초록 ▼

An optical disc device includes an optical pickup for irradiating optical discs with laser and detecting light reflected by the disc to generate received light signals, optical pickup driving means for driving the pickup radially, traverse signal generation means for generating traverse signals form

An optical disc device includes an optical pickup for irradiating optical discs with laser and detecting light reflected by the disc to generate received light signals, optical pickup driving means for driving the pickup radially, traverse signal generation means for generating traverse signals forming a pulse at the pickup's crossing a track by binarizing the received light signal based on binary threshold, movement control means for recognizing moving amount and speed of the pickup based on the traverse signal and controlling the optical pickup driving means based on the recognition result for the pickup's seeking to the target, and abnormality monitoring means for sending abnormality notices to the movement control means when pulse interval of the traverse signal exceeds the threshold, the movement control means, after temporarily stopping seek according to the abnormality notice, recognizes the temporary stop position for the optical pickup's seeking from the position to the target.

대표청구항 ▼

What is claimed is: 1. An optical disc device comprising: an optical pickup for irradiating an optical disc with laser beam and detecting reflected light formed by the laser beam reflected by the optical disc so as to generate a received light signal; optical pickup driving means for driving the op

What is claimed is: 1. An optical disc device comprising: an optical pickup for irradiating an optical disc with laser beam and detecting reflected light formed by the laser beam reflected by the optical disc so as to generate a received light signal; optical pickup driving means for driving the optical pickup in a radial direction of the optical disc; traverse signal generation means for generating a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing the received light signal based on a predetermined binary threshold; movement control means for recognizing moving amount and moving speed of the optical pickup based on the traverse signal and for controlling the optical pickup driving means based on the recognition result so as to make the optical pickup seek to a target address of a seek destination; and abnormality monitoring means for sending an abnormality notice to the movement control means when pulse interval of the traverse signal becomes longer than a predetermined pulse interval threshold, wherein the movement control means temporarily stops the optical pickup in accordance with the abnormality notice, after temporarily stopping the optical pickup in accordance with the abnormality notice, the movement control means estimates a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, changes a spindle rotational speed or read clock in accordance with the estimated temporary stop position, reads the present address of the estimated temporary stop position, and calculates a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination. 2. A control device for controlling an optical pickup provided in an optical disc device, comprising: traverse signal generation means for generating a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing a received light signal obtained from reflected light of a laser beam emitted to an optical disc based on a predetermined binary threshold; movement control means for recognizing moving amount and moving speed of the optical pickup based on the traverse signal and for making the optical pickup seek to a target address of a seek destination based on the recognition result; abnormality monitoring means for sending an abnormality notice to the movement control means when pulse interval of the traverse signal becomes longer than a predetermined pulse interval threshold, wherein the movement control means temporarily stops the optical pickup in accordance with the abnormality notice, after temporarily stopping the optical pickup in accordance with the abnormality notice, the movement control means estimates a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, changes a spindle rotational speed or read clock in accordance with the estimated temporary stop position, reads a present address of the estimated temporary stop position, and calculates a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination. 3. A method for controlling an optical pickup provided in an optical disc apparatus, comprising: generating, at the optical disc apparatus, a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing, with a binarizing device, a received light signal obtained from reflected light of a laser beam emitted to an optical disc based on a predetermined binary threshold; recognizing, with a processing unit at the optical disc apparatus, moving amount and moving speed of the optical pickup based on the traverse signal so as to make the optical pickup seek to a target address of a seek destination; performing abnormality monitoring, with the processing unit at the optical disc apparatus, by monitoring pulse interval of the traverse signal for sending an abnormality notice when the pulse interval becomes longer than a predetermined pulse interval threshold; temporarily stopping, with the processing unit at the optical disc apparatus, the optical pickup in accordance with the abnormality notice; performing movement control, with the processing unit at the optical disc apparatus, after temporarily stopping the optical pickup in accordance with the abnormality notice, by estimating a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, by changing a spindle rotational speed or read clock in accordance with the estimated temporary stop position, reading a present address of the estimated temporary stop position, and calculating a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination. 4. An optical disc device comprising: an optical pickup configured to irradiate an optical disc with laser beam and to detect reflected light formed by the laser beam reflected by the optical disc so as to generate a received light signal; an optical pickup driver configured to drive the optical pickup in a radial direction of the optical disc; a traverse signal generator configured to generate a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing the received light signal based on a predetermined binary threshold; a movement controller configured to recognize moving amount and moving speed of the optical pickup based on the traverse signal and to control the optical pickup driver based on the recognition result so as to make the optical pickup seek to a target address of a seek destination; and an abnormality monitor configured to send an abnormality notice to the movement controller when pulse interval of the traverse signal becomes longer than a predetermined pulse interval threshold, wherein the movement controller temporarily stops the optical pickup in accordance with the abnormality notice, the movement controller, after temporarily stopping the optical pickup in accordance with the abnormality notice, is configured to estimate a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, to change a spindle rotational speed or read clock in accordance with the estimated temporary stop position, to read a present address of the estimated temporary stop position, and to calculate a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination. 5. A control device for controlling an optical pickup provided in an optical disc device, comprising: a traverse signal generator configured to generate a traverse signal forming a pulse at the optical pickup's crossing a track provided on the optical disc by binarizing a received light signal obtained from reflected light of a laser beam emitted to an optical disc based on a predetermined binary threshold; a movement controller configured to recognize moving amount and moving speed of the optical pickup based on the traverse signal and to make the optical pickup seek to a target address of the seek destination based on the recognition result; an abnormality monitor configured to send an abnormality notice to the movement controller when pulse interval of the traverse signal becomes longer than a predetermined pulse interval threshold, wherein the movement controller temporarily stops the optical pickup in accordance with the abnormality notice, the movement controller, after temporarily stopping the optical pickup in accordance with the abnormality notice, is configured to estimate a present address of a temporary stop position of the optical pickup based on a pulse number count value of the traverse signal when the pulse interval of the traverse signal becomes longer than the pulse interval threshold, to change a spindle rotational speed or read clock in accordance with the estimated temporary stop position, to read a present address of the estimated temporary stop position, and to calculate a number of physical tracks for seeking to the target address of the seek destination based on the read present address and the target address of the seek destination.