GB1272207A - Overhead projector - Google Patents

Overhead projector

Info

Publication number
GB1272207A
GB1272207A GB2553670A GB2553670A GB1272207A GB 1272207 A GB1272207 A GB 1272207A GB 2553670 A GB2553670 A GB 2553670A GB 2553670 A GB2553670 A GB 2553670A GB 1272207 A GB1272207 A GB 1272207A
Authority
GB
United Kingdom
Prior art keywords
housing
overhead projector
lens
writing
ritzerfeld
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
GB2553670A
Inventor
Gerhard Ritzerfeld
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1272207A publication Critical patent/GB1272207A/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)
  • Projection Apparatus (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

1,272,207. Overhead projectors. G. RITZERFELD. May 27, 1970 [March 2, 1970], No.25536/70. Heading G2A. A writing projector comprises a light source 11 within a housing 1 upon which are mounted a detachable transparent writing plate over a Fresnel lens 4 carried in a stirrup 5 pivoted to housing 1 by pins 7 whereby the lens 4 may be raised for cleaning.
GB2553670A 1970-03-02 1970-05-27 Overhead projector Expired GB1272207A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19707008118 DE7008118U (en) 1970-03-02 1970-03-02 WRITING PROJECTOR

Publications (1)

Publication Number Publication Date
GB1272207A true GB1272207A (en) 1972-04-26

Family

ID=6609946

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2553670A Expired GB1272207A (en) 1970-03-02 1970-05-27 Overhead projector

Country Status (2)

Country Link
DE (1) DE7008118U (en)
GB (1) GB1272207A (en)

Also Published As

Publication number Publication date
DE7008118U (en) 1970-07-16

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