Patent US3756131A successfully refreshed from Google Patents.
US3756131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure controlling device for photographic camera
Assignee: Minolta Co Ltd
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Filing: 1971-06-04
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Granted: 1973-09-04
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Expires: 1991-06-04
Abstract
Abstract An exposure control circuit is caused to store a voltage representative of the light intensity of a selected principal object within the object field to be photographed by a manually operated member which disconnects a photosensitive element from a capacitive storage element. Operation of the manual member causes a switch interconnecting the photosensitive element with the capacitive storage element to be opened and a restraining member is provided for maintaining the switch in an opened condition until an exposure has been terminated. A cocking member operated in conjunction with the cocking of the camera causes the switch to be closed in preparation for another photograph.
Inventors
- 👤 Y Kuramoto
- 👤 K Tsujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:28
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
An exposure controlling device for a photographic camera comprising: a photoseNsitive element for receiving light from a selected object with an object field to be photographed and generating an output representative thereof; a capacitor for storing a voltage in accordance with said output; first switch means for connecting said capacitor to said photosensitive element; shutter exposure mechanism actuated by the camera shutter release mechanism; a shutter control circuit for controlling said shutter exposure mechanism to obtain an exposure in response to the stored voltage of said capacitor; and a manually operative means actuated independently of said shutter release mechanism solely for opening said first switch means prior to a shutter release operation.
Claim 2
Dependent Claim
112 words
An exposure controlling device for a photographic camera comprising: a photoseNsitive element for receiving light from a selected object with an object field to be photographed and generating an output representative thereof; a capacitor for storing a voltage in accordance with said output; first switch means for connecting said capacitor to said photosensitive element; shutter exposure mechanism actuated by the camera shutter release mechanism; a shutter control circuit for controlling said shutter exposure mechanism to obtain an exposure in response to the stored voltage of said capacitor; and a manually operative means actuated independently of said shutter release mechanism solely for opening said first switch means prior to a shutter release operation.
Claim 3
Dependent Claim
25 words
An exposure controlling device as in claim 1, further comprising, means for preventing closure of said first switch means opened by said manually operative means.
Claim 4
Dependent Claim
35 words
An exposure controlling device as in claim 2 wherein said camera further comprises means for releasing said means for preventing closure of said first switch means interlocked with the operation of said shutter exposure mechanism.
Claim 5
Dependent Claim
141 words
An exposure controlling device for a single lens reflex camera having a movable reflector, comprising: a photosensitive element for receiving light rays passing through the objective lens of said camera and reflected by said movable reflector; a capacitor for storing photometric data connected in parallel with said photosensitive element; first switch means for connecting said capacitor to said photosensitive element; a shutter control circuit for controlling an exposure in response to the voltage stored by said capacitor; a manually operative means for opening said first switch means prior to a shutter release operation; a shutter release mechanism; a second switch means serially connected with said first switch means between said capacitor and said photosensitive element; and means for automatically opening said second switch means before movement of said movable reflector in interlocking relationship with the starting of said shutter release mechanism.
Claim 6
Dependent Claim
141 words
An exposure controlling device for a single lens reflex camera having a movable reflector, comprising: a photosensitive element for receiving light rays passing through the objective lens of said camera and reflected by said movable reflector; a capacitor for storing photometric data connected in parallel with said photosensitive element; first switch means for connecting said capacitor to said photosensitive element; a shutter control circuit for controlling an exposure in response to the voltage stored by said capacitor; a manually operative means for opening said first switch means prior to a shutter release operation; a shutter release mechanism; a second switch means serially connected with said first switch means between said capacitor and said photosensitive element; and means for automatically opening said second switch means before movement of said movable reflector in interlocking relationship with the starting of said shutter release mechanism.
Claim 7
Dependent Claim
124 words
An exposure controlling device for a single lens reflex camera having a movable reflector, comprising: a photosensitive element for receiving light rays passing through the objective lens of said camera reflected from said movable reflector; a capacitor for storing photometric data connected in parallel with said photosensitive element via a connecting switch; a shutter control circuit responsive to the voltage charged on said capacitor; a push button for manually opening said connecting switch; a means for automatically opening said connecting switch before movement of said movable reflector in interlocking relationship with the shutter release operation; a member for restraining said connecting switch in the opening state; and a means for releasing said restraining member in interlocking relationship with the closing operation of the shutter.
Claim 8
Dependent Claim
124 words
An exposure controlling device for a single lens reflex camera having a movable reflector, comprising: a photosensitive element for receiving light rays passing through the objective lens of said camera reflected from said movable reflector; a capacitor for storing photometric data connected in parallel with said photosensitive element via a connecting switch; a shutter control circuit responsive to the voltage charged on said capacitor; a push button for manually opening said connecting switch; a means for automatically opening said connecting switch before movement of said movable reflector in interlocking relationship with the shutter release operation; a member for restraining said connecting switch in the opening state; and a means for releasing said restraining member in interlocking relationship with the closing operation of the shutter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |