JP2000276747A - Actuator for optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make avoidable a solder for fixing a suspension wire on a terminal plate fixed to a bobbin from sneaking into the outside terminal part of the terminal plate in a focusing direction by supplying/relaying a current to a coil for driving and forming a notched part at the outside terminal part of the terminal plate in the focusing direction. SOLUTION: A current is supplied and relayed to the driving coil, a terminal plate 10 fixed on the bobbin is extended from both the left and right sides of a suspension holder at intervals in the vertical direction, and the other terminal of a suspension wire 48 for supporting the bobbin so as to displace it is locked by soldering. A soldering plating is applied to a main plane on the outside of the terminal plate 10 and a notched part 11 is formed at the outside terminal part of the terminal plate 10 in the focusing direction. The other terminal of the suspension wire 48 is locked on the main plane of the terminal plate 10 by a solder 12, the length of the terminal plate 10 in the focusing direction is shortened by the notched part 11 formed at the outside terminal part of the terminal plate 10 in the focusing direction, and the solder 12 is prevented from sneaking into the outside terminal part of the terminal plate in the focusing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for an optical pickup used in an optical disc reproducing apparatus for recording and reproducing a disc by projecting laser light onto the disc.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing the structure of an optical pickup actuator generally used in the prior art. FIG. 5 is an enlarged perspective view showing a main part of FIG.

In FIG. 1, an objective lens 41 is fixed to a bobbin 42. A focus coil 43 for driving in the focus direction is wound around the bobbin 42, and tracking coils 44a and 44b for driving in the tracking direction on surfaces on both sides of the bobbin 42 perpendicular to the tracking direction.
Is wound. Two permanent magnets 45a, 45b
Are a focus coil 43 and a tracking coil 44
a, 44b are fixed to a fixed base 46 so as to sandwich the same. Terminal plates 47a to 47d for relaying a current for supplying electricity to the focus coil 43 and the tracking coils 44a and 44b are fixed to the bobbin 42 at upper and lower portions in the focus direction on both sides of the bobbin 42. 47
a to 47d are four suspension wires -48a to 4
The suspension wires 48a to 48d are fixed to the printed circuit board 40 fixed to the suspension holder 49 by soldering.

[0004] The terminal plate 47c is arranged on the opposite side of 47a,
The terminal plate 47d is arranged on the side facing 47b. Also,
The suspension wire 48c is arranged on the side facing 48a, and the suspension wire 48d is arranged on the side facing 48b.

[0005]

However, in the above-mentioned conventional configuration, as shown in FIG. 5, the suspension wires 48a to 48d, the focus coil 43 which is a driving coil, and the tracking coils 44a and 44b are connected by relay. In the soldering process of the terminal boards 47a to 47d,
The suspension wires 48a to 48d are connected to the terminal plates 47a to
When soldering to the terminal plates 47a to 47d, the solder 50 wraps around the end 51 in the focus direction outside the terminal plates 47a to 47d in order to fix to the fixed base 47d, which causes characteristic defects such as contact with the fixed base 46. In addition, an unnecessarily large amount of solder may be one factor that degrades actuator performance such as tracking performance. In order to solve this problem, the required accuracy with respect to solder specifications and the like at the time of soldering becomes strict, and there has been a problem that efficient mass productivity is hindered.

The present invention solves the above-mentioned conventional problems, and provides an actuator for an optical pickup in which solder for fixing a suspension wire to a terminal plate does not flow around an end portion in a focus direction outside the terminal plate. The purpose is to do.

[0007]

SUMMARY OF THE INVENTION To achieve this object, an actuator for an optical pickup according to the present invention comprises a bobbin for holding an objective lens, a suspension holder provided on a fixed base, and a bobbin. A driving coil for displacing in the focus direction and the tracking direction, a terminal plate fixed to the bobbin for supplying and relaying current to the driving coil, and extending vertically from both left and right sides of the suspension holder. An actuator for an optical pickup comprising a plurality of suspension wires having the other end fixed to a terminal plate and displaceably supporting a bobbin, wherein a notch is formed at an end in a focus direction outside the terminal plate. It has a formed configuration.

[0008] By forming the notch at the end in the focus direction outside the terminal board of this configuration, the solder for fixing the suspension wire to the terminal board does not go around the end in the focus direction outside the terminal board. It is.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a bobbin for holding an objective lens, a suspension holder provided on a fixed base, a direction of a focus attached to the bobbin, and A driving coil that displaces in the tracking direction, a terminal plate that supplies and relays a current to the driving coil, and that is fixed to the bobbin, extends vertically from both the left and right sides of the suspension holder, and the other end extends An actuator for an optical pickup comprising a plurality of suspension wires fixed to said terminal plate and supporting said bobbin so as to be displaceable, wherein a notch is formed at an end in a focus direction outside said terminal plate. The effect that the solder for fixing the suspension wire to the terminal board does not go around the end in the focus direction outside the terminal board A.

According to a second aspect of the present invention, there is provided a bobbin for holding an objective lens, a suspension holder provided on a fixed base, and a drive for displacing in a focus direction and a tracking direction attached to the bobbin. Coils and
A terminal plate that supplies and relays a current to the driving coil and is fixed to the bobbin, extends vertically from both left and right sides of the suspension holder, and the other end is fixed to the terminal plate to displace the bobbin. What is claimed is: 1. An actuator for an optical pickup comprising: a plurality of suspension wires supported so as to be capable of being soldered on a main direction of a main surface of said terminal plate in a focus direction side. This has the effect that the solder for fixing the wire to the terminal plate does not go around the end in the focus direction outside the terminal plate.

According to a third aspect of the present invention, there is provided a bobbin for holding an objective lens, a suspension holder provided on a fixed base, and a drive for displacing in a focus direction and a tracking direction attached to the bobbin. Coils and
A terminal plate that supplies and relays a current to the driving coil and is fixed to the bobbin, extends vertically from both left and right sides of the suspension holder, and the other end is fixed to the terminal plate to displace the bobbin. An actuator for an optical pickup, comprising: a plurality of suspension wires supported so as to be capable of being supported, wherein a main surface of the terminal plate is plated with solder, and one of the main surfaces of the terminal plate in a focus direction side. The portion eliminates the solder plating, and has an effect that the solder for fixing the suspension wire to the terminal plate does not go around the end in the focus direction outside the terminal plate.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

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

In FIG. 1A, reference numeral 10 denotes a terminal plate which supplies and relays a current to a driving coil and is fixed to a bobbin.
The terminal plate 10 extends from both left and right sides of the suspension holder 49 at an interval in the vertical direction, and the other end of the suspension wire 48 that supports the bobbin so as to be displaceable is locked by solder. The main plane of the terminal board 10 is plated with solder. Reference numeral 11 denotes a notch formed at an end of the terminal plate 10 in the focus direction.

Here, as shown in FIG. 1B, the other end of the suspension wire 48 is locked to the main plane of the terminal plate 10 by the solder 12.

At this time, the notch 11 formed at the end in the focus direction outside the terminal plate 10 allows the terminal plate 10
Is shorter than the other portions in the focus direction, so that the solder 12 for fixing the suspension wire 48 to the terminal plate 10 does not go around the end in the focus direction outside the terminal plate.

(Embodiment 2) FIG. 2 is a perspective view showing a main part of an actuator for an optical pickup according to Embodiment 2 of the present invention. FIG. 2 omits components not directly related to the second embodiment, and the other components are the same as those in FIG.

In FIG. 2A, reference numeral 20 denotes a terminal plate which supplies and relays a current to a driving coil and is fixed to a bobbin.
The terminal plate 20 extends vertically from both left and right sides of the suspension holder 49, and the other end of the suspension wire 48 that supports the bobbin so as to be displaceable is locked by solder. The main plane of the terminal board 20 is plated with solder. Reference numeral 21 denotes an application portion in which a resin material, which is a material that cannot be soldered, is applied on the focus direction side of the main plane of the terminal plate 10.

Here, as shown in FIG. 2B, the other end of the suspension wire 48 is locked to the main plane of the terminal plate 20 by the solder 22.

At this time, the length of the solderable area in the focus direction of the terminal plate 20 is shortened by the coating portion 21 formed on the side of the main plane of the terminal plate 20 in the focus direction. The solder 22 for fixing does not go around the end in the focus direction outside the terminal board.

(Embodiment 3) FIG. 3 is a perspective view showing a main part of an actuator for an optical pickup according to Embodiment 3 of the present invention. FIG. 3 omits components not directly related to the third embodiment, and the other components are the same as those in FIG.

In FIG. 3A, reference numeral 30 denotes a terminal plate which supplies and relays a current to the driving coil and is fixed to the bobbin.
The terminal plate 30 extends vertically from both left and right sides of the suspension holder 49, and the other end of the suspension wire 48 that supports the bobbin so as to be displaceable is locked by solder. The main plane of the terminal plate 30 is plated with solder. Reference numeral 31 denotes a non-homogeneous surface portion which is finished to a non-uniform surface by eliminating solder plating on the focus direction side of the main plane of the terminal plate 30.

Here, as shown in FIG. 3B, the other end of the suspension wire 48 is locked to the main plane of the terminal plate 30 by the solder 32.

At this time, the length of the solderable area in the focus direction of the terminal plate 30 is shortened by the non-homogeneous surface portion 31 formed on the side of the main plane of the terminal plate 30 in the focus direction, and the suspension wires 48 The solder 32 for fixing to the terminal 30 does not go around the end in the focus direction outside the terminal board.

[0025]

As described above, the present invention has an excellent effect that the solder for fixing the suspension wire to the terminal plate does not go around the end in the focus direction outside the terminal plate.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an actuator for an optical pickup according to a first embodiment of the present invention;

FIG. 2 is a perspective view showing a main part of an actuator for an optical pickup according to a second embodiment of the present invention;

FIG. 3 is a perspective view showing a main part of an actuator for an optical pickup according to a third embodiment of the present invention;

FIG. 4 is a perspective view showing a main part of a conventional actuator for an optical pickup.

FIG. 5 is a perspective view showing a main part of a conventional actuator for an optical pickup.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Terminal board 11 Notch part 12 Solder 20 Terminal board 21 Coating part 22 Solder 30 Terminal board 31 Inhomogeneous surface part 32 Solder

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Tetsufumi Hashimoto 1006 Kazuma Kadoma, Kadoma City, Osaka F-term in Matsushita Electric Industrial Co., Ltd. (reference) 5D118 AA06 BA01 DC03 FC07

Claims (3)

[Claims] 1. A bobbin for holding an objective lens, a suspension holder provided on a fixed base, a driving coil mounted on the bobbin for displacing in a focusing direction and a tracking direction, and the driving coil A terminal plate that supplies and relays current to the bobbin, and extends vertically from both left and right sides of the suspension holder at an interval in the vertical direction, and the other end is fixed to the terminal plate to displaceably support the bobbin. An actuator for an optical pickup comprising a plurality of suspension wires,
An actuator for an optical pickup, wherein a notch is formed at an end in a focus direction outside the terminal plate.
Ta. 2. A bobbin for holding an objective lens, a suspension holder provided on a fixed base, a driving coil attached to the bobbin for displacing in a focusing direction and a tracking direction, and the driving coil. A terminal plate fixedly connected to the bobbin for supplying current to the bobbin, extending vertically from both left and right sides of the suspension holder, and the other end is fixed to the terminal plate to displaceably support the bobbin. An actuator for an optical pickup comprising a plurality of suspension wires,
An actuator for an optical pickup, wherein a material that cannot be soldered is applied to a focus direction side of a main plane of the terminal plate. 3. A bobbin for holding an objective lens, a suspension holder provided on a fixed base, a driving coil mounted on the bobbin for displacing in a focusing direction and a tracking direction, and the driving coil. A terminal plate fixedly connected to the bobbin for supplying current to the bobbin, extending vertically from both left and right sides of the suspension holder, and the other end is fixed to the terminal plate to displaceably support the bobbin. An actuator for an optical pickup comprising a plurality of suspension wires,
An actuator for an optical pickup, wherein a solder plating is formed on a main surface of the terminal plate, and a part of the main surface of the terminal plate on a focus direction side is excluded from the solder plating.