US3659930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Segmented deflectible screen surface for testing eyes by laser refraction
Assignee: CAMBRIDGE INSTRUMENTS Inc A DEL CORP
•
Filing: 1970-09-28
•
Granted: 1972-05-02
•
Expires: 1990-09-28
Abstract
Abstract A deflectible generally circular screen for testing eyes by laser refraction includes a plurality of thin flexible generally triangularly shaped segments each having a nonspecular surface. The segments are affixed to a base and disposed to have corresponding apexes of the triangularly shaped segments defining a central area of the screen. The surface of each segment opposite the nonspecular surface is disposed to engage an inflatable rubber diaphragm to deflect the triangular segments from a generally concave disposition to a generally planar disposition. After the diaphragm is inflated to engage and cooperatively move the screen, the diaphragm is deflated at a relatively slow controlled rate and a visual pattern formed on the nonspecular surfaces of the segments of the screen by a laser beam appears to move to an observer having abnormal eyesight.
Inventors
- 👤 Horst E Groneberg
- 👤 Kenneth A Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
A; A61; A61B; A61B3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
166 words
In an apparatus for testing eyes including a source of a continuous coherent beam of visible light, a screen having a deflectible screen surface located in view of the eyes being tested onto which the continuous coherent beam of visible light is projected, means for diffusing the beam of continuous coherent visible light to produce a visual pattern appearing on the screen surface, and means for moving the screen surface to produce an apparent movement of the visual pattern for eyes having abnormal refractive conditions, an improved screen having a deflectible screen surface, wherein the improvement comprises: a screen defined by a plurality of individual equally spaced flexible segments, each segment separated from any other segment at least at the screen surface and each segment extending generally from the central area of the screen to generally the periphery of the screen, each of the segments defining a substantially greater screen surface area proximate the periphery of the screen than at the central area of the screen.
Claim 2
Dependent Claim
166 words
In an apparatus for testing eyes including a source of a continuous coherent beam of visible light, a screen having a deflectible screen surface located in view of the eyes being tested onto which the continuous coherent beam of visible light is projected, means for diffusing the beam of continuous coherent visible light to produce a visual pattern appearing on the screen surface, and means for moving the screen surface to produce an apparent movement of the visual pattern for eyes having abnormal refractive conditions, an improved screen having a deflectible screen surface, wherein the improvement comprises: a screen defined by a plurality of individual equally spaced flexible segments, each segment separated from any other segment at least at the screen surface and each segment extending generally from the central area of the screen to generally the periphery of the screen, each of the segments defining a substantially greater screen surface area proximate the periphery of the screen than at the central area of the screen.
Claim 3
Dependent Claim
46 words
In the apparatus for testing eyes, as defined in claim 1, including the improved screen, an improvement for moving the screen surface, wherein the improvement comprises: pneumatic means for deflecting the centrally disposed area of the deflectible screen surface, relative to the periphery of the screen.
Claim 4
Dependent Claim
35 words
The apparatus for testing eyes, as defined in claim 2, wherein the pneumatic means for deflecting the screen surface, comprises: a diaphragm disposed for deflecting the screen surface in either of two generally opposed directions.
Claim 5
Dependent Claim
30 words
The apparatus for testing eyes, as defined in claim 3, wherein, the pneumatiC means includes: a pump in communication with a fluid chamber defined by a housing and the diaphragm.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |