JPH05303843A - Optical head moving device - Google Patents

Abstract

PURPOSE:To reduce the space and the access time by making the optical head installed on an arm face each recording surface of a recording medium employing a rotating mechanism. CONSTITUTION:An optical head 10, which faces the recording surface of a recording medium 12, is driven by a motor 62 so as to rotate an arm 26 around a base section 30, move it from the outer peripheral side to the inner peripheral side along a recording surface 16 and a recording information is read. Then, drive the motor 62 to retract the arm 26 and the optical head 10 from the recording surface 16, rotate a ball screw 36 through gears 44 and 42 so as to move up a ball screw 34 with the arm 26. And, rotate the arm 26 by the motion of the motor 62, rotate the optical head 10 by 180 degrees by driving a motor 28 so as to face a recording surface 14 of a recording medium 12. Moreover, in a reversing procedure, the optical head 10 is moved from the recording surface 14 to the recording surface 16. By this method, the space is reduced and the operations of the arm and the optical head are speeded up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical head transfer device for obtaining an information signal of a disk-shaped recording medium.

[0002]

2. Description of the Related Art Conventionally, a reproducing mechanism for a double-sided disc such as a video disc is constructed as shown in FIG. That is, a U-shaped rail 2 having a fixed shape is arranged so as to sandwich the double-sided disk 1, and the rail 2
Is provided with an optical pickup 3. The optical pickup 3 is movable in a U-shape along the inside of the rail 2 in the arrow direction. Therefore, when the optical pickup 3 is at the position P1, the information signal on the upper surface 4 of the double-sided disc 1 is read. When the optical pickup 3 is at the position P2, it faces the side surface 5. Further, when the optical pickup 3 is at the position P3, the information signal on the lower surface 6 of the double-sided disc 1 is read.

[0003]

However, since the reproducing mechanism having such a structure has a complicated structure and the rail 2 has a U-shape with a fixed shape, the two rounded portions V1, V
There is a problem that the optical pickup 3 cannot be guided unless the radius of 2 is increased and the rail 2 cannot be increased in size. Therefore, since the rail 2 is large, the optical pickup 3
Has a drawback that the optical pickup 3 is slow to access from the upper surface 4 to the lower surface 6 or from the lower surface 6 to the upper surface 4 of the double-sided disc 1.

The present invention has been made to solve the above problems, and has a simple structure, can be miniaturized, and enables quick access to one recording surface and the other recording surface of a double-sided disc. It is an object of the present invention to provide a transfer device for an optical head capable of performing the above.

[0005]

According to the present invention, there is provided an optical head for irradiating a recording surface of a disk-shaped recording medium with a laser beam to receive reflected light from the recording surface, and an optical head. An optical head transfer device for moving an optical head along a recording surface, the arm supporting the head, and moving the arm in the axial direction of the disk-shaped recording medium so that the arm faces the recording surface. And a rotation means for rotating the optical head with respect to the arm so that the optical head faces the recording surface of the disk-shaped recording medium.

Preferably, the optical head attached to the arm is configured to rotate along the direction around the central axis of the arm.

Further, the optical head is rotatably attached at the tip of the arm around a rotation axis orthogonal to the extending direction of the arm.

[0008]

For convenience of understanding, the description will be given with reference to the reference numerals of the corresponding configurations of the embodiments. The moving means of the arm 26 moves the arm (26) so as to face the recording surface (14 or 16) of the disk-shaped recording medium (12). Then, the direction of the optical head (10) itself attached to this arm can be changed so as to face the surface (14 or 16) of the disk-shaped recording medium on which the information signal is desired to be taken.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are given, but the scope of the present invention is, unless otherwise stated in the following description, limiting the present invention.
It is not limited to these modes.

First Embodiment FIG. 1 shows a disk-shaped recording medium and an optical head processing device used in an optical head transfer device according to this embodiment. The optical head 10 is used for optical signal detection of one recording surface 14 and the other recording surface 16 of the disk-shaped recording medium 12. The optical head 10 is a so-called optical pickup, and preferably has a laser diode Ld, a photodiode PD, and an optical system OP.

The laser diode Ld outputs a laser beam in response to the signal S1 from the processing device 18 and applies it to the other recording surface 16 via the objective lens of the optical system OP. This laser light is reflected by the recording surface 16 and gives a signal for reproducing the recorded information on the surface 16 to the photodiode PD via the optical system OP. The photodiode PD transmits the information signal S2 to the processing device 18, and finally the L channel output and the R signal are output.
Channel output occurs. Disc-shaped recording medium 12
Is rotated by a motor 20. Here, the disc-shaped recording medium 12 is, for example, a compact disc (CD), a laser disc (LD), a video disc, or the like.

2 and 3 show a transfer device 22 for transferring or moving the optical head 10. The optical head 10 is fixed to the rotating body 24. The rotating body 24 is rotatably connected to the arm 26. The motor 28 is fixed to the arm 26, and by driving the motor 28, the rotating body 24 can be rotationally indexed in the arrow direction at every 180 °. One end of the arm 26 is fixed to the base portion 30. The base 30 has a gear 32 on its outer circumference. The base 30 is fixed to the ball screw male 34. The ball screw knife 36 is engaged with the ball screw knife 34. The ball screw knife 36 is rotationally stopped by a stator 40.

On the other hand, the ball screw male 36 is fixed to the gear 42. The gear 42 meshes with the gear 44.
The number of teeth of the gear 42 is set to be larger than the number of teeth of the gear 44. A pulley 46 is fixed to the gear 44. The pulley 46 and the pulley 50 of the motor 48 are connected via a belt 52. When the motor 48 is driven, the ball screw male 36 rotates, which allows the base 30 to move up together with the arm 26 in the arrow A direction. Gear 56,
The motors 58, 60 and the motor 62 are simultaneously raised by means not shown.

The gear 56 meshes with the gear 32, and the gear 60 meshes with the gear 58. Gears 56 and 58 are integral. The gear 60 is rotated by the motor 62. Therefore, when the gear 60 rotates, the base 30 can be rotationally indexed in the direction of arrow C about the central axis 60a via the gears 56 and 58. A pulse motor is preferably used as each motor.

Next, the transfer operation of the optical head 10 for the optical head 10 to read the recorded information on one recording surface 14 and the other recording surface 16 of the disk-shaped recording medium 12 will be described with reference to FIGS. 8 will be described in order. First, FIG. 2 and FIG.
Initially, the optical head 10 corresponds to the other recording surface 16 of the disk-shaped recording medium 12, as shown in FIG. By driving the motor 62, the arm 26 rotates around the base 30 (see the arrow X1 direction in FIG. 3). As a result, the optical head 10 moves in the radial direction from the outermost peripheral side toward the inner side along the recording surface 16 of the disk-shaped recording medium 12, and reads the recorded information on the surface 16.

Next, the motor 62 is driven to retract the arm 26 and the optical head 10 from the recording surface 16. That is, the arm 26 moves from the position PX to the position PY along the arrow X2 direction in FIG.
Transfer to. Therefore, the state shown in FIG. 5 is obtained. Motor 48
Drive the ball screw male 3 through the gears 44 and 42.
Rotate 6. Since the ball screw knife 34 is rotationally stopped by the stator 40, the ball screw knife 34 ascends in the arrow Z direction together with the arm 26 as shown in FIG. That is, the arm 26 rises in the thickness direction of the disc-shaped recording medium 12.

Next, the motor 62 is driven to rotate the arm 26 in the direction of arrow X1 in FIG. At the same time as this,
Alternatively, before starting to rotate the arm 26, the motor 28 is driven to rotate the optical head 10 by 180 °. Optical head 10
Faces the recording surface 14 of the disk-shaped recording medium 12 as shown in FIGS. The arm 26 can be moved from the outermost peripheral side of the optical head 10 inward in the direction of arrow X1 (radial direction) in FIG. 3 to read the recorded information on the surface 14. In this way, the optical head 10 can be moved corresponding to the recording surfaces 14 and 16 of the disk-shaped recording medium 12 to reproduce the information signal. The optical head 10 can be moved from the recording surface 14 to the recording surface 16 in the reverse procedure.

Second Embodiment In the above-described embodiment, the optical head 10 is driven 180 degrees by driving the motor 28 so as to face the recording surfaces 14 and 16, but the optical head 10 is arranged as follows. The direction of the head 10 may be changed. The same components as those of the first embodiment will be designated by the same reference numerals, duplicate description will be omitted, and different points will be mainly described.

As shown in FIG. 9, an optical head 10 is attached near the tip of the arm 26 so as to be rotatable around a rotary shaft 110 that rotates in a direction orthogonal to the extending direction of the arm 26. One end of the arm 26 is fixed to the ball screw knife 34. The ball screw female 34 is engaged with the ball screw male 36. A first auxiliary arm 100 and a second auxiliary arm 120 are arranged near the arm 26.

This embodiment is constructed as described above,
As shown in FIGS. 9 to 11, by lowering the first auxiliary arm 100, the optical head 10 rotates 90 ° along the arrow R. Next, as shown in FIGS. 12 to 14, the second auxiliary arm 120 is further moved leftward in the figures to rotate the optical head 10 by 90 °. That is, the optical head 10 changes from upward to downward and faces the recording surface 14 of the disc-shaped recording medium 12 as shown in FIG.

On the contrary, when the downward optical head 10 is turned upward, the operation shown in FIGS. 16 to 20 is performed. The first auxiliary arm 100 is lifted to rotate the optical head 10 by 90 ° in the θ direction, and the state shown in FIG. 18 is obtained. Next, the third auxiliary arm 130
Is moved to the left to rotate the optical head 10 by 90 ° so that the optical head faces upward.

When the arm 26 moves on the recording surface 14 or the recording surface 16 of the disk-shaped recording medium 12 to read the recorded information on the recording surface 14 or the recording surface 16, the optical head 10 is moved by the optical head 10. A motor (not shown) is attached to the optical head 10 so as to move in parallel to the radial direction of. The optical head 10 drives this motor to follow the disc-shaped recording medium 12 in the radial direction.

Regarding the inclination of the disc-shaped recording medium 12, that is, the skew, in the first embodiment described above,
This is dealt with by driving the rotation motor 28 of the optical head 10. In the second embodiment, a motor is attached separately.
Although the optical head 10 rotates 180 °, it is preferable that the wire (code) coming out of the optical head 10 is not a conventional flexible wiring material but an ordinary wire wiring. This increases the strength of the wiring material, and the optical head 1
You will be able to withstand 0 rotations.

Since the embodiment of the present invention is configured as described above, initially (initialization), the arm is located at the outermost periphery of the recording surface 16 below the disc-shaped recording medium, and the disc-shaped recording medium and the disc-shaped recording medium are formed. After the table of the recording medium is loaded in and chucked, the optical head can be accessed radially inward from the outermost circumference. At this time, the disk-shaped recording medium is a laser disk (L
D) or compact disc (CD) is detected. That is, it is first determined whether or not the laser disk (LD) has a large diameter. Further, when the optical head is transferred from the lower surface to the upper surface, the type of the disk can be judged from the outside (from the large disk).

By increasing the axial length of the ball screw male, it is possible to increase the vertical movement stroke length of the arm and the optical head, and it is adopted in the automatic changer type reproducing mechanism for the multiple type reproducing device for stacking a plurality of disks. it can.

[0026]

According to the present invention, the pick-up arm is moved in the axial direction of the disk-shaped recording medium so that the arm faces each recording surface, and the optical head is rotated with respect to the arm body. Since the recording surfaces of the disk-shaped recording medium are opposed to each other, it is not necessary to use a U-shaped member having a fixed shape as in the conventional case, and the size can be reduced. Moreover, since the arm operation and the optical head operation can be performed quickly, the optical head can access each surface of the disk-shaped recording medium at high speed.
Since a conventional U-shaped member having a fixed shape is not used, the disc-shaped recording medium has a large degree of freedom of movement in the thickness direction, and a plurality of disc-shaped recording media, in particular, the number of stacked discs differs each time the disc-shaped recording medium is used. Suitable for changers.

[Brief description of drawings]

FIG. 1 is a diagram showing an optical head and its periphery according to an embodiment of an optical head transfer device of the present invention.

FIG. 2 is a detailed view of a transfer device of the optical head of FIG.

FIG. 3 is a plan view showing the transfer of the optical head of FIG.

FIG. 4 shows a recording surface 1 below the disc-shaped recording medium with an optical head.
The figure which is facing 6.

FIG. 5 is a diagram in which the optical head is retracted from the optical head.

FIG. 6 is a diagram in which an optical head is raised.

FIG. 7 is a diagram in which an optical head is moved to a recording surface on a disk-shaped recording medium.

FIG. 8 is a diagram showing an optical head facing a recording surface on a disk-shaped recording medium.

FIG. 9 is a diagram showing an optical head facing upward in the second embodiment of the optical head transfer device according to the present invention.

FIG. 10 is a diagram in which the optical head of FIG. 9 is inclined.

FIG. 11 is a diagram showing the optical head of FIG. 10 facing sideways.

FIG. 12 is a diagram for further rotating the optical head of FIG.

FIG. 13 is a diagram showing the optical head of FIG. 12 starting to rotate.

14 is a diagram in which the optical head of FIG. 13 is inclined.

FIG. 15 is a diagram showing the optical head of FIG. 14 facing downward.

16 is a diagram in which the optical head of FIG. 15 is obliquely reversed.

FIG. 17 is a diagram showing the optical head of FIG. 16 returned to the side.

FIG. 18 is a diagram showing the optical head of FIG. 17 starting to rotate further.

FIG. 19 is a diagram showing the optical head of FIG. 18 in an inclined manner.

FIG. 20 is a diagram showing the optical head facing upward.

FIG. 21 is a diagram showing an example of a conventional optical head transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Optical head 12 Disc-shaped recording medium 14 One recording surface 16 The other recording surface 22 Transfer device 26 Arm 34 Ball screw female 36 Ball screw male

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Natsumi Isobe 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (3)

[Claims] 1. An optical head comprising: an optical head for irradiating a recording surface of a disk-shaped recording medium with laser light to receive reflected light from the recording surface; and an arm for supporting the optical head. In a transfer device for an optical head that moves along the surface, moving means for moving the arm in the axial direction of the disk-shaped recording medium to face the recording surface, and rotating the optical head with respect to the arm to move the optical head. An optical head transfer device, comprising: a rotating unit facing a recording surface of a disk-shaped recording medium. 2. The optical head transfer device according to claim 1, wherein the optical head attached to the arm is configured to rotate along a direction around a central axis of the arm. .. 3. The optical head at the tip of the arm,
The optical head transfer device according to claim 1, wherein the optical head transfer device is rotatably mounted around a rotation axis orthogonal to the extending direction of the arm.