US4068197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for stabilizing beam for exposure
Assignee: Ushio Denki KK
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Filing: 1976-06-23
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Granted: 1978-01-10
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Expires: 1996-06-23
Abstract
Abstract An apparatus for stabilizing a laser beam to be used for exposure in an image-reproducing apparatus wherein said beam is suitably controlled by image signals obtained from the scanning of the original beam as modulated. A laser beam, after being suitably modulated by an ultrasonic light modulator, is branched out by a half mirror into two beams, one of which is to be used for exposing a photosensitive material and the other is used as a negative feedback signal. This feedback signal is then added to an image signal so that a linearity between exposing beam and image signals are greatly improved. Further, by improving the linearity of exposing beam, the stability of the exposing beam is simultaneously improved.
Inventors
- 👤 Taro Yamazaki
- 👤 Kazuhiko Ohnishi
- 👤 Kiyoshi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:00
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/4005; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204; G06K15/1209; G06K15/1214; H04N1/40037
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
An apparatus for stabilizing beam to be used for exposure in an image-reproducing apparatus wherein said beam is controlled by image signals obtained from the scanning of a color original, said apparatus comprising; a. a laser beam source, b. an ultrasonic light modulator adapted to modulate laser beam emitted from said laser beam source, c. a half mirror adapted to branch out said beam modulated by said ultrasonic light modulator into two modulated beams, d. a photoelectric transducer adapted to photoelectrically transduce one of said two modulated beams, e. a comparison amplifier adapted to compare output signals from said photoelectric transducer with said image signals, f. an amplitude modulator adapted to modulate the amplitude of a sine wave of required frequency by means of output signals from said comparison amplifier, and g. a drive circuit adapted to drive an ultrasonic vibrator attached to said ultrasonic light modulator by means of output signals from said amplitude modulator.
Claim 2
Independent Claim
156 words
An apparatus for stabilizing beam to be used for exposure in an image-reproducing apparatus wherein said beam is controlled by image signals obtained from the scanning of a color original, said apparatus comprising; a. a laser beam source, b. an ultrasonic light modulator adapted to modulate laser beam emitted from said laser beam source, c. a half mirror adapted to branch out said beam modulated by said ultrasonic light modulator into two modulated beams, d. a photoelectric transducer adapted to photoelectrically transduce one of said two modulated beams, e. a comparison amplifier adapted to compare output signals from said photoelectric transducer with said image signals, f. an amplitude modulator adapted to modulate the amplitude of a sine wave of required frequency by means of output signals from said comparison amplifier, and g. a drive circuit adapted to drive an ultrasonic vibrator attached to said ultrasonic light modulator by means of output signals from said amplitude modulator.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, wherein there is further provided an aperture plate for picking up only the modulated beam of the strongest intensity.
Claim 4
Dependent Claim
15 words
An apparatus according to claim 1, wherein a phototube is utilized as said photoelectric transducer.
Claim 5
Dependent Claim
40 words
An apparatus according to claim 1, wherein the distance between a travelling path of said laser beam and said ultrasonic vibrator of the ultrasonic light modulator is made as short as possible; thereby lessening the possibility of a reply delay.
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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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |