GB1275650A - Exposure and shutter control systems for cameras - Google Patents
Exposure and shutter control systems for camerasInfo
- Publication number
- GB1275650A GB1275650A GB3434269A GB3434269A GB1275650A GB 1275650 A GB1275650 A GB 1275650A GB 3434269 A GB3434269 A GB 3434269A GB 3434269 A GB3434269 A GB 3434269A GB 1275650 A GB1275650 A GB 1275650A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- electromagnet
- pulse
- energizes
- scr
- 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)
Abstract
1275650 Photographic exposure control ASAHI KOGAKU KOGYO K K 8 July 1969 [12 July 1968] 34342/69 Heading G2A [Also in Division H3] A photo-conductor controls the charging of a capacitor, and a uni-junction transistor discharges the capacitor whenever the voltage across the capacitor reaches a predetermined level. This produces a train of pulses, one pulse controlling shutter opening and the or a succeeding pulse controlling shutter closing. As shown in Fig.3, capacitor 2, 2<SP>1</SP> or 2<SP>11</SP> is selected according to film sensitivity and aperture setting, is charged through a photo-conductor 1 and discharges through a transistor 3. The first pulse fires an SCR 8 which energizes an electromagnet 14. Electromagnet 14 opens the shutter (not shown) and also opens a switch 14 to allow the second pulse to fire an SCR 12. This energizes a shutterclosing electromagnet 10. Similar circuits are shown in Figs. 4 and 5, the latter including a log converting circuit (19) memory capacitor (21) and field effect transistor (22) for use with SLR cameras.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4844168 | 1968-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1275650A true GB1275650A (en) | 1972-05-24 |
Family
ID=12803425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3434269A Expired GB1275650A (en) | 1968-07-12 | 1969-07-08 | Exposure and shutter control systems for cameras |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1275650A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2951128A1 (en) * | 1979-01-04 | 1980-07-17 | Rollei Werke Franke Heidecke | METHOD FOR CONVERTING RECEIVED LIGHT INTO DIGITAL IMPULSE SIGNALS AND DEVICE FOR IMPLEMENTING THE METHOD |
| US4297011A (en) | 1979-05-10 | 1981-10-27 | Rollei Of America, Inc. | Photoflash device |
-
1969
- 1969-07-08 GB GB3434269A patent/GB1275650A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2951128A1 (en) * | 1979-01-04 | 1980-07-17 | Rollei Werke Franke Heidecke | METHOD FOR CONVERTING RECEIVED LIGHT INTO DIGITAL IMPULSE SIGNALS AND DEVICE FOR IMPLEMENTING THE METHOD |
| US4297011A (en) | 1979-05-10 | 1981-10-27 | Rollei Of America, Inc. | Photoflash device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee | ||
| PCNP | Patent ceased through non-payment of renewal fee |