CH458914A - Automatic brightness correction device for slide or film projector - Google Patents

Automatic brightness correction device for slide or film projector

Info

Publication number
CH458914A
CH458914A CH751367A CH751367A CH458914A CH 458914 A CH458914 A CH 458914A CH 751367 A CH751367 A CH 751367A CH 751367 A CH751367 A CH 751367A CH 458914 A CH458914 A CH 458914A
Authority
CH
Switzerland
Prior art keywords
slide
correction device
brightness correction
automatic brightness
film projector
Prior art date
Application number
CH751367A
Other languages
French (fr)
Inventor
Siegrist Bruno
Wakker Charles
Original Assignee
Analix S A
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 Analix S A filed Critical Analix S A
Priority to CH751367A priority Critical patent/CH458914A/en
Priority to DE19671572559 priority patent/DE1572559A1/en
Publication of CH458914A publication Critical patent/CH458914A/en

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/081—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by measuring the incident light
    • 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
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
CH751367A 1967-05-29 1967-05-29 Automatic brightness correction device for slide or film projector CH458914A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CH751367A CH458914A (en) 1967-05-29 1967-05-29 Automatic brightness correction device for slide or film projector
DE19671572559 DE1572559A1 (en) 1967-05-29 1967-11-10 Device for the automatic correction of the light intensity of projection apparatus for slides and cinema films

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH751367A CH458914A (en) 1967-05-29 1967-05-29 Automatic brightness correction device for slide or film projector

Publications (1)

Publication Number Publication Date
CH458914A true CH458914A (en) 1968-06-30

Family

ID=4326312

Family Applications (1)

Application Number Title Priority Date Filing Date
CH751367A CH458914A (en) 1967-05-29 1967-05-29 Automatic brightness correction device for slide or film projector

Country Status (2)

Country Link
CH (1) CH458914A (en)
DE (1) DE1572559A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064723A1 (en) * 1981-05-12 1982-11-17 Riso Kagaku Corporation Reflecting type overhead projector with automatically variable safety illumination

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822849A1 (en) * 1988-07-06 1990-01-11 Josef Weber Arrangement for preventing still projectors from overheating

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0064723A1 (en) * 1981-05-12 1982-11-17 Riso Kagaku Corporation Reflecting type overhead projector with automatically variable safety illumination

Also Published As

Publication number Publication date
DE1572559A1 (en) 1970-02-19

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