US3785266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A single lens reflex camera capable of open aperture photometry and aperture stop photometry
Assignee: Canon Inc
•
Filing: 1971-11-01
•
Granted: 1974-01-15
•
Expires: 1991-11-01
Abstract
Abstract A single lens reflex camera, on which can be mounted both types of interchangeable lenses for open aperture and aperture stop photometry, is provided with a mechanism. This mechanism enables to operate open aperture photometry or aperture stop photometry selectively, even when an interchangeable lens for open aperture photometry is mounted on a camera.
Inventors
- 👤 Y Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:23
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A single lens reflex system capable selectively of open aperture photometry and aperture stop photometry comprising: a. means for varying the aperture setting of said lens system; b. means for controlling a selected preset aperture opening for said aperture varying means; c. means for metering the light from the object, including a pointer and photoelectric means for deflecting said pointer in proportion to the quantity of said light; d. matching indicator means for open aperture photometry comprising a first matching member movable for alignment with said pointer; e. means for coupling said first matching member to said means for controlling a selected preset aperture opening, so as to move said first matching member in response to movement of said means for controlling; f. matching indicator means for aperture stop photometry comprising a second matching member stationarily disposed within the deflection range of said pointer; g. means including an operating member for actuating said aperture varying means to said selected preset aperture opening; and h. means for displacing said first matching member beyond the deflection range of said pointer for aperture stop photometry, said means for displacing being coupled to said operating member; whereby exposure may be properly determined by a technique selected from open aperture and aperture stop photometry, selectively as desired, by aligning said pointer and one of said first and second matching means respectively.
Claim 2
Dependent Claim
226 words
A single lens reflex system capable selectively of open aperture photometry and aperture stop photometry comprising: a. means for varying the aperture setting of said lens system; b. means for controlling a selected preset aperture opening for said aperture varying means; c. means for metering the light from the object, including a pointer and photoelectric means for deflecting said pointer in proportion to the quantity of said light; d. matching indicator means for open aperture photometry comprising a first matching member movable for alignment with said pointer; e. means for coupling said first matching member to said means for controlling a selected preset aperture opening, so as to move said first matching member in response to movement of said means for controlling; f. matching indicator means for aperture stop photometry comprising a second matching member stationarily disposed within the deflection range of said pointer; g. means including an operating member for actuating said aperture varying means to said selected preset aperture opening; and h. means for displacing said first matching member beyond the deflection range of said pointer for aperture stop photometry, said means for displacing being coupled to said operating member; whereby exposure may be properly determined by a technique selected from open aperture and aperture stop photometry, selectively as desired, by aligning said pointer and one of said first and second matching means respectively.
Claim 3
Dependent Claim
94 words
A single lens reflex system as set forth in claim 1, wherein said matching indicator means for open aperture photometry further comprises; a. a first cam member slidably mounted with respect to said system and having a cam portion; b. an intermediate lever member pivotally mounted with respect to said system in proximity to said first matching member; and c. means for causing said lever member to follow said cam portion in response to the sliding of said first cam member so as to move said first matching member into alignment with said pointer.
Claim 4
Dependent Claim
104 words
A single lens reflex system as set forth in claim 2 wherein said means for displacing said first matching member comprises: a. a slide member havIng a cam surface at one end thereof, said slide member being mounted so that said cam surface is engagable with a portion of said intermediate lever; and b. means for sliding said slide member so as to cause said cam surface to engage with said portion of the intermediate lever; whereby said intermediate lever is pivoted into engagement with said first matching member, causing said first matching member to be displaced beyond the deflection range of said pointer.
Claim 5
Dependent Claim
57 words
A single lens reflex system as set forth in claim 3 further including: a. a spring loaded retarding member slidably mounted on said slide member; and b. means mounted on said retarding member for engaging said operating member, so that said retarding member causes said operating member to actuate said aperture varying means during aperture stop photometry.
Claim 6
Dependent Claim
34 words
A single lens reflex system as set forth in claim 1 further including means for causing said operating member to actuate said aperture varying means in response to shutter release for open aperture photometry.
Claim 7
Dependent Claim
119 words
A single lens reflex system as set forth in claim 2 wherein said means for coupling said first matching means comprises: a. a ring having a projection thereon for engagement with said means for controlling a selected preset aperture opening; b. said ring being mounted concentrically with respect to the optical axis of said lens system and rotatable with respect thereto; c. biasing means tending to cause said ring to return said first matching member to its initial position; and d. means mounted on said ring for coupling said ring to said first cam member; so that said first matching member may be moved into alignment with said pointer by said means for controlling a selected preset aperture opening.
Claim 8
Dependent Claim
28 words
A single lens reflex system as set forth in claim 1 wherein said second matching member comprises a marking stationarily disposed within the deflection range of said pointer.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |