JP3111917B2 - Optical pickup device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-density disc,
The present invention relates to an optical pickup device used for recording and reproduction on an optical disk such as a compact disk.

[0002]

2. Description of the Related Art A conventional optical pickup for recording and reproducing a high-density recording disk and a compact disk, particularly a feed mechanism for moving a carriage to the inner and outer circumferences, will be described. FIG. 5 is a front view of a conventional optical pickup feed mechanism.

[0003] Each mechanical component is mounted on an optical pickup base . Then, 101 at the feed motor, the pinion gear 103 for transmitting the power of the feed motor 101 is mounted by means of press fitting or the like. Reference numeral 102 denotes a motor bracket, and the feed motor 101 is fixedly supported by two fixing screws. 10
Reference numeral 4 denotes a train gear used to transmit the power of the feed motor 101 and reduce the rotation. 10
Reference numeral 5 denotes a train shaft, which is attached to the motor bracket 102 by press fitting or the like, and serves as a rotating shaft of the train gear 104. Reference numeral 106 denotes a shaft gear to which a lead screw shaft 107 is attached by press fitting. The shaft gear 106 is used to transmit the power of the feed motor 101 and reduce the rotation. The lead screw shaft 107 is also used to transmit the power of the feed motor 101 and reduce the rotation speed.

FIG. 6 is an enlarged view of a conventional rack portion, and FIG.
FIG. 7 is a sectional view taken along line BB of FIG. As shown in FIGS. 6 and 7,
A groove is formed in the lead screw shaft 107 in a spiral shape. A rack 108 made of resin is sandwiched between the carriage 110 using a leaf spring 109 made of SUS304, and only one fixing screw 111 is fixed to the carriage 110.
And fix the rack 108 with the lead screw shaft 1
It is meshed by pressing it against 07. In this state, by rotating the feed motor 101 in the forward and reverse directions as shown in FIG. 5, the rack 108 follows the groove formed on the lead screw shaft 107, and the carriage 110 Move to the side.

[0005]

However, in the configuration of the conventional optical pickup, a rack 108 made of resin is attached to a carriage 110 and a leaf spring 109 is provided.
, And fixation with the fixing screw 111, which has a problem in assemblability.

When the lead screw shaft 107 and the rack 108 are required to move the carriage 110 with high precision, the positioning portion of the rack 108 attached to the carriage 110 is formed of resin. The positioning portion of the rack 108 is set parallel to the lead screw shaft 107. As a result, there is a variation in a mounting position due to a lack of a sufficient length of a positioning portion for fixing the rack 108, and the like. It is necessary to sufficiently increase the accuracy and reduce variations at the time of assembling, and there are also problems in cost and productivity.

Further, the leaf spring 1 for fixing the rack 108
Also in 09, the bent portion was short in the current shape and the material was SUS304, so that there was a problem in prolonged bending.

An object of the present invention is to provide a pickup device which is easy to assemble, can be assembled with a high degree of verticality, has a wide allowable elastic range, is small, and has excellent space utilization.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional optical pickup, and a rack meshing with a lead screw shaft is welded to a rack spring to form an integral part. did.

The position of the positioning portion of the rack meshing with the lead screw shaft is perpendicular to the screw shaft, and the shape of the rack spring integrated with the rack is an annular shape in which the outside is a cantilever and the center is a fixed portion. In addition to a leaf spring, the material was also subjected to heat treatment (TH1050 and RH950) by SUS631-CSP.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to an optical pickup having a moving means mounted on an optical reading means for moving in a radial direction of an optical disk, and a driving means for driving the moving means. An apparatus, wherein the driving means comprises:
A drive shaft having a helical groove, an engaging means for engaging the groove, and an urging means for urging the engaging means against the drive shaft, the urging means being fixed to the moving means; Central straight for
A rectangular ring that branches off so as to intersect the line and the central straight line
Plate-like elastic member formed in a shape having a cantilever portion
Wherein the engaging means is disposed on the cantilever portion,
An optical pickup apparatus characterized in that it is arranged on a straight line forming a substantially perpendicular to the straight portions the drive shaft.
ADVANTAGE OF THE INVENTION According to this invention, assembling is easy and can assemble with a high degree of perpendicularity.

According to a second aspect of the present invention, the central straight portion is a straight line substantially perpendicular to the drive shaft.
Fixed to the moving means by the fixing means arranged above,
The fixing means has a fastening means and a plurality of positioning means,
The distance between the two furthest points of the plurality of positioning
Position located closest to the drive shaft from the center of the drive shaft
Set longer than the distance to the decision means
The optical pickup device is characterized in that the plate-like elastic member is obtained by applying heat treatment to a stainless steel plate spring material.
It is an optical pickup device characterized by
The distance between the two points, which are the farthest points of the positioning means,
From the center to the positioning means located closest to the drive shaft
That the ratio of the distance to the target is 2: 1.
An optical pickup device characterized by the following. According to the present invention, it is possible to provide a pickup device which is easy to assemble, can be assembled with a high degree of verticality, has a wide allowable elastic range, is small, and has excellent space utilization.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment) FIG. 1 is a plan view of an optical pickup module according to the present invention. An optical disk 1 is a high-density optical disk or a compact disk. Reference numeral 2 denotes a spindle motor for rotating the optical disk 1 and a mechanism for clamping the optical disk 1 by self-holding. Further, there is a mechanism for adjusting the skew of the turntable 2a on which the optical disc 1 is placed. Reference numeral 3 denotes an optical pickup unit for recording and reproducing information on and from the optical disk 1, and reference numeral 4 denotes a feed unit for moving the optical pickup unit 3 to the inner and outer circumferences of the optical disk 1. Reference numeral 5 denotes a module base on which the spindle motor unit 2, the optical pickup unit 3, and the feed unit 4 are mounted. Reference numerals 6 and 7 denote flexible substrates for supplying information and power to the spindle motor unit 2 and the optical pickup unit 3 from the main substrate.

FIG. 2 is an enlarged plan view of the feed section 4 of the present invention. In FIG. 2, reference numeral 5 denotes a module base which is a base on which each mechanical component is mounted. Reference numeral 8 denotes a feed motor, which transmits a power of the feed motor 8 and rotates a shaft gear 12 via a pinion gear 9 and a train gear 10 to thereby lead the lead screw shaft 11 into which the shaft gear 12 is press-fitted.
To rotate. A spiral groove is formed in the lead screw shaft 11.

FIG. 3 is an enlarged view of the rack portion, and FIG.
FIG. 4 is a cross-sectional view taken along a line A. 3 and 4, reference numeral 13 denotes a carriage. The lead screw shaft 11 is inserted into a through hole provided at an end portion, and also serves as a guide for the carriage 13. The carriage 13 has a screw portion (female screw corresponding to the fixing screw 17) and two positioning pins 19.
Are arranged on a straight line in a direction orthogonal to the lead screw shaft 11. Further, the two positioning pins 19 are a ratio of the distance 16a between the center line (virtual line in design) of the lead screw shaft 11 and the nearest positioning pin 19 to the distance 16b between the two points of the positioning pin 19. Are arranged so as to be 1: 2.

Reference numeral 14 denotes a rack, which is a two-point heat-welded portion 1.
8 and mesh with the spiral groove of the lead screw shaft 11. The two heat-welded portions 18 correspond to the rack spring 1
5 is inserted into the hole provided in
The point heat-welded portion 18 is melted and fixed to the rack spring 15. The rack 14 is made of polyacetal which satisfies the above welding workability, abrasion resistance to the lead screw shaft 11 and sliding friction characteristics.

Reference numeral 15 denotes a rack spring, which has a linear portion whose center portion is fixed to the carriage 13, and is formed in a rectangular annular cantilever crossing the center portion. The center portion is provided with a positioning hole that satisfies the distance 16b described above. At the intersection of the central part and the cantilever part, a fixing hole for the fixing screw 17 is provided. The cantilever portion farthest from the intersection is provided with two holes for positioning and welding for fixing the rack 14 described above.
The material of the rack spring 15 is a heat treatment (TH1050 and R10) of stainless steel leaf spring material SUS631-CSP.
H950) is added to the carriage 13 as a material that improves the spring resistance and is less likely to cause plastic deformation.
Can withstand severe movements.

Thus, the rack 14 is fixed to the rack spring 15 by the two heat-welded portions 18. Further, the rack spring 15 has two positioning pins 19.
And is attached to the carriage 13 by one fixing screw 17. The rack 14 is pressed and urged into the spiral groove of the lead screw shaft 11 by the action of the cantilever portion of the rack spring 15 to rotate the lead screw shaft 11.
The carriage 13 moves to the inner circumference and the outer circumference of the optical disc 1.

[0019]

As described above, according to the present invention, when the rack is mounted on the carriage, the rack is already thermally welded to the rack spring, so that it is not necessary to separately mount the rack and the rack spring. It will be easier. Further, since the positioning portion of the rack spring integrated with the rack is perpendicular to the lead screw shaft, the positioning portion of the rack spring can have a sufficient length, and the mounting accuracy to the carriage is improved. Furthermore, the shape of the rack spring integrated with the rack is such that the outside is a cantilever beam, the center is a fixed part, and the material is SUS631-CSP to which heat treatment (TH1050 and RH950) has been applied, so that the allowable elastic range is obtained. And can be used without any problem even when bending for a long time.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical pickup module according to the present invention.

FIG. 2 is an enlarged plan view of a feed unit according to the present invention.

FIG. 3 is an enlarged view of a rack portion.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a front view of a conventional optical pickup feed mechanism.

FIG. 6 is an enlarged view of a conventional rack part.

FIG. 7 is a sectional view taken along line BB of FIG. 6;

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 spindle motor unit 2a turntable 3 optical pickup unit 4 feed unit 5 module base 6, 7 flexible board 7 flexible board 2 8 hood motor 9 pinion gear 10 train gear 11 lead screw shaft 12 shaft gear 13 carriage 14 rack 15 rack Spring 16a, 16b Distance 17 Fixing screw 18 Heat welding part 19 Positioning pin 100 Optical pickup base 101 Feed motor 102 Motor bracket 103 Pinion gear 104 Train gear 105 Train shaft 106 Shaft gear 107 Lead screw shaft 108 Rack 109 Leaf spring 110 Carriage 111 Fixed screw

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 7/085 G11B 21/02 611

Claims (4)

(57) [Claims] 1. An optical pickup device comprising: moving means for mounting an optical reading means and moving in a radial direction of an optical disk; and driving means for driving the moving means, wherein the driving means has a spiral shape. A drive shaft having a groove, an engaging means for engaging the groove, and an urging means for urging the engaging means against the drive shaft, wherein the urging means is fixed to the moving means. Central straight to
A rectangle that branches off so as to intersect the line and the central straight line
Plate-like elasticity formed into a shape with an annular cantilever
A member, wherein the engagement means is disposed on the cantilever portion.
Is, the optical pickup apparatus characterized by being arranged on a straight line forming a substantially perpendicular to said central straight portion is the drive shaft. 2. The central straight portion is substantially opposite to the drive shaft.
The fixing means is arranged on a straight line that is substantially vertical.
Is fixed to the moving means, said fixing means have a a fastening means and a plurality of positioning means
And, the distance between two points forming a farthest point of a plurality of said positioning means is set longer than the forming distance between the center of said drive shaft to said positioning means arranged on the most proximal point on the drive shaft The optical pickup device according to claim 1, wherein 3. The optical pickup device according to claim 1, wherein said plate-shaped elastic member is obtained by heat-treating a stainless steel leaf spring material. 4. The method according to claim 1 , wherein the plurality of positioning means form a farthest point.
The distance between the two points and the distance from the center of the drive shaft to the drive shaft
Also the distance to the positioning means arranged at the near point and
Are arranged so that the ratio is 2: 1.
The optical pickup device according to claim 2.