GB1259495A - - Google Patents
Info
- Publication number
- GB1259495A GB1259495A GB1259495DA GB1259495A GB 1259495 A GB1259495 A GB 1259495A GB 1259495D A GB1259495D A GB 1259495DA GB 1259495 A GB1259495 A GB 1259495A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electromagnet
- shutter
- lever
- pawl
- biased
- 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
- G03B7/083—Analogue circuits for control of exposure time
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Shutters For Cameras (AREA)
- Shutter-Related Mechanisms (AREA)
Abstract
1,259,495. Electromagnet shutter control. PENTACON DRESDEN KAMERA UND KINOWERKE VEB. March 11, 1969, No.12701/69. Heading G2A. A lever 2 is pivoted at 1 to control the operation of a shutter opening member 7 and a shutter closing member 8, the lever being biased into the initial position, shown in full outline, by a spring 6, and being biased into the shutter holding position, shown in broken outline by the attraction between an electromagnet 5 and a permanent magnet 4. At the end of the exposure period, as determined by a timing circuit sensitive to ambient illumination, the polarity of the electromagnet is reversed to repel the permanent magnet 4. In the rest position, member 8 is held by a pawl (11) Fig.2 (not shown). Upon movement of member 7 a pin (12) contacts the pawl (11) so that member 8 is blocked by lever 2. The electromagnet preferably has two windings, wound in opposite directions, which can be switched in and out alternately by transistors (14), (15), Fig.3 (not shown). In an alternative arrangement, Fig.4 (not shown), the armature consists of an electromagnet having an armature (18) and a fixed electromagnet (19) connected to the control circuitry.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1270169 | 1969-03-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1259495A true GB1259495A (en) | 1972-01-05 |
Family
ID=10009519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1259495D Expired GB1259495A (en) | 1969-03-11 | 1969-03-11 |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1259495A (en) |
-
1969
- 1969-03-11 GB GB1259495D patent/GB1259495A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |