JPS57150809A - Automatic focus controlling device - Google Patents

Automatic focus controlling device

Info

Publication number
JPS57150809A
JPS57150809A JP3615681A JP3615681A JPS57150809A JP S57150809 A JPS57150809 A JP S57150809A JP 3615681 A JP3615681 A JP 3615681A JP 3615681 A JP3615681 A JP 3615681A JP S57150809 A JPS57150809 A JP S57150809A
Authority
JP
Japan
Prior art keywords
photographed
liquid crystal
lens
electric field
lenses
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
JP3615681A
Other languages
Japanese (ja)
Inventor
Takehiko Sasaki
Takatoshi Kuzumoto
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP3615681A priority Critical patent/JPS57150809A/en
Publication of JPS57150809A publication Critical patent/JPS57150809A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To detect a focal distance pure-electrically, by constituting a lens of a photodetecting element for photodetecting the reflected rays from a lens and an object to be photographed, of a liquid crystal, and providing a feeding means for variably controlling the focal distance. CONSTITUTION:Lenses 1, 1' and a glass plate 2 are connected in one body through a spacer 4 by sealing a space between the glass lenses 1, 1' whose radius of curvature is different from each other, and the glass plate 2, with a TN liquid crystal 3. On the inside surface of the lenses 1, 1' and the plate 2, a transparent electrode is provided as a feeding means for the liquid crystal 3. A liquid crystal lens 21 is fixed on the optical axis together with a polarization plate, and a focal distance of polarization transmitted when an electric field is applied is variably controlled. Accordingly, an image of an object to be photographed can be formed on a photodetecting element 6 by adjusting the applied electric field, and a focused clear image of an object to be photographed is obtained on a film surface 10 by generating a focusing signal corresponding to a value of the applied electric field in said case, moving a photographing lens 9, and forming the image of the object to be photographed, on the film surface 10.
JP3615681A 1981-03-12 1981-03-12 Automatic focus controlling device Pending JPS57150809A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3615681A JPS57150809A (en) 1981-03-12 1981-03-12 Automatic focus controlling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3615681A JPS57150809A (en) 1981-03-12 1981-03-12 Automatic focus controlling device

Publications (1)

Publication Number Publication Date
JPS57150809A true JPS57150809A (en) 1982-09-17

Family

ID=12461905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3615681A Pending JPS57150809A (en) 1981-03-12 1981-03-12 Automatic focus controlling device

Country Status (1)

Country Link
JP (1) JPS57150809A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6256918A (en) * 1985-09-06 1987-03-12 Olympus Optical Co Ltd Variable power finder optical system
JPH0311313A (en) * 1989-06-08 1991-01-18 Olympus Optical Co Ltd Focus detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6256918A (en) * 1985-09-06 1987-03-12 Olympus Optical Co Ltd Variable power finder optical system
JPH0311313A (en) * 1989-06-08 1991-01-18 Olympus Optical Co Ltd Focus detector

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