KR200172916Y1 - Optical pickup moving apparatus - Google Patents

Abstract

An optical pickup transfer apparatus capable of controlling a transfer distance of an optical pickup when transferring the optical pickup in the radial direction of the disc is disclosed.

The optical pickup transfer apparatus includes a deck gear member having a deck, a drive source installed on the deck, a gear group transmitting a driving force of the drive source, a rack gear member coupled to the optical pickup on one side, and engaged with the gear group, and on the deck. It is provided with a guide rail for slidably supporting the optical pickup and position control means for controlling the position of the optical pickup. The position control means is provided along the guide rail on the deck opposite the rack gear member and has reflecting means having repeatedly arranged reflecting and absorbing portions, and is disposed on the rack gear member opposite to the reflecting means to position the optical pickup. And detection means adapted to detect.

Description

Optical pickup moving apparatus

The present invention relates to an optical pickup transfer apparatus, and more particularly, to an optical pickup transfer apparatus capable of controlling a transfer distance of the optical pickup when transferring the optical pickup in the radial direction of the disc.

In general, the optical pickup is mounted in the optical pickup transport apparatus and transported in the radial direction of the disk to irradiate light onto the recording surface of the disk and to receive the reflected light to record and / or reproduce information. To this end, the optical pickup transport apparatus requires precise control so that the optical pickup can follow the correct track position.

1 is a perspective view schematically showing a conventional optical pickup transport apparatus.

As shown, the optical pickup transfer device is coupled to one side of the optical pickup 20 and a pair of guide rails 35 installed on the deck 50 to transfer the optical pickup 20 in the radial direction of the disc. And a rack gear member 10 slidably supported by the one guide rail 35, a motor 30 installed on the deck 50 to provide driving force, and a driving force of the motor 30 to the rack gear member. It consists of a gear group 40 which transmits to (10). Here, the optical pickup 20 is slidably installed on the guide rail 35.

The magnet gear 41 fixed to the rotation shaft of the motor 30 of the gear group 40 is a gear that transmits the rotational force of the motor 30 to the first gear 45, a circular magnet (below) 43). On the deck 50 opposite to the magnet 43, a rotation angle measuring unit 44 is installed to detect a change in the magnetic field according to the rotation of the magnet 43 so that the rotation angle of the motor 30 can be known. have.

For example, the magnet 43 is formed by alternately installing different polarities, that is, N poles and S poles, at equal intervals along the circumference. In addition, the rotation angle measuring unit 44 includes a magnetoelectric conversion element 44a such as a hall IC, and measures the rotation angle of the motor 30 by detecting a change in the magnetic field signal due to the rotation of the magnet 43. I can do it.

When the motor 30 is rotated in the conventional optical pickup transfer device configured as described above, the rotation is transmitted to the rack gear member 10 by the gear group 40, and the rack gear member 10 is the motor 30. The optical pickup 20 is transferred in the radial direction of the disk by converting the rotational motion of the linear motion. At this time, since the rotation angle of the motor 30 is detected by the rotation angle measuring unit 44, the transport distance of the optical pickup 20 can be known, thereby controlling the transport distance of the optical pickup 20. At this time, the backlash generated by the meshing between the gears is connected to the first gear 45 by the first gear 45 and the relay gear 49, and the second gear 47 engaged with the rack gear member 10. Is suppressed).

On the other hand, even in the case of using the first and second gear 45, 47 for suppressing the backlash there is an assembly tolerance. Therefore, in the conventional optical pickup transfer apparatus as described above, the magnet gear 41 and the rotation angle measuring unit 44 determine the transfer distance of the optical pickup 20 by measuring the rotation speed of the motor 30. Due to the tolerance of the gear group 40, it is difficult to precisely position the optical pickup 20. In addition, since the optical pickup 20 is slidable along the guide rail 35, when an error that counts the number of tracks occurs in the disc, the optical pickup 20 is moved to both ends of the guide rail 35 to guide the rails. There is a problem that a malfunction occurs in contact with the stopper 50 provided at both ends of the 35.

The present invention has been devised to solve the above problems, and the structure of the optical pickup can be precisely controlled by improving its structure, and the optical pickup can be prevented from coming into contact with stoppers provided at both ends of the guide rail. It is an object of the present invention to provide an optical pickup transport apparatus.

1 is a perspective view schematically showing a conventional optical pickup transport apparatus;

2 is a perspective view schematically showing an optical pickup transport apparatus according to an embodiment of the present invention;

3 is a cross-sectional view taken along the line III-III of FIG.

4 is a plan view schematically showing the reflecting means of FIG.

<Description of the symbols for the main parts of the drawings>

120 Optical pickup 130

135 ... Guide Rail 137 ... Stopper

140 ... gear 150 ... deck

153 Position control means 160 Reflector means

163 ... Reflector 164 ... Absorption

170 Detecting means 173

174 ... receiver 175 ... circuit board

Optical pickup transfer device according to the present invention for achieving the above object and a deck; A drive source installed on the deck; A gear group for transmitting a driving force of the driving source; An optical pickup coupled to one side, the rack gear member having a rack gear part engaged with the gear group; A guide rail installed on the deck and slidably supporting the optical pickup; And a position control means for controlling the position of the optical pickup, wherein the position control means is installed along a guide rail on a deck facing the rack gear member and repeatedly disposed of reflections. Reflecting means having a portion and an absorption portion; And detecting means installed in the rack gear part opposite to the reflecting means to detect the position of the optical pickup.

The reflectors are disposed at equal intervals on the deck of the center of the guide rail, and are arranged to be different from the width of the center at both ends of the guide rail to limit the driving range of the optical pickup.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view schematically showing an optical pickup transport apparatus according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, and FIG. 4 is a plan view schematically showing the reflecting means of FIG. 2.

As shown, the optical pickup transfer device has a drive source 130, a gear group 140 for transmitting a driving force of the drive source 130, and a rack gear portion 111 meshing with the gear group 140. It comprises a rack gear member 110, a pair of guide rails 135 in which the rack gear member 110 is slidably installed, and a position control means 153 for controlling the position of the optical pickup 120. do.

The optical pickup 120 is coupled to one side of the rack gear member 110, and the optical pickup 120 is slidably supported by the guide rail 135.

The position control means 153 is a reflection means 160 is installed along the guide rail 135 on the deck 150 opposite the rack gear member 110 to control the position of the optical pickup 120 and And detection means 170 capable of detecting the position of the optical pickup 120 according to the signal of the reflecting means 160.

The reflecting means 160 is preferably a band-shaped reflecting member formed by repeatedly arranging a plurality of reflecting portions 163 and absorbing portions 164 on the deck 150 along the guide rail 135. As shown in FIG. 4, the widths of the reflecting portion 163 and the absorbing portion 164 of the reflecting means 160 are arranged at equal intervals on the deck 150 corresponding to the center portion A of the guide rail 135. On the deck 150 corresponding to both ends B of the guide rails 135, the optical rails 120 may be disposed at a different distance from the central portion A of the guide rails 135, for example, at a wider interval. It is provided to limit the distance. As shown in FIG. 4, the reflecting means 160 may have a width at the central portion A of the guide rail 135 of the reflecting portion 163. ) And width at both ends (B) ) Are different from each other ) May be provided. In addition, the absorbing portion 164 has a width at the central portion A of the guide rail 135 ( ) And width at both ends (B) ) Are different from each other ) May be provided. As such, the width of the reflecting portion 163 or the absorbing portion 164 at the end portion B of the guide rail 135 is to limit the driving range of the optical pickup 120.

Referring to FIG. 3, the detecting means 170 is preferably installed on the rack gear member 110 opposite to the reflecting means 160 provided in the deck 150. The detecting means 170 includes a light source unit 173 for emitting light, a light receiving unit 174 for detecting light emitted from the light source unit 173 and reflected by the reflecting unit 163 of the reflecting unit 170, And a circuit board unit 175 which enables position control of the optical pickup 120 by feeding back the position signal of the optical pickup 120 according to the detection signal of the light receiver 174 to the driving source 130. . The light source unit 173 may include a light emitting diode, a semiconductor laser, or the like, and the light receiving unit 174 may include a photodetector, that is, a photodiode. Since the light source unit 173 and the light receiving unit 174 are well known, detailed description and illustration are omitted.

The gear group 140 includes a drive gear 141 fixed to the shaft of the drive source 130, first and second gears 145 and 147, and a relay gear 149. At least one of the first and second gears 145 and 147 preferably includes a backlash gear.

The rotation of the drive source 130 is transmitted to the rack gear member 110 by the gear group 140 in the optical pickup transfer device provided in this way, the rack gear member 110 of the drive source 130 Since the rotational motion is converted into a linear motion, the optical pickup 120 is thus supported by the guide rail 135 to be transported in the radial direction of the disk. At this time, the transport distance of the optical pickup 120 is controlled by the position control means 153.

Since the position control means 153 directly controls the position of the optical pickup 120, the position control means 153 can be controlled regardless of the tolerance and the backlash of the gear group 140. That is, when the position of the optical pickup 120 is changed, when the light emitted from the light source unit 173 is reflected on the reflecting means 160, the emitted light is reflected by the reflecting unit 163 to receive the light receiving unit ( 174, when the light emitted from the light source unit 173 illuminates the absorption unit 164, there is no reflected light, so that the detection signal of the light receiving unit 174 changes according to the positional change of the optical pickup 120. Therefore, accurate transport distance measurement of the optical pickup 120 is possible. In addition, the detection signal of the light receiving unit 174 is fed back to the driving source 130 by the circuit board unit 175 to control the driving source 130 to enable accurate control of the optical pickup 120 transfer distance.

In the reflecting means 160, the reflector 163 and / or the absorber 164 are located on the deck 150 along the guide rail 135 within the central portion A of the guide rail 135, that is, within the radius of the disk. Are arranged at equal intervals, that is, at both ends B of the guide rail 135, the reflecting portion 163 and / or the absorbing portion 164 may be disposed at the center portion A of the guide rail 135, Since they are arranged at different intervals, the periods of the signals detected by the light receiving unit 174 are different from each other, so that the position of the optical pickup 120 can be accurately determined whether the disk is within or outside the radius of the disk. Therefore, even when an error occurs in counting the number of tracks of the disc, the optical pickup 120 is moved to both ends B of the guide rails 135 and the stoppers 137 provided at both ends B of the guide rails 135. It is possible to prevent the malfunction of the contact.

The optical pickup transport apparatus according to the present invention as described above enables the accurate position detection and control of the optical pickup regardless of the tolerance and backlash between the gears by the reflecting means and the detecting means. In addition, since it is possible to know whether the optical pickup is out of the radius of the disc, it is possible to prevent a malfunction that may occur when an error occurs in counting the number of tracks of the disc.

Claims (1)

Decks; A drive source installed on the deck; A gear group for transmitting a driving force of the driving source; An optical pickup coupled to one side, the rack gear member having a rack gear part engaged with the gear group; A guide rail installed on the deck and slidably supporting the optical pickup; An optical pickup transport apparatus comprising: position control means for controlling the position of the optical pickup; The position control means is provided along the guide rail on the deck opposite the rack gear member, the reflecting means having a reflecting portion and the absorbing portion repeatedly disposed; A light source unit installed at the rack gear member opposite to the reflecting unit to emit light, a light receiving unit installed at one side of the light source unit to detect light reflected from the light source unit, and light reflected by the light receiving unit; And a detecting means having a circuit board portion for controlling the position of the optical pickup by feeding back a position signal of a pickup to the driving source, the detecting means being capable of detecting the position of the optical pickup. At least one of the reflecting portion and the absorbing portion has a width at equal intervals at the center of the guide rail, and at both ends of the guide rail so as to be different from the width at the center of the guide rail to limit the driving range of the optical pickup. Optical pickup transfer device, characterized in that to be able to.