Patent US4190867A successfully refreshed from Google Patents.
US4190867A
Expired / Lapsed
US
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Laser COM with line deflection mirror inertia compensation
Assignee: Fujifilm Holdings Corp
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Filing: 1978-04-05
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Granted: 1980-02-26
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Expires: 1998-04-05
Abstract
Abstract A vertical line deflection, mirror 8 in a laser COM is driven by a staircase waveform generated in response to scan line synchronizing signals. To avoid data character compression or expansion following a stop or data line skipping operation due to the mirror inertia, video signal generation is delayed for several scan lines following such an operation to allow the mirror to reach a constant rotational speed.
Inventors
- 👤 Masahiro Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:46
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/127; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1209; G06K15/1219; G06K15/1276
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
In a method of two-dimensionally scanning a recording light beam intensity modulated in accordance with a data signal, including successively horizontally deflecting the light beam and simultaneously vertically deflecting it with a rotating mirror, a method of eliminating character image distortion immediately following a vertical scan stop or data line skipping operation due to the inertia of the rotating mirror, characterized by: decreasing the intensity of the light beam to a level below a recording level immediately following a vertical scan stop or data line skipping operation for a period of time sufficient to allow the rotating mirror to reach a substantially constant rotational speed.
Claim 2
Dependent Claim
105 words
In a method of two-dimensionally scanning a recording light beam intensity modulated in accordance with a data signal, including successively horizontally deflecting the light beam and simultaneously vertically deflecting it with a rotating mirror, a method of eliminating character image distortion immediately following a vertical scan stop or data line skipping operation due to the inertia of the rotating mirror, characterized by: decreasing the intensity of the light beam to a level below a recording level immediately following a vertical scan stop or data line skipping operation for a period of time sufficient to allow the rotating mirror to reach a substantially constant rotational speed.
Claim 3
Dependent Claim
61 words
A method as defined in claim 1, wherein the light beam is a laser beam, the rotating mirror is driven by a staircase waveform stepped in response to horizontal line scan synchronizing signals, and the beam intensity is decreased by delaying the generation of a data character signal until a predetermined number of horizontal line scan synchronizing signals have been counted.
Claim 4
Dependent Claim
110 words
In an apparatus for two-dimensionally scanning a recording light beam intensity modulated in accordance with a data signal, including means for successively horizontally deflecting the light beam and means for simultaneously vertically deflecting it with a rotating mirror, means for eliminating character image distortion immediately following a vertical scan stop or data line skipping operation due to the inertia of the rotating mirror, characterized by: means for decreasing the intensity of the light beam to a level below a recording level immediately following a vertical scan stop or data line skipping operation for a period of time sufficient to allow the rotating mirror to reach a substantially constant rotational speed.
Claim 5
Dependent Claim
110 words
In an apparatus for two-dimensionally scanning a recording light beam intensity modulated in accordance with a data signal, including means for successively horizontally deflecting the light beam and means for simultaneously vertically deflecting it with a rotating mirror, means for eliminating character image distortion immediately following a vertical scan stop or data line skipping operation due to the inertia of the rotating mirror, characterized by: means for decreasing the intensity of the light beam to a level below a recording level immediately following a vertical scan stop or data line skipping operation for a period of time sufficient to allow the rotating mirror to reach a substantially constant rotational speed.
Claim 6
Dependent Claim
63 words
An apparatus as defined in claim 3, wherein the light beam is a laser beam, the rotating mirror is driven by a staircase waveform stepped in response to horizontal line scan synchronizing signals, and the beam intensity is decreased by means for delaying the generation of a data character signal until a predetermined number of horizontal line scan synchronizing signals have been counted.
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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |