Patent US463467A successfully refreshed from Google Patents.
Patent US4586793A successfully refreshed from Google Patents.
US4586793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens
Assignee: Canon Inc
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Filing: 1983-03-25
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Granted: 1986-05-06
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Expires: 2003-03-25
Abstract
Abstract A zoom lens having a lst lens component of negative power counting from front, and a 2nd lens component of positive power, with an air separation therebetween being varied to effect zooming, wherein said 2nd component is divided into two components one of which is made movable for focusing, thus minimizing the bulk and size of the entire system, while still achieving good correction of aberrations.
Inventors
- 👤 Tsunefumi Tanaka
- 👤 Keiji Ikemori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:29
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/16; G02B15/177
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
88 words
A zoom lens comprising: two lens components, said two lens components being, from front to rear, a first lens component having a negative refactive power, a second lens component having a positive refractive power and a plurality of lens subcomponents, those lens subcomponents moving unitedly along the optical axis during zooming, wherein zooming is performed by varying the air separation between said first lens component and said second lens component, and focusing is performed by moving one of the plurality of said subcomponents of said second lens component.
Claim 2
Dependent Claim
88 words
A zoom lens comprising: two lens components, said two lens components being, from front to rear, a first lens component having a negative refactive power, a second lens component having a positive refractive power and a plurality of lens subcomponents, those lens subcomponents moving unitedly along the optical axis during zooming, wherein zooming is performed by varying the air separation between said first lens component and said second lens component, and focusing is performed by moving one of the plurality of said subcomponents of said second lens component.
Claim 3
Dependent Claim
33 words
A zoom lens according to claim 1, wherein said 2nd lens component has two lens subcomponents of positive and negative refractive powers, and focusing is performed by one of said two lens subcomponents.
Claim 4
Dependent Claim
44 words
A zoom lens according to claim 2, wherein said two lens subcomponents comprise, from front to rear, a front lens subcomponent of positive refractive power and a rear lens subcomponent of negative refractive power, and focusing is performed by moving said rear lens subcomponent.
Claim 5
Dependent Claim
34 words
A zoom lens according to claim 2, satisfying the relationship -6.0<φ2/φ22 <-2.0 where φ2 is the refractive power of said second lens component and φ22 is the refractive power of said lens rear subcomponent.
Claim 6
Dependent Claim
69 words
A zoom lens comprising: a front lens component which moves along the optical axis during zooming; a rear lens component arranged on the image side of the front lens component, having a power reverse to that of the front lens component and including two lens subcomponents which move unitedly along the optical axis during zooming, one of said two lens subcomponents being movable along the optical axis for focusing.
Claim 7
Dependent Claim
69 words
A zoom lens comprising: a front lens component which moves along the optical axis during zooming; a rear lens component arranged on the image side of the front lens component, having a power reverse to that of the front lens component and including two lens subcomponents which move unitedly along the optical axis during zooming, one of said two lens subcomponents being movable along the optical axis for focusing.
Claim 8
Dependent Claim
29 words
A zoom lens according to claim 5, in which one of the two lens subcomponents of the rear lens component moves apart from the other lens subcomponent for focusing.
Claim 9
Dependent Claim
27 words
A zoom lens according to claim 6, in which the lens subcomponent which moves for focusing is arranged on the image side and has a negative power.
Claim 10
Dependent Claim
26 words
A zoom lens according to claim 5, in which the front lens component has a negative power and the rear lens component has a positive power.
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) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |