US4389098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens barrel
Assignee: Konica Minolta Inc
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Filing: 1980-08-26
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Granted: 1983-06-21
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Expires: 2000-08-26
Abstract
Abstract In a zoom lens the fixed barrel is provided with one or more smooth outer surfaces on which are slidably supported an operating member supporting a first lens system and a driven member supporting a second lens system. A linear slot and a first oblique cam slot are formed in one or the other of the outer barrel surfaces and a second cam slot is formed in the operating member. The operating member slides in the linear slot, and pin means on the driven member engages the two cam slots. This mechanical arrangement permits movement of the lens systems frame a wide-angle to a telescopic position and vice versa. Since all sliding movement is on the outside of the barrel, applied lubricant does not fall inside the barrel and the inner surface of the barrel may be treated in any suitable manner to prevent internal reflections.
Inventors
- 👤 Syousuke Fukushima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:20
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
In a zoom lens having at least two movable lenses, the combination of a fixed barrel having at least two outwardly positioned smooth supporting surfaces, means forming an optically axial linear slot and a first cam slot oblique to the optical axis in one of said surfaces, an operating member having a second cam slot therein slidably mounted in said linear slot on one of said smooth supporting surfaces, a first lens system supported from said operating member, a driven member slidably supported on one of said smooth supporting surfaces, a second lens system supported from said driven member, and pin means mounted on said driven member and extending vertically therefrom into said first and second cam slots, whereby movement of said operating member in said linear slot causes sliding movement of said operating member and said driven member on the said outer surfaces of said barrel and axial movement of said two lens system relatively to one another.
Claim 2
Dependent Claim
159 words
In a zoom lens having at least two movable lenses, the combination of a fixed barrel having at least two outwardly positioned smooth supporting surfaces, means forming an optically axial linear slot and a first cam slot oblique to the optical axis in one of said surfaces, an operating member having a second cam slot therein slidably mounted in said linear slot on one of said smooth supporting surfaces, a first lens system supported from said operating member, a driven member slidably supported on one of said smooth supporting surfaces, a second lens system supported from said driven member, and pin means mounted on said driven member and extending vertically therefrom into said first and second cam slots, whereby movement of said operating member in said linear slot causes sliding movement of said operating member and said driven member on the said outer surfaces of said barrel and axial movement of said two lens system relatively to one another.
Claim 3
Dependent Claim
65 words
In a zoom lens according to claim 1 in which said operating member is slidably mounted on the smooth supporting surface having said linear slot and said first cam slot, and said driven member is slidably mounted on the other smooth supporting surface, and in which said pin means comprises a pin extending outwardly of said driven member into said first and second cam slots
Claim 4
Dependent Claim
79 words
In a zoom lens according to claim 1, in which said driven member is slidably mounted on the smooth supporting surface having said linear slot and said first cam slot, and said operating member is slidably mounted on said other smooth supporting surface, and in which said pin means comprises a first pin extending outwardly of said driven member into said second cam slot and a second pin extending outwardly of said driven member into said first cam slot.
Claim 5
Dependent Claim
25 words
In a zoom lens according to claims 1, 2 or 3 in combination with antireflection means provided on the inner surfaces of said fixed barrel.
References Cited (Backward Citations)
US3090282A
Cited
US4275952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-20 | 1986-12-20 | 1987-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-20 | 1990-12-20 | 1991-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-20 | 1994-12-20 | 1995-06-21 | $7700.00 | Window Closed / Lapsed |