GB1211135A - Improvements relating to optical projectors - Google Patents

Improvements relating to optical projectors

Info

Publication number
GB1211135A
GB1211135A GB230468A GB230468A GB1211135A GB 1211135 A GB1211135 A GB 1211135A GB 230468 A GB230468 A GB 230468A GB 230468 A GB230468 A GB 230468A GB 1211135 A GB1211135 A GB 1211135A
Authority
GB
United Kingdom
Prior art keywords
improvements relating
optical projectors
jan
positions
projectors
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
GB230468A
Inventor
Ronald Max Ford
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
Priority to GB230468A priority Critical patent/GB1211135A/en
Publication of GB1211135A publication Critical patent/GB1211135A/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
    • 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
    • G03B21/08—Projectors or projection-type viewers; Accessories therefor affording epidiascopic projection

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Telescopes (AREA)

Abstract

1,211,135. Overhead projectors. FRANK F. FORD Ltd. Jan.13, 1969 [Jan.16, 1968], No.2304/68. Heading G2A. An overhead projector has a lens element which may be attached to the projection head 13 in either of two positions to provide a choice of two focal lengths for the projection lens system. Lugs 19, 20 and tracks 22 provide support for the element in the two positions. Application to an epidiascope is mentioned.
GB230468A 1968-01-16 1968-01-16 Improvements relating to optical projectors Expired GB1211135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB230468A GB1211135A (en) 1968-01-16 1968-01-16 Improvements relating to optical projectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB230468A GB1211135A (en) 1968-01-16 1968-01-16 Improvements relating to optical projectors

Publications (1)

Publication Number Publication Date
GB1211135A true GB1211135A (en) 1970-11-04

Family

ID=9737210

Family Applications (1)

Application Number Title Priority Date Filing Date
GB230468A Expired GB1211135A (en) 1968-01-16 1968-01-16 Improvements relating to optical projectors

Country Status (1)

Country Link
GB (1) GB1211135A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees