Patent US3677155A successfully refreshed from Google Patents.
US3677155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens mount
Assignee: Ernst Leitz Wetzlar GmbH
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Filing: 1971-08-02
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Granted: 1972-07-18
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Expires: 1991-08-02
Abstract
Abstract For setting a photographic objective to a specific object distance, the objective is provided with an inner lens barrel (2) wherein a plurality of lenses are mounted, and with an outer range adjustment ring (5). The lens barrel moves back and forward in axial direction upon rotation of the adjustment ring (8). A cam ring having its cam extending in axial backward direction is coaxially mounted around the lens barrel for joint back and forward movement. Mechanical means (6) interconnect the cam ring with the range adjustment ring so that the cam ring is both displaced axially and also rotated when the objective is set to a specific distance. A cam follower is tiltably provided in the lens mount having one arm projecting in the direction of the camera body. The arm moves back and forward during range adjustment as a function of the difference between the lens barrel displacement and the cam gradient and transmits information to the range finder in the camera body.
Inventors
- 👤 Gerhart Bechmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:51
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B17/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
245 words
The lens mount of a photographic objective having an optical axis and having means for transmitting information concerning the lens position along said optical axis to the movable member of the range finder means in the photographic camera body, the mount comprising: a stationary tubular mount member adapted to be attached to the camera body; a range adjustment ring rotatably supported on said stationary mount member; a lens barrel arranged coaxially inside said stationary mount member; means mechanically interconnecting said range adjustment ring and said lens barrel for displacing said lens barrel in the direction of the optical axis upon rotation of said range adjustment ring; a cam ring being mounted rotatably on said lens barrel for joint movement therewith in axial direction when said range adjustment ring is rotated and comprising an annular cam extending in the rearward direction of said objective; means interconnecting said cam ring and said range adjustment ring for joint rotation when said range adjustment ring is rOtated so that during range adjustment said cam ring is both axially displaced and rotated about said optical axis; and a cam follower in abutting engagement with said cam so that during range adjustment said cam follower is displaced in axial direction by the difference between the axial displacement of said cam ring and the gradient of said cam, said cam follower comprising an arm extending to the rear of said objective for engagement with said range finder means in said camera body.
Claim 2
Dependent Claim
245 words
The lens mount of a photographic objective having an optical axis and having means for transmitting information concerning the lens position along said optical axis to the movable member of the range finder means in the photographic camera body, the mount comprising: a stationary tubular mount member adapted to be attached to the camera body; a range adjustment ring rotatably supported on said stationary mount member; a lens barrel arranged coaxially inside said stationary mount member; means mechanically interconnecting said range adjustment ring and said lens barrel for displacing said lens barrel in the direction of the optical axis upon rotation of said range adjustment ring; a cam ring being mounted rotatably on said lens barrel for joint movement therewith in axial direction when said range adjustment ring is rotated and comprising an annular cam extending in the rearward direction of said objective; means interconnecting said cam ring and said range adjustment ring for joint rotation when said range adjustment ring is rOtated so that during range adjustment said cam ring is both axially displaced and rotated about said optical axis; and a cam follower in abutting engagement with said cam so that during range adjustment said cam follower is displaced in axial direction by the difference between the axial displacement of said cam ring and the gradient of said cam, said cam follower comprising an arm extending to the rear of said objective for engagement with said range finder means in said camera body.
Claim 3
Dependent Claim
54 words
The lens mount as claimed in claim 1, wherein said cam follower is a lever having a form of a ring segment and being tiltably mounted with one end on the inner surface of said tubular mount member so as to tilt about an axis intersecting said optical axis at a substantially right angle.
Claim 4
Dependent Claim
50 words
The lens mount as claimed in claim 1, wherein said cam follower is a ring arranged coaxially to said optical axis and being tiltably mounted on the inner surface of said tubular mount member so as to tilt about an axis intersecting said optical axis at a substantially right angle.
Claim 5
Dependent Claim
26 words
The lens mount as claimed in claim 1, and further comprising spring means for keeping said cam follower in a resilient abutting engagement with said cam.
References Cited (Backward Citations)
US2809572A
Cited
US3029720A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |