JPS5574426A - Photometer circuit - Google Patents

Photometer circuit

Info

Publication number
JPS5574426A
JPS5574426A JP14722778A JP14722778A JPS5574426A JP S5574426 A JPS5574426 A JP S5574426A JP 14722778 A JP14722778 A JP 14722778A JP 14722778 A JP14722778 A JP 14722778A JP S5574426 A JPS5574426 A JP S5574426A
Authority
JP
Japan
Prior art keywords
circuit
fets
sum
done
photodiodes
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.)
Pending
Application number
JP14722778A
Other languages
Japanese (ja)
Inventor
Hiroshi Shirasu
Akira Ogasawara
Takeshi Utagawa
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku KK
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 Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP14722778A priority Critical patent/JPS5574426A/en
Priority to DE19792947951 priority patent/DE2947951A1/en
Publication of JPS5574426A publication Critical patent/JPS5574426A/en
Priority to US06/294,724 priority patent/US4368383A/en
Pending legal-status Critical Current

Links

Landscapes

  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

PURPOSE: To measure the distribution of luminous intensity exactly by amplifying the difference between pulse outputs regardless of the magnitude of pulse output in time series from the photodiode array in the focus detector of camera and the like.
CONSTITUTION: FETs S1WS4 of the switching element sequence 2 are connected to the photodiodes D1WD4 of the photodiode array 1 respectively, the sampling hold circuit 3 is also connected to the array 1. The output side of the circuit 3 is connected to the operation circuit 20, which consists of operational amplifiers 6, 7, through the FET4, the output side of the circuit 20 is connected to the hold circuits 8W11, which have operational amplifiers 8b to 11b, through the FETs S10WS40. The FETs S1WS4 are driven by pulses with a time delay t1 in sequence, output voltages e1We4 corresponding to the intensity of incident ray to the photodiodes D1WD4 are produced in the circuit 3. By the processing in the operation circuit 20, a reference voltage Vr is stored in the hold circuit 8, the sum of (e2-e1) and Vr is done in the circuit 9, the sum of (e3-e1) and Vr is done in the circuit 10, and the sum of (e4-e1) and Vr is done in the circuit 11.
COPYRIGHT: (C)1980,JPO&Japio
JP14722778A 1978-11-30 1978-11-30 Photometer circuit Pending JPS5574426A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP14722778A JPS5574426A (en) 1978-11-30 1978-11-30 Photometer circuit
DE19792947951 DE2947951A1 (en) 1978-11-30 1979-11-28 LIGHT MEASURING DEVICE
US06/294,724 US4368383A (en) 1978-11-30 1981-08-20 System for focus detection utilizing a photoelectric sensor array

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14722778A JPS5574426A (en) 1978-11-30 1978-11-30 Photometer circuit

Publications (1)

Publication Number Publication Date
JPS5574426A true JPS5574426A (en) 1980-06-05

Family

ID=15425437

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14722778A Pending JPS5574426A (en) 1978-11-30 1978-11-30 Photometer circuit

Country Status (1)

Country Link
JP (1) JPS5574426A (en)

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