EP0880131A2
Expired / Lapsed
EP
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Apparatus and methods for recording and/or reproducing data on to and/or from optical disks and disk cartridges for such disks
Assignee: Sony Corp
•
Filing: 1998-05-15
•
Granted: —
•
Expires: 2018-05-15
Abstract
Abstract An optical disk apparatus for recording and/or reproducing user data on to and/or from an optical disk (12) includes an optical head (11) with a semiconductor laser (13) for irradiating a laser beam having a wavelength of approximately 680 nm or less to the optical disk (12) and having a lens (17) with a numerical aperture (NA) of approximately 0.7 or more and a working distance of approximately 560 mu m or less. By utilizing such apparatus, a relatively large amount of data may be recorded onto the optical disk (12). <IMAGE>
Inventors
- 👤 Hideo C/O Sony Corporation Owa
- 👤 Shoei c/o Sony Corporation Kobayashi
- 👤 Susumu c/o Sony Corporation Sensyu
- 👤 Shinji c/o Sony Corporation Katsuramoto
- 👤 Toshio c/o Sony Corporation Watanabe
- 👤 Hidenori c/o Sony Corporation Mori
- 👤 Masanobu C/O Sony Corporation Yamamoto
- 👤 Masaki c/o Sony Corporation Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 04:55
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B7/00; G11B7/007; G11B19/00; G11B19/20; G11B19/28; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B23/0332; G11B27/02; G11B27/031; G11B27/036; G11B27/102; G11B27/105; G11B27/24; G11B7/12; G11B7/122; G11B7/125; G11B7/127; G11B7/135; G11B7/1372; G11B7/1374; G11B7/139; G11B7/24; G11B7/2407; G11B7/24085; G11B2007/00709; G11B2007/00727; G11B2007/00754; G11B20/10527; G11B2020/10537; G11B2020/10592; G11B2020/1453; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/216; G11B2220/23; G11B2220/235; G11B2220/25; G11B2220/2525; G11B2220/2537; G11B2220/2545; G11B2220/2562; G11B27/034; G11B27/34; G11B27/36; G11B7/00718; G11B7/24073; G11B7/24079
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
63 words
An optical disk apparatus for recording and/or
reproducing user data onto and/or from an optical disk,
said apparatus having an optical head having a lens with a
numerical aperture (NA) of approximately 0.7 or more and a
working distance of approximately 560 (µm) or less for
irradiating a laser beam having a wavelength of
approximately 680 (nm) or less to said optical disk.
Claim 2
Dependent Claim
41 words
The optical disk apparatus according to claim 1,
wherein the user data is recorded onto said optical disk as
a number of pits or marks in which the shortest pit length
or shortest mark length is approximately 0.3 (µm) or less.
Claim 3
Dependent Claim
48 words
The optical disk apparatus according to claim 1,
further having means for modulating the user data in
accordance with a (1, 7) repeated minimum transition
run-length limited (RLL) code modulation technique and
wherein the modulated user data is recorded with a record
density of 0.23 (µm/bit) or less.
Claim 4
Dependent Claim
27 words
The optical disk apparatus according to claim 1,
wherein the user data is recorded onto the optical disk
with a track pitch of 0.6 (µm) or less.
Claim 5
Dependent Claim
52 words
The optical disk apparatus according to claim 1,
further having a buffer memory and wherein the user data is
successively inputted to said buffer memory and transmitted
therefrom with a data transmitting speed of approximately
10 Mbps or more in a manner so as to be intermittently
recorded onto the optical disk.
Claim 6
Dependent Claim
42 words
The optical disk apparatus according to claim 1, further
having a buffer memory for intermittently receiving the user data
reproduced from the optical disk at a data transmitting speed of
approximately 10 Mbps or more and for successively outputting the
same therefrom.
Claim 7
Dependent Claim
34 words
The optical disk apparatus according to claim 1, wherein
redundant data is added to the user data and recorded onto the
optical disk so as to provide a redundancy of approximately 23%
or less.
Claim 8
Dependent Claim
58 words
The optical disk apparatus according to claim 1, wherein
said optical disk includes a light transmitting layer having a
thickness value within a range of 10 through 177 (µm) with a
discrepancy of +/- Δt in which Δt is defined by Δt ≤ ± 5.26 (λ/NA 4 ) (µm) wherein NA is numerical aperture and λ is wavelength.
Claim 9
Dependent Claim
31 words
The optical disk apparatus according to claim 1, wherein
said optical disk is rotatably arranged in a cartridge and
wherein said cartridge has means for providing access to said
optical disk.
Claim 10
Dependent Claim
98 words
The optical disk apparatus according to claim 1,
wherein a number of grooves having a guide groove of the laser
beam vary on said optical disk in a spiral shape or in shapes of
concentric circles and wherein a varying period of the groove
varies successively in steps from an inner peripheral side to an
outer peripheral side of said optical disk, and further having
means for rotating said optical disk with a rotational speed
which is switched successively in steps in correspondence with
the varying period of the groove at a position of the irradiating
laser beam.
Claim 11
Dependent Claim
77 words
The optical disk apparatus according to claim 1,
wherein at least one a groove having a guide groove of the laser
beam is formed in a spiral shape or in shapes of concentric
circles on said optical disk to form a track, and wherein one
revolution of said optical disk is divided into a plurality of
sectors based on address information which is recorded in the
track, and wherein the user data is recorded in the sectors.
Claim 12
Dependent Claim
56 words
The optical disk apparatus according to claim 1,
wherein at least one a groove having a guide groove of the laser
beam is formed in a spiral shape or in shapes of concentric
circles on said optical disk, and wherein the user data is
recorded at the groove and a land area adjacent to the groove.
Claim 13
Dependent Claim
70 words
The optical disk apparatus according to claim 1,
further having a buffer memory and wherein the user data is
successively inputted to the buffer memory and intermittently
recorded to the optical disk by way of the buffer memory, and
wherein a speed of transmitting the user data for recording onto
the optical disk is greater than a speed at which the data is
supplied to and/or from the buffer memory.
Claim 14
Dependent Claim
59 words
The optical disk apparatus according to claim 1,
further having a buffer memory and wherein the user data
reproduced from the optical disk is intermittently inputted to
the buffer memory, and wherein a speed of transmitting the user
data during reproducing from the optical disk is greater a speed
at which the data is outputted from the buffer memory.
Claim 15
Dependent Claim
64 words
The optical disk apparatus according to claim 1,
wherein the user data is arranged in a number of predetermined
block units and an error correction code is added to each block
unit, and wherein the user data is recorded to or reproduced from
the optical disk in one or more block units in which a block unit
has 32 or more KB of data.
Claim 16
Dependent Claim
121 words
An optical disk apparatus for recording and/or
reproducing data, said apparatus comprising an optical pickup
device having a numerical aperture of 0.70 or more and a working
distance of 560 (µm) or less for irradiating a laser beam onto an
optical disk so as to record desired user data onto the optical
disk with a shortest pit or mark length of 0.3 (pm) or less, said
optical disk having a diameter of approxiamtely 120 (mm), an
information recording portion, and a light transmitting layer
through which the laser beam is transmitted to said information
recording face and having a thickness value within a range of 10
through 177 (µm), wherein the user data includes video signal
data and audio signal data.
Claim 17
Dependent Claim
21 words
The optical disk apparatus according to claim 16,
wherein the video signal data and the audio signal data have been
compressed.
Claim 18
Dependent Claim
27 words
The optical disk apparatus according to claim 16,
wherein the video signal data and the audio signal data are
subjected to data compression and time division multiplexing.
Claim 19
Dependent Claim
107 words
The optical disk apparatus according to claim 16,
further comprising a buffer memory and a data processing circuit
for compressing the video signal data and the audio signal data
to form the user data and for expanding the user data to form the
video signal data and the audio signal data, wherein the user
data is recorded to and reproduced from the optical disk
intermittently by way of the buffer memory, and wherein a speed
of transmitting the user data to or from the optical disk is
greater than a speed at which the user data is transmitted
between the buffer memory and the data processing circuit.
Claim 20
Dependent Claim
107 words
The optical disk apparatus according to claim 16,
further comprising a buffer memory and a data processing circuit
for compressing the video signal data and the audio signal data
to form the user data and for expanding the user data to form the
video signal data and the audio signal data, wherein the user
data is recorded to and reproduced from the optical disk
intermittently by way of the buffer memory, and wherein a speed
of transmitting the user data to or from the optical disk is
approximately twice the speed at which the user data is
transmitted between the buffer memory and the data processing
circuit.
Claim 21
Dependent Claim
88 words
The optical disk apparatus according to claim 20,
wherein the data processing circuit processes a plurality of
channels of the user data in correspondence with a plurality of
channels of the video signal data and the audio signal data,
wherein the plurality of channels of user data are concurrently
inputted and outputted between the buffer memory and the data
processing circuit, and wherein the plurality of channels of user
data are alternately inputted and outputted between the buffer
memory and the optical disk in predetermined data amount units.
Claim 22
Dependent Claim
63 words
The optical disk apparatus according to claim 21,
wherein the plurality of channels of video signal data and audio
signal data are concurrently supplied to the data processing
circuit and recorded to the optical disk, and wherein the
plurality of channels of video signal data and audio signal data
are reproduced from the optical disk and outputted concurrently
from the data processing circuit.
Claim 23
Dependent Claim
104 words
The optical disk apparatus according to claim 21,
wherein the buffer memory outputs user data for recording to the
optical disk and receives other user data from the optical disk
during reproduction in which the user data for recording is
continuously inputted from the data processing circuit and the
user data received during reproducing is continuously outputted
to the data processing circuit, and wherein the data processing
circuit compresses the video signal data and the audio signal
data to form the user data for recording and expands the user
data obtained during reproduction to form the video signal data
and the audio signal data.
Claim 24
Dependent Claim
60 words
The optical disk apparatus according to claim 23,
wherein the video signal data and the audio signal data for
recording are obtained by editing the video signal data and the
audio signal data for reproducing, and wherein the user data for
recording is recorded at a portion wherein the user data for
reproducing is reproduced after a predetermined time period.
Claim 25
Dependent Claim
185 words
An optical disk apparatus for recording and/or
reproducing data, said apparatus comprising: an optical pickup device for irradialing a laser beam
onto an optical disk having a diameter of approximately 120 (mm),
an information recording portion, and a light transmitting layer
through which the laser beam is transmitted to said information
recording face and having a thickness value within a range of 10
through 177 (µm); and means for rotating the optical disk such that a
rotational speed thereof is varied successively in steps in
accordance with a position of the laser beam; wherein the information recording face of the optical
disk is divided into a plurality of regions in shapes of
concentric circles and desired data is recorded such that record
densities at the respective regions are substantially equalized;
and wherein when data recorded on the optical disk is
reproduced by switching the regions of the desired data to the
regions of a predetermined recording object, the data recorded on
the optical disk is reproduced while maintaining the rotational
speed of the optical disk in correspondence with the regions of
the predetermined recording object.
Claim 26
Independent Claim
137 words
A method of recording and/or reproducing data to and/or
from an optical disk, said method comprising the steps of: varying successively a rotational speed of the optical
disk in steps in accordance with a position of a laser beam; dividing an information recording face of the optical
disk into a plurality of regions having shapes of concentric
circles; and recording data to the optical disk such that recording
densities at respective regions are substantially equal and
reproducing recorded data from the optical disk; wherein when data recorded on the optical disk is
reproduced by switching the regions of the desired data to the
regions of a predetermined recording object, the data recorded on
the optical disk is reproduced while maintaining the rotational
speed of the optical disk in correspondence with the regions of
the predetermined recording object.
Claim 27
Dependent Claim
23 words
The method according to claim 26, wherein the recording
and reproducing of the data to and from the optical disk are
alternately repeated.
Claim 28
Dependent Claim
143 words
An optical disk apparatus for recording and/or
reproducing data to and/or from an optical disk, said apparatus
comprising: means for varying successively a rotational speed of
the optical disk in steps in accordance with a position of a
laser beam; means for dividing an information recording face of the
optical disk into a plurality of regions having shapes of
concentric circles; and means for recording data to the optical disk such that
recording densities at respective regions are substantially equal
and for reproducing recorded data from the optical disk; wherein when data recorded on the optical disk is
reproduced by switching the regions of the desired data to the
regions of a predetermined recording object, the data recorded on
the optical disk is reproduced while maintaining the rotational
speed of the optical disk in correspondence with the regions of
the predetermined recording object.
Claim 29
Dependent Claim
25 words
The optical disk apparatus according to claim 28,
wherein the recording and reproducing of the data to and from the
optical disk is alternately repeated.
Claim 30
Dependent Claim
117 words
A disk cartridge for accommodating and retaining an
optical disk having data recorded thereon by use of an optical
head wherein said optical disk can be rotated in said disk
cartridge but cannot be easily removed therefrom, said disk
cartridge comprising: an opening extending in a radial direction of said
optical disk; and a shutter for closing and exposing said opening when
the shutter is respectively moved between first and second
positions; wherein said optical head has a lens with a numerical
aperture (NA) of approximately 0.7 or more and a working distance
of approximately 560 (µm) or less and irradiates a laser beam
having a wavelength of approximately 680 (nm) or less to said
optical disk.
Claim 31
Dependent Claim
24 words
A disk cartridge according to claim 30, wherein
the optical disk has a light transmitting layer with of thickness
between 3 and 177 µm.
References Cited (Backward Citations)
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