JPS57109923A - Liquid crystal focusing screen of camera - Google Patents

Liquid crystal focusing screen of camera

Info

Publication number
JPS57109923A
JPS57109923A JP55187437A JP18743780A JPS57109923A JP S57109923 A JPS57109923 A JP S57109923A JP 55187437 A JP55187437 A JP 55187437A JP 18743780 A JP18743780 A JP 18743780A JP S57109923 A JPS57109923 A JP S57109923A
Authority
JP
Japan
Prior art keywords
resistance
screen
focusing screen
camera
lever
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
JP55187437A
Other languages
Japanese (ja)
Inventor
Mitsuharu Watanabe
Michio Yagi
Kazuo Shiozawa
Yoshihiro Higuchi
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP55187437A priority Critical patent/JPS57109923A/en
Publication of JPS57109923A publication Critical patent/JPS57109923A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
    • G03B13/18—Focusing aids
    • G03B13/24—Focusing screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Viewfinders (AREA)
  • Liquid Crystal (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

PURPOSE:To realize the photometry for exposure control with the light that passed through a liquid focusing screen, by compensating or controlling an exposure controlling circuit in accordance with the presence or absence of the voltage to be applied to the focusing screen. CONSTITUTION:The voltage is applied to transparent electrodes 12 and 16 of a liquid crystal focusing screen 1 via a variable resistance 54a. At the same time, the exposure controlling part of a camera includes a photodetector 53, a variable resistance 54b and an exposure controlling part 55. The resistances 54a and 54b vary in coupling to each other. No change is caused to the output of the part 55 although a camera is set to the same subject of the same luminance along with a shift of a resistance lever 54c. Accordingly, the lever 54c is shifted to the position where the resistance value of the resistance 54b is large to increase the brightness of the finder viewfield when the subject is dark. While the lever 54c is shifted at the position where the resistance value of the resistance 54b is small to carry out the focusing with the screen 1 changed cloudy in case the subject is sufficiently bright. In such a way, the photometry is possible for the exposure control with the light passed through the screen 1.
JP55187437A 1980-12-26 1980-12-26 Liquid crystal focusing screen of camera Pending JPS57109923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55187437A JPS57109923A (en) 1980-12-26 1980-12-26 Liquid crystal focusing screen of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55187437A JPS57109923A (en) 1980-12-26 1980-12-26 Liquid crystal focusing screen of camera

Publications (1)

Publication Number Publication Date
JPS57109923A true JPS57109923A (en) 1982-07-08

Family

ID=16206039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55187437A Pending JPS57109923A (en) 1980-12-26 1980-12-26 Liquid crystal focusing screen of camera

Country Status (1)

Country Link
JP (1) JPS57109923A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58123525A (en) * 1982-01-19 1983-07-22 Nippon Kogaku Kk <Nikon> Optical device
US5333031A (en) * 1991-08-21 1994-07-26 Minolta Camera Kabushiki Kaisha Camera having a liquid crystal focusing screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58123525A (en) * 1982-01-19 1983-07-22 Nippon Kogaku Kk <Nikon> Optical device
US5333031A (en) * 1991-08-21 1994-07-26 Minolta Camera Kabushiki Kaisha Camera having a liquid crystal focusing screen

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