Patent US4998191A successfully refreshed from Google Patents.
US4998191A
Expired / Lapsed
US
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Illuminating optical device
Assignee: Pentax Corp
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Filing: 1989-10-27
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Granted: 1991-03-05
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Expires: 2009-10-27
Abstract
Abstract An illuminating optical device of the type in which light from a light source is made incident on a condenser lens through a fly-eye lens a light transmitting object to be illuminated is disposed between the condenser lens and a projection optical system. The degree of surface finish of the emergence surface of the fly-eye lens is made lower than that of the incident surface.
Inventors
- 👤 Yasuyuki Tejima
- 👤 Ryota Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:13
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/0006; G02B3/0037; G02B3/0056; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G03; G03F; G03F7/00; G03F7/20; G03F7/2002; G03F7/70; G03F7/70058
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
An illuminating optical device in which light from a light source is incident on a condenser lens, through a fly-eye lens, with a light-transmitting object to be illuminated disposed between said condenser lens and a projection optical system, wherein the degree of surface finish of the emergence surface of said fly-eye lens is lower that that of the incidence surface.
Claim 2
Dependent Claim
60 words
An illuminating optical device in which light from a light source is incident on a condenser lens, through a fly-eye lens, with a light-transmitting object to be illuminated disposed between said condenser lens and a projection optical system, wherein the degree of surface finish of the emergence surface of said fly-eye lens is lower that that of the incidence surface.
Claim 3
Dependent Claim
17 words
An illuminating optical device according to claim 1, wherein said fly-eye lens is formed of quartz glass.
Claim 4
Dependent Claim
27 words
An illuminating optical device according to claim 1, wherein said fly-eye lens comprises a minute lens which is a square drum lens having a square cross section.
Claim 5
Dependent Claim
60 words
An illuminating optical device comprising a light diffusing element in the form of a fly-eye lens which converts information about the angle of light rays incident thereon into positional information, wherein one of the two end faces, respectively constituting incidence and emergence surfaces, is less optically defective than the other, said one end face being defined as the incidence surface.
Claim 6
Dependent Claim
60 words
An illuminating optical device comprising a light diffusing element in the form of a fly-eye lens which converts information about the angle of light rays incident thereon into positional information, wherein one of the two end faces, respectively constituting incidence and emergence surfaces, is less optically defective than the other, said one end face being defined as the incidence surface.
Claim 7
Dependent Claim
17 words
An illuminating optical device according to claim 4, wherein said fly-eye lens is formed of quartz glass.
Claim 8
Dependent Claim
27 words
An illuminating optical device according to claim 4, wherein said fly-eye lens comprises a minute lens which is a square drum lens having a square cross section.
Claim 9
Dependent Claim
44 words
A fly-eye lens which converts information about the angle of light rays incident thereon into positional information, wherein two end faces, respectively comprising incidence and emergence surfaces, differ from each other in the degree of surface finish determined from the optical point of view.
Claim 10
Dependent Claim
44 words
A fly-eye lens which converts information about the angle of light rays incident thereon into positional information, wherein two end faces, respectively comprising incidence and emergence surfaces, differ from each other in the degree of surface finish determined from the optical point of view.
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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) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |