JPH0329771Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a disc player that plays back information recorded on the recording surface of a compact disc or the like, and in particular, the invention relates to a disc player that plays back information recorded on a recording surface of a compact disc, etc., and in particular, the inclination angle of one side of a slider on which a pick-up is mounted is adjusted with respect to the chassis. This invention relates to a pickup adjustment device for a freely supported disk player.

[Technical Background] An optical pickup is a device that reads information recorded on the recording surface of a disk in a non-contact manner. This optical pickup reproduces information by irradiating the recording surface with a laser beam and detecting the reflected light.

In order for an optical pickup to read accurately, the optical axis of the laser beam must be irradiated onto the recording surface at a precise angle.

[Prior art and its problems]

As shown in FIG. 7 (side view), the optical pickup 4 is mounted on a slider 5. On both sides of this slider 5 are guide shafts 6a and 6b.
It is slidably supported. The guide shafts 6a and 6b are fixed to a chassis (not shown). Further, a spindle motor 1 is fixedly installed on this chassis. A disk 3 is mounted on a turntable 2 attached to the tip of this spindle motor 1.
is set. Optical pick-up 4 above
The objective lens 4b is used to detect the recording surface 3 of this disk 3.
b, and are opposed to each other with a predetermined distance therebetween. The laser beam is emitted from this objective lens 4b.

In this disk player, the optical axis angle of the objective lens 4b directed toward the recording surface 3b is determined by the parallelism of the guide shafts 6a and 6b fixed on the chassis, the inclination angle of the spindle motor 1 with respect to the chassis, etc. be done. Therefore, due to distortion of the guide shafts 6a and 6b and the spindle motor 1 with respect to the chassis, or an assembly error, the optical axis angle of the objective lens 4b with respect to the recording surface 3b will be slightly inclined. In order to eliminate this inclination angle θ of the optical axis during assembly, it is necessary to increase the processing precision of each component and to adjust the position during assembly, which makes the work inefficient.

To deal with this, the optical pickup 4 is movably attached to the slider 5, and after assembly,
There is also a means of adjusting the optical axis by swinging only the optical pickup 4. However, in that case, a movable member must be interposed between the slider 5 and the optical pickup 4, making the structure complicated. Moreover, the overall size of the device becomes large, going against the recent trend of miniaturization and thinning.

[Purpose of this invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and it is a disk that allows the angle of the optical axis to be adjusted easily and accurately, and that also has a simple structure that allows for the miniaturization and thinning of devices. The object of the present invention is to provide a pickup adjustment device for a player.

[Structure of the present invention]

The pick-up adjustment device according to the present invention includes a chassis that includes a motor for rotationally driving a disk, a slider that moves in a direction across a track along the recording surface of the disk, and a slider that faces the recording surface of the disk placed on the slider. In a disk player equipped with a pick-up, one side of the slider is slidably supported by a guide shaft provided on the chassis, and the other side of the slider is provided with a rotatable support shaft. A pin is eccentrically protruded from the tip of the support shaft, teeth are formed around the support shaft, and a screw-shaped rotation adjustment member that engages with the teeth is screwed onto the slider. The pin is slidably supported on a rail provided on the chassis, and by rotating the rotation adjustment member, the teeth that engage with the rotation adjustment member rotate the support shaft. A pin installed on the shaft moves up and down within the rail to tilt the slider,
The optical axis angle of the pickup with respect to the disk is corrected.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 6.

Fig. 1 is an exploded perspective view of part A in Fig. 6, Fig. 2 is a sectional view of the same, Fig. 3 is a sectional view of the front, Fig. 4 is a sectional view of the same, and Fig. 5 is a plan view of the disk player. , FIG. 6 is a right side view of the disk player.

Reference numeral 7a in the figure is a chassis. A spindle motor 1 is fixed to the chassis 7a, and a turntable 2 is mounted on the upper part of the spindle motor 1. A compact disc 3 is set on this turntable 2.

A large square hole 7b is bored in the chassis 7a next to the turntable 2. This square hole 7b
A slider 10 is faced. A holder 10a is provided on one side of the slider 10. A metal bush 11 is press-fitted into this holder 10a, and this metal bush 11 is slidably inserted into the guide shaft 6.

Both ends of this guide shaft 6 are connected to the above-mentioned chassis 7.
It is supported by a bracket 7c provided at a. The slider 10 is guided by the guide shaft 6 and reciprocates from the lead-in zone to the lead-out zone 3a of the compact disc 3 in a direction across the track with the guide shaft 6 as a reference.

As shown in FIG. 1, a hole 10b having a predetermined depth is bored from the side on the other side of the slider 10.
A fan-shaped groove 10c is formed on the right side of the hole 10b in the drawing.

A support shaft 25 is rotatably mounted in this hole 10b. A sliding plate 26 with a low coefficient of friction is interposed between the bottom of the support shaft 25 and the bottom of the hole 10b. Furthermore, two teeth 27 are formed on one side of the outer circumference of the support shaft 25. This tooth 27 is the groove 10
It is loosely inserted into c. Further, a pin 28 is eccentrically protruded from the tip of the support shaft 25.

A screw hole 10d is screwed into the bottom surface of the slider 10. This screw hole 10d is the groove 10c.
The rotation adjustment member 29 in the form of a male screw is screwed into this screw hole 10d. The threaded portion 29a of the rotation adjustment member 29 is engaged with the teeth 27 of the support shaft 25.

The pin 28 of the support shaft 25 is slidably fitted into a slide groove 7e of a rail 7d formed in the chassis 7a. This slide groove 7e is coated with a low friction coefficient material such as fluororesin. Note that this slide groove 7e and the guide shaft 6
are arranged parallel to each other.

Both ends of a feed screw 14 arranged parallel to the guide shaft 6 are pivotally supported on the bracket 7c. A screw receiving member 15 is engaged with a threaded portion 14a formed on the feed screw 14. This screw receiving member 15 is connected to the side surface of the slider 10 via a pressure spring 16. Further, a pulley 17 is mounted on the tip of the feed screw 14. Another pulley 18 is connected to this pulley 17 via a belt 20. The other pulley 18 is mounted on a feed motor 19 fixed to the chassis 7a.

An optical pickup 4 is mounted on the slider 10. A lens barrel 4a is provided projecting from the top of the optical pickup 4. An objective lens 4b is built into the lens barrel 4a, and the objective lens 4b faces the recording surface 3b of the compact disc 3 (see FIG. 6) at a set interval.

As shown in FIG. 2, a laser diode 30 is installed on one side of the optical pickup 4. As shown in FIG. This laser diode 30 and the objective lens 4b include a diffraction grating 31 and a beam splitter 3.
2. Optical continuity is provided via a 1/4 wavelength plate (not shown) or the like. In addition, the beam splitter 32
On the other hand, a cylindrical lens 33 is provided in the 90 direction. This cylindrical lens 33
A photodiode faces the tip.

Next, the optical axis angle adjustment of the optical pickup 4 with respect to the compact disc 3 will be explained.

This optical axis adjustment is performed after the slider 10 is assembled to the chassis 7a.

First, a monitor is placed in front of the cylindrical lens 33. Next, a laser beam is emitted from the laser diode 30. This laser beam is transmitted from the objective lens 4b to the compact disk 3.
is irradiated onto the recording surface 3b.

For example, when the parallelism between the guide shaft 6 and the rail 7d is slightly off, or when the spindle motor 1 is installed with a slight inclination to the chassis 7a, the laser emitted from the objective lens 4b The optical axis of the beam is inclined with respect to the recording surface 3b. This angle of inclination θ is caused by assembly errors between the individual parts and is therefore an extremely small value.

When the rotation adjustment member 29 is slightly rotated with a screwdriver or the like, the threaded portion 29a formed on the rotation adjustment member 29 presses the teeth 27 in the vertical direction, causing the support shaft 25 to move slightly. At this time, since the sliding plate 26 is interposed between the bottom surface of the support shaft 25 and the bottom of the hole 10b, the support shaft 25 rotates smoothly. When the support shaft 25 moves slightly, the pin 28 fitted in the slide groove 7e of the rail 7d simultaneously swings. Since this pin 28 is eccentrically provided at the tip of the support shaft 25, the entire slider 10 slightly moves up and down about the guide shaft 6 as the pin 28 swings.

During this time, the deviation angle θ is corrected while observing the reflected beam from the recording surface 3b on a monitor. Then, when the optical axis has been properly corrected, the rotation adjustment member 29 is fixed with adhesive, and the adjustment of the optical axis angle is completed.

Next, the operation of the disc player with the above configuration will be explained.

The slider 10 in its initial state is at the position indicated by the dashed line in FIG. At this time, the objective lens 4b of the optical pickup 4 faces the lead-in zone of the compact disc 3.

In the reproduction operation, first, the spindle motor 1 is driven, and the compact disc 3 set on the turntable 2 is rotated. At the same time, the feed motor 19 rotates in synchronization with the spindle motor 1. The driving force of this feed motor 19 is applied to the feed screw 1 via a pulley 18, a belt 20, and another pulley 17.
4. The rotational force of the feed screw 14 is transmitted to the slider 10 via the screw receiving member 15. Due to this driving force, the slider 10 is supported by the guide shaft 6 and the pin 28 of the support shaft 25 fitted in the slide groove 7e of the rail 7d, and moves toward the lead-out zone 3a of the compact disc 3. At this time, the slider 10 moves with the guide shaft 6 as a reference. On the other hand, since the slide groove 7e is coated with a low friction coefficient member, the sliding resistance of the pin 28 is small, and the slider 10 slides smoothly.

During this time, the optical pickup 4 reproduces the information recorded on the recording surface 3b of the compact disc 3, and when the objective lens 4b reaches the read-out zone 3a of the compact disc 3,
The playback operation ends.

In the illustrated embodiment, the teeth 27 are attached to the support shaft 2.
Only two peaks are formed in the recovery of tooth 5, but this tooth 2
7 may be formed around the entire circumference of the support shaft 25. Further, a hook portion may be formed on both of the slider 10 so that when the support shaft 25 is assembled into the hole 10b of the slider 10, the support shaft 25 is positioned to a certain extent.

[Effects of this invention]

As described above, according to the present invention, the following effects can be achieved.

(1) One side of the slider on which the pick-up is mounted is slidably supported by a guide shaft provided on the chassis, and a support shaft is provided on the other side of the slider. Since the protruding pin is slidably supported on the rail provided on the chassis, it is more compact than the conventional system in which both sides are supported by guide shafts, and the entire device can be made smaller and thinner. realizable.

(2) Also, this support shaft is rotatable with respect to the slider, and the pin is eccentrically protruded from the tip of this support shaft, so it is possible to rotate this support shaft. , the slider swings in the vertical direction. Therefore, the optical axis of the pickup relative to the disk can be easily corrected after assembly.

(3) Furthermore, teeth are formed around the support shaft, and a rotation adjustment member that engages with the teeth is screwed onto the slider, so when the rotation adjustment member is rotated, the support shaft slightly moves. Optical axis adjustment can be performed extremely easily.

(4) Also, because of its simple structure, it is easy to manufacture and assemble. Moreover, since the optical axis adjustment is performed after the slider is assembled to the chassis, work efficiency is improved.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention. FIG. 1 is an exploded perspective view of part A in FIG. 6, FIG. 2 is a sectional view of the same plane, and FIG. 3 is a front sectional view of the same , FIG. 4 is a side sectional view of the same, FIG. 5 is a plan view of the disk player, FIG. 6 is a right side view of the disk player, and FIG. 7 is a side view of essential parts of a conventional disk player. 1... Motor, 3... Disk, 3b... Recording surface, 4... Pickup, 6... Guide shaft, 7a... Chassis, 7d... Rail, 10...
...Slider, 25...Spindle, 27...Teeth, 28...
...Pin, 29...Rotation adjustment member.

Claims (1)

[Scope of utility model registration request] A disk in which a chassis is provided with a motor for driving the disk, a slider that moves in a direction across the track along the recording surface of the disk, and a pick-up that faces the recording surface of the disk placed on the slider. In the player, one side of the slider is slidably supported by a guide shaft provided on the chassis, and a rotatable support shaft is provided on the other side of the slider, and the tip of this support shaft is provided on the other side of the slider. A pin is eccentrically protruded from the slider, and the slider is equipped with a rotation adjustment member that has teeth formed around the spindle and engages with the teeth to rotate the spindle. A pickup adjustment device for a disk player, wherein the pin is slidably supported by a rail provided on the chassis.