US4676600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound preventing means in sliding lens barrel and method of manufacture thereof
Assignee: Pentax Corp
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Filing: 1985-03-29
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Granted: 1987-06-30
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Expires: 2005-03-29
Abstract
Abstract A lens mount arrangement in which at least a pair of sliding cylindrical barrels are slidable relative to one another, which lens mount is manufactured using an inexpensive and simple process, yet the amount of sound generated during a sliding movement is significantly reduced. In accordance with an important feature of the invention, machining lead angles of the pair of sliding cylindrical surfaces are made different from each other. The lead angles may be made different in direction, or they can have the same direction but differ by at least 10° from one another.
Inventors
- 👤 Morio Takizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:55
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
In a lens mount having a pair of barrels with confronting sliding cylindrical surfaces which are slidable relative to each other and which are formed by machining, the improvement wherein lead angles used in machining said pair of sliding cylindrical surfaces are different from each other.
Claim 2
Dependent Claim
46 words
In a lens mount having a pair of barrels with confronting sliding cylindrical surfaces which are slidable relative to each other and which are formed by machining, the improvement wherein lead angles used in machining said pair of sliding cylindrical surfaces are different from each other.
Claim 3
Dependent Claim
28 words
The lens mount as claimed in claim 1, in which said machining lead angles of said pair of sliding cylindrical surfaces are different in direction from each other.
Claim 4
Dependent Claim
35 words
The lens mount as claimed in claim 1, in which said machining lead angles of said pair of sliding cylindrical surfaces are the same in direction and differ by at least 10° from each other.
Claim 5
Dependent Claim
54 words
The lens mount as claimed in any one of claims 1, 2 and 3, in which a spiral relay part corresponding to a position of an end of a machining tool is formed, as a recess unrelated to sliding surfaces, on a one of said sliding cylindrical surfaces which is larger in lead angle.
Claim 6
Dependent Claim
15 words
The lens mount as claimed in claim 4, wherein said machining tool is forming tool.
Claim 7
Independent Claim
62 words
A method of forming a lens mount having a pair of barrels with confronting sliding cylindrical surfaces which are slidable relative to each other, said method comprising: machining one of said confronting cylindrical surfaces at a first machining lead angle; and machining the other of said confronting cylindrical surfaces at a second machining lead angle, different from said first machining lead angle.
Claim 8
Independent Claim
62 words
A method of forming a lens mount having a pair of barrels with confronting sliding cylindrical surfaces which are slidable relative to each other, said method comprising: machining one of said confronting cylindrical surfaces at a first machining lead angle; and machining the other of said confronting cylindrical surfaces at a second machining lead angle, different from said first machining lead angle.
Claim 9
Dependent Claim
39 words
A method as claimed in claim 6, wherein said second machining step comprises the step of machining the other of said confronting cylindrical surfaces at a second machining lead angle, different in direction from said first machining lead angle.
Claim 10
Dependent Claim
52 words
A method as claimed in claim 6, wherein said second machining step comprises the step of machining the other of said confronting cylindrical surfaces at a second machining lead angle, in the same direction as said first machining lead angle, and different by at least 10° from said first machining lead angle.
References Cited (Backward Citations)
US3233514A
Cited
US3876290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-29 | 1990-12-29 | 1991-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-29 | 1994-12-29 | 1995-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-29 | 1998-12-29 | 1999-06-30 | $7700.00 | Window Closed / Lapsed |