JP2012155812A - Travel guiding apparatus for optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable fitting of a sub-guide shaft to a guide bearing of a sub-shaft side travel guiding mechanism for an optical pickup in a radial direction, and enable smooth fitting of a support shaft to the guide bearing in an axial direction of the guide bearing.SOLUTION: In the travel guiding apparatus for the optical pickup including a main-shaft side travel guiding mechanism A and a sub-shaft side guiding mechanism B which guide travel of an optical pickup 10, the sub-shaft side guiding mechanism B has a guide bearing 22, and a spring body 50 for bringing the wall surface of a bearing hole 24 into elastic contact with a side-guide shaft 42, the bearing hole 24 is formed of a recessed portion, and the spring body 50 includes an action piece 52 in an inclined posture, and a guide piece 54.

Description

  The present invention relates to a travel guide device for an optical pickup used for optically processing a recording surface of a disk as a recording medium.

  This type of optical pickup is configured by attaching an optical actuator including an objective lens and electromagnetic driving means to an optical base on which a light emitting element, a light receiving element, a mirror, and other optical components are assembled. In a general optical pickup, traveling of the optical base is guided in the radial direction of the disk by a main guide shaft and a sub guide shaft.

  FIG. 6 is a schematic explanatory view showing in principle the main shaft side travel guide mechanism A and the sub shaft side guide mechanism B, which is employed to guide the optical pickup 10 in the radial direction of a disk (not shown). It is. In the optical pickup 10 shown in the figure, a guide bearing 21 corresponding to a main guide shaft 41 and a guide bearing 22 corresponding to a sub guide shaft 42 having a circular cross section are provided on an optical base 20 in which an optical actuator (not shown) is assembled. It is provided integrally.

  In the main shaft side guide mechanism A shown in FIG. 6, the guide bearing 21 is provided with a circular bearing hole 23, and the main guide shaft 41 having a circular cross section is fitted into the bearing hole 23 so as to be relatively slidable. Has been. On the other hand, in the auxiliary shaft side guide mechanism B shown in the figure, the bearing hole 24 of the guide bearing 22 is orthogonal to the traveling direction of the optical base 20, in other words, the axial direction of the main guide shaft 41 and the auxiliary guide shaft 42. The sub-guide shaft 42 is slidably fitted in such a bearing hole 24, which is formed by a concave recess that opens outward. The spring body 50 attached to the optical base 20 side at the side position in the axial direction of the guide bearing 22 (one side position in the axial direction of the guide bearing 22) represses the sub guide shaft 42 in the radial direction. The wall surface (upper wall surface) of the bearing hole 24 formed as a hollow is elastically contacted with the sub guide shaft 42. In the figure, an arrow F indicates the direction of the elastic pressure in which the wall surface of the bearing hole 24 is brought into elastic contact with the sub guide shaft 42.

  According to the auxiliary shaft side travel guide mechanism B described here, the wall surface of the bearing hole 24 is always in elastic contact with the auxiliary guide shaft 42 by the elastic force of the spring body 50. Even if there is a gap between them, the traveling of the optical pickup 10 is smoothly guided in the axial direction Y of the sub guide shaft 42 (see FIG. 8) regardless of this.

  7 is a schematic perspective view of a leaf spring that can be used as the spring body 50 shown in FIG. 6. FIG. 8 shows the optical pickup 10 in which the leaf spring of FIG.

  A plate spring shown in FIG. 7 is employed as the spring body 50 in the auxiliary shaft side travel guide mechanism B employed in the travel guide device of the optical pickup 10 according to the conventional example. In the spring body 50 made of a leaf spring in the figure, an action piece 52 in an inclined posture having an upward slope is connected to one end of an elongated attachment piece 51 in a folded shape, and the action piece 52 has a longitudinal direction. An extending bulging reinforcing portion 53 is formed.

  As shown in FIG. 8, the optical pickup 10 is formed by assembling an optical actuator 30 to an optical base 20. Further, on both sides of the optical actuator 30, a guide bearing 21 of the main shaft side travel guide mechanism A and a guide bearing 22 of the sub shaft side travel guide mechanism B are provided integrally with the optical base 20. Furthermore, a spring body 50 made of a leaf spring having the shape shown in FIG. 7 is attached to the optical base 20. As can be understood from FIG. 8, the spring body 50 attached to the optical base 20 has a recessed recess in which the action piece 52 in the inclined posture forms the bearing hole 24 (see FIG. 6) of the guide bearing 22. It has an upward gradient from the opening 25 side toward the depth direction.

  FIG. 8 shows a step of inserting the guide bearing 22 of the secondary shaft side travel guide mechanism B into a secondary guide shaft 42 installed on a fixed side frame (not shown) called a mechanical chassis. In this step, as shown by an arrow X in the figure, the sub-guide shaft is inserted into the bearing hole 24 (see FIG. 6) of the guide bearing 22 by utilizing the opening 25 of the concave recess formed outward in the guide bearing 22. Inserting 42 in the radial direction is performed.

  9A and 9B illustrate a series of the above steps. In the state shown in FIG. 6A, the action piece 52 in the inclined posture provided in the spring body 50 is inclined upward in the depth direction from the opening 25 side of the recess that forms the bearing hole 24 of the guide bearing 22. have. Further, the outward opening 25 of the bearing hole 24 of the guide bearing 2 faces the sub guide shaft 42 from the radial direction. From this state, as indicated by an arrow X, the sub guide shaft 42 is inserted into the bearing hole 24 of the guide bearing 22 in the radial direction using the opening 25 of the guide bearing 22 of the optical pickup 10, and FIG. Thus, the sub guide shaft 42 is fitted into the bearing hole 24. In the state of FIG. 5B, the sub guide shaft 42 pushes down the action piece 52 against the elasticity of the spring body 50. Therefore, the wall surface of the bearing hole 24 is elastically contacted with the sub guide shaft 42 as indicated by the arrow F by the restoring force of the action piece 52.

  In the above process, when the sub guide shaft 42 is inserted into the bearing hole 24 of the guide bearing 22 in the radial direction, the sub guide shaft 42 comes into sliding contact with the action piece 52 in the inclined posture of the spring body 50 and the action piece. It is inserted into the bearing hole 24 while pushing down 52. Therefore, the spring body 50 is not disturbed in the process, and it is not necessary for the operator to manually push down the action piece 52 of the spring body 50. Can be done without.

  By the way, in the assembly process and maintenance process (referred to as both assembly processes) of the optical pickup itself, the guide bearings 21 and 22 of the travel guide mechanisms A and B on the main shaft side and the sub shaft side of the optical base are used. Thus, necessary work may be performed in a state where the optical base 20 is supported so as not to move by the support shaft on the fixed side. As the support shaft, a round bar having the same diameter as that of the main guide shaft 41 or the sub guide shaft 42 described above can be used, and by doing so, the support shaft is fitted to the guide bearings 21 and 22 without rattling. This is advantageous.

  FIG. 10 is an exploded perspective view showing a pair of fixed support shafts 61 and 62 and the optical pickup 10 used in the assembly process. 11A and 11B are explanatory views showing a series of steps for inserting the support shaft 62 into the guide bearing 22 performed prior to the assembly step.

  In the insertion step, it is possible to insert the support shaft 61 on one side in the axial direction Y1 (see FIG. 10) into the guide bearing 21 of the main shaft side travel guide mechanism A without any trouble.

  However, depending on the three-way positional relationship between the support shaft 62 on the other side, the guide bearing 22 of the auxiliary shaft side travel guide mechanism B, and the action piece 52 of the spring body 50 as shown in FIG. 10 or FIG. As can be seen, when the support shaft 62 is inserted into the guide bearing 22 in the axial direction Y2 (see FIG. 10), it crosses the bearing hole 24 at the side position of the guide bearing 22 as shown in FIG. Since the end 63 of the support shaft 62 abuts against the action piece 52 of the spring body 50 positioned in this manner, the action piece 52 becomes an obstacle. Therefore, it is necessary to insert the support shaft 62 into the guide bearing 22 by creating a state in which the operator artificially pushes down the action piece 52 of the spring body 50 to an unobstructed position.

  On the other hand, as a prior example, when exchanging the objective lens of the optical pickup, it has been proposed to support the holder by inserting a rod-shaped engagement portion into the hole of the holder of the objective lens (for example, Patent Documents). 1). As a previous example, there has been proposed a suspension erection device for easily erected a linear suspension for supporting an actuator movable part formed of a lens holder that holds an objective lens so as to be displaceable. (For example, refer to Patent Document 2). In still another prior example, there is a description of an assembly jig for a shaft sliding type optical pickup device (see, for example, Patent Document 3). In addition, research for increasing the mounting accuracy of a magnet, which is an optical pickup component, has been performed (see, for example, Patent Document 4 and Patent Document 5).

JP 2006-107654 A JP 2003-162833 A JP-A-10-27351 JP 2001-1108098 A JP 2005-332531 A

  As described above, according to the auxiliary shaft side traveling guide mechanism B of the optical pickup according to the conventional example, the auxiliary guide shaft 42 is formed in the bearing hole 24 of the guide bearing 22 as described with reference to FIG. 8 or FIG. Is inserted into the bearing hole 24 while pushing down the action piece 52 in the inclined posture of the spring body 50, the spring body 50 becomes obstructed or the action piece 52 is deformed. Never do. However, as described with reference to FIG. 10 or FIG. 11A, when the support shaft 62 is inserted into the guide bearing 22 in the axial direction Y2 (see FIG. 10), the action piece 52 of the spring body 50 is applied to the action piece 52. The end 63 of the support shaft 62 comes into contact with the working piece 52. For this reason, an extra work that requires the operator to manually push the action piece 52 of the spring body 50 to an unobstructed position is necessary. There was a possibility of causing a situation in which the action piece is abutted against the action piece 52 and is deformed.

  The present invention has been made in view of the above circumstances, and is based on the use of a spring body having an action piece in an inclined posture as illustrated in FIG. The auxiliary guide shaft can be inserted in the radial direction, and the operator manually pushes down the action piece of the spring body, or the end of the support shaft hits the action piece. Accordingly, an object of the present invention is to provide a travel guide device for an optical pickup that can smoothly insert and fit a support shaft into the guide bearing in the axial direction of the guide bearing.

  A travel guide device for an optical pickup according to the present invention includes a main shaft side travel guide mechanism and a sub shaft side guide mechanism that guide the travel of an optical base of an optical pickup having a function of scanning a recording surface of a disk as a recording medium. ing.

  The auxiliary shaft side guide mechanism elastically compresses the guide bearing provided in the optical base and the auxiliary guide shaft fitted in a bearing hole of the guide bearing in a slidable manner in the radial direction thereof. A spring body for elastically contacting the wall surface of the hole with the sub guide shaft, and the spring body is attached to the optical base at a side position in the axial direction of the guide bearing. Further, the bearing hole is formed by a hollow recess having an opening into which the auxiliary guide shaft can be inserted in the radial direction, and the spring body has an upward gradient from the opening side of the hollow recess toward the depth direction. In this manner, the acting piece is resisted against the elasticity of the spring body through an operation in which the acting piece elastically contacted with the sub guide shaft and the end of the support shaft inserted into the bearing hole from the axial direction are slidably contacted. And a guide piece that causes the support shaft to ride on the action piece by being pushed down.

  According to the travel guide device having this configuration, when the sub guide shaft is inserted in the bearing hole of the guide bearing of the sub shaft side travel guide mechanism in the radial direction, the sub guide shaft pushes down the acting piece of the inclined posture of the spring body. However, it is smoothly inserted into the bearing hole. Further, when the support shaft is inserted into the bearing hole of the guide bearing of the auxiliary shaft side travel guide mechanism in the axial direction, the action piece in which the end portion of the support shaft is in sliding contact with the guide piece is pushed down against the elasticity of the spring body. Since the support shaft rides on the action piece, the action piece does not get in the way, or the end of the support shaft hits the action piece and the action piece is not deformed. Further, it is not necessary for the operator to manually perform the operation of pushing down the action piece of the spring body.

  In the present invention, it is desirable that the guide piece is bent and formed in a tip-down shape at an end edge portion on one side in the width direction of the working piece. When this configuration is adopted, since the guide piece is integrally connected to the action piece, it is not necessary to configure the guide piece as a separate part, and the number of parts does not have to be increased.

  In the present invention, the spring body includes an attachment piece fixed to the optical base, the action piece extending in a folded shape from one end of the attachment piece, and the guide piece. Is desirable. With this configuration, the spring body can be attached to the optical base in the same form as the conventional example shown in FIG.

  According to the present invention, the auxiliary guide shaft can be smoothly inserted and fitted in the radial direction with respect to the guide bearing of the auxiliary shaft side travel guide mechanism. In addition, despite the fact that the spring body has an action piece in an inclined posture, an operator may manually push down the action piece, or the end of the support shaft may abut against the action piece. Thus, an effect is achieved that the support shaft can be smoothly inserted and fitted into the guide bearing in the axial direction of the guide bearing.

1 is a schematic perspective view of an optical pickup provided with a travel guide device according to an embodiment of the present invention. It is a perspective view of a spring body. It is sectional drawing of the part which follows the III-III line of FIG. (A) and (B) are explanatory views showing a series of steps for inserting and fitting the guide bearing of the auxiliary shaft side travel guide device into the auxiliary guide shaft. (A), (B), (C), and (D) are explanatory views showing a series of insertion steps of the support shaft performed prior to the assembly step of the optical pickup. It is the schematic explanatory drawing which showed in principle the main shaft side travel guide mechanism and the sub shaft side guide mechanism of the optical pickup. It is a schematic perspective view of the leaf | plate spring which can be employ | adopted as a spring body of FIG. It is a schematic perspective view of the optical pick-up which employ | adopted the leaf | plate spring of FIG. 7 as a spring body. (A) and (B) are explanatory views showing a series of steps for inserting and fitting the guide bearing of the auxiliary shaft side travel guide device into the auxiliary guide shaft. 2 is an exploded perspective view showing a support shaft and an optical pickup 10. FIG. (A) (B) is explanatory drawing which showed a series of insertion processes of the support shaft performed prior to an assembly process.

  FIG. 1 is a schematic perspective view of an optical pickup 10 provided with a travel guide apparatus according to an embodiment of the present invention. 2 is a perspective view of the spring body 50, and FIG. 3 is a cross-sectional view of a portion taken along line III-III in FIG. Further, FIGS. 4A and 4B are explanatory views showing a series of steps for fitting the guide bearing 22 of the auxiliary shaft side travel guide device B to the auxiliary guide shaft 42, as shown in FIGS. B, (C), and (D) are explanatory views showing a series of insertion steps of the support shaft 61 performed prior to the assembly step of the optical pickup 10.

  As shown in FIG. 1, the optical pickup 10 includes an optical base 30 and an optical actuator 30 assembled thereto. Further, on both sides of the optical actuator 30, a guide bearing 21 of the main shaft side travel guide mechanism A and a guide bearing 22 of the sub shaft side travel guide mechanism B are provided integrally with the optical base 20. A spring body 50 made of a leaf spring having the shape shown in FIG. 2 is attached to the optical base 20.

  The spring body 50 made of a leaf spring in FIG. 2 is formed by connecting an action piece 52 in an inclined posture having an upward slope to one end of an elongated attachment piece 51 in a folded shape. As shown in FIG. 3, the action piece 52 is formed with a bulging reinforcing portion 53 extending in the longitudinal direction. Furthermore, a tongue-like guide piece 54 is bent and formed in a tip-down shape at the edge of one side in the width direction of the action piece 52. As shown in FIG. 4A, the spring body 50 is attached to the mounting seat portion 26 of the optical base 20 so that the mounting piece portion 51 is a side portion in the axial direction of the guide bearing 22. And the action piece 52 of the inclined posture of the spring body 50 is an ascending gradient in the depth direction from the opening 25 side of the recess that forms the bearing hole 24 at the side of the bearing hole 24 of the guide bearing 22. have.

  4 (A) and 4 (B), the guide bearing 22 of the secondary shaft side travel guide mechanism B is inserted into a secondary guide shaft 42 installed on a fixed side frame (not shown) called a mechanical chassis and fitted. The insertion process to be performed will be described.

  In this insertion step, as shown by an arrow X in FIG. 4A, the sub guide shaft is inserted into the bearing hole 24 of the guide bearing 22 by using the opening 25 of the recessed recess formed outward in the guide bearing 22. Inserting 42 in the radial direction is performed. In this insertion step, the auxiliary guide shaft 42 slides against the action piece 52 in an inclined posture against the elasticity of the spring body 50 and pushes down the action piece 52 while smoothly moving into the bearing hole 24 as shown in FIG. Inserted. Therefore, the wall surface of the bearing hole 24 is elastically brought into contact with the auxiliary guide shaft 42 fitted in the bearing hole 24 as indicated by an arrow F in FIG. Further, when the auxiliary guide shaft 42 is inserted into the bearing hole 24 of the guide bearing 22, the spring body 50 is not disturbed, and the operator manually pushes down the action piece 52 of the spring body 50. There is no need to do it.

  On the other hand, a series of steps of inserting the support shaft 62 into the guide bearing 22 performed prior to the assembly step of the optical pickup 10 is performed as shown in FIGS. That is, when the support shaft 62 opposed to the bearing hole 24 of the guide bearing 22 as shown in FIG. 5A is inserted in the axial direction, the support shaft is inserted into the guide piece 54 of the spring body 50 as shown in FIG. After the end portion 62 of the contact 62 comes into contact, the support shaft 62 slides on the guide piece 54 and pushes down the action piece 52 together with the guide piece 54 against the elasticity of the spring body 50 as shown in FIG. The support shaft 62 rides on the action piece 52. Therefore, as shown in FIG. 5D, the support shaft 62 is smoothly inserted into the bearing hole 24 of the guide bearing 22 in the axial direction, and the action piece 52 becomes obstructed or the action piece 52 is supported by the support shaft 61. This prevents a situation in which the end portion 62 abuts and the action piece 52 is deformed. Further, it is not necessary for the operator to manually perform the operation of pushing down the action piece of the spring body.

  In FIG. 1 to FIG. 11, for convenience of explanation, the same or corresponding elements are denoted by the same reference numerals.

A Main shaft side travel guide mechanism B Sub shaft side travel guide mechanism X Radial direction of sub guide shaft Y Axial direction of sub guide shaft Y2 Axial direction of guide bearing 10 Optical pickup 20 Optical base 22 Guide bearing 24 Bearing hole 25 Recessed recess Opening 42 Sub guide shaft 50 Spring body 51 Guide piece 52 Action piece

Claims (3)

A main shaft side traveling guide mechanism and a sub shaft side guiding mechanism for guiding the traveling of the optical base of the optical pickup having a function of scanning the recording surface of a disk as a recording medium;
The auxiliary shaft side guide mechanism elastically presses the guide bearing provided in the optical base and the auxiliary guide shaft fitted in the bearing hole of the guide bearing so as to be relatively slidable in the radial direction thereof. And a spring body for elastically contacting the wall surface with the sub-guide shaft, and the spring body is attached to the optical base at a side position in the axial direction of the guide bearing. ,
The bearing hole is formed by a hollow recess having an opening into which the sub guide shaft can be inserted in a radial direction,
An action piece in an inclined posture in which the spring body is elastically contacted with the sub guide shaft with an upward gradient from the opening side of the recess to the depth direction;
By pushing down the action piece against the elasticity of the spring body through an operation of slidingly contacting the end of the support shaft inserted from the axial direction into the bearing hole, the support shaft rides on the action piece. An optical pickup travel guide device comprising: a guide piece.   The travel guide device for an optical pickup according to claim 1, wherein the guide piece is bent into a tip-down shape at an edge portion on one side in the width direction of the action piece.   The said spring body is provided with the attachment piece part fixed to the said optical base, the said action piece extended in the folded shape from the one end part of this attachment piece part, and the said guide piece. Item 3. A travel guide device for an optical pickup according to item 2.

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