GB183492A - Improvements in and relating to cameras - Google Patents
Improvements in and relating to camerasInfo
- Publication number
- GB183492A GB183492A GB3664520A GB3664520A GB183492A GB 183492 A GB183492 A GB 183492A GB 3664520 A GB3664520 A GB 3664520A GB 3664520 A GB3664520 A GB 3664520A GB 183492 A GB183492 A GB 183492A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shutter
- spring
- focusing
- focal
- plane
- 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
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/44—Means for exchanging focusing screen and light sensitive material
Abstract
183,492. Lewis, B. Sept. 12, 1921. Focusing-devices. - Relates to focusing-arrangements for focal-plane cameras of the kind in which the focal-plane shutter forms the focusing- screen and is viewed from the front. The invention consists in means for pressing and holding the shutter against the sensitive plate during focusing, and for releasing the pressing means simultaneously with the release of the shutteroperating mechanism to make the exposure. A rectangular wire frame 17, hinged at 19 inside the camera, is displaced by an external finger-lever 20, against the action of a spring 22, to press the shutter 15 backwards into contact with the sensitive plate 16, i.e. into or approximately into, the focal plane of the camera. In this position, the lever 20 is held by a spring trigger 23, and a pivoted spring catch 25 which it carries snaps over the hooked end of a spring pawl 26 engaging the pinion 27 of the upper blind roller. To make the exposure, the trigger 23 is lifted by hand, bulb, or Bowden wire. The spring 22 withdraws the frame 17 from the shutter, and the catch 25 withdraws the pawl 26 from the pinion 27, thus releasing the shutter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3664520A GB183492A (en) | 1921-09-12 | 1921-09-12 | Improvements in and relating to cameras |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3664520A GB183492A (en) | 1921-09-12 | 1921-09-12 | Improvements in and relating to cameras |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB183492A true GB183492A (en) | 1922-08-03 |
Family
ID=10389976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3664520A Expired GB183492A (en) | 1921-09-12 | 1921-09-12 | Improvements in and relating to cameras |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB183492A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3811774A (en) * | 1972-04-20 | 1974-05-21 | Us Army | Continuous wave radar for range and velocity measurement |
| US4172650A (en) * | 1977-11-11 | 1979-10-30 | Polaroid Corporation | Film cassette having focal plane shutter |
-
1921
- 1921-09-12 GB GB3664520A patent/GB183492A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3811774A (en) * | 1972-04-20 | 1974-05-21 | Us Army | Continuous wave radar for range and velocity measurement |
| US4172650A (en) * | 1977-11-11 | 1979-10-30 | Polaroid Corporation | Film cassette having focal plane shutter |
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