JPS63148474A - Optical disk device - Google Patents

Abstract

PURPOSE:To prevent unbalance due to weight from arising on a slider and to improve access performance of the slider by disposing optical pickups to be of point symmetry against the center of gravity of the slider. CONSTITUTION:The center of gravity 9 of the slider 3 is the center point of the slider 3. A pair of optical pickup 2 have their respective condenser lenses 7 and focusing actuator 6. Then, the two optical pickups 2 are fixed up on the slider 3 to be of point symmetry with each other against the center of gravity 9. That is, the optical pickups 2 are positioned with their respective edges 2A and 2B extending to the corners of the slider 3, while the focusing actuators 6 and condenser lenses 7 are disposed to face each other, thus ensuring the balance of the weight on the slider 3. Therefore, imbalance due to weight does not occur to the slider 3 and hence the movement characteristics of the slider 3 is never deteriorated. In this way, no resonance takes place with the slider 3 due to the unbalance, so that the access performance can therefore be improve.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical disk device and a magneto-optical disk device (hereinafter simply referred to as an optical disk device) in which a plurality of optical pickups are fixed on a slider.

(Prior art) Generally, when recording and playing back moving images, the data transfer rate is high, so four tracks are required, and accordingly four tracks are fixed on one slider for two disks. It was accessed using two optical pickups.

2. Description of the Related Art Conventional optical disc devices of this type include those shown in FIGS. 2 and 3, for example.

In FIG. 2, reference numeral 1 denotes a disc serving as a disc-shaped recording medium, and for example, a writable and readable optical disc is used. This optical disk 1 is detachably inserted into a spindle motor (not shown), and is rotated and driven by the spindle motor. A pair of optical pickups 2 are fixed on a slider 3, and each of these optical pickups 2 has a condenser lens 7 and a focusing actuator 6. The focusing actuator 6 has an autofocus control function and controls the light beam from the condenser lens 7 to form a predetermined spot on the recording surface of the optical disc 1. In this way, the two optical pickups 2 write information on the optical disc 1 or read information from the disc 1. Coils 4 are attached to both sides of the slider 3.
is formed on the yoke 5 so that it can move within the groove. That is, the yoke 5 and the magnet 5A constitute a magnetic circuit, and this magnetic circuit applies a magnetic field to the coil 4. Therefore, when current is applied to the coil 4, the slider 3 moves in the radial direction relative to the optical disk 1 due to the generated electromagnetic force. Note that 8 is a support member that supports the slider 3.

Next, FIG. 3 is a view of the top of the slider 3 viewed from the optical disk 1 side, and shows the positional relationship between the two optical pickups 2. As shown in FIG.

As shown in FIG. 3, two optical pickups 2 are arranged in parallel and fixed on a slider 3 so as to face in the same direction.

(Problem to be solved by this invention) However,
In such a conventional optical disk device, two optical pickups are arranged on the slider so as to face the same direction, so an unbalance due to IIJt occurs in the slider, and when the slider moves in this state, the unbalance occurs. There is a problem in that access performance deteriorates because mechanical resonance occurs in the slider due to balance.

In particular, when the data transfer rate is high, the preamplifier for detecting playback signals, autofocus servo, and servo signal detection for autotrack servo must be placed near the optical pickup, that is, on the slider. In such a case, the weight applied to the slider further increases, and the problems caused by the imbalance become even more noticeable.

(Means for Solving the Problems) The present invention was made in view of the above problems, and the present invention is designed to make the optical pickup point symmetrical on the slider so as not to cause unbalance due to weight. The objective is to provide an optical disc device with a

In order to achieve this object, the present invention provides a disc-shaped recording medium that is rotationally driven by a motor, and a plurality of disc-shaped recording media that converge a light beam on the recording medium and read information from or write information on the recording medium. In an optical disk device, the plurality of optical pickups are mounted on the slider with respect to its center of gravity. They are arranged symmetrically.

(Function) In the present invention having such a configuration, since the plurality of optical pickups are arranged on the slider so as to be point symmetrical with respect to the center of gravity of the slider, there is no imbalance due to the weight of the slider. The dynamic characteristics of the slider will not deteriorate.

Therefore, the slider is free from mechanical damage due to unbalance during movement, making it possible to improve access performance.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing a main part of an embodiment of the present invention, and is a view of the top of the slider viewed from the optical disk side. In addition, the same reference numerals are given to the same components as in the conventional art and the explanation will be given.

In FIG. 1, 3 indicates a slider movable in the radial direction with respect to the optical disc 1, and 9 indicates the center of gravity of the slider 3. Note that the center of gravity 9 is usually the center point of the slider 3. Reference numeral 2 denotes a pair of optical pickups, each of which has a condenser lens 7 and a focusing actuator 6.

Here, the two optical pickups 2 are fixed on the slider 3 at positions symmetrical to each other with respect to the center of gravity 9. That is, each end 2A, 2B of the optical pickup 2 extends toward the corner of the slider 3, and the focusing actuator 6 and the condensing lens 7 are arranged to face each other. This arrangement ensures a balanced weight on the slider 3.

Therefore, in this embodiment, no unbalance due to weight occurs in the slider 3, so that the dynamic characteristics of the slider 3 do not deteriorate. As a result, resonance due to unbalance does not occur in the slider 3, making it possible to improve access performance.

In this embodiment, the optical disc 1 is used as the disc-shaped recording medium, but it goes without saying that the same effect can be obtained by using a magneto-optical disc instead.

(Effects of the Invention) As described above, according to the present invention, since the optical pickup is arranged point-symmetrically with respect to the center of gravity of the slider, it is possible to prevent unbalance due to weight occurring on the slider. The dynamic characteristics of the slider are not deteriorated.As a result, when the slider is moved, it is possible to suppress the occurrence of mechanical co-photography due to unbalance, and the access performance of the slider can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main part of an embodiment of the present invention, FIG. 2 is a perspective view showing a conventional example, and FIG. 3 is a diagram showing the main part. 1: Optical disk 2: Optical pickup 2A, 28: End portion 3 Varnish slider 4: Coil 5: Yoke 5A: Magnet 6: Focusing actuator 7: Condensing lens 8: Support member

Claims (1)

[Claims] A disc-shaped recording medium that is rotationally driven by a motor, a plurality of optical pickups that focus a light beam on the recording medium, read information from the recording medium, or write information to the recording medium, and these optical pickups are fixed. and a slider that moves in the radial direction with respect to the recording medium, characterized in that the plurality of optical pickups are arranged on the slider in point symmetry with respect to its center of gravity. optical disk device.