CH458914A - Automatic brightness correction device for slide or film projector - Google Patents
Automatic brightness correction device for slide or film projectorInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
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)
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)
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 |
-
1967
- 1967-05-29 CH CH751367A patent/CH458914A/en unknown
- 1967-11-10 DE DE19671572559 patent/DE1572559A1/en active Pending
Cited By (1)
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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