US5808993A
Expired / Lapsed
US
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Automatic disk discriminating method and apparatus in an optical disk system
Assignee: Samsung Electronics Co Ltd
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Filing: 1997-01-29
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Granted: 1998-09-15
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Expires: 2017-01-29
Abstract
Abstract An automatic disk discriminating method and an apparatus therefor are disclosed for use in an optical disk system. A triangular wave signal generator generates a triangular wave signal for searching for a focus point by moving a objective lens in relation to the optical disk. A window signal generator generates a window signal by comparing the triangular wave signal with a predetermined level. A disk discriminator discriminates the disk type of the optical disk by comparing the signal obtained when light from the objective lens is focused on a recording surface on the optical disk, with the window signal. Accordingly, the disk type of the optical disk is automatically discriminated during focus controlling using the distance between the disk recording surface and the objective lens of the optical pick-up.
Inventors
- 👤 Sung-jin Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:24
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G11B19/12; G11B5/00; G11B5/74; G11B5/82; G11B7/00; G11B7/08; G11B7/09; G11B7/0945; G11B2007/0003; G11B2007/0006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
An automatic disk discriminating method in an optical disk system which can compatibly reproduce optical disks of different thickness by focus controlling between an objective lens and a recording surface of an optical disk, said method comprising the steps of: generating a triangular wave signal for searching for a focus point by moving the objective lens in relation to the optical disk according to the triangular wave signal; generating a window signal by comparing the triangular wave signal with a predetermined level; and discriminating a disk type of the optical disk by comparing a signal obtained when light from the objective lens is focused on the recording surface of the optical disk with said window signal.
Claim 2
Dependent Claim
116 words
An automatic disk discriminating method in an optical disk system which can compatibly reproduce optical disks of different thickness by focus controlling between an objective lens and a recording surface of an optical disk, said method comprising the steps of: generating a triangular wave signal for searching for a focus point by moving the objective lens in relation to the optical disk according to the triangular wave signal; generating a window signal by comparing the triangular wave signal with a predetermined level; and discriminating a disk type of the optical disk by comparing a signal obtained when light from the objective lens is focused on the recording surface of the optical disk with said window signal.
Claim 3
Dependent Claim
36 words
The automatic disk discriminating method recited as claimed in claim 1, wherein the signal obtained when light from the objective lens is focused on the recording surface of the optical disk is a focus error signal.
Claim 4
Dependent Claim
27 words
The automatic disk discriminating method recited as claimed in claim 1, wherein said disk types discriminated are a compact disk (CD) and a digital video disk (DVD).
Claim 5
Dependent Claim
124 words
An automatic disk discriminating apparatus in an optical disk system which can compatibly reproduce optical disks of different thickness by focus controlling between an objective lens and a recording surface of an optical disk, the apparatus comprising: a triangular wave signal generator for generating a triangular wave signal for searching for a focus point by moving said objective lens in relation to the optical disk according to the triangular wave signal; a window signal generator for generating a window signal by comparing said triangular wave signal with a first predetermined level; and disk discriminating means for discriminating disk types by comparing a signal obtained when light from the objective lens is focused on the recording surface of the optical disk with said window signal.
Claim 6
Dependent Claim
124 words
An automatic disk discriminating apparatus in an optical disk system which can compatibly reproduce optical disks of different thickness by focus controlling between an objective lens and a recording surface of an optical disk, the apparatus comprising: a triangular wave signal generator for generating a triangular wave signal for searching for a focus point by moving said objective lens in relation to the optical disk according to the triangular wave signal; a window signal generator for generating a window signal by comparing said triangular wave signal with a first predetermined level; and disk discriminating means for discriminating disk types by comparing a signal obtained when light from the objective lens is focused on the recording surface of the optical disk with said window signal.
Claim 7
Dependent Claim
40 words
An automatic disk discriminating apparatus in an optical disk system as claimed in claim 4 wherein said disk discriminating means outputs a signal indicating said optical disk is one of a compact disk (CD) and a digital video disk (DVD).
Claim 8
Dependent Claim
171 words
An automatic disk discriminating apparatus in an optical disk system as claimed in claim 4, said disk discriminating means comprising: a comparator for determining whether the light from said objective lens is focused on the recording surface of the optical disk by using said triangular wave signal and outputting a comparison signal; an AND gate for performing an AND operation on the comparison signal and said window signal and outputting a clocking signal; a NAND gate for performing a NAND operation on a focus control state signal and a play key input signal and outputting a set signal; and a D flip-flop for receiving the set signal output by said NAND gate through a reverse set terminal, the clocking signal output by said AND gate through a clock terminal, a first logic level through a data input terminal, and a second logic level through a reverse reset terminal, and for outputting a discriminating signal indicating a disk type of the optical disk based on the set signal and the clocking signal.
Claim 9
Dependent Claim
54 words
An automatic disk discriminating apparatus in an optical disk system as claimed in claim 6, wherein said AND gate outputs a logical HIGH signal if said optical disk is a compact disk (CD) at the same time the comparison signal indicates said objective lens is focussed on the recording surface of said optical disk.
Claim 10
Dependent Claim
40 words
An automatic disk discriminating apparatus in an optical disk system as claimed in claim 6, wherein said disk discriminating means outputs a signal indicating said optical disk is one of a compact disk (CD) and a digital video disk (DVD).
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