JPS60613B2 - 露出計のデジタル表示回路 - Google Patents

露出計のデジタル表示回路

Info

Publication number
JPS60613B2
JPS60613B2 JP50140917A JP14091775A JPS60613B2 JP S60613 B2 JPS60613 B2 JP S60613B2 JP 50140917 A JP50140917 A JP 50140917A JP 14091775 A JP14091775 A JP 14091775A JP S60613 B2 JPS60613 B2 JP S60613B2
Authority
JP
Japan
Prior art keywords
transistor
transistors
circuit
output
collectors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
JP50140917A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5264981A (en
Inventor
雅博 川崎
好雄 沢田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP50140917A priority Critical patent/JPS60613B2/ja
Priority to GB47590/76A priority patent/GB1525360A/en
Priority to US05/744,851 priority patent/US4112439A/en
Priority to FR7635594A priority patent/FR2333227A1/fr
Priority to DE2653625A priority patent/DE2653625C3/de
Priority to DE2660031A priority patent/DE2660031C2/de
Publication of JPS5264981A publication Critical patent/JPS5264981A/ja
Publication of JPS60613B2 publication Critical patent/JPS60613B2/ja
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/34—Analogue value compared with reference values
    • H03M1/36—Analogue value compared with reference values simultaneously only, i.e. parallel type
    • H03M1/361—Analogue value compared with reference values simultaneously only, i.e. parallel type having a separate comparator and reference value for each quantisation level, i.e. full flash converter type
    • H03M1/366—Analogue value compared with reference values simultaneously only, i.e. parallel type having a separate comparator and reference value for each quantisation level, i.e. full flash converter type using current mode circuits, i.e. circuits in which the information is represented by current values rather than by voltage values

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Amplifiers (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Analogue/Digital Conversion (AREA)
  • Led Devices (AREA)
JP50140917A 1975-11-25 1975-11-25 露出計のデジタル表示回路 Expired JPS60613B2 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP50140917A JPS60613B2 (ja) 1975-11-25 1975-11-25 露出計のデジタル表示回路
GB47590/76A GB1525360A (en) 1975-11-25 1976-11-16 Digital display system for a photographic exposure meter
US05/744,851 US4112439A (en) 1975-11-25 1976-11-24 Digital display circuit for a photographic exposure meter
FR7635594A FR2333227A1 (fr) 1975-11-25 1976-11-25 Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique
DE2653625A DE2653625C3 (de) 1975-11-25 1976-11-25 Digitale Anzeigeschaltung für einen photographischen Belichtungsmesser
DE2660031A DE2660031C2 (de) 1975-11-25 1976-11-25 Digitale Anzeigeschaltung für einen fotografischen Belichtungsmesser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50140917A JPS60613B2 (ja) 1975-11-25 1975-11-25 露出計のデジタル表示回路

Publications (2)

Publication Number Publication Date
JPS5264981A JPS5264981A (en) 1977-05-28
JPS60613B2 true JPS60613B2 (ja) 1985-01-09

Family

ID=15279812

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50140917A Expired JPS60613B2 (ja) 1975-11-25 1975-11-25 露出計のデジタル表示回路

Country Status (5)

Country Link
US (1) US4112439A (2)
JP (1) JPS60613B2 (2)
DE (2) DE2653625C3 (2)
FR (1) FR2333227A1 (2)
GB (1) GB1525360A (2)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4305064A (en) * 1977-09-26 1981-12-08 Motorola Inc. High density analog-to-digital converter
JPS6010569B2 (ja) * 1977-10-08 1985-03-18 オリンパス光学工業株式会社 写真撮影装置の測光回路
FR2439392A1 (fr) * 1978-10-19 1980-05-16 Centre Nat Etd Spatiales Appareil de mesure instantane de l'eclairement energetique ou physiologique
FR2454612A1 (fr) * 1979-04-18 1980-11-14 Jean Zinopoulos Indicateur de luminosite d'ambiance nocturne
JPS5670533A (en) * 1979-11-13 1981-06-12 Asahi Optical Co Ltd Control circuit for exposure time of camera
JPS57130235U (2) * 1981-02-09 1982-08-13
US4438388A (en) 1981-12-11 1984-03-20 Motorola, Inc. Single stage operational amplifier voltage reference
US4717936A (en) * 1983-05-02 1988-01-05 Canon Kabushiki Kaisha Display device for camera
US4868482A (en) * 1987-10-05 1989-09-19 Western Digital Corporation CMOS integrated circuit having precision resistor elements

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3858199A (en) * 1973-01-03 1974-12-31 Westinghouse Electric Corp Tracking level detector
JPS5539372Y2 (2) * 1973-07-27 1980-09-13
US3968486A (en) * 1974-06-20 1976-07-06 Gerdes Richard C Analog to digital converter
JPS5164923A (en) * 1974-12-03 1976-06-04 Nippon Kogaku Kk Kamerano roshutsukeino hyojikairo
US3984832A (en) * 1975-06-06 1976-10-05 Motorola, Inc. Series current analog to digital converter

Also Published As

Publication number Publication date
DE2653625C3 (de) 1979-01-18
GB1525360A (en) 1978-09-20
DE2660031B1 (de) 1979-08-02
FR2333227A1 (fr) 1977-06-24
DE2660031C2 (de) 1980-04-17
JPS5264981A (en) 1977-05-28
DE2653625A1 (de) 1977-06-08
FR2333227B1 (2) 1980-11-07
US4112439A (en) 1978-09-05
DE2653625B2 (de) 1978-05-11

Similar Documents

Publication Publication Date Title
US3992622A (en) Logarithmic amplifier with temperature compensation means
US4092611A (en) Adaptively biased differential operational amplifier for photo diode
JP2837080B2 (ja) 乗算回路
JPS60613B2 (ja) 露出計のデジタル表示回路
US4119869A (en) Constant current circuit
JPH0152783B2 (2)
JPS5936219B2 (ja) カメラノデイジタルヒヨウジカイロ
KR860000475B1 (ko) 정전류 회로
US4507577A (en) Nth Order function converter
JP3643389B2 (ja) 定電圧回路
US4004853A (en) Exposure meter circuit
JPS5914739Y2 (ja) 露出計におけるデジタル表示回路
JPS6025551Y2 (ja) 露出計における表示回路
JPH04113275A (ja) 最大値出力回路及び最小値出力回路並びに最大値最小値出力回路
JPS63309826A (ja) 測光装置
JPH0828629B2 (ja) 差動増幅器
JPS5925165B2 (ja) ロシユツケイニオケル デイジタルヒヨウジカイロ
SU690426A1 (ru) Экспонометрическое фотоприемное устройство
JP3381100B2 (ja) 増幅器
JP2776019B2 (ja) 定電圧回路
US3944370A (en) Exposure time indication apparatus
SU523510A1 (ru) Усилитель
JPS6351496B2 (2)
JPH0342535A (ja) 温度センサ回路
JPS62214728A (ja) Ｄ／ａ変換器