Patent US4758068A successfully refreshed from Google Patents.
US4758068A
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Controlling radiation beam diameters
Assignee: Crosfield Electronics Ltd
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Filing: 1987-01-22
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Granted: 1988-07-19
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Expires: 2007-01-22
Abstract
Abstract The invention relates to a method and an apparatus for reducing the diameter tolerance of a laser beam. A lens (3) is positioned so that one of the focal planes of the lens (3) is in the region of a limit (5) of the Rayleigh range of the beam (19). The lens (3) forms a second beam waist at a position (6), where a modulator (10) is placed. The beam (21) then passes through beam expansion apparatus (11,12,13) before being collimated by a lens (14). The collimated beam (25) is then focussed to a third beam waist at the recording drum (17), via a lens (18) and mirror (15).
Inventors
- 👤 John E. Aughton
- 👤 James H. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:32
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; G02B6/4206; B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/0604; B23K26/064; B23K26/0643; B23K26/0648; B23K26/0665; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S372/00; Y10S372/705
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
55 words
A method of reducing the tolerance in the diameter of a beam of coherent radiation comprising the fundamental transverse mode and which defines a Rayleigh range, the method comprising positioning a lens such that the focal plane defined by said lens is in the region of a limit of said Rayleigh range of said beam.
Claim 2
Independent Claim
55 words
A method of reducing the tolerance in the diameter of a beam of coherent radiation comprising the fundamental transverse mode and which defines a Rayleigh range, the method comprising positioning a lens such that the focal plane defined by said lens is in the region of a limit of said Rayleigh range of said beam.
Claim 3
Dependent Claim
15 words
A method according to claim 1, wherein said beam comprises a beam of optical radiation.
Claim 4
Dependent Claim
53 words
Apparatus for generating a beam of coherent radiation comprising said fundamental transverse mode and which defines a Rayleigh range, said apparatus comprising a radiation beam generator; and a lens positioned such that the focal plane defined by said lens is in the region of a limit of said Rayleigh range of said beam.
Claim 5
Dependent Claim
53 words
Apparatus for generating a beam of coherent radiation comprising said fundamental transverse mode and which defines a Rayleigh range, said apparatus comprising a radiation beam generator; and a lens positioned such that the focal plane defined by said lens is in the region of a limit of said Rayleigh range of said beam.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 3, wherein an acousto-optic modulator is situated at a position at which said radiation beam forms a waist.
Claim 7
Dependent Claim
35 words
An image recording system including apparatus according to claim 3, wherein a record medium support is positioned such that a record medium is situated at a position at which said radiation beam forms a waist.
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) | 1991-07-19 | 1992-01-18 | 1992-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-19 | 1996-01-18 | 1996-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-19 | 2000-01-18 | 2000-07-19 | $7700.00 | Window Closed / Lapsed |