JP3304259B2 - Recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording / reproducing apparatus capable of recording, reproducing, and erasing information on a recording medium.

[0002]

2. Description of the Related Art Here, an optical disk device will be described as an example of a recording / reproducing device. FIG. 5 is a schematic diagram showing a configuration of a conventional optical disk device. FIG. 5A is a plan view, and FIG. 5B is a sectional view taken along line EE ′.

Tracks are formed on an optical disc 1 in a concentric or spiral manner.
Thus, information is recorded, reproduced, and erased on the track.

The optical pickup 2 is driven in the radial direction of the optical disk 1 along guide shafts 41 and 42 fixed to the base 3 so as to access a desired track for recording, reproducing and erasing information. Has become. In the conventional example shown in FIG. 5, the two guide shafts 41 and 42 are set in parallel with each other. However, the optical pickup 2 may be allowed to be non-parallel due to the processing accuracy of the guide shaft fixing portion. The portion that fits with the guide shaft 42 is a U-shaped groove 6 so that the deviation of the guide shaft can be corrected. On the other hand, portions fitted with the guide shaft 41 on the reference side are circular holes 51 and 52. The groove 6 has surfaces 6 a and 6 b parallel to a plane formed by the two guide shafts 41 and 42, thereby defining the height direction of the optical pickup 2.

The optical pickup 2 has a nut portion 8 screwed with a feed screw 7, and is moved in the radial direction of the optical disc 1 by the rotation of the feed screw 7 by a DC feed motor 9. The guide shafts 41 and 42 are provided for the optical pickup 2
In order to obtain straightness when moving, the machining accuracy must be increased, and for this reason, a member having a diameter as large as possible is adopted.

[0006]

In recent years, there has been a demand for a smaller and thinner recording / reproducing apparatus, and accordingly, a thinner guide mechanism has naturally been required. However, in the above-described conventional method of securing the straightness of the guide shaft by the processing accuracy of the shaft, the diameter of the guide shaft needs to be a certain thickness or more, and there has been a limit in reducing the thickness of the recording and reproducing apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a recording / reproducing apparatus capable of realizing miniaturization and thinning.

[0008]

SUMMARY OF THE INVENTION The present invention provides an optical pickup for recording, reproducing or erasing information on a recording medium,
In a recording / reproducing apparatus having a pickup driving means for moving the optical pickup along a guide shaft fixed to a base, a tension applying means for applying a tension to the guide shaft is provided.

The tension applying means is an elastic member connected to at least one end of the guide shaft.

Furthermore, the tension applying means is formed integrally with the base.

The operation of the present invention having such a configuration will be described below.

In the recording / reproducing apparatus according to the present invention, the recording / reproducing apparatus moves along a tensioned guide shaft. Since the guide shaft is given tension, even if its thickness is as thin as a string,
Straightness can be ensured. For this reason, it is possible to reduce the size of the recording / reproducing apparatus by making the guide shaft thin. Further, since high precision is not required for processing the guide shaft, cost reduction can be realized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings, taking as an example the case where the recording / reproducing apparatus of the present invention is applied to an optical disk device.

FIG. 1 is a schematic diagram showing a configuration example of an optical disk device of the present invention. FIG. 1A is a plan view, and FIG.
Fig. 1 is a view in the direction of the arrow X, and Fig. 1 (c) is a sectional view along AA '. Here, the same parts as those of the optical disk device shown in FIG. 5 are denoted by the same reference numerals.

In FIG. 1, the optical pickup 2 can move along guide shafts 10a and 10b to be described later. When recording, reproducing, or erasing information on the optical disc 1, an instruction is received from a control unit (not shown), the disc is moved in the radial direction of the optical disc 1 along the guide shafts 10a and 10b, and a desired track is accessed. Then, information is recorded, reproduced, and erased.

The optical pickup 2 has a nut portion 8 screwed with a feed screw 7 and is moved in the radial direction of the optical disc 1 by the rotation of the feed screw 7 by a DC feed motor 9. Circular holes 51 and 52 are formed in a portion of the optical pickup 2 to be fitted with the guide shaft 10a, and the above-described movement in the radial direction is performed with reference to the guide shaft 10a. A U-shaped groove 6 is formed at a portion where the guide shaft 10b of the optical pickup is fitted.
Thus, when the guide shaft 10a and the guide shaft 10b are not purely parallel, the deviation can be corrected. The groove 6 has surfaces 6 a and 6 b parallel to a plane formed by the two guide shafts 41 and 42 for defining the height direction of the optical pickup 2.

The guide shafts 10a and 10b are thin like a string, and one end is fixed to points 30a and 30b on the base 3. The base 3 is provided with guide positioning projections 31a, 31b and 32a, 32b having V-shaped grooves. The guide shafts 10a and 10b are
They are connected to tension springs 11a and 11b via 1a, 31b, 32a and 32b. Tension spring 11
a, 11b are fixed to points 33a, 33b on the base 3.

According to such a configuration, the guide shaft 10
Since a and 10b are tensioned by the tension springs 11a and 11b, the guide positioning projections 31a and 3b
It is linear between 31a and 32b during 2a,
Straightness, which is a basic characteristic of the guide shaft, can be secured. As the material of the guide shafts 10a and 10b, a material having a smooth surface such as a piano wire or a nylon string of a stringed instrument is preferable.

Further, since the guide shafts 10a and 10b do not need to be thick in order to have straightness as shown in FIG. 5, the optical disk device can be made thin.

FIG. 2 is a schematic diagram showing another configuration of the optical disk device shown in FIG. FIG. 2A is a plan view and FIG.
FIG. 2B is a view taken in the direction of the arrow X, and FIG. 2C is a sectional view taken along the line BB ′. In FIG. 2, the same portions as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The guide shafts 10a and 10b are thin like a chord, and one ends are fixed to points 30a and 30b on the base 3. The base 3 is provided with guide positioning protrusions 31a, 31b and 32a, 32b having L-shaped notches. The guide shafts 10a, 10b are connected to tension springs 11a, 11b via guide positioning protrusions 31a, 31b and 32a, 32b. The other ends of the extension springs 11a and 11b are connected to the base 3 at points 33a and 3b.
3b.

The points 30a and 33a are not on the straight line connecting the guide positioning projections 31a and 32a, but are on the guide shaft 10a.
Are the side surfaces 31A, 3 of the guide positioning protrusions 31a, 32a.
It is arranged to be pressed against 2A. Point 30
b and 33b are not on a straight line connecting the guide positioning protrusions 31b and 32b, and are arranged so that the guide shaft 10b is pressed against the side surfaces 31B and 32B of the guide positioning protrusions 31b and 32b.

As described above, the guide positioning projections 31a,
By making the 32a, 31b, 32b L-shaped, the position adjustment becomes easier than that of the V-shaped as shown in FIG. 1, and the device can be manufactured easily. Further, the guide positioning projections 31a, 32a, 31
When the b and 32b are formed integrally with the base 3, FIG.
1 has a right-angled parallel portion, so that it is easier to manufacture a processing die than the configuration of FIG.
Can be easily manufactured.

FIG. 3 is a schematic diagram showing the configuration of still another optical disk device. 3A is a plan view, FIG. 3B is a view in the direction of the arrow X, and FIG. 3C is a cross-sectional view taken along the line CC ′. Here, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The guide shafts 10a and 10b are thin like a chord, and one end is fixed to points 30a and 30b on the base 3.
It is connected to leaf springs 12a, 12b via guide positioning projections 31a, 31b and 32a, 32b provided on the base 3 having a V-shaped groove. Leaf springs 12a, 12
b is fixed to the leaf spring fixing members 13a and 13b, and the leaf spring fixing members 13a and 13b are fixed to the base 3.

As described above, when the tension is applied to the guide shafts 10a and 10b by the leaf springs 12a and 12b, the optical disk device has a higher optical power than the case where the tension springs shown in FIGS. The dimension in the moving direction of the pickup 2 (dimension R in FIG. 3) can be reduced.

FIG. 4 is a schematic diagram showing the configuration of still another optical disk device. Here, the leaf spring in FIG. 3 is formed integrally with the base. 4A is a plan view, FIG. 4B is a view in the direction of the arrow X, and FIG. The same reference numerals as in FIGS. 1 to 3 denote the same parts, and a description thereof will be omitted.

In FIG. 4, the base 3 has a sheet metal structure for thinning and cost reduction.
L-shaped elastic deformation parts 14a, 14b
Is formed. In order to adjust the generated elastic force according to the magnitude of the tension, in the present embodiment, holes 15a and 15b are provided at locations where the bending moment is greatest, and the sectional area of the stress generating portion is adjusted.

With such a configuration, the number of parts can be reduced, and the cost can be reduced.

[0030]

According to the recording / reproducing apparatus of the present invention, a thin member such as a chord can be used as a guide shaft in order to apply tension to the guide shaft and secure straightness of the guide shaft. Therefore, it is not necessary to use a guide shaft having a large diameter as in the above, and the device can be made thinner.

Further, since the accuracy of the guide shaft is not required, the cost can be reduced.

Further, in the recording / reproducing apparatus, since the member for applying tension to the guide shaft is formed integrally with the base, the number of parts can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of an optical disk device of the present invention.

FIG. 2 is a diagram showing another configuration example of the optical disc device of the present invention.

FIG. 3 is a diagram showing still another example of the configuration of the optical disc device of the present invention.

FIG. 4 is a diagram showing still another configuration example of the optical disc device of the present invention.

FIG. 5 is a diagram showing a configuration of a conventional optical disk device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Optical pickup 3 Base 7 Feed screw 8 Nut part 9 DC motor 10a, 10b Guide shaft 11a, 11b Tension spring 12a, 12b Leaf spring 14a, 14b Elastic deformation part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 21/02 610 G11B 7/085

Claims (3)

(57) [Claims] An optical pickup for recording, reproducing, or erasing information on a recording medium, and a pickup driving means for moving the optical pickup along a guide shaft fixed to a base. A recording / reproducing apparatus, comprising: a tension applying means for applying tension to the guide shaft. 2. The recording / reproducing apparatus according to claim 1, wherein said tension applying means is an elastic member connected to at least one end of said guide shaft. 3. The recording / reproducing apparatus according to claim 1, wherein the tension applying means is formed integrally with the base.