JPS5713436A - Focal plate - Google Patents

Focal plate

Info

Publication number
JPS5713436A
JPS5713436A JP8802780A JP8802780A JPS5713436A JP S5713436 A JPS5713436 A JP S5713436A JP 8802780 A JP8802780 A JP 8802780A JP 8802780 A JP8802780 A JP 8802780A JP S5713436 A JPS5713436 A JP S5713436A
Authority
JP
Japan
Prior art keywords
luminous fluxes
light sources
lenses
generated
curved surfaces
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
JP8802780A
Other languages
Japanese (ja)
Inventor
Takashi Suzuki
Kiyoshi Iizuka
Keiji Otaka
Hidemasa Mizutani
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 JP8802780A priority Critical patent/JPS5713436A/en
Priority to DE19813125317 priority patent/DE3125317A1/en
Publication of JPS5713436A publication Critical patent/JPS5713436A/en
Priority to US06/473,266 priority patent/US4421398A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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)
  • Optics & Photonics (AREA)
  • Viewfinders (AREA)

Abstract

PURPOSE:To increase the luminosity of a finder image by arranging many curved surfaces in a micro lens shape regularly at 5-30mum pitches and by connecting those curved surfaces by a curved surface with a radius of curvature differing in sign from them. CONSTITUTION:The figure shows an interferometer forming a focal plate composed of a laser luminous flux 1, beam expander systems 2 and 3, a lens holder 4 holding three lenses 51-53, and three real spot light sources 61-63 generated by three convex lenses. A plane determined by three points of the real spot light sources 61-63 coincides with the focal plane of a lens 7, which emits three parallel luminous fluxes 81-83 to an optical recording material 9. The interval between the lenses 2 and 3 is adjusted so that irradiation areas of a photosensitive material surface irradiated with those three parallel luminous fluxes overlaps with one another as an area 10. Interference franges among three luminous fluxes are generated at a part 10 where expanded luminous fluxes 81-83 from respective light sources overlap.
JP8802780A 1980-06-27 1980-06-27 Focal plate Pending JPS5713436A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP8802780A JPS5713436A (en) 1980-06-27 1980-06-27 Focal plate
DE19813125317 DE3125317A1 (en) 1980-06-27 1981-06-27 ADJUSTING DISC
US06/473,266 US4421398A (en) 1980-06-27 1983-03-14 Focussing plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8802780A JPS5713436A (en) 1980-06-27 1980-06-27 Focal plate

Publications (1)

Publication Number Publication Date
JPS5713436A true JPS5713436A (en) 1982-01-23

Family

ID=13931335

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8802780A Pending JPS5713436A (en) 1980-06-27 1980-06-27 Focal plate

Country Status (1)

Country Link
JP (1) JPS5713436A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946252A (en) * 1987-08-05 1990-08-07 Asahi Kogaku Kogyo Kabushiki Kaisha Focusing screen
JP2018063447A (en) * 2012-12-21 2018-04-19 株式会社リコー Image display device, moving body and scanned surface element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4946252A (en) * 1987-08-05 1990-08-07 Asahi Kogaku Kogyo Kabushiki Kaisha Focusing screen
JP2018063447A (en) * 2012-12-21 2018-04-19 株式会社リコー Image display device, moving body and scanned surface element
JP2019056923A (en) * 2012-12-21 2019-04-11 株式会社リコー Image display device, moving body and scanned surface element

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