US4768875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for making contactless section-like measurements of the form of curved optically effective surfaces
Assignee: Carl Zeiss AG
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Filing: 1986-10-10
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Granted: 1988-09-06
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Expires: 2006-10-10
Abstract
Abstract A light section is generated on the object with an arrangement for the contactless section-like form measurement of curved surfaces by means of an optical detector functioning in a raster-like manner. The light section is received at an angle inclined to the viewing axis by an anamorphotic system and imaged onto a receiver.
Inventors
- 👤 Ortwin Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:04
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/107; G; G01; G01B; G01B11/00; G01B11/24; G01B11/25; G01B11/2545
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
Arrangement for making contactless section-like measurements of the form of the cornea of the eye, the arrangement comprising: an apparatus for generating a plurality of light sections on the surface of the cornea, the apparatus having a main axis and including: slit means mounted on said axis and defining a slit; projection lens means mounted on said axis for projecting said slit onto said corneal surface; and, an imaging anamorphotic system for receiving an image of said light section at a predetermined angle with respect to said axis and for forming anamorphotic images of said light sections wherein the enlargement of said images is different in two directions running at right angles to each other; said system including a deflection element and cylinder lens means coacting therewith for imaging a point of said surface lying on said axis into an image point also on said axis; and, an optical detector arranged on said axis and receiving said anamorphotic images thereon for computing the total corneal surface from said light sections.
Claim 2
Dependent Claim
170 words
Arrangement for making contactless section-like measurements of the form of the cornea of the eye, the arrangement comprising: an apparatus for generating a plurality of light sections on the surface of the cornea, the apparatus having a main axis and including: slit means mounted on said axis and defining a slit; projection lens means mounted on said axis for projecting said slit onto said corneal surface; and, an imaging anamorphotic system for receiving an image of said light section at a predetermined angle with respect to said axis and for forming anamorphotic images of said light sections wherein the enlargement of said images is different in two directions running at right angles to each other; said system including a deflection element and cylinder lens means coacting therewith for imaging a point of said surface lying on said axis into an image point also on said axis; and, an optical detector arranged on said axis and receiving said anamorphotic images thereon for computing the total corneal surface from said light sections.
Claim 3
Dependent Claim
50 words
The arrangement of claim 1, comprising two of said anamorphotic systems arranged symmetrically about said axis, said systems having respective deflection elements and respective cylinder lens means and being adapted for imaging a point of said surfaced lying on said axis into a congruent image point also on said axis.
Claim 4
Dependent Claim
26 words
The arrangement of claim 2, said optical detector being a monitor which provides an overview image of the eye to be examined for adjusting said apparatus.
References Cited (Backward Citations)
US4019813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |