US4710779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording apparatus
Assignee: Konica Minolta Inc
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Filing: 1981-11-13
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Granted: 1987-12-01
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Expires: 2001-11-13
Abstract
Abstract Herein disclosed is a recording apparatus for using a semiconductor laser 1 as a light source so that the scanning operation may be conducted with the laser beam which has been modulated on the basis of picture information. The drive current of the semiconductor laser 1 for making the monitor current of an optical output constant is determined before the beginning of a recording period so that the drive current may be used as that of the semiconductor laser 1 during the recording period.
Inventors
- 👤 Shinsuke Funaki
- 👤 Yuichi Akanabe
- 👤 Hiroaki Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:43
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; G06K15/1219; H04N1/04; H04N1/047; H04N1/053; H04N1/40037; H04N1/113; H04N1/1135; H04N1/12; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04732; H04N2201/04744; H04N2201/04753; H04N2201/04758; H04N2201/04767
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
In a recording method wherein a scanning operation is conducted with a light beam which is modulated on the basis of image information, the improvement which comprises driving a laser beam before scanning a leading edge of a page, generating a photoconverted signal of an optical output of said laser beam, repeatedly controlling said optical output based on a difference signal corresponding to a difference between said photoconverted signal and a reference signal so as to reduce said difference and maintaining a power supply to a controlled value during a period of recording said page.
Claim 2
Dependent Claim
95 words
In a recording method wherein a scanning operation is conducted with a light beam which is modulated on the basis of image information, the improvement which comprises driving a laser beam before scanning a leading edge of a page, generating a photoconverted signal of an optical output of said laser beam, repeatedly controlling said optical output based on a difference signal corresponding to a difference between said photoconverted signal and a reference signal so as to reduce said difference and maintaining a power supply to a controlled value during a period of recording said page.
Claim 3
Dependent Claim
43 words
The method of claim 1 further comprising scanning an area preceding a leading edge during said controlling, continuing said scanning until said recording is started, and positively developing said page with a toner wherein said toner is attached only on a non-exposed area.
Claim 4
Dependent Claim
120 words
In a recording apparatus wherein scanning is conducted by means of a light beam which is modulated on the basis of image information, the improvement which comprises a semi-conductor laser, a circuit for driving said semi-conductor laser, a circuit for generating a timing signal for driving said laser before scanning a leading edge of a page, a circuit for detecting an optical output of said laser and generating a photoconverted signal, a circuit for comparing said photoconverted signal with a reference signal, a circuit for generating a constant signal for making said optical output constant on the basis of a signal from said comparing circuit, and a circuit for holding said constant signal during a recording period of said page.
Claim 5
Dependent Claim
120 words
In a recording apparatus wherein scanning is conducted by means of a light beam which is modulated on the basis of image information, the improvement which comprises a semi-conductor laser, a circuit for driving said semi-conductor laser, a circuit for generating a timing signal for driving said laser before scanning a leading edge of a page, a circuit for detecting an optical output of said laser and generating a photoconverted signal, a circuit for comparing said photoconverted signal with a reference signal, a circuit for generating a constant signal for making said optical output constant on the basis of a signal from said comparing circuit, and a circuit for holding said constant signal during a recording period of said page.
Claim 6
Dependent Claim
37 words
In the apparatus of claim 3, the improvement which further comprises a circuit which generates a badge signal for writing a badge of reference density in an area before a leading edge according to said timing signal.
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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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |