JP2006266469A - Rectilinearly moving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mold rack teeth of a rack body with a molding die which can be separated into an upper part and a lower part by using a resin material. <P>SOLUTION: The rectilinearly moving device is equipped with a rectilinearly movable optical pickup 14, the rack body 17 consisting of a fixing member 17a integrally fixed to the optical pickup 14 and a rack part 17g, with the rack teeth 17g6, 17g7 formed on it, keeping approximately vertical position to the fixing part 17a and a lead screw 23 with a spiral groove part 23a formed on it which is rotation-driven by a motor 22 and intermeshes with the rack teeth 17g6, 17g7. When forming the rack teeth 17g6, 17g7 at the rack part 17g of the rack body 17 with the molding die which can be separated into the upper part and the lower part by using the resin material, the rack teeth 17g6, 17g7 are formed at the rack part 17g by extending the rack part 17g in approximately parallel to the fixing part 17a and bending parts 17e, 17f for bending the rack part 17g within its elastic displacement so that the rack part 17g takes the approximately vertical position to the fixing part 17a are formed between the fixing part 17a and the rack part 17g. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  In the present invention, a rack screw formed in a rack portion of a rack body is meshed with a lead screw that is rotationally driven by a motor and has a spiral groove portion, and a carriage in which the rack body is integrally attached is linearly guided through a guide member. The present invention relates to a linear moving device to be moved.

In general, linear moving devices that move a moving body linearly have various structural forms. Among these types of linear moving devices, a rack body is attached to a lead screw that is rotationally driven by a motor and has a spiral groove. A linear movement device that linearly moves a carriage integrally mounted with a rack body through a guide member by meshing rack teeth formed in the rack portion and converting the rotation of the lead screw so that the rack body can move linearly. For example, it is applied to an optical pickup feeding device in an optical disk drive (see, for example, Patent Document 1).
JP 2002-138611 A

  FIG. 6 is a perspective view showing an optical pickup feeding device as an example of a conventional linear moving device.

  An optical pickup feeding device 100 as an example of the conventional linear movement device shown in FIG. 6 is disclosed in the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2002-138611). A brief description will be given with reference.

  As shown in FIG. 6, in the optical pickup feeding apparatus 100 described above, an optical pickup 101 for recording and / or reproducing with respect to an optical disk (not shown) is guided to first and second guide shafts 102 and 103 which are parallel to each other. It is provided so as to be linearly movable in the X-axis direction. At this time, the optical pickup 101 is a linearly movable carriage. The first guide shaft 102 is fitted in a hole 101 a formed through one end of the optical pickup 101, and The second guide shaft 103 is fitted into a groove portion 101b formed by opening a part on the end side.

  Also, on one end side of the optical pickup 101, a lead screw 105 attached to the shaft of the motor 104 and driven to rotate and having a spiral groove 105a is provided substantially parallel to the first and second guide shafts 102 and 103. Yes.

  The rack groove 106a of the lead screw 105 is always meshed with rack teeth 106c1 formed in the rack portion 106c of the rack body 106 fixed to one end of the optical pickup 101.

  The rack body 106 described above connects the L-shaped fixing portion 106a fixed to the bottom surface and one end surface of the optical pickup 101, the L-shaped fixing portion 106a and the rack portion 106c described below, and connects the rack portion 106c. A rack having a connecting portion 106b formed thin for elastic displacement and a rack tooth 106c1 that always meshes with the spiral groove 105a of the lead screw 105, and substantially perpendicular to the horizontal portion of the L-shaped fixing portion 106a. The portion 106c is integrally molded using a resin material.

  A compression coil spring 107 is mounted between the L-shaped fixing portion 106a and the rack portion 106c of the rack body 106, and a rack formed in the rack portion 106c by the urging force of the compression coil spring 107 and the elastic displacement of the connecting portion 106b. The teeth 106c1 are pressed toward the lead screw 105.

  When the motor 104 in the optical pickup feeder 100 configured as described above is started and the lead screw 105 is rotated, the rack teeth 106c1 of the rack body 106 meshed with the spiral groove 105a of the lead screw 105 are moved in the X-axis direction. Since it is pushed, the optical pickup 101 to which the rack body 106 is fixed is guided by the first and second guide shafts 102 and 103 and can move in the X-axis direction which is the radial direction of the optical disc.

  By the way, in the optical pickup feeding device 100 as an example of a conventional linear moving device, a lead screw 105 that is rotationally driven by a motor 104 and has a spiral groove portion 105a, and rack teeth 106c1 that mesh with the lead screw 105 are provided in a rack portion. Although the optical pickup 101 integrally attached with the rack body 106 can be moved in the radial direction of the optical disk by the rack body 106 that is formed on 106c and converts the rotational motion of the lead screw 105 into a linear motion, as described above. When the rack teeth 106c1 are formed on the rack portion 106c that is substantially perpendicular to the horizontal portion of the L-shaped fixed portion 106a in the rack body 106 made of a resin material, the rack teeth 106c1 are vertically moved in the molding die. You must use a slide mold, not a loose mold Since, the molding die cost is high, a problem that also increases component cost of the rack 106 along with this has occurred.

  Therefore, when the rack teeth of the rack body are meshed with a lead screw that is rotationally driven by a motor and has a spiral groove portion, the rack body is attached to the rack body to move linearly through the guide member. In the case where the rack teeth are formed in a rack portion that is substantially perpendicular to the fixed portion that is fixed to the carriage, a linear moving device that can reduce the cost of the molding die is desired.

The present invention has been made in view of the above problems, and the invention according to claim 1 includes a linearly movable carriage,
A rack body composed of a fixed portion that is integrally fixed to the carriage, and a rack portion that is maintained substantially perpendicular to the fixed portion and has rack teeth formed thereon;
In a linear movement device provided with a lead screw that is rotationally driven by a motor and that forms a spiral groove that meshes with the rack teeth,
In forming the rack portion of the rack body using a resin material with a molding die capable of separating the rack teeth vertically, the rack portion is extended substantially parallel to the fixed portion, and the rack portion is Forming rack teeth and forming a bent portion between the fixed portion and the rack portion for bending the rack portion in an elastic displacement so as to be in a posture substantially perpendicular to the fixed portion. It is the linear movement apparatus characterized by these.

The invention according to claim 2 is the linear movement device according to claim 1,
When the rack body is bent through the bent portion so that the rack portion is substantially perpendicular to the fixed portion, the rack body has rigidity in the feeding direction by the lead screw. The linear moving device is characterized in that a rib for holding is formed so as to be engageable between the fixed portion and the rack portion.

  According to the linear movement device of the first aspect, when the rack teeth formed on the rack portion of the rack body are meshed with the spiral groove portion of the lead screw that is rotationally driven by the motor, the rack teeth are particularly formed on the rack portion of the rack body. When using a resin material in a mold that can be separated vertically, the rack part is extended substantially parallel to the fixed part to form rack teeth, and the rack part is fixed to the fixed part. Since the bent portion for bending within the elastic displacement is formed between the fixed portion and the rack portion so as to have a substantially vertical posture, the rack teeth do not need to use a slide-type molding die. The mold cost is reduced, and accordingly, the parts cost of the rack body is also reduced.

  In addition, according to the linear moving device according to claim 2, in particular, when the rack body is bent via the bent portion so that the rack portion is in a posture substantially perpendicular to the fixed portion, the rack body is Since the rib for giving rigidity in the feed direction by the lead screw is formed so as to be engageable between the fixed portion and the rack portion, the rack portion can increase the rigidity in the feed direction.

  Hereinafter, an embodiment of a linear moving device according to the present invention will be described in detail with reference to FIGS. The linear movement device according to the present invention is driven by a motor and is engaged with a lead screw so that the rack teeth of the rack body are engaged with each other. When rack teeth are formed in a rack portion that is substantially perpendicular to the fixed portion that is fixed to the carriage in the rack body, after the rack portion on which the rack teeth are formed is molded with a mold that can be separated vertically, the rack portion Is configured to be bent substantially perpendicularly to the fixed portion.

  At this time, the linear moving device according to the present invention may have the structure configured as described above. In the following embodiments, the linear moving device according to the present invention is applied to, for example, an optical pickup feeding device in an optical disk drive. Although the case will be described, the present invention is not limited to this, and the present invention can also be applied to a lens feeding device in a video camera.

FIG. 1 is a perspective view showing an optical pickup feeding device as an example of a linear moving device according to the present invention.
2 is an enlarged perspective view of the feed mechanism shown in FIG.
3 (a) and 3 (b) are perspective views showing the shape when the rack body is molded with a molding die that can be separated into upper and lower sides, as viewed from the upper surface side and the lower surface side,
4 (a) and 4 (b) are perspective views showing an enlarged use state after the rack portion of the rack body is bent through the bent portion so as to maintain a substantially vertical posture with respect to the fixed portion. ,
5A and 5B show a state in which the compression coil spring is hooked between a spring hooking boss formed on the hanging portion of the rack body and a spring hooking boss formed on the inner surface of the rack portion. It is the perspective view expanded and shown.

  As shown in FIG. 1, in an optical pickup feeding device 10 as an example of a linear moving device according to the present invention, a spindle motor 12 is rotatably installed on the base 11 on the right side of the drawing. A turntable 13 that rotates integrally with the optical disk D mounted on the motor shaft is attached.

  Further, on the left side of the figure on the base 11, an optical pickup 14 for recording and / or reproducing with respect to the optical disc D is guided by first and second guide shafts 15 and 16 parallel to each other in the X-axis direction. It is provided so that it can move linearly. At this time, the optical pickup 14 is a carriage that can move linearly. The first guide shaft 15 is fitted into a hole 14 a formed through one end of the optical pickup 14, and The second guide shaft 16 is fitted in a groove portion 14b formed by opening a part on the end side.

  An escape hole 11a is formed in the base 11 so as to pass through an optical pickup 14 disposed on the lower surface side of the optical disk D and a feed mechanism portion 20 described later. First and second guide shafts 15 and 16 for guiding the optical pickup 14 to the left and right along the front and rear are provided in parallel, and a drive source for linearly moving the optical pickup 14 toward the first guide shaft 15 side; The feed mechanism unit 20 is provided.

  In the feed mechanism section 20 described above, the feed motor 22 is attached to the bracket 21, and the lead screw 23 attached to the shaft of the feed motor 22 and driven to rotate and having the spiral groove 23a is the first and second guides. The bracket 21 is pivotally supported substantially parallel to the shafts 15 and 16.

  A rack body 17 having rack teeth 17g6, 17g7 is integrally fixed to one end side of the optical pickup 14.

  2, the spiral groove 23a of the lead screw 23 that is rotationally driven by the feed motor 22 in the feed mechanism unit 20 has a fixed portion on one end side of the optical pickup 14 (FIG. 1). Two rack teeth 17g6 and 17g7 formed on the rack portion 17g held in a posture substantially perpendicular to the fixed portion 17a among the rack body 17 fixed via 17a are pressed by a compression coil spring 18 described later. While always meshing.

  Here, the above-described rack body 17 is a member that constitutes a main part of the embodiment. For example, the two rack teeth 17g6 and 17g7 are formed integrally with a molding die that can be separated vertically using a polyacetal resin. The rack portion 17g formed with a bent portion is characterized by being bent through bent portions 17e and 17f, which will be described later, so as to have a substantially vertical posture with respect to the fixed portion 17a.

  That is, as shown in FIGS. 3A and 3B in an enlarged manner, the rack body 17 which is the main part of the embodiment is in the form of use in meshing with the lead screw 23 (FIGS. 1 and 2). Differently, it is molded using a polyacetal resin into a shape that can be integrally molded with a mold that can be separated vertically.

  More specifically, the rack body 17 is fixed to the bottom surface 14c of the optical pickup 14 shown in FIG. 1 by two positioning bosses 17a1 and 17a2 and fixed from the mounting holes 17a3 through screws (not shown). A flat fixing portion 17a, a hanging portion 17b that is suspended downward from the flat fixing portion 17a and has a spring-engaging boss 17b1 projecting from the center, and a back surface of the fixing portion 17a and a back surface of the hanging portion 17b. And two triangular ribs 17ab1 and 17ab2 connected in a triangular shape, and thinly and horizontally extending from both lower ends of the hanging portion 17b toward the lead screw 23 (FIGS. 1 and 2) at a predetermined interval. Two rectangular ribs 17bc, 1 connected to the two connected pieces 17c, 17d, the hanging portion 17b, and the two connected pieces 17c, 17d at right angles, respectively. bd and the two connecting portions 17c and 17d are thinned from the back end side of each of the two connecting pieces 17c and 17d, and are bent from two bent portions 17e and 17f that can be bent within an elastic displacement, and from the two bent portions 17e and 17f. The pair of sandwiching ribs (17g1, 17g2), (17g3, 17g4) are halfway upwardly extending horizontally and facing the two rectangular ribs 17bc, 17bd described above on the upper surface (inner surface). A rack portion in which two sets of circular teeth are formed, and the spring-engaging boss 17g5 is formed so as to face the spring-engaging boss 17b1, and two rack teeth 17g6 and 17g7 are formed on the lower surface (outer surface). 17g.

  At this time, when the two rack teeth 17g6 and 17g7 are formed on the outer surface of the rack portion 17g of the rack body 17 using a resin material with a molding die that can be separated vertically, the rack portion is substantially parallel to the fixed portion 17a. 17g is extended to form two rack teeth 17g6 and 17g7 on the outer surface of the rack portion 17g, and the rack portion 17g is bent within an elastic displacement so as to be substantially perpendicular to the fixed portion 17a. Bent portions 17e and 17f are formed at least between the fixed portion 17a and the rack portion 17g, so that the two rack teeth 17g6 and 17g7 formed on the outer surface of the rack portion 17g can be slid. Since it is not necessary to use a molding die, the cost of the molding die is reduced, and accordingly, the component cost of the rack body 17 is also reduced.

  4 (a) and 4 (b), after the rack body 17 is formed, the two bent portions 17e and 17f formed between the fixing portion 17a and the rack portion 17g are formed. When the rack portion 17g is bent toward the hanging portion 17b within the elastic displacement, the two rectangular ribs 17bc and 17bd formed between the fixed portion 17a and the two connecting pieces 17c and 17d are rack portions. The rack portion 17g is rigid in the feed direction (X direction) because it is engaged while being sandwiched between a pair of sandwiching ribs (17g1, 17g2), (17g3, 17g4) formed on the inner surface of 17g. The rack portion 17g can be maintained substantially perpendicular to the fixed portion 17a while facing the drooping portion 17b substantially in parallel, so that the rack portion 17g is formed on the outer surface of the rack portion 17g. 2 Spiral groove 23a of the rack teeth 17g6,17g7 lead screw 23 (FIG. 1, FIG. 2) becomes capable of meshing used state.

  Further, as shown in enlarged views in FIGS. 5A and 5B, the spring-engaging boss 17b1 formed on the hanging portion 17b of the rack body 17 and the spring-engaging surface formed on the inner surface of the rack portion 17g. An inclined surface is formed on the boss 17g5 so that the inner diameter of the compression coil spring 18 can be easily inserted. When the compression coil spring 18 is mounted between the spring-engaging bosses 17b1 and 17g5 of the rack body 17, the two rack teeth 17g6 formed on the outer surface of the rack portion 17g by the urging force of the compression coil spring 18 are provided. Since 17g7 is pressed toward the spiral groove 23a side of the lead screw 23 shown in FIGS. 1 and 2, the optical pickup 14 (FIG. 1) to which the rack body 17 is fixed can be moved linearly.

It is the perspective view which showed the optical pick-up feeder as an example of the linear moving apparatus which concerns on this invention. It is the perspective view which expanded and showed the feed mechanism part shown in FIG. (A), (b) is the perspective view which showed the shape at the time of shape | molding with the shaping | molding die which can isolate | separate a rack body up and down, respectively from the upper surface side and the lower surface side. (A), (b) is the perspective view which expanded and showed the use condition after bending the rack part of a rack body through a bending part so that the attitude | position substantially perpendicular | vertical with respect to a fixing | fixed part may be maintained. (A), (b) is an enlarged view of the state in which the compression coil spring is hooked between the spring hooking boss formed on the hanging portion of the rack body and the spring hooking boss formed on the inner surface of the rack portion. It is the perspective view shown. It is the perspective view which showed the optical pick-up feeder as an example of the conventional linear movement apparatus.

Explanation of symbols

10: Optical pickup feeding device,
11 ... Base, 12 ... Spindle motor, 13 ... Turntable,
14 ... optical pickup,
15, 16 ... first and second guide shafts,
17 ... rack body,
17a: fixing part, 17a1, 17a2 ... positioning boss, 17a3 ... mounting hole,
17b ... hanging part, 17b1 ... boss for spring latching,
17c, 17d ... two connecting pieces, 17bc, 17bd ... two rectangular ribs,
17e, 17f ... two bent portions,
17g ... rack part,
(17g1, 17g2), (17g3, 17g4) ... a pair of clamping ribs,
17g5 ... Boss for spring latching, 17g6, 17g7 ... Rack teeth,
18 ... compression coil spring,
20 ... feed mechanism, 21 ... bracket, 22 ... feed motor,
23 ... Lead screw, 23a ... Spiral groove,
D: Optical disc.

Claims (2)

A linearly movable carriage;
A rack body composed of a fixed portion that is integrally fixed to the carriage, and a rack portion that is maintained substantially perpendicular to the fixed portion and has rack teeth formed thereon;
In a linear movement device provided with a lead screw that is rotationally driven by a motor and that forms a spiral groove that meshes with the rack teeth,
In forming the rack portion of the rack body using a resin material with a molding die capable of separating the rack teeth vertically, the rack portion is extended substantially parallel to the fixed portion, and the rack portion is Forming rack teeth and forming a bent portion between the fixed portion and the rack portion for bending the rack portion in an elastic displacement so as to be in a posture substantially perpendicular to the fixed portion. A linear moving device characterized by the above. The linear moving device according to claim 1,
When the rack body is bent through the bent portion so that the rack portion is substantially perpendicular to the fixed portion, the rack body has rigidity in the feeding direction by the lead screw. A linear movement device characterized in that a rib for holding is formed so as to be engageable between the fixed portion and the rack portion.

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