Record playback apparatus

Patent metadata

Field	Value
Publication number	US-9966099-B2
Application number	US-201715610787-A
Country	US
Kind code	B2
Filing date	Jun 1, 2017
Priority date	Dec 4, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A record playback apparatus of the present disclosure includes a plurality of optical pickups that records information on a recording medium or plays back information from the recording medium; a single transport mechanism that transports the plurality of optical pickups together; and a transport control circuit that drives the single transport mechanism so that, when the single transport mechanism is driven to transport the plurality of optical pickups to respective target positions on the recording medium, absolute value of a maximum value of transport errors of the plurality of optical pickups with respect to the respective target positions becomes substantially equal to absolute value of a minimum value of transport errors of the plurality of optical pickups with respect to the respective target positions.

First claim

What is claimed is:

1. A record playback apparatus comprising:
a plurality of optical pickups that records information on a recording medium or plays back information from the recording medium;
a single transport mechanism that transports the plurality of optical pickups together; and
a transport control circuit that drives the single transport mechanism so that, when the single transport mechanism is driven to transport the plurality of optical pickups to respective target positions on the recording medium, absolute value of a maximum value of transport errors of the plurality of optical pickups with respect to the respective target positions becomes substantially equal to absolute value of a minimum value of transport errors of the plurality of optical pickups with respect to the respective target positions.

2. The record playback apparatus according to claim 1 ,
wherein the transport control circuit drives the single transport mechanism so that the absolute value of the maximum value of the transport errors of the plurality of optical pickups becomes substantially equal to the absolute value of the minimum value of the transport errors of the plurality of optical pickups, and further, the transport control circuit drives the single transport mechanism so that, among the plurality of optical pickups, an absolute value of a transport error of a second optical pickup becomes smaller than an absolute value of a transport error of a first optical pickup, the first optical pickup being located closer to an inner circumferential side than the second optical pickup is, the second optical pickup being located closer to an outer circumference side than the first optical pickup is.

3. A record playback apparatus comprising:
a plurality of optical pickups that records information on a recording medium or plays back information from the recording medium;
a single transport mechanism that transports the plurality of optical pickups together; and
a transport control circuit that drives the single transport mechanism so that, when the single transport mechanism is driven to transport the plurality of optical pickups to target positions on the recording medium, respective tracking driving powers of the plurality of optical pickups are equalized.

4. A record playback apparatus comprising:
a plurality of optical pickups that records information on a recording medium or plays back information from the recording medium;
a single transport mechanism that transports the plurality of optical pickups together; and
a transport control circuit that drives the single transport mechanism so that, when the single transport mechanism is driven to transport the plurality of optical pickups to target positions on the recording medium, sums of respective tracking driving power and focusing driving power of the plurality of optical pickups are equalized.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Momoo Kazuo
• Takahashi Yuichi
• Akagi Noritaka

Classifications

• G11B7/13

  Optical detectors therefor · CPC title

• G11B7/09 Primary

  with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following · CPC title

• G11B7/08582

  Sled-type positioners · CPC title

• G11B7/14 Primary

  specially adapted to record on, or to reproduce from, more than one track simultaneously · CPC title