JPH09297973A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of an optical pickup by guiding an optical base moving by being screwingly engaged with the feed screw held freely rotatably to a chassis while making the edge part of a hole formed in the chassis as a guiding part to reduce the number of parts of the device. SOLUTION: One end part of a feed screw 20 is inserted into the hole of a bearing 23. The rotational driving force of a motor 25 is transmitted to a gear 24 with a transmission mechanism to rotate the screw 20. The cap 26 covered on the other end of the screw 20 is inserted into the hole of the rise tab 27 of a chassis 21. A coil spring 28 is arranged in between the rise tab 27 and the flange of the cap 26 and the screw 20 is energized to the direction of the bearing 23 with the elasticity of the spring 28. A hole 20 into which the screw 20 is to be inserted is formed in an optical base 29. A member 30 attached to the base 29 with a screw 31 is screwingly engaged with the screw 20. A resin member 35 is attached to the tip end of a leaf spring 33 fixed with a screw 34 to the base 29. The hole edge part 21B of the hole 21A formed in the chassis 21 is held by the tip end of the spring 33 and the protrusion 32 of the base 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device used for reading and writing information from a digital audio disc such as a compact disc (CD).

[0002]

2. Description of the Related Art FIGS. 6 to 9 show a conventional optical pickup device. 6 to 9, reference numeral 1 denotes a chassis, and a motor 2 for rotating and driving a turntable for a disc is attached to the chassis 1. Reference numeral 3 denotes a feed screw rotatably held in the chassis 1, which applies a rotational driving force of a motor 4 fixed to the chassis 1 to a gear train 5
The feed screw 3 is transmitted to the feed screw 3 via the. 6 is an optical base, and this optical base 6
A laser light emitting element, a light receiving element, an optical element such as a mirror, an objective lens, a drive mechanism for driving the objective lens, and the like are provided in the. Reference numerals 7 and 8 denote guide shafts attached to the hole edge portion of the hole 1A of the chassis 1, and these guide shafts are the optical base 6
The optical base 6 slides under the guide shafts 7 and 8 by being inserted into the holes. Reference numeral 9 is a shaft pressing metal fitting for fixing the guide shafts 7, 8 to the chassis 1. The shaft pressing metal fitting 9 is attached to the chassis 1 with a screw 10, and the guide shafts 7, 8 are pressed by the shaft pressing metal fitting 9. Is pressed by a protrusion formed on the edge of the hole 1A of the chassis 1 to regulate its position. Reference numeral 11 denotes an elastic member attached to the optical base 6 with a screw 12, and the tip end of the elastic member 11 is the guide shaft 8 described above.
The elastic member 11 absorbs the clearance for sliding the guide shaft 8. A member that is screwed onto the feed screw 3 is attached to the optical base 6. The rotational driving force of the motor 4 is transmitted to the feed screw 3 via the gear train 5, and the feed screw 3 rotates. When the feed screw 3 rotates, the optical base 6 having a member screwed onto the feed screw 3 is guided by the guide shafts 7 and 8 to slide. The moving direction of the optical base 6 is the radial direction of the disk held on the turntable.

[0003]

As described above, the conventional optical pickup device guides the optical base 6 with the two guide shafts 7 and 8, so that the shaft holding metal fittings for fixing the two guide shafts 7 and 8 are provided. 9 and the screw 10 are required, and the elastic member 11 for absorbing the clearance for sliding the guide shaft 8 is required. Therefore, the number of parts is increased and the structure is complicated.

The present invention solves the above-mentioned conventional problems and provides an optical pickup device having a small number of parts and a simple structure.

[0005]

In order to achieve the above object, the present invention provides an optical base, which is rotatably held by a chassis and which moves by screwing a feed screw, into a hole formed in the chassis. By using the hole edge portion as a guide portion as a guide, the number of parts is small and the structure is simplified.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is
Formed on the chassis, a feed screw rotatably held on the chassis, drive means for rotating the feed screw, an optical base screwed onto the feed screw and moving with rotation of the feed screw. The optical base is slid by the elastic member held by the optical base and the optical member, and the optical base is slid using the hole edge of the chassis as a guide. And the structure is simple.

According to a second aspect of the present invention, an elastic member is constituted by a leaf spring having one end fixed to an optical base and a resin member provided at the other end, and the resin member of the leaf spring and the optical base are formed. The present invention is characterized in that the hole edge of the chassis is sandwiched between the table and the table, and the optical base can be slid smoothly using the hole edge of the chassis as a guide.

According to a third aspect of the present invention, the hole edge portion of the chassis is sandwiched by the cylindrical protrusion integrally formed on the optical base and the elastic member held by the optical base. The optical base can be smoothly slid by using the hole edge portion of the chassis as a guide.

The invention according to claim 4 of the present invention is characterized in that a resin member is provided at the tip of a cylindrical projection formed on the optical base, and the sliding of the optical base is further facilitated. It can be done smoothly.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIGS. 1 to 4 show the structure of an optical pickup device according to the present embodiment. 1 to 4
In the figure, 20 is a lead screw and 23 is a chassis 21.
The bearing is attached to the bearing 23 with a screw 22, and one end of the feed screw 20 is inserted into a hole of the bearing 23. Two
4 is a gear fixed to the feed screw 20, 25 is a motor attached to the chassis 21, and the rotational driving force of the motor 25 is transmitted to the gear 24 via a transmission mechanism to rotate the feed screw 20. is there. Reference numeral 26 denotes a cap that covers the other end of the feed screw 20, and the cap 26 is inserted into the hole of the cut and raised piece 27 of the chassis 21. 28
Is a coil spring, and the coil spring 28 is arranged between the cut-and-raised piece 27 and the flange of the cap 26, and the elastic force of the coil spring 28 causes the feed screw 20 to receive the bearing 23.
Is biased in the direction of. Reference numeral 29 is an optical base, and a hole into which the feed screw 20 is inserted is formed in the optical base 29. Reference numeral 30 denotes a member attached to the optical base 29 with a screw 31, and this member 30 is screwed to the feed screw 20. Reference numeral 32 is a cylindrical protrusion integrally formed on the optical base 29. A leaf spring 33 has one end fixed to the optical base 29 with a screw 34, and a resin member 35 is attached to the tip of the leaf spring 32. Due to the tip of the leaf spring 33 and the protrusion 32 of the optical base 29, the hole edge portion 21B of the hole 21A formed in the chassis 21.
Is sandwiched between.

In the above embodiment, when the motor 25 rotates, this rotational driving force is transmitted to the gear 24 via the transmission mechanism, and the feed screw 20 rotates. Optical base 2
Since the member 31 attached to 9 is screwed into the feed screw 20, the optical base 29 moves while the hole edge portion 21B is held between the protrusion 32 and the leaf spring 33.

As described above, according to the present embodiment, the guide shafts 7 and 8 in the conventional example are not used, and the hole edge portion 21B of the chassis 21 sandwiched between the protrusion 32 and the leaf spring 33 is used as a guide for optical operation. Since the base 29 is moved, there is an advantage that the number of parts is small and the structure is simple.

As shown in FIG. 5, a member 36 made of resin or the like for reducing the sliding resistance is provided at the tip of the projection 32 formed on the optical base 29 to smoothly slide the optical base 29. You may choose to do this.

[0014]

As described above, according to the present invention, the optical base is moved using the chassis as a guide without using the guide shaft for guiding the optical base.
An optical pickup device having a small number of parts and a simple structure can be provided.

[Brief description of drawings]

FIG. 1 is a front view of an optical pickup device according to an embodiment of the present invention.

FIG. 2 is a top view of the same embodiment.

FIG. 3 is an exploded perspective view of the same embodiment.

FIG. 4 is an exploded perspective view of a main part of the same embodiment.

FIG. 5 is a front view of a main part according to another embodiment of the present invention.

FIG. 6 is a front view of a conventional optical pickup device.

FIG. 7 is a top view of the conventional example.

FIG. 8 is an exploded perspective view of the conventional example.

FIG. 9 is a perspective view of a main part of the conventional example.

[Explanation of symbols]

 20 Feed Screw 21 Chassis 21B Hole Edge 23 Bearing 24 Gear 25 Motor 29 Optical Base 32 Protrusion 33 Leaf Spring 35 Resin Member 36 Resin Member

Claims (4)

[Claims] 1. A feed screw rotatably held by a chassis, drive means for rotating the feed screw, and an optical base which is screwed to the feed screw and moves with the rotation of the feed screw. An optical pickup device characterized in that a hole edge portion of a hole formed in the chassis is sandwiched by an elastic member held by the optical base and the optical member. 2. An elastic member is constituted by a leaf spring having one end fixed to an optical base and a resin member provided at the other end, and the hole edge portion of the chassis is formed by the resin member of the leaf spring and the optical base. The optical pickup device according to claim 1, wherein the optical pickup device is sandwiched. 3. The hole edge of the chassis is clamped by a columnar protrusion integrally formed on the optical base and an elastic member held by the optical base. Optical pickup device. 4. The optical pickup device according to claim 3, wherein a resin member is provided at the tip of a cylindrical protrusion formed on the optical base.