JP2004265480A - Position fine adjusting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a position fine adjusting device capable of preventing the positional shifting of a focusing coil middle line, and improving the assembling workability. <P>SOLUTION: Projections 8 and 9 as the movement limitation members of a middle line 32 are formed on a surface (one surface) opposite to a surface (other surface) to which a fixed part 7 is connected, and the positional shifting of the focusing coil middle line of a lens holder 2 is prevented. The insertion work of focusing coils 3a, 3b is executed from the surface to which the fixed part 7 is not connected. Thus, the position fine adjusting device capable of improving the assembling workability is provided. By the projection 9, the flowing-out of an adhesive for fixing the middle line 32 is prevented, and thus the reliability of the device is improved. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a minute position adjusting device, and more particularly to a minute position adjusting device most suitable for an objective lens driving device used in an optical disk device that reads or records information recorded on a recording surface of an optical disk.
[0002]
[Prior art]
As an example of the minute position adjusting device, there is an objective lens driving device used for an optical disk device.
[0003]
In an optical disk device, information is recorded on an optical disk-shaped recording medium, or the recorded information is read and reproduced. This optical disk device can record a relatively large amount of information on a disk, and a recording medium has high rigidity and is easy to handle. Therefore, the optical disk device is used as an external recording device of a computer or a recording device of video and audio.
[0004]
In such an optical disk device, a device that drives an objective lens for condensing light on a recording surface on an optical disk in a focusing direction (direction approaching / separating from the optical disk surface) and a tracking direction (radial direction of the disk) includes an objective lens. It is a driving device.
[0005]
Generally, an objective lens driving device includes a movable portion including an objective lens, a support member that supports the movable portion, and a magnetic circuit including a yoke and a permanent magnet.
[0006]
A focusing coil and a tracking coil are attached to the movable part. By applying a drive current to the focusing coil, the movable part is driven in the focusing direction by an electromagnetic force generated by the action of the magnetic flux from the permanent magnet. Is done.
[0007]
Similarly, by applying a drive current to the tracking coil, the movable portion is driven in the tracking direction by an electromagnetic force generated by the action of the magnetic flux from the permanent magnet.
[0008]
As an example of a conventional technique of such an objective lens driving device, there is a technique described in Patent Document 1.
[0009]
In the technology described in Patent Document 1, an objective lens, a first bobbin portion, and a second bobbin portion are arranged in a lens holder, and the first bobbin portion and the second bobbin portion are separated by a space. , Is arranged.
[0010]
The space is used as an optical path, and light is irradiated onto the optical disk through the objective lens. The first bobbin portion and the second bobbin portion are connected by a connecting portion, and an objective lens is attached to the connecting portion.
[0011]
A focusing coil and a tracking coil are wound around the first bobbin section and the second bobbin section, respectively. That is, the two focusing coils face each other with the space therebetween. Further, the two tracking coils have a structure in which the two tracking coils face each other with a focusing coil interposed therebetween.
[0012]
The light emitted from the light source is reflected by a reflecting mirror disposed below the objective lens in the space, and passes through the objective lens.
[0013]
In addition, a wiring board fixed to a frame (not shown) is attached to a side surface of the lens holder. For this reason, the space is surrounded by a pair of focusing coils and an objective lens, and is irradiated with light from a side surface on which the wiring board is not mounted.
[0014]
[Patent Document 1]
JP-A-11-175992
[Problems to be solved by the invention]
The prior art does not describe how to attach or insert the focusing coil and the tracking coil to the lens holder.
[0016]
Usually, the focusing coil and the tracking coil are attached or inserted into the lens holder in a state where the fixed portion such as the wiring board is attached to one side surface of the lens holder for convenience in manufacturing the apparatus.
[0017]
Here, in the above-described conventional technology, the focusing coil wound around the first bobbin portion and the second bobbin portion requires an intermediate line connected to each other with the space portion interposed therebetween. Similarly, the tracking coil also requires an intermediate line.
[0018]
Therefore, in order to prevent the intermediate line from blocking the space that serves as the optical path, a pair of coils connected by the intermediate line is attached to or inserted into the lens holder from the fixed portion side.
[0019]
However, a minute position adjusting device represented by an objective lens driving device is small and lightweight, and it has been difficult to automatically mechanize mounting or inserting the coil into or out of a lens holder. For this reason, manual work had to be relied on manually, but the work was complicated and hindered the improvement of the efficiency of assembling work of the apparatus.
[0020]
Therefore, there has been a demand for a minute position adjusting device having a structure in which the coil can be easily attached to or inserted into a lens holder.
[0021]
SUMMARY OF THE INVENTION An object of the present invention is to realize a minute position adjusting device capable of preventing a displacement of a focusing coil middle line and improving an assembling workability.
[0022]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows.
[0023]
(1) In the minute position adjusting device, a pair of position adjusting coils connected to each other by an intermediate line, which are supplied with a current and generate a moving driving force by a magnetic flux from a magnetic flux generating member, an objective lens, and the objective lens. Along with the support, an opening for passing light from the light source through the objective lens is formed, and the pair of position adjustment coils are supported at positions facing each other with the opening therebetween. A lens holder on which a movement limiting member for limiting movement of the position adjustment coil toward the opening of the intermediate line is provided.
[0024]
(2) Preferably, in the above (1), the movement restricting member is two projections facing each other, and the intermediate line is arranged between these two projections.
[0025]
(3) Preferably, in the above (1), the projection is formed so as to surround the periphery of the opening.
[0026]
(4) Preferably, in the above (3), a further direction adjustment coil for generating a movement driving force in a direction different from the position adjustment coil is further provided, and the projection supports the other direction position adjustment coil. It has an extension.
[0027]
(5) an objective lens for condensing light on the recording surface of the optical disc, a lens holder for holding the objective lens, and two focusing coils attached to the lens holder so as to face each other with the objective lens therebetween; A plurality of support members connected to the lens holder and the fixed portion, the lens holder operably supporting the fixed portion, and the lens holder passes light from a light source through the objective lens In the objective lens driving device in which an opening for making the focusing portion is formed on the opposite side to the side to which the fixing portion is connected, and two focusing coils are supported at positions facing each other with the opening therebetween. An intermediate line and a terminal line connecting the focusing coils to each other are arranged on the side of the lens holder opposite to the side to which the fixing portion is connected. Movement limiting member that limits the movement between lines are formed.
[0028]
(6) Preferably, in the above (5), the movement restricting member is a pair of projections facing each other on the body, and one of these projections is formed around the opening.
[0029]
As described above, by arranging the intermediate line and the terminal line of the focusing coil on the same side of the lens holder that is farther from the fixed part with respect to the objective lens, the operation of assembling the focusing coil to the lens holder and the operation of the focusing coil The work of connecting the terminal wire and the support member can be performed from the same side of the lens holder, and the assembling workability can be improved.
[0030]
Also, by providing a projection on the side surface of the lens holder where the intermediate line of the focusing coil is arranged, the position of the intermediate line of the focusing coil can be determined, and the displacement of the intermediate line of the focusing coil and the intermediate line of the focusing coil can be determined. The outflow of the adhesive fixed to the lens holder can be prevented.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic exploded perspective view of a minute position adjusting device according to a first embodiment of the present invention, showing an example in which the device is applied to an objective lens driving device of an optical disk device.
[0032]
In FIG. 1, an x-axis direction is a tangential direction of an optical disk (not shown) arranged in the optical disk device, a y-axis direction is a tracking direction which is a radial direction of the optical disk, and a z-axis direction is an optical axis of the objective lens 1. Focusing direction, which is the direction.
[0033]
The objective lens 1 is attached to an objective lens mounting portion formed substantially at the center of the upper surface of the lens holder 2. The lens holder 2 is formed with two focusing coil mounting portions in the y direction with the mounting portion of the objective lens 1 at the center.
[0034]
The pair of focusing coils (a pair of position adjustment coils) 3a and 3b are inserted from an x-direction insertion opening formed in the focusing coil mounting portion, and the lens holder 2 is set so that the center axis direction is the z direction. Attached to.
[0035]
Here, the focusing coils 3a and 3b are inserted into the x-direction insertion opening from a surface side (one surface) opposite to a surface side (the other surface) of the lens holder 2 to which a fixing portion 7 described later is connected. Is done.
[0036]
Further, a set of four tracking coils (other direction adjusting coils) 4a, 4b, 4c, 4d is attached to the lens holder 2 such that the center axis direction of these tracking coils 4a to 4d is the x direction.
[0037]
The coils 4a and 4c are attached to the lens holder 2 so as to oppose each other in the x direction, and the coils 4b and 4d are opposing each other in the x direction.
[0038]
The coils 4a and 4c are attached to the lens holder 2 with the lens 1 interposed therebetween so as to face the coils 4b and 4d in the y direction.
[0039]
One end of the conductive supporting members 6 a, 6 b, 6 c, 6 d having a conductivity is fixed near the end of the plate-shaped fixing portion 7, and the other end is fixed to the lens holder 2. The plate-shaped fixing portion 7 is connected to the other surface side of the lens holder 2 via the supporting members 6a, 6b, 6c, 6d.
[0040]
The terminal lines 31a and 31b of the focusing coils 3a and 3b and the terminal lines 41a and 41b of the tracking coils 4a to 4d are connected to the other ends of the support members 6a to 6d on the connection substrates 21a and 21b attached to the side surfaces of the lens holder 2. The side is electrically connected by a conductive fusion material such as solder.
[0041]
Here, the objective lens 1, the lens holder 2, the focusing coils 3a and 3b, the tracking coils 4a to 4d, and the connection substrates 21a and 21b are movable parts. That is, the movable portion is movable with respect to the fixed portion 7.
[0042]
Of the two side surfaces of the lens holder 2 parallel to the tracking direction, an opening through which light passes is formed on a side surface (one surface) farther from the fixing unit 7 with respect to the objective lens 1.
[0043]
Through this opening, light from an optical system (not shown) can be reflected by a rising mirror disposed below the objective lens 1 and guided to the objective lens 1, thereby reducing the thickness of the optical disk device.
[0044]
The permanent magnets 11a, 11b, 11c and 11d whose magnetization directions are in the x-axis direction in FIG. 1 are attached and fixed to an outer yoke 12 which is a yoke member made of a magnetic material.
[0045]
Then, by assembling the outer yoke 12 and the lens holder 2, the permanent magnets 11a to 11d are arranged on both sides of the lens holder 2 parallel to the tracking direction (y direction).
[0046]
The permanent magnets 11a and 11b and the permanent magnets 11c and 11d are arranged to face each other with the lens holder 2, the focusing coils 3a and 3b, and the tracking coils 4a to 4d therebetween.
[0047]
The inner yokes 10a and 10b extending from the bottom surface of the outer yoke 12 toward the lens holder 2 are disposed inside the focusing coils 3a and 3b when the outer yoke 12 and the lens holder 2 are assembled.
[0048]
As a result, a magnetic circuit is formed in which magnetic fluxes from the permanent magnets 11a to 11d pass from the inner yokes 10a and 10b to the outer yoke 12.
[0049]
In the above-described configuration, when a driving current is applied to the focusing coils 3a and 3b, the movable portion is driven in the focusing direction by an electromagnetic force (moving driving force) generated by the action of the magnetic flux from the permanent magnets 11a to 11d.
[0050]
Similarly, when a drive current is applied to the tracking coils 4a to 4d, the movable part is driven in the tracking direction.
[0051]
Here, as shown in FIGS. 1 and 2, the terminal wires 31 a and 31 b of the focusing coils 3 a and 3 b and the intermediate wire 32 are located on the side of the lens holder 2 farther from the fixed part 7 with respect to the objective lens 1 ( (One surface side).
[0052]
Protrusions 8 and 9 as movement restricting members for the intermediate line 32 are formed above the opening of the lens holder 2 so that the intermediate line 32 does not block the opening.
[0053]
Therefore, the focusing coils 3a, 3b are inserted from the side surface (one surface side) of the lens holder 2 and attached to the lens holder 2, and the terminal wires 31a, 31b of the focusing coils 3a, 3b are connected to the connection substrates 21a, 21b. And the operation of fixing the intermediate line 32 of the focusing coils 3a and 3b to the side surface of the lens holder 2 can be performed from one side surface of the lens holder 2, thereby improving the assembly workability. it can.
[0054]
By inserting the focusing coils 3a, 3b from the side of the lens holder 2, the focusing coils 3a, 3b can be brought closer to the permanent magnets 11a to 11d, so that the driving force can be improved.
[0055]
FIG. 3 is a view for explaining an example in which the focusing coils 3a and 3b are inserted into the lens holder 2 from the surface side (the other surface) to which the fixing portion 7 is connected, different from the present invention.
[0056]
In the example shown in FIG. 3, the operation of inserting and attaching the focusing coils 3a and 3b to the lens holder 2 and the operation of fixing the terminals 33a and 33b of the focusing coils 3a and 3b to the connection substrates 21a and 21b are performed by the lens holder 2 Need to be done from different directions.
[0057]
In the case of FIG. 3, the terminal wires 33a, 33b of the focusing coils 3a, 3b must be routed through the lens holder 2 to the positions of the connection substrates 21a, 21b. There is a risk of being caught on the holder 2.
For this reason, in the case of the example shown in FIG. 3, it is difficult to improve the assembly workability.
[0058]
On the other hand, in the embodiment of the present invention shown in FIG. 2, the terminal wires 31a, 31b of the focusing coils 3a, 3b and the connection substrates 21a, 21b can be on the same side of the lens holder 2, and the terminal wires Even if the wires 31a and 31b do not pass through the lens holder 2, they can be fixed to the connection substrates 21a and 21b.
[0059]
Therefore, the first embodiment of the present invention can improve the assembling workability in this respect as well.
[0060]
Further, in the first embodiment of the present invention, as shown in FIGS. 1 and 4, the focusing coil 3a is provided on the side surface (one surface) of the lens holder 2 farther from the fixed portion 7 with respect to the objective lens 1. And 3b are formed with projections 8 and 9 for restricting the movement of the intermediate line 32 in the vertical direction.
[0061]
The projection 9 is formed so as to surround the periphery of the opening. The projection 8 is formed on the objective lens 1 side, and is formed such that the projections 8 and 9 face each other. However, the interval between the projections 8 and 9 is, of course, not less than the diameter of the intermediate line 32.
[0062]
By passing the intermediate line 32 of the focusing coils 3a and 3b between the projections 8 and 9, it is possible to prevent the intermediate line 32 of the focusing coils 3a and 3b from blocking the opening serving as a light path, and 32 can be easily performed.
[0063]
Further, the adhesive for fixing the intermediate line 32 of the focusing coils 3a and 3b to the lens holder 2 can be prevented from flowing out to the opening provided on the side surface of the lens holder 2.
[0064]
FIG. 5 is a diagram showing an example in which no projection is provided on the side surface of the lens holder 2 unlike the present invention. In the case of the example shown in FIG. 5, if the fixing of the intermediate line 32 of the focusing coils 3a, 3b with an adhesive or the like is not sufficient, the position of the intermediate line 32 is shifted, and the intermediate line 32 is provided on the side surface of the lens holder 2. It may protrude into the opening and block light.
[0065]
Further, in the case of the example shown in FIG. 5, the adhesive may flow out to the opening, and light may be blocked by the flowed-out adhesive.
[0066]
On the other hand, as shown in FIG. 4, according to the first embodiment of the present invention, it is possible to prevent the displacement of the intermediate line 32 of the focusing coils 3a, 3b and the outflow of the adhesive to the opening. And reliability can be improved.
[0067]
Providing the projection 9 around the opening provided on the side surface of the lens holder 2 also has the effect of improving the strength of the opening.
[0068]
As a result, the natural frequency of the elastic deformation mode of the lens holder 2 can be increased and a wide-band control system can be realized.
[0069]
As described above, according to the first embodiment of the present invention, the movement of the intermediate line 32 on the surface side (one surface) opposite to the surface side (the other surface) to which the fixing unit 7 is connected is provided. Since the projections 8 and 9 serving as limiting members are formed to prevent the displacement of the focusing coil intermediate line of the lens holder 2, the operation of inserting the focusing coils 3 a and 3 b can be performed on the surface on which the fixing portion 7 is not attached. Can be done from the side.
[0070]
Therefore, it is possible to realize a minute position adjusting device capable of improving the assembly workability.
[0071]
Since the assembling work of the device can be simplified, the assembling work manually can be conventionally performed by an automatic machine.
[0072]
Further, the protrusion 9 can also prevent the adhesive for fixing the intermediate line 32 from flowing out to the opening, and can improve the reliability of the device.
[0073]
FIG. 6 is a side view of a main part of an objective lens driving device of an optical disk device according to a second embodiment of the present invention.
[0074]
In the second embodiment, not only the protrusion 9 is formed so as to surround the periphery of the opening, but also the extension 9a extending in the longitudinal direction (the y-axis direction in FIG. 1) of the bottom surface of the lens holder 2. , 9b are formed.
Other configurations of the second embodiment are the same as those of the first embodiment, and thus detailed description is omitted.
[0075]
Due to the extensions 9a and 9b, the protrusion 9 has a shape having L-shaped corners, and these corners can be used for positioning the tracking coils 4a to 4d.
[0076]
Therefore, in the second embodiment, in addition to the same effects as those of the first embodiment, there is an effect that the assembling work can be further facilitated.
[0077]
In the example described above, the projections 8 are formed, but the projections 8 can be omitted.
[0078]
The projection 9 is formed around the opening. However, the projection 9 is a side surface of the lens holder 2 where the intermediate line 32 is arranged. If the movement can be restricted, it may be formed in a region other than the periphery of the opening.
[0079]
The intermediate line movement restricting member is not limited to the protrusion, but may be formed with a groove, and the intermediate line 32 may be inserted into the groove.
[0080]
Although the above-described example is an example in which the present invention is applied to an objective lens driving device of an optical disk device, the present invention is not limited to this, and can be applied to other devices for adjusting a minute position.
[0081]
For example, the present invention can be applied to a position adjustment in a laser displacement meter and other devices for adjusting focusing of light.
[0082]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the displacement of the focusing coil intermediate line in the direction of the light passage opening can be prevented, and a minute position adjusting device capable of improving the assembly workability can be realized.
[0083]
Further, since it is possible to prevent the displacement of the focusing coil and the outflow of the adhesive, it is possible to realize a highly reliable minute position adjusting device with good assembling workability.
[Brief description of the drawings]
FIG. 1 is a schematic exploded perspective view of a minute position adjusting device according to a first embodiment of the present invention.
FIG. 2 is an explanatory view of an operation of inserting a focusing coil in the embodiment of the present invention.
FIG. 3 is an explanatory view of an operation of inserting a focusing coil in a configuration different from the present invention.
FIG. 4 is a side view of a main part in the embodiment of the present invention.
FIG. 5 is a side view of a main part in an example of a configuration different from the present invention.
FIG. 6 is an explanatory view of a main part according to a second embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 1 Objective lens 2 Lens holder 3, 3b Focusing coil 4a-4d Tracking coil 6a-6d Support member 7 Fixing portion 8, 9 Projection 9a, 9b Extension portion 10a, 10b Inner yokes 11a-11d Permanent magnet 12 Outer yokes 21a, 21b Connection Substrates 31a, 31b Terminal lines 32 of focusing coil Intermediate lines 41a, 41b of focusing coil Terminal lines of tracking coil

Claims (6)

A pair of position adjustment coils, which are supplied with current and generate a moving driving force by magnetic flux from the magnetic flux generating member, are connected to each other by an intermediate line,
An objective lens,
An opening for supporting the objective lens and passing light from a light source through the objective lens is formed, and the pair of position adjustment coils are supported at positions facing each other with the opening therebetween. A lens holder formed with a movement limiting member that limits movement of the pair of position adjustment coils toward the opening of the intermediate line,
A minute position adjusting device comprising: 2. The minute position adjusting device according to claim 1, wherein the movement restricting member is two protrusions facing each other, and the intermediate line is disposed between the two protrusions. 2. The minute position adjusting device according to claim 1, wherein the projection is formed so as to surround the periphery of the opening. 4. The minute position adjusting device according to claim 3, further comprising: a different direction position adjusting coil for generating a moving driving force in a direction different from the direction of the position adjusting coil, wherein the protrusion supports the other direction position adjusting coil. A minute position adjusting device comprising: An objective lens for condensing light on the recording surface of the optical disc, a lens holder for holding the objective lens, two focusing coils attached to the lens holder so as to face each other with the objective lens therebetween, and a lens holder. The lens holder has a plurality of support members connected to the fixed part and operably supporting the lens holder with respect to the fixed part.The lens holder has a light source for passing light from a light source through the objective lens. In an objective lens driving device, wherein an opening is formed on a side opposite to a side to which the fixed part is connected, and two focusing coils are supported at positions facing each other with the opening therebetween.
An intermediate line and a terminal line connecting the two focusing coils are arranged on the side of the lens holder opposite to the side to which the fixed portion is connected, and the opposite side has a movement that restricts the movement of the intermediate line. An objective lens driving device, wherein a limiting member is formed. 6. The objective lens driving device according to claim 5, wherein the movement restricting member is a pair of projections facing each other, and one of the projections is formed around the opening. Objective lens drive.

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