Camera system capable of focus detection through an interchangeable objective lens
First Claim
1. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body and an interchangeable objective lens selectively attachable to the camera body comprising:
- an opening, located in the camera body for detachably connecting with the interchangeable objective lens;
means, located in the camera body, for receiving light through the opening to produce electric signals;
means, located in the camera body, for processing the electric signals to generate a defocusing information indicative of defocusing degree and defocusing direction relative to an ideal focal plane;
means, located in the camera body, for generating a driving power for automatic focus control, including a first movable member;
means, located in the camera body, for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a converting information necessary to convert the defocusing degree of the defocusing information into a degree of movement of the first movable member;
means, located in the camera body, for calculating the degree of movement of the first movable member in response to the defocusing degree of the defocusing information and the converting information;
means, located in the camera body, for controlling the generating means to move the first movable member in response to the defocusing direction of the defocusing information and the calculated degree of movement;
means, located in the camera body, for transmitting the driving power of the generating means to the interchangeable objective lens, the transmitting means including a second movable member connectable with the interchangeable objective lens and responsive to the movement of the first movable member;
an optical system, located in the interchangeable objective lens, for forming an image of an object;
means, located in the interchangeable objective lens, for adjusting the focus of the optical system, the adjusting means including a third movable member connectable with the second movable member for a coupled movement therewith;
a read only memory, located in the objective lens, for storing various digital data at a plurality of addresses, the stored digital data including the converting information;
means, located in the interchangeable objective lens, for selectively designating one of the addresses of the read only memory; and
means for sending digital data stored in the designated address to the accepting means,wherein the converting information is formed as a digital data composed of n-bit of significant digits part and n-bit of floating point coefficient part.
1 Assignment
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Accused Products
Abstract
A camera system with an auto-focusing system includes a camera body and an interchangeable zoom lens. The interchangeable objective lens stores various data to be sent to the camera body for improving automatic focus adjustment, such as an information necessary to convert the detected defocus information into a movement of the driving power source to carry out the automatic focus adjustment. The driving power source in the camera body is controlled in response to the data from the interchangeable objective lens and the detected focus information, the driving power being transmitted to the interchangeable objective lens. The camera body is further capable of inhibiting the focus adjustment or focus indication in response to a data from the interchangeable objective lens under an unfavorable condition.
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Citations
30 Claims
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1. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body and an interchangeable objective lens selectively attachable to the camera body comprising:
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an opening, located in the camera body for detachably connecting with the interchangeable objective lens; means, located in the camera body, for receiving light through the opening to produce electric signals; means, located in the camera body, for processing the electric signals to generate a defocusing information indicative of defocusing degree and defocusing direction relative to an ideal focal plane; means, located in the camera body, for generating a driving power for automatic focus control, including a first movable member; means, located in the camera body, for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a converting information necessary to convert the defocusing degree of the defocusing information into a degree of movement of the first movable member; means, located in the camera body, for calculating the degree of movement of the first movable member in response to the defocusing degree of the defocusing information and the converting information; means, located in the camera body, for controlling the generating means to move the first movable member in response to the defocusing direction of the defocusing information and the calculated degree of movement; means, located in the camera body, for transmitting the driving power of the generating means to the interchangeable objective lens, the transmitting means including a second movable member connectable with the interchangeable objective lens and responsive to the movement of the first movable member; an optical system, located in the interchangeable objective lens, for forming an image of an object; means, located in the interchangeable objective lens, for adjusting the focus of the optical system, the adjusting means including a third movable member connectable with the second movable member for a coupled movement therewith; a read only memory, located in the objective lens, for storing various digital data at a plurality of addresses, the stored digital data including the converting information; means, located in the interchangeable objective lens, for selectively designating one of the addresses of the read only memory; and means for sending digital data stored in the designated address to the accepting means, wherein the converting information is formed as a digital data composed of n-bit of significant digits part and n-bit of floating point coefficient part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member under a control of the camera body; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a converting information necessary for the camera body to control the movable member in accordance with a result of the focus detection; means for selectively designating one of the addresses of the read only memory; and means for sending data stored in the designated address to the camera body, wherein the converting information is formed as a digital data composed of m-bit of significant digits part and n-bit of floating point coefficient part. - View Dependent Claims (12)
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13. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member under a control of the camera body; means for varying the focal length of the optical system; means for classifying the focal length actually determined by the varying means into one of a plurality of prepared focal length zones to indicate a specific focal length zone to which the determined focal length belongs; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including, in a plurality of respective addresses, a plurality of converting informations necessary for the camera body to control the movable member in accordance with a result of the focus detection, the plurality of converting informations corresponding to the plurality of focal length zones so that each of the converting informations is representative of focal lengths in each focal length zone with a value of causing an approximately minimum degree of movement of the movable member within each focal length zone; means for selectively designating one of the addresses of the read only memory corresponding to the indicated focal length zone in response to the classifying means; and means for sending data stored in the designated address to the camera body. - View Dependent Claims (14)
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15. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member connectable with the camera body to receive a driving power of adjusting focus from the camera body; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a converting information for converting a defocusing degree of the optical system into the degree of movement of the movable member; means for selectively designating one of the addresses of the read only memory; and means for sending data stored in the designated address to the camera body. - View Dependent Claims (16)
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17. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body connectable with an interchangeable objective lens, comprising:
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an opening for detachably connecting with the interchangeable objective lens; means for receiving light through the opening to produce electric signals; means for processing the electric signals to generate a defocusing information indicative of defocusing degree and defocusing direction relative to an ideal focal plane; means for generating a driving power for automatic focus control, including a first movable member; means for transmitting the driving power of the generating means to the interchangeable objective lens, the transmitting means including a second movable member connectable with the interchangeable objective lens and responsive to the movement of the first movable member; means for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a converting information for converting the defocusing degree of the defocusing information into a degree of movement of the second movable member; means for providing a supplemental converting data to convert the degree of movement of the second movable member into that of the first movable member; means for calculating the degree of movement of the first movable member in response to the defocusing degree of the defocusing information, the converting information and the supplemental converting information; and means for controlling the generating means to move the first movable member in response to the defocusing direction of the defocusing information and the calculated degree of movement.
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18. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising;
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member connectable with the camera body to receive a driving power of adjusting focus from the camera body; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a converting information necessary for the camera body to control the movable member in accordance with a result of the focusing detection, and a direction information necessary for the camera body to determine the direction to drive the movable member in accordance with a result of the focusing detection; means for selectively designating one of the addresses of the read only memory; and means for sending data stored in the designated address to the camera body. - View Dependent Claims (19)
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20. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body connectable with an interchangeable objective lens, comprising:
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an opening for detachably connecting with the interchangeable objective lens; means for receiving light through the opening to produce electric signals; means for processing the electric signals to generate a defocusing information indicative of defocusing degree and defocusing direction relative to an ideal focal plane; means for generating a driving power for automatic focus control, including a first movable member; means for transmitting the driving power of the generating means to the interchangeable objective lens, the transmitting means including a second movable member connectable with the interchangeable objective lens and responsive to the movement of the first movable member; means for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a converting information necessary to convert the defocusing degree of the defocusing information into a degree of movement of the first movable member, and a direction information indicative of the relation between the defocusing direction and the direction of the movement of the first movable member; means for calculating the degree of movement of the first movable member in response to the defocusing degree of the defocusing information and the converting information; means for determining the direction of movement of the first movable member in response to the defocusing direction of the defocusing information and the direction information; and means for controlling the generating means to move the first movable member in response to the calculating means and the determining means.
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21. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body connectable with an interchangeable objective lens, comprising:
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an opening for detachably connecting with the interchangeable objective lens; means for receiving light through the opening to produce electric signals, including a pair of photosensitive devices, the devices being each responsive to light coming through different two parts of exit pupil of the interchangeable objective lens; means for processing the electric signals to generate a defocusing information with respect to an ideal focal plane; means for accepting from the interchangeable objective lens an information of a fully open aperture size thereof; means for controlling the receiving means and the processing means to inform of the result of focus detection in response to the defocusing information; means for comparing the informed fully open aperture size of the interchangeable objective lens with a reference aperture size which is the minimum allowing the pair of photosensitive devices to properly respond to light coming through the respective two different parts of the exit pupil; and means for inhibiting the controlling means from informing of the result of focus detection when the informed fully open aperture size is less than the reference aperture size. - View Dependent Claims (22)
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23. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member under a control of the camera body; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a fully open aperture information indicative of a fully open aperture size of the optical system, and an auto-focus information indicating that the interchangeable objective lens has the movable member for automatic focus adjustment; means for selectively designating one of the addresses of the read only memory; and means for sending data stored in the designated address to the camera body. - View Dependent Claims (24)
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25. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a fully open aperture information indicative of a fully open aperture size of the optical system, and an auto-focus information indicating that the interchangeable objective lens has no means for automatically adjusting focus under the control of the camera body; means for selectively designating one of the addresses of the read only memory; and means for sending data stored in the designated address to the camera body. - View Dependent Claims (26)
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27. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, an interchangeable objective lens attachable to a camera body, comprising:
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an optical system for forming an image of an object; means for adjusting the focus of the optical system, the adjusting means including a movable member under a control of the camera body; means for bringing the optical system into a macro-photography condition; a read only memory for storing various digital data at a plurality of addresses, the stored digital data including a macro-photography information indicating that the interchangeable objective lens is in the macro-photography condition; means for selectively designating one of the addresses of the read only memory, the designating means being responsive to the bringing means for designating an address at which the marco-photography information is stored; and means for sending data stored in the designated addresses to the camera body. - View Dependent Claims (28)
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29. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body connectable with an interchangeable objective lens, comprising:
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an opening for detachably connecting with the interchangeable objective lens; means for receiving light through the opening to produce electric signals; means for processing the electric signals to generate a defocusing information with respect to an ideal focal plane; means for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a macro-photography information indicating that the interchangeable objective lens is in a macro-photography condition; means for controlling the receiving means and the processing means to inform of the result of focus detection in response to the defocusing information; means responsive to the controlling means for generating a control power to be transmitted to the interchangeable objective lens for automatic focus control; means responsive to the controlling means for indicating the focus condition; and means for governing the controlling means to inhibit the generating means from responding to the controlling means with the responsibility of the indicating means to the controlling means maintained, when the accepting means accepts the macro-photography information.
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30. In a camera system capable of focus detection by means of receiving light through an interchangeable objective lens, a camera body connectable with an interchangeable objective lens, comprising:
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an opening for detachably connecting with the interchangeable objective lens; means for receiving light through the opening to produce electric signals; means for processing the electric signals to generate a defocusing information with respect to an ideal focal plane; means for accepting digital data to be transmitted from the interchangeable objective lens, the digital data including a check data for certifying that the interchangeable objective lens is correctly connected to the camera body by means of successful acceptance of the check data by the accepting means; means for controlling the receiving means and the processing means to inform of the result of focus detection in response to the defocusing information; and means for inhibiting the controlling means from informing the result of focus detection when the accepting means fails to accept the check data.
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Specification