JP2005310279A - Optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup which is capable of stopping resonance of an optical pickup system, which is caused by driving a lens. <P>SOLUTION: A yoke 10 built in an optical base of the optical pickup has a shape provided with an extension part 11 extending to an outer peripheral side. The weight of the yoke 10 is increased by this extension part 11, so that its vibration can be suppressed. As a result, resonance of the optical pickup system can be prevented, and track tracking performance can be improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup used in an optical disk reproducing apparatus that records and reproduces information signals by projecting laser light onto a disk.

  For example, Patent Document 1 discloses an optical pickup having a configuration in which a weight is mounted on a frame.

  A conventional optical pickup as a base for explaining the present invention will be described below.

  FIG. 4 is a perspective view showing a configuration of an optical pickup generally used conventionally. FIG. 5 is an enlarged perspective view showing a main part (yoke 48) of FIG.

In the drawing, the objective lens 41 is fixed to a lens holder 42. A coil substrate 43 that is driven in the focus direction and the tracking direction is attached to the lens holder 42. The coil substrate 43 has a soldering portion for supplying electricity, and four suspension wires 44a to 44d are fixed to the soldering portion of the coil substrate 43 fixed to the lens holder 42 by soldering. The other ends of the suspension wires 44 a to 44 d are held by soldering to a printed circuit board 46 fixed to the gel holder 45. The two permanent magnets 47 a and 47 b are fixed to the yoke 48 so as to sandwich the coil substrate 43. The yoke 48 is fixed to the bottom surface of the optical base 49. A separate part 40 for adding weight is incorporated in the optical base 49. The separate component 40 prevents resonance caused by vibration caused by lens driving.
JP-A-10-31830

  However, in the conventional configuration described above, the incorporation of another part for preventing the resonance of the optical pickup system has a problem in that efficient mass productivity is hindered.

  SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems and to provide an optical pickup capable of preventing resonance of an optical pickup system that does not depend on a molding method that hinders efficient mass productivity.

  In order to achieve this object, the optical pick according to the present invention includes a lens holder for holding an objective lens, a gel holder, a printed circuit board provided on the gel holder, and a vertical distance from both left and right sides of the printed circuit board. Extending from the suspension wire fixed to the coil substrate that is driven in the focus direction and the tracking direction, the other end of which is attached to the lens holder, a magnet for applying a magnetic field to the coil substrate, and a yoke on which the magnet is attached In this optical pickup, the gel holder and the yoke are fixed to the optical base, and the yoke extends to the outer peripheral side to increase the weight. With this configuration, it is possible to prevent resonance of the optical pick system that comes from lens driving.

  As described above, the present invention can prevent the resonance of the optical pickup system caused by lens driving, and provides an excellent effect of enabling efficient mass productivity.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

(Embodiment 1)
FIG. 1 is a perspective view showing a main part of an optical pickup according to Embodiment 1 of the present invention. FIG. 1 omits the configuration that is not directly related to the first embodiment, and the other configuration is the same as the configuration of the optical pickup shown in FIG.

  In FIG. 1, 10 is a yoke. Reference numeral 11 denotes a portion where the yoke 10 is extended. That is, the configuration of the yoke 48 is changed, and the yoke 48 is configured to extend outwardly for the addition of weight.

  Here, the extension part 11 of the yoke 10 shown in FIG. 1 is assembled and fixed so as to be accommodated in the optical base 49 shown in FIG. As a result, the moment of inertia of the optical pickup system increases, and the resonance of the system due to lens driving can be prevented.

(Embodiment 2)
FIG. 2 is a perspective view showing a main part of the optical pickup according to Embodiment 2 of the present invention. FIG. 2 omits the configuration that is not directly related to the second embodiment, and the other configuration is the same as the configuration of the optical pickup shown in FIG.

  In FIG. 2, reference numeral 12 denotes a portion extended to the yoke 10. That is, the configuration of the yoke 48 is changed to have a configuration extending in the outward direction for weight addition, and a configuration formed on the outer periphery.

  Here, the extension 12 of the yoke 10 shown in FIG. 2 is assembled and fixed to the optical base 49 shown in FIG. As a result, the moment of inertia of the optical pickup system increases, and the resonance of the system due to lens driving can be prevented.

(Embodiment 3)
FIG. 3 is a perspective view showing the main part of the optical pickup according to Embodiment 3 of the present invention. In FIG. 3, the configuration not directly related to the third embodiment is omitted, and the other configuration is the same as the configuration of the optical pickup shown in FIG.

  In FIG. 3, reference numeral 13 denotes a portion extended to the yoke 10. That is, the configuration of the yoke 48 is changed to have a configuration that extends outwardly for the addition of weight, and further has a folded configuration.

  Here, the extension 13 of the yoke 10 shown in FIG. 3 is assembled and fixed to the optical base 49 shown in FIG. As a result, the moment of inertia of the optical pickup system increases, and resonance of the optical pickup system due to lens driving can be prevented.

  As described above, according to each embodiment of the present invention, the extension portion 11, 12 or 13 extending to the outer peripheral side is provided on the yoke 10 incorporated in the optical base 49 of the optical pickup. The extension 11, 12, or 13 can increase the weight of the yoke 10 and suppress the vibration. As a result, resonance of the optical pickup system can be prevented, and track following performance can be improved.

  Moreover, the weight to add can be changed by improving the shape of the extension parts 11-13, or the ease of an assembly | attachment operation | work can be improved.

  The optical pickup according to the present invention is excellent in that it is possible to prevent the resonance of the optical pickup system due to lens driving and to enable efficient mass production by adopting a configuration that makes it easy to incorporate the weight increase of the yoke. It is useful as an optical disc reproducing device, a recording device, a recording / reproducing device, etc. for recording and reproducing information signals by projecting laser light onto the disc.

The perspective view which shows the principal part structure of the optical pick-up in Embodiment 1 of this invention. The perspective view which shows the principal part structure of the optical pick-up in the same Embodiment 2. The perspective view which shows the principal part structure of the optical pick-up in Embodiment 3 A perspective view showing a schematic configuration of a conventional optical pickup The perspective view which shows the principal part structure of the conventional optical pick-up

Explanation of symbols

10 Yoke 11-13 Extension

Claims (3)

A lens holder for holding the objective lens, a gel holder, a printed circuit board provided on the gel holder, and extending from the left and right sides of the printed circuit board in a vertical direction with the other end attached to the lens holder. A plurality of suspension wires fixed to a coil substrate that is driven in a focusing direction and a tracking direction, a magnet that applies a magnetic field to the coil substrate, and a yoke to which the magnet is attached. An optical pickup fixed to the optical base,
An optical pickup characterized in that the yoke extends outwardly for weight addition. 2. The optical pickup according to claim 1, wherein the yoke extends outwardly for weight addition and is formed on the outer periphery. 2. The optical pickup according to claim 1, wherein the yoke extends outward and is folded for weight addition.

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