JP3799715B2 - Optical pickup device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup device used for reading and writing information in a disk device for reproducing and recording a disk on which digital information such as a compact disk (CD) is recorded.
[0002]
[Prior art]
3 to 5 show the structure of a conventional optical pickup device. 3 is a perspective view from the back side of the apparatus, FIG. 4 is a perspective view from the top side of the apparatus, and FIG. 5 is a front view of the main part of the apparatus. 3 to 5, reference numeral 1 denotes a chassis, and a motor 2 a that rotationally drives a turntable 2 on which the disk D is placed is attached to the chassis. Reference numeral 3 denotes a feed screw. The feed screw 3 is rotationally driven by a motor 4 via a gear 5 . Reference numeral 6 denotes an optical base. The optical base 6 is provided with an optical element such as a laser light emitting element, a light receiving element and a mirror, an objective lens, a trajectory mechanism for driving the objective lens, and the like. An attachment member 7 is fixed to the optical base 6, and this attachment member 7 is screwed to the feed screw 3.
[0003]
Reference numeral 8 denotes a cap. The cap 8 is held by the cut and raised piece 1 a of the chassis 1. Reference numeral 9 denotes a coil spring. The coil spring 9 is disposed between the cut and raised piece 1a and the flange portion of the cap 8, and the feed screw 3 is urged in one direction by the elastic force of the coil spring 9. Reference numeral 10 denotes a cylindrical protrusion formed integrally with the optical base 6. Reference numeral 11 denotes a leaf spring having one end fixed to the optical base 6, and a resin member is attached to the tip of the leaf spring 11.
[0004]
The operation of the conventional optical pickup device configured as described above will be described. When the motor 4 rotates, the feed screw 3 rotates through the gear 5. When the feed screw 3 rotates, the optical base 6 moves in the radial direction of the disk D via the mounting member 7. At this time, as shown in FIG. 5, the optical base 6 is held at one end of the optical base 6 while the chassis 1 is sandwiched between the protrusion 10 and the resin member fixed to the tip of the leaf spring 11. It is guided by the chassis 1 and moves.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional optical pickup device, the optical base 6 is guided and slid by the chassis 1 in a state where the optical base 6 is sandwiched between the protrusion 10 and the resin member fixed to the tip of the leaf spring 11. There was a problem that the sliding load fluctuated due to variations in the friction coefficient of the portion, and the sliding durability of the clamping portion deteriorated.
[0006]
The present invention solves the above-described conventional problems, and when the optical base of the optical pickup device is guided and transferred by the chassis, a stable sliding load can be obtained without fluctuation of the sliding load, Furthermore, it aims at providing the optical pick-up apparatus which can improve sliding durability.
[0007]
[Means for Solving the Problems]
To accomplish the above object, a Rukatamitai such a magnetic material, wherein a rotatably supported feed screw to the housing, the rotation of the screwed before Symbol feed screw to said feed screw It includes an optical base that moves, a projection provided on one end of said optical base, and a magnet fixed on the front Symbol optical base according to, the magnet is located in the vicinity of the projection And the said magnet and the said housing | casing oppose through the space | gap .
[0008]
Thus, the suction force before Symbol magnet, before SL can be held by pressing the optical base before Kikatami body, when the optical base is transported while being guided by the chassis, the sliding load variations Without this, a stable sliding load can be obtained, and the sliding durability can be further improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention includes a Rukatamitai such a magnetic material, wherein a rotatably supported feed screw to the housing, the rotation of the screwed before Symbol feed screw to said feed screw It includes an optical base that moves, a projection provided on one end of said optical base, and a magnet fixed on the front Symbol optical base according to, the magnet is located in the vicinity of the projection and wherein said magnet is a housing face each other with a gap, by the suction force of the pre-Symbol magnet, which is a pre-Symbol characterized in that pressing and holding the optical base before Kikatami body When the optical base is guided and transferred by the chassis, a stable sliding load can be obtained without fluctuation of the sliding load, and the sliding durability can be improved.
[0010]
According to a second aspect of the present invention, in addition to the first aspect of the invention, a yoke made of a magnetic material is provided. One end of the yoke is fixed between the optical base and the magnet, and the yoke the other end opposite to the magnet across the housing of the other end portion of the yoke and the housing is characterized in that it has a gap, the holding of the optical base to the housing Even when an improvement in force and an impact force or the like greater than the holding force are applied to the optical base, the optical base can be provided with a function of preventing the optical base from falling off.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment)
FIG. 1 and FIG. 2 are a perspective view and a front view of an essential part showing a configuration of an optical pickup device according to an embodiment of the present invention. About the same structure of the conventional optical pick-up apparatus shown in FIGS. 3-5, the same code | symbol is described and description is abbreviate | omitted.
[0012]
In FIGS. 1 and 2, reference numeral 12 denotes a cylindrical protrusion provided at one end of the optical base 6.
Reference numeral 13 denotes a magnet. The magnet 13 is fixed on the optical base 6 in the vicinity of the protrusion 12. As shown in FIG. 2, an air gap 13 b as a gap is formed between the magnet 13 and the chassis 1. 14 is a yoke ing a magnetic material, one end of the yoke 14 is attached by screws or the like to optical base 6. As shown in FIG. 2, the other end portion of the yoke 14 is bent outward in a U shape through the gap with the chassis 1 so as to face the magnet 13 with the chassis 1 interposed therebetween to form a yoke bent portion 14 a. ing. Reference numeral 15 denotes a chassis hole formed in the chassis 1, and reference numeral 15 a denotes a hole edge of the chassis hole 15.
[0013]
Next, the operation of the present embodiment configured as described above will be described. As in the conventional optical pickup device shown in FIG. 3, when the motor 4 rotates, the feed screw 3 rotates through the gear 5, and when the feed screw 3 rotates, the optical base 6 is connected to the disk D through the mounting member 7. Move in the radial direction.
[0014]
Here, since the chassis 1 is made of a magnetic material such as an iron plate, the optical base 6 is attracted to the chassis 1 side by the attractive force of the magnet 13. At this time, the protrusion 12 is pressed against the chassis 1 with a predetermined attractive force determined by the size, material, air gap 13b and the like of the magnet 13. Therefore, the optical base 6 moves in a state where a constant load generated between the protrusion 12 and the chassis 1 is generated. Accordingly, the optical base 6 can be moved while maintaining the horizontal state in which the projections 12 are always in contact with the chassis 1 without causing the fluctuation of the sliding load due to the variation in the friction coefficient of the contact portion. It is.
[0015]
Further, even when an impact force greater than the attractive force of the magnet 13 acts downward due to an unnecessary impact or the like and the contact between the projection 12 and the chassis 1 is released, the yoke bent portion 14a contacts the chassis 1 and optically The base 6 can be prevented from dropping, and the projection 12 and the chassis 1 can be brought into contact again by the attractive force of the magnet 13 to hold the optical base 6 in a normal position.
[0016]
As described above, according to the present embodiment, the optical base 6 can be moved using the chassis 1 as a guide by the attractive force of the magnet 13 without using a leaf spring as in the prior art. The mechanical contact between the spring and the chassis is eliminated, and stable sliding performance and movement durability can be improved.
[0017]
【The invention's effect】
As described above, the present invention has an effect that stable sliding performance and improvement in movement durability can be achieved because the optical base is held and moved by the attractive force of the magnet.
[Brief description of the drawings]
FIG. 1 is a perspective view of an optical pickup device according to an embodiment of the present invention. FIG. 2 is a front view of a main part of the device. FIG. 3 is a perspective view from a rear view of a conventional optical pickup device. Perspective view from the top side of a conventional device [FIG. 5] Front view of relevant parts of the conventional device [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chassis 3 Feed screw 6 Optical base 12 Protrusion 13 Magnet 13 b Air gap 14 Yoke 14a Yoke bending part 15 Chassis hole 15a Hole edge

Claims (2)

And Rukatamitai such a magnetic material, a feed screw rotatably supported to the housing, and the optical base which moves in response to rotation of the feed screw engaged before Symbol feed screw into the screw, the optical a projection provided on one end of the base, pre-SL and a magnet fixed on the optical base, wherein the magnet is located in the vicinity of the projections, and the gap is between the housing and the magnet face each other with a, by the suction force of the pre-Symbol magnet, before Symbol optical pickup apparatus characterized by pressing and holding the optical base before Kikatami body. Comprising a yoke of magnetic material, one end of the yoke is fixed between said magnet and said optical base, the other end of the yoke opposite the magnets across the housing, the yoke The optical pickup device according to claim 1 , wherein the other end portion and the housing have a gap .

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