JPS5711317A - Focusing device and optical system - Google Patents

Focusing device and optical system

Info

Publication number
JPS5711317A
JPS5711317A JP8557680A JP8557680A JPS5711317A JP S5711317 A JPS5711317 A JP S5711317A JP 8557680 A JP8557680 A JP 8557680A JP 8557680 A JP8557680 A JP 8557680A JP S5711317 A JPS5711317 A JP S5711317A
Authority
JP
Japan
Prior art keywords
focusing
mask
image
lights
optical system
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
JP8557680A
Other languages
Japanese (ja)
Inventor
Yuji Ito
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP8557680A priority Critical patent/JPS5711317A/en
Publication of JPS5711317A publication Critical patent/JPS5711317A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Focusing (AREA)
  • Liquid Crystal (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To control focusing without the attachment/detachment of a focusing mark mask by forming the image of the mask composed of electric optical elements with plural lights refracted and separated by a double-wedge prism. CONSTITUTION:An incident light is refracted by a double-wedge prism 3 for light splitting and separated into plural lights. Two images of a focusing mark mask formed by the part, in which transparent electrodes 9 and 9' to which driving voltages are applied and which are composed of liquid crystal 8 forming electric optical elements are overlapped, are image-formed by two lights. When an objective lens or the like is moved so that 2 images are overlapped so as to become a single image, the optical system is focused. When the switch S is opened after focusing, the focusing mark mask is not formed, making it possible to control focusing without the attachment/detachment of the mask. The same result is obtained when electrocromy is used instead of liquid crystal.
JP8557680A 1980-06-24 1980-06-24 Focusing device and optical system Pending JPS5711317A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8557680A JPS5711317A (en) 1980-06-24 1980-06-24 Focusing device and optical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8557680A JPS5711317A (en) 1980-06-24 1980-06-24 Focusing device and optical system

Publications (1)

Publication Number Publication Date
JPS5711317A true JPS5711317A (en) 1982-01-21

Family

ID=13862632

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8557680A Pending JPS5711317A (en) 1980-06-24 1980-06-24 Focusing device and optical system

Country Status (1)

Country Link
JP (1) JPS5711317A (en)

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