JPH039182Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an information recording disc player, and more particularly to a disc player that plays a digital audio disc (hereinafter abbreviated as DAD) on which PCM signals are recorded.

BACKGROUND ART Disc players that play DAD are, for example, so-called optical type disc players that irradiate a signal hole (pit) recorded on the DAD with a laser beam and read the signal by detecting changes in reflected light depending on the presence or absence of the signal hole. There is a signal detection method. 1 to 3 show the main parts of a conventional optical signal detection type disc player.

As shown in the figure, a worm 2 is rotatably held by a chassis 1 that is part of a support mechanism provided within a player housing. The screw shaft is rotationally driven by a drive source 3 including a drive motor (not shown). Warm 2
A pair of guide shafts 4 are arranged parallel to the guide shafts 1 and are attached to the chassis 1 at both ends thereof. These guide shafts 4 slidably support a carriage 5 carrying an optical pickup means (not shown) including a laser beam irradiation device. A half nut 6 serving as an engaging member that is screwed onto the worm 2 is arranged on the carriage 5. This half nut 6 is provided to extend substantially perpendicularly to the screw shaft 2, and has one end fixed to the carriage 5 and is fixed to the other end, that is, the free end, of a spring member 7 made of spring steel. The screw shaft 2 is biased toward the screw shaft 2 by the spring member.

The worm 2, drive source 3, guide shaft 4, half nut 6, spring member 7, and peripheral small members related to these constitute a guide drive means for guiding and driving the carriage 5. ing. The DAD 8 to be played is rotated by a spindle motor 9 fixedly mounted on the chassis 1.

In a disk player having such a configuration, the carriage 5 is driven via the spring member 7 and the half nut 6 by rotating the worm 2 in the forward and reverse directions. When the frequency reaches a certain value or its vicinity, the spring member 7 may resonate. When such a resonance phenomenon occurs, the threaded state between the half nut 6 fixed to the spring member 7 and the worm 2 becomes unstable, and therefore,
It happens that the carriage 5 moves in a chirping motion within the gap existing between it and the guide shaft 4. As a result, so-called focus servo and tracking servo cannot be performed smoothly. Note that the focus servo and tracking servo are well known and will not be described in detail here.

In order to solve the above-mentioned problems, a proposal was made to form the spring member that supports the half nut from a resin with a large internal loss, and to release the energy that causes resonance in the spring member as thermal energy when the spring member is deformed. However, it was found that the durability and temperature characteristics of spring members made of resin molding were extremely inferior to those made of spring steel, and that they were not suitable for practical use.

Summary of the invention The present invention has been made in view of the above points, and its purpose is to provide stable running of the carriage carrying the optical pickup means, and to improve the stability of the focus servo and tracking servo. An object of the present invention is to provide an information recording disc player that can smoothly perform the following steps.

An information recording disc player according to the present invention includes a support mechanism, a guide drive means provided on the support mechanism, and a carriage carrying an optical pickup means and guided and driven by the guide drive means, The guide drive means includes a worm rotatably held by the support mechanism, a drive source for rotationally driving the worm, a guide shaft arranged parallel to the worm and slidably supporting the carriage, and a guide shaft for supporting the carriage in a slidable manner. It has a spring member fixed at one end, and an engaging member fixed at the other end of the spring member and meshing with the worm, and a braking member is fixed to the spring member via a viscoelastic member. It is characterized by the presence of

Embodiment Hereinafter, the main parts of a disk player which is an embodiment of the present invention will be explained based on FIGS. 4 and 5.

As shown in the figure, a spring member 11 is fixed at one end at a predetermined position on the upper surface of a carriage 5 that supports an optical pickup means (not shown) including a laser beam irradiation device. This spring member 11
is made by bending a spring steel or the like formed into a rectangular plate shape so that the cross section becomes a gentle S-shape, the longitudinal direction of which intersects approximately perpendicular to the axial direction of the worm 2. It is set up like this. The other end of the spring member 11, that is, the free end is connected to the carriage 5.
A half nut 6 that is screwed onto the worm 2 is fixed to the lower surface of the free end. The half nut 6 is urged toward the worm 2 by the spring member 11, and therefore the worm 2 and the half nut 6 are screwed together very tightly. A plate-shaped braking member 13 is fixed to the main surface of the spring member 11 that is not opposed to the worm 2 via a viscoelastic member 12 . In other words, when the spring member 11 is deflected in a direction substantially perpendicular to its main surface, the viscoelastic member 12 undergoes shearing deformation between the spring member and the plate-like braking member 13. . The viscoelastic member 12 is a highly efficient material that converts the energy that causes the viscoelastic member to deform into thermal energy and releases it directly into the air or into the carriage 5 via the spring member 11, that is, an internal loss material. Highly efficient products are used. Further, as the material of the plate-shaped braking member 13, for example, a thin plate-shaped material such as an aluminum alloy is used.

The same reference numerals are used for parts that are the same as or correspond to those of the information recording disc player shown in Figs. 1 to 3, and parts other than the above are the same as those shown in Figs. 1 to 3. The structure is exactly the same as that of an information recording disc player, so a detailed description thereof will not be given.

In the information recording disk player configured as described above, the viscoelastic member 12 causes shear strain as the spring member 11 resonates, and the energy that causes the spring member 11 to resonate is released as thermal energy.

In addition, in this embodiment, the spring member 11, the viscoelastic member 12, and the plate-like braking member 13 are arranged to intersect the worm 2 at approximately right angles;
The configuration is not limited to this, and these members may be provided parallel to the worm 2 to support it, as shown in FIG.

Effects As detailed above, in the information recording disk player according to the present invention, the cantilever-shaped spring member that supports the meshing member at its free end is provided with vibration absorbing means consisting of a viscoelastic member and a damping member. . Therefore, the resonance of the spring member is suppressed and the carriage runs stably, so that the focus servo and tracking servo become smooth. Furthermore, since the spring member is made of resin and has sufficient durability, it takes a very long time before deterioration occurs over time.

[Brief explanation of the drawing]

1 to 3 are diagrams showing the main parts of a conventional information recording disc player, FIGS. 4 and 5 are diagrams showing the main parts of the information recording disc player according to the present invention, and FIG. 6 is a diagram showing the main parts of the information recording disc player according to the present invention. FIG. 7 is a diagram illustrating a partially modified example of a recording disc player. Explanation of the symbols of the main parts, 2...Warm, 3...
... Drive source, 4 ... Guide shaft, 5 ... Carriage, 6 ... Half nut, 11 ... Spring member,
12... Viscoelastic member, 13... Braking member.

Claims (1)

[Scope of utility model registration request] a support mechanism, a guide and drive means provided on the support mechanism, and a carriage carrying an optical pickup means and guided and driven by the guide and drive means, the guide and drive means being attached to the support mechanism. A worm rotatably held, a drive source for rotationally driving the worm, a guide shaft arranged parallel to the worm and slidably supporting the carriage, and a spring fixed at one end to the carriage. and an engaging member fixed to the other end of the spring member and meshing with the worm, and a braking member is fixed to the spring member via a viscoelastic member. Recording disc player.