US4972210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driver for a diode laser
Assignee: Eastman Kodak Co
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Filing: 1989-06-28
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Granted: 1990-11-20
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Expires: 2009-06-28
Abstract
Abstract A driver is disclosed for a diode laser for use in a laser printer. The driver current is controlled in accordance with a digital video signal. In order to provide an effective means of converting the video signal to the desired driver current, the digital signal is provided to a plurlality of current-weighted subdrivers. In order to overcome the effects of optical feedback in an apparatus, signals to the subdrivers are composite signals formed from a high frequency carrier and the video signal.
Inventors
- 👤 Nea Y. Woo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:14
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/12; G06K15/1204
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A driver for a diode laser for use in an apparatus which produces optical feedback, said driver being adapted to receive a digital video signal and to produce an output which is proportional to the magnitude of said signal, said driver comprising: means for generating a composite signal which is comprised of said digital video signal and an RF signal; and means for receiving said composite signal and for producing a current in said diode laser which proportional to the magnitude of said composite signal, said receiving and producing means including a plurality of subdrivers, and each of said subdrivers being adapted to receive said RF signal and one bit of said digital video signal.
Claim 2
Dependent Claim
115 words
A driver for a diode laser for use in an apparatus which produces optical feedback, said driver being adapted to receive a digital video signal and to produce an output which is proportional to the magnitude of said signal, said driver comprising: means for generating a composite signal which is comprised of said digital video signal and an RF signal; and means for receiving said composite signal and for producing a current in said diode laser which proportional to the magnitude of said composite signal, said receiving and producing means including a plurality of subdrivers, and each of said subdrivers being adapted to receive said RF signal and one bit of said digital video signal.
Claim 3
Dependent Claim
20 words
A driver, as defined in claim 1, wherein each of said subdrivers includes an ECL gate and a current-weighted resistor.
Claim 4
Dependent Claim
22 words
A driver, as defined in claim 2, wherein each of said ECL gates is connected to a cathode of said diode laser.
Claim 5
Dependent Claim
16 words
A driver, as defined in claim 1, wherein said RF signal is greater than 300 MHz.
Claim 6
Dependent Claim
92 words
A driver for a diode laser comprising: a current source for connection to said diode laser; a plurality of subdrivers connected to said diode laser, each of said subdrivers including a gate and a resistor of a predetermined value; and signal means connected to each of said gates for triggering each gate to effect a current flow through the gate and its respective resistor, said signal means being adapted to receive a RF signal and a digital signal and to provide a signal to a gate when said digital signal is high.
Claim 7
Dependent Claim
92 words
A driver for a diode laser comprising: a current source for connection to said diode laser; a plurality of subdrivers connected to said diode laser, each of said subdrivers including a gate and a resistor of a predetermined value; and signal means connected to each of said gates for triggering each gate to effect a current flow through the gate and its respective resistor, said signal means being adapted to receive a RF signal and a digital signal and to provide a signal to a gate when said digital signal is high.
Claim 8
Dependent Claim
13 words
A driver, as defined in claim 5, wherein said gates are ECL gates.
Claim 9
Dependent Claim
15 words
A driver, as defined in claim 5, wherein said signal means is an AND gate.
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) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |