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公开(公告)号：JPS63282622A
公开(公告)日：1988-11-18
申请号：JP31694887
申请日：1987-12-15
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , KAWAGOE NOBUKAZU
IPC: G01J1/44
Abstract: PURPOSE:To enable the time of an A/D conversion of fall in a desired range by comparing a photometric output with a reference voltage and changing cover a measuring range depending on the result of a comparison. CONSTITUTION:A photoelectric transducer SPD converts its photometric quantity to electric signals. An operational amplifier OPA and a negative feed back capacitor C1 constitute an integrating circuit. A comparator COP compares the integrated output of the amplifier OPA and a reference voltage Vr with each other. At the same time, the integrating circuit conducts an integration for a prescribed time and, when the integrated output of the amplifier OPA exceeds the reference voltage Vr, outputs a signal to a changeover circuit X to make capacitors C1 and C2 parallel and change over a range to 'high'. When an integration time has elapsed, the capacitors C1 and C2 are discharged by a signal from a microcomputer K and by a constant current from a constant voltage source V5 and a comparator COP' detects that the integrated output of the amplifier OPA becomes zero. Thus, the discharge time of the integrating circuit are counted by clock pulses whereby a photometric value is calculated.
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公开(公告)号：JPS6373122A
公开(公告)日：1988-04-02
申请号：JP12639887
申请日：1987-05-22
Applicant: MINOLTA CAMERA KK
Inventor： NARUSE KAZUHIKO , YUASA YOSHIO , ISHIKAWA NORIO
Abstract: PURPOSE:To make a display easy to observe and to decrease the possibility of erroneous operations of operating members, by selectively displaying the result of operation and photographed information, which is changed and stored by manual operation. CONSTITUTION:A display means is used both for the display of preset information and the display of operated information. The amounts of the displays are specified by switches Ls, Cs, Ks and Fs. When one of the switches is closed, one corresponding terminal of terminals 101-104 goes 'H' and the others go 'L'. Thus memory logic circuits 105 are cooperated. A display switching terminal 106 goes 'H' when one of the terminals 101-103 goes 'H'. The result of an operating circuit 108 is imparted to the display means 100 through a terminal 107. Meanwhile, when the terminal 104 goes 'H', the preset information in a presettable up/down counter 110 is displayed through a terminal 109. The preset information indicates the characteristic of the color temperature of film.
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公开(公告)号：JPS62161024A
公开(公告)日：1987-07-17
申请号：JP26607086
申请日：1986-11-07
Applicant: MINOLTA CAMERA KK
Inventor： NARUSE KAZUHIKO , YUASA YOSHIO
Abstract: PURPOSE:To obtain the title apparatus easy to use without making the constitution thereof complicated, by outputting a photometry start signal for starting photometry in accordance with the manual operation of a manual operation member. CONSTITUTION:A photometry start means CPU outputs a photometry start signal for starting photometry corresponding to the operation of a first manual operation member SW2. A photometric C1 starts photometry in accordance with said photometry start signal to display a photometric result on a display LCD. The, either one of a first measuring mode operating the means C1 corresponding to the photometry start signal to display the photometric result and a second measuring mode repeatedly operating the means C1 to successively integrate the photometric result and displaying the integrated result on the means LCD is selectively set by a mode change-over means CPU. A second manual operation member SW14 operated in order to select the measuring mode in usual is set to a third position by a mode selection means CPU not only to reset the integrated value in the integrating measuring mode but also to start photometric operation in accordance with the operation member SW2.
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公开(公告)号：JPS60227137A
公开(公告)日：1985-11-12
申请号：JP3117785
申请日：1985-02-18
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO
Abstract: PURPOSE:To improve a light measuring accuracy of multi type light measuring mode by providing the mode to stop an integration motion after resetting of the integration value of the amount of photodetection of after detection of the photodetection change and the mode to detect the change of photodetection after resetting and to start again the integration motion. CONSTITUTION:A photodetector 30 photodetects a light emitted from a strobo and a detecting circuit 31 detects the rising of strobo light. A photometric circuit 4 integrates the output current of the detector 30 with a capacitor of the inside by a signal of from the circuit 31. And the photometry is stopped by a signal (b) of from I/O report of CPU1 and also the integrated value is fed out to CPU1 via AD convertor 5. The integrated value is then reset by a signal (b'). Also SV setting circuit 34 is set up according to a film sensibility. When the circuit 31 detects the rising of strobo light after the reset of the integrated value by the selection of a motion mode selecting unit 18 the integration motion of the circuit 4 is started again. A photometry having a good accuracy can be thus performed similarly same as the case of non-code type mode, even in the case of multi type photometric mode.
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公开(公告)号：JPS57178117A
公开(公告)日：1982-11-02
申请号：JP6492681
申请日：1981-04-27
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , KAWAGOE NOBUKAZU
IPC: G01J1/44
Abstract: PURPOSE:To improve the processing performance of a microcomputer by integrating photometric signals for a constant time, and changing over the discharge currents thereof according to integrated quantities thereby controlling the counting time. CONSTITUTION:First when switches SW1, SW2 are opened, photometry is started via a photoelectric converter SPD, and the otput volage of an operational amplifier OPA is applied to comparators COP, COP'. A control circuit K emits a signal after a constant time to open the switch SW2, thereby holding the output volage of the amplifier OPA. When the output of the OPA during photometry exceeds a reference voltage Vr, the output of COP inverts, and a switch SW3 is closed by a changeover circuit X so that capacitors C1 and C2 are parallel connected. When the switch SW2 opens, SW4 and SW5 close and clock pulses are counted during the time until the output of the OPA goes to 0 by the discharge currents flowing through resistances R1, R2. Since the ranges are changed over, the processing efficiency of the microcomputer K is improved.
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Patent Agency Ranking
公开(公告)号：JPS5677726A
公开(公告)日：1981-06-26
申请号：JP15475379
申请日：1979-11-28
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , ISHIKAWA NORIO , HORIE IZUMI
Abstract: PURPOSE:To ensure a simple and quick decision of the correction filter, by obtaining directly the light balancing factor or the like from the measurement information of the light intensity of each color region and the information set in correspondence to the using film. CONSTITUTION:The photometric circuits 1-3 deliver a signal corresponding to the incident ray intensity of the red, green and blue regions each among the incident rays. The light balancing factor or the color correcting factor is led out through the processing circuits 40, 50, 60, 42, 52 and 62 each and based on the signals supplied from the voltage sources E0 and E2 corresponding to the necessary output signals delivered from the circuits 1-3 plus the color temperature of the using film. Thus the photographic color temperature display meters M0 and M2 perform the prescribed display.
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公开(公告)号：JPS5660419A
公开(公告)日：1981-05-25
申请号：JP13721079
申请日：1979-10-23
Applicant: MINOLTA CAMERA KK
Inventor： ISHIKAWA NORIO , TANIGUCHI NOBUYUKI , YUASA YOSHIO
Abstract: PURPOSE:To easily perform flash photography corresponding to lighting contrast by providing an arithmetic circuit which calculates the flash emission quantity according to the lighting contrast having been preset based on stationary light intensity, exposure control value, etc. CONSTITUTION:An arithmetic circuit 3 makes operations by predetermined formulas corresponding to the lighting contrast of the ratios of the quantities of stationary light and flash contributing to photography to be preset by a strobe device 10 based on the steady light intensity from a measuring circuit 1 and the exposure setting value by a setting device 2. The flash emission quantity by these operations is signal-converted, and is compared with the strobe light-measured quantity from a measuring circuit 4, whereby the flash emission time etc. are controlled. According to other calculated exposure specifications, an aperture control part, a shutter control part, etc. are controlled and these specifications are displayed. Hence, without the photographer's prior calculations, the flash photography of the correct exposure taking the lighting contrast into consideration is easily accomplished.
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公开(公告)号：JPS569730A
公开(公告)日：1981-01-31
申请号：JP8562579
申请日：1979-07-05
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , ISHIKAWA NORIO , TANIGUCHI NOBUYUKI
Abstract: PURPOSE:To make it possible to accurately obtain a correct aperture value without remeasuring even if the brightness of a stationary light changes by enabling the correct aperture value accounting for the stationary light at the flash photographing to be obtained without continuing the measuring during the preset exposure time. CONSTITUTION:This consists of the lst process of obtaining the signal corresponding to the quantity of emitted light of the flash Ps having beforehand been emitted based on the signal from a photometric circuit 20, the 2nd process of obtaining the signal corresponding to the intensity of stationary light Pa based on the signal from the photometric circuit 20, and the 3rd process of obtaining the correct aperture value at the flash photographing based on the signal corresponding to the quantity of emitted light of the flash Ps, the signal corresponding to the intensity of the stationary light Pa, the signal corresponding to the preset exposure time and the signal corresponding to the preset film sensitivity.
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公开(公告)号：JPS5554448A
公开(公告)日：1980-04-21
申请号：JP7665278
申请日：1978-06-23
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO
Abstract: PURPOSE:To obtain excellent manipulation by a miniature mechanism by carrying out a switchover of a measurement range and visual display by a digital signal outputted on the basis of the operation of a manual switch. CONSTITUTION:When display member 24 comes ON-OFF by flash signal generating circuit 30 and a measurement range setting request is sent, turning manual switch #ON inputs a pulse string signal from pulse generator 5 to counter 7 by opening AND 6 of pulse generator circuit 4 and when its carry signal is counted by counter 8, pulse signals of fixed time width appear at output terminals D1-D4 of decoder 9 at intervals of fixed time and are inputted to measuring circuit 10, making FET13 conductive. As a result, operational amplifier 11 is biased on the basis of resistance 14 and its amplification factor is set to a fixed measurement range. At the same time, latch decoder 21 decodes a data signal of the measurement range latched and the decoding output is sequentially displayed on display unit 22. Consequently, excellent manipulation can be obtained by a miniature mechanism.
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公开(公告)号：JPS5510569A
公开(公告)日：1980-01-25
申请号：JP8427878
申请日：1978-07-10
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , ISHIKAWA NORIO , TANIGUCHI NOBUYUKI
Abstract: PURPOSE:To secure an easy and accurate setting for the degree of exposure by processing the readings of the steady light and the steady light piled on by the flash light through the microcomputer and securing automatic calculation and display for the effect by which only the flash light can contribute to the subject. CONSTITUTION:When the exposure meter is turned to the subject and switch 16 is closed, transistor 6 and 14 conduct via control circuit 17. And at the same time transistor 13 becomes nonconductive, and the flash light is emitted. Thus photo detector 1 receives the steady light piled on by the flash light, and the photometric voltage integrated value of the steady light piled on by the flash light which received the logarithmic compression via capacitor 12 and the like is applied to microcomputer 23 via A/D converter 15. After the lapse of the flash light time, the digital photometric voltage of the steady light is supplied in the same way to computer 23. Then computer 23 calculates the exposure value caused by only the flash light in accordance with the photometric voltage difference of both sides and the set exposure control value obtained through shutter speed control circuit 27 and film sensitivity setting circuit 28. And the necessary exposure value is displayed on display units 29-31.
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