JP2571323Y2 - Objective lens drive - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup used in an optical disk recording / reproducing apparatus, and to an objective lens driving apparatus for driving an objective lens following an information track of the disk.

[0002]

2. Description of the Related Art In an objective lens driving device for an optical pickup, four metal wires are used as a support system of a lens holder for holding an objective lens, and one end is fixed to a lens holder and the other end is fixed to a fixed portion side. Conventionally, a method of supporting a lens holder so as to be movable in the focus and tracking directions of a disc has been often used.
The major feature of this method is that a metal wire also serves as an electrical connection for electrically guiding a drive coil provided on a movable portion to a fixed portion side, and both ends of the wire are usually fixed by soldering.

FIG. 3 is a perspective view showing a conventional objective lens driving device, wherein 1 is an objective lens, 2 is a lens holder,
Denotes a focus coil, 4a and 4b denote tracking coils, 5a to 5d denote wires, 6a and 6b denote printed boards provided on the lens holder 2, and 7 denotes a printed board provided on the fixed part side. Both ends of the wires 5a to 5d are soldered to the printed boards 6a, 6b and 7, respectively.

[0004] In the conventional objective lens driving device configured as described above, the lens holder 2 can be driven in two directions of focus and tracking by supplying power from the wire fixing land of the printed circuit board on the fixing portion side.

[0005]

However, at this time, since both ends of the wires 5a to 5d are usually free before soldering, if the amount of protrusion of the wires toward the printed circuit board 7 is small, the soldering is not performed. It becomes stable and causes poor conduction. On the other hand, if the amount of protrusion is too large, the wire length on the opposite side, that is, on the side of the printed circuit boards 6a and 6b becomes short,
The soldering here becomes unstable.

[0006] For this reason, the wire 5 is visually inspected or jigs are used.
It is necessary to make the protrusion amounts of a to 5d uniform, but it takes a lot of man-hours and becomes a major obstacle in automation. As a means for improving this, a stopper 8 is attached to the lens holder 2 as shown in FIG.
Although a method of providing positions a and 8b to regulate the positions of the wires 5a to 5d is conceivable, the lens holder 2 also tends to be miniaturized with the miniaturization of the optical pickup. Printed circuit boards 6a, 6
There is a problem that the workability during the soldering work with b becomes difficult.

As another problem, the diameter of the wire through holes 9a to 9d of the printed circuit board 7 is usually φ0.
Since the diameter of the wires 5a to 5d is usually about 0.1 to 0.15 (see FIG. 5), the gap between the solder lands 10a to 10d of the printed circuit board 7 and the wires 5a to 5d is about 7 mm. Large, and tunnel solder is likely to occur.

[0008]

According to the present invention, the wire fixing portion is bent to solve the above-mentioned conventional problems.

[0009]

According to the present invention, since the fixed portion of the wire is bent, when soldering the wire, tunnel solder is hardly generated, and the amount of protrusion of the wire on the lens holder side can be made constant. The workability and reliability of attachment are improved, and an objective lens driving device with high productivity can be supplied.

[0010]

FIG. 1 shows an objective lens driving device according to an embodiment of the present invention, and all the reference numerals are the same as those of the conventional objective lens driving device shown in FIG. The fixed portions of the wires 5a to 5d are bent at approximately 1 mm at a substantially right angle at the tip.

The optical pickup configured as described above will be described below. FIG. 2 shows an assembling example of the objective lens driving device according to the present embodiment shown in FIG. 1. A jig is mounted on the yoke base 11 and the lens holder 2 as fixing parts so that the printed board 7 on the fixing part side is on the upper side. (Not shown). After this, the tip is bent in advance and wires 5a to
5d is inserted from above, penetrated through the lens holder 2, and the printed circuit board 7 and the wires 5a to 5d are soldered.

At this time, since the bent ends of the wires 5a to 5d are in contact with the soldering lands of the printed circuit board 7, soldering failure due to the gap between the wires and the lands is unlikely to occur. Can be significantly improved.

Also, since one end of the wire is inserted in a bent state by a certain amount, the amount of protrusion of the wire to the printed circuit boards 6a and 6b on the lens holder 2 side is also constant, and the amount of protrusion of the wire as in the prior art is too small. This can also prevent solder failure due to the above.

As described above, according to this embodiment, the soldering between the wire and the printed circuit board can be stabilized.
The performance and reliability of the objective lens driving device can be improved.

[0015]

As described above, according to the present invention, the fixed portion side of the metal wire supported by the movable portion is bent and then assembled and soldered. The movable part side can keep the amount of wire projection on the printed circuit board constant, so there is no soldering failure such as tunnel soldering, and it can also be used for automation in the wire insertion process It is possible to realize an objective lens driving device which is sufficiently compatible and has excellent mass productivity and reliability.

[Brief description of the drawings]

FIG. 1 is a perspective view of an objective lens driving device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of a conventional objective lens driving device.

FIG. 4 is a perspective view of the same.

FIG. 5 is a perspective view of a printed circuit board portion of a conventional objective lens driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 5a-5d Wire 6a, 6b Printed board on lens holder side 7 Printed board on fixed part side 9a-9d Through hole of printed board 10a-10d Soldering land 11 Yoke base

Claims (1)

(57) [Scope of request for utility model registration] 1. A movable part for holding an objective lens, at least four or more metal wires for supporting the movable part, a fixed part for fixing one end of the metal wire, and driving means for driving the movable part. An objective lens driving device, comprising: a fixing portion side of the metal wire, which is bent and soldered to a printed board provided on the fixing portion.