Optical disc and recording and reproducing apparatus employing the optical disc

Claim 2

A recording medium (1, 21) having a recording track (3, 23) whose width is changed in a burst-like fashion to represent control data of a predetermined number of bits.

Claim 3

A recording medium (21) comprising a recordable surface (26) and having a recording track (23) thereon whose center­line (1₀) is periodically displaced across the track width with respect to an imaginary centerline 1₁ of the recording track (23) and whose track width varies along its length in a burst-like fashion, wherein period data are pre-recorded by the deviation of the track centerline 11 across the track width and control data of a predetermined number of bits are represented by the burst-like changes of the track width.

Claim 4

A recording medium (21) comprising a recordable surface (26) and having a recording track (23) thereon whose center­line (1₀) is periodically displaced across the track width with respect to an imaginary centerline 1₁ of the recording track (23) and whose track width varies along its length in a burst-like fashion, wherein period data are pre-recorded by the deviation of the track centerline 11 across the track width and control data of a predetermined number of bits are represented by the burst-like changes of the track width.

Claim 5

The recording medium (1, 21) according to claim 1 or 2, wherein the control data are the address data for each data block as one unit.

Claim 6

The recording medium (1, 21) according to claim 3, wherein the regions (4, 24) containing widthwise changes of the track (3, 23) and thus including the address data represent data record regions or data non-record regions depending on the recording mode.

Claim 7

The recording medium according to claim 4, wherein the recording modes are a mode in which the recorded data are subjected to convolution encoding and a mode in which the recorded data are subjected to sector complete type encoding.

Claim 8

A recording apparatus for use with a recording medium of the type which includes a recording track whose width changes in a burst-like fashion to represent control data of a predetermined number of bits, comprising: detecting means (10; 32, 33) for detecting the control data signals recorded on the recording track (3, 23), the detecting means including two pairs (AD, BC) of detectors, each pair being arranged across the track width and producing a separate push-pull output, and control means (50) for controlling the data recording operation on the recording track (3, 23) based on the control data.

Claim 9

A recording apparatus for use with a recording medium of the type which includes a recording track whose width changes in a burst-like fashion to represent control data of a predetermined number of bits, comprising: detecting means (10; 32, 33) for detecting the control data signals recorded on the recording track (3, 23), the detecting means including two pairs (AD, BC) of detectors, each pair being arranged across the track width and producing a separate push-pull output, and control means (50) for controlling the data recording operation on the recording track (3, 23) based on the control data.

Claim 10

The recording apparatus according to claim 6, wherein the control data are address data and wherein the control means (50) controls the recording on the recording track based on the reproduced address signals.

Claim 11

The recording apparatus according to claim 7, wherein the regions containing widthwise changes of the track and thus including the address data represent data record regions or data non-record regions depending on the recording mode.

Claim 12

The recording apparatus according to claim 8, wherein the record modes include a mode in which the data to be recorded are subjected to convolution encoding and a mode in which the data to be recorded are subjected to sector completed encoding.

Claim 13

A recording apparatus for use with a record medium (21) of the type having a recording track (23) the centerline 1₀ of which is periodically displaced across the track width with respect to an imaginary centerline (1₁) of the recording track (23) to represent period data and which has a track width which changes in a burst-like fashion to represent control data, comprising detecting means (32, 33) for detecting the period data and control data of a predetermined number of bits recorded on the recording track (23), the detecting means (32, 33) including at least two pairs of detectors, each pair being arranged across the track width and producing a separate push-pull output, and control means (50) for controlling the recording operation on the recording track (23) based on the period and control data as represented by the push-pull outputs.

Claim 14

A recording apparatus for use with a record medium (21) of the type having a recording track (23) the centerline 1₀ of which is periodically displaced across the track width with respect to an imaginary centerline (1₁) of the recording track (23) to represent period data and which has a track width which changes in a burst-like fashion to represent control data, comprising detecting means (32, 33) for detecting the period data and control data of a predetermined number of bits recorded on the recording track (23), the detecting means (32, 33) including at least two pairs of detectors, each pair being arranged across the track width and producing a separate push-pull output, and control means (50) for controlling the recording operation on the recording track (23) based on the period and control data as represented by the push-pull outputs.

Claim 15

A recording apparatus as recited in claim 10 wherein the detecting means (32, 33) detects the control data signals as the summation (36, 40) output of each of the detectors.

Claim 16

A reproducing apparatus for use with a recording medium (1, 21) of the type which includes a recording track whose width changes in a burst-like fashion to represent control data of a predetermined number of bits, comprising: detecting means (10; 32, 33) for detecting the control data signals recorded on the recording track (3, 23), the detecting means (10; 32, 33) including two pairs of detectors, each pair being arranged across the track width and producing a separate push-pull output, the detecting means detecting the control data signals as the summation (11; 36, 40) output of each of the detectors, and control means (50) for controlling the data reproducing operation on the recording track (3, 23) based on the control data.

Claim 17

A reproducing apparatus for use with a recording medium (1, 21) of the type which includes a recording track whose width changes in a burst-like fashion to represent control data of a predetermined number of bits, comprising: detecting means (10; 32, 33) for detecting the control data signals recorded on the recording track (3, 23), the detecting means (10; 32, 33) including two pairs of detectors, each pair being arranged across the track width and producing a separate push-pull output, the detecting means detecting the control data signals as the summation (11; 36, 40) output of each of the detectors, and control means (50) for controlling the data reproducing operation on the recording track (3, 23) based on the control data.