JPS56149028A - Projector - Google Patents

Projector

Info

Publication number
JPS56149028A
JPS56149028A JP5208880A JP5208880A JPS56149028A JP S56149028 A JPS56149028 A JP S56149028A JP 5208880 A JP5208880 A JP 5208880A JP 5208880 A JP5208880 A JP 5208880A JP S56149028 A JPS56149028 A JP S56149028A
Authority
JP
Japan
Prior art keywords
mirror
reflected
optical path
rays
projector
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
JP5208880A
Other languages
Japanese (ja)
Inventor
Koresuke Abe
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.)
Mitsutoyo Manufacturing Co Ltd
Original Assignee
Mitsutoyo Manufacturing 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 Mitsutoyo Manufacturing Co Ltd filed Critical Mitsutoyo Manufacturing Co Ltd
Priority to JP5208880A priority Critical patent/JPS56149028A/en
Publication of JPS56149028A publication Critical patent/JPS56149028A/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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

PURPOSE:To make a projector small-size and make formed images sharper by providing one or plural pieces of reflecting mirrors and an extra thin semitransparent mirror in the optical path for the rays guided to a screen surface through a projecting lens, thereby reducing the optical path length. CONSTITUTION:The rays past a projecting lens 13 are reflected by a reflecting mirror 16, and about half the rays thereof pass through an extra thin semitransparent mirror 17, thence they are reflected by a reflecting mirror 18, and further about half these beams are reflected by the mirror 17 and are irradiated onto the surface of a screen 14, whereby they are imaged. Since the fixed optical path length can be put in a small space by causing the transmission and reflection of light and allowing the light to reciprocate in this way, the projector is made smaller in size and lighter in weight; in addition, double imaging is obviated and the formed images are made sharper by forming the semitransparent mirror extremely thin.
JP5208880A 1980-04-19 1980-04-19 Projector Pending JPS56149028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5208880A JPS56149028A (en) 1980-04-19 1980-04-19 Projector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5208880A JPS56149028A (en) 1980-04-19 1980-04-19 Projector

Publications (1)

Publication Number Publication Date
JPS56149028A true JPS56149028A (en) 1981-11-18

Family

ID=12905066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5208880A Pending JPS56149028A (en) 1980-04-19 1980-04-19 Projector

Country Status (1)

Country Link
JP (1) JPS56149028A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100325417B1 (en) * 1999-04-30 2002-02-21 최해용 Wide viewing angle projection system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100325417B1 (en) * 1999-04-30 2002-02-21 최해용 Wide viewing angle projection system

Similar Documents

Publication Publication Date Title
FR2552896B1 (en) MIXED APPARATUS FOR PROJECTION AND BACKPROJECTION OF SLIDES
JPS5694887A (en) Projecting device
US2772600A (en) Image superimposition apparatus
KR920016867A (en) Light reflection and refraction
JPS56149028A (en) Projector
US2920527A (en) Method of and apparatus for increasing optical effects
CA2003328A1 (en) Opaque projector
JPS56167118A (en) Scanner of optical system
JPS5350852A (en) Half tone image forming optical system
JPS5313921A (en) Image observation device
JPS5677865A (en) Optical reflection system
JPS5772159A (en) Optical device for transparent original
JPS5788404A (en) Optical switch
SU414563A1 (en) KNOT OF EXPOSURE OF ELECTROPHOTOGRAPHIC APPARATUS
JPS57202517A (en) Image pickup device
JPS55126263A (en) Variable magnification optical device
JPS57147625A (en) Optical scanner
JPS56168678A (en) Projection observing and copying device
JPS576822A (en) Erecting real image type mirror lens
JPS56155932A (en) Picture forming device
JPS5614782A (en) Image pickup lens system
JPS57104867A (en) Electromagnetic oscillograph
JPS57148738A (en) Copying machine
JPS56168618A (en) Reflection type optical control system
GB768036A (en) Improvements in or relating to optical beam splitting or combining systems