JPH03171433A - Optical disk device - Google Patents

Abstract

PURPOSE:To read and write information on both surfaces of a recording medium while the recording medium is loaded by switching and transmitting the projection light of a fixed optical head as one light source to one of two movable optical heads. CONSTITUTION:An upper movable optical head 10 is fixed to the free end tip part of an upper arm 11b and a lower movable optical head 9 is fitted to the free end tip part of a lower arm 11c. Then the movable optical heads 9 and 10 are arranged on the top surface side and reverse surface side of the recording medium 4 and a rotary mirror 6 is driven to rotate to + or -45 deg. tilt angle, and consequently the projection light of the fixed optical head 5 as one light source is switched and transmitted to one of the two movable optical heads 9 and 10. Consequently, information is written on both surfaces while the recording medium is loaded without being replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical disc device, and more particularly to an optical disc device that can access both sides of a recording medium.

(Prior Art) As is well known, in an optical disk device, a carriage to which an optical head is attached is moved and urged by a voice coil motor, and the carriage is attached to a rotating shaft of a spindle motor to move and urge a carriage to a predetermined position on the recording surface of a rotating recording medium. This is a device that positions an optical head at the front and writes and reads information optically.

Here, in conventional optical disk devices, the spindle motor is fixed, but if the recording medium is supported horizontally on the rotating shaft, the optical head is usually placed below the bottom surface of the recording medium, and the optical head is usually placed below the bottom surface of the recording medium, and the record player can be used to load and unload records. The recording medium is attached and detached using the same procedure.

(Problems to be Solved by the Invention) As described above, conventional optical disc devices are designed to access only one side of the recording medium, so when attempting to read or write information on the opposite side, There is a problem in that the recording medium must be taken out once, turned upside down, and then reinstalled, which is very inconvenient.

The present invention has been made in view of such conventional problems, and its purpose is to provide an optical disc device that can read and write information on both sides of the recording medium while it is attached, without requiring replacement of the recording medium. There is a particular thing. (Means for Solving the Problems) In order to achieve the above object, an optical disc device of the present invention has the following configuration.

That is, the optical disk device of the present invention includes a mounting portion to which a voice coil motor is attached, and a recording medium having one end fixedly held in the mounting portion and the other free end attached to the rotating shaft of the spindle motor. a carriage having a pair of arms extending along the front and back surfaces of the carriage at positions separated by an appropriate distance; one fixed optical head serving as a light source; and a fixed optical head that directs the emitted light from the fixed optical head to the front and rear surfaces of the recording medium. a rotating mirror that reflects light in one direction on the back side; a front side fixed mirror and a back side fixed mirror that make the reflected light of the rotating mirror parallel to the front and back surfaces of the recording medium; each attached to the pair of arms; , a front-side movable optical head and a back-side movable optical head that receive reflected light from corresponding mirrors of the front-side fixed mirror and the back-side fixed mirror and irradiate the corresponding recording medium surface; That is.

(Function) Next, the function of the optical disc device of the present invention constructed as described above will be explained.

In the present invention, a movable optical head is arranged on each of the front side and the back side of a recording medium, and the light emitted from the fixed optical head, which is one light source, is switched and transmitted to one of the two movable optical heads. It's like this.

As a result, it is possible to provide an optical disc that allows information to be read and written on both sides of the disc while the disc is mounted without requiring replacement of the recording medium. Here, the recording medium may be fixed. Furthermore, when the recording medium is made removable, the distance between the recording medium and the movable optical head is small, so for example, the spindle motor may be made movable in the direction of the rotation axis. (Example) Examples of the present invention will be described below with reference to the attached drawings. FIG. 1 shows an optical disc device according to an embodiment of the present invention. In FIG. 1, the voice coil motor is composed of a voice coil 12 and a permanent magnet I3.

The permanent magnet 13 is a fixed body, and the voice coil 12 is urged to move linearly (move horizontally in the illustrated example) by the permanent magnet 13.

The carriage l1 has a mounting part 11a and a pair of arms (llb
, 11c). The protruding end of the voice coil l2 is fixed to the right side of the mounting part 11a, and the protruding end of the voice coil l2 is fixed to the left side of the mounting part 11a.
A pair of arms (1lb, I1c) are fixed at their respective ends at appropriate distances apart in the vertical direction in FIG. 1(b), and are supported in a cantilevered elliptical structure. That is, a pair of arms (Ifb.
IIc) The recording medium 4 is inserted almost horizontally between the two arms (flb, Ilc) in the illustrated example, but the other free ends of the pair of arms (flb, Ilc) are connected to the front and back surfaces of the recording medium 4 (in the illustrated example, the upper and lower surfaces > One end of the recording medium 4 is attached to the mounting portion 1 so as to maintain a position at an appropriate distance away from the recording medium 4 and extend an appropriate distance along the upper and lower surfaces of the recording medium 4.
It is fixedly held at 1a.

The upper movable part optical head IO is attached to the free end tip of the upper arm llb, and the lower movable part optical head 9 is attached to the free end tip of the lower arm 11c. These include a diaphragm lens, a tracking galvano mirror, a focus actuator, and the like.

The recording medium 4 is detachably attached to the rotating shaft of the spindle motor 1 and rotated in a substantially horizontal plane.

That is, the apparatus of this embodiment is of a type in which the recording medium 4 can be replaced. As shown in FIG. 1(b), a spring 2 is provided on the lower surface of the spindle motor 1, and the spindle motor 1 is always urged upward.

On the other hand, a wind-up motor 3 is mounted on the bottom surface of the spindle motor 1.
A tongue piece is attached, and when the winding motor 3 winds up the tongue piece, the spindle motor 1 moves downward while crushing the spring 2, so that the recording medium 4 can be attached and detached. In this way, when the spindle motor 1 is moved downward by the wind-up motor 3, the recording medium 4 is inserted and set in a fixed position, and the biasing force of the wind-up motor 3 is released, the spindle motor 1 is pushed up by the spring 2. The recording medium holder 4 is fitted onto the rotating shaft and driven to rotate. Then, the carriage I1 is urged to move by the voice coil motor, and the upper movable optical head 1O and the lower movable optical head 9 are positioned with respect to the recording medium 4.

Next, the fixed optical head 5 includes a laser diode as a light source, a focus sensor, a track sensor, and the like. A laser beam emitted by a laser diode in this fixed optical head is incident on a rotating mirror 6. The rotating mirror 6 is rotated to a predetermined inclination angle by a small servo motor (not shown), and reflects and transmits the incident laser beam to either the upper fixed mirror 8 or the lower fixed mirror 7. In the illustrated example, the rotating mirror 6, lower fixed mirror 7, and upper fixed mirror 8 are arranged in a line in the vertical direction.
When the mirror inclination of rotating mirror 6 is +45°, the incident laser beam is reflected toward the upper fixed mirror 8, and when the mirror inclination is −45°, the incident laser beam is reflected toward the lower fixed mirror 7. The upper fixed mirror 8 has a mirror inclination angle of +45 degrees, reflects the incident light parallel to the upper surface of the recording medium 4, and transmits it to the upper movable optical part and to the tracking galvanometer mirror of the throat 10. Further, the lower fixed mirror 7 has a mirror inclination angle of −45°, reflects the incident light parallel to the lower surface of the recording medium 4, and transmits it to the tracking galvanometer mirror of the lower movable optical head 9.

Now, when the rotating mirror 6 is driven to rotate so that its mirror inclination angle is −45°, the laser beam emitted by the fixed optical head 5 passes through the rotating mirror 6 and the lower fixed mirror 7 to the tracking of the lower movable optical head 9. The light is transmitted to a galvanometer mirror, where it is reflected upward at a right angle, and illuminates a predetermined position on the lower surface of the recording medium 4 through a diaphragm lens. Recording medium 4
The reflected light passes through the lower fixed mirror 7 in the opposite direction to the previous path.
It returns to the fixed optical head 5 via the rotating mirror 6. Focus servo is performed by the focus sensor of the fixed part optical head 5 and the focus actuator of the lower movable part optical head 9, and tracking is performed by the track sensor of the fixed part optical head 5 and the tracking galvano mirror of the lower movable part optical head 9. Servo is performed, and reading and writing on the bottom surface of the recording medium 4 is executed.

Next, when the rotary mirror 6 is rotated 90 degrees and the mirror inclination angle is +45 degrees, reading and writing on the upper surface of the recording medium 4 can be performed in the same manner.

Note that the movable optical head (9.10) can be configured to have the minimum necessary number of parts and most of the structural parts can be provided in the fixed optical head 5, so the movable optical head (9.
10) can be achieved without reducing weight. Furthermore, since there is only one light source, the configuration can be simplified.

(Effects of the Invention) As explained above, according to the optical disc device of the present invention, movable optical heads are arranged on the front side and the back side of the recording medium, and the fixed optical head, which is one light source, emits light. Since the light is transmitted by switching to one of the two movable optical heads, it is possible to provide an optical disc device that can read and write information on both sides of the recording medium without having to replace it. There is. Furthermore, since there is only one light source, there is an effect that the configuration can be simplified.

Furthermore, since it is no longer necessary to replace the recording medium, there is an advantage that an optical disk device with a fixed recording medium can be provided.

[Brief explanation of the drawing]

Fig. 1 shows the structure of an optical disk device according to an embodiment of the present invention, Fig. 1 (a> is a schematic top view, and Fig. 1 (b) is a schematic side view and a system configuration diagram. 1. ...Spindle motor, 2...Spring, 3...Hoisting motor, 4...
Recording medium, 5...Fixed optical head, 6...
...Rotating mirror 7...Lower inquiry mirror, 8.
...Upper fixed mirror 9...Lower movable optical head, IO...Uemachi moving optical head, l1
...Carriage, lla...Mounting section, llb...Upper arm, llc...
・Lower arm, 12...Voice coil, 13・
·····permanent magnet.

Claims (1)

[Claims] The mounting part to which the voice coil motor is attached, and the front and back surfaces of the recording medium, one end of which is fixedly held by this mounting part and the other free end of which is attached to the rotating shaft of the spindle motor, are located at an appropriate distance from the front and back surfaces of the recording medium. 1 to be extended along
a carriage having a pair of arms; one fixed optical head serving as a light source; a rotating mirror that reflects the emitted light from the fixed optical head in one direction on either the front or back side of the recording medium; the rotating mirror a front-side fixed mirror and a back-side fixed mirror that collimate reflected light with the front and back surfaces of the recording medium; An optical disc device comprising: a front side movable optical head and a back side movable optical head that receive reflected light and irradiate a corresponding recording medium surface.