US3773405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for displacing photographic lens
Assignee: Minolta Co Ltd
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Filing: 1972-05-10
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Granted: 1973-11-20
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Expires: 1992-05-10
Abstract
Abstract A displacing device comprises a photographic lens divided into a front lens group and a rear lens group with an air space interposed therebetween which is variable by the displacement of the two lens groups relative to each other, a focus ring displaceably engaged with an outer tube of the lens by a first method of displacement and integrally formed with a frame for holding one of the two lens groups, and an inner tube in engagement with means provided in the outer tube for regulating axial displacement and displaceably engaged with the focus ring by a second method of displacement, the inner tube being integrally formed with a frame for holding the other lens group.
Inventors
- 👤 S Sugano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:54
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A photographic lens for a camera comprising: a photographic lens system divided into a front lens group and a rear lens group with an air space variable by displacement formed therebetween, an outer tube for mounting the photographic lens on the camera body, a focus ring engaged with the outer tube by first displacing means for axially adjusting said focus ring relative to said outer tube by rotation of said focus ring within a focusing range, the focus ring being integrally formed with a frame for holding one of the two lens groups, and an inner tube in engagement with means for regulating axial displacement provided on the outer tube and displaceably engaged with the focus ring by second displacing means, the inner tube being integrally formed with a frame for holding the other lens group of the photographic lens system and adapted for axial displacement relative to said focus ring by the rotation of the focus ring.
Claim 2
Dependent Claim
158 words
A photographic lens for a camera comprising: a photographic lens system divided into a front lens group and a rear lens group with an air space variable by displacement formed therebetween, an outer tube for mounting the photographic lens on the camera body, a focus ring engaged with the outer tube by first displacing means for axially adjusting said focus ring relative to said outer tube by rotation of said focus ring within a focusing range, the focus ring being integrally formed with a frame for holding one of the two lens groups, and an inner tube in engagement with means for regulating axial displacement provided on the outer tube and displaceably engaged with the focus ring by second displacing means, the inner tube being integrally formed with a frame for holding the other lens group of the photographic lens system and adapted for axial displacement relative to said focus ring by the rotation of the focus ring.
Claim 3
Dependent Claim
46 words
The photographic lens as set forth in claim 1 wherein the displacing means are helicoid screws, the outer tube being in screw-thread engagement with the focus ring by first helicoid screw, the focus ring being in screw-thread engagement with the inner tube by second helicoid screws.
Claim 4
Dependent Claim
50 words
The photographic lens as set forth in claim 1 wherein the focus ring holds in its lens holding frame the front lens group of the photographic lens system divided into the front and rear lens groups and the inner tube holds the rear lens group in its lens holding frame.
Claim 5
Dependent Claim
50 words
The photographic lens as set forth in claim 1 wherein the focus ring holds in its lens holding frame the rear lens group of the photographic lens system divided into the front and rear lens groups and the inner tube holds the front lens group in its lens holding frame.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |