FR1221044A - Automatic shutter mechanism for dark rooms - Google Patents

Automatic shutter mechanism for dark rooms

Info

Publication number
FR1221044A
FR1221044A FR784755A FR784755A FR1221044A FR 1221044 A FR1221044 A FR 1221044A FR 784755 A FR784755 A FR 784755A FR 784755 A FR784755 A FR 784755A FR 1221044 A FR1221044 A FR 1221044A
Authority
FR
France
Prior art keywords
shutter mechanism
automatic shutter
dark rooms
rooms
dark
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
FR784755A
Other languages
French (fr)
Inventor
John Winston Lothrop
Edward Mills Purcell
Sidney Boyden Whittier
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.)
Polaroid Corp
Original Assignee
Polaroid Corp
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 Polaroid Corp filed Critical Polaroid Corp
Application granted granted Critical
Publication of FR1221044A publication Critical patent/FR1221044A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/083—Analogue circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR784755A 1958-01-27 1959-01-22 Automatic shutter mechanism for dark rooms Expired FR1221044A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1221044XA 1958-01-27 1958-01-27

Publications (1)

Publication Number Publication Date
FR1221044A true FR1221044A (en) 1960-05-30

Family

ID=22400629

Family Applications (1)

Application Number Title Priority Date Filing Date
FR784755A Expired FR1221044A (en) 1958-01-27 1959-01-22 Automatic shutter mechanism for dark rooms

Country Status (1)

Country Link
FR (1) FR1221044A (en)

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