JP3338262B2 - Optical pickup - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a CD player, C
The present invention relates to an optical pickup used for a D-ROM device, an MD device, and the like, and particularly to an optical pickup in which a movable base on which an objective lens is mounted is movably supported by an elastic material or the like.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing the structure of an optical pickup for a CD player as a comparative example with the present invention.
In this optical pickup, a support base 1 is fixed on a moving base that moves along an optical disk. A U-shaped yoke 2 is fixed to the movable base, and supports the magnets 3a and 3b. A coil C1 for focus correction is buried in the inner peripheral portion of the through hole 4a of the movable base 4, and a pair of coils C2 and C3 for tracking correction are adhesively fixed to the side surface of the focus coil C1. The coils C1, C2 and C3 are connected to the magnets 3a and 3b.
The magnetic drive unit A is located between the two. A current flowing in the focus coil C1 in the Y direction and a magnetic field between the magnets 3a and 3b generate an electromagnetic force in the Z direction, whereby focus correction of the objective lens 5 held on the movable base 4 is performed. . Also, the tracking coils C2 and C3
, An electromagnetic force in the Y direction is generated by the current flowing in the Z direction, whereby the tracking correction of the objective lens 5 is performed.

On both sides of the support base 1 fixed on the moving base, there are formed recesses 1a, 1a penetrating in the X direction and having an elongated hole-shaped opening area in the Z direction. 6 are provided. The elastic member W supporting the movable base 4 is four elastic wires, and two elastic members W are inserted into the recess 1a as a set, and a base end thereof is a conductor pattern portion of the substrate 6. Is fixed with solder 7. On the side surface of the movable base 4, a set of two convex portions 8
Is formed. Insertion holes 8a are respectively formed in the protrusions 8, and the distal ends of the elastic members W are inserted and fixed. The movable base 4 holding the objective lens 5 is elastically supported by the elastic member W so as to be movable in the Y and Z directions.

In the example shown in FIG. 5, the elastic material W is also used as a current path to the coil, and wires L1 and L2, which are both ends of the coil C1, are individually connected to the elastic material W. The coils C2 and C3 for tracking correction are continuously wound by a common wire, and a wire extending between the coils C2 and C3 is indicated by L5. Wires L3 and L4 that are terminals from coils C2 and C3
Are also individually conducted to the elastic member W. That is,
The wires L1, L2, L3, L4 are individually conducted to the four elastic members W respectively, and are conducted to the conductor patterns on the circuit board 6 by the solder 7 via the elastic members W. The circuit pattern of the circuit board 6 is further connected to an external circuit.

[0005]

The above-mentioned coils C1, C
Wires L1, L2, L3, L4 which are winding terminals of C2, C3
Are conducted to the tip of each elastic member W. However, it is not preferable to directly solder and connect the wires L1, L2, L3, and L4 to the respective elastic members W as a wiring process. Therefore, for example, a relay board is provided on the movable base 4, and the wires L1 to L4 Are soldered to the conductor pattern of the relay board, and the elastic material W is also electrically connected to the conductor pattern of the relay board.

However, when the terminals of the wires L1, L2, L3 and L4 are soldered to the relay board, the ends of the wires are fixed according to the position, shape and direction of the conductor pattern (land portion) of the relay board. It is necessary to route from the direction. Therefore, a curved portion is easily formed in the wires L1 to L4. This flexure is the movable base 4
When formed so as to rise from the elastic member W, the bent portion easily hits the elastic member W or easily hits another component. Further, in the manufacturing process and the adjusting process, the bent portion is easily caught by other portions. The wire may be broken due to the hooking, or the soldered portion may be peeled off.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide an optical pickup which facilitates processing of a terminal of a coil and in which a bent portion is hardly formed in a wire.

[0008]

According to the present invention, there is provided a movable base having an objective lens and a coil mounted thereon, the movable base being supported in a movable state, and an external signal being supplied to the coil.
A support member for feeding the optical pickup in which a magnetic drive for applying a magnetic field provided in said coil, for contacting <br/> connection between the support member and the terminal of the coil on a side surface of the movable base A relay portion is provided, and a hook portion for hooking a wire extending from the coil between a side surface of the movable base and a wire extending from the coil is provided on a path from the coil to the relay portion and on the movable base. It is a feature.

The engaging portion is formed, for example, integrally with the movable base . Alternatively, a relay board that forms the relay section is attached to a side surface of the movable base , and an end of the relay board is the hook section . In addition, the hook portion
Being formed on both sides of the relay section
Is preferred.

[0010] In the optical pickup of the present invention, the wire drawn from the coil provided on the movable base is hooked by the hook portion and drawn, thereby facilitating the wire drawing operation. By this routing, the end of the wire is opposed to the conductor pattern (land) on the relay board from a predetermined direction, so that the terminal of the wire can be securely soldered to the relay board. In addition, a certain amount of tension is given to the wire by holding the wire in a groove for the terminal of the wire to enter, or in a gap between the relay board and the movable base, and then laying the wire around the groove or the gap. In this state, the wire is drawn closely in contact with the movable base, and the wire is less likely to be loosened.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1A is a plan view of the optical pickup of the present invention, and FIG. 1B is a side view thereof. The basic structure of this optical pickup is the same as that shown in FIG. The moving base 9 is movably supported by a guide shaft (not shown), and moves in the radial direction along the optical disk. The support base 1 and the magnets 3a and 3
The yoke 2 supporting b is fixed. The objective lens 5 is mounted on the movable base 4 and
Focus coil C1 and tracking coils C2, C3
Is held. Tracking coils C2 and C3 are
The coils connected in series, and the focus coil C1
Is fixed to the side surface with an adhesive or the like. Then, a part of the focus coil C1 and each of the tracking coils C2, C
Part 3 is located between the magnets 3a and 3b.

The movable base 4 is attached to the support base 1 by four elastic members W, that is, wire dampers, in the Y direction and the Z direction.
It is elastically levitated and supported so that it can move in each direction. That is, in the example of FIG. 1, the four elastic members W are supporting members that support the movable base 4 in a movable state. The movable base 4 in a floating state is driven for focus correction in the Z direction and driven for tracking correction in the Y direction by the electromagnetic force of the current flowing through each coil and the magnetic field between the magnets.

FIG. 2A shows a coil C2 of the movable base 4.
2 (B) is a plan view of FIG. 2 (A) as viewed from above (a bottom view as viewed from below in FIG. 1 (A)). Figure). On the left and right side walls of the movable base 4, convex portions 8,
8 are respectively formed so as to protrude. Each of the projections 8 is formed with an insertion hole 8a penetrating in the X direction in the drawing, into which the distal end of the elastic member W is inserted. The insertion hole 8a has a wide entrance (X (-)) side and a large exit (X (+)).
The elastic material W is formed so as to become narrower toward the side, so that the elastic material W can be easily inserted into the insertion hole 8a. Relay boards 11 are adhesively fixed at positions near the protrusions 8 on both side surfaces of the movable base 4.
Are conductively fixed to the conductor pattern on the relay board 11 with the solders 14a1 and 14a2, respectively, while being inserted into the insertion holes 8a. As shown in FIG. 1, the elastic member W is inserted into the concave portion 1 a of the support base 1, which is elongated in the Z direction and penetrates in the X direction. Support base 1
The substrate 6 is fixed to the end on the X (-) side of each of the elastic members W
Is inserted into the through hole of the substrate 6 and is fixed to the conductor pattern with solder 7.

A gel damper agent is injected into the concave portion 1a, and the damper agent can exert a vibration damping effect on the vibration of the elastic material W. In the example shown in FIG. 1 and FIG. 2, the hooks 12a, 12b are formed on the X (-) side and the hooks 13a, 13b are formed on the X (+) side with the protrusions 8, 8 interposed therebetween. FIG.
In (A) and (B), the hook 1 provided on the coil C2 side
2a and 13a appear. These hooks 12a, 1
2b and the hooks 13a, 13b are formed of synthetic resin together with the projection 8 integrally with the movable base 4. As shown in FIG. 2 (B), the hook 12a is
Is formed on the side surface 4b that is inclined with respect to the X direction, and the hook 13a is formed on the side surface 4c that is also inclined.
Is formed in the part. Also, each of the hooks 12a and 13a
Has a slanted surface, and as a result, the hook 12a
And 13a, and V-shaped grooves 12a1 and 13a1 are formed between the tips of the side surfaces 4b and 4c.

Wires L1, L2, L3, and L4, which are terminals of the windings of the coils C1, C2, and C3, are drawn out of the movable base 4 and are respectively located on the bottom side (Z (-)) of the movable base 4.
Side) and pulled out to a position on the relay board 11 and soldered to the conductor pattern of the relay board 11. At this time, as shown in FIGS. 2A and 2B, a wire L2 extending from the coil C1 is formed at a corner 4d between the side surface 4b and the bottom surface of the movable base 4.
Is bent at a right angle, and the side surface 4b has a hook 12a.
Hanged on. At the hooking portion 12a, the wire L2 is hooked on the groove 12a1, and thereafter the wire L2 is bent at a substantially right angle from the Z (+) direction to the X (+) direction. The tip of the wire L2 is fixed to the conductor pattern on the relay board 11 by solder 14b1. In the relay board 11, the solder 14
The connection between a1 and the solder 14b1 is conducted by the conductor pattern, and as a result, the wire L2 is conducted to the elastic material W located on the Z (+) side.

Similarly, a wire L4 extending from the coil C2
Is bent at a substantially right angle by a corner 4e between the side surface 4c and the bottom surface of the movable base 4, and furthermore, the groove 13a of the hook portion 13a is formed.
Multiplied by one. The wire rod L4 is bent at a right angle in the X (-) direction at the Z (+) side end of the hook portion 13a, and
1 is led to the conductor pattern. The tip of the wire L4 is fixed to this conductor pattern by solder 14b2, and the conductor pattern of the relay board 11 allows the wire L4 and the elastic material W on the Z (-) side to conduct.

In the example shown in FIG. 2, since the wire L2 and the wire L4 are hooked on the grooves 12a1 and 13a1 of the hook portions 12a and 13a, the wires L2 and L4 are hardly lifted from the side surfaces 4b and 4c. Further, the wire is bent at a right angle but not at an acute angle, so that the wire is hardly cut by bending. The wires L2 and L4 are X
Since the wires extend in the directions and are linearly guided from the sides with respect to the relay board 11, respectively, it is easy to hold the terminal of the wire when soldering to the relay board 11, and the soldering work is easy. is there. The wires L2 and L4 are movable base 4
Since the contact portion extends in close contact with the surface of the movable base 4, no slack portion is formed, and the slack portion does not rise from the movable base 4.

The processing of the wires L1 and L3 on the side of the Y (-) side in FIG. 1 is the same as that in FIG. Instead of forming the grooves 12a1 and 13a1 at the tips of the hooks 12a and 13a, the wire may be simply wound around the edge of the hook.
Further, in order to prevent the wire rod from being bent at a right angle, the hook may be formed as a circular projection, and the wire rod may be hung on a curved edge.

FIG. 3 shows another example of the structure of the present invention. FIG. 3A is a partial perspective view showing the movable base 4 with its bottom face up as in FIG. (B) is FIG.
It is a top view (bottom view of a movable base) of (A). In this example, the hooks 12a, 12b as shown in FIGS.
The hooks 13a and 13b are not formed on the movable base 4, and the relay board 21 functions as a hook.

A relay board 21 is bonded and fixed to side walls 4f formed on both sides of the movable base 4 in parallel with the X direction. The relay board 21 shown in this example has a substantially cross shape. A portion of the relay board 21 is extended in the X direction, and an extended portion in the X (-) direction is a hook 21a, X (+).
The extending portion in the direction is a hook 21b. The side surfaces 4b and 4c of the movable base 4 at the portions where the hook portions 21a and 21b extend are not parallel to the X direction but inclined in the Y (-) direction. Therefore, as shown in FIG.
A gap is provided between both back surfaces of the hook portions 21a and 21b, which are extensions of the relay board 21, and the side surfaces 4b and 4c.
Is formed.

The elastic member W, which is a support member for supporting the movable base 4 in a floating manner, is inserted into the protruding portions 8 formed on the side surface of the movable base 4. The elastic members W, W are conductively fixed to the conductor pattern of the relay board 21 by the solders 22b and 23b. Coil C
1 is bent at a corner 4d of the movable base 4 at a right angle, extends in the Z (+) direction along the side surface 4b, and is further pushed into the gap between the hooking portion 21a and the side surface 4b to hang. Is stopped. The wire L2 is connected to the hook 21a.
Is bent into a U-shape by the edge on the Z (+) side, and is guided to the front surface side of the relay board 21, and is conductively fixed to the conductor pattern on the relay board 21 by the solder 22a. Solder 22
The wires a and 22b are attached to both ends of the conductor pattern P1 on the relay board 21, so that the wire L2 and the elastic material W located on the Z (-) side are mutually conductive by the conductor pattern P1.

Similarly, a wire L4 extending from the coil C2
Is bent at a right angle at the corner 4e, and furthermore, the hook 21b
And is hooked by being pushed into the gap between the wire and the side surface 4c, is folded back to the front side at the Z (+) side edge of the hooking portion 21b, and is conductively fixed to the conductor pattern by the solder 23a. The solder 23a and the solder 23b are formed at both ends of the conductor pattern P2.
The (+) side elastic material W is conducted.

In the example shown in FIG. 3, the wires L2 and L4
Are wired with a predetermined tension without leaving the surface of the movable base 4. In addition, since the relay board 21 is used as a hooking member, there is no need to project the hooking portion on the movable base as shown in FIGS. 1 and 2, and the shape of the movable base 4 can be simplified. In addition, one hooking portion 2 of the relay board 21
1b is fitted between the protrusions 8 of the movable base 4, so that the relay board 21 can be positioned.
And a conductor pattern for soldering the elastic member W can be accurately aligned.

FIG. 4 shows a modification of the configuration shown in FIG. In FIG. 4, a rectangular groove-shaped recess 12a2 is formed at the tip of the hook 12a, and the wire L2 is hooked in the recess 12a2 and soldered to the relay board 11. A groove 8b is formed at the boundary between the side of the protrusion 8 supporting the tip of the elastic member W and the side surface 4c, and the wire L4 is hooked on the groove 8b and guided to the relay board 11. . In addition, the example shown in FIG. 2, the example shown in FIG. 3, and the example shown in FIG. 4 may be used together in one movable base. Further, in the example of the drawing, the elastic material W is used as a current path to the coil. However, an external circuit may be connected to the relay board 11 or the relay board 21 via a path other than the elastic material W.

[0025]

According to the present invention described in detail above, the routing path of the wire end is clear, and the wire can be routed in a state where the wire is pulled to some extent, so that the work is easy and the connection is completed in a short time. can do. Also,
The soldering operation can be performed by applying a tension such that no slack is formed in the wire. Therefore, disconnection of the wire due to slack can be prevented, and the wiring and soldering work is easier than the work of forming in the space without hanging the wire in the middle.

[Brief description of the drawings]

FIG. 1 shows an optical pickup of the present invention, wherein (A) is a plan view and (B) is a side view thereof.

2A is a perspective view showing a part of the movable base shown in FIG. 1 with its bottom face up, FIG. 2B is a plan view thereof,

FIG. 3 shows an optical pickup having another structure of the present invention;
(A) is a perspective view showing a part of the movable base with its bottom face up, (B) is a plan view thereof,

FIG. 4 is a perspective view showing still another configuration example, showing a part of a movable base with its bottom face up;

FIG. 5 is a plan view showing the structure of an optical pickup for a CD player as a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support base 4 Movable base 5 Objective lens 8 Convex part 11 Relay board 12a, 12b, 13a, 13b Hook part 12a1, 13a1 Groove 21 Relay board 21a, 21b Hook part A Magnetic drive part C1, C2, C3 Coil W Elastic material L1, L2, L3, L4 Wire, gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B ^7/ 09-7/10

Claims (4)

(57) [Claims] A movable base 1. A mounted with the objective lens and the coil, when supporting the movable base movably together
An optical pickup provided with a support member for supplying an external signal to the coil and a magnetic drive unit for applying a magnetic field to the coil, wherein a terminal of the coil and the support are provided on a side surface of the movable base.
A hook for connecting a wire extending from the coil to a side surface of the movable base on a path from the coil to the relay and on the movable base; An optical pickup, comprising: 2. The optical pickup according to claim 1, wherein the engaging portion is formed integrally with the movable base. 3. A relay board forming the relay section is attached to a side surface of a movable base , and an end of the relay board is provided.
2. The optical pickup according to claim 1, wherein the optical pickup is the hook. 4. The hook portion is provided on both sides of the relay portion.
4. The method according to claim 1, wherein each of the first and second parts is formed.
Optical pickup as described.