EP0342936A2
Expired / Lapsed
EP
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Scanning optical apparatus
Assignee: Canon Inc
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Filing: 1989-05-16
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Granted: —
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Expires: 2009-05-16
Abstract
Abstract A scanning optical apparatus according to the present invention comprises a light source (2), a modulator (1) for modulating a light flux emitted from the light source (2), an image forming device (6a, 6b, 6c) for forming an image of the light flux from the light source to a predetermined position, a deflector (5) for deflecting the light flux from the light source in a predetermined position, a photosensitive device (8) for sensing the light flux deflected by the deflector (5), an adjusting device (10) for adjusting an image forming position of the light flux by the image forming device (6a, 6b, 6c) in correspondence to a signal obtained by the photosensitive device (8) and an inhibiting device (11) for inhibiting the operation of the adjusting device (10) when the light flux emitted from the light source (2) is being modulated by the modulator (1) in correspondence to a predetermined signal. By the scanning optical apparatus of the invention, the focal deviation can be always stably corrected and a stable image with high density can be obtained.
Inventors
- 👤 Yoshihiko Hirose
- 👤 Hitoshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/127; G02B26/128; G02B27/00; G02B27/0025; G02B27/0031; H04N1/00; H04N1/024; H04N1/032; H04N1/036; H04N1/04; H04N1/113; H04N1/1135
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux which is emitted from said light source section; image forming means for forming an image of the light flux from the light source section to a predetermined position; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photo-sensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; and inhibiting means for inhibiting the operation of said adjusting means when the light flux emitted from the light source section is being modulated by said modulating means in correspondence to a predetermined signal.
Claim 2
Dependent Claim
133 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux which is emitted from said light source section; image forming means for forming an image of the light flux from the light source section to a predetermined position; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photo-sensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; and inhibiting means for inhibiting the operation of said adjusting means when the light flux emitted from the light source section is being modulated by said modulating means in correspondence to a predetermined signal.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1, wherein said adjusting means includes means for moving a part of the image forming means.
Claim 4
Dependent Claim
14 words
An apparatus according to claim 1, wherein said predetermined signal is an image signal.
Claim 5
Dependent Claim
116 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux emitted from said light source section; deflecting means for deflecting the light flux from the light source section in a predetermined direction; lens means arranged between the light source section and the deflecting means; photosensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting the operation of the lens means in correspondence to a signal obtained by said photosensitive means; and inhibiting means for inhibiting the operation of the adjusting means when the light flux emitted from the light source section is being modulated by the modulating means in correspondence to a predetermined signal.
Claim 6
Dependent Claim
116 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux emitted from said light source section; deflecting means for deflecting the light flux from the light source section in a predetermined direction; lens means arranged between the light source section and the deflecting means; photosensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting the operation of the lens means in correspondence to a signal obtained by said photosensitive means; and inhibiting means for inhibiting the operation of the adjusting means when the light flux emitted from the light source section is being modulated by the modulating means in correspondence to a predetermined signal.
Claim 7
Dependent Claim
138 words
A scanning optical apparatus comprising: a light source section; image forming means for forming an image of a light flux from said light source section; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photosensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; modulating means for modulating the light flux emitted from the light source section; and control means for controlling said modulating means and said adjusting means, said control means inhibiting the operation of the adjusting means when the light flux emitted from the light source section is being modulated by the modulating means in correspondence to a predetermined signal.
Claim 8
Dependent Claim
138 words
A scanning optical apparatus comprising: a light source section; image forming means for forming an image of a light flux from said light source section; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photosensitive means for sensing the light flux deflected by said deflecting means; adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; modulating means for modulating the light flux emitted from the light source section; and control means for controlling said modulating means and said adjusting means, said control means inhibiting the operation of the adjusting means when the light flux emitted from the light source section is being modulated by the modulating means in correspondence to a predetermined signal.
Claim 9
Dependent Claim
131 words
A scanning optical apparatus comprising: a solid laser element; a laser driver connected to said solid laser element; an image forming optical system for forming an image of the light flux from the solid laser element to a predetermined position; a deflector to deflect the light flux from the solid laser element in a predetermined direction; a photodetector to detect the light flux deflected by said deflector; an image forming optical system driving section to move a part of the image forming optical system in correspondence to a signal detected by said photodetector; and inhibiting means for inhibiting the operation of said image forming optical system driving section when the light flux emitted from the solid laser element is being modulated by said laser driver in correspondence to a predetermined signal.
Claim 10
Dependent Claim
131 words
A scanning optical apparatus comprising: a solid laser element; a laser driver connected to said solid laser element; an image forming optical system for forming an image of the light flux from the solid laser element to a predetermined position; a deflector to deflect the light flux from the solid laser element in a predetermined direction; a photodetector to detect the light flux deflected by said deflector; an image forming optical system driving section to move a part of the image forming optical system in correspondence to a signal detected by said photodetector; and inhibiting means for inhibiting the operation of said image forming optical system driving section when the light flux emitted from the solid laser element is being modulated by said laser driver in correspondence to a predetermined signal.
Claim 11
Dependent Claim
172 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux which is emitted from said light source section; image forming means for forming an image of the light flux from the light source section to a predetermined position; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photosensitive means for sensing the light flux deflected by said deflecting means; and adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means, wherein the image forming position of the light flux is adjusted by making said adjusting means operative just before the light flux emitted from the light source section is modulated by said modulating means in correspondence to a predetermined signal, and after completion of the adjustment of the image forming position, the light flux emitted from the light source section is modulated by said modulating means in correspondence to said predetermined signal.
Claim 12
Dependent Claim
172 words
A scanning optical apparatus comprising: a light source section; modulating means for modulating a light flux which is emitted from said light source section; image forming means for forming an image of the light flux from the light source section to a predetermined position; deflecting means for deflecting the light flux from the light source section in a predetermined direction; photosensitive means for sensing the light flux deflected by said deflecting means; and adjusting means for adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means, wherein the image forming position of the light flux is adjusted by making said adjusting means operative just before the light flux emitted from the light source section is modulated by said modulating means in correspondence to a predetermined signal, and after completion of the adjustment of the image forming position, the light flux emitted from the light source section is modulated by said modulating means in correspondence to said predetermined signal.
Claim 13
Dependent Claim
114 words
A scanning method in a scanning optical apparatus comprising the steps of: leading a light flux which is emitted from a light source section to a predetermined position through image forming means and deflecting means; sensing the led light flux by photosensitive means arranged at a predetermined position; adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; and modulating the light flux emitted from the light source section in correspondence to a predetermined signal after completion of the adjusting of the image forming position and scanning said modulated light flux through said image forming means and said deflecting means.
Claim 14
Dependent Claim
114 words
A scanning method in a scanning optical apparatus comprising the steps of: leading a light flux which is emitted from a light source section to a predetermined position through image forming means and deflecting means; sensing the led light flux by photosensitive means arranged at a predetermined position; adjusting an image forming position of the light flux by said image forming means in correspondence to a signal obtained by said photosensitive means; and modulating the light flux emitted from the light source section in correspondence to a predetermined signal after completion of the adjusting of the image forming position and scanning said modulated light flux through said image forming means and said deflecting means.
Claim 15
Dependent Claim
14 words
A method according to claim 8, wherein said predetermined signal is an image signal.
Claim 16
Dependent Claim
45 words
Correction apparatus for use in scanning optical apparatus and for detecting and correcting a focal position deviation of an image spot of a light flux on a scanning surface, comprising a focal position adjusting means which is rendered inoperative during modulation of the light flux.
Claim 17
Dependent Claim
45 words
Correction apparatus for use in scanning optical apparatus and for detecting and correcting a focal position deviation of an image spot of a light flux on a scanning surface, comprising a focal position adjusting means which is rendered inoperative during modulation of the light flux.
References Cited (Backward Citations)
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