JPS59210570A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the number of detectors and to make the detector simple in structure that does not require a reversing mechanism by providing a detector that performs recording and reproducing of upper recording area of a discoid recording medium and a detector that performs recording and reproducing of lower side recording area separately and allotting respective parts. CONSTITUTION:Disks 1 are piled and fixed to a rotation shaft 2 and rotate in a body. An upper optical head 3 performs recording and reproducing for upper recording area of the disk 1, and a lower optical head 4 performs recording and reproducing for lower recording area of the disk 1. The upper head 3 and lower head 4 are attached respectively to exclusive positioners 7 and 8 through arms 5 and 6, and can be moved independently. Positioners 7, 8 can move in vertical direction and horizontal direction in the figure and select one of piled disks 1 by the movement in vertical direction, and select one track from recording tracks on the disk 1 by the horizontal movement.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an information recording/reproducing device, and particularly to an information recording/reproducing device that accommodates a plurality of disc-shaped recording media inside the device and records or reproduces information at high speed. The present invention relates to an information recording and reproducing device suitable for.

An information recording/reproducing device that accommodates a plurality of disc-shaped recording media therein includes a plurality of disc-shaped recording media stacked and fixed on one rotating shaft, such as a sealed magnetic disk device, for example. However, there are some that have a simple mechanism for rotational movement. In this case, each recording medium is provided with a dedicated detection device for recording and reproducing information on the disk-shaped recording medium. However, when the recording medium is bound or the detection device is expensive, such as an optical disk, the price of the entire information recording and reproducing device becomes very expensive when the number of recording media ranges from several tens to several hundreds. There was a problem with the price being high.

Therefore, in order to realize the information recording and reproducing apparatus at a low cost, it is necessary to keep the number of detection devices to the minimum necessary. One method for this purpose is to make the detection device a movable structure,
It is easily conceivable that the information recording and reproducing apparatus is configured such that each of the detecting apparatuses records and reproduces data on and from a plurality of disc-shaped recording media.

However, since the disc-shaped recording media are stacked and rotated on the same rotation axis, the upper recording area and the lower recording area of the disc-shaped recording medium are oriented in opposite directions. Therefore, in order to record and reproduce information signals in the upper recording area and the lower recording area using the same detection device, in addition to moving the detection device to each medium, it is necessary to change the direction of the detection device. It was necessary to make a 180-degree turn, which made the mechanism of the detection device even more complicated.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide an information recording/reproducing apparatus which requires a minimum number of detection devices and has a simple structure.

[Summary of the invention]

In order to achieve the above object, the present invention includes a detection device for recording and reproducing information on the upper recording area of a disc-shaped recording medium, and a detection device for recording and reproducing information on the lower recording area of the disc-shaped recording medium. By establishing them separately and having them share their roles.

The number of detection devices is small and the detection device has a simple configuration that does not require a reversing mechanism.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

The figure shows an example of the present invention applied to an optical video disc. Reference numeral 1 denotes a disk, which is stacked and fixed on a rotating shaft 2 and rotates as a unit. 3 and 4 are both optical heads, the upper head 6 performs recording and reproduction on the upper recording area of the disc 1, and the lower head 4 performs recording and reproduction on the lower recording area of the disc 1. Let's do it. The upper head 6 and the lower head 4 are attached to dedicated positioners 7 and 8 via arms 5 and 6, respectively, and can each move independently. Positioners 7 and 8 are movable vertically and horizontally in the figure, and by moving vertically they select one of the stacked disks 1, and by moving horizontally they select one of the recording tracks on disk 1. Select a book. According to the configuration of this embodiment, since the recording area on the disk 1 handled by the upper head 6 and the lower head 4 is limited to one direction, a mechanism for rotating the heads is unnecessary and the configuration is It will be easy. Further, since the upper head 3 and the lower head 4 can move independently, for example, while the upper head 3 is recording or reproducing information, the lower head 4 is used to determine the next place to record or reproduce information. By configuring the recording and playback software to search, it is possible to shorten the search time. This is especially effective when finding desired information while reproducing information.

The above example shows the case where one head is used for each of the upper and lower sides, but if the number of disks is very large, multiple heads for the upper and lower sides may be installed as shown in the figure. It is also possible to shorten the search time by allocating a disk for recording and reproduction to each head. It goes without saying that when the number of disks is large, the present invention can be implemented not only in the case of one rotating shaft as shown in the figure, but also in a configuration in which the disks are distributed over several rotating shafts.

Also, for the sake of explanation, the explanation was given only when the disc-shaped recording medium is an optical disc, but if it is a disc-shaped recording medium with recording areas on both sides, it is limited to the optical disc. The present invention is also applicable to capacitive, magnetic, and mechanical recording media.

〔Effect of the invention〕

As explained above, according to the present invention, a rotation mechanism for changing the direction of the detection device is not required, so that the device can be simplified. Furthermore, since the number of detection devices can be kept to the minimum necessary limit, it is possible to suppress an increase in the price of the entire information recording and reproducing apparatus due to an increase in the number of detection devices.

[Brief explanation of drawings]

The figure is a front view showing one embodiment of the present invention. 1... Disc 2... Rotating shaft 6... Upper head 4... Lower head 5, 6... Arm
7, 8...Posisimina 9...Motor's Patent Attorney Akio Takashi 292 Yoshida-cho, Totsuka-ku, Yokohama City

Claims (1)

[Claims] 1 A multilayer recording medium device in which a plurality of disk-shaped recording media with recording areas on the upper and lower sides (a) are stacked on the same axis and rotated, and information 4g recorded or recorded on the recording medium. The information recording and reproducing apparatus is equipped with at least two of the above-mentioned detecting devices, and each of the detecting devices (each detecting device has an upper recording area and a lower recording area of the disc-shaped recording medium). 1. An information recording and reproducing device characterized in that it is configured to exclusively perform recording or reproducing operations for either one of the member recording areas.