US3777646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic shutter for photographic camera
Assignee: Nidec Precision Corp
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Filing: 1972-05-19
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Granted: 1973-12-11
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Expires: 1992-05-19
Abstract
Abstract In order that a designed specific exposure time, for example, one-one hundred twenty-fifths of a second, may be obtained automatically in case the electronic exposure time control means has become disabled due to causes such as dissipated battery, there is provided an electronic shutter for photographic camera comprising a hook lever adapted to anchor the armature lever for a while only when the electronic exposure time control means fails to work at the time the shutter is released, and a cam member for releasing said anchored state. This electronic shutter contains a flash light means which is rendered ready to being operative when the electronic exposure time control means is switched over to the inoperative state.
Inventors
- 👤 M Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:21
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
258 words
An electronic shutter for photographic camera, comprising an exposure time control circuit, a battery connected to said exposure time control circuit, an electromagnet connected to said exposure time control circuit, an armature lever having at one end thereof a pole-contacting portion facing the magnetic pole of said electromagnet, a holding lever provided adjacent to said armature lever and arranged so as to urge said pole-contacting portion against the magnetic pole of said electromagnet, a control cam member having a cam member provided thereon and having a cam portion engageable with said holding lever, a shutter blade opening member provided adjacent to said control cam member and arranged so as to be released by said control cam member in the final stage of movement of said control cam member, a shutter blade closing member provided adjacent to said armature lever and arranged so as to be released by said armature lever as the latter moves, a hook lever provided adjacent to said control cam member and having at one end thereof a hook portion engageable with said armature lever, and a control lever carried by said hook lever and having two arms engageable with said cam member and said shutter blade opening member, respectively, said electronic shutter being operative so that upon the shutter release operation, said armature lever is anchored by said hook lever only when said armature lever tends to move without being attracted to said electromagnet and held there, and that this anchored state is released by the shutter blade opening member as this member moves.
Claim 2
Dependent Claim
258 words
An electronic shutter for photographic camera, comprising an exposure time control circuit, a battery connected to said exposure time control circuit, an electromagnet connected to said exposure time control circuit, an armature lever having at one end thereof a pole-contacting portion facing the magnetic pole of said electromagnet, a holding lever provided adjacent to said armature lever and arranged so as to urge said pole-contacting portion against the magnetic pole of said electromagnet, a control cam member having a cam member provided thereon and having a cam portion engageable with said holding lever, a shutter blade opening member provided adjacent to said control cam member and arranged so as to be released by said control cam member in the final stage of movement of said control cam member, a shutter blade closing member provided adjacent to said armature lever and arranged so as to be released by said armature lever as the latter moves, a hook lever provided adjacent to said control cam member and having at one end thereof a hook portion engageable with said armature lever, and a control lever carried by said hook lever and having two arms engageable with said cam member and said shutter blade opening member, respectively, said electronic shutter being operative so that upon the shutter release operation, said armature lever is anchored by said hook lever only when said armature lever tends to move without being attracted to said electromagnet and held there, and that this anchored state is released by the shutter blade opening member as this member moves.
Claim 3
Dependent Claim
66 words
An electronic shutter for photographic camera according to claim 1, in which said electronic shutter comprises a changeover switch having one end connected to said battery and a flash light means having one end connected to said exposed time control circuit, and is arranged so that said exposure time control circuit and said flash light means may be used alternatively by swtiching over said changeover switch.
References Cited (Backward Citations)
US3645185A
Cited
US3650193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |