GB1177578A - Improvements in and relating to Arrangements for Moving an at least Partially Reflecting Sheet into a Predetermined Position. - Google Patents

Improvements in and relating to Arrangements for Moving an at least Partially Reflecting Sheet into a Predetermined Position.

Info

Publication number
GB1177578A
GB1177578A GB4934367A GB4934367A GB1177578A GB 1177578 A GB1177578 A GB 1177578A GB 4934367 A GB4934367 A GB 4934367A GB 4934367 A GB4934367 A GB 4934367A GB 1177578 A GB1177578 A GB 1177578A
Authority
GB
United Kingdom
Prior art keywords
parts
servomotor
photo
arrangements
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
GB4934367A
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 GB1177578A publication Critical patent/GB1177578A/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)
  • Optical Measuring Cells (AREA)
  • Focusing (AREA)
  • Projection Apparatus (AREA)

Abstract

1,177,578. Photo-electric transparency positioning arrangement. ERNST LEITZ G.m.b.H. Oct. 31, 1967 [Nov.5, 1966], No.49343/67. Heading G1A. In an arrangement for automatically positioning by means of a servomotor 22 a glass sandwiched slide 5 in a projector, a slit of light from a source 7 is directed obliquely on to a face of the slide and the reflections from the several faces are detected by photo-electric means having two parts 11, 12, the evaluating action of the separate parts being made different by for example a mask or translucent material to reduce the effect of the stronger reflections from the first and second surfaces encountered by the incident beam, and unbalance in the signals developed by the respective parts being used to control the servomotor. The photoelectric means may comprise a single cell or two separate cells, and one of the parts or cells may be of a different resistance from the other as an alternative to masking. Slit widths are discussed.
GB4934367A 1966-11-05 1967-10-31 Improvements in and relating to Arrangements for Moving an at least Partially Reflecting Sheet into a Predetermined Position. Expired GB1177578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL0054998 1966-11-05

Publications (1)

Publication Number Publication Date
GB1177578A true GB1177578A (en) 1970-01-14

Family

ID=7276605

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4934367A Expired GB1177578A (en) 1966-11-05 1967-10-31 Improvements in and relating to Arrangements for Moving an at least Partially Reflecting Sheet into a Predetermined Position.

Country Status (2)

Country Link
DE (1) DE1472300B2 (en)
GB (1) GB1177578A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4415244A (en) * 1982-03-22 1983-11-15 Telex Communications, Inc. Automatic focusing system

Also Published As

Publication number Publication date
DE1472300A1 (en) 1969-03-20
DE1472300B2 (en) 1970-06-25

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