US 7,072,253 B2 · Optical disc reproduction apparatus and automatic adjustment method for same

Abstract

An optical disc reproduction apparatus is provided for permitting appropriate automatic adjustment to a servo control system, particularly a CD and a DVD-ROM having a BCA. A limit switch 24 is disposed in such a manner that it detects movement of an optical pickup 11 to a position which is located at a radius of 23.49 mm from the center. A system controller 22 moves the optical pickup 11 by 1.0 mm in an outer radial direction from the position detected by the limit switch 24, and reads a signal from an optical disc 5 at that position to carry out the automatic adjustment to the servo system, through a servo controller 21 and a feed motor 18. As a result, in the CD, a signal within a lead-in area thereof is used for and subjected to the automatic adjustment performed by the servo controller 21, while in the DVD-ROM, a signal in an outer peripheral area of a lead-in area having the BCA and in the vicinity thereof is used for and subjected to the adjustment.

Claims17

Dependent claims

An optical disc reproduction apparatus for rotating an optical disc and reading a signal recorded in said optical disc by an optical pickup to reproduce data, while carrying out servo control including at least one of focus servo control and tracking servo control, the apparatus comprising:

an automatic adjustment section for adjusting a characteristic of said servo control before the reproduction of the data, said automatic adjustment section including an optical pickup arrangement controller for moving said optical pickup to an automatic adjustment position of interest which is located away from a rotation center of the optical disc by a predetermined distance in the radial direction, and an adjustment section for adjusting the characteristic of the servo control in accordance with the signal read from the optical disc by the optical pickup at said automatic adjustment position of interest,
wherein said predetermined distance is more than 23.55 mm, and wherein said optical disc is one of a Digital Video Disc Read Only Memory (DVD-ROM) and a Digital Video Disc Rewritable (DVD-RW).

An automatic adjustment method for adjusting a characteristic of servo control before reproduction of data in an optical disc reproduction apparatus, said optical disc reproduction apparatus being operable to rotate an optical disc and read a signal recorded in said optical disc by an optical pickup so as to reproduce data, while carrying out the servo control including at least one of focus servo control and tracking servo control, said method comprising:

moving said optical pickup to a predetermined automatic adjustment position of interest;
and
adjusting the characteristic of the servo control in accordance with the signal read from the optical disc by the optical pickup at said automatic adjustment position of interest,
wherein said optical disc is one of a Digital Video Disc Read Only Memory (DVD-ROM) and a Digital Video Disc Rewritable (DVD-RW), and
wherein said automatic adjustment position of interest is a position which permits reading of a signal beyond an outer peripheral area of a Burst Cutting Area (BCA) formed in the DVD-ROM or beyond an outer peripheral area of a Narrow Burst Cutting Area (NBCA) formed in the DVD-RW.

2 more elements

moving said optical pickup in a radial direction of the optical disc to cause a limit switch for detection of movement of said optical pickup to a predetermined detection position to detect the movement of the optical pickup to said detection position;
moving said optical pickup to an automatic adjustment position away from a rotation center of the optical disc by a predetermined distance in the radial direction, based on the position where the optical pickup is located when said limit switch detects the movement of the optical pickup;
and
adjusting the characteristic of the servo control in accordance with the signal read from the optical disc by the optical pickup at said automatic adjustment position,
wherein said predetermined distance is more than 23.55 mm, and
wherein said optical disc is one of a Digital Video Disc Read Only Memory (DVD-ROM) and a Digital Video Disc Rewritable (DVD-RW).

3 more elements

Dependencies are inferred from the claim text.

Optical disc reproduction apparatus and automatic adjustment method for same

Life of this patent

Optical disc reproduction apparatus and automatic adjustment method for same

Life of this patent

Abstract

Claims17