Patent US3893137A successfully refreshed from Google Patents.
US3893137A
Expired / Lapsed
US
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Dual lens camera focus means
Assignee: Individual
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Filing: 1974-06-10
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Granted: 1975-07-01
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Expires: 1994-06-10
Abstract
Abstract A camera includes a focusable primary lens, a selectively usable converter lens for changing the camera''s effective focal length and a movable focus member. The focus member is usable only when the converter lens is aligned with the camera''s optical axis; at other times the focus member is covered to be inaccessible. The primary lens has a predetermined optimum fixed-focus setting when used alone, and means are provided for automatically adjusting the primary lens to that optimum focus setting when the converter lens is moved out of alignment with the optical axis.
Inventors
- 👤 Helmut Ettischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:16
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/04; G03B19/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
In a camera having a focusable primary lens, a converter lens movable into and out of axial alignment with said primary lens to change the camera''s focal length and a movable focus member for focusing said primary lens; the improvement comprising means movable with said converter lens for covering said focus member when said converter lens is out of alignment with said primary lens, said covering means being moved to a position uncovering said focus member when said converter lens is moved into alignment with said primary lens.
Claim 2
Dependent Claim
88 words
In a camera having a focusable primary lens, a converter lens movable into and out of axial alignment with said primary lens to change the camera''s focal length and a movable focus member for focusing said primary lens; the improvement comprising means movable with said converter lens for covering said focus member when said converter lens is out of alignment with said primary lens, said covering means being moved to a position uncovering said focus member when said converter lens is moved into alignment with said primary lens.
Claim 3
Dependent Claim
67 words
The improvement as defined in claim 1 wherein said primary lens has a predetermined optimum fixed-focus setting when said converter lens is out of alignment therewith, said improvement further comprising means associated with said focus member and said converter lens for moving said focus member to a position corresponding to said optimum fixed-focus setting when said converter lens is moved out of alignment with said primary lens.
References Cited (Backward Citations)
US3185061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |