JPS6450037A - Reflection type enlarging and projecting device - Google Patents

Reflection type enlarging and projecting device

Info

Publication number
JPS6450037A
JPS6450037A JP62207317A JP20731787A JPS6450037A JP S6450037 A JPS6450037 A JP S6450037A JP 62207317 A JP62207317 A JP 62207317A JP 20731787 A JP20731787 A JP 20731787A JP S6450037 A JPS6450037 A JP S6450037A
Authority
JP
Japan
Prior art keywords
screen
projected
reflected
incident side
polarization plate
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.)
Granted
Application number
JP62207317A
Other languages
Japanese (ja)
Other versions
JP2565918B2 (en
Inventor
Kenya Yokoi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62207317A priority Critical patent/JP2565918B2/en
Priority to US07/091,668 priority patent/US4818074A/en
Priority to GB8720627A priority patent/GB2196165B/en
Priority to DE19873729512 priority patent/DE3729512C2/en
Publication of JPS6450037A publication Critical patent/JPS6450037A/en
Application granted granted Critical
Publication of JP2565918B2 publication Critical patent/JP2565918B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Liquid Crystal (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

PURPOSE:To attain the uniformity of the contrast of an entire screen by projecting and displaying an image in a state where reflected light corresponding to a heat spot, which occupies for the most part, is not projected on the screen. CONSTITUTION:A light beam lighted by a light source for lighting 11 and pass ing through a transmission type liquid crystal cell 1 is reflected by the reflecting film 8 of a Fresnel reflecting plate 9 and radiated from a polarization plate 5 on an incident side, then it is enlarged to be projected on the screen by a projecting optical system 14. At such a time, a projected spot image 16 which is reflected from the part of the heat spot 15 formed on a protecting cover 10 and the polarization plate 5 on the incident side is not reflected into the optical path of the projecting optical system 14 since the protecting cover 10 and the polarization plate 5 on the incident side are inclined. Then, the projected spot image 16 corresponding to the heat spot 15 does not appear on the screen. Thus, the contrast is uniformized all over the screen.
JP62207317A 1986-09-03 1987-08-20 Reflective magnifying projector Expired - Lifetime JP2565918B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP62207317A JP2565918B2 (en) 1987-08-20 1987-08-20 Reflective magnifying projector
US07/091,668 US4818074A (en) 1986-09-03 1987-09-01 Projection device for irradiating a light to a display device and optically magnifying and projecting a reflection light therefrom
GB8720627A GB2196165B (en) 1986-09-03 1987-09-02 A projection device
DE19873729512 DE3729512C2 (en) 1986-09-03 1987-09-03 Projection device for the representation and enlargement of images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62207317A JP2565918B2 (en) 1987-08-20 1987-08-20 Reflective magnifying projector

Publications (2)

Publication Number Publication Date
JPS6450037A true JPS6450037A (en) 1989-02-27
JP2565918B2 JP2565918B2 (en) 1996-12-18

Family

ID=16537767

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62207317A Expired - Lifetime JP2565918B2 (en) 1986-09-03 1987-08-20 Reflective magnifying projector

Country Status (1)

Country Link
JP (1) JP2565918B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04155323A (en) * 1990-10-18 1992-05-28 Elmo Co Ltd Reflection type overhead projector
JPH0553090A (en) * 1991-08-29 1993-03-05 Fujitsu Ltd Projection type display device
JPH0659234A (en) * 1992-08-06 1994-03-04 Fujitsu Ltd Projection type liquid crystal display
US5975704A (en) * 1997-01-10 1999-11-02 In Focus Systems, Inc. Multimedia projection system with image quality correction

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04155323A (en) * 1990-10-18 1992-05-28 Elmo Co Ltd Reflection type overhead projector
JPH0553090A (en) * 1991-08-29 1993-03-05 Fujitsu Ltd Projection type display device
JPH0659234A (en) * 1992-08-06 1994-03-04 Fujitsu Ltd Projection type liquid crystal display
US5975704A (en) * 1997-01-10 1999-11-02 In Focus Systems, Inc. Multimedia projection system with image quality correction

Also Published As

Publication number Publication date
JP2565918B2 (en) 1996-12-18

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Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term