JPS6183116U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing an example of the circuit system that is the main part of the tracking error detection device for an optical disc player according to the present invention, Fig. 2 is a waveform diagram showing the states of signals obtained in each part, and Fig. 3 The figure is a waveform diagram for explaining when there is a defect on the signal recording surface of the disk, Figure 4 is a diagram showing an example of the optical system when tracking errors are detected by the three-spot method, and Figure 5 is a diagram showing an example of the optical system when tracking errors are detected by the three-spot method. FIG. 6 is a diagram showing the positional relationship of three light beams on a disk. FIG. 6 is a connection diagram showing an example of a conventional circuit system for detecting tracking errors by the three-spot method. In the figure, M is a light beam for signal reading, E and F are first and second light beams for tracking error detection, 11E and 11F are first and second light receiving elements, and 21E and 21F are first and second light beams. and a second detection circuit, 25 is a subtraction circuit.

Claims (1)

[Scope of utility model registration request] On a disk on which a signal is recorded so that it can be reproduced by irradiating the track with a light beam, a disc symmetrical with respect to the direction along the track and the direction perpendicular thereto, with the light beam for reading the signal as the center. first and second light-receiving elements for respectively detecting first and second light beams for tracking error detection that are incident on the disk and reflected by the disk;
and first and second detection circuits that detect the peak-to-peak values of the output signals of the second light-receiving element, respectively, and an arithmetic circuit that obtains a signal of the difference between the output signals of the first and second detection circuits. A tracking error detection device for an optical disc player, wherein the output signal of the arithmetic circuit is used as a tracking error detection signal.