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Patent US5268914A successfully refreshed from Google Patents.
US5268914A
Expired / Lapsed
US
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Laser beam control apparatus
Assignee: Toshiba Corp
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Filing: 1992-06-03
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Granted: 1993-12-07
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Expires: 2012-06-03
Abstract
Abstract The laser beam control apparatus according to the invention having a photodiode for outputting a current consisting of high and low-frequency components in accordance with the amount of a laser beam emitted from a laser diode. The current output from the photodiode is separated into high and low-frequency components by a CR filter, and the separated low-frequency current is amplified by an amplifier. The current amplified by this amplifier is added to the high-frequency current separated by the CR filter. The resulting sum current is converted into a voltage by an amplifier, and the amount of the laser beam emitted from the laser diode is controlled in accordance with the voltage converted by this amplifier. With this operation, the laser beam output power of the laser diode can be stably controlled in a wide band.
Inventors
- 👤 Mikio Yamamuro
- 👤 Yutaka Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/06832
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A laser beam control apparatus comprising: first generating means for generating a laser beam; second generating means for generating a current corresponding to an amount of the laser beam generated by said first generating means said generated current having a high-frequency component and a low-frequency component; means for separating the current, detected by said second generating means, into the high-frequency component and the low-frequency component; means for amplifying the low-frequency current separated by said separating means; means for adding the current, amplified by said amplifying means, to the high-frequency current separated by said separating means; means for converting the sum current obtained by said adding means into a voltage; and means for stabilizing the intensity of the laser beam emitted from said first generating means, in accordance with the voltage output by said converting means.
Claim 2
Dependent Claim
135 words
A laser beam control apparatus comprising: first generating means for generating a laser beam; second generating means for generating a current corresponding to an amount of the laser beam generated by said first generating means said generated current having a high-frequency component and a low-frequency component; means for separating the current, detected by said second generating means, into the high-frequency component and the low-frequency component; means for amplifying the low-frequency current separated by said separating means; means for adding the current, amplified by said amplifying means, to the high-frequency current separated by said separating means; means for converting the sum current obtained by said adding means into a voltage; and means for stabilizing the intensity of the laser beam emitted from said first generating means, in accordance with the voltage output by said converting means.
Claim 3
Dependent Claim
30 words
An apparatus according to claim 1, wherein at least some of said separating means, said amplifying means, said adding means, said converting means, and said stabilizing means are highly integrated.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1, wherein said separating means comprises a CR filter consisting of a capacitor and a resistor.
Claim 5
Dependent Claim
53 words
An apparatus according to claim 1, wherein said stabilizing means comprises a low-pass filter for cutting off unnecessary high-frequency components from the voltage output by said converting means, and a driver for causing said first generating means to generate a laser beam in accordance with a voltage value supplied from said low-pass filter.
Claim 6
Dependent Claim
13 words
An apparatus according to claim 1, wherein said detecting means comprises a photodiode.
Claim 7
Dependent Claim
16 words
An apparatus according to claim 1, wherein said first generating means comprises a semiconductor laser oscillator.
References Cited (Backward Citations)
US4899348A
Cited
US5151910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |