JPH0773609A - Pickup feed mechanism - Google Patents

Abstract

PURPOSE:To maintain the specified positional relation between a guide shaft and switches for detecting a reproduction start position regardless of a fine adjustment in the driving direction of a pickup and to simplify an exchange operation of a switch. CONSTITUTION:The fine adjustment of the direction of the guide shaft 9 is made possible by displacing a base plate 15 mounted displaceably on a chassis 2 by means of an eccentric pin 22. The switches 28, 29 for detecting the reproduction start position are mounted on a switch mounting plate 30. This switch mounting plate 30 is fixed to a base plate 15. The guide shaft 9 and the switches 28, 29 are simultaneously displaced when the base plate 15 is displaced. The exchange of the switches 28, 29 is executed together with the switch mounting plate 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup feed mechanism in which a pickup can be driven and displaced in a direction normal to a disc, and more particularly, a switch for detecting a reproduction start position of the disc can be switched by the pickup. Regarding the pickup feed mechanism.

[0002]

2. Description of the Related Art In a disc reproducing apparatus, a trace position of a disc for picking up a signal is displaced to a reproduction start position set corresponding to a first portion of a recording area of the disc. For that reason,
In the disc reproducing apparatus, for example, Japanese Patent Publication No. 1-404
As disclosed in Japanese Patent No. 25, a switch is provided which is switched by the pickup when the trace position by the pickup is displaced to the reproduction start position, and it is detected by the switching state of the switch that the pickup is displaced to the reproduction start position. I am trying.

Further, in the disc reproducing apparatus, in order to ensure the maximum signal reading accuracy by the pickup,
It is necessary to finely adjust the driving direction of the pickup so that the trajectory of the trace position by the pickup will be the normal direction of the disc. Since the pickup is configured to be driven along with the guide shaft, the drive direction of the pickup is finely adjusted by finely adjusting the direction of the guide shaft.

[0004]

By the way, the switch for detecting the reproduction start position is arranged so that it can be directly switched by the pickup. Therefore, by finely adjusting the driving direction of the pickup, the guide shaft and the switch are switched. There is a problem in that the positional relationship of the switch is deviated, the position of the pickup when the switch is switched is slightly deviated from the set position, and the reliability of the switching operation of the switch is lowered. Therefore, the position of the switch must be adjusted after finely adjusting the driving direction of the pickup, which is a problem in terms of workability.

Further, the switch for detecting the reproduction start position is
Although it is a part where failures frequently occur from the past record, in the conventional disk reproducing device, it is difficult to replace the switch and adjust the position when the switch fails, which results in poor serviceability. There was a problem in terms.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a base plate displaceably mounted on a chassis by an eccentric pin and two axially different ones. The chassis, the other of which is supported by the base plate, a guide shaft for guiding the pickup in the driving direction, a switch for switching the pickup by displacement, and a switch for detecting the displacement position of the pickup, While being fixed to the base plate,
A switch mounting plate to which the switch is mounted,
By displacing the base plate, the guide shaft and the switch are simultaneously displaced.

[0007]

According to the present invention, the base plate movably attached to the chassis by the eccentric pin supports the other of the guide shafts, one of which is axially supported by the chassis, and the base plate is displaced to displace the guide shaft. Of the reproduction start position is mounted on the switch mounting plate, and the switch mounting plate is fixed to the base plate to displace the base plate to displace the guide shaft and the guide shaft. The switches are simultaneously displaced, and the switch mounting plate is mounted and removed so that the switches can be mounted and removed. By doing so, the present invention makes the positional relationship between the guide shaft and the switch constant regardless of the fine adjustment of the orientation of the guide shaft, and simplifies the switch replacement work.

[0008]

FIG. 4 is a perspective view showing a pickup feeding mechanism according to the present invention, which corresponds to a double-sided reproduction type disk player. In the figure, reference numeral 1 is a turntable for mounting a disc, which is fixed to a shaft of a spindle motor 3 attached to a chassis 2.

Reference numeral 4 is a pickup provided with an optical pickup portion 5 for optically reading a signal from a disc mounted on the turntable 1. The pickup 4
A drive motor 6, a reduction mechanism 7 for reducing the rotation speed of the motor 6, and a pinion gear 8 to which the driving force from the motor 6 is transmitted via the reduction mechanism 7 are mounted on the drive motor 6. There is.

Reference numerals 9 and 10 denote lower and upper guide shafts which are inserted into guide holes formed in the base of the pickup 4 and guide the trace position trajectory by the pickup 4 in the normal direction of the disc. The lower guide shaft 9 is attached to the chassis 2, and the upper guide shaft 10 is attached to an upper chassis (not shown).

Reference numeral 11 denotes a synthetic resin guide rail which is integrally formed with a rack 12 with which the pinion gear 8 of the pickup 4 is meshed and which is used to drive the pickup 4 . The guide rail 11 is a pickup
4 is formed in a U shape so that the disk 4 can be moved from one surface side to the other surface side, and the chassis 2 is arranged in parallel with the lower and upper guide shafts 9 and 10.
And an upper chassis (not shown).

Reference numeral 13 denotes an auxiliary rack 14 to which a drive force from the motor 6 is not applied and which is rotatably engaged with a gear (not shown) axially supported on the opposite side of the pinion gear 8 of the pickup 4. It is a synthetic resin auxiliary guide rail that is integrally formed and is used as an auxiliary to prevent slippage when the pickup 4 is driven. The auxiliary guide rails 13 are arranged facing each other in a U-shape having the same shape as the guide rails 11 in accordance with the driving direction of the pickup 4 , and are attached to the chassis 2 and an upper chassis (not shown). There is.

With the above-described structure, the pickup feed mechanism of FIG. 4 drives the motor 6 to transmit its driving force to the pinion gear 8 and rotate the pinion gear 8 in a state meshed with the rack 12. By doing so, the pickup 4 is driven in the forming direction of the rack 12. In this case, the pickup 4 is guided by the lower or upper guide shaft or 10 other than the arc-shaped portions of the guide rail 11 and the auxiliary guide rail 13 for reversing the trace surface of the disc and follows the normal direction of the disc. Driven.

By the way, the lower and upper guide shafts 9 and 10 are constructed so that the moving direction of the pickup 4 can be adjusted according to the normal direction of the disk.
Next, the mechanical portion for performing the adjustment will be described in detail. 1 and 2 respectively show the mechanical parts,
FIG. 3 is a plan view of an essential part of the present invention and an enlarged side view in which the guide rail 11 is omitted, and FIG. 3 is an enlarged sectional view on a straight line connecting A _{1 and} A ₂ in FIG. In the figure, 15
Is a base plate attached to the chassis 2 by screws 18 and 19 with spring washers 16 and 17, respectively, and the base plate 15 has the screws 18 of the chassis 2 even if it is attached to the chassis 2. The axial direction of the guide shaft 9 is set by the allowance in the left-right direction of FIG. 3 provided in the mounting hole 20 to be inserted or in the left-right direction of FIG. 3 provided in the mounting hole 21 into which the screw 19 of the chassis 2 is inserted. It is displaceable in a direction substantially orthogonal to.

Reference numeral 22 denotes an eccentric pin having a shape in which two cylinders having different diameters are stacked with different axes, and the eccentric pin 22 is formed in a circular shape by forming a cut-raised portion 23 at the edge of the base plate 15. The circular holes formed and the rectangular holes 26 formed in the chassis 2 in a rectangular shape are arranged so that the respective cylindrical portions are in contact with each other at their edges. Therefore, when the eccentric pin 22 is rotated, the turning force acts on the base plate 15 with respect to the chassis 2. Therefore, by rotating the eccentric pin 22, the base plate with respect to the chassis 2 is rotated. 15 can be displaced in a direction substantially orthogonal to the axial direction of the guide shaft 9.

Here, the guide shaft 9 is attached to the pedestal 24 by screws 18 at a position near the start end near the turntable 1.
It is axially supported by the base plate 15 in a state of being seated on the other hand, while the screw 2
It is axially supported by the chassis 2 while being seated on the pedestal by 5. Therefore, when the eccentric pin 22 is rotated, the guide shaft 9 is rotated about the screw 25 as a fulcrum according to the displacement amount of the base plate 15.

Further, the guide rail 1 is attached to the base plate 15.
A point near the starting end of the first guide shaft 9 is pivotally supported by a screw 19 similarly to the guide shaft 9. And
The guide rail 11 is pivotally supported on the chassis 2 by a screw 27 at one point near the end of the guide shaft 9.
The guide rail 11 is pivotally supported at two points equidistant from each other at positions corresponding to the two points at which the guide shaft 9 is pivotally supported. Therefore, when the base plate 15 is displaced and the angle of the guide shaft 9 is adjusted, the guide rail 11 is rotationally displaced by the same amount at the same time as the guide shaft 9, and the positional relationship with the guide shaft 9 is kept parallel. .

Therefore, it is possible to prevent the drive of the pickup 4 from being disturbed when the angle of the guide shaft 9 is adjusted. By the way, switches 28 and 29 are provided to detect that the pickup 4 is displaced to the reproduction start position of the disc. The switch 28
And 29 are set and arranged so that it is possible to detect that the pickup 4 is displaced to the reproduction start position corresponding to the type of the disc to be reproduced (video disc or CD) depending on the combination that can be switched. It is fixed. The switch mounting plate 30 is positioned by inserting the protrusions 31 and 32 formed in the base plate 15 into the holes formed in the switch mounting plate 30, and is fixed to the base plate by screws 33.
It is indirectly attached to the chassis 2 via the base plate 15. That is, the switches 28 and 29 are mounted by screwing the switch mounting plate 30 having the switches 28 and 29 mounted at predetermined positions to the base plate 15 at predetermined positions with screws. Therefore, the switch 2
8 and 29 can be attached to the chassis 2 at the same time and without shifting the positional relationship.

Further, since the switch mounting plate 30 is indirectly mounted on the chassis 2 via the base plate 15 as described above, when the base plate 15 is displaced, it is displaced together. The switches 28 and 29 are attached to the folded portion 30a of the switch mounting plate 30 arranged in the hole 34 formed in the chassis 2, and the folded portion 3 is provided.
0a is formed so that its surface direction is parallel to the axial direction of the guide shaft 9. Therefore, when the base plate 15 is displaced, the mounting angles and arrangement directions of the switches 28 and 29 are displaced at substantially the same angle as the guide shaft 9.

Therefore, the angle adjustment of the guide shaft 9 for adjusting the moving direction of the pickup 4 can be performed while maintaining the positional relationship between the guide shaft 9 and the switches 28 and 29 in parallel. At the end of the switch mounting plate 30 far from the screw fixing position, the folded-back portion 30a is formed.
The hook-shaped projection 35 formed on the upper surface of the switch 2 is inserted into the hole 36 formed in the chassis 2 with a margin, and is locked to the edge of the hole 36 to stabilize the mounting state of the switch mounting plate 30. In addition, the displacement of the switch mounting plate 30 is not hindered.

The guide shaft 9 of the pickup 4
The lower part of the base part through which the
The push button portion is pressed, and the switches 28 and 29 are directly switched by the pickup 4 . Also, in the above-described embodiment,
Although only the lower chassis 2 side to which the spindle motor 3 is fixed has been described, the upper chassis side has a similar structure (not shown), and the upper guide shaft 10 and the reproduction start position. The angle of the guide shaft 10 can be adjusted without changing the positional relationship with the detection switch (not shown). However, it is necessary to displace the pickup 4 to the upper side only when reproducing the double-sided recording disk, and since the reproduction start position of the double-sided recording disk is one, only a single switch is installed on the upper side.

[0022]

As described above, according to the present invention, the guide shaft and the switch for detecting the reproduction start position can be simultaneously rotated and displaced by the same amount. Therefore, the positions of the guide shaft and the switch can be changed. It is possible to adjust the position of the guide shaft for adjusting the trajectory traced by the pickup in the normal direction of the disc without shifting the relationship, and the adjustment prevents the switching of the switch from being disturbed. A feeding mechanism can be provided.

Further, according to the present invention, since the switch for detecting the reproduction start position is mounted on the switch mounting plate fixed to the base plate, the switch mounting plate is mounted and detached to thereby switch the switch. It is possible to provide a pickup feed mechanism which can be attached and detached, and has a good serviceability for exchanging the switch.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a main part of the present invention.

FIG. 2 is an enlarged sectional view showing an embodiment corresponding to FIG.

FIG. 3 is an enlarged sectional view on a straight line connecting between A _{1 and} A ₂ in FIG.

FIG. 4 is a perspective view for explaining the outline of a pickup feeding mechanism according to the present invention.

[Explanation of symbols]

2 chassis 4 pickup 9,10 guide shaft 15 base plate 22 eccentric pin 28,29 switch 30 switch mounting plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuo Imai 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A pickup feed mechanism in which a pickup can be driven and displaced in a normal direction of a disc, and a base plate displaceably mounted on a chassis by an eccentric pin and one of two points in different axial directions. The chassis, the other of which is supported by the base plate, a guide shaft for guiding the pickup in the driving direction, a switch for switching the pickup by displacement, and a switch for detecting the displacement position of the pickup, A pickup feed characterized by comprising a switch mounting plate to which the switch is mounted and being fixed to a base plate, and by displacing the base plate, the guide shaft and the switch are simultaneously displaced by the same amount. mechanism.