JPS5610218A - Recursive time-sharing digital photometer - Google Patents

Recursive time-sharing digital photometer

Info

Publication number
JPS5610218A
JPS5610218A JP8466979A JP8466979A JPS5610218A JP S5610218 A JPS5610218 A JP S5610218A JP 8466979 A JP8466979 A JP 8466979A JP 8466979 A JP8466979 A JP 8466979A JP S5610218 A JPS5610218 A JP S5610218A
Authority
JP
Japan
Prior art keywords
luminance
displayed
transmitted
signals
gates
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
JP8466979A
Other languages
Japanese (ja)
Other versions
JPS6045812B2 (en
Inventor
Tsukumo Nobusawa
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 JP8466979A priority Critical patent/JPS6045812B2/en
Publication of JPS5610218A publication Critical patent/JPS5610218A/en
Publication of JPS6045812B2 publication Critical patent/JPS6045812B2/en
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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE:To decrease the number of transmission lines and thus to grasp luminance information precisely by a system wherein a luminance signal obtained through a multitude of light receiving units is transmitted to a display through one transmission line, and a mean luminance is calculated and displayed. CONSTITUTION:Pulse signals f1-f3 different in frequency are oscillated 1-3 according to a luminance received on light receiving elements P1-P3, gates A1-A3 are opened in sequence according to an output of the oscillator 1, and thus the pulse signals f1-f3 are transmitted through a transmission line l. The transmitted signals f1-f3 pass an inhibition gate I3, gates A4-A6 are opened in sequence according to an output of monostable multivibrators 6a-6c, the signals are counted on binary counters 11-13 and then displayed L1-L3. Then can be displayed precisely by changing the number of recursive operations for transmission of a luminance corresponding signal to the counters 11-13 in multiple order through switching operation of an change-over swtich 10 according to a degree of the luminance of a light to measure.
JP8466979A 1979-07-04 1979-07-04 Repetitive time-division digital photometer Expired JPS6045812B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8466979A JPS6045812B2 (en) 1979-07-04 1979-07-04 Repetitive time-division digital photometer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8466979A JPS6045812B2 (en) 1979-07-04 1979-07-04 Repetitive time-division digital photometer

Publications (2)

Publication Number Publication Date
JPS5610218A true JPS5610218A (en) 1981-02-02
JPS6045812B2 JPS6045812B2 (en) 1985-10-12

Family

ID=13837113

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8466979A Expired JPS6045812B2 (en) 1979-07-04 1979-07-04 Repetitive time-division digital photometer

Country Status (1)

Country Link
JP (1) JPS6045812B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888828A (en) * 1987-10-26 1989-12-26 Mont-Bell Co., Ltd. Sleeping bag device
US6764277B2 (en) 2001-01-29 2004-07-20 Daikin Industries, Ltd. Fan guard of fan unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4888828A (en) * 1987-10-26 1989-12-26 Mont-Bell Co., Ltd. Sleeping bag device
US6764277B2 (en) 2001-01-29 2004-07-20 Daikin Industries, Ltd. Fan guard of fan unit

Also Published As

Publication number Publication date
JPS6045812B2 (en) 1985-10-12

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