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US5371632A
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US
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Single aspherical plano-convex collimator lens
Assignee: Minolta Co Ltd
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Filing: 1993-07-28
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Granted: 1994-12-06
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Expires: 2013-07-28
Abstract
Abstract A collimator lens system has a single plano-convex lens and a plane parallel plate. An aspherical surface of the single plano-convex lens is convex to the magnification-larger-than-unity side. The collimator lens system fulfills the following conditions: ##EQU1## where n represents a refractive index of the single plano-convex lens, d represents an axial thickness of the single plano-convex lens, f represents a focal length of the single plano-convex lens and dg represents a thickness of the plane parallel plate.
Inventors
- 👤 Toshio Naiki
- 👤 Satoshi Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:51
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
A collimator lens system comprising from a magnification-larger-than-unity side a single plano-convex lens convex to the magnification-larger-than-unity side and a plane parallel plate, wherein the convex surface of the single plano-convex lens is aspherical and wherein the following conditions are fulfilled: ##EQU11## where n represents a refractive index of the single plano-convex lens, d represents an axial thickness of the single plano-convex lens, f represents a focal length of the single plano-convex lens and dg represents a thickness of the plane parallel plate.
Claim 2
Dependent Claim
83 words
A collimator lens system comprising from a magnification-larger-than-unity side a single plano-convex lens convex to the magnification-larger-than-unity side and a plane parallel plate, wherein the convex surface of the single plano-convex lens is aspherical and wherein the following conditions are fulfilled: ##EQU11## where n represents a refractive index of the single plano-convex lens, d represents an axial thickness of the single plano-convex lens, f represents a focal length of the single plano-convex lens and dg represents a thickness of the plane parallel plate.
Claim 3
Dependent Claim
17 words
A collimator lens system as claimed in claim 1, wherein the following condition is further fulfilled: ##EQU12##
Claim 4
Dependent Claim
17 words
A collimator lens system as claimed in claim 1, wherein the following condition is further fulfilled: ##EQU13##
Claim 5
Dependent Claim
83 words
A collimator lens system comprising from a magnification-larger-than-unity side a single plano-convex lens convex to the magnification-larger-than-unity side and a plane parallel plate, wherein the convex surface of the single plano-convex lens is aspherical and wherein the following conditions are fulfilled: ##EQU14## where n represents a refractive index of the single plano-convex lens, d represents an axial thickness of the single plano-convex lens, f represents a focal length of the single plano-convex lens, and dg represents a thickness of the plane parallel plate.
Claim 6
Dependent Claim
83 words
A collimator lens system comprising from a magnification-larger-than-unity side a single plano-convex lens convex to the magnification-larger-than-unity side and a plane parallel plate, wherein the convex surface of the single plano-convex lens is aspherical and wherein the following conditions are fulfilled: ##EQU14## where n represents a refractive index of the single plano-convex lens, d represents an axial thickness of the single plano-convex lens, f represents a focal length of the single plano-convex lens, and dg represents a thickness of the plane parallel plate.
Claim 7
Dependent Claim
17 words
A collimator lens system as claimed in claim 4, wherein the following condition is further fulfilled: ##EQU15##
Claim 8
Dependent Claim
17 words
A collimator lens system as claimed in claim 4, wherein the following condition is further fulfilled: ##EQU16##
References Cited (Backward Citations)
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JPS61132915A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |