JPH0831008A - Production of optical pickup device - Google Patents

Abstract

PURPOSE:To improve assembly efficiency and to join connecting members with good accuracy by spanning a supporting base and a lens holder with connecting members using auxiliary members, to which the connecting members are previously fixed. CONSTITUTION:The lens holder 1 having an objective lens 2 for irradiating an optical disk with a light spot and a driving coil 5 is oscillatably supported at the supporting base 8 by the connecting members 6A, 6B, 7A, 7B having a repulsive property. The connecting members 6A, 6B, 7A, 7B consist of materials having the rigidity higher than the rigidity of the connecting members and fix both ends of the auxiliary members 24 having a prescribed length and span and fix the supporting base 8 and the lens holder 1 with the auxiliary members 24. The lens holder 1 is oscillatably supported by cutting and removing part of the auxiliary members 24. Handling of the connecting members 6A, 6B, 7A, 7B is thereby facilitated and mispositioning, etc., are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an optical pickup device for recording / reproducing information on / from an optical disk, a magneto-optical disk or the like.

[0002]

2. Description of the Related Art Generally, for example, in a pickup for an optical disk, a reading or writing beam is used.
Since it is necessary to irradiate the optical disk surface in a focused state through the objective lens and to follow this beam in the track direction of the optical disk, the objective lens is a tracking direction orthogonal to the focus direction which is the optical axis direction thereof. It is movably supported in the direction.

As a method of movably supporting this objective lens on the optical pickup body, there have been conventionally known spring type and sliding type. Further improvements have been made, for example, in JP-A-63-1.
Wire type (4W
Formula) is known.

Here, the conventional optical pickup device will be described with reference to the conventional FIG.
Has an objective lens 2 for forming a light spot at its tip, and a pair of drive coils 5 including a focus coil 3 and a tracking coil 4 is provided on the side of the objective lens 2.

This lens holder 1 has a thin connecting member 6 of 2 to 4 made of, for example, a conductive metal wire material having elasticity.
A, 6B, 7A, and 7B support the support base 8 in a floating state so as to be swingable. The support base 8 is connected and fixed to the base plate 9 at its lower portion, and
A yoke 10 is erected so as to be opposed to the drive coils 5 and a magnet 11 is attached to the yoke 10. Further, the support base 8 can be moved in the radial direction of the recording medium D by, for example, a screw screw 12.

In such a configuration, a drive signal is passed through the drive coil 5 to form a magnetic circuit between the drive coil 5 and the magnet 11, and the lens holder 1 moves in the focus direction and the tracking direction according to the drive signal. In this direction, the recording medium D such as an optical disk and the objective lens 1 are adjusted in position.

Here, a conventional method of manufacturing an optical pickup device will be described with reference to FIGS. First, in FIG. 9, an assembly jig 1 formed in an L shape having a support base fixing portion 13 and a lens holder fixing portion 14 is formed.
5, the support base 8 and the lens holder 1 are attached and positioned, and this is temporarily fixed by the temporary fixing portion 16 which is slidable. A drive coil 5 is insert-molded in advance in the lens holder 1.

Next, the connecting member 6 which is linear
A, 6B, 7A, and 7 are inserted holes 17 formed in the support base 8 and inserted holes 1 provided at the end of the lens holder 1.
Insert in 8. Then, this connecting member is fixed by solder or adhesive, and when a drive signal is supplied by this connecting member, the connecting member and the drive coil are electrically connected here. FIG. 10 is a cross-sectional view when the connecting member is inserted and soldered, and FIG. 11 is a cross-sectional view taken along the line AA in FIG.

In this case, relay substrates 19 and 20 are provided in advance on the ends of the support base 8 and the lens holder 1, respectively, and after insert molding, the coil end 5A and the ends of the connecting members, for example, 6B and 7B. The parts are connected to the exposed patterns (lands) of the relay board 20 by solders 21A and 21B, respectively, and the pattern of the relay board 19 on the support base 8 side and each connecting member are connected and fixed by solder 21C. As described above, the reason why the relay substrate 20 on the lens holder 1 side is particularly necessary is that it is very difficult to form the coil substrate so that it is exposed in a connectable state.

When the connection of the respective members is completed in this way, the assembled parts are taken out from the assembly jig 15 and the support base 8 is fixed to the base plate 9 by screws or the like. When a large amount of such an apparatus is to be produced, a large number of the assembling jigs 15 as described above are prepared so that the steps are divided and the assembly and production are carried out in a flow work.

[0011]

However, the conventional manufacturing method as described above has the following problems because the connecting member is soldered. First, the wire-shaped connecting member expands and contracts due to the heat of soldering, which causes the fixing position of the connecting member to fluctuate, resulting in deterioration of characteristics.

Further, the work area is limited to a relatively small area due to the soldering after the insert molding, and the positional deviation occurs when the solder and the soldering iron are pressed.
Further, since the connecting member itself is a very thin wire, there are the following problems. That is, not only a special technique is required for handling because the flexible wire is handled as described above, but also the connecting member may be fixed in a bent state due to an insertion error or the like when the wire is inserted into the insertion hole. . In addition, after the connection and fixing of the connecting member, the product may be deformed due to careless handling before the final product is completed.

The present invention focuses on the above problems,
The present invention has been devised to effectively solve this problem, and an object thereof is to provide a method of manufacturing an optical pickup device that can easily handle a connecting member.

[0014]

In order to solve the above-mentioned problems, a first aspect of the present invention provides a lens holder having an objective lens and a drive coil for irradiating a light spot on an optical disk with elasticity. In an optical pip-up device swingably supported by a connecting member with respect to a support base, the connecting member is provided at both ends of an auxiliary member made of a material having higher rigidity than the connecting member and having a predetermined length. And fixing the auxiliary member to which the connecting member is fixed,
It is configured such that the lens holder is swingably supported by bridging and fixing between the support base and the lens holder, and then by cutting and removing a part of the auxiliary member.

According to a second aspect of the present invention, a lens holder having an objective lens for irradiating a light spot on an optical disc and a drive coil is attached to a support base by a connecting member having elasticity and allowing a drive signal to flow. In a method of manufacturing an optical pip-up device that is swingably supported by an optical fiber, one end of a printed circuit board having a relay pattern having a length larger than a space between the support base and the lens holder is provided. The drive coil is electrically connected to the relay pattern, and then the printed circuit board is bridged between the support base and the lens holder to integrally form them, and then tension is applied to the connecting member. Is applied to the relay pattern to fix the connecting member, and then a part of the printed circuit board is cut and removed. It is obtained by configured to swingably support the lens holder by removing.

[0016]

According to the first aspect of the present invention, first, the connecting member is fixed to both ends of the auxiliary member having a predetermined length by spot welding or the like and is bridged, and the auxiliary member is hung between the support base and the lens holder. This auxiliary member is cut after passing and integrally molding. Therefore, it is not necessary to perform a complicated operation such as inserting the connecting member into a small insertion hole, no special technique is required for handling, and the possibility that the connecting member is deformed can be reduced. .

According to the second aspect of the invention, the drive coil is connected to the relay pattern of the printed board in advance, the printed board is hung between the support base and the lens holder to be integrally molded, and then tension is applied. In the state of connecting the connection member by connecting it between the relay patterns of the board, and then
This printed circuit board is cut. Therefore,
Similar to the above-mentioned invention, it is not necessary to perform a complicated operation such as inserting the connecting member into the insertion hole, and the connecting member can be stretched relatively easily.

[0018]

EXAMPLE An example of a method of manufacturing an optical pickup device according to the present invention will be described below. FIG. 1 is a perspective view showing an optical pickup device manufactured by the first invention method,
2 is a perspective view showing a manufacturing process of a main part of an optical pickup device manufactured by the first invention method, FIG. 3 is a perspective view showing a state in which a connecting member is fixed to an auxiliary member, and FIG. 4 is a support base. It is a perspective view. The same parts as those of the general optical pickup device shown in FIG. 8 are designated by the same reference numerals.

As shown in FIG. 1, the basic construction of the optical pip-up device 22 is substantially the same as that of the optical pickup device shown in FIG. That is, the lens holder 1 has an objective lens 2 for forming a light spot at its tip, and a pair of drive coils 5 including a focus coil 3 and a tracking coil 4 are provided on both sides of the objective lens 2.

This lens holder 1 has a thin connecting member 6 of 2 to 4 made of, for example, a conductive metal wire material having elasticity.
A, 6B, 7A, and 7B support the support base 8 in a floating state so as to be swingable. The support base 8 is fixed to the base plate 9 with screws 23, and a yoke 10 is erected on the base plate 9 so as to face the drive coils 5, and the magnet 11 is attached to the yoke 10.
Is installed. Further, the support base 8 can be moved in the radial direction of the optical disc D by a screw screw 12, for example. Particularly, in the method of the present invention,
An I-shaped auxiliary member 24 is used to connect the connecting members 6A, 6B, 7A, 7B to facilitate this handling.

A method of manufacturing the optical pickup device 22 thus constructed will be described. First, as shown in FIG. 3, square or rectangular windows 26 are continuously formed at predetermined intervals on an auxiliary member strip 25 made of a strip-shaped sheet metal or a resin such as vinyl chloride having a predetermined width L1. The wire-shaped connecting members 6A and 6B made of, for example, phosphor bronze so as to cross the window 26 in the width direction of the strip plate 26 have a constant tension, for example, within a range of 100 g to 250 g, preferably within a range of 150 g to 200 g. They are bridged while applying tension, and both ends are fixed by spot welding 27. Here, a material having a higher rigidity than that of the connecting member is used as the band plate 25 so that the auxiliary member band plate 25 is not bent by the tension of the connecting member. The diameter of the connecting member is approximately 8
0 μm.

Then, the strip 25 is formed at the substantially central portion of each window 26.
A single I-shaped auxiliary member 24 is formed by cutting along a cutting line 28 shown in the width direction of FIG. When forming a large number of the auxiliary members 24, the auxiliary members strips 25 are intermittently synchronized in the longitudinal direction while intermittently pulling out the connecting members from the reels 28 and 29 around which the long connecting members 30 and 30 are wound. The connection members 30 and 30 may be fixed by spot welding each time. Then, as described above, a large number of auxiliary members can be obtained by cutting the strip 25 along each cutting line 28. A large number of holes formed on both sides of the auxiliary member strip 25 are machine feed holes 31 for continuously mechanically feeding them.

When the auxiliary member 24 is formed as described above, a set of two auxiliary members 24 is formed into a portion for molding a support base of an injection molding die (not shown) and a portion for molding a lens holder. They are bridged and integrally molded so that the portion of the connecting member 30 is exposed. In this case, the drive coils 5 and 5 are also insert-molded at the same time. The state at this time is shown in FIG. 2, and auxiliary members are attached to the upper surface side and the lower surface side, respectively.

In this state, when the molded body is fixed to the base plate 9 as shown in FIG. 4 with screws 23, or when a drive signal is sent to the connecting member, the coil ends of the drive coils 5 and 5 are set to the above. The other remaining steps such as soldering to the auxiliary member 24 are performed, and at the final stage of assembly, two connecting portions 32 connecting both ends of the auxiliary member 24 are cut using, for example, a laser cutter not shown. Remove by cutting at lines 33, 33. This cutting is performed by using the upper and lower two auxiliary members 2
Do about 4. As a result, the lens holder 1 is swingably supported only by the four connecting members 6A, 6B, 7A, 7B.

Further, the drive coils 5, 5 are connected through the connecting members.
When a drive signal is supplied to, the central portion of the two auxiliary members 24 is cut along the cutting line 34 in order to electrically separate the respective coil connection ends by a laser cutter or the like. In this case, it goes without saying that the auxiliary member is made of a conductive metal. When the auxiliary member is made of an insulating material such as polyvinyl chloride, the cutting line 34
Although it is not necessary to cut along with, a separate flexible wire is connected to each drive coil in order to supply a drive signal.

As described above, the connecting member 30 is fixed to the auxiliary member 24 in advance by spot welding or the like, and the auxiliary member 24 is fixed so as to be bridged between the support base 8 and the lens holder 1, and then the auxiliary member 24 is fixed. Connection part 32 of auxiliary member 24
Since it is cut and removed, it is not necessary to insert the connecting member into the hole, which was conventionally required, and this handling is not only easy, but also the possibility of bending the connecting member is greatly reduced. Can be made. Furthermore, since the soldering operation can be eliminated as described above, it is possible to suppress the occurrence of positional deviation such as variation in the fixed position due to thermal expansion and contraction of the connecting member.

Also, at the final stage of assembly, the auxiliary member 24
Since the lens holder 1 is supported by removing the connecting portion 32 of, the lens holder 1 is fixed to the support base 8 via the auxiliary member 24 in each step in the middle, and the lens holder 1 is connected even if care is not taken. The risk of the member bending can be almost eliminated. In the above embodiment, the lens holder 1 of the auxiliary member 24 and the support base 8
Although the method of fixing to the above has been described as being performed by insert molding with resin or the like, the method is not limited to this, and it is needless to say that it is not limited to the method such as bonding with an adhesive, thermocompression bonding, and screwing.

Next, the second invention method will be described.
5 is a plan view showing an optical pickup device manufactured by the second invention method, FIG. 6 is a perspective view showing a state in which a printed circuit board and a drive coil are connected, and FIG. 7 is a state in which a connecting member is connected. It is an explanatory view shown. The same parts as those of the device shown in FIG.

In the optical pickup device 22 shown in FIG. 1, two pairs of upper and lower connecting members 6A, 6B and 7A, 7B are used.
Of the optical pickup device 36 shown in FIG. 5, the connecting members 6A, 6B and 7A, 7B are brought closer to each other toward the lens holder 1 respectively. A printed circuit board 40, which is stretched and constitutes a so-called trapezoidal link mechanism, and which has a pair of support base side relay patterns 37, 38 and a lens holder side relay pattern 39 in place of the auxiliary member 24 shown in FIG. The points used are shown in FIGS. 1 and 2.
Unlike the device shown in FIG. 3, the other parts have substantially the same configuration.

In order to manufacture the optical pickup device 36, first, as shown in FIG. 6, a printed board 40 made of, for example, glass epoxy resin in a substantially triangular shape is used, and the bottom of the triangular printed board 40 is used. A pair of support base relay patterns 37 and 38 are provided by forming solder plating on the portions corresponding to both ends of
A patterned lens holder-side relay pattern 39 to which the coil ends are connected in a later step is provided at a portion corresponding to the apex angle.

The two printed circuit boards 40 and 40 thus formed are arranged in parallel with their relay patterns facing outward, and each drive coil 5, that is, each coil end of the focus coil 3 and the tracking coil 4. Are soldered in advance to the corresponding relay patterns 39, 39 on the lens holder side of the two printed boards 40, 40.

Now, when the joining of the drive coils 5 and 5 is completed as described above, the two printed circuit boards 40 and 4 are joined.
For example, 0 is set over the portion for molding the support base of the injection mold such as a resin (not shown) and the portion for molding the lens holder, and these are integrally molded including the drive coil. In this case, the printed circuit board 40 is embedded inside with the relay patterns 37, 38, 39 exposed. The embedding state at this time is shown in FIG. The lens holder 1 and the support base 8 are connected to each other via the printed circuit board 40,
Further, connecting member accommodating grooves 41 and 41 whose bottoms are formed in the same horizontal plane are formed so as to connect the lens holder side relay pattern 39 and the support base side relay patterns 37 and 38. Further, the objective lens 2 may be attached to the lens holder 1 in this state.

Next, the connecting members 6 and 7 are connected to the molded body thus formed from both upper and lower surfaces thereof. That is, the long linear connecting members 6 and 7 are hooked on the support pins 42 and 43 in a V shape, and in this state, the tips of the support pins 42 and 43 are provided in the vicinity of the relay patterns 39 on the lens holder side. The connecting member 6,
7 is bridged between the lens holder side relay pattern 39 and each of the support base side relay patterns 37 and 38 for positioning. Then, a predetermined tension, for example, a tension within a range of 100 g to 250 g, preferably a tension within a range of 150 g to 200 g, is applied to both ends of each of the connecting members 6 and 7, and a welding means such as a heater chip 45 is used. Relay patterns 37, 3 corresponding to the connecting members 6, 7, respectively
Welded to 8 and 39. The diameter of the wire-shaped connecting member at this time is about 80 μm.

Next, for example, a laser cutter is used to cut the folded portions of the connecting members 6 and 7 that were in contact with the support pins 42 and 43 to cut off the electrical connection on both sides, and the laser cutter is used to connect the support base 8 to the support base 8. The printed circuit board 40 exposed between the lens holder 1 and the lens holder 1 is shown in FIG.
The connecting portion 40A is removed by cutting along the cutting lines 45 and 46 of the book. As a result, the lens holder 1
The book can be swingably supported by the connecting members 6A, 6B, 7A, 7B. Then, the supporting base 8 is fixed to the base plate 9 with screws or the like, whereby the whole is completed.

As described above, also in the method of the second aspect of the present invention, it is possible to dispense with the operation of inserting the connecting member into the hole, which is conventionally required, and not only the handling is easy, but also the possibility of bending the connecting member. Can be significantly reduced. In addition, since the welding of each connecting member is performed with tension applied thereto, the connecting position does not shift, and therefore,
It is possible to significantly suppress the occurrence of problems such as deterioration of characteristics due to the positional deviation.

Although the glass epoxy resin is used as the printed circuit board in the above embodiment, the present invention is not limited to this.
Any material can be used as long as it is an insulating material and has a hardness that can support the lens holder 1 with respect to the support base 8 in the middle of the process.

[0037]

As described above, according to the optical pickup device of the present invention, the following excellent operational effects can be exhibited. According to the first aspect of the invention, since the connecting member is bridged between the support base and the lens holder by using the auxiliary member to which the connecting member is fixed in advance, it is easy to handle the flexible connecting member. Not only can the assembly efficiency be improved, but the possibility of bending thereof can be greatly reduced. Further, since there are less restrictions on the space and spot welding or the like other than soldering can be used, it is possible to suppress the occurrence of the displacement of the fixed position due to the thermal expansion and contraction of the connecting member. Further, unlike the conventional method, the joining of the connecting members can be performed accurately in a separate step, so that the positional deviation can be prevented more from this point, and therefore, the characteristic deterioration due to the positional deviation can be prevented. it can. According to the second aspect of the invention, the connecting member is stretched in a state in which the support base and the lens holder are integrally connected by the printed circuit board that also serves as the relay board. Therefore, this handling is greatly facilitated and assembly is performed. Not only can the efficiency be improved, but also the possibility that the connecting member will bend can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an optical pickup device manufactured by a first invention method.

FIG. 2 is a perspective view showing a manufacturing process of a main part of an optical pickup device manufactured by the first invention method.

FIG. 3 is a perspective view showing a state in which a connecting member is fixed to an auxiliary member.

FIG. 4 is a perspective view showing a support base.

FIG. 5 is a plan view showing an optical pickup device manufactured by the second invention method.

FIG. 6 is a perspective view showing a state in which a printed circuit board and a drive coil are connected.

FIG. 7 is an explanatory diagram showing a state when connecting a connecting member.

FIG. 8 is a perspective view showing a general optical pickup device.

FIG. 9 is a diagram for explaining a manufacturing method of the optical pickup device shown in FIG.

FIG. 10 is a cross-sectional view showing a portion of a connected connecting member.

11 is a sectional view taken along the line AA in FIG.

[Explanation of symbols]

1 ... Lens holder, 2 ... Objective lens, 3 ... Focus coil, 4 ... Tracking coil, 5 ... Drive coil, 6
A, 6B, 7A, 7B ... Connecting member, 8 ... Support base, 9
... Base plate, 22, 36 ... Optical pickup device, 24
... auxiliary member, 25 ... auxiliary member strip, 27 ... spot welding, 28, 29 ... reel, 32 ... connecting part, 33, 34 ...
Cutting lines, 37, 38 ... Support base side relay pattern, 39
… Lens holder side relay pattern, 40… Printed circuit board,
40A ... Coupling part, 45, 46 ... Cutting line, D ... Optical disk (recording medium).

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 7, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014]

In order to solve the above-mentioned problems, a first aspect of the present invention provides a lens holder having an objective lens and a drive coil for irradiating a light spot on an optical disk with elasticity. In an optical pickup device which is swingably supported by a connecting member with respect to a support base, the connecting member is fixed to both ends of an auxiliary member made of a material having higher rigidity than the connecting member and having a predetermined length. The auxiliary member to which the connecting member is fixed,
It is configured such that the lens holder is swingably supported by bridging and fixing between the support base and the lens holder, and then by cutting and removing a part of the auxiliary member.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

According to a second aspect of the present invention, a lens holder having an objective lens for irradiating a light spot on an optical disc and a drive coil is attached to a support base by a connecting member having elasticity and allowing a drive signal to flow. In a method for manufacturing an optical pickup device that is swingably supported by a lens, a printed wiring board having a relay pattern at both ends thereof having a length larger than a distance between the support base and the lens holder is provided. The drive coil is electrically connected to the relay pattern, and then the printed board is bridged between the support base and the lens holder to integrally form them, and then tension is applied to the connecting member. In the state where it is added, it is hung between the relay patterns to fix the connecting member, and then a part of the printed circuit board is cut and removed. It is obtained by configured to swingably support the lens holder by removing.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

As shown in FIG. 1, the basic structure of the optical pickup device 22 is substantially the same as that of the optical pickup device shown in FIG. That is, the lens holder 1 has an objective lens 2 for forming a light spot at its tip, and a pair of drive coils 5 including a focus coil 3 and a tracking coil 4 are provided on both sides of the objective lens 2.

Claims (3)

[Claims] 1. An optical pip-up in which a lens holder having an objective lens and a drive coil for irradiating a light spot on an optical disc is swingably supported by a support base by a coupling member having elasticity. In the device, the connecting member is fixed to both ends of an auxiliary member made of a material having higher rigidity than the connecting member and having a predetermined length, and the auxiliary member fixed to the connecting member is connected to the support base. I hang it between the lens holders and fix it,
After that, a part of the auxiliary member is cut and removed to support the lens holder so that the lens holder can swing. 2. A lens holder having an objective lens for irradiating a light spot on an optical disc and a drive coil is swingable with respect to a support base by a connecting member having elasticity and allowing a drive signal to flow. In the method for manufacturing an optical pip-up device, the relay pattern having a length larger than a distance between the support base and the lens holder and having relay patterns at both ends thereof is formed on the relay pattern at one end. The drive coil is electrically connected, then the printed circuit board is bridged between the support base and the lens holder to integrally form these, and then the drive coil is bridged between the relay patterns. Fix the connecting member and then cut and remove a part of the printed circuit board to support the lens holder swingably. A method of manufacturing an optical pickup device, which is configured as described above. 3. The method of manufacturing an optical pickup device according to claim 1, wherein when the connecting member is fixed, the connecting member is fixed with tension applied.