KR100200232B1 - Device for feeding pickup unit of an optical disk player - Google Patents

Abstract

The present invention discloses a pick-up unit feeding apparatus of an optical disc player.

In a pick-up unit feeding apparatus of a general optical disc player, a pickup unit is slidingly moved on the inner and outer circumferential sides of the optical disc by adding and subtracting the speed thereof through a very complicated servo circuit. Therefore, the design is very troublesome, and in particular, there is a problem that stable recording / reproduction can not be performed in a high-speed mechanism.

In order to solve the above problems, the present invention provides a method of controlling a transfer speed of a pickup unit by varying a rotation speed of a transfer screw on the basis of a time point at which a pickup unit is positioned on an inner or outer peripheral side of an optical disk, In addition, it is possible to perform stable recording / reproduction even in a high-speed mechanism.

Description

The pick-up unit feeding device of the optical disc player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk player, and more particularly, to a pick-up unit feeding apparatus that performs recording / reproduction from an optical disk.

2. Description of the Related Art Generally, an optical disc player includes a loading unit to which a tray is loaded, a pick-up unit that scans a laser beam toward the optical disc and reads information through the beam reflected from the loading unit, A feeding unit for sliding the pickup unit in the radial direction of the optical disk, and a chucking unit and a tilt unit for clamping the disk on the turntable.

In such an optical disc player, particularly, the feeding unit is one of very important components for precisely transferring a pickup unit for performing recording / reproduction from the optical disc.

FIG. 1 shows a pick-up unit feeding apparatus of such a general optical disc player.

This is because an optical disc is mounted on a turn table driven by a spindle motor (not shown), and a pickup unit 2 for reading a record from the optical disc in the radial direction of the optical disc, And is slid and conveyed by the feeding device.

At this time, one end of the pick-up unit 2 is slidably supported by the guide member 3, and the other end receives power from the feeding means.

A feeding motor M in which a gear 4 is fixed on a rotating shaft thereof is disposed on a main chassis adjacent to the turntable 1 and a feeding motor M The gear 5 is engaged.

A conveying screw 6 is rotatably supported at the center of the gear 5 such that both ends of the conveying screw 6 are rotatably supported on the main shaft. The conveying screw 6 is screwed to one side of the pick-up unit 2 and consequently receives power from the feeding motor M so that when the conveying screw 6 is rotationally driven, the pick-up unit 2 Is slidably moved along the transporting screw 7, that is, in the radial direction of the optical disk, and performs recording / reproduction.

However, in such a pick-up unit feeding apparatus of the conventional optical disc player, servo control can not be performed with high precision, which poses a problem that it is difficult to record / reproduce a stable disc.

The reason why the servo control can not be performed very precisely in this way is that a signal format (format) of a disk generally adopts a method (CLV system) in which a linear velocity is constant in an inner circumference and an outer circumference, The amount of data to be read must always be the same. Therefore, in the inner circumference, the track change is so severe that the feeding device should also correspond to it. That is, it is necessary to obtain a variable deceleration ratio. However, the engagement between the plurality of gears (4,5) It is difficult to obtain the deceleration ratio, and therefore, it is not useful to perform the servo control with high accuracy.

In order to solve such a problem, the servo control circuit must be constructed in a very complicated manner.

Such a problem is particularly remarkable in performing recording / reproducing from an optical disk rotating at high speed, such as a CD-ROM driver, which has become popular recently in recent years.

The present invention relates to a pick-up unit feeding device of an optical disc player capable of accurately reading a signal from a disc rotating at high speed and simplifying a servo circuit, The present invention has been made in view of the above problems.

In order to solve such a problem, a pick-up unit feeding apparatus of an optical disc player according to the present invention comprises a pick-up unit, one end of which is slidably supported on a guide shaft on the base, and the other end thereof is fastened to a feed screw, A feeding motor which is positioned on an adjacent base and on which a spur gear of a predetermined length is pivotally supported; And a speed displacement unit disposed between the feeding motor and the pick-up unit and configured to transmit the power from the feeding motor to the feed screw in a variable manner to vary the rotational speed of the feed screw. .

FIG. 1 is a schematic perspective view of a conventional pickup unit feeding apparatus. FIG.

FIG. 2 is a schematic plan view of a pick-up unit feeding apparatus of an optical disc player according to the present invention; FIG.

Figure 3 is an excerpt from the lumbar vertebra.

4 and 5 are plan views showing the operating state of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10: Base 11: Feed screw

20: pick-up unit 30: feeding motor

31: Spur gear 40: Speed displacement means

41: support shaft 42, 43, 45, 46: first, second,

44: auxiliary spur gear 50: switching means

51: Operation lever 51a, 53a:

52, 54: guide projection 53: movable lever

60: locking means 61: guider

62: Lock lever 62a:

62b:

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

FIG. 2 is a schematic plan view of a pick-up unit feeding apparatus of an optical disc player according to the present invention, FIG. 3 is an exploded perspective view of a main part, and FIGS. 4 and 5 are plan views showing an operating state of the present invention.

The pick-up unit feeding apparatus of the optical disc player according to the present invention is roughly divided into a base, a base 10, a pickup unit 20, a feeding motor 30 and a velocity displacement means 40.

One end of the pickup unit 20 is slidably supported on the base 10 and the other end of the pickup unit 20 is coupled to the feed screw 11 so that the optical disk D is rotated by the rotation of the feed screw 11. [ As shown in Fig.

On the other hand, the feeding motor 30 is positioned on the base 10 adjacent to the pick-up unit 20, and the spur gear 31 is pivotally supported on the rotation axis within a predetermined length range.

The speed displacement means 40 is disposed between the feeding motor 30 and the pick-up unit 20 to vary the power from the feeding motor 30 to variably rotate the feed screw 11, 20 in the radial direction of the optical disc D.

The support shaft 41 is positioned between the feed screw 11 and the feeding motor 20 so as to be parallel to the feed screw 11 and the inner peripheral surface of the optical disk D And the first gear 42 is pivotally supported at the end of the conveying screw 11 on the side adjacent thereto. A second gear 43 is pivotally supported on one side of the conveying screw 11 spaced apart from the first gear 42 by a predetermined distance. It has a relatively large number of teeth.

The auxiliary spur gear 44 is engaged with the spur gear 31 of the feeding motor 30 and is supported on the outer peripheral surface of one side of the support shaft 41. The auxiliary spur gear 44 The first and third gears 45 and 46 selectively engaged with the first and second gears 42 and 43 are axially supported on the upper and lower sides by the sliding movement of the support shaft 41, In particular, the third gear 45 has a relatively larger number of teeth than the fourth gear 46.

At this time, in order to selectively engage the first and second gears 42 and 43 and the third and fourth gears 45 and 46, the support shaft 41 is slidably moved in the inner and outer directions of the optical disc D The switching means 50 is provided.

An operation lever 51 is located at a position adjacent to the conveying screw 11 and the other end of the operation lever 51 is connected to the inside of the optical disk D The upper end adjacent to the inner circumferential side with respect to the outer circumferential direction is engaged with the lower end of the support shaft 41, and the upper grooves 51a are formed in the predetermined length along the same direction on the other upper surface.

At this time, a first guide 52 protruding from the base 10 is slidably inserted into the groove 51a of the operation lever 51. [ That is, the operation lever 51 is slidably supported by the guide protrusion 52 in the inner and outer directions of the optical disc D.

On the other hand, a movable lever 53 is rotatably supported on the base 10 between the conveying screw 11 and the operation lever 51. One end of the movable lever 53 is supported by a support member And is fixed to the side surface. At this time, a groove 53a is formed in the other side of the movable lever 53 along the longitudinal direction within a predetermined length. A guide protrusion 54 protruding from the operation lever 51 is slidably inserted into the groove 53a .

At this time, on the operating lever 51 and the base 10, the first and second gears 42 and 43 and the third and fourth gears 45 and 46 are selectively moved in a state in which the operating lever 51 is slidably moved. A locking means (60) is provided for maintaining this in the engaged state.

In the detailed structure of the locking means 60, on the lower side of the above-described movable lever 53, that is, on the base 10 of the portion located on the outer peripheral side with respect to the inner and outer peripheries of the optical disk D A guider 61 is provided. A lock lever 62 is rotatably supported on the upper surface of the operation lever 51. A pickup unit 20 is fed to one end of the lock lever 62 from the inner periphery side to the outer periphery side of the optical disk D A pushing piece 62b which is pressed by the movable lever 53 is extended and the other end of the pushing piece 62b is engaged with the guider 61 by movement from the outer periphery to the inner periphery of the pick- Respectively.

At this time, the center of the lock lever 62 is engaged with the hinge center portion of the lock lever 62, and both ends of the lock lever 62 are engaged with one side of the latch piece 62b and the torsion spring 63 So as to be elastically supported in a clockwise direction.

At this time, the guider 61 is preferably composed of a fixed shaft 61a projecting from the base 10 and a guide roller 61b rotatably coupled on the right shaft 61a, So that the engaging operation between the engaging piece 62b of the lever 62 and the guider 61 is smoothly performed.

Operation of the pick-up unit feeding apparatus of the optical disk player having the above-described structure will be described below.

4, when the pickup unit 20 is slidably moved in the inner peripheral direction from the outer circumferential direction of the optical disk, the movable lever 53 coupled to one side of the pickup unit 20, So that the operation lever 51, to which the other end of the movable lever 53 is coupled, is slid in a direction opposite to the conveyance of the pick-up unit 20. That is, the guide protrusion 52 on the base 10 is guided and slidably conveyed through the elongated groove 51a formed on the lower side surface thereof. At this time, when the operating lever 51 is slid in a direction opposite to the feeding direction of the pick-up unit 20, the supporting shaft 41 coupled with the upper end of the operating lever 51 is the same as the operating lever 51 So that the second gear 43 and the fourth gear 46 are meshed with each other. The rotational force between the spur gear 31 and the fourth gear 44 of the feeding motor 30 is reduced and transmitted to the second and fourth gears 43 and 46 so that the feeding screw 11 has a small rotational speed And is rotationally driven.

At this time, the lock lever 62 hinged to the operation lever 51 is transferred together with the operation lever 51, so that the engagement piece 62b extending from the other end of the lock lever 62 is supported on the base 10 And is held by the guider 61 so that the operating lever 51 is maintained in the transported state. Further, the lock lever 62 is pressed and supported by the torsion spring 63 toward the guider 61, so that the lock lever 62 is maintained in a firmly supported state without generating the flow.

When the pickup unit 20 is operated to reproduce the optical disc in such a state, the pickup unit 20 must be gradually and slidly transferred from the inner circumference side to the outer circumference side of the optical disc.

5, the movable lever 53 is rotated in the counterclockwise direction, and at the same time, the operation lever 51 is rotated in the counterclockwise direction as shown in FIG. 5, And is slid toward the inner circumferential side of the disk. Therefore, the support shaft 41 coupled to the operation lever 51 is slidably moved toward the inner circumferential side, and at the same time, the first gear 42 and the third gear 45 are engaged with each other.

The power from the feeding motor 30 is accelerated and transmitted to the first and third gears 42 and 45 through the spur gear 31 and the auxiliary spur gear 44 so that the feeding screw 11 The pickup unit 20 is rotated at a relatively high speed as compared with the engagement of the second and fourth gears 43 and 46 so that recording / reproducing is performed from the optical disc while the pickup unit 20 is being transported at a relatively high speed. At this time, the lock lever 62 supporting the position of the operation lever 51 releases the engagement state with the guider 61, so that the operation lever 51 is prevented from sliding and being fed. The movable lever 53 is rotated in the counterclockwise direction by the pickup unit 20 being conveyed to the outer circumferential side while one end of the movable lever 53 is pressed against the pressing piece of the lock lever 62 62a so that the lock lever 62 is rotated counterclockwise. Therefore, the locked state between the locking piece 62b and the guider 61 is released.

As described above, according to the pickup unit feeding apparatus of the optical disc player according to the present invention, the feed speed of the pick-up unit on the inner and outer sides of the optical disc can be varied by varying the rotational speed of the feed screw to simplify the configuration of the servo circuit And it is possible to perform stable recording / reproduction even in a high-speed mechanism such as a CD-ROM.

Claims (5)

A pickup unit 20 whose one end is slidably supported on a guide shaft on the base 10 and the other end is fastened to the feed screw 11; A feeding motor 30 which is positioned on the base 10 adjacent to the pick-up unit 20 and on which a spur gear 31 of a predetermined length is pivotally supported; And is positioned between the feeding motor 30 and the pick-up unit 20 so as to variably transmit the power from the feeding motor 30 onto the conveying screw 11 to adjust the rotational speed of the conveying screw 11 (40) for varying the speed of the pick-up unit. The apparatus according to claim 1, wherein the speed displacement means (40) comprises: a support shaft (41) positioned between the feed screw (11) and the feeding motor (30) in parallel with the feed screw (11); A first gear (42) pivotally supported at an end of the conveying screw (11) adjacent to an inner circumferential surface of the optical disk; A second gear 43 that is pivotally supported on a conveying screw 11 spaced apart from the first gear 42 by a predetermined distance and has a relatively larger number of teeth than the first gear 42; An auxiliary spur gear 44 which is pivotally supported on an outer peripheral surface on the center side of the support shaft 41 and engages with the spur gear 31 of the feeding motor 30; A third gear (45) arranged on the support shaft (41) with the auxiliary spur gear (44) as a center and selectively engaged with the first gear (42); A fourth gear 46 having a relatively small number of teeth as compared with the third gear 45 and selectively meshing with the second gear 43; The support shaft 41 is slidably moved in the inner and outer directions of the optical disk so that the engagement between the first and third gears 42 and 45 and the engagement between the second and fourth gears 43 and 46 (50) for switching the pickup unit (50) to the pickup unit (50). 3. The optical pickup device according to claim 2, wherein the switching means (50) has one end on the inner circumferential side thereof coupled to an end of the support shaft (41) on the inner and outer circumferential direction of the optical disk, An operation lever 51 having an elongated groove formed in a predetermined length in the conveying direction of the unit 20; A guide projection (52) extending from one side of the base (10) and slidably inserted into the groove of the operation lever (51) to guide the movement of the operation lever (51) in the longitudinal direction; Both ends of which are fixed to one side of the pick-up unit 20 and the upper surface of the center of the operation lever 51, and a predetermined length A movable lever 53 having an elongated groove 53a formed therein; A guide protrusion 54 extended from one upper surface of the operation lever 51 and slidably inserted into the groove 53a of the movable lever 53; And a locking means (60) for holding the position of the operation lever (51) in a state that the operation lever (51) is slid and conveyed. 4. The apparatus according to claim 3, wherein the locking means (60) comprises: a guider (61) protruding from the base (10) on the outer peripheral side relative to the movable lever (53); The center of gravity of which is pivotally supported on the upper surface of one side of the operating lever 51 and which is pressed by the movement from the inner periphery to the outer periphery of the pick-up unit 20 about the pivotally supported portion A lock lever 62 having an engaging piece 62b which is engaged with the guider 61 by movement from the outer periphery side to the inner periphery side of the pick-up unit 20; The center of which is coupled to the center of rotation of the lock lever 62 and both ends of the lock lever 62 are coupled to one side of the latch piece 62b and one side of the operation lever 51, And a grounding spring (63) elastically supporting the pickup unit (6). The optical disc drive according to claim 4, wherein the guider (61) comprises: a fixed shaft (61a) projecting from the base (10); and a guide roller (61b) rotatably supported on the fixed shaft The pickup unit feeding device of the player.