JPH1027362A - Objective lens drive - Google Patents

Abstract

(57) Abstract: In a coil moving type objective lens driving device, a structure in which a conductive spring supporting a lens holder is stably connected to a terminal plate to which a terminal of a coil wound around the lens holder is connected. It is an object of the present invention to provide an objective lens driving device. A terminal plate (5) attached to a lens holder (2).
First and second protrusions 5b and 5c protruding in the same direction.
The terminal of the focus coil or the tracking coil is connected to the first protrusion 5b, and the conductive spring material 6 for swingably supporting the lens holder 2 is connected to the second protrusion 5c.
Fixed to

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an objective lens driving device which constitutes a part of an optical pickup which performs recording and reproduction by projecting a light spot on a disk.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional objective lens driving device. Reference numeral 21 denotes an objective lens, and reference numeral 22 denotes a rectangular parallelepiped lens holder that holds the objective lens 21. The lens holder 22 is provided with a focus coil 23 at a substantially central portion of a side surface around an axis perpendicular to the disk, and two tracking coils 24 around an axis parallel to the disk and on both sides of the objective lens 21. Is equipped.

[0003] Both ends of the four metal wire springs 26 are fixed by soldering to four terminal plates 25 fixed to the lens holder 22 and a holder substrate 27 on the fixed side. Tracking direction 3
5 and cantilevered to be movable in two directions.

A terminal plate 25 is connected by soldering to both ends of a focus coil 23 and both ends of a tracking coil 24, which is two but continuous coil windings. Can supply current to each coil.

Reference numeral 29 denotes a holder for holding the four metal wire springs 26 in order to determine their positions. Reference numeral 28 denotes a silicon-based gel which is filled in a container provided in the holder 29 and then gelled by irradiation of ultraviolet rays. The movable gel including the lens holder 22 is provided by braking the movement of the metal wire spring 26. Damping the primary resonance vibration of the part.

Reference numeral 30 denotes a yoke base, a base 30a having a surface parallel to the disk, and a base 3a.
0a and a plate-like outer yoke 30b and an inner yoke 30 arranged perpendicular to the disk so as to protrude from the disk side.
and c are integrally formed.

A magnet 31 magnetized one by one in the thickness direction is fixed to the outer yoke 30b with the N pole opposed to each other, and the magnet 31 is further opposed to the inner yoke 30c to form a magnetic gap. By inserting a part of the focus coil 23 into the magnetic gap and making a part of the tracking coil 24 face the magnet 31, the movable part including the objective lens 21 is
It is driven in two directions: a focus direction 34 perpendicular to the disk and a tracking direction 35 parallel to the disk. Holder 29 and fixed-side holder substrate 27
Are fixed to the outer yoke 30b by screws 32.

The conventional objective lens driving device having the above configuration is
Since the configuration has the inner yoke 30c, the magnet 31 is opposed to the inner yoke 30c to form a magnetic gap, so that the magnetic flux is easily concentrated. A part of the focus coil 23 is inserted into the magnetic gap, 31
By causing a part of the tracking coil 24 to face, the movable portion including the objective lens 21 can be efficiently moved in two directions of a focus direction 34 perpendicular to the disk and a tracking direction 35 parallel to the disk. Can be driven.

FIG. 5 shows a detailed view of the conventional art. (A) of FIG.
2B, reference numeral 22a denotes a positioning hole provided in the lens holder 22 for positioning the metal wire spring 26;
Is a groove provided in the lens holder 22 for press-fitting and fixing both sides of the terminal plate 25; 25b is a coil end line processing unit for soldering both ends of the coil;
Represents solder attached to the terminal plate 25.

[0010] Assembling is performed by the groove 22 of the lens holder 22.
Then, the terminal plate 25 is press-fitted and fixed to c, and both ends of the coil are wound around the coil end line processing unit 25b and soldered. At this time, the solder 33 rises over the entire terminal board 25 depending on the amount and temperature of the solder. Thus, the metal wire spring 2 inserted into the positioning hole 22a of the metal wire spring 26 provided in the lens holder 22
6, the solder 33 cannot be sufficiently removed due to the rise of the solder 33, and if the metal wire spring 26 is forcibly passed, bending occurs. Therefore, the clearance between the terminal plate 25 and the metal wire spring 26 is d.
Are formed.

[0011]

In such a conventional objective lens driving device, both ends of the focus coil 23 and the tracking coil 24 are connected to the terminal plate 25.
When soldering is performed, the solder 33 is attached to the entire terminal plate 25 in a protruded state. At this time, a positioning hole 22a provided in the lens holder 22 for positioning the metal wire spring 26
When the metal wire spring 26 is inserted into the metal wire spring 26, the metal wire spring 26 hits the solder 33 after passing through the positioning hole 22a because the solder 33 on the terminal plate 25 is raised.
6 reduces the soldering cost, and also forces the metal wire spring 2
When the wire 6 passes through, the metal wire spring 26 is bent, so that the clearance d is provided between the terminal plate 25 and the metal wire spring 26 as described above. However, this clearance d causes poor soldering. Has problems.

Further, when the metal wire spring 26 and the terminal plate 25 are soldered, the solder 33 adheres to the entire terminal plate 25, so that the amount of the solder 33 increases and the two coils, the lens holder 22 and the terminal plate 25 are connected. The weight of movable parts including
There is a problem that sensitivity is deteriorated.

Further, the metal wire spring 26 cannot be supported at a stable position due to the amount of the solder 33, which causes a characteristic variation. Therefore, it is required to solve these problems.

An object of the present invention is to provide an objective lens driving device which can be joined to a stable position with a small amount of solder when fixing the metal wire spring 26, and which can secure a stable quality.

[0015]

In order to solve this problem, an objective lens driving device according to the present invention is provided with first and second projecting portions projecting in the same direction on a terminal plate attached to a lens holder. A terminal of a focus coil or a tracking coil is connected to the first protrusion, and a conductive spring material for swingably supporting the lens holder is fixed to the second protrusion.

According to the present invention, an objective lens driving device capable of stably connecting the conductive spring material to the terminal plate can be obtained.

[0017]

In the objective lens driving device according to the present invention, a focus coil is wound around a side of a lens holder for holding an objective lens, and tracking is performed on the lens holder about an axis parallel to a disk. A coil is wound, the lens holder is swingably supported via a plurality of conductive spring materials, and a magnet is provided on the fixed side so as to face the lens holder, and is attached to the lens holder. A moving coil system in which terminals of the focus coil and the tracking coil and one end of the conductive spring material on the swinging side are connected via a terminal plate, and the focus coil and the tracking coil are energized through the conductive spring material. In the objective lens driving device, the terminal plate is attached to a mounting surface to be mounted on the lens holder. A first and a second protrusion are connected to one end of the focusing coil and project in the same direction. A terminal of the focus coil or the tracking coil is connected to the first protrusion, and the conductive spring material is connected to the second protrusion. It is characterized by being fixed to the protruding part.

According to this structure, the clearance between the end of the conductive spring material and the terminal plate is increased in consideration of the bump of the solder generated by soldering the terminal of the coil to the first protrusion. In this case, the end of the conductive spring material can be reliably connected via the second protrusion of the terminal plate.

According to a second aspect of the present invention, there is provided an objective lens driving device.
2. The terminal according to claim 1, wherein the second protrusion of the terminal plate is connected to the mounting surface via a rising portion having one end connected to a mounting surface mounted to the lens holder, and the rising portion being parallel to the mounting surface. And a conductive spring material is connected to the connection surface.

According to this configuration, even if the clearance between the terminal plate and the end of the conductive spring material is reduced,
The bump of the solder generated by soldering the end of the coil to the first protrusion does not extend over the connection surface of the second protrusion, which is the connection point between the conductive spring material and the terminal plate.

The objective lens driving device according to claim 3 is
In the first aspect, the terminal plate and the conductive spring material are laser-welded, and the weight of the coupling member can be reduced, so that the sensitivity can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
It will be described based on. FIG. 1 shows an objective lens driving device according to the present invention. Reference numeral 1 denotes an objective lens, and reference numeral 2 denotes a rectangular parallelepiped lens holder that holds the objective lens 1. The lens holder 2 is provided with a focus coil 3 and a tracking coil 4 wound around an axis parallel to the disk and on both sides of the objective lens 1 at substantially the center of the side surface around an axis perpendicular to the disk. Have been.

Four metal wire springs 6 as conductive spring materials
Are fixed to the four terminal plates 5 fixed to the lens holder 2 and the holder substrate 7 on the fixed side by soldering or laser welding. As a result, the lens holder 2 is moved in two directions of the focus direction 4 and the tracking direction 5. Supported in a cantilevered manner.

Both ends of the focus coil 3 and both ends of the tracking coil 4 which is two continuous coil windings are connected to the terminal plate 5 by soldering.
A current can be supplied to each coil from the four metal wire springs 6. 2A and 2B show a state before the metal wire spring 6 is soldered to the terminal plate 5. FIG. The structure of the terminal plate 5 will be described later in detail with reference to FIG.

Reference numeral 9 denotes a holder, and four metal wire springs 6 are provided.
Hold them to determine their position. 8
Is a silicon-based gel, which is filled in a container provided in the holder 9 and then gelled by irradiation of ultraviolet rays. The movable part including the lens holder 2 is controlled by braking the movement of the metal wire spring 6. To dampen the primary resonance vibration.

Reference numeral 10 denotes a yoke base, which has a base 10a having a surface parallel to the disk, and a base 1a.
0a and a plate-shaped outer yoke 10b and an inner yoke 10 arranged perpendicular to the disk so as to protrude from the disk side.
and c are integrally formed. A magnet 11 magnetized one by one in the thickness direction is fixed to the outer yoke 10b with the N-pole opposed to each other, and the magnet 11 is further opposed to the inner yoke 10c to form a magnetic gap. Insert a part of the focus coil 3,
By causing a part of the tracking coil 4 to face the magnet 11, the movable portion including the objective lens 1 can be driven in two directions, a focus direction 14 perpendicular to the disk and a tracking direction 15 parallel to the disk. .

The holder 9 and the fixed-side holder substrate 7 are fixed to the outer yoke 10b by screws 12. The general operation of the moving coil type objective lens driving device is as follows.

First, since the structure has the inner yoke 10c, the magnet 11 is opposed to the inner yoke 10c to form a magnetic gap.
A part of the focus coil 3 is inserted into the magnetic gap, a part of the tracking coil 4 is opposed to the magnet 11, and a current is supplied to both coils. It can be driven in two directions: a focus direction 14 perpendicular to the disk and a tracking direction 15 parallel to the disk.

A groove 2c is formed in the lens holder 2 at a position where the terminal plate 5 is mounted. The terminal plate 5 is inserted into the groove 2c, and the four terminal plates 5 are press-fitted and fixed to the lens holder 2. .

The terminal plate 5 has a mounting surface 5a inserted into the groove 2c of the lens holder 2 and a mounting surface 5a as shown in the plan view, front view, and side view shown in FIGS.
a is provided with first and second protrusions 5b and 5c which are connected at one end and project in the same direction. Second protrusion 5c is constituted by cutting and raising a part of the mounting surface 5a to shaped L, the second projecting portion 5c and the rising portion 5c _1,
Parallel to the mounting surface 5a, is composed of a parallel connection surface 5c ₂ are more specifically bent 90 °.

In assembling, the ends of the focus coil 3 and the tracking coil 4 are soldered to the tip of the first protrusion 5b of the terminal plate 5, and the metal wire spring 6 is connected to the second protrusion 5c.
Are soldered to the connecting surface 5c _2.

With this configuration, both ends of the focus coil 3 and the tracking coil 4 are connected to the first terminal plate 5.
When the solder 13 is raised on the mounting surface 5a when soldering to the protrusion 5b, the protrusion of the solder 13 does not reach the upper surface of the connection surface 5c2 of the _second protrusion 5c, and the metal wire The solder allowance and bending of the spring 6 can be eliminated.

Since there is no need to consider the bulge of the solder 13, the metal wire spring 6 and the portion 5a of the terminal plate 5 to which the solder is fixed are used.
By minimizing the clearance with the soldering, stable soldering can be achieved,
It will improve the stability of quality.

In the above embodiment, the metal wire spring 6 is used.
Although the terminal plate 5 and the terminal plate 5 are soldered, when the terminal plate 5 and the metal wire spring 6 are laser-welded, the weight of the coupling member can be reduced, thereby improving the sensitivity.

[0035]

As described above, according to the present invention, the terminal plate is provided with a mounting surface to be mounted on the lens holder and first and second protrusions having one end connected to the mounting surface and protruding in the same direction. The terminal of the coil or the tracking coil is connected to the first protrusion, and the conductive spring material for swingably supporting the lens holder is fixed to the second protrusion, so that the terminal of the coil is soldered to the first protrusion. Even when the clearance between the end portion of the conductive spring material and the terminal plate is increased in consideration of the bump of the solder generated by the attachment, the end portion of the conductive spring material is kept at the second end of the terminal plate. Can be reliably connected via the protrusions of

Also, the second projecting portion of the terminal plate is connected to a mounting portion having one end connected to a mounting surface to be mounted on the lens holder, and to the mounting surface via the rising portion in parallel with the mounting surface. When a conductive spring material is connected to the connection surface, the soldering of the conductive spring material and the terminal plate can be performed without considering the bump of the solder at the time of coil end line processing. And the conductive spring material can be configured to be sufficiently close to the terminal plate, so that stable solder fixing can be achieved.

Further, by reducing the size of the solder fixing portion, the weight of the solder can be reduced, and the sensitivity can be improved. Further, by connecting the terminal plate and the conductive spring material by laser welding, the number of movable parts can be further reduced, and the sensitivity can be improved.

As a result, there is obtained an advantageous effect that the productivity, quality stability and performance of the objective lens driving device can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an objective lens driving device according to an embodiment;

FIG. 2 is a plan view and a side view of a main part of the embodiment.

FIG. 3 is a plan view, a front view, and a side view of the terminal board of the embodiment.

FIG. 4 is a configuration diagram of a conventional objective lens driving device.

FIG. 5 is a plan view and a side view of a main part of a conventional objective lens driving device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Objective lens 2 Lens holder 2a Positioning hole 2c Groove 3 Focus coil 4 Tracking coil 5 Terminal plate 5a Mounting surface 5b First protruding portion 5c Second protruding portion 5c ₁ Rising portion of _second protruding portion 5c ₂ Second Connection surface parallel to mounting surface 5a of protrusion 6 Metal wire spring (conductive spring material) 7 Holder substrate 11 Magnet 12 Screw 13 Solder

Claims (3)

[Claims] 1. A focus coil is wound around a side surface of a lens holder for holding an objective lens, a tracking coil is wound around the lens holder around an axis parallel to a disk, and a plurality of conductive coils are connected to the lens holder. It is supported swingably via an elastic spring material, a magnet is provided on the fixed side facing the lens holder, and the terminal of the focus coil and the tracking coil via a terminal plate attached to the lens holder. A moving coil type objective lens driving device that connects one end of the conductive spring material on the swinging side and energizes the focus coil and the tracking coil via the conductive spring material; A mounting surface to be mounted on the holder and a first protruding in the same direction with one end connected to the mounting surface; A second protrusion provided to connect the terminals of the focus coil or the tracking coil in the first projecting portion, the objective lens driving device is fixed to the conductive spring member to the second projecting portion. 2. A second protrusion of the terminal plate is connected to a mounting portion having one end connected to a mounting surface to be mounted on the lens holder, and to the mounting surface via the rising portion in parallel with the mounting surface. 2. The objective lens driving device according to claim 1, wherein the objective lens driving device comprises a connection surface, and a conductive spring material connected to the connection surface. 3. The objective lens driving device according to claim 1, wherein the terminal plate and the conductive spring material are laser-welded.