JPH0249224A - Rewritable optical disc device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rewritable optical disc device using a cartridge-type optical disc having an opening for recording and reproducing information.

[Prior Art] Conventionally, in a rewritable optical disk device using a cartridge-type optical disk having an opening for recording and reproducing information, data is erased during the first rotation of the optical disk and recorded during the second rotation. The disk had to be rotated twice to record new data.

[Problems to be Solved by the Invention] However, in the conventional technology, the optical disc must be rotated at least twice before data can be rewritten on a cartridge-type optical disc that has a gateway for recording and reproducing data. The problem is that it takes time to rewrite data, and the data transfer speed is slow.

Therefore, the present invention is intended to solve these problems, and its purpose is to enable pseudo override even for cartridge-type optical discs that have openings for recording and playback, and to increase the data transfer speed. The purpose of the present invention is to provide means for configuring an optical disc device.

[Means for Solving the Problems] In order to solve the above problems, a rewritable optical disk device of the present invention has a plurality of optical heads, and a focused beam emitted from the optical heads is directed onto the optical disk. The plurality of optical heads are arranged so as to be movable in the radial direction of the optical disc, and the distance between the beam spots in the circumferential direction of the disc is less than or equal to the width of the entrance part, and the tracking can be controlled independently. Features.

[Function] According to the above configuration of the present invention, in an optical disc device using a cartridge-type optical disc having an opening for recording/reproducing information, the interval in the circumferential direction of the laser beam spot can be made equal to or less than the width of the opening. As a result, an optical disk device capable of pseudo override can be realized.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. FIG. 1 is a schematic plan view of the periphery of an optical head of an optical disc device as viewed from the optical disc side, according to an embodiment of the present invention. Lens focusing actuators 1 and 2 are linear motors 3 and 4
1, 3, 2, and 4 are integrated and perform rough access operations independently.Fixed optical system sections 7 and 8, including galvano mirrors 5 and 6 for track control, a laser, and a light receiving section, are connected to the optical disk. Fixed to the main body of the device.

12 and 13 show the trajectory of the laser beam spot on the optical disk. 'The diameter of the optical disk used in this practical example is 5.25 inches, and the area used for recording data has a radius of 3 cm to 6 cm. The size of the recording/reproducing opening is 6 f, 2 mm in the radial direction of the disk, and 40 mm in the tangential direction of the disk. The heads were arranged so that the beam rllff distance was 36 mm on the outer circumferential side of the disk, and 18 mm on the inner side.

There was no interference due to the proximity of the two focusing units, and there was no effect on head operation at all.

FIG. 2 shows an example of a conventional optical disc device, in which information is recorded, erased, and reproduced using a set of optical head systems.

Table 1 shows the measurement of the time taken to rewrite an area where old data is recorded with new data while rotating the disc at several different disc rotational speeds using the optical disc apparatus of the present invention. For comparison, a case using the conventional example shown in FIG. 2 is also described.

As shown in Table 1, data rewriting time was shortened by using the configuration of the present invention. As a result, the apparent data transfer rate has improved.

[Effects of the Invention] As explained above, the optical disc device of the present invention enables pseudo-overwriting even in a rewritable optical disc device that uses a cartridge type optical disc having openings for recording, erasing, and reproducing information. This has the effect of increasing the recording/reproducing speed of data, significantly increasing the processing speed of information, and expanding the field of application to fields that require high data transfer speeds, such as optical disk devices and computer memories. It also has the effect of being able to respond in real time to continuous data such as image information.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration around an optical head of an embodiment of the rewritable optical disc device of the present invention. FIG. 2 is a diagram showing an example of a conventional example. l. 2. 14 ・ 3, 4, l 5 5, 6, 16 7, 8, l 7 9, l 8 10.19 11, 20 12, Focusing actuator linear motor/galvano mirror ・Fixed optical system ° Disk cartridge ・ Recording/playback Above the frontage laser beam trajectory Applicant Seiko Epson Co., Ltd. Representative Patent Attorney Masayoshi Kamiyanagi (1 other person)

Claims (1)

[Claims] A rewritable optical disc device using a cartridge-type optical disc having an opening for recording and reproducing information, comprising a plurality of optical heads, and a condensed beam emitted from the optical heads. The plurality of optical heads are arranged so as to be movable in the radial direction of the optical disc, and the plurality of optical heads are arranged so that an interval in the circumferential direction of the optical disc of the beam spot on the optical disc is equal to or less than the width of the opening, and tracking is controlled independently of each other. A rewritable optical disc device characterized in that: