JPS5651727A - Exposure control method - Google Patents

Exposure control method

Info

Publication number
JPS5651727A
JPS5651727A JP12765479A JP12765479A JPS5651727A JP S5651727 A JPS5651727 A JP S5651727A JP 12765479 A JP12765479 A JP 12765479A JP 12765479 A JP12765479 A JP 12765479A JP S5651727 A JPS5651727 A JP S5651727A
Authority
JP
Japan
Prior art keywords
luminance
exposure
bmin
bmax
luminances
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
JP12765479A
Other languages
Japanese (ja)
Other versions
JPS6356964B2 (en
Inventor
Takaaki Terashita
Kazuo Shioda
Kenji Nakauchi
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP12765479A priority Critical patent/JPS5651727A/en
Publication of JPS5651727A publication Critical patent/JPS5651727A/en
Publication of JPS6356964B2 publication Critical patent/JPS6356964B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE: To make possible correct exposure even for the subject of the special luminance distribution by obtaining the subject luminances through the use of maximum, minimum and means luminances and controlling exposure according to thus obtained luminance.
CONSTITUTION: The respective photometric outputs of a photometric part 3 having multiple photometric elements 2aW2n on a substrate 1 are respectively logarithmically compressed 4 and the respective compressed signals are sent to a maximum luminance and minimum luminance detecting circuit 5, by which the maximum luminance Bmax. and minimum luminance Bmin are detected. In addition, a mean luminance detecting circuit 6 detects the mean luminance Bm from the logarithmically compressed signals. The luminances Bmax, Bmin, Bm are supplied to an arithmetic circuit 7 and the subject luminance B is calculated by the formula B= K1+K2.Bmax.+K3.Bmin+K4.Bm. A correct aperture value and shutter speed are calculated 9 from the luminance B and the exposure information from an exposure information setting circuit 8, and based on the results of this calculation, the exposure controlling is performed by a control circuit 10.
COPYRIGHT: (C)1981,JPO&Japio
JP12765479A 1979-10-03 1979-10-03 Exposure control method Granted JPS5651727A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12765479A JPS5651727A (en) 1979-10-03 1979-10-03 Exposure control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12765479A JPS5651727A (en) 1979-10-03 1979-10-03 Exposure control method

Publications (2)

Publication Number Publication Date
JPS5651727A true JPS5651727A (en) 1981-05-09
JPS6356964B2 JPS6356964B2 (en) 1988-11-09

Family

ID=14965431

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12765479A Granted JPS5651727A (en) 1979-10-03 1979-10-03 Exposure control method

Country Status (1)

Country Link
JP (1) JPS5651727A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113917A (en) * 1981-12-28 1983-07-07 Mamiya Koki Kk Photometric device of camera
JPS58150936U (en) * 1982-04-02 1983-10-08 株式会社クボタ Structure of the waste straw processing section of a combine harvester
JPS58161449U (en) * 1982-04-23 1983-10-27 株式会社クボタ Threshing machine waste straw processing equipment
JP2010004193A (en) * 2008-06-19 2010-01-07 Mitsumi Electric Co Ltd Semiconductor integrated circuit device and offset cancel setting system
JP2011151935A (en) * 2010-01-21 2011-08-04 Ricoh Co Ltd Power supply device, electric apparatus, and image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113917A (en) * 1981-12-28 1983-07-07 Mamiya Koki Kk Photometric device of camera
JPS58150936U (en) * 1982-04-02 1983-10-08 株式会社クボタ Structure of the waste straw processing section of a combine harvester
JPS58161449U (en) * 1982-04-23 1983-10-27 株式会社クボタ Threshing machine waste straw processing equipment
JP2010004193A (en) * 2008-06-19 2010-01-07 Mitsumi Electric Co Ltd Semiconductor integrated circuit device and offset cancel setting system
JP2011151935A (en) * 2010-01-21 2011-08-04 Ricoh Co Ltd Power supply device, electric apparatus, and image forming apparatus

Also Published As

Publication number Publication date
JPS6356964B2 (en) 1988-11-09

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