GB1333780A - Optical arrangements - Google Patents

Optical arrangements

Info

Publication number
GB1333780A
GB1333780A GB6152770A GB6152770A GB1333780A GB 1333780 A GB1333780 A GB 1333780A GB 6152770 A GB6152770 A GB 6152770A GB 6152770 A GB6152770 A GB 6152770A GB 1333780 A GB1333780 A GB 1333780A
Authority
GB
United Kingdom
Prior art keywords
lens
original
assembly
reflecting
layer
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
GB6152770A
Other languages
English (en)
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 GB1333780A publication Critical patent/GB1333780A/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
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Optical Elements Other Than Lenses (AREA)
GB6152770A 1970-01-07 1970-12-29 Optical arrangements Expired GB1333780A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP212670A JPS4927295B1 (enrdf_load_stackoverflow) 1970-01-07 1970-01-07

Publications (1)

Publication Number Publication Date
GB1333780A true GB1333780A (en) 1973-10-17

Family

ID=11520633

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6152770A Expired GB1333780A (en) 1970-01-07 1970-12-29 Optical arrangements

Country Status (2)

Country Link
JP (1) JPS4927295B1 (enrdf_load_stackoverflow)
GB (1) GB1333780A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113238453A (zh) * 2021-05-24 2021-08-10 青岛海信激光显示股份有限公司 一种投影屏幕及投影系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113238453A (zh) * 2021-05-24 2021-08-10 青岛海信激光显示股份有限公司 一种投影屏幕及投影系统

Also Published As

Publication number Publication date
JPS4927295B1 (enrdf_load_stackoverflow) 1974-07-16

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Legal Events

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