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公开(公告)号：JPS5786825A
公开(公告)日：1982-05-31
申请号：JP16371980
申请日：1980-11-19
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To achieve exposure as expected by indicating the relation between a shutter speed and latitude clearly, by displaying the difference in stage between a shutter speed which corresponds to brightness information and an actual shutter speed and the latitude of a photographic film in parallel. CONSTITUTION:At the circumferential part of a finder screen, two arrays 2 and 3 of liquid crystal elements are arranged and in the center of the array 2 of elements, a four-digit segment display part is provided to display a manual shutter speed. The element array 2 displays the latitude of a photographic film. Opaque elements L12 and L'13 in the element array 3 indicate the difference between the maximum brightness and minimum brightness of a subject for a 1/125 second shutter speed. One element corresponds to a half stage. When the shutter speed is set to 1/500 second, the elements L12 and L'13 are lowered by two stages to an L8 and an L'7, obtaining proper exposure. Thus, the relation between the shutter speed and latitude is shown clearly and exposure is obtain as expected.
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公开(公告)号：JPS5552039A
公开(公告)日：1980-04-16
申请号：JP12654578
申请日：1978-10-13
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To let display information to be readily grasped sensuously by numerically displaying exposure information in the central part on one side of the finder visual field and simultaneously dot displaying exposure factor information on both sides of exposure information display. CONSTITUTION:In the camera of a TTL photometric system, a 7-segment display device 13 is provided on the right central part of a finder visual field 23, by which the exposure information based on photometric values, e.g., shutter value, is numerically displayed. Below and above the display device 13 are provided light emitting diode groups 21a-21e, 21a'-21e' as dot display means. The brightness of the spot photometric region for the mean photometric value displayed in the display means 13 and the information of exposure factor are simultaneously and sensuously in the mutual association on these dot display means 21.
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公开(公告)号：JPS5536895A
公开(公告)日：1980-03-14
申请号：JP8716179
申请日：1979-07-09
Applicant: MINOLTA CAMERA KK
Inventor： NANBA YASUHIRO , TSUJIMOTO TAKAYOSHI , YAMADA SEINI
Abstract: PURPOSE:To simplify the circuit constitution, by converting the optimum exposure time obtained by photometry at open aperture into program shutter time. CONSTITUTION:A memory circuit 2, a stage differential output circuit 4, a program shutter time signal generating circuit 5, an exposure time control circuit 7, and a stop-down device 6 are connected to a photoelectric conversion part 1. The photoelectric conversion part 1 measures the light of the subject transmitted through a photographic lens, and accounts the film sensitivity signal, etc. to output an optimum exposure time signal at open aperture, which is inputted into the stage differential output circuit 4 and program shutter time signal generating circuit 5 through the memory circuit 2. The stage differential output circuit 4 substracts the input signal from the output of the program shutter time signal generating circuit 5. According to this result, which is the number of stop-down stages at open aperture at the program shutter time, the stop-down device 6 is operated, and the program shutter time signal is inputted into the exposure time control circuit 7 to control the shutter.
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公开(公告)号：JPS5525024A
公开(公告)日：1980-02-22
申请号：JP9684778
申请日：1978-08-09
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To enable exposure time control be performed after travelling of the shutter front curtain by the specified distance by storing photometric output and measuring the light reflected from the film plane. CONSTITUTION:This unit is provided with a photometric means 28a which is capable of measuring the subject light before a moving mirror 6 retreats from the photographing light path, a circuit 38 which stores the signal corresponding to the output of the means 28a in correspondence to either of shutter release operation and independent manual operation, a photometric means 28b which measures the subject light reflected by the film plane and produces the output corresponding to this, a changeover means 50 which connects the output of the means 28b to an exposure tie control circuit 48 in place of the output of the memory circuit 38 when the front shutter memeber has operated by the specified quantity and a means 52 which inhibits its changeover when the independent manual operation is performed.
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公开(公告)号：JPS5433720A
公开(公告)日：1979-03-12
申请号：JP10001777
申请日：1977-08-20
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To reduce the size of an encoder by generating the code signals as a separate information output for the case, in which one group of two contacts contact with one conductor, and for the case, in which they contact with the two adjoining conductors.
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Patent Agency Ranking
公开(公告)号：JPS5428987A
公开(公告)日：1979-03-03
申请号：JP9388277
申请日：1977-08-04
Applicant: MINOLTA CAMERA KK
Inventor： TOMINAGA SHINJI , YAMADA SEINI
IPC: H04B10/00 , G03B17/38 , H04B10/07 , H04B10/114 , H04B10/524 , H04Q9/14
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公开(公告)号：JPS56121020A
公开(公告)日：1981-09-22
申请号：JP2389280
申请日：1980-02-26
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To change-over exposure modes through single operation by providing an information setting switch member dedicated to setting a diaphragm value and shutter speed, and another switch member with which a program shutter mode is set. CONSTITUTION:While three FFs 21, 46 and 57 are all reset, exposure control is exercised in program shutter mode P. With the shutter button pushed, an aperture value and shutter speed are displayed on display devices 72 and 73 on the basis of the signal and at the 2nd stage, release commanding is done. As switch 17 is placed at contact 17a in mode P, the diaphragm value signal is changed to the high- speed shutter side and then releasing the depression of switch 17 sets diaphragm- priority mode A. Operating switch 42 in mode A enables the setting of desired shutter speed mode S. In this constitution, the exposure controlling modes can be changed over by operating one of three switches.
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公开(公告)号：JPS5598730A
公开(公告)日：1980-07-28
申请号：JP648079
申请日：1979-01-22
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
IPC: G03B17/24
Abstract: PURPOSE:To imprint correct data without increasing volume by providing a data display part for imprinting, storing and imprinting the data thereof and providing switches, etc. for operating the data imprinting part in association with the film winding. CONSTITUTION:The device consists of a clock circuit 1, a memory 2 which stores calendar information, an imprinting part 3, and a power source self-holding circuit which consists of transistors Q1, Q2, resistances R2, R3, R4. The memory 2 stores the output of a decoder 1d by the output pulses of a one-shot circuit 4 which is triggered by a switch Sw2 operating in cooperation with the operation of shutter. The display of the numbers to be imprinted is done by segment display elements 3b. The signal of the film winding completion causes a switch Sw1 to change over to the contact b to supply electric power to the imprinting part 3, then the elements 3b go on and the data are imprinted on the film. When the second photographing is done, the switch Sw1 changes over to the contact (a) side.
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公开(公告)号：JPS54100724A
公开(公告)日：1979-08-08
申请号：JP751578
申请日：1978-01-25
Applicant: MINOLTA CAMERA KK
Inventor： SAWARA MASAYOSHI , YAMADA SEINI , KOBORI TOSHIO
Abstract: PURPOSE:To make the automatic selection of a program possible in accordance with the wide open f-number of an interchangeable lens by providing a program signal generating circuit for a program shutter, which has its program varying in accordance with a preset f-number. CONSTITUTION:When an interchangeable lens Ls having preset wide open f-number and minimum aperture is mounted in a camera so that the f-number is preset, the resistance of the potentiometer PM4 of a program signal generating circuit 3 is varied in accordance with the diaphragm stop step preset so that the photometric voltage from a photometric circuit 1 and the preset shutter time second voltage of from a reference voltage generating circuit 2 are impressed upon buffer amplifiers OP3 and OP4. A capacitor C1 is charged with the intermediate voltage of the output voltage of the amplifiers OP3 and OP4 so that a diaphragm AP is controlled though an electromagnet Mgl when the photometric voltage to be fed to the operational amplifier OP5 of an aperture determining circuit 4 becomes coincident with the intermediate voltage corresponding to the preset diaphragm stop. Then, the exposure time second is controlled through a capacitor C2 in accordance with the photometric voltage so that the program according to the wide open f- number of the lens can be automatically selected.
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公开(公告)号：JPS5489730A
公开(公告)日：1979-07-17
申请号：JP15959877
申请日：1977-12-27
Applicant: MINOLTA CAMERA KK
Inventor： YAMADA SEINI
Abstract: PURPOSE:To eliminate the setting and obtain a proper exposure by determining a diaphragm and a shutter speed under the requirements of standard photography, determining a program wherein both diaphragm and shutter speed are decided when it is bright while the diaphragm only is decided when dark, and determining an actual exposure time from the light which passes an automatically determined diaphragm. CONSTITUTION:The output of level shift circuit 5 immediately before the diaphragm is, first of all, stopped down in accordance with the instruction of shutter release is held as digital signal in the latch circuit. Next the contents of ROM 13 specified by the output of the latch circuit 12 which is address signal are read and analog voltage as program signal in the D-A conversion circuit 14 is given to comparation circuit 8. The circuit 8 compares output levels of photometric circuit 1 and circuit 14, and when the difference reaches the predetermined value, the electromagnet drive circuit 9 is operated. Electromagnet Mg1 locks diaphragm drive member. After the diaphragm aperture has been determined, exposure time control circuit 10 mamorizes the output signal of photometric circuit 1 prior to the rise start of reflecting mirror so that is starts to count the exposure time in response to the memorized value with the opening of the shutter, and the electromagnet is operated after the finish of counting time.
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