System for exposure measurement and/or focus detection by means of image sensor
First Claim
Patent Images
1. An exposure measurement system comprising;
- a plurality of photoelectric converting elements each for converting a portion of a light beam into an electrical signal corresponding to a portion of the light beam,scanning means electrically coupled with said elements for sensing the outputs of the elements one after another,digital converting means coupled to said scanning means for converting the sensed outputs of the photoelectric converting elements into digital signals,a processing device coupled to said digital converting means for processing the output of the photoelectric converting elements converted into digital values by means of the digital converting means in accordance with a predetermined estimation function so as to determine an exposure value.[...]. .Iadd.andcontrol means for controlling the processing operation of said processing device, said control means being operable for causing the processing device to select optional elements whose outputs are to be utilized for the determination of the exposure value. .Iaddend.
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Abstract
The present invention relates to a system for exposure measurement and/or focus detection by means of image senser such as photo diode array (MOS image senser), CCD (charge coupled devices) consisting of a plural number of adjacently disposed respectively integrated fine light sensing elements whereby the image pattern of the object is scanned purely electrically in such a manner that the then obtained output of each light sensing element is converted into a digital value one after another for processing.
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Citations
44 Claims
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1. An exposure measurement system comprising;
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a plurality of photoelectric converting elements each for converting a portion of a light beam into an electrical signal corresponding to a portion of the light beam, scanning means electrically coupled with said elements for sensing the outputs of the elements one after another, digital converting means coupled to said scanning means for converting the sensed outputs of the photoelectric converting elements into digital signals, a processing device coupled to said digital converting means for processing the output of the photoelectric converting elements converted into digital values by means of the digital converting means in accordance with a predetermined estimation function so as to determine an exposure value.[...]. .Iadd.and control means for controlling the processing operation of said processing device, said control means being operable for causing the processing device to select optional elements whose outputs are to be utilized for the determination of the exposure value. .Iaddend. - View Dependent Claims (2, 3, 4)
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5. An exposure measurement system in accordance with claim .[.5.]. .Iadd.4.Iaddend., further comprising:
switch means for actuating at least one of said first addition and division circuits and second addition and division circuits, said switch means being electrically coupled to the first addition and division circuits and second addition and division circuits.
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6. An exposure control system comprising
a plurality of photoelectric converting elements each for converting a portion of a light beam into an electrical signal corresponding to a portion of the light beam. scanning means electrically coupled with said elements for sensing the outputs of the elements one after another, digital converting means coupled to said scanning means for converting the sensed outputs of the photoelectric converting elements into digital signals, .Iadd. control means for controlling the processing operation of said processing device, said control means being operable for causing the processing device to select optional elements whose outputs are to be utilized for the determination of the exposure value, and .Iaddend. a processing device coupled to said digital converting means for processing the output of the photoelectric converting elements converted into digital values by means of the digital converting means in accordance with a predetermined estimation function so as to determine an exposure value, and exposure adjusting means electrically coupled to the processing device for adjusting the exposure value on the basis of the exposure measurement information produced by the processing device.
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7. An exposure measurement system for a camera comprising;
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photoelectric converting means for converting light beam into electrical signals, said means being arranged in the path of the light beam coming from a photographic scene to be photographed by the camera and comprising a number of photoelectric converting elements for producing the electrical outputs corresponding to the brightness of the photographic scene, series detecting means for sequentially sensing the outputs of the photoelectric converting elements, said means being electrically coupled to the photoelectric converting means and sensing the outputs of the photoelectric converting elements in sequence and transmitting the outputs of the photoelectric converting elements one by one, digital converting means for successively converting the successive outputs of the detecting means into digital values, said means being electrically coupled to the output terminal of the photoelectric converting means, a processing device for determining the exposure value by processing the outputs converted into digital values by means of the digital converting means in accordance with a predetermined estimation function, so as to determine the exposure value, said device comprising; addition means for summing a plurality of the outputs of the photoelectric converting elements converted into digital values of the photoelectric converting elements, said means being electrically coupled to the digital converting means, division means for dividing the value obtained from the addition means by the number of the elements whose outputs have been summed by the addition means, said means being electrically coupled to the addition means, processing means for processing the exposure value on the basis of the value obtained from the dividing means, said means being electrically coupled to the dividing means.
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8. A camera capable of an exposure measurement by converting the light beam coming from the photographic scene through a photo-taking optical system into electrical signals comprising;
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image sensing means including a number of the photoelectric converting elements, said means being arranged in the path of the light beam coming through the photo-taking optical system and producing outputs corresponding to the brightness of the photographic scene, time series means for producing a time series of the outputs of the photoelectric converting elements, said series means being electrically coupled to the image sensing means and producing a time series of the outputs of the photoelectric converting elements by transmitting the outputs of the photoelectric converting elements one by one, digital converting means for successively converting the time series of the outputs of the photoelectric converting elements produced by means of the time series means into digital values, said means being electrically coupled to the image sensing means, a processing device for determining the exposure value by processing the outputs converted into digital values by means of the digital converting means in accordance with a predetermined estimation function so as to determine the exposure value, said device being electrically coupled to the digital converting means.[...]. .Iadd., and control means for controlling the processing operation of said processing device, said control means being operable for causing the processing device to select optional elements whose outputs are to be utilized for the determination of the exposure value. .Iaddend. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A system comprising;
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an image forming optical system, at least a part of said optical system being movable along an optical axis so as to form an image of an object at a predetermined position, photoelectric converting means for converting a light beam into electrical signals, said converting means being arranged at the predetermined position and comprising a number of photoelectric converting elements each producing an electrical output corresponding to a portion of the light beam, time series means coupled to the elements for producing a time series of the outputs of the photoelectric converting elements, said series means being electrically connected with the photoelectric converting elements and .[.making.]. .Iadd.forming .Iaddend.the time series of the outputs of the photoelectric converting elements by successively transmitting the outputs of the photoelectric converting elements, digital converting means coupled to the photoelectric converting means for successively converting the time series outputs of the photoelectric converting elements into digital values, a processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means in accordance with a predetermined estimation function so as to detect the focusing condition of the image forming optical system, said device being electrically coupled to the digital converting means so as to produce focusing information of the optical system by processing the outputs of the photoelectric converting elements converted into digital values in accordance with the predetermined estimation function. - View Dependent Claims (15, 16)
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17. A camera comprising:
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a photo-taking optical system, at least a part of said system being movable along an optical axis so as to form an image of the object to be photographed at a predetermined position, image sensing means including a number of photoelectric converting elements arranged on a same plane, said sensing means being arranged at a position optically equivalent to the predetermined position and each element in said means producing an electrical output corresponding to a portion of a light beam coming through said optical system, time series means for producing a time series of the outputs of the photoelectric converting elements, said time series means being electrically coupled to the image sensing means and producing the time series of the outputs by successively transmitting the outputs of the photoelectric converting means, digital converting means for successively converting the time series outputs of the photoelectric converting elements, into digital values, said converting means being electrically coupled to the image sensing means, a processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of digital converting means in accordance with a predetermined estimation function so as to detect the focusing condition of the optical system, said device being electrically coupled to the digital converting means so as to produce focusing information by processing the outputs of the photoelectric converting elements converted into digital values in accordance with the predetermined estimation function. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A system capable of both exposure measurement and detection of focusing condition of an image forming optical system settable along an optical axis to form an image of an object at a predetermined position, comprising
photoelectric converting means for converting a light beam into electrical signals, said converting means being arranged at the predetermined position, and including a number of photoelectric converting elements producing electric outputs corresponding to the light beam, time series producing means coupled to said converting elements for producing a time series of the outputs of the photoelectric converting elements by successively transmitting the outputs of the photoelectric converting elements, digital converting means for successively converting the time series outputs of the photoelectric converting elements produced by the time series means into digital values, said converting means being electrically connected with the photoelectric converting means, a first processing device for processing the outputs of the photoelectric converting elements converted into digital values in accordance with a first predetermined estimation function so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means, a second processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means on the basis of a second predetermined estimation function, so as to determine an exposure value, said second processing device being electrically connected with the digital converting means.
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26. A system for exposure measurement and focus adjustment of an image forming optical system settable along an optical axis to form an image of an object at a predetermined position, comprising
photoelectric converting means for converting a light beam into electrical signals, said converting means being arranged at the predetermined position, and including a number of photoelectric converting elements producing electric outputs corresponding to the light beam, time series producing means coupled to said converting elements for producing a time series of the outputs of the photoelectric converting elements by successively transmitting the outputs of the photoelectric converting elements, digital converting means for successively converting the time series output of the photoelectric converting elements produced by the time series means into digital values, said converting means being electrically connected with the photoelectric converting means, a first processing device for processing the outputs of the photographic converting elements converted into digital values in accordance with a first predetermined estimation function so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means, a second processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means on the basis of a second predetermined estimation function, so as to determine an exposure value, said second processing device being electrically connected with the digital converting means, and adjusting means for adjusting the image forming optical system in accordance with the output of the first processing device, so that the image of the object may be formed at the predetermined position, said means being functionally engaged with the image forming optical system and electrically connected with the first processing device.
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27. A system for exposure control and detection of focusing condition of an image forming optical system setting along an optical axis to form an image of an object at a predetermined position, comprising
photoelectric converting means for converting a light beam into electrical signals, said converting means being arranged at the predetermined position, and including a number of photoelectric converting elements producing electric outputs corresponding to the light beam, time series producing means coupled to said converting elements for producing a time series of the outputs of the photoelectric converting elements by successively transmitting the outputs of the photoelectric converting elements, digital converting means for successively converting the time series outputs of the photoelectric converting elements produced by the time series means into digital values, said converting means being electrically connected with the photoelectric converting means, a first processing device for processing the outputs of the photoelectric converting elements converted into digital values in accordance with a first predetermined estimation function so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means, a second processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means on the basis of a second predetermined estimation function, so as to determine an exposure value, said second processing device being electrically connected with the digital converting means, and exposure adjusting means for adjusting the exposure value on the basis of the exposure measurement information produced by the second processing device, said means being electrically connected with the second processing devices.
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28. A camera capable of both exposure measurement and focus point detection of a photo-taking optical system settable along an optical axis so as to form an image of an object at a predetermined position comprising;
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image sensing means having a number of photoelectric converting elements arranged a same plane, said sensing means being arranged at a position optically equivalent to the predetermined position and each element in said means producing an electrical output corresponding to a portion of a light beam coming through the optical system from the object, time series means for producing a time series of the outputs of the photoelectric converting elements said means being electrically connected with the image sensing means and producing the time series of the photoelectric converting elements by successively delivering the outputs of the photoelectric converting elements, digital converting means for successively converting the time series outputs of the photoelectric converting elements produced by the time series means into digital values, said means being electrically connected with the image sensing means, a first processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means, in accordance with a first predetermined estimation function, so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means and producing focusing detection information of the optical system by processing the outputs of the elements converted into digital values in accordance with the first estimation function, a second processing device for processing the outputs of the photoelectric converting elements converted into digital values by means of the digital converting means in accordance with a second predetermined estimation function, so as to determine the exposure value, said device being electrically connected with the digital converting means and producing the exposure measurement information by processing the outputs of the elements converted into digital values in accordance with the second estimation function. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. A system capable of .[.either.]. exposure measurement .[.or the.]. .Iadd.and .Iaddend.detection of focusing condition of an optical system comprising;
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a plurality of photoelectric converting elements for converting light beam into electrical signals, each photoelectric converting element producing an electrical output corresponding to a portion of the light beam, .[.sequential sensing.]. .Iadd.time series output .Iaddend.means for successively transmitting the outputs of successive ones of the photoelectric converting elements, said .[.sensing.]. .Iadd.time series output .Iaddend.means being electrically connected with the photoelectric converting elements, digital converting means for converting the outputs successively transmitted by means of the .[.sensing.]. .Iadd.time series output .Iaddend.means, of the photoelectric converting elements into digital values, a processing device for processing the outputs of the photoelectric converting elements converted in digital values by means of the digital converting means .[.either.]. in accordance with a first predetermined estimation function so as to determine a exposure value, .[.or.]. .Iadd.and .Iaddend.in accordance with the predetermined second estimation function so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means in such a manner that .[.either.]. exposure measurement information .[.or.]. .Iadd.and .Iaddend.focusing condition information .[.is.]. .Iadd.are .Iaddend.produced by processing the outputs of the photoelectric converting elements converted into digital value in accordance with .[.either of.]. the estimation functions .Iadd.control means for controlling the processing device to operate for either focus detection or exposure measurement.Iaddend..
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36. A system capable of either exposure measurement or detection of focusing condition of an image forming optical system at least one part of which is movable along an optical axis so as to form an image of an object at a predetermined position, comprising
photoelectric converting means for converting light beam into electrical signals, said means being arranged at the predetermined position and including a plurality of photoelectric converting elements, each element producing an output corresponding to a portion of the input light beam, time series means for making a time series of the outputs of the photoelectric converting elements, said means being electrically connected with the photoelectric means, so as to make the time series of the outputs of the photoelectric converting elements by successively delivering the outputs of the elements one by one, digital converting means for successively converting the time series outputs, of the photoelectric elements into digital values, said means being electrically connected with an output terminal of the photoelectric converting means, a processing device for processing the outputs of the photoelectric converting elements converted in digital values by means of the digital converting means either in accordance with a first predetermined estimation function, so as to determine the exposure value or in accordance with a second predetermined estimation function, so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means in such a manner that either the exposure measurement information or information relating with the focusing condition is produced by processing the outputs of the photoelectric converting elements converted into digital values, of the photoelectric converting elements in accordance with either of the estimation functions.[...]..Iadd., and control means for controlling said processing device, said control means causing the processing device to operate for either the focus detection or exposure measurement. .Iaddend.
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37. A camera capable of .[.either.]. exposure measurement .].or.]. .Iadd.and .Iaddend.detection of focusing condition of image forming optical system by converting the light beam into electrical signal comprising:
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image sensing means including a plurality of photoelectric converting elements arranged on the same plane, said means being arranged at a position, at which light coming through the optical system can be caught, each photoelectric converting elements producing an output corresponding to a portion of the light, time series means for successively delivering the outputs of the photoelectric converting elements, said means being electrically connected with the image sensing means, digital converting means for successively converting the outputs successively delivered by means of the time series means, of the photoelectric converting elements into digital values, said means being electrically connected with an output terminal of the image sensing means, a processing device for processing the outputs converted in digital value by means of the digital converting means, of the photoelectric converting elements .[.either.]. in accordance with a first predetermined estimation function, so as to determine the exposure value .[.or.]. .Iadd.and .Iaddend.in accordance with a second predetermined estimation function, so as to detect the focusing condition of the optical system, said device being electrically connected with the digital converting means, receiving the outputs converted into digital values, of the photoelectric converting elements and producing .[.either.]. exposure measurement information .[.or the estimation functions .Iadd.and .Iaddend.information relating with the focusing condition of the photographic optical system by processing the outputs in accordance with .[.either of.]. the estimation functions .Iadd.and control means for controlling the processing device to operate for either focus detection or exposure measurement.Iaddend..
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39. formed by the optical system in a digital word. .Iaddend..Iadd. 64. In a focusing system, a focus detecting device comprising:
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(A) sensing means having a plurality of radiation sensitive elements, each providing an electrical signal corresponding to radiation incident thereon, said sensing means being disposed at a position corresponding to at least near a predetermined focal plane on which an image of an object is to be focused, so as to receive radiation distribution which changes with the change in the focusing condition of the focusing system; (B) means for causing said sensing means to provide as an output indicative of said radiation distribution the electrical signals of the respective elements in a time seriated manner; (C) means for detecting, on the basis of the output of said sensing means, correlation of radiation distribution between each of two close positions in said focal plane, said correlation detecting means providing electrical signals indicative of the correlations; and (D) means receiving the electrical signals from said correlation detecting means and providing a resultant output indicative of the focusing - View Dependent Claims (38)
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40. condition of the focusing system. .Iaddend..Iadd. 65. A focus detecting device according to claim 64, wherein said correlation detecting means provides each electrical signal indicative of each correlation in a digital word. .Iaddend..Iadd. 66. A focus detecting device according to claim 65, wherein said correlation detecting means provides the electrical signals in a time-seriated manner. .Iaddend..Iadd. 67. A focus detecting device according to one of claims 64 to 66, wherein said resultant output providing means provides the resultant output in a digital word. .Iaddend..Iadd. 68. An exposure measurement system comprising:
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(A) light sensing means including a plurality of sensing elements, each for receiving a portion of a light and for providing an electrical signal corresponding to said portion of the light; (B) time seriation means for causing said sensing means to provide as an output thereof the electrical signals of the respective sensing elements in a time-seriated manner; and (C) processing means receiving the time-seriated output of said sensing means and processing at most all the electrical signals of said sensing elements to determine an exposure value; and (D) control means for controlling the signal processing operation of said processing means, said control means being operable for causing the processing means to select optional elements whose electrical signals are to be processed for the determination of the exposure value.
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41. Iaddend..Iadd. 69. An exposure measurement system according to claim 68, wherein said processing means determines the exposure value on the basis of the output of said sensing means and one or more other exposure factors. .Iaddend..Iadd. 70. An exposure measurement system according to claims 68 or 69, wherein said processing means provides a resultant output indicative of the determined exposure value in a digital word. .Iaddend..Iadd. 71. A system for exposure measurement and detection of focusing condition of an image forming optical system onto an object, comprising:
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(A) sensing means including a plurality of sensing elements, each providing an electrical signal corresponding to a portion of a light incident thereon, said sensing means being arranged to receive an image of the object formed by said optical system; (B) time seriation means for causing said sensing means to provide as an output thereof the electrical signals of the respective sensing elements in a time-seriated manner; (C) first processing means receiving the time-seriated output of said sensing means and processing said output to detect the focusing condition of the optical system onto the object; (D) second processing means receiving the time-seriated output of said sensing means and processing said output to determine an exposure value; and (E) sequence control means for controlling operations of said time seriation means and said first and second processing means, said sequence control means firstly causing said time seriation means and one of said first and second processing means to operate for one of said focus detection and exposure determination and after the termination of said one of focus detection and exposure determination causing the time seriation means and the other of said first and second processing means to operate for the other of said focus detection and exposure determination. .Iadd.
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42. A system according to claim 71, wherein said sequence control means firstly causes said first processing means to operate for the focus detection and after the termination of the focus detection by the first processing means causes said second processing device to operate for the exposure determination. .Iaddend. .Iadd. 73. A system according to claim 71, wherein said first processing means provides a resultant output indicative of the focusing condition of the optical system in a digital word. .Iaddend..Iadd. 74. A system according to claim 71 or 73, wherein said processing means provides a resultant output indicative of the determined exposure value in a digital word. .Iaddend..Iadd. 75. A system for exposure measurement and detection of focusing condition of an image forming optical system onto an object, comprising:
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(A) sensing means including a plurality of sensing elements, each providing an electrical signal corresponding to a portion of a light incident thereon, said sensing means being arranged to receive an image of the object formed by said optical system; (B) time seriation means for causing said sensing means to provide an output thereof the electrical signals of the respective sensing elements in a time-seriated manner; (C) processing means receiving the output of said sensing means and processing said output for focus detection and for exposure determination, said processing means being selectively operable in a first operation mode for detection of the focusing condition of the optical system on the basis of said output and in a second operation mode for determining an exposure value on the basis of said output; and (D) sequence control means for controlling operations of said time seriation means and said processing means, said sequence control means firstly causing the time seriation means to operate and the processing means to operate in one of said first and second operation modes for one of said focus detection and exposure determination and after the termination of said one of the focus detection and exposure determination causing again the time seriation means to operate and the processing means to operate in the other of said first and second operation modes for the other of said focus detection and exposure determination. .Iaddend..Iadd.
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43. 6. A system according to claim 75, wherein said sequence control means firstly causes said processing means to operate in said first operation mode for the focus detection and after the termination of the focus detection causes the processing means to operate in said second operation mode for the exposure determination. .Iaddend..Iadd. 77. A system according to claim 75 or 76, wherein said processing means provides a first output indicative of the focusing condition of the optical system and a second output indicative of the determined exposure value in digital words. .Iaddend..Iadd. 78. A system capable of either of exposure measurement or detection of focusing condition of an image forming optical system onto an object, comprising:
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(A) sensing means including a plurality of sensing elements, each providing an electrical signal corresponding to a portion of a light incident thereon, said sensing means being arranged to receive an image of the object formed by said optical system; (B) time seriation means for causing said sensing means to provide as an output thereof the electrical signals of the respective sensing elements in a time-seriated manner; (C) processing means receiving the output of said sensing means and processing said output for either of detecting focusing condition of the optical system or determining an exposure value, said processing means providing focusing condition information or exposure value information on the basis of the output of the sensing means; and (D) control means for controlling said time seriation means and said processing means, said control means causing the time seriation means and the processing means to operate for either of the focus detection or
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44. exposure determination. .Iaddend..Iadd. 79. A system according to claim 78, wherein said processing means provides said focusing condition information or exposure value information in a digital word. .Iaddend. .Iadd. 80. In a focusing system, a focus detecting device comprising:
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(A) sensing means having a plurality of radiation sensitive elements, each providing an electrical signal corresponding to radiation incident thereon, said sensing means being disposed at a position corresponding to at least near a predetermined focal plane on which an image of an object is to be focused, so as to receive radiation distribution which changes with the change in the focusing condition of the focusing system; (B) means for causing said sensing means to provide as an output indicative of said radiation distribution the electrical signals of the respective elements in a time seriated manner; (C) means for detecting, on the basis of the output of said sensing means, correlation of radiation distribution between each of two close positions in said focal plane, said correlation detecting means providing electrical signals indicative of the correlation; and (D) means receiving the electrical signal from said correlation detecting means and providing a resulting output indicative of the focusing condition of the focusing system by accumulating correlation information on the basis of the output signals of said correlation detecting means. .Iaddend.
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Specification