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公开(公告)号：JPS58149036A
公开(公告)日：1983-09-05
申请号：JP3324582
申请日：1982-03-02
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , YASUMOTO HIDETOSHI , NARUSE KAZUHIKO , KAWAGOE NOBUKAZU , INABA MASAHITO
Abstract: PURPOSE:To know and control the quantity of the light to be emitted by the light source of an enlarger by which best prints are obtained even if the state of an optical system for enlarging changes, by providing a detecting circuit for quantity of emitted light and a detecting circuit for exposure and obtaining printing conditions for various optical states for enlarging in accordance with the ratios of the output data of these detecting circuits. CONSTITUTION:A capacitor 45 for integration starts integration of the output current of a photodetector PD1 by the emission of a xenon tube. Since the emission of light is just started in this stage, the output terminals d1, d2, d3 of comparators 33, 34, 39 are all ''Low'' and the control input of a multiplexer 40 is ''Low''. Therefore, the data of unit quantity f1 of light emission from a shift circuit 30 is outputted. The signal obtd. by cnverting the data of f1 to an analog signal with a D-A converter 41 and the detection signal for quantity of light emission outputted form an integrating capacitor 45 are compared in a comparator 42, and when the level of the latter attains the level of the former, the output of the comparator 42 inverts to ''High'', and the signal thereof is fed through an AND circuit 54 and an OR circuit 55 to a well-known stopping circuit 48 for light emission, whereby the emission of light by the xenon lamp is stopped.
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公开(公告)号：JPS5791420A
公开(公告)日：1982-06-07
申请号：JP16895180
申请日：1980-11-28
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , NARUSE KAZUHIKO
Abstract: PURPOSE:To display the density of a measured part by dispalying exposure values which deviate from proper values and the density index of a photometric part in a field on a film. CONSTITUTION:When a switch 22 or 23 is turned on, a display dot which corresponds to intermediate density moves on a display element part LE according to a deviation calculation value by a deviation calculating circuit part CA. Then, a segment display part 11 displayes an exposure value for reproducing on a photographic film the density of a measured object corresponding to a lit display dot. Then, a switch 26 is turned on to store data from a photometric circuit 1 in a memory part M, and a next object is measured by the circuit 1. At this time, when photographing is done with an exposure value based upon the display part 11, a dot which corresponds to density, with which the next object is reproduced on the photographic film comes on. Therefore, the element part LE is looked at to confirm how the subject which corresponds to the lit display dot is reproduced on the photographic film.
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公开(公告)号：JPS5699324A
公开(公告)日：1981-08-10
申请号：JP154880
申请日：1980-01-09
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , TANIGUCHI NOBUYUKI , ISHIKAWA NORIO
Abstract: PURPOSE:To make possible the flash photographing which takes stationary light and flash into consideration and eliminate the effect of the reflectance of a subject by controlling the quantity of light emission based on subject distance, preset light quantity contrast and exposure control value and stationary light. CONSTITUTION:This device is provided with a circuit LM0 which measures stationary light, a device SO which outputs exposure control value signal, a device DI which generates the distance up to the subject and a device SE0 which sets lighting contrast. The signal corresponding to the quantity of emission of flash is calculated A based on the signals from the respective devices LM0, SO, DI, SE0, and the quantity of flash emission is controlled at CA, CT based on the calculated signal. Hence, the flash photographing taking stationary light and flash into consideration may be carried out.
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公开(公告)号：JPS5674032A
公开(公告)日：1981-06-19
申请号：JP14928879
申请日：1979-11-16
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , NARUSE KAZUHIKO
IPC: H02J1/00
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公开(公告)号：JPS54115221A
公开(公告)日：1979-09-07
申请号：JP2327678
申请日：1978-02-28
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO , ISHIDA TOKUJI , TANIGUCHI NOBUYUKI
IPC: G03B9/62
Abstract: PURPOSE:To save power consumption of circuit by changing over the period of the reference pulse applied to the circuit in corresponding to exposure control. CONSTITUTION:When a switch S is closed, a logic circuit 3 is so changed over as to select and output the pulses of the line (b) and a frequency divider 2 divides the input pulses down to 1/n. Hence, during the exposure control period when S is held closed, the pulses of the frequency (nf) are being outputted but the output pulse number of the frequency divider 2 is (f) and the watch for data imprinting, etc. operate at the same rate as that of the ordinary time. Then, the portions other than the exposure control circuit are operated by the pulses of a long period and it turns out that an oscillator 1, too, operates at the high frequency number only in the exposure control period, thus power consumption may be saved.
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Patent Agency Ranking
公开(公告)号：JPS54112629A
公开(公告)日：1979-09-03
申请号：JP2030278
申请日：1978-02-22
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO
Abstract: PURPOSE:To improve display accuracy with simple circuit constitution by storing the corresponding data with the APEX value being a necessary parameter for photographing as the address of a memory device and directly obtaining the specified digital data for displaying. CONSTITUTION:After the data comprising digitizing the analog signal corresponding to the APEX value BV of the subject luminance from a measuring circuit 4 with an A-D converter 5 to a CPU 1, the digital signals corresponding to the set shutter speed TV and set film sensitivity SV respectively expressed in APEX values are inputted and the APEX operation of 10 AV=(BV+SV-TV) is accomplished by using the register, etc. in the CPU 1. Next, whether the calculated 10 AV is within the specified display range or not is judged and when it is over or under, it is indicated by a display device 8 and when it is within the range, the instruction of 10 AVdivided by 10 is accomplished. Thereby fine display accuracy may be obtained with the simple circuit constitution.
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公开(公告)号：JPS5323678A
公开(公告)日：1978-03-04
申请号：JP9832176
申请日：1976-08-17
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO
Abstract: PURPOSE:To exactly measure genuine color of printed surface, coated surface, etc., without considering reflection at surface of solvent, varnish, etc., existing on surface of measured plane, by irradiating linear polarized flux of light parallel to measured plane, at Brewster's angle to measured plane.
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公开(公告)号：JPS62161128A
公开(公告)日：1987-07-17
申请号：JP26606886
申请日：1986-11-07
Applicant: MINOLTA CAMERA KK
Inventor： NARUSE KAZUHIKO , YUASA YOSHIO
Abstract: PURPOSE:To obtain an inexpensive liquid crystal display device which permits viewing of a display even in a dark place, suppresses the electric consumption required for the same and does not require a special space by having a liquid crystal display means, memory means, manual operating member, display control means, illuminating means, and control means. CONSTITUTION:A reset signal is inputted from a reset signal generator GE3 to the input terminal RESET of a microcomputer CPU at the point of the time when a power source is thrown. The microcomputer CPU starts the execution of a program from the prescribed address of the program stored in a PROM. The output terminal PO4 of the microcomputer CPU supplies a signal to a driver DV3 for illumination according to the program. The driver DV3 puts an illuminating member LED1 for display placed on the rear of a display element LCD of a semi-transmission type into a lighting up state by the high signal from the output terminal PO4.
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公开(公告)号：JPS6234018A
公开(公告)日：1987-02-14
申请号：JP17381985
申请日：1985-08-07
Applicant: MINOLTA CAMERA KK
Inventor： NARUSE KAZUHIKO , YUASA YOSHIO
Abstract: PURPOSE:To make it possible to accurately confirm the number of stored photometric values, by mounting a count means for counting the number of stored photometric values and a number display means for performing display on the basis of the count value. CONSTITUTION:A photoelectric converter circuit C1 transmits the electric signal proportional to the intensity of light incident to a light receiving element to the integrating circuit C2 and optical trigger detection circuit C4 of the next stage. Next, the circuit C4 supplies an integration start signal to the circuit C2 and transmits a signal showing the incidence of light having pulse like light emission to a microcomputer CPU. Subsequently, the circuit C2 integrates the electric signal corresponding to the incident light from the circuit C1 only for a preset time. This electric signal is transmitted to CPU while converted on the basis of the signal from an output terminal PO2 by an AD converter C3 and CPU subsequently counts the oscillation pulse from a reference pulse oscillator GE1. The photometric data measured by a measuring circuit is held to CPU and exposure operation is performed and a count value is displayed on a display illumination member LED1.
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公开(公告)号：JPS60220831A
公开(公告)日：1985-11-05
申请号：JP3117685
申请日：1985-02-18
Applicant: MINOLTA CAMERA KK
Inventor： YUASA YOSHIO
Abstract: PURPOSE:To eliminate a waste of time in ordinary photometric operation by providing an ordinary light metering mode in addition to a code type photometric mode, and metering and integrating light for a predetermined time regardless of an exposure time when the ordinary photometric mode is set. CONSTITUTION:A photodetecting element 30 photodetects light emitted by a strobe and a strobe detecting circuit 31 outputs a pulse at the rise of the strobe light and by-pass the output current of the photodetecting element 30 except during photometric operation. A photometry circuit 4 integrates the output current of the photodetecting element 30 by a capacitor provided to the circuit 4 and outputs a signal for breaking the detecting circuit 31 during photometric operation. A strobe 32 receives a synchronizing code from a terminal (c) and emits light. An SV setting circuit 34 outputs a digital signal corresponding to the apex value of film sensitivity set by a film sensitivity setting member. Consequently, three photometric modes are obtained with one exposure meter and arithmetic is carried out corresponding to the respective modes, so a measurement of flash light and a measurement of ordinary light are both taken properly.
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