KR970011224B1 - Pick-up apparatus of laser disk player - Google Patents

Abstract

Disclosed is a pick-up apparatus of a laser disc player comprising a pick-up base(1), a pick-up plate(2) which is elastically installed to move up and down within the pick-up base, a pick-up which is elastically attached to the pick-up plate so that it can be rotated, a pick-up rotation means which is included in the pick-up plate(2) and formed in the pick-up so as to rotate the pick-up, a pick-up base moving means which is included in the pick-up base and moves to left and right the pick-up base, and a pick-up plate moving means which is included in the pick-up base(1) and moves up and down the pick-up plate(2). Thus, the reliability of the pick-up apparatus is improved and the manufacturing cost can be reduced.

Description

Pickup device for laser disc player

1 is a plan view showing a pickup apparatus of the present invention.

2 is a front view showing the pickup apparatus of the present invention.

Figure 3 is an enlarged view of the main portion showing a state of rotating the pickup constituting the pickup apparatus of the present invention by the pickup rotating means.

Figure 4 is an enlarged view showing the main portion of the pickup plate constituting the pickup device of the present invention to move the pickup plate by the pickup plate moving means.

* Explanation of symbols for main parts of the drawings

1: pickup base, 2: pickup plate,

4: protrusion, 5: pickup,

6: first motor, 7: first driving gear,

8: cam gear, 9: cam,

10: spring, 11: shaft,

12: second motor, 13: second drive gear,

14: pinion, 15: guide roller,

16: rotation axis, 17: third motor,

18: third drive gear 19: driven gear,

20: eccentric cam, 21: first injection groove,

22: the first support, 23: the first torsion spring,

24: the second recessed groove, 25: the first support piece,

26: second torsion spring

The present invention relates to a pickup device of a laser disc player, and more particularly, to simplify the structure while making it usable to the U-turning laser disc player described by the present applicant.

In general, a laser disc player is a device capable of reproducing video and audio recorded on a laser disc by means of pickup using a laser disc as a recording medium. A laser disc usually has two discs bonded to each other so that the A disc (bottom face) and the B disc are combined. As the surface (upper surface) is formed, the pickup moves to the B surface after the completion of the A surface reproduction, and the B surface is reproduced.

The pickup device, which has been generally used in the prior art, is a device used mainly by the Japanese pioneer as the contents disclosed by the prior art in the double-sided playing optical disc player and its control method, which is filed by the present applicant with the patent application No. 92-7994. For details, see Japanese Patent Laid-Open No. Hei 2-66779.

However, such a device is conventionally designed to be used in a 180 ° rotating-type laser disk player, so the flexible cable for transferring the pick-up signal to the main board is frequently twisted in actual use, thereby reducing reliability. there was.

In addition, as the structure is very complicated, miniaturization and thinning are not possible, there is a problem that the manufacturing cost is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the purpose of the present invention is to make it possible to use the U-turning laser disk player to improve reliability and to reduce the manufacturing cost by miniaturizing and thinning by a simple structure.

According to the present invention for achieving the above object, a pickup plate and a pickup plate elastically installed to move up and down in the pickup base, a pickup elastically installed to be rotatable to the pickup plate, and formed on the pickup and the pickup plate Pick-up rotating means provided in the pickup base to rotate the pickup, Pick-up base moving means provided in the pickup base to move the pickup base left and right, and the pickup base is provided in the pickup base to move the pickup plate up and down Provided is a pickup apparatus for the laser disk player of the present invention, which is constituted by a pickup plate moving means.

Hereinafter, the present invention will be described in more detail with reference to FIGS. 1 through 4 of the accompanying drawings.

1 is a plan view showing a pickup apparatus of the present invention, FIG. 2 is a front view showing a pickup apparatus of the present invention, and FIG. 3 is a main part showing a state in which the pickup constituting the pickup apparatus is rotated by a pickup rotating means. 4 is an enlarged view of the main portion showing a state in which the pickup plate constituting the pickup device of the present invention is moved by the pickup plate moving means, and the present invention picks up the pickup base 1 so as to be movable up and down. Resilient installation of the plate (2), the pickup plate is mounted on the center of the objective lens (3) and to one side, the resilient installation to rotate the pickup (5) formed with a projection (4), the pickup plate (2) ) Is coupled to the cam gear 8 so as to be rotated by receiving the driving force of the first motor through the first driving gear 7 while fixing the first motor 6 to be driven and supplied with power. In the cam gear, a cam 9 is formed to guide the protrusion 4 formed on the pickup 5 while rotating together with the cam gear 8, and the protrusion 4 is provided with a pair of springs 10. Along with the connection box, the other end of the spring 10 is connected to the pickup plate 2 so that the protrusion 4 is elastically guided to the cam 9. In addition, the shaft 11 is fitted to the pick-up base 1 so that both ends thereof are exposed to the outside, and the second motor 12 is fixed to be driven and supplied with power, and the second motor 12 is fixed to the second motor. The second drive gear 13 is axially coupled to rotate under the driving force, and both ends of the shaft 11 are rotated under the rotational force of the second drive gear 13 to impart a moving force to the pickup base 1. The pinion 14 is fixed and the guide roller 15 is fixed to guide the pick-up base 1 to be moved with a moving force.

In addition, the rotary shaft 16 is installed in the pickup base 1 so as to be rotatable, and the third motor 17 is fixed to be driven by being supplied with power. The third motor 17 is rotated by the driving force of the third motor 17. The third drive gear 18 is axially coupled to the rotating shaft 16, and the rotating shaft 16 is fixed with the driven gear 19 so that the rotating shaft 16 can be rotated by the rotational force of the third driving gear 18. The eccentric cam 20 is fixed to give the pick-up plate 2 with a moving force while rotating the eccentric 16. On the other hand, in order to be elastically installed on the pickup base 1 in the pickup plate 2, the first recessed grooves 21 are formed in both side wall portions of the pickup base, and a pair of first support pieces 22 are formed. And a hinge shaft of the pick-up plate 2 into each of the first recessed grooves 21, and a first torsion spring 23 of the hinge plate of the pick-up plate so that both end surfaces thereof are supported by the first support piece 22. Insert.

In addition, in order to allow the pickup 5 to be elastically installed on the pickup plate 2, the second recessed grooves 24 are formed on both side walls of the pickup plate, and a pair of second support pieces 25 are formed. The hinge shaft formed in the pickup 5 is inserted into each of the first recessed grooves 24, and the second torsion spring 26 is inserted into the hinge shaft of the pickup so that both ends thereof are supported by the second support piece 25.

Reference numeral 27 is a guide rod, 28 is a guide rail and 29 is a rack.

Referring to the operation and effects of the present invention configured as described above are as follows.

When the pick-up base 1 constituting the pick-up apparatus is installed to be guided to the guide rod 27 provided inside the machine, the guide rollers 15 at both ends of the shaft 11 fitted to the pick-up base 1 are guide rails ( The pinion 14 is geared to the rack 29 integrated with the guide rail 28 while being connected to be guided to 28.

When the disk seated on the tray (not shown) is completed by the loading device and the play button is selected, the spindle motor (not shown) is driven by the control signal of the control unit. The disk is reproduced by rotating the disk and reading data recorded on the disk while the pickup 5 constituting the pickup device moves horizontally from the inner side to the outer side of the disk. The data recorded on the lower surface (A side) is read first, and then U-turn is read to read the data recorded on the upper surface (B side).

Hereinafter, the pickup 5 will be described in detail the process of reading the data recorded on the A side of the disk.

When the second motor 12 fixed to the pickup base 1 is driven by a signal from the controller, this driving force is applied to the shaft 11 through the second drive gear 13 axially coupled to the second motor 12. Since the shaft 11 and the pinion 14 are rotated because the pinion 14 is transmitted to one pinion 14 fixed to both ends, the pick-up base 1 is guide rod ( 27, it slides horizontally in the direction of the arrow (from the inner side to the outer side of the disk) in the drawing.

In the above, when the pickup base 1 slides, the guide rollers 15 fixed to both ends of the shaft 27 rotate together with the shaft 11 while being guided to the guide rail 28. (1) is to stabilize the sliding movement.

When the pickup base 1 slides as described above, the pickup plate 2 elastically installed on the pickup base and the pickup 5 mounted on the pickup plate move together as the pickup base 1 moves, and the pickup 5 The laser beam is irradiated through the objective lens 3 installed in the < Desc / Clms Page number 5 >

On the other hand, when the disc is played, the beam irradiated from the objective lens 3 of the pickup 5 to read the data recorded on the disc must always strike at right angles (90 ^o ) to the rotating disc at the turntable. The reproducing condition is good only when the gap between (3) and the disc is kept constant at all times. In general, as the diameter of the laser disc is large, the amount of warpage of each part is slightly different. By selectively adjusting the beam irradiation angle of (3) so that the irradiated beam hits the disc surface in a perceptual manner, the distance between the objective lens 3 and the disc is also selectively maintained to maintain an appropriate interval. It must be adjusted to weeks.

Then, the process of adjusting the beam irradiation angle of the objective lens 3 and the process of adjusting the distance between the objective lens and the disk will be described in detail.

First, a process of adjusting the beam irradiation angle of the objective lens 3 will be described.

If the tilt sensor (not shown) installed on the pickup 5 measures the amount of deflection of the disk during disc play, the control unit calculates the measured value to forward and reverse drive the first motor 6 fixed to the pickup plate 2. Since the first drive gear 7 axially coupled to the first motor 7 rotates forward or reversely, the cam gear 8 having the cam 9 is also rotated forward or reversely.

In this way, when the cam 9 is rotated forward or reverse together with the cam gear 8, the cam 9, which is formed on one side of the pickup 5 and receives the elasticity of the spring 10, is rotated. Since the pickup 5 installed in the pickup plate 2 receives elasticity, it rotates in the forward direction or the reverse direction as shown in FIG. 3 according to the cam path, and is irradiated from the objective lens 3 of the pickup 5. The angle of the beam to be adjusted is continuously adjusted to the amount of deflection of the disk.

Rotating the pickup 5 installed on the pickup plate 2 while receiving elasticity includes a second recessed groove 24 formed on both side walls of the pickup plate 2 and a pair of second support pieces ( 25) is formed, and the hinge shaft formed in the pickup 5 is fitted into the second recessed groove 24, and the second torsion spring is supported at both ends by the second support piece 25 at the hinge shaft. (26) is possible because it is fitted.

Next, a process of adjusting the gap between the objective lens 3 and the disk will be described.

If the lift sensor (not shown) installed in the pickup 5 measures the distance between the objective lens 3 and the disk during disc playback, the control unit calculates this measurement, and if the measured value is higher or lower than the reference value, the pickup Since the third motor 17 fixed to the plate 2 is driven, the third drive gear 18 axially coupled to the third motor rotates forward or reversely, and the rotational force of the third drive gear is rotated by the rotation shaft 16. Since it is transmitted to the driven gear 19 fixed to the rotary shaft 16 and the driven gear 19 also forward or reverse rotation.

In this way, when the rotary shaft 16 and the driven gear 19 is rotated forward or reverse, the pick-up plate 2 while the eccentric cam 20 fixed to the rotary shaft 16 receives the rotational force of the rotary shaft 16. Since the pick-up plate is resilient, the pick-up plate moves upward or downward as shown in FIG. 4 while the gap between the objective lens 3 and the disc of the pickup 5 installed on the pick-up plate 2 is increased. It is continuously adjusted to the reference value.

Rotating the pickup plate 2 installed in the pickup base 1 while receiving elasticity includes a first recessed groove 21 formed on both side walls of the pickup base 1 and a pair of first support pieces. 22 is formed, a hinge shaft formed in the pick-up plate 2 is fitted into the first recessed groove 21, and the hinge shaft has a first end portion supported by the first supporting piece 22. Since the torsion spring 23 is fitted, it is possible.

As described so far, the beam irradiation angle of the objective lens 3 and the distance between the objective lens and the disk are continuously adjusted at the same time according to the amount of deflection of the disk. The base 1 completely exits the guide rod 27 and U-turns toward the B surface (upper surface) to regenerate the B surface.

Therefore, the present invention can be used for the U-turning laser disk player, so that the reliability is improved and the structure is simple, resulting in reduction in production cost by miniaturization and thinning.

Claims (6)

A pickup base 1, a pickup plate 2 elastically installed to move up and down in the pickup base, a pickup 5 elastically installed to be rotatable to the pickup plate, and a pickup plate 2) pick-up rotation means provided at 2) to rotate the pickup, pick-up base moving means provided at the pick-up base 1 to move the pick-up base left and right, and at the pick-up base 1 Pick-up device of the laser disc player, characterized in that configured as a pickup plate moving means for moving the pickup plate (2) up, down The method of claim 1, wherein the first recessed grooves (21) are formed in both side wall portions of the pickup base (1), and a pair of first support pieces (22) are formed, and the first recessed grooves (21) are formed. The hinge shaft of the pick-up plate 2 is inserted into the pick-up plate 2, and both ends of the pick-up plate 2 are fitted to the pick-up base 1 by inserting the first torsion spring 23 so that both ends thereof are supported by the first support piece 22. Pick-up device for a laser disc player, the pickup plate (2) is elastically installed. The method of claim 1, wherein the second recessed grooves 24 are formed on both side wall portions of the pick-up plate 2, and a pair of second support pieces 25 are formed, respectively. The hinge shaft formed in the pickup 5 is inserted into the pickup shaft, and the pickup shaft 2 is picked up by fitting the second torsion spring 26 so that both ends of the pickup shaft are supported by the second support piece 25. (5) The pickup device of the laser disk player is elastically installed. The method of claim 1, wherein the pickup rotation means is fixed to one side of the pick-up plate (1) for driving the first motor (6) and driving power, and the driving force of the first motor (6) is axially coupled to the first motor The first drive gear (7) is rotated by receiving, the cam plate (8), which is hinged to the pickup plate (2) and rotates under the rotational force of the first drive gear (7), is integrally formed with the cam gear A cam 9 that rotates together with the cam gear 8, and a protrusion 4 formed on one side of the pickup 5 to guide the cam 5 to be rotated about a hinge axis as guided by the cam 9. And a spring (10) having one end connected to the protrusion and the other end connected to the pickup plate (2) so that the protrusion (4) is elastically connected to the cam (9). According to claim 1, Pick-up base moving means is a shaft 11 is inserted into the pickup base 1, both ends exposed to the outside, and the second motor fixed in the pickup base (1) and driven to receive power ( 12), the second drive gear 13 is axially coupled to the second motor and rotated under the driving force of the second motor 12, and the first drive gear 13 is fitted to both ends of the shaft 11; The laser disk player is composed of a pinion (14) for providing a moving force to the pickup base (1) while rotating under the rotational force of the guide roller and a guide roller (15) for guiding the pick-up base (1) for receiving a moving force. Pickup device. The method of claim 1, wherein the pickup plate moving means is fixed in the pickup base (1) and the third motor (17) driven by the power supplied, and the third motor is coupled to the third motor to drive the driving force of the third motor (17) A third drive gear 18 that rotates to receive the rotation shaft, a rotation shaft 16 rotatably installed in the pickup base 1, and a rotation shaft 16 fixed to the rotation shaft to receive the rotation force of the first drive gear 18; A pickup device for a laser disc player, comprising an eccentric cam (20) for imparting a moving force to a pickup plate (2) while rotating together with a driven gear (19) to rotate and the rotating shaft (16).