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US4600276A
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Optical disc player lens
Assignee: Eastman Kodak Co
•
Filing: 1984-09-04
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Granted: 1986-07-15
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Expires: 2004-09-04
Abstract
Abstract A lens for use in optical disc players comprising a single positive meniscus element having the following parameters: -SURFACE RADIUS THICKNESS -1 Aspheric 2.269 mm -2 47.7003 mm - The aspheric surface 1 is defined in accordance with the following relationship: <IMAGE> wherein coefficient C=0.2794401 D=-0.1359364x10-2 E=-0.6606383x10-4 F=-0.1056564x10-4 and wherein X is the sag of the aspheric surface from a plane reference surface at a radial distance y from the axis of the lens. The refractive index, N800, of the element is 1.82198 and the Abbé V number is 23.8.
Inventors
- 👤 Joseph R. Bietry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:44
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/18; G02B13/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A lens for an optical disc player, the lens comprising a single positive meniscus element having an aspheric convex surface to be disposed away from the disc and having the following parameters: ______________________________________
SURFACE RADIUS THICKNESS
______________________________________
1 Aspheric 2.269 mm
2 47.7003 mm
______________________________________
the refractive index, N.sub.800, of the element is 1.82198 and the Abbe V
number is 23.8, with the aspheric surface 1 being defined in accordance
with the following relationship:
##EQU4##
with the coefficients having the values: C=0.2794401 D=-0.1359364×10 -2 E=-0.6606383×10 -4 F=-0.1056564×10 -4 and wherein X is the sag of the aspheric surface from a plane reference surface at a radial distance y from the axis of the lens.
Claim 2
Dependent Claim
114 words
A lens for an optical disc player, the lens comprising a single positive meniscus element having an aspheric convex surface to be disposed away from the disc and having the following parameters: ______________________________________
SURFACE RADIUS THICKNESS
______________________________________
1 Aspheric 2.269 mm
2 47.7003 mm
______________________________________
the refractive index, N.sub.800, of the element is 1.82198 and the Abbe V
number is 23.8, with the aspheric surface 1 being defined in accordance
with the following relationship:
##EQU4##
with the coefficients having the values: C=0.2794401 D=-0.1359364×10 -2 E=-0.6606383×10 -4 F=-0.1056564×10 -4 and wherein X is the sag of the aspheric surface from a plane reference surface at a radial distance y from the axis of the lens.
References Cited (Backward Citations)
US4415238A
Cited
US4469413A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |