Patent US3714878A successfully refreshed from Google Patents.
US3714878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-lens reflex camera having interchangeable lenses
Assignee: Canon Inc
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Filing: 1970-11-30
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Granted: 1973-02-06
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Expires: 1990-11-30
Abstract
Abstract A single lens reflex camera having interchangeable lenses, an exposure meter capable of carrying out photometering of the light through a phototaking lens according to the system of the lens attached. A sliding cam plate is movable to a position corresponding to a preset value of a diaphragm aperture by the engagement of an interchangeable lens with a preset pin. A rocking lever is engageable with the sliding cam plate for positioning at a predetermined location in accordance with the location of the preset pin for adjusting the exposure meter to open aperture photometry, and a sliding member is operatively engageable with an aperture setting pin of the lens. A setting lever is connected to the sliding member for setting the aperture to a preset value, a portion of the setting member being engageable with the rocking lever when the setting lever is actuated to set the exposure, thereby to pivot the rocking lever for adjusting the exposure meter to open aperture photometry. A warning member in operative association with the rocking lever is movable between a warning range and a photometry range.
Inventors
- 👤 G Hasegawa
- 👤 Y Iura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:33
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/18; G03B19/00; G03B19/02; G03B19/12; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
In a single lens reflex camera, attachable with different kinds of interchangeable lenses and provided with an exposure meter capable of carrying out photometering of the light through a phototaking lens according to the system of the lens attached, the combination comprising aperture preset value transmitting means for transmitting a preset aperture value to said exposure meter when interlocked with an aperture value preset member of said interchangeable lens, aperture setting means for setting the aperture of said interchangeable lens in manual operation, deflection means deflectable by the engagement with said aperture preset value transmitting means and with said aperture setting means, warning means interlocked with said deflection means, a warning member movable between a warning range and a photometry range by said warning means, said deflection means being deflected to its position for locating the warning member within said photometry range when actuated by either said aperture preset value transmitting means or said aperture setting means, said deflection member being deflected to its position for locating the warning member within said warning range when actuated by both said aperture preset value transmitting means and said aperture setting means.
Claim 2
Dependent Claim
189 words
In a single lens reflex camera, attachable with different kinds of interchangeable lenses and provided with an exposure meter capable of carrying out photometering of the light through a phototaking lens according to the system of the lens attached, the combination comprising aperture preset value transmitting means for transmitting a preset aperture value to said exposure meter when interlocked with an aperture value preset member of said interchangeable lens, aperture setting means for setting the aperture of said interchangeable lens in manual operation, deflection means deflectable by the engagement with said aperture preset value transmitting means and with said aperture setting means, warning means interlocked with said deflection means, a warning member movable between a warning range and a photometry range by said warning means, said deflection means being deflected to its position for locating the warning member within said photometry range when actuated by either said aperture preset value transmitting means or said aperture setting means, said deflection member being deflected to its position for locating the warning member within said warning range when actuated by both said aperture preset value transmitting means and said aperture setting means.
Claim 3
Dependent Claim
189 words
In a single lens reflex camera, attachable with different kinds of interchangeable lenses and provided with an exposure meter capable of carrying out photometering of the light through a phototaking lens according to the system of the lens attached, the combination comprising aperture preset value transmitting means for transmitting a preset aperture value to said exposure meter when interlocked with an aperture value preset member of said interchangeable lens, aperture setting means for setting the aperture of said interchangeable lens in manual operation, deflection means deflectable by the engagement with said aperture preset value transmitting means and with said aperture setting means, warning means interlocked with said deflection means, a warning member movable between a warning range and a photometry range by said warning means, said deflection means being deflected to its position for locating the warning member within said photometry range when actuated by either said aperture preset value transmitting means or said aperture setting means, said deflection member being deflected to its position for locating the warning member within said warning range when actuated by both said aperture preset value transmitting means and said aperture setting means.
Claim 4
Dependent Claim
189 words
In a single lens reflex camera, attachable with different kinds of interchangeable lenses and provided with an exposure meter capable of carrying out photometering of the light through a phototaking lens according to the system of the lens attached, the combination comprising aperture preset value transmitting means for transmitting a preset aperture value to said exposure meter when interlocked with an aperture value preset member of said interchangeable lens, aperture setting means for setting the aperture of said interchangeable lens in manual operation, deflection means deflectable by the engagement with said aperture preset value transmitting means and with said aperture setting means, warning means interlocked with said deflection means, a warning member movable between a warning range and a photometry range by said warning means, said deflection means being deflected to its position for locating the warning member within said photometry range when actuated by either said aperture preset value transmitting means or said aperture setting means, said deflection member being deflected to its position for locating the warning member within said warning range when actuated by both said aperture preset value transmitting means and said aperture setting means.
Claim 5
Dependent Claim
16 words
Apparatus according to claim 1 wherein said warning member is a pointer in said exposure meter.
Claim 6
Dependent Claim
106 words
Apparatus according to claim 2, wherein said deflection means includes a pair of pivotally mounted levers, said aperture preset value transmitting means includes a cam plate, said aperture setting means includes a sliding member, said exposure mEter includes an electric circuit, and said warning means includes electrical contacts in said electric circuit, whereby said pair of pivotally mounted levers are deflected to their positions for closing said contacts when actuated by either said cam plate or said sliding member, and said pair of pivotally mounted levers are deflected to their positions for opening said contacts when actuated by both said cam plate and said sliding member.
Claim 7
Dependent Claim
102 words
Apparatus according to claim 2, wherein said deflection means includes a rocking lever, said aperture preset value transmitting means includes a cam, said aperture setting means includes a sliding member, said warning means includes a following pointer lever, and said warning member includes a following pointer, whereby said rocking lever is deflected to its position for locating said following pointer within said photometry range when actuated by either said cam or said sliding member, and said rocking lever is deflected to its position for locating said following pointer within said warning range when actuated by both said cam and said sliding member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |