JP3481106B2 - Pickup device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup device for optically recording a signal on an optical disk or optically reproducing a signal recorded on an optical disk, and more particularly to adjusting the position of an objective lens. At the same time, the present invention relates to a pickup device that collects light rays by an objective lens and irradiates the signal surface of an optical disc.

[0002]

2. Description of the Related Art Compact disc (CD) players, mini disc (MD) players, digital video discs
An optical disk device such as a (DVD) player is provided with a pickup device for recording a signal on the optical disk or reproducing a signal recorded on the optical disk.

For example, in the optical disk device shown in FIG. 10, a spindle motor (11) for rotating the optical disk (10) at a high speed is mounted on the chassis (1) and is parallel to the radial direction of the optical disk (10). A pair of guide shafts (12) and (13) extending in the direction of the optical disk are installed, and the pickup device (2) is supported by the guide shafts (12) and (13) so as to be capable of reciprocating in the radial direction of the optical disc (10). Pickup device
(2) includes an optical system component (3) such as a laser source, and an objective lens (84) on a movable table (21) whose both sides are slidably engaged with the guide shafts (12) and (13). ) Is mounted on the objective lens driving device (8).

11 to 13 show a concrete structure of the objective lens driving device (8). In the objective lens driving device (8), a supporting portion fixed on the movable table.
A driven part (82) having an objective lens (84) is elastically supported by (81) by four wire springs (90), (90), (90) and (90) extending in parallel with each other. Wire spring (90) (90) (90) (90)
Is formed of a conductive material, such as beryllium copper.

The supporting portion (81) of the objective lens driving device (8) is
The yoke (80) is fixed to the movable table by screwing, and the yoke (80) is provided on the substantially square yoke base (800) with the first to third vertical yoke pieces (801) facing each other.
(802) and (803) are provided so as to project. A support member (810) is fixed to the back surface of the first vertical yoke piece (801), and a support portion side relay substrate (812) is bonded and fixed to the back surface of the support member (810). A wiring pattern (not shown) for connection to an external circuit is formed on the support portion side relay substrate (812). Flat plate magnets (88) (89) facing each other are fixed to the front surface of the second vertical yoke piece (802) and the back surface of the third vertical yoke piece (803), respectively.

Driven part (82) of objective lens driving device (8)
Includes a U-shaped frame body (83a), and a semicircular lens holding frame (83b) projects at a position higher than the upper surface of the frame body (83a) at the opening end of the frame body (83a). The objective lens (84) is horizontally fixed and adhered to the lens holding frame (83b). The frame
(83a) and the lens holding frame (83b) are integrally molded.
Further, the driven portion (82) of the objective lens driving device (8) is a frame (8
The opening of 3a) is provided with one focus coil (85) having a vertical winding axis and a pair of tracking coils (86) (86) having a horizontal winding axis. These coils (85) (8
6) (86) is an air-core coil, and a pair of tracking coils (86) (86) are preliminarily adhered and fixed to the outer peripheral surface of the focus coil (85), and then the focus coil (85) is framed ( 83a) is bonded and fixed to the inner surface of the opening.

On the both side surfaces of the frame body (83a), the driven part side relay boards (9) and (9) are adhered and fixed. Both relay boards (9)
Two strip-shaped wiring patterns (91) and (91) are respectively formed in (9), and the focus coil (85) and the tracking coil (86) are provided at one end of both wiring patterns (91) and (91). ) (86) are connected at their ends by the solder layer (94). A balance weight plate (87) is fixed to the bottom of the frame body (83a) to prevent rolling of the driven portion (82) during signal recording / reproduction.

The driven part (8) of the objective lens driving device (8)
In 2), the second vertical yoke piece (802) and the magnet (88) are housed in the central cavity of the focus coil (85),
It is arranged on the yoke base (800) so that the third vertical yoke piece (803) and the magnet (89) are housed between the objective lens (84) and the tracking coils (86) (86). Magnet (8
8) (89), the focus coil (85), the second and third vertical yoke pieces (802) (803) form a magnetic circuit through which the magnetic flux from the magnets (88) (89) flows, and the magnet ( 8
A magnetic circuit through which the magnetic flux from the magnets (88) and (89) flows is formed by 8) (89), the tracking coils (86) (86), and the second and third vertical yoke pieces (802) (803). Further, a shield plate (804) is arranged over the upper ends of the second vertical yoke piece (802) and the third vertical yoke piece (803) to prevent generation of leakage magnetic flux. 11 and 12, the shield plate (804) shown in FIG. 13 is omitted for convenience.

Then, the respective base end portions of the four wire springs (90), (90), (90) and (90) are connected to the wiring pattern of the supporting portion side relay substrate (812) by the solder layer (93). At the same time, the wiring patterns (91), (91), (91), (91) of the driven part side relay board (9) (9)
The tip end of each wire spring (90) is connected to the other end of each of them by a solder layer (92). In this way, the supporting part (81) and the driven part (82) of the objective lens driving device (8) are mechanically and electrically driven by the four wire springs (90) (90) (90) (90). Are connected to each other.

During signal reproduction of the above optical disk device, the optical disk (10) shown in FIG.
Rotate at high speed by 1) and pick up device (2)
Are reciprocated in the radial direction of the optical disk (10) by a reciprocating drive mechanism (not shown). Further, in FIG. 11, a relay board (8) for supporting the objective lens driving device (8) is provided from an external circuit.
12), the wire spring (90) and the driven part side relay substrate (9), and then the focus coil (85) and the tracking coil (86) (8)
6) is energized, and thereby the electromagnetic force in the focus direction X generated in the focus coil (85) and the electromagnetic force in the tracking direction Y generated in the tracking coils (86) and (86) are used to drive the objective lens driving device. The driven part (82) of (8) is driven in the focus direction X and the tracking direction Y. The pickup device is thus the objective lens driving device (8)
While finely adjusting the position of the objective lens (84) in the focusing direction X and the tracking direction Y, the laser beam
The laser beam reflected by the signal surface and returned by the objective lens (84) is condensed again by the objective lens (84) and is then detected. Then, the data recorded on the optical disc (10) is read based on the detected laser light.

[0011]

However, in the conventional objective lens driving device (8), as shown in FIGS.
Since the driven part side relay boards (9) and (9) are required as shown in (3), there is a problem that the number of parts is large. Also, wire spring (90)
Is fixed on the wiring pattern (91) of the driven part side relay substrate (9) by the solder layer (92), there is a problem that reliability of fixing strength is low. Also, in the conventional assembly process of the objective lens driving device (8), when the tip end of the wire spring (90) is fixed at a predetermined position on the wiring pattern (91) of the driven part side relay substrate (9), the wire spring Not only is it difficult to position the tip of (90),
The tip of the (90) may be displaced from a predetermined position on the wiring pattern (91), resulting in low assembly accuracy. Therefore, an object of the present invention is that the number of parts is smaller than the conventional one, not only the reliability of the fixing strength of the wire spring is high, but also the positioning of the wire spring is easy in the assembling process and the assembling accuracy is high. It is to provide a device.

[0012]

A pickup device according to the present invention is adapted to reciprocally drive in a radial direction of a rotating optical disc to record a signal on the optical disc or reproduce a signal from the optical disc. A support member, to which a terminal plate for connecting to an external circuit is attached, is fixed on a moving base that is reciprocally driven in the radial direction, and
The lens holder is elastically supported on the support member via a plurality of conductive wire springs. An objective lens for irradiating the optical disc with a light beam and a coil to which electric power is to be supplied from an external circuit are mounted on the lens holder, and magnet means is installed on the movable table so as to face the coil. The lens holder is driven by energizing the coil from the external circuit through the terminal plate and the wire spring. As the terminal board, for example, a printed wiring board on which a wiring pattern is formed or a flexible printed circuit board (FPC) is adopted. Further, as the magnet means, a permanent magnet, an electromagnet, or other equivalent material is adopted.
Each of the wire springs has a first enlarged portion at least at an end on the lens holder side, and the lens holder has a plurality of engagement grooves in which at least a part of the first enlarged portion of each wire spring is to be engaged. It is set up. The first of the wire springs here
The enlarged portion has a sufficient area to connect the ends of the coil. Each of the first enlarged portions is adhesively fixed on the lens holder in a state of being engaged with each of the engagement grooves of the lens holder, and the end portion of the coil is connected to each of the first enlarged portions by soldering.

In the pickup device according to the present invention, since the first enlarged portion of the wire spring has a sufficient area to connect the end portion of the coil, the first end portion of the coil is directly connected to the first enlarged portion. Can be connected to the expansion section. Therefore, the driven part side relay boards (9) and (9) used in the conventional pickup device are unnecessary, and the number of parts is reduced. Also, the first enlarged portion of the wire spring is
Since the adhesive is fixed on the lens holder, the reliability of the fixing strength is improved as compared with the conventional pickup device fixed on the lens holder by soldering.

In the process of assembling the pickup device, when the wire spring is fixed on the lens holder, the wire spring can be accurately positioned by engaging the first enlarged portion of the wire spring with the engaging groove of the lens holder. , Easy to position. In addition, since the first enlarged portion of the wire spring is bonded and fixed onto the lens holder while being engaged with the engaging groove of the lens holder, the wire spring can be securely fixed at a predetermined position on the lens holder without being displaced. As a result, the assembly accuracy is improved.

Specifically, each wire spring has a second enlarged portion at the end portion on the side of the supporting member, while at least a part of the second enlarged portion of each wire spring is to be engaged with the supporting member. The engaging groove is recessed. Each of the second expanding portions,
The terminal plate and each of the second enlarged portions are bonded and fixed to the supporting member in a state of being engaged with each of the engaging grooves of the supporting member, and are connected to each other by soldering.

In the pickup device having the specific structure, since the second enlarged portion of the wire spring is adhesively fixed on the supporting member, the second expanding portion of the wire spring is fixed to the supporting member by soldering as compared with the conventional pickup device. Improves reliability of fixed strength.

In the assembling process of the pickup device having the above-mentioned specific structure, after fixing the second expanded portion of the wire spring on the support member, the wiring pattern of the support member and the second expanded portion of the wire spring are mutually connected by soldering. Connecting.

In the assembling process, when the wire spring is fixed on the support member, the wire spring is accurately positioned by engaging the second enlarged portion of the wire spring with the engaging groove of the support member. It's easy. Further, since the second enlarged portion of the wire spring is adhesively fixed on the support member in a state of being engaged with the engagement groove of the support member, the wire spring can be securely fixed at a predetermined position on the support member without being displaced. I can. In addition, since the second enlarged portion of the wire spring is fixed on the support member during soldering, the wire spring does not shift from the support member, and workability is good.

Further, specifically, the first enlarged portion of each wire spring is bent in a direction in which the flat plate portion to be engaged with the engagement groove of the lens holder and the end portion of the flat plate portion are separated from the lens holder. A bent portion, and each flat plate portion is adhesively fixed on the lens holder in a state of being engaged with each engaging groove of the lens holder, and the end portion of the coil is connected to each bent portion by soldering. .

In the pickup device having the specific structure, since the bent portion of the first enlarged portion of the wire spring protrudes from the engaging groove of the lens holder and is not in direct contact with the lens holder, the end portion of the coil is When connecting to the bent portion by soldering, heat during soldering is difficult to transfer to the lens holder. Therefore, it is possible to prevent the lens holder from being deformed by heat during soldering. Further, in the assembling process of the above pickup device, when engaging the first enlarged portion of the wire spring with the engagement groove of the lens holder, an assembly worker must perform work by sandwiching the bent portion of the first enlarged portion. The workability is improved.

More specifically, the first enlarged portion of each wire spring is connected to the fixed enlarged portion to be engaged with the engagement groove of the lens holder and the end portion of the coil connected to the fixed enlarged portion. And an enlarged portion for coil connection to be made. Each fixing enlarged portion is adhered and fixed on the lens holder in a state of being engaged with each engaging groove of the lens holder, and each coil connecting enlarged portion is mounted on the lens holder. The ends of the coil are connected to each other by soldering.

In the assembling process of the pickup device having the specific structure, first, the fixing enlargement portion of the first enlargement portion of the wire spring is bonded and fixed on the lens holder in a state of being engaged with the engaging groove of the lens holder. To do. Then, after the end portion of the coil is connected to the coil connection expansion portion of the first expansion portion of the wire spring by soldering, the coil connection expansion portion is fixed on the lens holder. In the assembling step, since the end portion of the coil can be soldered to the coil connecting enlarged portion while the coil connecting portion of the first enlarged portion of the wire spring is separated from the lens holder, heat generated during soldering can be reduced. Is hardly transmitted to the lens holder. Therefore, it is possible to reliably prevent the lens holder from being deformed by heat during soldering.

More specifically, the coil connecting expansion portion of the first expansion portion of each wire spring is fixed on the lens holder at a position lower than the center position of the driving force generated in the coil.

In the conventional pickup device shown in FIGS. 12 and 13, it is necessary to dispose the objective lens (84) and the optical disc (10) at a position close to each other at the time of signal recording and reproduction of the optical disc (10). , Objective Lens (84)
Prism (31) for changing the direction of light rays in the position below
Therefore, the lens holding frame (83b) including the objective lens (84) is fixed on the frame body (83a) at a position higher than the upper surface of the frame body (83a). Therefore, if the balance weight plate (87) is omitted in the conventional pickup device, the objective lens (84), focus coil (85), tracking coil (86), frame (83a) and lens holding frame (83b)
The center of gravity of the driven part (82) constituted by is located higher than the center position P of the driving force generated in both coils (85) (86) (86). During recording and reproduction, rolling will occur in the driven portion (82) of the objective lens driving device (8).

In the pickup device having the above-mentioned specific structure, the coil connection enlarging portion in which the ends of the coil are connected by the solder layer is placed on the lens holder at a position lower than the central position of the driving force generated in the coil. It is fixed to. As a result, the position of the center of gravity of the driven part composed of the objective lens, the coil, and the lens holder becomes lower than that in the conventional pickup device in which the balance weight plate (87) is omitted, and the driving force generated in the coil is reduced. Substantially coincides with the center position of, and as a result, the occurrence of rolling of the driven portion during signal recording / reproduction is suppressed. As described above, in the pickup device having the above-described specific configuration, the coil connecting expansion portion and the solder layer serve as balance weights. Therefore, the balance weight plate (87) used in the conventional pickup device can be omitted, and the number of parts can be further reduced.

[0026]

According to the pickup device of the present invention, the driven part side relay substrate can be omitted.
The number of parts is smaller than before. Also, the first wire spring
Since the magnified portion is adhesively fixed on the lens holder, reliability of fixing strength is improved. Further, in the assembly process of the pickup device, the wire spring is accurately positioned by engaging the first enlarged portion of the wire spring with the engaging groove of the lens holder, and therefore the positioning is easy. Further, since the wire spring can be securely fixed to the predetermined position on the lens holder without being displaced, the assembling accuracy is improved.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below based on two examples. First Embodiment FIGS. 1 to 4 show the overall configuration of an objective lens driving device (4) mounted on a pickup device of this embodiment. The objective lens driving device (4) of the present embodiment is mounted on the moving base (21) of the pickup device (2) as in the conventional objective lens driving device (8) shown in FIG. As shown in FIG. 3, a driven part (42) having an objective lens (44) extends in parallel to each other on a support part (41) fixed on a movable table.
It is elastically supported by the wire springs (5) (5) (5) (5) of the book. Wire spring (5) (5) (5) (5) is a conductive material,
For example, it is formed from beryllium copper.

The supporting portion (41) of the objective lens driving device (4) is
The yoke (40) is fixed to the movable table by screwing, and the yoke (40) is provided on the outer periphery of a substantially square yoke base (400) with a first vertical yoke piece (401) and a first vertical yoke piece (401) facing each other. The three vertical yoke pieces (403) are provided so as to project, and the first vertical yoke piece (401) and the third vertical yoke piece on the yoke base (400) are provided.
A second vertical yoke piece (402) opposed to both vertical yoke pieces (401) (403) is provided between the (403) in a protruding manner.

A support member (410) is fixed to the back surface of the first vertical yoke piece (401), and both side surfaces of the support member (410) extend horizontally from the front surface to the back surface as shown in FIG. Engagement groove
(411) are vertically recessed in two places on the right side surface and the left side surface. Further, on the back surface of the supporting member (410), the supporting portion side relay substrate (412) is bonded and fixed as shown in FIGS. 1 to 4,
A wiring pattern (not shown) for connecting to an external circuit is formed on the supporting portion side relay substrate (412). On the front surface of the second vertical yoke piece (402) and on the back surface of the third vertical yoke piece (403), flat magnets (48) (49) facing each other are provided.
Is fixed.

Driven part (42) of the objective lens driving device (4)
Is a U-shaped frame body having a width narrower than that of the support member (410).
(43a), a semicircular lens holding frame (43b) is projected at a position higher than the upper surface of the frame (43a) at the opening end of the frame (43a), and the lens holding frame (43b ), The objective lens (44) is adhesively fixed in a horizontal posture. The frame body (43a) and the lens holding frame (43b) are integrally molded to form a lens holder. The driven part (42) of the objective lens driving device (4) is
The opening of the frame body (43a) is provided with one focus coil (45) having a vertical winding axis and a pair of tracking coils (46) (46) having a horizontal winding axis. These coils
(45) (46) (46) is an air-core coil, in which a pair of tracking coils (46) (46) are bonded and fixed to the outer peripheral surface of the focus coil (45) in advance, and then the focus coil (45) ) Is the frame
The inner peripheral surface of the opening of (43a) is fixed by adhesion. A balance weight plate (47) is fixed to the bottom of the frame body (43a) to prevent the driven portion (42) from rolling during signal recording and reproduction. The frame body (43a) has, on both sides on the objective lens (44) side, protrusions (430) and (430) that protrude outward from both sides on the support section (41) side. As shown in FIG. 4, horizontally extending engaging grooves (431) are respectively formed in the right side surface and the left side surface of the 430 and 430, respectively, so as to be vertically recessed.

The driven part (4) of the objective lens driving device (4)
In 2), the second vertical yoke piece (402) and the magnet (48) are housed in the central cavity of the focus coil (45).
It is arranged on the yoke base (400) so that the third vertical yoke piece (403) and the magnet (49) are housed between the objective lens (44) and the tracking coils (46) (46). Magnet (4
8) (49), the focus coil (45), the second and third vertical yoke pieces (402) (403) form a magnetic circuit through which the magnetic flux from the magnets (48) (49) flows, and the magnet ( Four
8) (49), the tracking coils (46) (46), and the second and third vertical yoke pieces (402) (403) form a magnetic circuit through which magnetic flux from the magnets (48) (49) flows. And the second
A shield plate (404) is arranged across the upper ends of the vertical yoke piece (402) and the third vertical yoke piece (403) to prevent generation of leakage magnetic flux. 1 and 3, the shield plate (404) shown in FIGS. 2 and 4 is omitted for convenience.

The wire spring (5) is a round shaft-shaped arm (50).
And a support member side enlarged portion (54) at the base end of the arm portion (50).
And the lens side enlargement portion (51) is formed at the tip of the arm portion (50). In addition, the lens side enlargement part (51)
The first expanding portion is constituted by the supporting member side expanding portion (54).
The second enlarged portion is constituted by. Wire spring (5)
The support member side enlarged portion (54) of the support member (410) is provided with an engaging groove (41
1) has an engaging portion (55) to be engaged, and a protruding portion (56) to protrude from the engaging groove (411) to the support portion side relay substrate (412) side,
It has a flat shape. On the other hand, the lens-side enlarged portion (51) of the wire spring (5) includes a flat plate portion (52) to be engaged with the engagement groove (431) of the frame body (43a) and an end portion of the flat plate portion (52). It has a frame (43a) and a bending portion (53) that bends in a direction away from the frame (43a), and has an L-shaped cross section.

Enlarged portions (54), (54), (54), (54) of the four wire springs (5), (5), (5), (5) and engaging portions (55), (55), (55) (Five
5) are respectively adhered and fixed to the inner peripheral surface of the engagement groove (411) in a state of being engaged with the engagement groove (411) of the support member (410), while the lens side enlarged portion (51) (51) ) (51) (51) flat plate part (52) (52) (52) (52)
Each of them is adhesively fixed to the inner peripheral surface of the engagement groove (431) while being engaged with the engagement groove (431) of the frame body (43a), so that the support member (410) and the frame body (43a) are They are mechanically linked to each other. The protrusion (56) of the support member side enlarged portion (54) of each wire spring (5) protrudes from the engagement groove (411) to the support portion side relay substrate (412) side, and the solder layer
(58) is connected to the wiring pattern (not shown) of the support side relay board (412). Further, the bent portion (53) of the lens-side enlarged portion (51) protrudes from the engagement groove (431) in a direction away from the side surface of the frame body (43a), and the bent portion (53) has a focus coil.
(45) or tracking coil (46) (46) ends are solder layers
Connected by (57). In this way, the support side relay board (412), the focus coil (45), and the tracking coils (46) (46) form four wire springs (5) (5) (5).
They are electrically connected to each other via (5), and the relay board (412) and the wire springs (5), (5), (5) from the external circuit are connected from the external circuit.
The focus coil (45) and the tracking coils (46) and (46) can be energized via (5).

In the assembling process of the objective lens driving device (4), first, the enlarged portion (5) of the wire spring (5) on the supporting member side.
The engaging portion (55) of 4) is engaged with the engaging groove (411) of the support member (410) to be adhesively fixed to the inner peripheral surface of the engaging groove (411), and the lens of the wire spring (5) The flat plate portion (52) of the side expansion portion (51) is engaged with the engagement groove (431) of the frame body (43a) to be adhesively fixed to the inner peripheral surface of the engagement groove (431). At this time, the engaging portion (55) of the support member side enlarged portion (54) of the wire spring (5) and the flat plate portion (52) of the lens side enlarged portion (51) are respectively engaged with the engaging groove of the support member (410). If it engages with the engaging groove (431) of the (411) and the frame (43a), the wire spring (5)
Is accurately positioned, so positioning is easy.
Further, at this time, the assembly worker can perform the work by sandwiching the projecting portion (56) of the support member side enlarged portion (54) and the bent portion (53) of the lens side enlarged portion (51). Good workability. or,
As described above, the engaging portion (55) of the support member side enlarged portion (54) of the wire spring (5) and the flat plate portion (52) of the lens side enlarged portion (51) are respectively engaged with the engaging groove of the support member (410). (411) and the engaging groove (431) of the frame body (43a) are engaged with each other on the support member (410) and the frame body (4).
Since the wire spring (5) is fixed on the support member (410) and the frame body (43a), the wire spring (5) is securely fixed to the support member (410) and the frame body (43a).

Next, the lens-side magnified portion (5) of the wire spring (5)
The ends of the focus coil (45) and the tracking coils (46) (46) are connected to the bent portion (53) of 1) by a solder layer (57). At this time, the bent portion (53) of the wire spring (5) is formed in the frame body (43a).
Since it is not in direct contact with the
It is difficult to be transmitted to 3a), and deformation of the frame body (43a) due to heat during soldering is prevented. And the protruding portion of the support member side enlarged portion (54)
(56) is connected to the wiring pattern (not shown) of the supporting portion side relay substrate (412) by the solder layer (58) to complete the objective lens driving device (4). At this time, since the support member side enlarged portion (54) of the wire spring (5) is fixed on the support member (410), the wire spring (5) is not displaced from the support member (410), and the workability is good. .

In the above objective lens driving device (4),
As shown in FIG. 1, the current supplied from the external circuit (not shown) to the wiring pattern of the supporting portion side relay substrate (412) is the solder layer.
The focus coil (45) and the tracking coil (46) through the support member-side enlarged portion (54) of the wire spring (5), the arm portion (50), the lens-side enlarged portion (51) and the solder layer (57). ) (46). When current is supplied to the focus coil (45), the focus coil (45) has an electromagnetic field in the focus direction X based on Fleming's left-hand rule in relation to the magnetic field lines generated between the magnets (48) and (49). A force is generated, whereby the driven portion (42) of the objective lens driving device (4) is driven in the focus direction X.

On the other hand, when a current is supplied to the tracking coils (46) (46), an electromagnetic force in the tracking direction Y based on Fleming's left-hand rule is generated in the tracking coils (46) (46). Thus, the driven portion (42) of the objective lens driving device (4) is driven in the tracking direction Y. The pickup device finely adjusts the position of the objective lens (44) in the focus direction X and the tracking direction Y by driving the driven part (42) of the objective lens drive device (4) as described above, and Is condensed by the objective lens (44) and irradiated onto the signal surface of the optical disc.

According to the objective lens driving device (4) of this embodiment, the end portion of the focus coil (45) or the tracking coil (46) is directly connected to the lens side expansion portion (51) of the wire spring (5). Therefore, the driven part side relay board (9) such as the conventional objective lens driving device (8) shown in FIG. 11 can be used.
(9) is unnecessary, and this reduces the number of parts.
Further, the wire spring (5) is provided on the support member (410) and the frame body (43a).
Since it is adhesively fixed on the upper side, the reliability of the fixing strength is higher than that of the conventional objective lens driving device (8) fixed by soldering.

Second Embodiment As shown in FIGS. 7 and 8, the objective lens driving device (6) of the present embodiment is similar to the objective lens driving device of the first embodiment described above in that it has a support portion (41) and a cover. The drive part (42) is connected to each other by two upper wire springs (7a) (7a) and two lower wire springs (7b) (7b), and the upper wire spring (7a) and the lower wire spring (7b) are connected to each other. It has a characteristic configuration in the shape and the assembly process of the device.

FIG. 5 shows a plan view of the upper wire spring (7a) of this embodiment. The upper wire spring (7a) has a round arm-shaped first arm portion (70a) as shown in the figure, and a support member side to be connected to the support member (410) at the base end portion of the first arm portion (70a). The enlarged part (73a) is formed, and the frame body is
A fixing enlarged portion (71a) to be connected to (43a) is formed. The support member-side enlarged portion (73a) constitutes a second enlarged portion, and the support member-side enlarged portion (73a) has the engaging portion (74a) and the protruding portion (75a) as in the first embodiment. have.
And, in the expanding portion (71a) for fixing the upper wire spring (7a),
A round shaft-shaped second arm portion (76a) extending in a direction away from the support member side enlarged portion (73a) is connected, and a focus coil (45) or a tracking coil is attached to a tip end portion of the second arm portion (76a). (46) Enlarged part for coil connection to connect the ends of (46)
(72a) is formed. The fixed expanding portion (71a) and the coil connecting expanding portion (72a) constitute a first expanding portion. The lower wire spring (7b) has basically the same shape as the upper wire spring (7a), and the coil connection expansion part is formed larger than the coil connection expansion part (72a) of the upper wire spring (7a). There is.

7 and 8 show the overall structure of the objective lens driving device (6) of this embodiment. The frame (43a) is
At the lower position of the lens holding frame (43b) as shown,
It has an inclined surface (432) that inclines low on the 1) side and also has a vertical surface (433) connected to the lower side of the inclined surface (432).

The engaging portions (74a) and (74a) of the support member side enlarged portions (73a) and (73a) of the two upper wire springs (7a) and (7a) are respectively recessed on both side surfaces of the support member (410). Two engaging grooves (411a) provided
Among the (411b), in the state of being engaged with the upper engaging groove (411a), is fixed to the inner peripheral surface of the engaging groove (411a) by adhesion, the protrusion (75a)
Protrudes from the engaging groove (411a) to the support portion side relay substrate (412) side and is connected to the wiring pattern (not shown) of the support portion side relay substrate (412) by the solder layer (78a). On the other hand, the fixing enlarged portions (71a) (71a) of the upper wire springs (7a) (7a) are respectively provided with two engaging grooves (431a) recessed on both side surfaces of the frame body (43a).
Of the (431b), it is fixedly adhered to the upper engaging groove (431a) in the engaging groove (431a). The second arm portions (76a) and (76a) of the upper wire springs (7a) and (7a) are respectively frame bodies.
After extending horizontally along the side of (43a), bend downwards,
The coil connecting enlarged portions (72a) (72a) are adhesively fixed to the inclined surface (432) of the frame body (43a), respectively. Upper wire spring (7a)
The end portions of the tracking coils (46) (46) are connected to the coil connecting enlarged portions (72a) (72a) of (7a) by upper solder layers (77a) (77a).

On the other hand, the engaging portions (74b) (74b) of the support member side enlarged portions (73b) (73b) of the two lower wire springs (7b) (7b) are respectively
Lower engagement grooves recessed on both sides of the support member (410)
In the state of engaging with (411b), it is adhesively fixed to the inner peripheral surface of the engaging groove (411b), the protrusion (75b), by the solder layer (78b), the wiring pattern of the support side relay substrate (412) (Not shown). In addition, the expansion part for fixing the lower wire spring (7b) (7b)
(71b) (71b) is engaged with the lower engagement groove (431b) recessed on both side surfaces of the frame body (43a), respectively, in the engagement groove (431b)
It is adhesively fixed to the inner surface of the. And lower wire spring
The second arm portions (76b) and (76b) of (7b) and (7b) are respectively the frame body (43a).
After extending horizontally along the side surface of the coil, it is bent to the vertical surface (433) side, and the coil connecting expansion portions (72b) and (72b) are respectively frame bodies (43a).
It is adhesively fixed to the vertical surface (433). Lower wire spring
The end portions of the focus coil (45) are connected to the coil connecting enlarged portions (72b) and (72b) of (7b) and (7b) by the lower solder layer (77b). Here, the lower solder layer (77b) is the upper solder layer.
It is formed larger than (77a).

FIG. 9 shows an assembling process of the objective lens driving device (6). First, the support members (41a) and (74b) of the support member side enlarged portions (73a) (73b) of the upper wire spring (7a) and the lower wire spring (7b) are respectively attached to the support member (41) as shown in FIG.
0) engaging groove (411a) (411b) to engage the engaging groove (411a) (411
Adhere to the inner peripheral surface of b) and fix the upper wire spring (7a)
Also, the fixing enlarged portions (71a) (71b) of the lower wire spring (7b) are engaged with the engaging grooves (431a) (431b) of the frame body (43a) to engage the engaging grooves (431a) (431b). Adhesively fixed to the inner surface.

Next, the tracking coil (4) is attached to the coil connecting enlarged portion (72a) of the upper wire spring (7a) as shown in FIG.
While connecting the end of 6) by the upper solder layer (77a),
The end portion of the focus coil (45) is connected to the coil connecting enlarged portion (72b) of the lower wire spring (7b) by the lower solder layer (77b) larger than the upper solder layer (77a). At this time, the wire springs (70a) (70b) coil connection expansions (72a) (72b)
Is separated from the frame body (43a), almost no heat is transferred to the frame body (43a) during soldering, and the deformation of the frame body (43a) due to the heat during soldering is reliably prevented. Then, the enlarged portion (7) of the upper wire spring (7a) and the lower wire spring (7b) on the support member side.
3a) (73b) protrusions (75a) (75b), the wiring pattern (not shown) of the support side relay substrate (412) by a solder layer (not shown)
Connect on.

Then, the second arm portion (76a) of the upper wire spring (7a) is horizontally bent along the side surface of the frame body (43a) as shown in FIG. 6C, and then bent downward to form the tracking coil. The coil connecting enlarged portion (72a) to which the end portion of (46) is connected is adhesively fixed to the inclined surface (432) of the frame body (43a). Also, lower wire spring (7b)
The second arm part (76b) of the frame body (43a) is horizontally aligned with the side surface of the frame body (43a) and then bent toward the vertical surface (433) side of the frame body (43a) so that the end of the focus coil (45) is Expanded part for connecting coil (7
2b) is adhesively fixed to the vertical surface (433) to complete the objective lens driving device (6).

In the objective lens driving device (4) of the first embodiment shown in FIGS. 2 and 3 and the objective lens driving device (6) of the present embodiment shown in FIGS. 7 and 8, the optical disk (10) At the time of signal recording / reproduction, the objective lens (44) and the optical disk (10) need to be placed in a position close to each other to some extent, and the laser light that is horizontally incident is changed vertically to a position below the objective lens (44). Since it is necessary to dispose the emitting prism (31), the objective lens (44) is disposed at a position higher than the upper surface of the frame body (43a). Therefore, tentatively, in the objective lens driving device (4) of the first embodiment, the balance weight plate (47)
Is omitted, the driven part (4) of the objective lens driving device (4) is omitted.
The center of gravity of 2) is located at a position higher than the center position P of the driving force generated in the focus coil (45) and the tracking coils (46) (46). Rolling will occur in the driven part (42) of the lens driving device (4).

In the objective lens driving device (6) of the present embodiment, as shown in FIG. 8, the coil connecting enlargement portion in which the end portion of the focus coil (45) is connected by the lower solder layer (77b).
(72b) is fixed at a position lower than the center position P of the driving force. Here, since the lower solder layer (77b) is formed large as described above, it has a large weight. Therefore, the center of gravity of the driven part (42) of the objective lens driving device (6) is lower than that in the objective lens driving device of the first embodiment in which the balance weight plate is omitted, and the center position P of the driving force is P. As a result, the objective lens drive device
The occurrence of rolling of the driven part (42) (6) is suppressed.
As described above, in the objective lens driving device (6) of the present embodiment, the coil connection enlarging portion (72b) and the lower solder layer (77b) serve as balance weights. Therefore, the balance weight plate (47) employed in the objective lens driving device (4) of the first embodiment shown in FIG. 1 is not necessary, which further reduces the number of parts.

The configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims. For example, in the second embodiment described above, the upper wire spring (7a) as shown in FIG. 5 is adopted, but the present invention is not limited to this, and as shown in FIG.
On the support member side expansion part (73a) side of (a), the coil connection expansion part (72
It is also possible to employ a wire spring (79a) with a). In this case, the coil connecting expansion part (72a) connects the end portions of the focus coil (45) or the tracking coils (46) (46) and then connects the second arm part (76a) to the fixing expansion part (71a).
Bend it to the side and fix it on the expansion part (71a) for fixation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of an objective lens driving device of a first example.

FIG. 2 is a plan view showing the objective lens driving device.

FIG. 3 is a side view showing the objective lens driving device.

FIG. 4 is an exploded perspective view showing the overall configuration of the objective lens driving device.

FIG. 5 is a plan view showing a planar shape of a wire spring according to a second embodiment.

FIG. 6 is a plan view showing another embodiment of the wire spring.

FIG. 7 is a plan view showing an objective lens driving device of a second example.

FIG. 8 is a side view showing the objective lens driving device.

FIG. 9 is a process diagram showing an assembly process of the objective lens driving device.

FIG. 10 is a perspective view showing a schematic configuration of an optical disc device.

FIG. 11 is a perspective view showing the overall configuration of a conventional objective lens driving device.

FIG. 12 is a plan view showing the objective lens driving device.

FIG. 13 is a side view showing the objective lens driving device.

[Explanation of symbols]

(4) Objective lens driving device (410) Support member (411) Engagement groove (43a) Frame body (43b) Lens holding frame (431) Engagement groove (44) Objective lens (45) Focus coil (46) Tracking coil (48) Magnet (49) Magnet (5) Wire spring (50) Arm part (51) Lens side magnifying section (54) Support member side enlarged part (57) Solder layer (58) Solder layer

Claims (2)

(57) [Claims] 1. A pickup device which is reciprocally driven in a radial direction of a rotating optical disc to record a signal on the optical disc or reproduce a signal from the optical disc, wherein the pickup device is on a movable table which is reciprocally driven in the radial direction of the optical disc. , A supporting member to which a terminal plate for connecting to an external circuit is attached is fixed, and the supporting member has conductivity 4
The lens holder is elastically supported through the wire spring of the book ,
On the lens holder, an objective lens for irradiating the optical disc with a light beam and a coil to which electric power is to be supplied from an external circuit are attached, and on the moving table, a magnet means is installed to face the coil. In a pickup device that drives a lens holder by energizing a coil from a circuit through a terminal plate and a wire spring,
At the end on the lens holder side, fix it to the lens holder.
Power expansion part and a carp connected to the fixation expansion part.
A coil connecting enlarged portion to which the ends of the
, Two wires on each side of the lens holder.
There are two engaging grooves that are to be engaged with the enlarged fixing part of the spring.
The fixing expansion parts engage with the engaging grooves of the lens holder.
It is attached and fixed on the lens holder in the
The lens connection expansion part is mounted on the lens holder and
The end of the coil can be soldered to the expanded part for coil connection.
Connected to both sides of the lens holder.
Of the two wire springs placed, the lower one
The expansion part for coil connection is at the center of the driving force generated in the coil.
Fixed on the lens holder at a position lower than the
Used to connect the end of the coil to the enlarged part for connecting the coil
The weight of the solder used depends on the objective lens, coil and lens ho
The center of gravity of the driven part composed of
The size is set so that it can roughly match the position.
Pickup apparatus characterized by that. Wherein each wire spring is supported on the end portion of the support member side
While it has an enlarged portion on the holding member side ,
Respectively, the two engagement grooves at least a portion of the support member side enlarged portion of the two wire springs should engagement is recessed, each support
The member-side enlarged portion is adhesively fixed onto the support member in a state of being engaged with each engaging groove of the supporting member, and the terminal plate and each supporting member-side enlarged portion are connected to each other by soldering. The pickup device described in.