FR2333227A1 - Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique - Google Patents

Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique

Info

Publication number
FR2333227A1
FR2333227A1 FR7635594A FR7635594A FR2333227A1 FR 2333227 A1 FR2333227 A1 FR 2333227A1 FR 7635594 A FR7635594 A FR 7635594A FR 7635594 A FR7635594 A FR 7635594A FR 2333227 A1 FR2333227 A1 FR 2333227A1
Authority
FR
France
Prior art keywords
digital
analogue
exhibition display
digital converter
photographic exhibition
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.)
Granted
Application number
FR7635594A
Other languages
English (en)
French (fr)
Other versions
FR2333227B1 (ref
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
Publication of FR2333227A1 publication Critical patent/FR2333227A1/fr
Application granted granted Critical
Publication of FR2333227B1 publication Critical patent/FR2333227B1/fr
Granted 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)
  • Analogue/Digital Conversion (AREA)
  • Amplifiers (AREA)
  • Led Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Measurement Of Current Or Voltage (AREA)
FR7635594A 1975-11-25 1976-11-25 Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique Granted FR2333227A1 (fr)

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
FR2333227A1 true FR2333227A1 (fr) 1977-06-24
FR2333227B1 FR2333227B1 (ref) 1980-11-07

Family

ID=15279812

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7635594A Granted FR2333227A1 (fr) 1975-11-25 1976-11-25 Convertisseur analogique-numerique pour l'affichage numerique d'exposition photographique

Country Status (5)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (7)

* 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
JPS5670533A (en) * 1979-11-13 1981-06-12 Asahi Optical Co Ltd Control circuit for exposure time of camera
JPS57130235U (ref) * 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 (ref) * 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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
DE2653625A1 (de) 1977-06-08
US4112439A (en) 1978-09-05
GB1525360A (en) 1978-09-20
JPS60613B2 (ja) 1985-01-09
DE2653625B2 (de) 1978-05-11
FR2333227B1 (ref) 1980-11-07
DE2660031C2 (de) 1980-04-17
DE2660031B1 (de) 1979-08-02
JPS5264981A (en) 1977-05-28
DE2653625C3 (de) 1979-01-18

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Legal Events

Date Code Title Description
ST Notification of lapse