US4184748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for expanding practically parallel light rays
Assignee: Individual
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Filing: 1977-10-26
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Granted: 1980-01-22
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Expires: 1997-10-26
Abstract
Abstract A parallel pencil of light, for example, a laser beam, is expanded by means of a cylindrical lens. The lens is fully cylindrical and has an optically thinner medium of cylindrical shape in its interior. The lens is arranged relative to the pencil of light so that total reflection occurs at the interface with the optically thinner medium.
Inventors
- 👤 Hans-Peter Kugler
- 👤 Norbert Eisenreich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:34
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A device comprising means for providing practically parallel light rays, a cylindrical lens for expanding the practically parallel light rays and means for detecting objects moving outside of the lens said lens being fully cylindrical in design and having an interior cylindrical portion and a peripheral portion surrounding said interior cylindrical portion with an interface between said portions, said interior cylindrical portion being formed from a medium which is optically thinner than said peripheral portion, and said lens being arranged to be disposed relative to said practically parallel light rays such as to give total reflection at the said interface, the light rays being expanded two-dimensionally to an aperture angle of up to 360° with an intensity distribution that is practically constant.
Claim 2
Independent Claim
122 words
A device comprising means for providing practically parallel light rays, a cylindrical lens for expanding the practically parallel light rays and means for detecting objects moving outside of the lens said lens being fully cylindrical in design and having an interior cylindrical portion and a peripheral portion surrounding said interior cylindrical portion with an interface between said portions, said interior cylindrical portion being formed from a medium which is optically thinner than said peripheral portion, and said lens being arranged to be disposed relative to said practically parallel light rays such as to give total reflection at the said interface, the light rays being expanded two-dimensionally to an aperture angle of up to 360° with an intensity distribution that is practically constant.
Claim 3
Dependent Claim
20 words
A device according to claim 1, wherein said lens has an external surface which is provided with a reflective coating.
Claim 4
Dependent Claim
16 words
A device according to claim 1, wherein said interior cylindrical portion is coaxial to the lens.
Claim 5
Dependent Claim
16 words
A device according to claim 1, wherein said lens is in the form of a tube.
Claim 6
Dependent Claim
13 words
A device according to claim 4, wherein said tube has a circular cross-section.
Claim 7
Dependent Claim
13 words
A device according to claim 4, wherein said tube is a glass tube.
Claim 8
Dependent Claim
31 words
A device according to claim 1, wherein the lens is arranged on an adjusting means for changing the angular position of the lens relative to the said practically parallel light rays.
Claim 9
Dependent Claim
25 words
A device according to claim 7, characterised in that the adjusting means is fixedly connected to said means for providing the practically parallel light rays.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |