JPH06338151A - Pickup sending mechanism - Google Patents

Abstract

PURPOSE:To adjust the position of a guide shaft without shifting the position relation of the guide shaft and a driving rail in a self-propelling type pickup sending mechanism. CONSTITUTION:A guide shaft 9 for guiding the sending direction of a pickup 4 and a driving rail 11 used for driving the pickup are linked with a linking member 15 at one end. The linking member 15 is attached to a chassis 2 so that the linking member can be displaced. The above-described guide shaft 9 and the above-described driving rail 11 are rotatably supported with respect to the chassis 2 at a position, which is separated by about the same distance from the linking points at the above described linking member 15. Therefore, the above described linking member 15 is displaced. Thus, the guide shaft 9 and the above described rail 11 are rotated and displaced at the same time, and the rotating and displacement amounts are made to agree with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called self-propelled pickup feed mechanism in which a drive motor is mounted on the pickup side, and more particularly to a pickup feed mechanism suitable for use in a double-sided reproduction type disc player. .

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Publication No. 5-798, there is known a double-sided reproduction type disk player configured to continuously reproduce both sides of a disk by using a single pickup. ing. In such a disc player, because of the structure in which the pickup is moved from one side of the disc to the other side, a pickup driving motor and a pinion gear driven by the motor are usually mounted on the pickup in parallel with the guide shaft. A feed mechanism of a self-propelled pickup is used, in which a rack on which the pinion gear is meshed is formed on a rail to be arranged so that the pickup is guided and driven by the guide shaft.

[0003]

By the way, in the disc player, in order to improve the signal reading accuracy by the pickup, the pickup feed mechanism is adjusted so that the trajectory of the trace position by the pickup is correctly in the normal direction of the disc. There is a need to. The trace position trajectory by the pickup is performed by adjusting the direction of the guide shaft. However, in the feed mechanism of the self-propelled pickup described above, when the guide shaft is adjusted, the guide shaft and the rail are parallel to each other. If it is not secured, there is a problem that the meshing between the pinion gear and the rack deteriorates, and smooth pickup feed cannot be achieved.

In order to solve the problem, it is possible to adjust the rail according to the guide shaft.
Adjusting independently of each other makes adjustment work complicated,
There is a problem that workability is deteriorated.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a pickup equipped with a driving motor and a pinion gear driven by the motor, and a trace by the pickup. A guide shaft mounted on the chassis for guiding the position orbit in the normal direction of the disc and a rack arranged parallel to the guide shaft and meshing with the pinion gear are formed to drive the pickup. A drive rail used for the above, and a connecting member for connecting the guide shaft and the drive rail at one end, the connecting member is displaceably attached to the chassis, and the guide shaft and the drive are provided. The rails can be rotated with respect to the chassis at positions that are approximately equidistant from the connection points of the connection members. Forms to support to.

[0006]

According to the present invention, the guide shaft for guiding the feed direction of the pickup and the drive rail used for driving the pickup are connected at one end by the connecting member, and the connecting member is displaceably attached to the chassis. At the same time, the guide shaft and the drive rail are rotatably supported with respect to the chassis at positions separated from the connection point of the connection member at substantially equal distances, thereby displacing the connection member and thereby the guide shaft. And simultaneously rotating and displacing the drive rail,
The rotational displacement amounts are made to match. This prevents the drive system of the pickup feed mechanism from being hindered by adjusting the guide shaft.

[0007]

2 is a perspective view showing a feed mechanism of a pickup according to the present invention, which corresponds to a double-sided reproduction type disc 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 including 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 are inserted into through holes (not shown) formed in the base of the pickup 4 , and the lower and upper sides for guiding the trace position trajectory by the pickup 4 in the normal direction of the disk. Is a guide shaft,
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 drive rail which is integrally formed with a rack 12 with which the pinion gear 8 of the pickup 4 is meshed and is used to drive the pickup 4 . The drive 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. This is a synthetic resin auxiliary rail that is integrally formed and is used as an auxiliary for slip prevention when driving the pickup 4 . The auxiliary rails 13 are arranged so as to face each other in a U-shape having the same shape as the driving rails 11 in accordance with the driving direction of the pick-up 4.
And an upper chassis (not shown).

In the pickup feed mechanism of FIG. 2 having the above-described structure, when the motor 6 is driven, the driving force is transmitted to the pinion gear 8 and the pinion gear 8 is moved.
Is rotated while being engaged with the rack 12, 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 9 or 10 except the arcuate portions of the drive rail 11 and the auxiliary rail 13 for reversing the trace surface of the disc in the normal direction of the disc. Driven along.

By the way, the lower and upper guide shafts 9 and 10 are so constructed that the moving direction of the pickup 4 can be adjusted according to the normal direction of the disk.
FIG. 1 is a plan view of a main portion of the present invention showing a mechanical portion for performing the adjustment. In FIG. 1, reference numeral 15 is a connecting plate attached to the back surface of the chassis 2 for connecting the guide shaft 9 and the drive rail 11 at one end close to the turntable 1. A notch 16 is formed in the central portion of the connecting plate 15, and projecting pieces 17a and 17b cut and raised are provided on both sides of the notch 16. The connecting plate 15 is attached to the chassis 2 at the connecting portion of the guide shaft 9 and the driving rail 11, and is attached to the chassis 2 by screws 18 and 19 inserted from the connecting plate 15 side.
Guide shaft 9 and drive rail 1
1 is fixed, so that the connecting plate 15, the guide shaft 9, and one end of the drive rail 11 are attached to the chassis 2 at the same time.

By the way, the screws 18 and 19 used for mounting the guide shaft 9 and the drive rail 11 are
An intermediate portion is formed between each of the head portion and the screw portion at the tip where the screw thread is formed, and the diameters are made different stepwise. FIG. 3 is a cross-sectional view on a straight line connecting AA ′ in FIG. 1 showing a state where the connecting plate 15, the guide shaft 9 and one end of the drive rail 11 are attached to the chassis 2. As shown in the drawing, in the direction orthogonal to the axis of the guide shaft 9, the mounting hole of the chassis 2 into which the screw 18 is inserted is formed larger than the diameter of the screw portion of the screw 18, while the screw 19 is inserted. The mounting hole of the chassis 2 is larger than the diameter of the middle portion of the screw 19. The screw 18 is screwed to the guide shaft 9 via the spacer 21 with the spring washer 20 interposed therebetween, while the screw 19 is interposed between the chassis 2 and the drive rail 11 due to the thickness of the intermediate portion. It is screwed onto the drive rail 11 in a state where a small clearance is formed. For that reason,
Even if the connecting plate 15 is screwed by the screws 18 and 19, the connecting plate 15 can be slightly displaced on the chassis 2 by the allowance provided in each mounting hole in the direction orthogonal to the axis of the guide shaft 9. .

Further, as shown in FIG. 1, the guide shaft 9 and the drive rail 11 have an intermediate portion similar to the screws 18 and 19 at a position near the end of the guide shaft 9 which is separated from the connecting portion by a substantially equal distance. Screws 22 and 23 having a shape
Are respectively attached to the chassis 2. Therefore, when the connecting plate 15 is slidably displaced in the direction orthogonal to the axis of the guide shaft 9, the guide shaft 9 and the drive rail 11 are rotated about the screws 22 and 23 as fulcrums.

By the way, the chassis 2 is provided with a through hole 24 so as to be arranged in the notch 16 of the connecting plate 15 when the connecting plate 15 is attached. The through hole 24 is used to support a jig 25 for displacing the connecting plate 15. The jig 25 has a cylindrical tip with a diameter that fits properly in the notch 16, and a pin 26 inserted into the through hole 24 is projected from the tip surface to an eccentric position.

When the jig 25 is inserted into the notch 16 while the pin 26 is inserted into the through hole 24, the tip of the jig 25 has protrusions 17a, 1a on its side surfaces as shown by the one-dot chain line in FIG.
It is in a state of being substantially in contact with 7b. Therefore, when the jig 25 is rotated, the jig 25 is rotationally displaced about the pin 26,
The projecting piece 17a and / or the projecting piece 17b is pressed by the tip side surface of the jig 25, and the connecting plate 15 can be slidably displaced in a direction perpendicular to the axial direction of the guide shaft 9.

Therefore, using the jig 25, the connecting plate 15
By slidingly displacing the guide shaft 9 and the drive rail 11, the guide shaft 9 and the drive rail 11 can be simultaneously rotated and displaced by the same amount.
Pickup 4 without changing the positional relationship with 1
It is possible to adjust the position of the guide shaft 9 for adjusting the trajectory traced by the disc in the normal direction of the disc.

Further, in the above-mentioned embodiment, the description has been given only to the lower side of the guide shaft 9 and the drive rail 11 on the lower chassis 2 side to which the spindle motor 3 is fixed, but it is not shown. The upper chassis side guide shaft 10 and the upper side of the drive rail 11 have the same configuration, and the upper side of the guide shaft 10 and the drive rail 11 can be simultaneously displaced by the same amount by the upper connecting plate. Therefore, the position of the guide shaft 10 is adjusted. In this case, the distortion caused by the position adjustment of the lower side and the upper side of the drive rail 11 independently is absorbed by the arc-shaped portion of the drive rail 11 due to the elasticity of the drive rail 11.

Further, since the driving force from the motor 6 of the pick-up 4 is not applied to the auxiliary rail 13, the auxiliary rail 13 can drive the pickup 4 without adjusting the position. It does not hinder.

[0021]

As described above, according to the present invention, since the guide shaft and the drive rail can be simultaneously rotationally displaced by the same amount, the positional relationship between the guide shaft and the drive rail is deviated. It is possible to adjust the position of the guide shaft to adjust the trajectory traced by the pickup in the normal direction of the disk without any need, and the pickup feed mechanism that prevents the pickup drive system from being hindered by the adjustment. Can be provided.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing an example of a feed mechanism of a self-propelled pickup according to the present invention.

FIG. 3 is a cross-sectional view on a straight line connecting AA ′ in FIG.

[Explanation of symbols]

2 chassis 4 pickup 6 motor 8 pinion gear 9,10 guide shaft 11 drive rail 12 rack 15 connecting plate 16 notch 17a, 17b projecting piece

Claims (1)

[Claims] 1. A pickup equipped with a driving motor and a pinion gear driven by the motor, and a guide shaft attached to a chassis for guiding the trace position trajectory by the pickup in the normal direction of the disk. And a rack that is arranged parallel to the guide shaft and that meshes with the pinion gear is formed,
A drive rail used to drive the pickup, and a connecting member for connecting the guide shaft and the drive rail at one end, the connecting member being displaceably attached to the chassis, and the guide The guide shaft is configured to rotatably support the shaft and the drive rail with respect to the chassis at positions separated from the connection point of the connection member by substantially the same distance, and by displacing the connection member. Also, a pickup feed mechanism is characterized in that the position of the pickup in the feed direction is adjusted by simultaneously rotating the drive rail.