GB1273427A - Variable diaphragm device - Google Patents
Variable diaphragm deviceInfo
- Publication number
- GB1273427A GB1273427A GB3740469A GB3740469A GB1273427A GB 1273427 A GB1273427 A GB 1273427A GB 3740469 A GB3740469 A GB 3740469A GB 3740469 A GB3740469 A GB 3740469A GB 1273427 A GB1273427 A GB 1273427A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vane
- coil
- diaphragm
- pointer
- july
- 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
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
- G03B7/085—Analogue circuits for control of aperture
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Diaphragms For Cameras (AREA)
Abstract
1,273,427. Variable diaphragms. EASTMAN KODAK CO. July 25, 1969 [July 30, 1968], No.37404/69. Heading G2A. In order to limit the amount of light passing through the lens of a camera without using an excessively small diaphragm aperture, a filter mounted at the end of a masking arm is interposed in the light path. As shown, the diaphragm consists of a single vane 3 having a tapered opening. The vane is coupled to a pointer 6 and a coil 7, the coil forming part of a photo-electric lightmeasuring device, so that coil, pointer, and vane all move together. As the tapered opening moves across the exposure aperture 4 of the camera, the amount of light which can enter is varied accordingly. A masking member 5, whose movement about a pivot 11 is controlled by a button 9, cooperates with the diaphragm opening to define the exposure area, and the tip of the member 5 carries a small neutral density filter 10.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74879468A | 1968-07-30 | 1968-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1273427A true GB1273427A (en) | 1972-05-10 |
Family
ID=25010957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3740469A Expired GB1273427A (en) | 1968-07-30 | 1969-07-25 | Variable diaphragm device |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1938417A1 (en) |
| FR (1) | FR2014001A1 (en) |
| GB (1) | GB1273427A (en) |
-
1969
- 1969-07-25 GB GB3740469A patent/GB1273427A/en not_active Expired
- 1969-07-29 DE DE19691938417 patent/DE1938417A1/en active Pending
- 1969-07-30 FR FR6926001A patent/FR2014001A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE1938417A1 (en) | 1970-02-19 |
| FR2014001A1 (en) | 1970-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |