Pioneer Electronic Corporation

Akihiko Tagawa

Koichi Ishitoya

Toshimasa Hangai

An apparatus for monitoring a reading position for use in a disc player includes a positional information generating device for generating positional information of an information reading point in a direction of disc radius in accordance with the movement of the information reading point. The apparatus is configured to perform operations of detecting a condition that the information reading point is in one of at least lead-in and lead-out areas on the disc, storing each positional information by the positional information generating device at the time of the detection, comparing the positional information by the positional information generating device during the movement of the information reading point, and monitoring the position of the information reading point with respect to the lead-in and lead-out areas on the basis of a result of the comparison.

Apparatus for monitoring a reading position for use in a disc player

A multispeed reproducing control apparatus of a video disk player for playing CLV disks causes a portion of the information carrying tracks to be scanned and then a track jump operation is performed, this process being repeated to reproduce the recorded video at a selected n times the standard reproducing rate. To maintain proper image display at the n-times reproducing speed the track jump interval and the number of tracks jump each track jump command are controlled in accordance with the radial position of the pickup head.

Multispeed reproducing control apparatus of a video disk player for

A slider-position detector for a disk player having a slider carrying a pickup and capable of moving in radial direction of a disk. The slider-position detector comprises an up-down counter which indicates a count variable according to the direction and moved distance of the slider, and controller which provides the count counted by the up-down counter as position data. The controller sets the up-down counter to a predetermined value when the counting rate of the up-down counter lowers below a predetermined rate while the slider moves in the predetermined direction. The slider-position detector is capable of surely detecting the position of the slider.

Slider-position detector for detecting the position of the slider of a

A slider-position detector for a disk player having a slider whose friction coefficient is low on a guide rail and for carrying a pickup and capable of moving in radial direction of a disk, which detector comprises a locking mechanism for locking the slider in accordance with a locking signal, and controller for providing a locking signal to the locking mechanism while the disk player is in a stop mode. The controller further detects the movement of the slider and causes the locking to lock the slider only upon the detection of movement of the slider while the disk player is in the stop mode. While reducing unwanted operating noises, the slider-position detector is capable of surely detecting the position of the slider easily moved due to external vibrations.

A slider control device in a disk player wherein normal speed information in each operation; mode of the slider, holding a pickup, is stored in a memory beforehand and the moving speed of the slider in each operation mode is detected and compared with the normal speed. The driving source of the slider is controlled according to the result of comparison. With this arrangement, even when the slider is driven at a high speed using, for example, a linear motor as a driving source for the slider, it is possible to execute secure speed control.

Growing community of inventors

Tokorozawa, Japan

Akihiko Tagawa