Exposure controlling device and encoder for camera
First Claim
1. An exposure controlling device of a camera having an aperture diaphragm, said exposure controlling device comprising:
- a motorized driving mechanism to open and close said aperture diaphragm;
an encoder for detecting an actuation of said motorized driving mechanism, said encoder comprising;
a sensor; and
a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said motorized driving mechanism, wherein said rotating disk has a first angular range in which an output signal from said sensor does not vary as said rotating disk rotates and a second angular range in which the output signal from said sensor varies in accordance with the rotation of said rotating disk, andwherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position;
a detent mechanism that positions said rotating disk at said initial position; and
a controlling unit that controls said motorized driving mechanism to drive said aperture diaphragm in accordance with signals received from said sensor.
1 Assignment
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Accused Products
Abstract
An exposure controlling device includes, an aperture diaphragm that is driven by a motorized driving mechanism to open and close, an encoder for detecting an actuation of the motorized driving mechanism comprising a photocoupler and a rotating disk mounted in connection with the photocoupler. The rotating disk rotates corresponding to the actuation of the motorized driving mechanism by less than one full turn, and the rotating disk has a first angular range where the output signal from the photocoupler does not vary even when the rotating disk rotates and a second angular range where the output signal from the photocoupler varies in cycles in accordance with the rotation of the rotating disk. A controlling unit is provided to control the motorized driving mechanism to drive the aperture diaphragm in accordance with signals received from the photocoupler. The photocoupler faces to the first angular range when the aperture diaphragm is set at an p redetermined initial position.
17 Citations
48 Claims
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1. An exposure controlling device of a camera having an aperture diaphragm, said exposure controlling device comprising:
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a motorized driving mechanism to open and close said aperture diaphragm; an encoder for detecting an actuation of said motorized driving mechanism, said encoder comprising; a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said motorized driving mechanism, wherein said rotating disk has a first angular range in which an output signal from said sensor does not vary as said rotating disk rotates and a second angular range in which the output signal from said sensor varies in accordance with the rotation of said rotating disk, and wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position; a detent mechanism that positions said rotating disk at said initial position; and a controlling unit that controls said motorized driving mechanism to drive said aperture diaphragm in accordance with signals received from said sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An exposure controlling device of a camera having an aperture diaphragm, said exposure controlling device comprising:
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a motorized driving mechanism to open and close said aperture diaphragm; an encoder for detecting an actuation of said motorized driving mechanism, said encoder comprising; a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said motorized driving mechanism, wherein said rotating disk has a first angular range in which an output signal from said sensor does not vary as said rotating disk rotates and a second angular range in which the output signal from said sensor varies in accordance with the rotation of said rotating disk, wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position; said second angular range is provided with a pattern that changes the output level of the signals from said sensor in constant cycles in accordance with rotation of said rotating disk; wherein said sensor comprises a photocoupler and said pattern comprises a light modulating pattern; said light modulating pattern is formed as a plurality of light reflecting parts arranged on a low reflectivity surface of said rotating disk, wherein said photocoupler comprises a photoreflecter to detect the reflected light from said light reflecting parts; and a controlling unit that controls said motorized driving mechanism to drive said aperture diaphragm in accordance with signals received from said sensor. - View Dependent Claims (9, 10, 11, 12, 13)
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14. An exposure controlling device of a camera having an aperture diaphragm, said exposure controlling device comprising:
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a motorized driving mechanism to open and close said aperture diaphragm; an encoder for detecting an actuation of said motorized driving mechanism, said encoder comprising; a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said motorized driving mechanism, wherein said rotating disk has a first angular range in which an output signal from said sensor does not vary as said rotating disk rotates and a second angular range in which the output signal from said sensor varies in accordance with the rotation of said rotating disk, and wherein said second angular range is provided with a pattern that changes the output level of signals from said sensor at variable intervals in accordance with rotation of said rotating disk, and said variable intervals of change gradually increase as the aperture area of said aperture diaphragm increases; wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position; and a controlling unit that controls said motorized driving mechanism to drive said aperture diaphragm in accordance with signals received from said sensor. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An encoder for a camera that detects an aperture area of an aperture diaphragm, said encoder comprising:
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a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said aperture diaphragm, said rotating disk having a first angular range where an output signal from said sensor does not vary as said rotating disk rotates and a second angular range where the output signal from said sensor varies in cycles in accordance with the rotation of said rotating disk; wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position, and a detent mechanism that positions said rotating disk at said initial position. - View Dependent Claims (26, 27)
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28. An encoder for a camera that detects an aperture area of an aperture diaphragm, said encoder comprising:
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a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said aperture diaphragm, said rotating disk having a first angular range where an output signal from said sensor does not vary as said rotating disk rotates and a second angular range where the output signal from said sensor varies in cycles in accordance with the rotation of said rotating disk; wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position, said sensor comprises a photocoupler and said second angular range is provided with a light modulating pattern that changes the output level of signals from said photocoupler, wherein said light modulating pattern is formed as a plurality of transparent parts arranged on an opaque surface of said rotating disk, and wherein said photocoupler comprises a photointerrupter to detect the transmitted light through said transparent parts, and said transparent parts are formed at variable angular intervals; and wherein said variable angular intervals of said transparent parts gradually increase as the aperture area of said aperture diaphragm increases. - View Dependent Claims (29, 30, 31, 32)
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33. An encoder for a camera that detects an aperture area of an aperture diaphragm, said encoder comprising:
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a sensor; and a rotating disk mounted in connection with said sensor, said rotating disk rotating by less than one revolution in correspondence with the actuation of said aperture diaphragm, said rotating disk having a first angular range where an output signal from said sensor does not vary as said rotating disk rotates and a second angular range where the output signal from said sensor varies in cycles in accordance with the rotation of said rotating disk; said sensor comprises a photocoupler and said second angular range is provided with a light modulating pattern that changes the output level of the signals from said photocoupler; wherein said sensor faces said first angular range when said aperture diaphragm is set at a predetermined initial position; and said light modulating pattern is formed as a plurality of light reflecting parts arranged on the a reflectivity surface of said rotating disk, and wherein said photocoupler comprises a photoreflecter to detect the reflected light from said light reflecting parts. - View Dependent Claims (34, 35, 36)
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37. An exposure controlling device of a camera having an aperture diaphragm, said device comprising:
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a motorized driving mechanism to open and close said aperture diaphragm; an encoder which detects an actuation of said motorized driving mechanism, said encoder comprising; a photocoupler; and a rotating disk mounted in connection with said photocoupler, said rotating disk rotating in correspondence with the actuation of said motorized driving mechanism, wherein said rotating disk has a plurality of light modulating parts such that an output signal from said photocoupler varies in cycles in accordance with the rotation of said rotating disk; wherein said light modulating parts are formed at constant intervals, said light modulating parts are formed as a plurality of light reflecting parts arranged on a low reflectivity surface of said rotating disk, and said photocoupler comprises a photoreflecter to detect the reflected light from said light reflecting parts; wherein variation of the output signal and the aperture area of said aperture diaphragm are directly related; and a controlling unit which controls said motorized driving mechanism to drive said aperture diaphragm in accordance with signals received from said photocoupler. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. An encoder for a camera that detects an aperture area of an aperture diaphragm, said encoder comprising:
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a photocoupler; and a rotating disk mounted in connection with said photocoupler, said rotating disk rotating in correspondence with the actuation of said aperture diaphragm, wherein said rotating disk has a plurality of light modulating parts such that an output signal from said photocoupler varies in cycles in accordance with the rotation of said rotating disk; wherein said light modulating parts are formed as a plurality of transparent parts arranged on the opaque surface of said rotating disk, and said photocoupler comprises a photointerrupter to detect the transmitted light through said transparent parts, wherein said transparent parts are formed at variable angular intervals, said variable angle intervals of said transparent parts gradually increase as the aperture area of said aperture diaphragm increases, and wherein each of said light modulating parts and the aperture area of said aperture diaphragm are directly related. - View Dependent Claims (46)
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47. An encoder for a camera that detects an aperture area of an aperture diaphragm, said encoder comprising:
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a photocoupler; and a rotating disk mounted in connection with said photocoupler, said rotating disk rotating in correspondence with the actuation of said aperture diaphragm, wherein said rotating disk has a plurality of light modulating parts such that an output signal from said photocoupler varies in cycles in accordance with the rotation of said rotating disk; said light modulating parts are formed as a plurality of light reflecting parts arranged on a low reflectivity surface of said rotating disk, said light reflecting parts are formed at variable angular intervals, and said photocoupler comprises a photoreflecter to detect the reflected light from said light reflecting parts; and wherein each of said light modulating parts and the aperture area of said aperture diaphragm are directly related. - View Dependent Claims (48)
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Specification