US4478480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Holographic scanner spinner wobble correction system
Assignee: Benson Inc
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Filing: 1982-12-27
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Granted: 1984-10-23
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Expires: 2002-12-27
Abstract
Abstract An optical laser scanning system includes a hologram spinner disc (32) having diffraction grating facets (33) around its periphery. The spinner is susceptible to wobble and translational movement of the facets with respect to a plane perpendicular to the disc axis (35). Corrective means (37) in the form of a ray converging element (37) are provided to collect parallel diffracted rays from the facets in translated positions of wobble and converge such rays to a spacial spot scan (38) on an imaging surface (40). By orienting the spinner such that the diffracted light beam makes a 90° angle with the incident light beam and then providing a parabolic cylinder to direct and focus the diffracted light beam on the imaging surface, the effects of both translational and angular wobble on the image formed are eliminated.
Inventors
- 👤 David E. Doggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:06
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/106; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1285
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
158 words
In an optical scanning system including a source of a monochromatic collimated light beam and a transmission-type hologram spinner having formed thereon a series of plane holographic linear diffraction grating facets, said spinner being placed to diffract said light beam, said spinner being subject to a degree of translational wobble, the improvement comprising means for focusing said light beam in one direction; means mounting said spinner on its axis of rotation such that the angle made by the diffracted light beam with the incident light beam is 90°, and the angle of diffraction is approximately equal to the angle of incidence, said diffracted beam being displaced to a path parallel to the path it would occupy in the absence of translational wobble; corrective means for directing and focusing said diffracted light beam in a direction perpendicular to said one direction; to a position on a moving scan surface which it would occupy in the absence of translational wobble.
Claim 2
Dependent Claim
158 words
In an optical scanning system including a source of a monochromatic collimated light beam and a transmission-type hologram spinner having formed thereon a series of plane holographic linear diffraction grating facets, said spinner being placed to diffract said light beam, said spinner being subject to a degree of translational wobble, the improvement comprising means for focusing said light beam in one direction; means mounting said spinner on its axis of rotation such that the angle made by the diffracted light beam with the incident light beam is 90°, and the angle of diffraction is approximately equal to the angle of incidence, said diffracted beam being displaced to a path parallel to the path it would occupy in the absence of translational wobble; corrective means for directing and focusing said diffracted light beam in a direction perpendicular to said one direction; to a position on a moving scan surface which it would occupy in the absence of translational wobble.
Claim 3
Dependent Claim
22 words
The invention as set forth in claim 1 in which said moving scan surface is a photosensitive surface on a revolving drum.
Claim 4
Dependent Claim
18 words
The invention as set forth in claim 1 in which said corrective means is a cylindrical parabolic mirror.
Claim 5
Dependent Claim
18 words
The invention as set forth in claim 1 in which said corrective means is a cylindrical circular mirror.
Claim 6
Dependent Claim
18 words
The invention as set forth in claim 1 in which said corrective means is a cylindrical converging lens.
References Cited (Backward Citations)
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |