GB878153A - Improvements in or relating to photographic cameras - Google Patents
Improvements in or relating to photographic camerasInfo
- Publication number
- GB878153A GB878153A GB182/58A GB18258A GB878153A GB 878153 A GB878153 A GB 878153A GB 182/58 A GB182/58 A GB 182/58A GB 18258 A GB18258 A GB 18258A GB 878153 A GB878153 A GB 878153A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cage
- camera
- shutter speed
- diaphragm aperture
- scale
- 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
- G03B7/04—Control effected by hand adjustment of a member that senses indication of a pointer of a built- in light-sensitive device, e.g. by restoring point to a fixed associated reference mark
- G03B7/06—Control effected by hand adjustment of a member that senses indication of a pointer of a built- in light-sensitive device, e.g. by restoring point to a fixed associated reference mark by a follow-up movement of an associated reference mark to the pointer
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Retarders (AREA)
- Exposure Control For Cameras (AREA)
Abstract
878,153. Photographic cameras DECKEL, H., and DECKEL, F. W. Jan. 2, 1958 [Jan. 12, 1957; May 17, 1957; Sept. 27, 1957], No. 182/58. Class 98(1) In a photographic camera, the shutter speed and diaphragm aperture are set by actuation of the sun wheels of a differential gear, the cage of which is rotatably coaxial with the optical axis of the camera and carries a planet wheel rotatable about an axis perpendicular to the optical axis. Preferably, the camera is provided with a built-in photo-electric exposure meter having a follower operatively connected to the cage of the differential. As shown, a sun wheel 24 is connected by arm 26 to a shutter speed adjusting ring 27 carrying an index 74 which reads on a stationary shutter speed scale 72. Sun wheel 30 is connected to iris diaphragm blades 20 and depth of field pointers 32. The diaphragm aperture is adjusted by turning cage 40 by knob 44 to bring follower 60 opposite exposure meter pointer 64 while shutter speed ring 27 is retained by a click or like releasable stop. The exposure meter is corrected for the film speed by means of releasable coupling 46, 48 and film speed scale 49. No indication of the change of diaphragm aperture except movement of pointers 32 is given. Subsequent movement of shutter speed ring 27 rotates planet wheel 38 to bring about compensating variations in the diaphragm aperture without disturbing cage 40 and follower 60. In another form, sun wheel teeth project radially inwards from shutter speed and diaphragm aperture scale rings and in an interchangeable lens mount a pinion corresponding to 52 remains on the camera while meshing inwardly directed teeth are provided on the differential cage which is carried in the lens mount. The cage is rotatable by means of a knob mounted on the camera body. As applied to a twin lens camera (Fig. 12-17, not shown), the cage is journalled on the shutter housing and the sun wheels are journalled on the cage and have internal teeth meshing with a planet wheel and external teeth meshing with scale rings rotatable about the finder objective. A pinion reverses the drive to the diaphragm aperture scale ring so that when the exposure value is invariant and the cage stationary both scale rings rotate equally in the same direction. Specification 798,038 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE878153X | 1957-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB878153A true GB878153A (en) | 1961-09-27 |
Family
ID=6818387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB182/58A Expired GB878153A (en) | 1957-01-12 | 1958-01-02 | Improvements in or relating to photographic cameras |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB878153A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112269235A (en) * | 2020-11-09 | 2021-01-26 | 中国航空工业集团公司洛阳电光设备研究所 | Iris diaphragm device for low-illumination camera and automatic iris diaphragm adjusting method |
-
1958
- 1958-01-02 GB GB182/58A patent/GB878153A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112269235A (en) * | 2020-11-09 | 2021-01-26 | 中国航空工业集团公司洛阳电光设备研究所 | Iris diaphragm device for low-illumination camera and automatic iris diaphragm adjusting method |
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