Recording and reproducing method, recording and reproducing device and semiconductor circuit
An optical disk information recording and reproducing device ( 100 ), which is used for recording and reproducing information on an optical disk ( 10 ), includes a system controller ( 19 ), a tracking control portion ( 15 ), a focus control portion ( 16 ) and an aberration correction portion ( 17 ). The system controller ( 19 ) adjusts a control parameter for recording and reproducing control of the optical disk ( 10 ) by using a tracking error signal TE that is detected from an region ( 30 ) having a wide track pitch on the optical disk ( 10 ). The tracking control portion ( 15 ), the focus control portion ( 16 ) and the aberration correction portion ( 17 ) record and reproduce information on the optical disk ( 10 ) by using the adjusted control parameter.
1 . A recording and reproducing method for recording and reproducing information on an optical disk, comprising:
(a) adjusting a control parameter for recording and reproducing control of the optical disk by using a detected signal that is detected from an region having a predetermined track pitch on the optical disk; and
(b) recording and reproducing information on the optical disk by using the adjusted control parameter.
2 . The recording and reproducing method according to claim 1 , wherein the detected signal is a tracking control signal that is used for tracking a light spot, which is for recording and reproducing information on the optical disk, in the region having the predetermined track pitch.
3 . The recording and reproducing method according to claim 1 , wherein the tracking control signal is a tracking error signal that is a differential output of a photo detector portion for detecting reflected light of the light spot, and step (a) includes adjusting the control parameter so that a signal amplitude of the tracking error signal becomes the maximum value.
4 . The recording and reproducing method according to claim 1 , wherein the recording and reproducing control includes a focus control for substantially stabilizing a light spot for recording and reproducing information on the optical disk and an aberration correction control for correcting an optical aberration of the light spot.
5 . The recording and reproducing method according to claim 4 , wherein the aberration correction control is a control for correcting a spherical aberration.
6 . The recording and reproducing method according to claim 4 , wherein step (a) includes finding optimal control positions for the focus control and the aberration correction control in the region having the predetermined track pitch.
7 . The recording and reproducing method according to claim 1 , wherein the region having the predetermined track pitch is an region that is formed so that information cannot be recorded on the optical disk.
8 . The recording and reproducing method according to claim 1 , wherein the region having the predetermined track pitch is a region that is formed at the inner part of the optical disk.
9 . The recording and reproducing method according to claim 1 , wherein the track pitch of the optical disk is formed so as to enable tracking control in which a light spot generated by one light source can trace the course of a desired track in every region.
10 . The recording and reproducing method according to claim 1 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is an region having a wide track pitch among the regions having different track pitches, and
step (b) includes recording and reproducing information on the optical disk in a region having a narrow track pitch among the regions having different track pitches.
11 . The recording and reproducing method according to claim 1 , wherein the region having the predetermined track pitch is an region having a track pitch which is twice or more the diameter of the light spot for recording and reproducing information on the optical disk.
12 . The recording and reproducing method according to claim 11 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is an region having a wide track pitch among the regions having different track pitches, and
a region having a narrow track pitch among the regions having different track pitches is a region having a track pitch which is twice or less the diameter of the light spot.
13 . The recording and reproducing method according to claim 1 , wherein a value of (TPW/λ)*NA is within the range of 3.69-4.95 when TPW represents the track pitch of the region having the predetermined track pitch, λ represents a wavelength of light that is irradiated onto the optical disk, and NA represents a numerical aperture of an objective lens for condensing light.
14 . The recording and reproducing method according to claim 13 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is a region having a wide track pitch among the regions having different track pitches, and
a value of (TPS/λ)*NA is within the range of 0.61-0.73 when TPS represents a track pitch of a region having a narrow track pitch among the regions having different track pitches.
15 . A recording and reproducing device for recording and reproducing information on an optical disk, comprising:
a parameter adjustment portion for adjusting a control parameter for recording and reproducing control of the optical disk by using a detected signal that is detected from a region having a predetermined track pitch on the optical disk; and
a recording and reproducing execution portion for recording and reproducing information on the optical disk by using the adjusted control parameter.
16 . The recording and reproducing device according to claim 15 , wherein the detected signal is a tracking control signal that is used for tracking a light spot, which is for recording and reproducing information on the optical disk, in the region having the predetermined track pitch.
17 . The recording and reproducing device according to claim 15 , wherein the tracking control signal is a tracking error signal that is a differential output of a light reception portion for receiving reflected light of the light spot, and the parameter adjustment portion adjusts the control parameter so that a signal amplitude of the tracking error signal becomes the maximum value.
18 . The recording and reproducing device according to claim 15 , wherein the recording and reproducing control includes a focus control for substantially stabilizing a light spot for recording and reproducing information on the optical disk and an aberration correction control for correcting an optical aberration of the light spot.
19 . The recording and reproducing device according to claim 18 , wherein the aberration correction control is a control for correcting a spherical aberration.
20 . The recording and reproducing device according to claim 18 , wherein the parameter adjustment portion finds optimal control positions for the focus control and the aberration correction control in the region having the predetermined track pitch.
21 . The recording and reproducing device according to claim 15 , wherein the region having the predetermined track pitch is a region that is formed so that information cannot be recorded on the optical disk.
22 . The recording and reproducing device according to claim 15 , wherein the region having the predetermined track pitch is a region that is formed at the inner part of the optical disk.
23 . The recording and reproducing device according to claim 15 , wherein the track pitch of the optical disk is formed so as to enable tracking control in which a light spot generated by one light source can trace the course of a desired track in every region.
24 . The recording and reproducing device according to claim 15 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is a region having a wide track pitch among the regions having different track pitches, and
the recording and reproducing execution portion records and reproduces information on the optical disk in a region having a narrow track pitch among the regions having different track pitches.
25 . The recording and reproducing device according to claim 15 , wherein the region having the predetermined track pitch is a region having a track pitch which is twice or more the diameter of the light spot for recording and reproducing information on the optical disk.
26 . The recording and reproducing device according to claim 25 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is a region having a wide track pitch among the regions having different track pitches, and
a region having a narrow track pitch among the regions having different track pitches is a region having a track pitch which is twice or less the diameter of the light spot.
27 . The recording and reproducing device according to claim 15 , wherein a value of (TPW/λ)*NA is within the range of 3.69-4.95 when TPW represents the track pitch of the region having the predetermined track pitch, λ represents a wavelength of light that is irradiated onto the optical disk, and NA represents a numerical aperture of an objective lens for condensing light.
28 . The recording and reproducing device according to claim 27 , wherein the optical disk includes grooves having different track pitches in each region of the optical disk,
the region having the predetermined track pitch is a region having a wide track pitch among the regions having different track pitches, and
a value of (TPS/λ)*NA is within the range of 0.61-0.73 when TPS represents a track pitch of a region having a narrow track pitch among the regions having different track pitches.
29 . A semiconductor circuit for adjusting a control parameter for recording and reproducing control of the optical disk, comprising:
a detected signal obtaining portion for obtaining a detected signal that is detected from an region having a predetermined track pitch on the optical disk; and
a parameter adjustment portion for adjusting a control parameter of the recording and reproducing control by using the obtained detected signal.
30 . The recording and reproducing method according to claim 2 , wherein the tracking control signal is a tracking error signal that is a differential output of a photo detector portion for detecting reflected light of the light spot, and step (a) includes adjusting the control parameter so that a signal amplitude of the tracking error signal becomes the maximum value.
31 . The recording and reproducing method according to claim 5 , wherein step (a) includes finding optimal control positions for the focus control and the aberration correction control in the region having the predetermined track pitch.
32 . The recording and reproducing device according to claim 16 , wherein the tracking control signal is a tracking error signal that is a differential output of a light reception portion for receiving reflected light of the light spot, and the parameter adjustment portion adjusts the control parameter so that a signal amplitude of the tracking error signal becomes the maximum value.
33 . The recording and reproducing device according to claim 19 , wherein the parameter adjustment portion finds optimal control positions for the focus control and the aberration correction control in the region having the predetermined track pitch.