GB968932A - An improved photographic flash device - Google Patents

An improved photographic flash device

Info

Publication number
GB968932A
GB968932A GB?2844/62A GB284462A GB968932A GB 968932 A GB968932 A GB 968932A GB 284462 A GB284462 A GB 284462A GB 968932 A GB968932 A GB 968932A
Authority
GB
United Kingdom
Prior art keywords
switch
bulb
flash
cell
resistor
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
GB?2844/62A
Inventor
Miller Reese Hutchison
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to GB?2844/62A priority Critical patent/GB968932A/en
Publication of GB968932A publication Critical patent/GB968932A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
    • F21V23/0414—Arrangement of electric circuit elements in or on lighting devices the elements being switches specially adapted to be used with portable lighting devices
    • 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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

968, 932. Photographic flash guns. EASTMAN KODAK CO. June 13, 1963 [June 14, 1962], No. 22844/62. Heading G2A. A photographic flash gun comprises a flashlamp holder connectable to a source, of energization, a switching device in circuit with the holder and source of energization, and a photo-electric device adapted to be illuminated by field light which controls the switching device. As shown, a camera has an optical axis 10 on which are located aperture 12 and shutter blade 14, the blade being actuated by lever 16. A flash bulb 20 mounted in front of reflector 22 is in series with a battery 24, a switch 26, a shutter timing switch 28, and a gated switch 30. The switch 30 may be a silicon rectifier having a gating input 32. A resistor 34 and light dependent resistor 36, e.g., a cadmium sulphide cell is in parallel with bulb 20. Switch 26 is closed by actuation of lever 16 which actuates the shutter which in turn closes switch 28. Should the scene brightness be sufficiently high the resistance of cell 36 is low and switch 30 is non-conducting, thus preventing current flow through the bulb 20 and flash operation. If the scene brightness is low, the resistance of cell 36 is high, such that switch 30 is conducting, thereby permitting current flow through flash bulb 20. In another embodiment, Fig. 3, not shown, a rheostat 44 replaces resistor 34, Fig. 2., and may be adjusted according to a scale 45 of exposure factors.
GB?2844/62A 1962-06-14 1962-06-14 An improved photographic flash device Expired GB968932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB?2844/62A GB968932A (en) 1962-06-14 1962-06-14 An improved photographic flash device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB?2844/62A GB968932A (en) 1962-06-14 1962-06-14 An improved photographic flash device

Publications (1)

Publication Number Publication Date
GB968932A true GB968932A (en) 1964-09-09

Family

ID=9747036

Family Applications (1)

Application Number Title Priority Date Filing Date
GB?2844/62A Expired GB968932A (en) 1962-06-14 1962-06-14 An improved photographic flash device

Country Status (1)

Country Link
GB (1) GB968932A (en)

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