JPH0544928Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical head that is incorporated into, for example, a compact disc player or a laser disc player.

(Prior Art) As an example of this type of optical head, there is an optical head such as a compact disk player shown in FIG. 4, for example. In the figure, 1 is the optical head main body, 1a
2 is an objective lens through which the laser beam enters and exits; 2 is a linear guide shaft that accurately linearly guides the optical head body 1 in the radial direction of the information disk (not shown); 3 is an optical head disposed parallel to the linear guide shaft 2; This is a rotation stopper guide shaft that stops the rotation of the main body 1, and the side surface of the optical head main body 1 is provided with a through hole 4 into which the linear guide shaft 2 is inserted and a through hole 5 into which the rotation stop guide shaft 3 is loosely fitted. It is set up. Of these through holes 4 and 5,
The through hole 4 is shaped so that there is almost no space between it and the linear guide shaft 2 as far as possible from the viewpoint of its function. On the other hand, the shape of the through hole 5 has an inner diameter considerably larger than the outer diameter of the rotation stopper guide shaft 3, as shown in FIG. If the rotation stopper guide shaft 3 is fitted loosely as shown in FIG.

In addition, in the case of this type of optical head, its drive is as follows.
For example, this is carried out by a drive device consisting of a rail-shaped rack (not shown) attached to the lower surface of the optical head main body 1 and a pinion gear (not shown) driven by a motor.

(Problem to be solved by the invention) In the optical head as described above, as described above, the linear guide shaft 2 and the rotation stopper guide shaft 3 are connected to each other.
The shape of the through hole 5 that absorbs the parallel deviation is circular or elongated, and in the case of the former circular shape, there is also a gap in the vertical direction of the through hole 5 into which the rotation stopper guide shaft 3 is loosely fitted. Therefore, there is a possibility that the optical head main body 1 may wobble. On the other hand, in the case of an elongated hole shape, there is almost no gap in the vertical direction of the through hole 5 into which the rotation stopper guide shaft 3 is loosely fitted, so the optical head main body 1 does not wobble, but since it is an elongated hole shape, it is circular. The problem is that it is difficult to process compared to its shape.

In addition, in order to solve this problem, some devices do not loosely fit the rotation stop guide shaft into the through hole, but instead use a spring member to bias the optical head body toward the rotation stop shaft. When a large excitation force that cannot be absorbed by the elastic deformation of the spring member is applied to the optical head main body, another problem arises in that the spring member undergoes plastic deformation and is damaged.

The present invention has been devised in view of these problems, and its purpose is to realize an optical head that is less prone to rattling and that is easy to process.

Another object of the present invention is to provide the optical head body with:
An object of the present invention is to realize an optical head in which a spring member is not damaged even when a large excitation force is applied.

(Means for Solving the Problems) The present invention for solving the above problems includes an optical head body having at least one of the functions of reading recorded information on an information disk and writing information on the information disk. , a linear guide shaft for linearly feeding the optical head main body in the radial direction of the information disk and a rotation stopper guide shaft, a base end of which is attached to the optical head main body, and a distal end of the optical head of the rotation stopper guide shaft. An optical head comprising a spring member that presses a portion opposite to the main body to urge the optical head main body toward the rotation stopper guide shaft,
The base end portion is mounted on the optical head main body, and the distal end portion is provided with a stopper that faces the side of the rotation stopper shaft where the spring member is pressed, with a gap in between.

(Function) In the optical head of the present invention, the spring member attached to the optical head main body always urges the optical head main body toward the rotation stopper guide shaft, so that the optical head main body does not wobble. or,
Parallel misalignment between the rotation stopper guide shaft and the linear guide shaft is absorbed.

Furthermore, even if a large excitation force is applied to the optical head body, the tip of the stopper comes into contact with the rotation stopper shaft, which prevents the optical head body from moving away from the rotation stopper shaft excessively, preventing damage to the spring member. does not occur.

(Example) Hereinafter, an example of the present invention will be described in detail using FIG. 1 and FIG. 2. In these figures, the same parts as in the prior art example described above are given the same reference numerals.
In the figure, reference numeral 6 denotes a substantially horizontal U-shaped spring member that is attached to the upper surface of the optical head body 1 and biases the optical head body 1 toward the rotation stopper guide shaft 3 side.
This spring member 6 is adapted to press the rotation stopper guide shaft 3 from above at the bent upper portion. A through hole 7 into which the anti-rotation guide shaft 3 is loosely fitted is bored in the rising part, and its shape is such that when the anti-rotation guide shaft 3 is loosely fitted, there is a gap at least in the direction parallel to the information disk. It has a shape. The upper and lower inner surfaces of the spring member 6 come into sliding contact with the anti-rotation guide shaft 3 when the optical head main body 1 slides, so anti-friction treatments such as PTFE (tetrafluoroethylene resin) lining or application of grease are applied to these surfaces. It is preferable to do this. Numeral 8 denotes a stepped flat stopper which is attached to the optical head main body 1 in the same way as the spring member 6. Its lower part is fixed to the optical head main body 1, and the upper part 8a is slightly bent above the rotation stopper guide shaft 3. The side part 8b is located between the rotation stopper guide shaft 3
is parallel to.

In the above configuration, the optical head main body 1
When the optical head body 1 is fed linearly in the radial direction of the information disk, even if there is a parallel deviation between the linear guide shaft 2 and the rotation stopper guide shaft 3, the optical head main body 1
Since the rotation stopper guide shaft 3 can be displaced relative to the rotation stopper in both the vertical and lateral directions, this parallel deviation is easily absorbed. Furthermore, even if an excitation force is applied to the optical head main body 1, the optical head main body 1 is always elastically biased toward the rotation stopper guide shaft 3 by the spring member 6, so that no wobbling occurs. .

Furthermore, in the case of this embodiment, even if a large excitation force that cannot be absorbed by the elastic deformation of the spring member 6 is applied to the optical head main body 1, the deformation of the spring member 6 will not occur.
Since this is limited to the range where the stopper 8 and the rotation stopper guide shaft 3 come into contact with each other, it is possible to avoid a situation where the spring member 6 is damaged.

As described above, the through hole 7 formed in the spring member 6 needs only to have a shape that allows space at least in the horizontal direction when the rotation stopper guide shaft 3 is inserted, so it is easy to process. be.

Note that the present invention is not limited to the above embodiments.
For example, the spring member 6 shown has a through hole 7, but as shown in FIG. Then, the rotation stopper guide shaft 3 and the upper surface of the optical head main body 1 may be pressed against each other.

(Effects of the invention) As explained above, in the optical head of the invention, the spring member attached to the optical head body is used to bias the optical head body toward the rotation stopper guide shaft. Shakiness of the main body can be absorbed by the elastic force of the spring member, and parallel misalignment between the rotation stopper guide shaft and the linear guide shaft can also be absorbed. Moreover, since only a spring member is used, processing is easy.

In addition, by providing the stopper, even if a large excitation force is applied to the optical head body, the tip of the stopper will come into contact with the rotation stopper shaft.
The optical head body is prevented from separating excessively from the rotation stopper shaft, and damage to the spring member does not occur.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figures are an enlarged perspective view of the area around the rotation stopper guide shaft in Fig. 1, Fig. 3 is a perspective view showing another embodiment, Fig. 4 is a perspective view showing a conventional embodiment, and Fig. 5 is a perspective view showing the area around the rotation stopper guide shaft. It is an enlarged view of the through hole in the figure. 1...Optical head main body, 1a...Objective lens,
2... Linear guide shaft, 3... Rotation stopper guide shaft, 4, 5, 7... Through hole, 6... Spring member, 8... Stopper, 8a... Stopper upper part, 8b... Stopper side part.

Claims (1)

[Claims for Utility Model Registration] An optical head main body having at least one of the functions of reading recorded information on an information disk and writing information onto the information disk, and an optical head main body arranged in a radial direction of the information disk. a linear guide shaft and a rotation stop guide shaft for linearly feeding the optical head, the proximal end of which is attached to the optical head main body, and the distal end of the rotation stop shaft pressed against a portion of the rotation stop shaft opposite to the optical head main body facing part; and a spring member for biasing the optical head main body toward the rotation stopper guide shaft, the proximal end being mounted on the optical head main body,
An optical head characterized in that a distal end portion is provided with a stopper that faces the pressing portion of the spring member of the rotation stopper guide shaft with a gap in between.