US5390050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eccentric Fresnel lens sheet and method of making same
Assignee: Canon Inc
•
Filing: 1993-07-06
•
Granted: 1995-02-14
•
Expires: 2013-07-06
Abstract
Abstract An eccentric Fresnel lens is formed from a concentric Fresnel lens sheet or Fresnel lens sheet mold. The concentric Fresnel lens sheet or mold is cut to produce an eccentric Fresnel lens having a center offset from the optical axis of the concentric Fresnel lens.
Inventors
- 👤 Haruyuki Yanagi
- 👤 Nobuo Minoura
- 👤 Katsumi Kurematsu
- 👤 Hideaki Mitsutake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:26
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/00269; G; G02; G02B; G02B3/00; G02B3/02; G02B3/08; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a rectangularly shaped concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
Claim 2
Independent Claim
50 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a rectangularly shaped concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
Claim 3
Independent Claim
64 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a mold for a concentric Fresnel lens having an optical axis; cutting the mold for the concentric Fresnel lens to produce a mold for an eccentric Fresnel lens which is offset from the optical axis; and molding an eccentric Fresnel lens sheet by using the mold for eccentric Fresnel lens.
Claim 4
Independent Claim
64 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a mold for a concentric Fresnel lens having an optical axis; cutting the mold for the concentric Fresnel lens to produce a mold for an eccentric Fresnel lens which is offset from the optical axis; and molding an eccentric Fresnel lens sheet by using the mold for eccentric Fresnel lens.
Claim 5
Independent Claim
84 words
A method of manufacturing an eccentric Fresnel lens sheet which deflects a light beam obliquely incident on a surface of said lens sheet and causes the light beam to exit said lens sheet in a direction substantially normal to said lens sheet surface, comprising the steps of: forming a rectangularly shaped concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
Claim 6
Independent Claim
84 words
A method of manufacturing an eccentric Fresnel lens sheet which deflects a light beam obliquely incident on a surface of said lens sheet and causes the light beam to exit said lens sheet in a direction substantially normal to said lens sheet surface, comprising the steps of: forming a rectangularly shaped concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
Claim 7
Independent Claim
67 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a mold for a concentric Fresnel lens having an optical axis; cutting the mold for the concentric Fresnel lens to produce a plurality of molds for eccentric Fresnel lens which is offset from the optical axis; and producing an eccentric Fresnel lens sheet by using each of the molds for eccentric Fresnel lens.
Claim 8
Independent Claim
67 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a mold for a concentric Fresnel lens having an optical axis; cutting the mold for the concentric Fresnel lens to produce a plurality of molds for eccentric Fresnel lens which is offset from the optical axis; and producing an eccentric Fresnel lens sheet by using each of the molds for eccentric Fresnel lens.
Claim 9
Independent Claim
48 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
Claim 10
Independent Claim
48 words
A method of manufacturing an eccentric Fresnel lens sheet, comprising the steps of: forming a concentric Fresnel lens sheet having an optical axis; and cutting the concentric Fresnel lens sheet to produce a plurality of eccentric Fresnel lens sheets, each of which does not include the optical axis.
References Cited (Backward Citations)
US439027A
Cited
US2510344A
Cited
US2441747A
Cited
GB692569A
Cited
US3263079A
Cited
FR1487841A
Cited
US3628854A
Cited
US3848980A
Cited
US3972593A
Cited
US3982822A
Cited
US4076384A
Cited
US4173399A
Cited
US4152047A
Cited
US4147408A
Cited
US4374609A
Cited
US4391495A
Cited
US4458993A
Cited
US4439027A
Cited
US4468092A
Cited
US4573121A
Cited
US4525029A
Cited
US4482206A
Cited
US4512631A
Cited
US4509822A
Cited
US4550977A
Cited
JPS6061738A
Cited
US4725134A
Cited
US4674836A
Cited
US4666248A
Cited
US4721361A
Cited
US4701020A
Cited
US4708435A
Cited
US4919518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-02-13 | 1998-08-15 | 1999-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-13 | 2002-08-15 | 2003-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-13 | 2006-08-15 | 2007-02-14 | $7700.00 | Window Closed / Lapsed |