JP2006134413A - Tilt angle adjusting device for optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the use of a screw for fixing the leaf spring while the leaf spring is used as substitute for a coil spring in a tilt angle adjustment device for an optical pickup. <P>SOLUTION: One point of an actuator 5 arranged on an optical bench 1 is pressed by resilient force of a spring body 6, tilt angle adjusting screws 7, 8 rotatably mounted in a designated position of the optical bench 1 are screwed into screw holes 51, 52 of the actuator 5. The actuator is tilted by rotating operation of the tilt angle adjusting screws 7, 8. The spring body 6 is constituted with the leaf spring, and a fitting part 61 of the leaf spring is inserted into an inserting hole 12 of the optical bench 1 and fixed. An action part 65 of the leaf spring can be formed in a spherical shape and overlaid on an opening rim 57 of the inserting hole 56 of a spring bearing piece 53. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tilt adjusting device for an optical pickup used in an optical recording / reproducing apparatus for performing recording or reproduction on a compact disk, an optical disk, or the like.

  The optical pickup has a function of irradiating a disk with laser light. If the irradiation direction of the laser light is not properly adjusted, optical aberrations occur and inconvenience such as a decrease in signal level occurs. Therefore, the manufacturing process of the optical pickup includes an inclination angle adjusting process that includes adjusting the irradiation direction of the laser beam appropriately with high accuracy.

  FIG. 5 is a schematic perspective view of an optical pickup employing a conventional tilt angle adjusting device. In this optical pickup, one place of the actuator 5 arranged on the optical bench 1 is elastically pressed in the direction approaching the optical bench 1 by the elastic force of the spring body 6, whereas two positions which are fixed positions of the optical bench are provided. The tilt angle adjusting screws 7 and 8 that are rotatably mounted on the actuator 5 are screwed into the screw holes 51 and 52 of the actuator 5.

  In this optical pickup, the optical bench 1 is provided with a spherical seat (not shown), and a spherical projection (not shown) provided in the actuator 5 is supported by the spherical seat so as to be tiltable. The locations where the spring body 6 is pressed against the actuator 5 and the locations where the tilt angle adjusting screws 7 and 8 are screwed are arranged eccentrically with respect to the spherical seat. The spring body 6 employs a coil spring, and the coil spring passes through a spring receiving piece 53 provided in the actuator 5 and an insertion hole (not shown) of the spring receiving piece 53. It is interposed in a compressed state between a head 55 of a headed screw 54 screwed in (not shown).

  In this optical pickup, when the tilt angle is adjusted, the actuator 5 is tilted by using the elastic force of the spring body 6 formed of a coil spring by rotating the tilt angle adjusting screws 7 and 8 at two locations.

  On the other hand, an inclination adjusting device using a leaf spring and an inclination adjusting screw has been known (see Patent Document 1). This corresponds to a substitute of the spring body 6 made of a coil spring described in FIG. 5 with a leaf spring fixed to the optical bench 1 with screws.

In addition, as a prior example related to the optical pickup, there is one using a leaf spring as an inclination adjusting mechanism for finely adjusting the angle of the rotating shaft of the disk motor for rotating the disk (see Patent Document 2), and loosening the inclination adjusting screw. Some use leaf springs to stop (see Patent Document 3).
JP 2001-357538 A Japanese Laid-Open Patent Publication No. 2004-30722 Japanese Laid-Open Patent Publication No. 2001-23179

  However, in the conventional example described with reference to FIG. 5, the spring body 6 is held on the spring receiving piece 53 of the actuator 5, and the spring body 6 is compressed and the elastic force of the spring body 6 is used to actuate the actuator. The head screw 54 is used to repress 5 in the direction approaching the optical bench 1, and the spring body 6 is a high-performance coil spring that is excellent in durability and hardly deteriorates in springiness. In addition to the fact that the spring body 6 is expensive, an extra head screw 54 is required, resulting in an increase in the number of parts, and a troublesome tightening process for the head screw 54 is required in the assembly process. As a result, the assembly process has become complicated. Furthermore, since the head screw 54 is manufactured using a mold, the price is relatively high.

  On the other hand, the thing of patent document 1 also has a screw required for the leaf | plate spring, and an extra screw is needed. For this reason, although a leaf spring that can be obtained at a lower cost than a coil spring is used, a troublesome tightening process of screws is also required in the assembly process.

  The present invention has been made in view of the above situation, and takes measures to eliminate the need for a screw for fixing the leaf spring, although a leaf spring is used instead of the coil spring described in FIG. Accordingly, it is an object of the present invention to provide an inclination adjustment device for an optical pickup at a low cost and to simplify the structure of the inclination adjustment device so as to improve assembly workability.

  In the tilt adjustment device for an optical pickup according to the present invention, one place of an actuator provided on an optical bench is elastically pressed in a direction approaching the optical bench by the elastic pressure of a spring body, and is rotatable to a fixed position of the optical bench. The actuator is tilted using the elastic force of the spring body by the rotation operation of the tilt angle adjusting screw that is installed and screwed into the screw hole of the actuator, and the spring body is provided in the actuator. A tilt adjustment device for an optical pickup comprising a coil spring interposed in a compressed state between a spring receiving piece and a head screw head screwed into a screw hole of the optical bench through an insertion hole of the spring receiving piece, The head screw is omitted, and the coil spring is changed to a leaf spring fixed by adopting a fixing structure that does not use a mounting screw on the optical bench. The working portion of the roots are superimposed in repression state the spring receiving piece.

  With this configuration, since the leaf spring is used in place of the conventional coil spring as the spring body for elastically pressing one place of the actuator, the cost of the spring body is not so low, and the spring body is optically Since it is fixed to the base with a fixing structure that does not use mounting screws, the structure of the tilt angle adjusting device is simplified compared to the prior art, and the mounting screw tightening process is eliminated from the assembly process, improving the assembly workability. As a whole, it becomes possible to provide an inclination adjusting device for an optical pickup at a low cost.

  In the present invention, as the fixing structure, it is desirable to employ a configuration in which the mounting piece provided on the leaf spring is locked by a locking claw provided on the optical bench.

  In the present invention, it is also possible to adopt a configuration in which the action portion of the leaf spring is formed in a spherical shape, and the action portion overlaps the edge of the insertion hole of the spring receiving piece. When this configuration is adopted, the situation in which the actuator is displaced in the horizontal direction at the location where the spring body is pressed is prevented, and the tilt angle adjustment accuracy is improved.

  In the tilt adjustment device for an optical pickup according to the present invention, one place of an actuator provided on an optical bench is elastically pressed in a direction approaching the optical bench by the elastic pressure of a spring body, and is rotatable to a fixed position of the optical bench. The actuator is tilted using the elastic force of the spring body by the rotation operation of the tilt angle adjusting screw that is installed and screwed into the screw hole of the actuator, and the spring body is provided in the actuator. An inclination adjustment device for an optical pickup comprising a coil spring interposed in a compressed state between the spring receiving piece and the head of the head screw screwed into the screw hole of the optical bench through the insertion hole of the spring receiving piece, The head screw is omitted, and the coil spring is provided with a mounting piece portion having a locking portion formed of an opening lip and the action portion extending from the mounting piece portion. It is changed to a leaf spring having a pressing piece portion, and the action portion of the leaf spring is overlapped with the spring receiving piece in an elastic state, and the attachment piece portion of the leaf spring is provided in the optical stand. When the locking claw provided on the optical bench side is locked to the locking portion of the mounting piece portion, the leaf spring is fixed to the optical bench, and the action of the leaf spring is The embodiment is further embodied by adopting a configuration in which the part is formed in a spherical shape and the action part overlaps with the mouth edge of the insertion hole of the spring receiving piece. The operation of the present invention will be described in detail with reference to the embodiments described later.

  As described above, according to the present invention, although a plate spring is used instead of the coil spring described in FIG. 5, a screw for fixing the plate spring is not necessary. At the same time, the structure of the tilt angle adjusting device is simplified, so that troublesome screw tightening work is eliminated and assembly workability is improved.

  1 is a schematic perspective view of an optical pickup that employs an inclination adjusting device according to the present invention, FIG. 2 is a cross-sectional view illustrating a fixing structure, and FIG. 3 is a cross-sectional view illustrating an example in which a spring body has a positioning function. 4 is a perspective view of a spring receiving piece.

  The optical pickup shown in FIG. 1 is elastically pressed in the direction in which one portion of the actuator 5 provided on the optical bench 1 approaches the optical bench 1 by the elastic pressure of the spring body 6 as in the conventional example described in FIG. On the other hand, the tilt angle adjusting screws 7 and 8 that are rotatably provided at two positions which are fixed positions of the optical bench are screwed into the screw holes 51 and 52 of the actuator 5, and the optical bench 1 includes A spherical seat not shown is provided, and a spherical projection (not shown) provided on the actuator 5 is supported by the spherical seat so as to be tiltable. , 8 are provided at eccentric positions with respect to the spherical seat.

  The optical pickup having this configuration is different from the conventional example described in FIG. 5 in that a plate spring is used for the spring body 6 and the spring body 6 made of the plate spring is fixed to the optical bench 1 without using mounting screws. The plate spring acting portion is only superposed on the spring receiving piece 53 of the actuator 5 in an elastic state. As shown in FIG. 4, the spring receiving piece 53 has an insertion hole 56, and this insertion hole 53 is originally formed to allow the headed screw 54 described in FIG. 5 to be inserted.

  As shown in FIG. 2 or FIG. 3, the leaf spring as the spring body 6 has an attachment piece 61 and a pressing piece 62 extending from one end of the attachment piece 61 in a substantially right angle direction. One piece 61 is provided with a locking portion 64 which is the lip of the opening 63. Then, the mounting piece 61 is inserted into the slit-like insertion hole 12 formed in the optical bench 1 and the locking portion 64 is locked to the locking claw 13 provided on the optical bench 1 side, whereby the spring body. A leaf spring 6 is fixed to the optical bench 1 so as not to move. Further, the action portion 65 provided in the pressing piece portion 62 is superimposed on the spring receiving piece 53 of the actuator 5 in an elastic state. Therefore, when the tilt angle adjusting screws 7 and 8 are rotated in the forward direction or the reverse direction, the actuator 5 is tilted by the elastic pressure of the spring body 6 or against the elastic pressure of the spring body 6. Adjustments are made.

  In the example of FIG. 2, the action part 65 of the pressing piece 62 of the spring body 6 is formed flat. However, as shown in FIG. 3, the action part 65 is made spherical by means such as press molding as shown in FIG. It may be formed and the action portion may be overlapped with the mouth edge 57 of the insertion hole 56 of the spring receiving piece 53 in an elastic state. In this way, the spherical action portion 56 prevents the spring receiving piece 53 from being displaced, so that the actuator 5 is prevented from being displaced and the tilt angle adjustment accuracy is improved. Further, as described above, the insertion hole 56 is originally formed to allow the head screw 54 described in FIG. 5 to pass therethrough. However, as in this example, the spherical action portion 56 is inserted. By adopting a structure in which the hole 56 is superimposed on the rim 57 of the hole 56 in an elastic state, there is an advantage that the insertion hole 56 can be effectively used for positioning.

1 is a schematic perspective view of an optical pickup that employs an inclination adjusting device according to the present invention. It is sectional drawing which illustrated the fixation structure. It is sectional drawing which shows the example which gave the positioning function to the spring body. It is a perspective view of a spring receiving piece. It is a schematic perspective view of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical stand 5 Actuator 6 Spring body 7,8 Inclination adjustment screw 12 Insertion hole 13 Locking claw 51,52 Screw hole 53 Spring receiving piece 54 Head screw 55 Head screw head 56 Insertion hole 57 Edge of insertion hole 61 Attaching piece 64 Locking part 65 Action part

Claims (4)

One part of the actuator arranged on the optical bench is elastically pressed in the direction approaching the optical bench by the elastic force of the spring body, and is rotatably mounted at a fixed position of the optical bench and screwed into the screw hole of the actuator. The actuator is tilted by using the elastic force of the spring body by rotating the tilt adjusting screw, and the spring body passes through a spring receiving piece provided in the actuator and an insertion hole of the spring receiving piece. In the tilt adjustment device of the optical pickup comprising a coil spring interposed in a compressed state between the head of the head screw screwed into the screw hole of the optical bench,
The head screw is omitted, and the coil spring includes an attachment piece portion having a locking portion formed by an opening lip, and a pressing piece portion extending from the attachment piece portion and provided with the action portion. The leaf spring is changed to a leaf spring, and the action portion of the leaf spring is superimposed on the spring receiving piece in an elastic state, and the attachment piece portion of the leaf spring is inserted into the insertion hole provided in the optical stand, and The plate spring is fixed to the optical table by the locking claw provided on the optical table side being locked to the locking part of the mounting piece.
An inclination adjusting device for an optical pickup, wherein the action portion of the leaf spring is formed in a spherical shape, and the action portion overlaps with a lip of an insertion hole of the spring receiving piece. One part of the actuator arranged on the optical bench is elastically pressed in the direction approaching the optical bench by the elastic force of the spring body, and is rotatably mounted at a fixed position of the optical bench and screwed into the screw hole of the actuator. The actuator is tilted by using the elastic force of the spring body by rotating the tilt adjusting screw, and the spring body passes through a spring receiving piece provided in the actuator and an insertion hole of the spring receiving piece. In the tilt adjustment device of the optical pickup comprising a coil spring interposed in a compressed state between the head of the head screw screwed into the screw hole of the optical bench,
The head screw is omitted, and the coil spring is changed to a leaf spring fixed by using a fixing structure that does not use a mounting screw on the optical bench, and the action portion of the leaf spring is changed to the spring receiving piece. An apparatus for adjusting the tilt angle of an optical pickup, characterized in that it is superposed on each other in an elastic state. The tilt adjustment device for an optical pickup according to claim 2, wherein the fixing structure is configured by locking an attachment piece provided on the leaf spring to a locking claw provided on an optical bench. 4. The tilt adjustment device for an optical pickup according to claim 3, wherein the action portion of the leaf spring is formed in a spherical shape, and the action portion overlaps with a lip of an insertion hole of the spring receiving piece.

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