GB1291810A - Improvements in and relating to optical projection apparatus - Google Patents

Improvements in and relating to optical projection apparatus

Info

Publication number
GB1291810A
GB1291810A GB2175872A GB2175872A GB1291810A GB 1291810 A GB1291810 A GB 1291810A GB 2175872 A GB2175872 A GB 2175872A GB 2175872 A GB2175872 A GB 2175872A GB 1291810 A GB1291810 A GB 1291810A
Authority
GB
United Kingdom
Prior art keywords
mirrors
projection apparatus
dec
right eye
relating
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.)
Expired
Application number
GB2175872A
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
Publication of GB1291810A publication Critical patent/GB1291810A/en
Expired 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
    • G03B35/00—Stereoscopic photography
    • G03B35/18—Stereoscopic photography by simultaneous viewing
    • G03B35/20—Stereoscopic photography by simultaneous viewing using two or more projectors
    • 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
    • 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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Abstract

1291810 Stereoscopic projection apparatus RICOH K K 15 Dec 1969 [30 Dec 1968] 21758/72 Divided out of 1290892 Heading G2A Stereoscopic projection is provided by securing first and second projectors 44, 47 to a chair 41 on either side of an observer, the upwardly directed projection beams being thrown forward on to a reflex projection screen by mirrors 42, 45 so that the observer sees left and right eye images with left and right eye respectively using the naked eyes. Half-ring mirrors may replace mirrors 42, 45 in which case each light-source comprises a half-toroidal mirror and a similarly shaped condenser lens.
GB2175872A 1968-12-30 1969-12-15 Improvements in and relating to optical projection apparatus Expired GB1291810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11470668U JPS4724425Y1 (en) 1968-12-30 1968-12-30

Publications (1)

Publication Number Publication Date
GB1291810A true GB1291810A (en) 1972-10-04

Family

ID=14644568

Family Applications (2)

Application Number Title Priority Date Filing Date
GB1290892D Expired GB1290892A (en) 1968-12-30 1969-12-15
GB2175872A Expired GB1291810A (en) 1968-12-30 1969-12-15 Improvements in and relating to optical projection apparatus

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB1290892D Expired GB1290892A (en) 1968-12-30 1969-12-15

Country Status (3)

Country Link
JP (1) JPS4724425Y1 (en)
FR (1) FR2027379A1 (en)
GB (2) GB1290892A (en)

Also Published As

Publication number Publication date
DE1964787B2 (en) 1972-10-12
DE1964787A1 (en) 1970-07-16
JPS4724425Y1 (en) 1972-08-02
GB1290892A (en) 1972-09-27
FR2027379A1 (en) 1970-09-25

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee