Patent US3762295A successfully refreshed from Google Patents.
US3762295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera with exchangeable lens
Assignee: Hattori Tokeiten KK
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Filing: 1971-04-09
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Granted: 1973-10-02
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Expires: 1991-04-09
Abstract
Abstract A camera body having a mount for removably mounting different lens units thereon. The lens units have a built-in shutter and a built-in circuit for opening and closing the shutter. The camera body has a built-in circuit electrically connected to the lens unit circuit when it is mounted on the camera for taking an exposure. The circuit in the camera has the major electrical components such as a built-in light meter and power source for controlling the operation of opening and closing the shutter. The camera body and the lens unit each have a set of electrical contacts connected at different points to the circuits therein and provided with respective spherical contact surfaces for making electrical connection between the circuits automatically when the lens unit is attached or mounted im position on the camera body for taking a photographic exposure.
Inventors
- 👤 K Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:28
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/58; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G03B7/00; G03B7/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
213 words
A camera comprising, an interchangeable lens unit comprising a shutter and electromagnetic means for controlling actuation of said shutter, a camera body having an exposure aperture, an electric timing circuit in said camera body for timing exposures and controlling said electromagnetic means, mounting means on said camera body for removably and interchangeably mounting said lens unit in registry with said exposure aperture, said lens unit having bayonet mount means bayonet-stabbed into said mounting means for mounting therein, said bayonet means and said mounting means each including means coactive upon angular rotation of said lens unit relative to said mounting means to releasably lock the lens unit on said mounting means, a set of electrical contacts on said camera body mounting means connected to said timing circuit and another set of electrical contacts on said bayonet mount means of said lens unit connected to said electromagnetic means, said contacts on said mounting means and the contacts on said lens unit being angularly disposed for semi-automatically placing the two sets of electrical contacts in registry and electrically connecting said timing circuit and said electromagnetic means for timing exposures with said shutter when said lens unit is bayonet-stabbed into said mounting means and rotated to releasably lock it in said mounting means on said camera body.
Claim 2
Dependent Claim
213 words
A camera comprising, an interchangeable lens unit comprising a shutter and electromagnetic means for controlling actuation of said shutter, a camera body having an exposure aperture, an electric timing circuit in said camera body for timing exposures and controlling said electromagnetic means, mounting means on said camera body for removably and interchangeably mounting said lens unit in registry with said exposure aperture, said lens unit having bayonet mount means bayonet-stabbed into said mounting means for mounting therein, said bayonet means and said mounting means each including means coactive upon angular rotation of said lens unit relative to said mounting means to releasably lock the lens unit on said mounting means, a set of electrical contacts on said camera body mounting means connected to said timing circuit and another set of electrical contacts on said bayonet mount means of said lens unit connected to said electromagnetic means, said contacts on said mounting means and the contacts on said lens unit being angularly disposed for semi-automatically placing the two sets of electrical contacts in registry and electrically connecting said timing circuit and said electromagnetic means for timing exposures with said shutter when said lens unit is bayonet-stabbed into said mounting means and rotated to releasably lock it in said mounting means on said camera body.
Claim 3
Dependent Claim
102 words
A camera according to claim 1, in which the contacts of said camera body are elongated, means biasing each contact axially individually to a position in which it projects outwardly of surfaces on said camera body mounting means for engaging the contacts on said lens unit, and in which the contacts of the lens unit have contact surfaces extending outwardly of surfaces on said bayonet mount means, and said surfaces of said camera body and said bayonet mount means being disposed in opposed relationship when said lens unit is removably mounted on said camera body in position for taking a photographic exposure.
Claim 4
Dependent Claim
90 words
A camera according to claim 1, in which said both sets of contacts have hemispherical contact surfaces and the hemispherical contact surfaces of the contacts on said lens unit have less curvature and greater area than the hemispherical contact surfaces of the contacts on said camera body, means mounting the contacts of said camera body for movement to a retracted position and a projected position to make electrical contact with the contacts of said lens units, and means biasing each contact of said camera body individually to said projected position.
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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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |