US3744884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens mount assembly for focusable, variable focal length lens
Assignee: Bell and Howell Co
•
Filing: 1971-11-02
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Granted: 1973-07-10
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Expires: 1991-11-02
Abstract
Abstract A lens mount assembly for the variable magnification afocal or zoom unit of an objective lens for a camera including first and second barrel portions cooperating to define cam tracks by which optical components are simultaneously and differentially adjusted axially upon rotational adjustment of an external sleeve which further carries a focusing element adjusted by axial movement of the sleeve. Further, a method of fabrication of the lens mount assembly is described.
Inventors
- 👤 D Filipovich
- 👤 R Carlson
- 👤 T Hadzimahalis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:53
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B17/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A lens mount assembly for a lens system including elements simultaneously and differentially axially adjustable comprising: a first cylindrical barrel portion having at least one axially effective cam surface; a second cylindrical barrel portion havIng at least one axially effective cam surface; means attaching said first barrel portion to said second barrel portion to axially relate said respective cam surfaces thereof one to the other in opposing relation; a third barrel portion having an axially effective cam surface disposed in axial relation to another of the cam surfaces of one of said first and second barrel portions; lens element carrier means having telescopically relatable guide portions, said carrier means being alignable in said barrel portions; cam follower means on each carrier means for rotatable and axial positioning of said carrier means relative to said barrel portions; and sleeve means cooperating with at least one of said cam follower means of each carrier means to drivably adjust said carrier means relative to said cam surfaces to cause simultaneous and differential axial adjustment of said lens element.
Claim 2
Dependent Claim
175 words
A lens mount assembly for a lens system including elements simultaneously and differentially axially adjustable comprising: a first cylindrical barrel portion having at least one axially effective cam surface; a second cylindrical barrel portion havIng at least one axially effective cam surface; means attaching said first barrel portion to said second barrel portion to axially relate said respective cam surfaces thereof one to the other in opposing relation; a third barrel portion having an axially effective cam surface disposed in axial relation to another of the cam surfaces of one of said first and second barrel portions; lens element carrier means having telescopically relatable guide portions, said carrier means being alignable in said barrel portions; cam follower means on each carrier means for rotatable and axial positioning of said carrier means relative to said barrel portions; and sleeve means cooperating with at least one of said cam follower means of each carrier means to drivably adjust said carrier means relative to said cam surfaces to cause simultaneous and differential axial adjustment of said lens element.
Claim 3
Dependent Claim
27 words
An assembly as in claim 1 wherein said cam surfaces are multiple cam portions, and said cam follower means includes a follower corresponding to each cam portion.
Claim 4
Dependent Claim
14 words
An assembly as in claim 1 wherein said sleeve means carries a focusing lens.
Claim 5
Dependent Claim
25 words
An assembly as in claim 1 including ledge portions on one of said barrel portions for maintaining spacing relative to the other of barrel portions.
Claim 6
Dependent Claim
33 words
An assembly as in claim 1 including biasing means connecting said sleeve means and one of said barrel portions to urge said sleeve means in a first direction relative to said barrel portion.
Claim 7
Dependent Claim
25 words
An assembly as in claim 5 including biasing means fixed to said second barrel portion for urging said sleeve means toward said first barrel portion.
Claim 8
Dependent Claim
23 words
An assembly as in claim 6 including ledge portions on said second barrel portion for maintaining spacing relative to said first barrel portion.
References Cited (Backward Citations)
US775934A
Cited
US2908209A
Cited
US3220308A
Cited
US3140339A
Cited
US3410630A
Cited
US3437404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |