US5243368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ophthalmologic apparatus
Assignee: Kowa Co Ltd
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Filing: 1990-10-15
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Granted: 1993-09-07
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Expires: 2010-10-15
Abstract
Abstract An ophthalmologic apparatus equipped with a projection optical system for projecting a laser beam spot image onto a prescribed point of an eye under examination has a zoom lens provided in the projection optical system for enabling the diameter of the projected spot image to be varied and some of the lenses of the zoom lens are made movable for enabling projection of a blurred spot image.
Inventors
- 👤 Kosuke Ito
- 👤 Chikashi Koike
- 👤 Hirokatsu Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:43
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/13; A61B3/135; G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
An ophthalmologic apparatus having a projection optical system for projecting a laser beam onto a prescribed point of an eye under examination as a spot image, comprising a zoom lens provided in the projection optical system for enabling the diameter of the projected spot image to be varied, at least one lens of the zoom lens being movable for enabling projection of a blurred spot image.
Claim 2
Dependent Claim
66 words
An ophthalmologic apparatus having a projection optical system for projecting a laser beam onto a prescribed point of an eye under examination as a spot image, comprising a zoom lens provided in the projection optical system for enabling the diameter of the projected spot image to be varied, at least one lens of the zoom lens being movable for enabling projection of a blurred spot image.
Claim 3
Dependent Claim
30 words
An ophthalmologic apparatus according to claim 1, wherein the zoom lens comprises a plurality of lenses at least one of which is movable and the remainder of which are fixed.
Claim 4
Dependent Claim
27 words
An ophthalmologic apparatus according to claim 2, wherein movement of the lenses constituting the zoom lens is controlled by cam grooves provided in a zoom lens barrel.
Claim 5
Dependent Claim
40 words
An ophthalmologic apparatus according to claim 1, wherein the zoom lens has a zoom range within which the diameter of the projected spot image can be varied, the blurred spot image being projected within a part of the zoom range.
Claim 6
Dependent Claim
34 words
An ophthalmologic apparatus according to claim 4, wherein the zoom lens projects a focused spot image within the whole zoom range except for a limited range within which the blurred spot image is projected.
References Cited (Backward Citations)
US3703176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-06 | 1997-03-08 | 1997-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-06 | 2001-03-08 | 2001-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-06 | 2005-03-08 | 2005-09-07 | $7700.00 | Window Closed / Lapsed |