KR950003772Y1 - Pick up moveing apparatus for cdp - Google Patents

Abstract

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Description

Optical pickup drive of optical disc player

1 is a plan view showing an optical pickup drive apparatus for an optical disc player according to the prior art.

2 is a sectional view taken along the line A-A of FIG.

3 is a plan view showing an optical pickup drive device for an optical disc player according to the present invention.

4 is a cross-sectional view taken along the line B-B in FIG.

5 is a cross-sectional view taken along the line C-C of FIG.

Figure 6 is an exploded perspective view showing the main configuration of the optical pickup drive device of the optical disk player according to the present invention.

7 is a cross-sectional view and a partial enlarged view showing an operating state of the present invention.

* Explanation of symbols for main parts of the drawings

21: main chassis 23,23 ′: guide shaft

24: optical pickup 25: pickup base

26,26 ′: Fixture 27,27 ′, 28,28 ′: Magnet

27a, 27'a, 28a, 28'a: shaft hole 29: drive coil

30: sensing coil 31,31 ′: York

The present invention relates to an optical pick up driving device for an optical disc player, and in particular, the configuration is simplified to further reduce the size of the product, reduce production costs, improve productivity, and also provide an optical pick up device. An optical pickup apparatus for an optical disc player which makes it possible to stabilize the signal and facilitate control.

The optical pickup driving apparatus of the optical disc player according to the prior art has a predetermined interval at a predetermined portion of the main chassis 1 installed in the optical disc player main body and having a through hole 2 as shown in FIGS. 1 and 2. Guide shafts 3 and 3 'traversing the through hole 2 are fixed to each other, and the high optical pickup module P is coupled to the guide shafts 3 and 3' to enable reciprocating movement.

The optical pickup module P includes a pickup base bracket 4 on a plate, a pickup base 5 fixed to an upper portion of the upper surface of the pickup base bracket 4, and the pickup base 5; It consists of an optical pickup 6 which is fixed to the top surface.

Guide bushes 7 and 7 'coupled to the guide shafts 3 and 3' are respectively interposed on both sides of the pickup base 5 to support the reciprocating movement of the optical pickup module P.

The driving coil bobbin 10 and the sensing coil bobbin 11, in which the driving coil 8 and the sensing coil 9 are wound, are respectively fixed to both sides of the upper surface of the pickup base bracket 4, and the driving coil bobbin 10 and the sensing coil bobbin 11 are fixed to both sides of the main chassis 1 and are movably coupled to the plates 12 and 12 'which are one of the elements constituting the magnetic circuit.

In addition, yokes 13 and 13 'constituting a magnetic circuit are fixed to both inner walls of the through hole 2 formed in the main chassis 1, and magnets 14 and 14 are fixed to the yokes 13 and 13', respectively. ′) Are fixed to each other.

Reference numeral 15 in the figure shows a turntable.

In the prior art optical pickup apparatus configured as described above, the driving magnetic circuit and the sensing magnetic circuit are formed by the magnets 14 and 14 ', the yokes 13 and 13', and the plates 12 and 12 '. In addition, since the driving coil 8 and the sensing coil 11 are wound in an orthogonal state in the magnetic circuit, when a current flows in the driving coil 8, the driving coil 8 and the sensing coil 11 are folded between the driving magnetic circuit and the driving coil 8. The driving force is generated in the direction of the arrow “D” shown in FIG. 1 by the left hand rule, and the optical pickup module P is guided by the guide shafts 3 and 3 ′ by the driving force. Done.

When the optical pickup module P moves as described above, a back EMF is generated between the magnetic circuit for sensing and the sensing coil 9 by the Fleming's right hand law, which is proportional to the moving speed. The pickup module P can be moved precisely to a desired position.

However, the optical pickup device of the conventional optical disc player as described above has a disadvantage in that the overall volume becomes large due to a complicated configuration requiring several parts, and the production cost increases due to the increase in the number of parts, and the productivity decreases. There was a problem.

In addition, since the driving force for driving the optical pickup module P is generated only in one direction, the optical pickup module P is moved while the balance is unbalanced, and thus the signal of the optical pickup device becomes unstable and the control becomes difficult. There were several issues.

It is an object of the present invention to provide an optical pickup device for an optical disc player, which can simplify the configuration, reduce the size of the product, reduce production costs, and improve productivity.

Another object of the present invention is to provide an optical pickup apparatus for an optical disc player that generates driving force for driving the optical pickup module in both directions, so that the signal of the optical pickup apparatus can be stabilized and easy to control.

In order to achieve the object of the present invention as described above, in the optical pickup device of the optical disk player, the pickup base having the optical pickup to the guide shaft fixed to both sides of the main chassis is coupled to enable reciprocating movement, the pickup base Cylindrical magnets are respectively press-fitted to both sides of the fixing holes formed at both sides of the coupling holes, to couple the guide shafts to the shaft holes of the magnets, and to wind the driving coils and the sensing coils at both ends of the pickup base, respectively, and at both sides of the main chassis. There is provided an optical pickup device for an optical disc player, characterized in that the yoke is fixed to each other so as to be maintained at a predetermined interval with the driving coil and the sensing coil.

Hereinafter, an optical pickup apparatus of an optical disc player according to the present invention will be described according to the embodiment shown in the accompanying drawings.

3 is a plan view showing the optical pickup driving apparatus of the optical disk player according to the present invention, FIG. 4 is a sectional view taken along line BB of FIG. 3, FIG. 5 is a sectional view taken along line CC of FIG. 3, and FIG. 6 is an optical disk player according to the present invention. An exploded perspective view showing a main configuration of an optical pickup drive device of FIG. 2, wherein the optical pickup device of the optical disc player according to the present invention supports the optical pickup 24 for reading information and the optical pickup 24. And a pickup base 25 for reciprocating motion, a drive coil 29 and a sensing coil 30 wound around both ends of the pickup base 25 to generate and detect magnetic flux, and both side surfaces of the pickup base 25. Cylindrical magnets 27, 27 ', (28, 28'), which are press-fitted on both sides of the fixing members 26, 26 'formed in the shaft hole and are formed with shaft holes 27a, 27'a, 28a, 28'a. And the shafts 27a, 27'a, and 28a, 28'a to guide the movement of the pick-up base 25. The guide shafts 23 and 23 ', the yoke 31 and 31' which are fixed to the driving coil 29 and the sensing coil 30 at regular intervals to form a magnetic circuit, and the guide shafts 23, 23 ') and the chassis 21 for fixing the yokes 31 and 31'.

Resin coating films 32 and 32 'are formed on the surfaces of the guide shafts 23 and 23' to allow the pickup base 25 to move smoothly.

The optical disc player optical pickup device according to the present invention configured as described above has cylindrical magnets 27, 27 ', (28, 28') press-fit fixed to both fixing members 26, 26 'of the pickup base 25. , The magnetic circuit is formed by the yokes 31 and 31 'and the guide shafts 23 and 23', and the magnetic flux flows in the direction of the arrow shown in FIG. do.

When a current flows through the driving coil 29 wound on the pickup base 25, the pickup base 25 moves the guide shafts 23 and 23 'by the driving force generated equally on both sides by the Fleming's left-hand law. Will be moved to the desired position.

When the pickup base 25 is moved in this way, a counter electromotive voltage is generated between the sensing coil 30 and the magnetic circuit by the Fleming's right-hand law, so the position is adjusted using this voltage to adjust the position. Move 25 to the desired position.

At this time, since the resin coating films 32 and 32 'are formed on the surfaces of the guide shafts 23 and 23', the movement of the pickup base 25 becomes smoother.

As described above, in the optical pickup device of the optical disc player according to the present invention, the pickup base serves as a bobbin, and the magnet for forming a magnetic circuit is cylindrical and coupled to both sides of the pickup base to further simplify the configuration. In addition to contributing to the miniaturization of the product, the reduction of the number of parts reduces the production cost, improves the productivity, and generates the driving force to be balanced on both sides, so that the signal of the optical pickup device is stable and the control is performed stably. There is an effect such as.

Claims (2)

Optical pickup 24 for reading information, a pickup base 25 supporting the optical pickup 24 for reciprocating motion, and a drive coil wound around both ends of the pickup base 25 to generate and detect magnetic flux. (29) and the sensing coil (30), and the press-fit fixed to both sides of the fixing holes (26, 26 ') formed on both sides of the pickup base 25, shaft holes (27a, 27'a), (28a, 28'a ) Is coupled to the cylindrical magnets 27, 27 ', 28, 28' and the shaft holes 27a, 27'a, 28a, 28'a to guide the movement of the pick-up base 25. The guide shafts 23 and 23 ', the yoke 31 and 31' which are fixed to the driving coil 29 and the sensing coil 30 at regular intervals to form a magnetic circuit, and the guide shafts 23, 23 ') and a chassis 21 for fixing the yokes 31 and 31'. The optical pickup apparatus according to claim 1, wherein resin coating films (32, 32 ') are formed on the surfaces of the guide shafts (23, 23') to facilitate the movement of the pickup base (25). .