US3833915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic shutter apparatus for camera
Assignee: Minolta Co Ltd
•
Filing: 1973-10-12
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Granted: 1974-09-03
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Expires: 1993-10-12
Abstract
Abstract An apparatus including a release member operable by shutter release action to shift an electromagnet and a shutter opening and closing initiating member supporting an attraction piece at its one end. While the shutter is in its cocked state, the release member holds the electromagnet pressed against the attraction piece. Energization of the electromagnet causes the shutter opening and closing initiating member to operate with the release member to initiate shutter opening action and, when the electromagnet is deenergized, the shutter opening and closing initiating member permits the shutter to close. The apparatus further includes means for detecting energization or unenergization of the electromagnet and visually indicating in the finder field that the camera is not ready for taking a photograph when the electromagnet is unenergized. At the almost final stage of travel of a shutter blind, the means further brakes the blind to prevent the blind from bouncing when the blind stops.
Inventors
- 👤 H Tanaka
- 👤 A Yoshizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58; G03B9/62; G03B9/08; G03B9/10; G03B9/16; G03B9/36; G03B9/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
236 words
An electronic shutter apparatus for a camera comprising: an electromagnet to be energized by closing a power source switch and to be deenergized under the control of an exposure time control electric circuit, an attraction piece to be held attracted to the attracting surface of the electromagnet while the electromagnet is energized, a release member for shifting the electromagnet and the attraction piece by shutter tripping action after the attraction piece has been attracted to the electromagnet by closing the power source switch for energizing the electromagnet, the release member supporting one of the electromagnet and the attraction piece and being biased in one direction to bring The electromagnet and the attraction piece mechanically into intimate contact with each other by the biasing force when the shutter is cocked in position, and a shutter opening and closing initiating member for initiating the shutter into opening and closing action, the initiating member supporting the other of the electromagnet and the attraction piece unsupported by the release member and being biased in a direction to move the electromagnet and the attraction piece away from each other, the initiating member being operable with the release member to initiate the shutter into opening action through the electromagnet and the attraction piece held attracted thereto when the electromagnet is energized, the initiating member being operable by the biasing force to initiate the shutter into closing action upon deenergization of the electromagnet.
Claim 2
Dependent Claim
236 words
An electronic shutter apparatus for a camera comprising: an electromagnet to be energized by closing a power source switch and to be deenergized under the control of an exposure time control electric circuit, an attraction piece to be held attracted to the attracting surface of the electromagnet while the electromagnet is energized, a release member for shifting the electromagnet and the attraction piece by shutter tripping action after the attraction piece has been attracted to the electromagnet by closing the power source switch for energizing the electromagnet, the release member supporting one of the electromagnet and the attraction piece and being biased in one direction to bring The electromagnet and the attraction piece mechanically into intimate contact with each other by the biasing force when the shutter is cocked in position, and a shutter opening and closing initiating member for initiating the shutter into opening and closing action, the initiating member supporting the other of the electromagnet and the attraction piece unsupported by the release member and being biased in a direction to move the electromagnet and the attraction piece away from each other, the initiating member being operable with the release member to initiate the shutter into opening action through the electromagnet and the attraction piece held attracted thereto when the electromagnet is energized, the initiating member being operable by the biasing force to initiate the shutter into closing action upon deenergization of the electromagnet.
Claim 3
Dependent Claim
30 words
The apparatus as set forth in claim 1 wherein the release member is operable upon tripping the shutter to close the power source switch and to thereafter shift the electromagnet.
Claim 4
Dependent Claim
29 words
The apparatus as set forth in claim 1 wherein after the power source switch is closed by tripping the shutter the release member is operable to shift the electromagnet.
Claim 5
Dependent Claim
49 words
The apparatus as set forth in claim 1 wherein the release member comprises a first release member operable by tripping the shutter to close the power switch and a second release member operable with the first release member after the power source switch is closed to shift the electromagnet.
Claim 6
Dependent Claim
70 words
The apparatus as set forth in claim 1 wherein the shutter opening and closing initiating member has a latch portion for latching a first shutter blind at its cocked position upon cocking the shutter and another latch portion positionable into the path of advance of a second shutter blind simultaneously when the first blind is unlatched to latch the second blind at the position where the shutter is fully opened.
Claim 7
Dependent Claim
137 words
The apparatus as set forth in claim 1 wherein the shutter opening and closing initiating member comprises a shutter opening initiating member for latching a shutter blind at its cocked position upon cocking the shutter, the shutter opening initiating member being operable with the release member when the electromagnet is energized to unlatch the shutter blind and to thereby initiate the shutter into opening action, and a shutter closing initiating member operable with the shutter opening initiating member to be positioned into the path of advance of the shutter blind upon the unlatching of the shutter blind to latch the shutter blind at the position where the shutter is fully opened, the shutter closing initiating member being operable to unlatch the shutter blind and to thereby initiate the shutter into closing action upon deenergization of the electromagnet.
Claim 8
Dependent Claim
60 words
The apparatus as set forth in claim 6 wherein the shutter closing initiating member is pivotally supported by a pin so disposed that a component of the force resulting from the latching of the shutter blind at its point of application will act in the direction to bring the electromagnet and the attraction piece into intimate contact with each other.
Claim 9
Dependent Claim
38 words
The apparatus as set forth in claim 1 further comprising indicating means for detecting whether the electromagnet is energized or unenergized to visually indicate in a finder field that the shutter is inoperative when the electromagnet is unenergized.
Claim 10
Dependent Claim
76 words
The apparatus as set forth in claim 8 wherein the indicating means includes an indicating member having a detecting portion to be positioned into a gap formed between the electromagnet and the attraction piece when the attraction piece is not attracted by the electromagnet upon tripping the shutter to place its indicating portion into the finder field, and a latch member operable by detecting shutter opening action to retain the indicating member outside the finder field.
Claim 11
Dependent Claim
89 words
The apparatus as set forth in claim 8 wherein the indicating means includes an indicating member so biased as to have its detEcting portion positioned into a gap formed between the electromagnet and the attraction piece when the attraction piece is not attracted by the electromagnet upon tripping the shutter to place its indicating portion into the finder field and the indicating member comes into contact with a shutter blind at the almost final stage of travel of the shutter blind to brake the blind with the biasing force.
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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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |