JPH01106371A - CD player - Google Patents

Abstract

PURPOSE:To prevent chattering while pliding and backrush caused by a gap by meshing a rack-and-pinion deeper wherein either of them being held with elasticity and making an optical pick up force to contact with a guide rail centering around the guide shaft. CONSTITUTION:A rack gear 4 is formed capable of its elastic deformation by a synthetic resin and by making the state of the rack gear 4 being meshed to a pinion gear 5 with its slight elastic deformation the generation of the meshing gap between them is prevented, also, the driving system eliminating the chattering between an optical pickup 3 and guide rail 6 is owned by compos ing the meshing position thereof to the position where an elastic force exerts as an angular moment to the pinion gear 5 of the rack gear 4 in the direction the optical pickup 3 is energized in the guide rail 6 direction, centering around a guide shaft 2 against the optical pickup 3. Consequently the optical pickup 3 can be held and driven with good accuracy even in case of any variation in the position of a CD player.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a CD player.

(Prior Art) In general, CD (compact disc) players include:
Guide shafts are used to guide the movement of the optical pickup, and in order to ensure smooth movement, conventionally two expensive guide shafts have been polished with high precision.

On the other hand, in recent years, there has been a demand for CD players to be configured as composite devices with radio cassettes, etc.
A new player configuration has been desired.

In order to satisfy this, we decided to use the expensive guide shaft mentioned above.
Instead of a book, a guide rail made of composite molding or the like is used to hold the optical pickup.

FIG. 3 shows a cross-sectional view of a conventional CD player drive system that slides and guides an optical pickup using such a guide rail, in which 1 is an optical disk, 2 is a guide shaft, 3 is an optical pickup, and Optical disc 1 guided by shaft 2
A rack gear 4 moves in parallel to the plane of the optical pickup 3, and is engaged with a driving pinion gear 5, which is driven by a motor or the like (not shown).

6 is a guide rail made of resin or the like that supports the optical pickup 3 parallel to the optical disk 1 in cooperation with the guide shaft 2; 7 is a gear shaft of the pinion gear 5;

(Problems to be Solved by the Invention) Conventional CD players are constructed as described above, and therefore, the distance between the optical pickup 3 and the guide rail 6 is affected by the flatness of the guide rail 6, dimensional changes due to temperature, etc. , the optical pickup 3 had a high sliding load and was unable to move stably.

To remedy this problem, a gap is provided between the guide groove of the guide rail 6 and the inserted optical pickup 3, taking into account flatness and dimensional changes due to temperature.

However, the above-mentioned gap causes a change in the posture of the CD player when the optical pickup 3 slides, causing rattling in the sliding movement, causing the optical axis of the optical pickup 3 to move, and causing the disadvantage that the optical pickup 3 cannot be held accurately. It has occurred.

In view of the problems in the conventional CD player described above, the present invention solves the problem of the gap between the optical pickup 3 and the guide rail 6, and at the same time eliminates the problem of the gap between the rack gear 4 and the pinion gear 5.
To provide a CD player which prevents the occurrence of a gap (backlash) in engagement with the CD player and holds and drives an optical pickup 3 with high precision even if the posture of the CD player changes.

(Means for Solving the Problems) The present invention achieves the above object by providing an optical pickup guided by a guide shaft provided parallel to the signal surface of an optical disk, and an optical pickup that is held parallel to the signal surface of the optical disk. The optical pickup drive system includes a guide rail fixed to the optical pickup, a rack gear that is fixed to the optical pickup and moves together, and a pinion gear that meshes with this and is driven and rotated by a motor, etc., and the meshing of the rack gear and pinion gear is An elastic force is applied from either side in the direction of increasing depth, and at the same time, the elastic force acts on the optical pickup as a rotational moment about the guide shaft, so that the optical pickup is always pressed against the guide rail. Achieved as a CD player.

(Function) According to the present invention, even if the posture of the CD player changes, the optical pickup 3 is always biased in one direction toward the guide rail 6, and the rack gear 4 and pinion gear 5 are engaged with each other. Also, the backlash is gone and the optical pickup 3 is retained.

This results in better driving performance and improved earthquake resistance.

(Example) Hereinafter, the present invention will be explained in detail by way of an example using the drawings.

Fig. 1 is a cross-sectional view of the main driving part of an optical pickup in a CD player showing an embodiment of the present invention, and Fig. 2 is a front view thereof. In both figures, the same reference numerals as in Fig. 3 are used. , their functions are similar to the conventional example.

In such a configuration, the rack gear 4 in particular is molded from synthetic resin and has an elastic portion 4a that deforms in the direction of the center of rotation of the pinion gear 5, and its elastic force deepens the meshing with the pinion gear 5. (to eliminate gaps). Further, the meshing position of the rack gear 4 and pinion gear 5 is such that a rotational moment acts on the optical pickup 3 so as to bias the optical pickup 3 toward the guide rail 6 around the guide shaft 2.

The drive system of the optical pickup 3 of the CD player configured as described above is first driven by a motor (not shown), and the pinion gear 5 rotates at a reduced speed to drive the rack gear 4. Since the rack gear 4 is fixed to the optical pickup 3, the rotation of the pinion gear 5 drives the movement of the optical pickup 3.

At this time, when the rack gear 4 and pinion gear 5 engage, the rack gear 4 is pressed against the pinion gear 5 side by the elasticity of the resin, and therefore no gap is generated between the rack gear 4 and the pinion gear 5.

That is, backlash is eliminated and the direction of the guide shaft 2 of the optical pickup 3 is eliminated.

In addition, the elastic force of the rack gear 4 on the pinion gear 5 acts on the optical pickup 3 as a rotational moment about the guide shaft 2, and as a result, the optical pickup 3 becomes a force that urges the guide rail 6, causing the optical pickup 3 to This eliminates looseness between the pickup 3 and the guide rail 6.

As described above, in the present invention, the rack gear 4 is molded with synthetic resin so that it can be elastically deformed, and the rack gear 4 and pinion gear 5 are attached.

By setting the meshing state such that the rack gear 4 is slightly elastically deformed and meshing with the pinion gear 5, generation of a meshing gap between them is prevented, and the meshing position is set so that the guide shaft 2 is aligned with respect to the optical pickup 3. By configuring the center at a position where an elastic force acts as a rotational moment on the pinion gear 5 of the rack gear 4 in a direction in which the optical pickup 3 is urged toward the guide rail 6, the distance between the optical pickup 3 and the guide rail 6 is reduced. It has a drive system that eliminates play.

In the above embodiment, the rack gear 4 is elastically deformed, but the pinion gear 5 itself is configured to be movable toward the rack gear 4, and the pinion gear 5 is pressed against the rack gear 4 to prevent meshing rattling. A configuration may also be adopted in which the rotational moment of the optical pickup 3 is applied to bias the optical pickup 3 toward the guide rail 6.

(Effects of the Invention) As is clear from the above description, the present invention has the advantage that, due to the elasticity of either the rack gear or the pinion gear, a force is applied in the direction of deepening the meshing thereof, and at the same time, the elastic force is applied to the optical pickup. On the other hand, by meshing around the guide shaft at a position that acts as a rotational moment in the direction of urging the optical pickup against the guide rail, the optical pickup is always urged against the guide rail, and the gap between the optical pickup and the guide rail is This makes it possible to prevent sliding rattling caused by the optical pickup, as well as to prevent such backlash, thereby making it possible to hold and drive the optical pickup with high accuracy without rattling in all directions.

Therefore, it is highly effective to use it as a CD player that has the feeding accuracy of a low-cost optical pickup that saves on the guide shaft and has earthquake resistance.

[Brief explanation of the drawing]

FIGS. 1 and 2 are a sectional view and a front view, respectively, showing the main parts of the drive system of the optical pickup of the present invention in a CD player, and FIG. 3 is the same. 1... Optical disk, 2... Guide shaft, 3...
・Optical pickup, 4...Rack gear. 5... Pinion gear, 6... Guide rail, 7
...Gear shaft. Fig. 1 1..."Iff system 5°°° ignition surprise machine 2...force idle shaft 6...is idle relay 3...
・・Maruhikkuatsua 7・・ Arrow phase 4
...Rack master Figure 2 Figure 3

Claims (1)

[Claims] In a CD player, an optical pickup is guided by a guide shaft provided parallel to the signal surface of the optical disk, a guide rail holds the optical pickup parallel to the signal surface of the optical disk, and the optical pickup is fixed to the optical pickup and moves in unison with the optical pickup. The optical pickup has a drive system consisting of a rack gear and a pinion gear that meshes with the rack gear and is driven and rotated by a motor or the like. A CD player characterized in that the optical pickup is always brought into pressure contact with the guide rail by causing the elastic force to act on the optical pickup as a rotational moment about the guide shaft at the same time.