US5099468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information processing apparatus having offset adjusting circuit which can be exchanged together with optical head
Assignee: Canon Inc
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Filing: 1991-06-11
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Granted: 1992-03-24
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Expires: 2011-06-11
Abstract
Abstract An optical information processing apparatus is so constructed that an optical head in the apparatus for recording and/or reproducing information by irradiating a light beam onto a recording medium is exchangeably attached to an apparatus main body, wherein a circuit which compensate for an offset of an electric signal which is output from the optical head, is attached to the apparatus main body so that it can be exchanged together with the optical head, thereby making unnecessary an offset adjustment after the optical head has been exchanged.
Inventors
- 👤 Yasuo Suzuki
- 👤 Shigeru Aoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:13
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10532; G11B11/10534; G11B11/10536; G11B7/00; G11B7/08; G11B7/09; G11B7/0901; G11B7/0908; G11B7/0909; G11B7/094; G11B7/10; G11B7/12
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
186 words
An optical information processing apparatus comprising: a base; an optical head detachably attached to said base, said optical head comprising: (a) a light source for emitting a light beam; (b) an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; (c) focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; and (d) a detector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said detector; and a signal processing circuit attached to said base, said signal processing circuit comprising at least one control circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising means for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said detector and received through said adjusting circuit.
Claim 2
Dependent Claim
186 words
An optical information processing apparatus comprising: a base; an optical head detachably attached to said base, said optical head comprising: (a) a light source for emitting a light beam; (b) an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; (c) focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; and (d) a detector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said detector; and a signal processing circuit attached to said base, said signal processing circuit comprising at least one control circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising means for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said detector and received through said adjusting circuit.
Claim 3
Dependent Claim
27 words
An apparatus according to claim 1, wherein said optical head and said adjusting circuit are detachably attached and are capable of being integrally attached to said base.
Claim 4
Dependent Claim
14 words
An apparatus according to claim 1, wherein said adjusting circuit comprises a variable resistor.
Claim 5
Dependent Claim
28 words
An apparatus according to claim 1, wherein the output signal produced by said detector comprises at least one of a tracking error signal and a focusing error signal.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 1, wherein the output signal produced by said detector comprises a reproduction signal of the information recorded on the information recording medium.
Claim 7
Dependent Claim
56 words
An apparatus according to claim 1, wherein said optical head further comprises a head position sensor for detecting a position of said optical head and for producing an output signal, and said apparatus further comprises a circuit, detachably attached to said base, for adjusting a variation in the output signal produced by said head position sensor.
Claim 8
Dependent Claim
169 words
An optical head unit for use in an optical information processing apparatus, said optical head unit comprising: a light source for emitting a light beam; an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; a photodetector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit for adjusting an offset of the output signal produced by said photodetector; and a connector terminal for electrically connecting a signal processing circuit mounted on a main body of said optical information processing apparatus, said signal processing circuit comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
Claim 9
Dependent Claim
169 words
An optical head unit for use in an optical information processing apparatus, said optical head unit comprising: a light source for emitting a light beam; an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; a photodetector for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit for adjusting an offset of the output signal produced by said photodetector; and a connector terminal for electrically connecting a signal processing circuit mounted on a main body of said optical information processing apparatus, said signal processing circuit comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
Claim 10
Dependent Claim
16 words
An optical head unit according to claim 7, wherein said adjusting circuit comprises a variable resistor.
Claim 11
Dependent Claim
30 words
An optical head unit according to claim 7, wherein the output signal produced by said photodetector comprises at least one of a tracking error signal and a focusing error signal.
Claim 12
Dependent Claim
29 words
An optical head unit according to claim 7, wherein the output signal produced by said photodetector comprises a reproduction signal of the information recorded on the information recording medium.
Claim 13
Dependent Claim
45 words
An optical head unit according to claim 7, further comprising a position sensor for detecting position of said optical head unit and for producing an output signal, and a second adjusting circuit for adjusting a variation of the output signal produced by said position sensor.
Claim 14
Dependent Claim
97 words
An optical information processing apparatus in which an optical head, for recording information on and/or reproducing information from a recording medium by applying a light beam to the recording medium, is detachably attached to a main body of the apparatus, characterized in that an adjusting circuit, for adjusting an offset of an electrical signal output from said optical head, is detachably attached to the main body of the apparatus together with said optical head so that said optical head is capable of being replaced free of offset adjustment of the electrical signal output from said optical head.
Claim 15
Dependent Claim
97 words
An optical information processing apparatus in which an optical head, for recording information on and/or reproducing information from a recording medium by applying a light beam to the recording medium, is detachably attached to a main body of the apparatus, characterized in that an adjusting circuit, for adjusting an offset of an electrical signal output from said optical head, is detachably attached to the main body of the apparatus together with said optical head so that said optical head is capable of being replaced free of offset adjustment of the electrical signal output from said optical head.
Claim 16
Dependent Claim
20 words
An apparatus according to claim 12, wherein said adjusting circuit is capable of being replaced together with said optical head.
Claim 17
Dependent Claim
14 words
An apparatus according to claim 12, wherein said adjusting circuit comprises a variable resistor.
Claim 18
Dependent Claim
29 words
An apparatus according to claim 12, wherein the electrical signal output from said optical head comprises at least one of a tracking error signal and a focusing error signal.
Claim 19
Dependent Claim
27 words
An apparatus according to claim 12, wherein the electrical signal output from said optical head comprises a reproduction signal of the information recorded on the recording medium.
Claim 20
Dependent Claim
175 words
An optical information processing apparatus, comprising: a base; a light source detachably attached to said base, for emitting a light beam; an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; a photodetector detachably attached to said base, for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said photodetector; and a signal processing circuit attached to said base, said signal processing circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
Claim 21
Dependent Claim
175 words
An optical information processing apparatus, comprising: a base; a light source detachably attached to said base, for emitting a light beam; an optical system for directing a light beam from said light source to an information recording medium, and for irradiating the information recording medium with a condensed light beam; focusing and/or tracking adjusting means for adjusting a focusing and/or tracking condition of the condensed light beam irradiating the information recording medium; a photodetector detachably attached to said base, for detecting light reflected from the information recording medium when irradiated with the condensed light beam, and for producing an output signal; an adjusting circuit, detachably attached to said base, for adjusting an offset of the output signal produced by said photodetector; and a signal processing circuit attached to said base, said signal processing circuit capable of being electrically connected to said adjusting circuit through a connector, and comprising a control circuit for controlling said focusing and/or tracking adjusting means in accordance with the output signal produced by said photodetector and received through said adjusting circuit.
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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) | 1995-03-24 | 1995-09-23 | 1996-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-24 | 1999-09-23 | 2000-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-24 | 2003-09-23 | 2004-03-24 | $7700.00 | Window Closed / Lapsed |