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1. 发明专利

JPH09311364A CAMERA SHUTTER DEVICE 失效
公开(公告)号：JPH09311364A
公开(公告)日：1997-12-02
申请号：JP15008396
申请日：1996-05-21
申请人： COPAL CO LTD
发明人： TOMA KIYOSHI , SAKAMOTO TETSUO , INOUE NOBUYOSHI
IPC分类号： G03B7/097 , G03B9/70 , G03B17/02
摘要： PROBLEM TO BE SOLVED: To simplify an exposure control mechanism for a camera shutter device. SOLUTION: The camera shutter device is provided with an actuator 1, a sector 2, a power supply circuit 3, a photometry circuit 4 and a control circuit 5. The actuator 1 is reciprocatively rotated when a power is supplied, and also, the rotating state is changed in accordance with the supplied power quantity. The sector 2 is opened/closed interlocking with the actuator 1 so as to perform an exposure operation of the camera. The variable power is supplied by the power supply circuit 3 to the actuator 1 so as to change the rotating state of the actuator 1, then, the operating state of the sector 2 interlocking with the actuator 1 can be controlled and the exposure amount can be adjusted. Prior to the exposure operation, information on the luminance of an object is fetched by the photometry circuit 4. The power supply quantity supplied from the power supply circuit 3 to the actuator 1 is changed by the control circuit 5 in accordance with the luminance information, then, the exposure quantity is controlled so as to become suitable for the object.

2. 发明专利

JPH05296786A 失效
公开(公告)号：JPH05296786A
公开(公告)日：1993-11-09
申请号：JP33802092
申请日：1992-11-25
申请人： COPAL CO LTD
发明人： SAKAMOTO TETSUO , KUROSU TOMIO , MATSUMOTO JUNICHI
IPC分类号： G01B11/00 , G01B21/00 , G01D3/00 , G03B9/02 , G03B9/24
摘要： PURPOSE:To prevent a solid state difference and a secular change in a sensor means as well as a variation from being affected, in a position detector which detects a position in a way of comparing a detection level with a threshold level. CONSTITUTION:In conformity with an operational state of a detected member 10, a sensor means 15 is converted into an operational state, a nonoperational state and a second operational state in order, and a detection level of the sensor means 15 is compared with a threshold level, thereby detecting such a timing that this sensor means 15 varies from the nonoperational state to the second operational state. The detection level at the time of the first operational state of the sensor means 15 is stored in a capacitor 22, and this level is subjected to partial pressure by, for example, two resistors 26 and 27 and set down to a threshold level, so that when a solid state difference in the sensor means 15 and any power variation are produced, this threshold level is automatically corrected, thus the solid state difference in the sensor means 15 and the power variation are made so as not to be affected in consequence.

3. 发明专利

JPH04289799A CONSTANT CURRENT DRIVING CIRCUIT FOR STEP MOTOR 失效
公开(公告)号：JPH04289799A
公开(公告)日：1992-10-14
申请号：JP7686691
申请日：1991-03-16
申请人： COPAL CO LTD
发明人： KONO TAKANORI , SAKAMOTO TETSUO
IPC分类号： H02P8/12 , H02P8/00
摘要： PURPOSE:To suppress torque fluctuation due to voltage fluctuation in a constant current driving circuit for step motor which relies on a power supply subjected to voltage fluctuation such as a dry cell. CONSTITUTION:Driving current flowing through a load L is detected through a resistor 5 and fed back to an operational amplifier 3 so that the voltage induced across the resistor 5 by the driving current follows up the command voltage of the operational amplifier 3. The command voltage is applied from a charging current 16 which repeats charge/discharge in synchronism with a pulse control signal and the charging characteristics thereof are set such that the charging curve approximates to the rising waveform of driving current. Since the charging curve of the charging circuit 16 functions as a limiter for the rising waveform of driving current, torque fluctuation due to fluctuation of power supply voltage can be suppressed by setting the charging curve of the charging circuit 16 appropriately.

4. 发明专利

JPH0198904A POSITION DETECTING DEVICE 失效
公开(公告)号：JPH0198904A
公开(公告)日：1989-04-17
申请号：JP25660987
申请日：1987-10-12
申请人： COPAL CO LTD
发明人： SAKAMOTO TETSUO , KONO TAKANORI , UDAGAWA MASATAKA , KUROSU TOMIO
IPC分类号： G01B11/00
摘要： PURPOSE:To stabilize a light reception level in the operation of a movable member even if a source voltage varies by opening the optical path from a light emission part to a light reception part before the movable member begins to operate, and increasing the driving current of the light emission part so that the light reception level is a stationary level. CONSTITUTION:The optical path from the light emitting diode 2a of the projection part to the phototransistor 2b of the photodetection part is opened and closed with a slit provided associatively to the shutter blade 1 of the movable member and a signal level V1 obtained by the photodetection part is compared with a reference level V0 to detect the position of the blade 1 with the obtained pulse. At this time, the optical path from the light emission part to the light reception part is normally opened with the blade 1 and the voltage V1 generated by a resistance 3 is applied to the opposite-phase input of a comparator 4. Further, the reference voltage V0 generated by a resistance 6 is applied to the in-phase input of the comparator 4 by a constant current source 5. Then, those are compared to increase the driving current i0 of the diode 2a until the voltage V1 exceeds the voltage V0, and the current i0 is fixed at the point of time when the voltage V1 exceeds the V0.

5. 发明专利

JPH09325381A DRIVING DEVICE FOR CAMERA 失效
公开(公告)号：JPH09325381A
公开(公告)日：1997-12-16
申请号：JP16078996
申请日：1996-05-31
申请人： COPAL CO LTD
发明人： TOMA KIYOSHI , SAKAMOTO TETSUO
IPC分类号： G03B9/02
摘要： PROBLEM TO BE SOLVED: To simplify the driving circuit of a pulse motor so as to reduce consumption power in a driving device for a camera. SOLUTION: This driving device for the camera is provided with a base plate having an aperture part, a stop blade movably arranged with respect to the aperture part, the pulse motor arranged in the periphery of the aperture part and driving the stop blade, and the driving circuit 21 energizing pulse to the pulse motor. The pulse motor is constituted of a rotor 6 constituted of a permanent magnet magnetized to more than four poles, a pair of iron cores 9 arranged to the right and the left of a straight line passing the aperture part and the rotor 6 and respectively provided with a single pole opposed to the peripheral surface of the rotor 6, and a pair of coils 10 respectively wound to the pair of iron cores 9. The circuit 21 has a one-system output terminal provided in common to the pair of coils 10, energizes the pulse to only one coil 10 in the case the output terminal is switched to rotate and drive the rotor 6 in a forward direction, and energizes the pulse to only the other coil 10 in the case of rotating and driving the rotor 6 in a reverse direction. Since the output terminal of the circuit 21 is switched to the pair of the coils 10, a switch 23 is provided.

6. 发明专利

JPH07270851A TEMPERATURE CORRECTING DEVICE FOR CAMERA 失效
公开(公告)号：JPH07270851A
公开(公告)日：1995-10-20
申请号：JP8223494
申请日：1994-03-29
申请人： COPAL CO LTD
发明人： SAKAMOTO TETSUO
IPC分类号： G03B7/22 , G03B17/00
摘要： PURPOSE:To use the same temperature data in the case of consecutive photographic frames when the characteristic of a temperature depending device in a camera is corrected based on temperature data inputted from a temperature detection means. CONSTITUTION:The temperature data inputted from a temperature sensor 3 is stored in a temperature memory 6 and the correction data is read out from a correction data table 8 based on the temperature data to perform the temperature correction of the temperature depending device 1. A timer 4 is restarted every time photographing is finished, and the temperature data in the memory 6 is updated to the temperature data newly inputted from the sensor 3 in the case of next photographing on the condition that the time is up in the timer 4. Therefore, as long as photographing is kept being performed before the time is up in the timer 4, the temperature correction is performed based on the same temperature data, and a failure that the temperature correction is performed based on the temperature data different by every frame is eliminated.

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