JPH0528568Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention uses an optical pickup to collect digital signals of 0 and 1 recorded on a small diameter disk (standard diameter: 12 cm) while rotating the disk. One of the components of a digital audio disk (generally called a compact disk, hereinafter also referred to as a CD) player that can be taken out and played with high-quality sound without touching the disk. CD's
The components for sliding the disks through a servo mechanism following a track with a pitch of 1.6 μm are, in detail, parallel to each other or substantially parallel to each other along a straight line in the radial direction of rotation passing through the rotation axis of the compact disk rotation motor. This invention relates to an optical pickup slide guide device for a compact disc player, in which a pair of slide guide shafts are provided, and an optical pickup is installed and supported between the pair of slide guide shafts so that it can slide freely along the straight line in the rotational radial direction.

<Prior art> In a CD player, the pick-up is
It is necessary to configure the optical axis to slide along a straight line in the direction of the rotation radius passing through the rotation axis of the CD rotation motor, and for this purpose, the position of the slide guide shaft must be determined after assembly is completed. There is a need for a mechanism that can change and adjust the angle in the distance direction while remaining parallel to the straight line.

Conventionally, as this type of slide guide shaft position change adjustment mechanism, as shown in FIG. A shaft pressing fixing member 08, which can be repositioned and fixed in a direction perpendicular to the slide guide shaft axial direction via screws 06, 06, is attached to bracket members 04, 05 that fix and hold both ends of the shaft 02 in the axial direction.
08, and a spacer 0 is provided between the slide guide shaft 02 and the bracket members 04, 05.
9, 09 and press fixing members 08, 08
Although not shown, the slide guide shaft 02 is configured to be adjusted in position by the thickness of the spacers 09, 09.
A structure in which the position can be freely changed and adjusted through a plurality of screws is known.

<Problems to be solved by the invention> However, when using the conventional adjustment mechanism as described above, it requires a great deal of effort and time for adjustment in both cases, and has the disadvantage that it has a negative impact on the productivity of CD players. In particular, since there were variations in the adjustment allowance, it was necessary to stock and prepare a variety of spacers with different thicknesses, resulting in waste in terms of production.

<Means for Solving the Problems> In view of the above-mentioned circumstances, an object of the present invention is to provide an optical pickup slide guide device for a CD player that allows desired adjustments to be made with a very simple operation.

In order to achieve the above purpose, the present invention
In the optical pickup slide guide device for a CD player, as stated in the detailed description at the beginning, the shaft end holding members that hold both ends of the one slide guide shaft in the axial direction are both of the same length and kept parallel to each other. The base ends of these shafts are used as fulcrums R ₁ and R ₂ so that they can swing freely, and one end of the movable slide guide shaft in the axial direction is provided with a shaft that can be moved in and out in the axial direction of the slide guide shaft. adjustment screws are provided coaxially, and an elastic body is provided that urges the both shaft end holding members to swing in one direction so that one end surface in the axial direction of the slide guide shaft comes into elastic contact with the tip of the screw. It is characterized by its structure.

<Operation> The CD according to the present invention having such a characteristic structure
When using the player's optical pickup slide guide device, after all the constituent members have been assembled, the movable slide guide shaft and the two shaft end holding members located at both ends in the axial direction form a parallel quadruple link mechanism. In the configured state, by adjusting the adjustment screw in and out, the slide guide shaft is adjusted to move in the distance direction while remaining parallel to a straight line in the rotation radial direction passing through the rotation axis of the CD rotation motor. Thus, the optical axis of the optical pickup can be positioned on the straight line.

<Example> An example of the present invention will be described below in detail based on the drawings.

In the block diagram of the CD player shown in FIG. 3, numeral 1 is a spindle motor for rotating a compact disc CD, and its rotation is controlled via a rotation servo mechanism 1S. Reference numeral 3 denotes an optical pickup for reading digital signals recorded on the compact disc CD by moving along a rotational radial direction straight line a passing through the rotational axis of the spindle motor 1 on the back side of the compact disc CD. It is configured to follow a track with a pitch of 1.6 μm via a tracking servo mechanism 10S, and a lens (objective lens) and a disk (CD)
The optical pickup 3 is configured to move up and down as the disc (CD) rotates and moves up and down via a focusing servo mechanism 11S that maintains a constant distance from the signal surface of the optical pickup 3.

As shown in FIG. 2, the optical pickup 3 includes a pair of optical pickups arranged parallel to each other along the rotational radial direction a on both sides of the rotational radial direction straight line a passing through the rotational axis of the spindle motor 1. The tracking servo mechanism 10S extends between the slide shafts 2 and 2', with its optical axis 3a along the straight line a.
It is installed and supported in such a way that it can be slid freely through.

Of the pair of slide guide shafts 2, 2',
One slide guide shaft 2' is fixed in position at both ends in the axial direction, and shaft end holding members 4 and 5 that hold both ends in the axial direction of the other slide guide shaft 2 are clearly shown in FIG. Fixed mounting part 4 to the CD player body with the same length as shown in
It is integrally molded from polyacetal resin or epoxy resin in a series with A and 5A, and has inclination angles θ ₁ and θ ₂ of about 45 degrees with respect to the axis of the slide guide shaft 2 in the free state. I'm doing it,
When a pressing force is applied from one side of the axis of the slide guide shaft 2 (the right side in the drawing), the slide guide shaft 2 swings against elasticity using the base end portions R ₁ and R ₂ as fulcrums. It is elastically biased in the direction of inclination. The movable slide guide shaft 2 is connected to the outer side of one end in the axial direction of the slide guide shaft 2 through a female screw portion formed on a protruding piece 5a integrally formed with one shaft end holding member 5. An adjusting screw 6 that can be freely adjusted in and out is provided coaxially with the screw 6.
The tip end thereof is configured to come into elastic contact with one end surface 2a in the axial direction of the slide guide shaft 2 by the elastic rocking urging force of the shaft end holding members 4 and 5. Note that 12 in FIG. 3 is a digital signal processing circuit.

In the above embodiment, if the optical axis 3a of the optical pickup 3 is deviated downward in FIG. to press.
Then, one of the shaft end holding members 5 moves to its base end fulcrum.
It swings around R ₂ against its elasticity to push and move the slide guide shaft 2 upward in the diagram, and the moving force of this slide guide shaft 2 holds the other shaft end through the slide guide shaft 2. It is transmitted to the member 4, and this shaft end holding member 4 also has its base end fulcrum.
The slide guide shaft 2 swings against elasticity around R ₁ , and then the slide guide shaft 2 moves along a straight line a in the rotational radial direction passing through the rotational axis of the spindle motor 1, as shown by the dotted line in Figure 2.
, the optical axis 3a is positioned on the straight line a, and in this state, the slide guide shaft is The fixation is maintained by the elastic contact between one end surface 2a of the adjustment screw 2 and the tip of the adjustment screw 6.

FIG. 4 shows another embodiment in which both the shaft end holding members 4 and 5 are made of a rigid material, and the two shaft end holding members 4 and 5 are connected to fulcrum shafts 4B and 5B at their base ends. between one member 5 and the fixed mounting portion 5A, both members 4 and 5 are swingably biased in one direction, that is, on the side where the adjustment screw 6 is located. The optical axis 3a can be adjusted in position on the straight line a by adjusting the opening and closing of the 61 adjusting screws as in the above embodiment. The above embodiment is more desirable in terms of the number of parts and the associated assembly effort.

<Effects of the invention> As can be understood from the detailed description above, when the present invention is used, it is extremely easy to adjust the opening and closing of only one adjustment screw 6 after the assembly of the component parts is completed. By operating the optical axis 3a of the optical pickup 3,
By positioning the rotating motor 1 on a straight line in the rotational radius direction passing through the rotation axis of the rotating motor 1, adjustment work can be easily and quickly performed, thereby contributing to improving the productivity of the CD player.

Furthermore, there is no need to prepare wasteful members such as spacers, which is extremely advantageous in terms of cost.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention,
Fig. 1 is an enlarged perspective view of the main parts, Fig. 2 is a plan view of the main parts, Fig. 3 is a block diagram of the CD player, Fig. 4 is an enlarged plan view of the main parts showing another embodiment, and Fig. 5 is an enlarged perspective view of the main parts. The figure is an enlarged perspective view of main parts showing a conventional example. 1 is a CD rotation motor, 2 and 2' are slide guide shafts, 3 is an optical pickup, 4 and 5 are shaft end holding members, 6 is an adjustment screw, and 7 is a spring.

Claims (1)

[Claims for Utility Model Registration] A pair of slide guide shafts 2, parallel to each other or substantially parallel to each other along a straight line in the direction of the rotation radius passing through the rotation axis of the compact disk rotation motor 1;
2' is provided, and this pair of slide guide shafts 2,
In an optical pickup slide guide device for a compact disk player, an optical pickup 3 is installed and supported between 2' so that it can slide freely along the straight line in the rotational radial direction.
The shaft end holding members 4 and 5 that hold both ends of the one slide guide shaft 2 in the axial direction are both of the same length and in parallel positions, and their base ends are used as fulcrums R ₁ and R ₂ . The movable slide guide shaft 2 is configured to be able to freely swing and move, and an adjustment screw 6 that can be adjusted in and out in the axial direction of the slide guide shaft 2 is coaxially provided on the outside of one end in the axial direction of the movable slide guide shaft 2. Both shaft end holding members 4, 5
An optical pickup for a compact disc player, characterized in that an elastic body is provided for swinging and biasing in one direction so that one end surface 2a in the axial direction of the slide guide shaft 2 comes into elastic contact with the tip of the screw 6. Slide guide device. The apparatus according to claim 1, wherein the elastic body is also used as the shaft end holding members 4 and 5. The shaft end holding members 4 and 5 are made of a rigid material whose base ends are pivotably supported via fulcrum shafts 4B and 5B, and an elastic body that urges them to swing in one direction. The device according to claim 1, wherein the spring 7 is a spring 7.