Pioneer Electronic Corporation

Kazunori Matsuo

Yoshiya Nonaka

Kiyoshi Furukawa

Hiroyuki Abe

Takayuki Iijima

Kazuhiro Kiyoura

Shigetoshi Kato

An optical disk reproducing device has a spindle servo control in which when a focusing error or a tracking error occurs, the spindle control voltage immediately before the error occurred is detected and stored in a memory. During the spindle servo is being off, the spindle control voltage is retrieved from the memory and applied to the spindle motor. Because the spindle motor is rotating at a speed corresponding to the track now being traced during the spindle servo off period, the spindle servo can be established quickly.

Optical disk reproducing device provided with improved spindle motor

A recording medium reproducing device comprises: reading means using a pickup to read data from a recording medium, and outputting the data thus read; memory control means for controlling the output data of the reading means to store the data in a memory; reproducing means for reading data from the memory and converting the data into a reproducing signal; and a microcomputer for controlling the reproducing means. In the reproducing device, the microcomputer varies a threshold value set for the memory, according to the time of absence or the frequency of absence of the output data of the reading means. Thus, the reproducing device eliminates the difficulty that the user feels unpleasant because of the frequent pause of sound reproduction.

Recording medium reproducing device

Address search method for use in a disk player repeatedly performing a track jump operation for jumping over a plurality of recording tracks at one time. The present method changes to a jump state from a locking state in which a tracking servo system of the disk player is locked so that an information reading light spot of a pickup of the disk player follows a recording track. Subsequently, a present address obtained from read output of the pickup is compared with a target address and the tracking servo system is placed in the locking state. The preceding steps for comparing the addresses are repeated until the target address is exceeded by the present address.

Growing community of inventors

Kawagoe, Japan

Kazunori Matsuo