GB1203128A - A device for the automatic focusing of slide projectors - Google Patents

A device for the automatic focusing of slide projectors

Info

Publication number
GB1203128A
GB1203128A GB5276268A GB5276268A GB1203128A GB 1203128 A GB1203128 A GB 1203128A GB 5276268 A GB5276268 A GB 5276268A GB 5276268 A GB5276268 A GB 5276268A GB 1203128 A GB1203128 A GB 1203128A
Authority
GB
United Kingdom
Prior art keywords
slide
focusing
focused
automatic focusing
nov
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
GB5276268A
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.)
Ernst Leitz Wetzlar GmbH
Original Assignee
Ernst Leitz Wetzlar GmbH
Ernst Leitz GmbH
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 Ernst Leitz Wetzlar GmbH, Ernst Leitz GmbH filed Critical Ernst Leitz Wetzlar GmbH
Publication of GB1203128A publication Critical patent/GB1203128A/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
    • G03B21/14—Details
    • G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)

Abstract

1,203,128. Slide projectors; focusing. ERNST LEITZ G.m.b.H. Nov. 7, 1968 [Nov.18, 1967], No.52762/68. Heading G2A. [Also in Division G1] An automatic focusing device for slide projectors comprises an optical system which directs a beam 4 of light for reflection by a slide 7 on to a double photo-electric cell 16 in a differential circuit for controlling the focusing of the slide, a double field lens 13 splitting the beam into two separate beams. Reversible motor 19 in the differential circuit drives rack and pinion focusing devices 20, 21, until the reflected beam falls on the dividing line of the lenses 13a, 13b, the slide then being focused. Surfaces 15a, 15b, completely certain the split beams 4a which may be focused or non-focused.
GB5276268A 1967-11-18 1968-11-07 A device for the automatic focusing of slide projectors Expired GB1203128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0046079 1967-11-18

Publications (1)

Publication Number Publication Date
GB1203128A true GB1203128A (en) 1970-08-26

Family

ID=7271440

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5276268A Expired GB1203128A (en) 1967-11-18 1968-11-07 A device for the automatic focusing of slide projectors

Country Status (1)

Country Link
GB (1) GB1203128A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445512A1 (en) * 1978-12-27 1980-07-25 Thomson Csf Position detecting system for image forming appts. - includes two part photodiode providing two signals with difference proportional to position error
JPS5752008A (en) * 1981-06-17 1982-03-27 Canon Inc Distance detector
EP0083413A1 (en) * 1981-12-31 1983-07-13 International Business Machines Corporation Autofocus arrangement for electron-beam lithographic systems
US5078487A (en) * 1984-11-19 1992-01-07 Canon Kabushiki Kaisha Projecting apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2445512A1 (en) * 1978-12-27 1980-07-25 Thomson Csf Position detecting system for image forming appts. - includes two part photodiode providing two signals with difference proportional to position error
JPS5752008A (en) * 1981-06-17 1982-03-27 Canon Inc Distance detector
EP0083413A1 (en) * 1981-12-31 1983-07-13 International Business Machines Corporation Autofocus arrangement for electron-beam lithographic systems
US5078487A (en) * 1984-11-19 1992-01-07 Canon Kabushiki Kaisha Projecting apparatus

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Legal Events

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