US4852980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system
Assignee: Dainippon Screen Manufacturing Co Ltd
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Filing: 1987-01-16
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Granted: 1989-08-01
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Expires: 2007-01-16
Abstract
Abstract An optical system for illuminating an object, including an entrance pupil for receiving light from a light source, an exit pupil for passing the light received to an object to be illuminated, and an optical axis which extends through the optical sytem to the light source and the object respectively, wherein the entrance height of the light received in the entrance pupil is substantially proportioned to the tangent of the exit angle in the exit pupil.
Inventors
- 👤 Nagata Shinichi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:27
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/18; G02B3/00; G02B3/02; G02B3/04; G02B19/00; G02B19/0004; G02B19/0028; G02B19/0033; G02B19/0047
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
An optical system for use in illuminating an object, comprising: a light source; lens means having an entrance pupil for receiving light from the light source and an exit pupil for passing the light received to the object; and an optical axis which extends through the lens means to the light source and the object, respectively, wherein the light received in the entrance pupil has an entrance height which is substantially proportioned to the tangent of the exit angle in the exit pupil.
Claim 2
Dependent Claim
83 words
An optical system for use in illuminating an object, comprising: a light source; lens means having an entrance pupil for receiving light from the light source and an exit pupil for passing the light received to the object; and an optical axis which extends through the lens means to the light source and the object, respectively, wherein the light received in the entrance pupil has an entrance height which is substantially proportioned to the tangent of the exit angle in the exit pupil.
Claim 3
Dependent Claim
18 words
An optical system as set forth in claim 1, wherein the entrance pupil is conjugated with the object.
Claim 4
Dependent Claim
70 words
An optical system as set forth in claim 1 wherein the lens means includes an aspherical lens having a surface designed so as to satisfy the formula: ##EQU19## where n 1 is the refractive index of a prior medium to the surface of the aspherical lens, n 2 is the refractive index of a posterior medium to the surface thereof, and h is an entrance height in the entrance pupil.
Claim 5
Dependent Claim
94 words
An illumination system for illuminating an object, comprising: a light source; and a fly-eye lens structure including a plurality of respective optical systems, said respective optical systems each including an entrance pupil for receiving light from the light source, an exit pupil for passing the light received to the object, and an optical axis which extends to the light source and the object respectively, through the optical system, wherein the entrance height of the light received in the entrance pupil is substantially proportioned to the tangent of the exit angle in the exit pupil.
Claim 6
Dependent Claim
94 words
An illumination system for illuminating an object, comprising: a light source; and a fly-eye lens structure including a plurality of respective optical systems, said respective optical systems each including an entrance pupil for receiving light from the light source, an exit pupil for passing the light received to the object, and an optical axis which extends to the light source and the object respectively, through the optical system, wherein the entrance height of the light received in the entrance pupil is substantially proportioned to the tangent of the exit angle in the exit pupil.
References Cited (Backward Citations)
US3702395A
Cited
US4412726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |