US4498754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single lens reflex camera
Assignee: Ricoh Co Ltd
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Filing: 1983-01-12
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Granted: 1985-02-12
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Expires: 2003-01-12
Abstract
Abstract A quick mirror return mechanism includes a return spring and a quick return setting member, which are formed, in the region where they abut against each other, so that as the return spring is stressed, the resilient force of the return spring is directed closer to the direction in which a setting pawl moves. A main mirror for a finder, a stationary member, a mirror-up lever, a main mirror drive, a sub-mirror and a sub-mirror driver form together a six-bar linkage wherein the main mirror moves upward while swinging back and the sub-mirror moves into overlapping relationship with the main mirror when the latter has completed its upward movement. The quick return mechanism which is biased with an increased force is disposed on a front panel of a camera, thus preventing any excessive force from being applied to a mirror box. A light receiving element unit is disposed in the bottom of the mirror box. A light receiving element unit is disposed in the bottom of the mirror box, and is arranged on a substrate, tilting of which can be separately adjusted in the fore-and-aft and lateral or left-and-right direction by adjusting the angular positions of a first and a second lever.
Inventors
- 👤 Yoshimi Ohno
- 👤 Ikuya Tsurukawa
- 👤 Tokio Ishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:56
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
A single lens reflex camera having a mirror box and comprising: a substrate; a light receiving element mounted on said substrate; a first and second stationary shaft; a mechanism for adjusting tilting of said light receiving element, said adjusting mechanism being disposed within a bottom portion of said mirror box and which further comprises an element support plate having an end thereof pivotally connected with said substrate on which said light receiving element is mounted; a first lever having a first end thereof pivotally mounted on said first stationary shaft and a second end thereof pivotally connected to said element support plate; a second lever located on a side of said element support plate from said first lever and pivotally mounted on said second stationary shaft; a relay lever pivotally mounted on the second lever and abutting against said substrate and said element support plate at different radii of rotation from a point of pivotal connection; and means for adjusting the angular position of the first and second levers for tilting of the substrate in a lateral direction and in a fore-and-aft direction.
Claim 2
Dependent Claim
183 words
A single lens reflex camera having a mirror box and comprising: a substrate; a light receiving element mounted on said substrate; a first and second stationary shaft; a mechanism for adjusting tilting of said light receiving element, said adjusting mechanism being disposed within a bottom portion of said mirror box and which further comprises an element support plate having an end thereof pivotally connected with said substrate on which said light receiving element is mounted; a first lever having a first end thereof pivotally mounted on said first stationary shaft and a second end thereof pivotally connected to said element support plate; a second lever located on a side of said element support plate from said first lever and pivotally mounted on said second stationary shaft; a relay lever pivotally mounted on the second lever and abutting against said substrate and said element support plate at different radii of rotation from a point of pivotal connection; and means for adjusting the angular position of the first and second levers for tilting of the substrate in a lateral direction and in a fore-and-aft direction.
Claim 3
Dependent Claim
112 words
A single lens reflex camera having a mirror box and a carrier and comprising: a light receiving element unit disposed within a bottom portion of said mirror box, wherein said light receiving unit further comprises light receiving means carried by said carrier for receiving incident light and converting said incident light into a corresponding electrical signal; a fixing member fixedly mounted within the camera and holding the carrier; electrical contact means mounted on the fixing member for allowing an electrical signal from the light receiving means to be derived externally; and processing circuit means mounted on said carrier for converting an electrical signal from the light receiving means into a processed signal.
Claim 4
Dependent Claim
112 words
A single lens reflex camera having a mirror box and a carrier and comprising: a light receiving element unit disposed within a bottom portion of said mirror box, wherein said light receiving unit further comprises light receiving means carried by said carrier for receiving incident light and converting said incident light into a corresponding electrical signal; a fixing member fixedly mounted within the camera and holding the carrier; electrical contact means mounted on the fixing member for allowing an electrical signal from the light receiving means to be derived externally; and processing circuit means mounted on said carrier for converting an electrical signal from the light receiving means into a processed signal.
Claim 5
Dependent Claim
28 words
A single lens reflex camera according claim 2 wherein the light receiving means further comprises light receiving means for determining a distance to an object to be photographed.
Claim 6
Dependent Claim
112 words
A single lens reflex camera having a mirror box and a carrier, comprising: a light receiving element unit disposed within a bottom portion of said mirror box, wherein said light receiving unit further comprises light receiving means carried by said carrier for receiving incident light and converting said incident light into a corresponding electrical signal; a fixing member fixedly mounted within the camera and holding the carrier; electrical contact means mounted on the fixing member for allowing an electrical signal from the light receiving means to be derived externally; and processing circuit means mounted on said fixing member for converting an electrical signal from the light receiving means into a processed signal.
Claim 7
Dependent Claim
112 words
A single lens reflex camera having a mirror box and a carrier, comprising: a light receiving element unit disposed within a bottom portion of said mirror box, wherein said light receiving unit further comprises light receiving means carried by said carrier for receiving incident light and converting said incident light into a corresponding electrical signal; a fixing member fixedly mounted within the camera and holding the carrier; electrical contact means mounted on the fixing member for allowing an electrical signal from the light receiving means to be derived externally; and processing circuit means mounted on said fixing member for converting an electrical signal from the light receiving means into a processed signal.
Claim 8
Dependent Claim
27 words
A single lens reflex camera according to claim 4, wherein the light receiving means further comprises means for determining a distance to an object to be photographed.
References Cited (Backward Citations)
US4391513A
Cited
US4427277A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |