JP2001227931A - Apparatus for measuring and adjusting parallelism of guide shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for measuring and adjusting the parallelism of guide shafts capable of properly detecting and maintaining the parallelism without causing distortion of a chassis even if an inexpensive contact type parallelism detecting means is used. SOLUTION: In the apparatus, the first and second guide shafts 7 and 8 arranged in parallel and spaced relation for movably supporting an optical pickup 2 are supported by supporting parts along the surface of the chassis 3 in such a way as to be movable in a direction perpendicular to the surface of the chassis 3. The apparatus includes contact type parallelism detecting means 51 to 54 for detecting the parallelism of the first and second guide shafts 7 and 8 relative to the surface of the chassis 3, paralleling drive means 36a to 36c for individually driving the supporting parts of the first and second guide shafts 7 and 8 according to the detection outputs of the detecting means, and a distortion correcting means 56 for correcting the distortion of the chassis 3 at the detection of the parallelism, thus avoiding distortion of the chassis when the parallelism is detected by the contact type parallelism detecting means 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an optical disk device,
Especially DVD (Digital Versatile or VideoDisk)
The present invention relates to a guide axis parallelism measurement adjustment device suitable for tilt adjustment of an optical disk device corresponding to a high-density recording medium as described above.

[0002]

2. Description of the Related Art Generally, in an optical disk apparatus, information is recorded or reproduced by irradiating an optical disk with a light beam by an optical pickup while rotating the optical disk by a spindle motor. The optical pickup is guided by two guide shafts (first and second guide shafts) extending in a radial direction so as to irradiate an arbitrary track on the optical disk with a light beam, and is provided to be capable of seek movement. Have been.

Here, with respect to a conventional optical disk such as a CD, a laser wavelength used in an optical pickup is 780 nm.
m, the track pitch is about 1.6 μm, and the recording density on the optical disk is relatively low. Therefore, the tolerance of the optical tilt (tilt) of the optical pickup with respect to the optical disk surface is large, and the accuracy of each component is single. If the processing accuracy is kept within the processing accuracy, the product will be at a level where the tilt of the optical pickup does not pose a problem as the overall accuracy after assembly.

However, in recent years, high density recording optical disks such as DVDs having a higher recording density have been put to practical use. In response to the increase in recording density, the laser wavelength used in the optical pickup is as short as 650 nm. And the track pitch is also reduced to about 0.74 μm, and strict standard conditions are required. Correspondingly, severe conditions have been imposed that the tilt of the optical pickup must be suppressed to about half that of the conventional CD.

Conventionally, various proposals have been made for such a tilt adjusting device. Typical examples thereof include, for example, Japanese Utility Model Laid-Open No. 2-46921 (see Japanese Utility Model Registration Publication No. 2519288) and Japanese Patent Application Laid-Open No. 9-22335.
No. 3, Japanese Patent Application Laid-Open No. 10-208372, etc., a two-axis adjustment method using a spindle motor, for example, a two-point adjustment method disclosed in Japanese Patent Application Laid-Open No. 9-198687, etc. There is a three-point adjustment method disclosed in JP-A-25466.

For example, in the case of a three-point adjustment system disclosed in Japanese Patent Application Laid-Open No. H11-25466, a fixed support portion to which one end of a main guide shaft is mounted and another end of the main guide shaft are mounted so as to be adjustable in height. A first variable support portion, a second variable support portion having one end of a sub-guide shaft attached to be freely adjustable in height, and a third variable support portion having the other end of the sub-guide shaft attached to be freely adjustable in height. Consists of Then, the optical disc is placed on the turntable in a reading state, and the optical pickup is moved toward the turntable to monitor the jitter of the optical disc and adjust the first variable support section to minimize the jitter. By doing so, the radial tilt of the optical pickup is adjusted. In the same state, the tangential tilt of the optical pickup is adjusted by monitoring the jitter of the optical disk and adjusting the second variable support portion so as to minimize the jitter. Further, the tangential tilt of the optical pickup can be reduced by adjusting the third variable support portion so as to minimize the jitter while monitoring the jitter of the optical disc while the optical pickup is moved to the outer peripheral side away from the turntable. It is to adjust.

[0007]

However, in the case of such a three-point adjustment system, a pair of guide shafts are perpendicular to the optical disk surface (with respect to the chassis surface).
If there is no guarantee that the optical pickup is parallel and there is a twist, the tangential tilt amount changes depending on the position of the optical pickup in the radial direction of the disc. Must be adjusted, and it takes a long time for the adjustment to converge.

That is, in an optical disk device such as a DVD, precise positioning accuracy is required for the two guide shafts supporting the optical pickup, and processing accuracy for supporting the guide shafts is not sufficient.

For this reason, a proposal has been made by the present applicant as Japanese Patent Application No. 11-178007 in which the parallelism of the first and second guide shafts is adjusted in the process of assembling the optical disk device. The contents of this proposal example will be described with reference to FIGS. FIG. 4 is an exploded perspective view showing a schematic configuration around a chassis 3 for mounting the spindle motor 1 and the optical pickup 2 in the optical disk device of the proposed example, and FIG. 5 is a plan view thereof.

The chassis 3 having four bent pieces 4 of substantially rectangular shape and having the same height for the legs, which is built in the inner part of the optical disk device, is located at a position substantially at the center of the optical disk device. A mounting hole 5 for mounting the spindle motor 1 is formed. Reference numeral 6 denotes a turntable located at the tip of the spindle motor 1 for mounting an optical disk (not shown). Further, a pair of first and second round rods of substantially the same length, which are paired, are arranged on the chassis 3 on both sides of the mounting hole 5 to support the optical pickup 2 movably in the radial direction of the optical disk. The guide shafts 7, 8 are mounted in a state of being parallel in a plan view. The support mechanism for the first and second guide shafts 7 and 8 will be described later. Here, on both sides of the optical pickup 2 having the objective lens 9 at a linear position passing through the mounting hole 5, bearing portions 10 slidable by a two-point support method with respect to the first guide shaft 7 are formed. A slidable bearing 11 is formed on the second guide shaft 8 by a one-point support system. In the chassis 3, a large opening 12 is formed outside the mounting hole 5 so as not to hinder the movement of the optical pickup 2 and the like in the radial direction.

A rack 13 is mounted outside the optical pickup 2 on the bearing 10 side.
The lead screw 14 meshing with the screw holder 15 and the screw holder portion 16 are parallel to the first guide shaft 7.
And is supported on the chassis 3. A lead gear 17 is attached to a part of the lead screw 14, and a seek motor 19 having a motor gear 18 meshing with the lead gear 17 is attached to the chassis 3 via a bracket 20. Therefore, when the seek motor 19 rotates, the lead screw 14 rotates via the motor gear 18 and the lead gear 17, and the optical pickup 2 moves the first and second guide shafts 7, 8 by the rack 13 meshing with the lead screw 14. In the radial direction with respect to the optical disk. It moves in the center direction or the outer peripheral direction according to the rotation direction.

Next, a support mechanism for the first and second guide shafts 7 and 8 will be described. First, one end of the first guide shaft 7 on the spindle motor 1 side is rotatable vertically (in a direction perpendicular to the surface of the chassis 3) in a minute range by a fixed support mechanism 21 attached to the chassis 3. It is supported by. As a specific structure, for example, one end of the first guide shaft 7 may be formed into a spherical shape and fitted into the fixed support mechanism 21 (for example, see FIG. 3 in JP-A-9-198687). . The other end of the first guide shaft 7 is
Are movably supported in the vertical direction by the support mechanism 22. That is, the first guide shaft 7 is supported by the first support mechanism 22 so as to be vertically displaceable about a portion supported by the fixed support mechanism 21.

The first support mechanism 22 has a frame shape screwed to the chassis 3 so as to receive the other end of the first guide shaft 7 so as to be displaceable only in the vertical direction while restricting lateral movement. A leaf spring 24 screwed to the chassis 3 so as to press the first guide shaft 7 located in the holder portion 23 downward (toward the chassis 3);
Screw hole 25 of chassis 3 at a position directly below guide shaft 7
(See FIG. 6), and is provided with an adjusting set screw 26 that can be advanced and retracted with respect to the first guide shaft 7 by screwing. A hexagonal recess (not shown) is formed at a lower end of the set screw 26 exposed to the outside of the chassis 3 so that a hexagonal adjustment bit 27 can be locked. Therefore, the first guide shaft 7
Is held down by the leaf spring 24, the set screw 26
The position (height) of the set screw 26 is regulated by adjusting the position (height) of the set screw 26 so that the first
The height of one end of the guide shaft 7 can be arbitrarily adjusted.

Further, one end of the second guide shaft 8 on the outer peripheral side in the radial direction of the disk is movably supported in the vertical direction by a second support mechanism 28 and the other end on the inner peripheral side by a third support mechanism 29. . These second and third support mechanisms 28 and 29 are structurally and functionally similar to the first support mechanism 22. The leaf springs 24 for the first and second support mechanisms 22 and 28 are formed integrally.

Such support mechanisms 21, 22, 28, 2
Regarding the first and second guide shafts 7 and 8 supported by 9, in the tilt adjusting device of the proposed example, the parallelism as shown in FIG. 7 and FIG. First and second guide shafts 7 and 8 are detected by using a detecting means.
After adjusting the parallelism in the vertical direction (parallelism in the vertical direction with respect to the optical disk surface and the chassis 3 surface) between them, radial tilt adjustment is performed using an adjustment jig as shown in FIG. Further, the tangential tilt adjustment is performed to perform the tilt adjustment.

FIG. 7 shows an example in which an autocollimator 31 is used as the parallelism detecting means. Here, an adjustment reference base 3 on which a chassis 3 on which a spindle motor 1, an optical pickup 2, and first and second guide shafts 7 and 8 are mounted is mounted.
2 and the triangular mirror 33 are used together. Adjustment base 32
Are provided with reference projections 34a, 34b, and 34c for mounting the chassis 3 in three places, and the chassis 3 is fitted with the reference projections 34a and 34b so as to prevent positioning and misalignment. Holes 35a and 35b are formed. The autocollimator 31 has reference projections 34a, 34
b, 34c (therefore, the parallelism is detected with reference to the chassis 3). Adjustment bits 27a, 27b, and 27c that can be locked in recesses of set screws 26a, 26b, and 26c of the first, second, and third support mechanisms 22, 28, and 29 are embedded in the adjustment reference table 32. The set screws 26a, 26b, 26c can be moved up and down independently by turning the external adjustment knobs 36a, 36b, 36c. Therefore, the adjustment knob 36
a, 36b, and 36c function as parallel driving means.

Next, the procedure for adjusting the parallelism of the first and second guide shafts 7 and 8 to the surface of the chassis 3 will be described.
First, as shown in FIG. 8A, the triangular mirror 33 is placed at the outer peripheral side of the first and second guide shafts 7 and 8 so that the first guide shaft 7 side is used as a reference (the bottom side of the triangle). The adjustment knob 36a is operated while detecting the state of the reflected light from the triangular mirror 33 through the cross-shaped reticle of the autocollimator 31, and the first support mechanism 22 is operated.
The radial position of one end of the first guide shaft 7 is adjusted by adjusting the height position of the set screw 26a in the above, that is, the first guide shaft 7 is adjusted to be in a horizontal state. further,
By operating the adjustment knob 36b to adjust the height position of the set screw 26b in the second support mechanism 28, the tangential adjustment of one end of the second guide shaft 8, ie, the second
Is adjusted so that one end of the guide shaft 8 is at the same height as the first guide shaft 7. After such adjustment, this time, FIG.
As shown in (b), the triangular mirror 33 is positioned on the outer peripheral side of the first and second guide shafts 7 and 8 so that the second guide shaft 8 is used as a reference (to be on the base side of the triangle). )put,
By operating the adjustment knob 36c to adjust the height position of the set screw 26c in the third support mechanism 29 while detecting the state of the reflected light from the triangular mirror 33 through the crosshair reticle of the autocollimator 31. Radial adjustment of the other end of the second guide shaft 8, that is, the second guide shaft 8
Adjust so that is horizontal. By such an adjustment, the first and second guide shafts 7 and 8 are adjusted to be in a state parallel to the surface of the chassis 3 so that there is no twist or the like.

FIG. 9 is an exploded perspective view showing a tilt adjusting jig 41 used after the parallelism adjustment. The adjustment jig 41 has reference protrusions 42a, 4
A jig table 4 having a monitor fixture 43 having 2b and 42c and capable of extracting a signal from a light receiving element of a detection optical system at a position corresponding to the optical pickup 2.
4 and a jig circuit 45 connected to the fixture 43 of the jig base 44. The output of the jig circuit 45 is connected to a jitter meter (not shown). The jig table 44 has first, second, and third support mechanisms 22, 28, 2
9, stepping motors 46a, 46b, 46c each having an adjustment bit 27a, 27b, 27c at the tip thereof which can be locked in the recesses of the set screws 26a, 26b, 26c are attached.
The set screws 26a, 26b, 26 are driven by the rotation drive of 46c.
c can be moved up and down independently of each other. These stepping motors 46a, 46b, 46
c is each driver 4 under the control of the control circuit 47.
8a, 48b, and 48c.

Here, the procedure of the tilt adjustment after the parallelism adjustment will be described. In this tilt adjustment, the chassis 3 having the first and second guide shafts 7, 8, etc., whose parallelism has been adjusted, is mounted on the jig base 44, and the DVD-standard optical disk 49 is mounted on the turntable 6. The rotation is performed by the spindle motor 1 and the optical pickup 2 is operated. At this time, the optical pickup 2 is controlled so as to be located, for example, near the middle position in the disk radial direction.

First, the optical disk 49 being driven to rotate is
The laser beam is condensed and emitted by the objective lens 9 of the optical pickup 2 and the reflected light is received and detected by the light receiving element of the detection optical system.
The signal is taken into the jig circuit 45 through the controller and output to the jitter meter so that the jitter is minimized.
7. The radial tilt is adjusted by simultaneously driving the stepping motors 46a and 46b by the same amount (the same number of steps) through the drivers 48a and 48b, and by rotating the set screws 26a and 26b by the same amount. That is, the parallelism in the height direction of the first and second guide shafts 7 and 8 is adjusted, and the tangential tilt does not change depending on the position in the radial direction. The first and the second to minimize the jitter on the monitor
By simultaneously adjusting the radial tilt by the second support mechanisms 22 and 28, the adjustment can be performed properly in a short time. For example, a quadratic curve regarding jitter is obtained by the least square method,
The axis position of the quadratic curve including the minimum point at which the jitter is minimized is determined, and the stepping motor 46a,
What is necessary is just to control the number of drive steps of 46b. At this time,
Set screws 26a, 26b are connected to stepping motors 46a,
Since only the same amount of driving is required at the same time through 46b, the control is simple (the same number of steps is required) and the parallelism between the first and second guide shafts 7, 8 can be maintained.

After such adjustment of the radial tilt, similarly, the laser beam is condensed and irradiated on the optical disk 49 being driven by the objective lens 9 of the optical pickup 2, and the reflected light is received by the detection optical system. The light is detected by the element, and the detection output is taken into the jig circuit 45 via the fixture 43 and output to the jitter meter,
The stepping motors 46b and 4 are controlled through the control circuit 47 and the drivers 48b and 48c to minimize the jitter.
The tangential tilt is adjusted by simultaneously driving the 6c by the same amount (the same number of steps) and by rotating the set screws 26b and 26c by the same amount.
That is, since the parallelism of the first and second guide shafts 7 and 8 is adjusted and maintained, the tangential tilt does not change depending on the position in the radial direction.
By simultaneously adjusting the tangential tilt by the second and third support mechanisms 28 and 29 so that the jitter is minimized on the point monitor, the adjustment can be performed properly in a short time.

Further, in the already-proposed example, the autocollimator is used as the parallelism detecting means. In addition, for example, the first and second displacement sensors such as a dial gauge, a laser displacement meter, and a contact potentiometer are used. It is mentioned that the parallelism of the guide shafts 7 and 8 may be adjusted. That is, four displacement sensors are disposed on the first and second guide shafts 7, 8 corresponding to the respective support mechanisms 21, 22, 28, 29, and the heights of four points detected by these displacement sensors are provided. The first, second, and third support mechanisms 2 so that
The height positions of the set screws 26a, 26b, 26c of the 2, 28, 29 may be individually adjusted.

However, in the proposed method, when a non-contact type displacement meter such as an autocollimator 31 is used as the parallelism detecting means for measuring and adjusting the parallelism, the adjusting device is expensive. Become. On the other hand, when using a contact displacement meter such as a contact potentiometer,
Although the adjusting device is inexpensive, the chassis 3 is distorted via the guide shaft (first or second guide shaft 7 or 8) with which the contact type displacement meter is in contact, and accurate measurement cannot be performed. However, there is a problem that the accuracy after the parallelism adjustment cannot be maintained. In particular, since the chassis 3 is formed with the large opening 12 for moving the optical pickup 2 and the like, the chassis 3 is likely to be distorted by receiving a contact in the surface direction.

Accordingly, the present invention provides a guide shaft parallelism measurement / adjustment device which is less likely to cause distortion in the chassis even when an inexpensive contact type parallelism detecting means is used, and which can properly detect and maintain the parallelism. With the goal.

[0025]

According to the first aspect of the present invention,
Equipment provided with first and second parallel spaced guide shafts movably supporting an object to be moved along a chassis surface and movably supported by a support portion in a direction perpendicular to the chassis surface. , Contact-type parallelism detecting means for detecting the parallelism of the first and second guide shafts with respect to the chassis surface, and the first and second guide shafts according to the detection output of the parallelism detection means And a distortion correcting means for correcting distortion of the chassis at the time of detection by the parallelism detecting means.

Therefore, when the parallelism is detected by the contact type parallelism detecting means, the chassis may be distorted by receiving a force in a direction perpendicular to the chassis surface, and the chassis is provided with a distortion correcting means capable of correcting the distortion. Therefore, the distortion of the chassis can be avoided, so that the parallelism can be accurately detected without the distortion of the chassis, and the accuracy of the parallelism after the detection and adjustment can be maintained.

According to a second aspect of the present invention, in the guide axis parallelism measuring / adjusting apparatus according to the first aspect, the distortion correcting means is provided on a side opposite to a position where the contact type parallelism detecting means contacts the guide shaft. And an elastic member disposed at

Therefore, the elastic member is used as the distortion correcting means, and the elastic member is provided at a position opposite to the position at which the contact type parallelism detecting means contacts the guide shaft. In the end, the invention according to claim 1 can be easily realized with a small size.

According to a third aspect of the present invention, the first and second parallel guide shafts for movably supporting an object to be moved are arranged along the chassis surface so as to be perpendicular to the chassis surface by the support portion. A contact-type parallelism detecting means for detecting the parallelism of the first and second guide shafts with respect to the chassis surface, and a detection output of the parallelism detecting means. A driving means for driving the support portions of the first and second guide shafts independently of each other, and a chassis having a relatively high surface accuracy when detected by the parallelism detecting means. And a holding mechanism for holding the posture.

Therefore, when the parallelism is detected by the contact type parallelism detecting means, the chassis may be distorted by receiving a force in a direction perpendicular to the chassis surface. Since the holding mechanism for holding the posture of the chassis on both side surfaces is provided, the parallelism can be detected and adjusted without being affected by the accuracy of the chassis surface.

According to a fourth aspect of the present invention, in the guide axis parallelism measuring and adjusting apparatus according to the first, second or third aspect, the object to be moved is an optical pickup, and the first and second guide axes are the optical pickup. This axis supports the pickup so as to be movable in the radial direction of the optical disk.

Therefore, by applying the guide shaft parallelism measuring and adjusting device according to claim 1, 2, or 3 to an optical disk device using a DVD or the like, precise positional accuracy of the first and second guide shafts is ensured. And can work well.

[0033]

FIG. 1 shows a first embodiment of the present invention.
It will be described based on. The same parts as those of the already proposed example shown in FIGS. 4 to 9 are denoted by the same reference numerals, and description thereof is omitted (the same applies to the following embodiments). In the present embodiment, the optical pickup 2 is a moving object. In the present embodiment, as the parallelism detecting means, contact-type displacement meters 51, 52, 53, and 54 are used as shown in FIG. 1 instead of the non-contact type autocollimator 31 shown in FIG. Based on These displacement meters 51, 52,
53 and 54 are measurement points 55a, 55b, 55c and 5 set near the support on the first and second guide shafts 7 and 8, respectively.
5d, it is arranged to be able to contact the first and second guide shafts 7, 8 from above. Here, the displacement meter 51 is used as a reference. Furthermore, the guide shaft on one side supported by the reference projection 42c, for example, the lower surface side of the measurement point 55b on the support mechanism 22 side of the first guide shaft 7 (measurement point 55b
An elastic member 56 as a distortion correcting means is provided at a position corresponding to (the opposite side to) the displacement meter 54. As the elastic member 56, specifically, a fixture pin is used, but rubber, a leaf spring, an air damper, an oil damper, or the like may be used instead. Other mechanisms (adjustment knobs 36a, 36b, 36
c) is substantially the same as the proposed example.

In such a configuration, in order to adjust the parallelism of the first and second guide shafts 7 and 8 to the surface of the chassis 3 (the surface of the optical disk), first, the height of the first measurement point 55a is displaced. After measuring by the total 51, the other three measurement points 5
Each of the displacement meters 5 is set so that the heights of 5b, 55c, and 55d coincide with the height of the reference point (the height of the first measurement point 55a).
The adjustment is performed by adjusting the corresponding adjustment knobs 36a, 36b, and 36c while measuring by the numbers 2, 53, and 54.

At this time, as in the present embodiment, contact type displacement meters 51, 52, 53, 54 are used as parallelism detecting means.
Is used, the load of the contact type displacement meter 52 is applied to the chassis 3 via the first guide shaft 7 at the one-point support portion of the adjustment reference base 32 by the reference projection 34c,
The surface accuracy of the chassis 3 is distorted. Due to this distortion, the position of the measurement point 55b changes with respect to the height of the measurement point 55a (reference point height), and the parallelism cannot be maintained after the adjustment.

Here, in the present embodiment, an elastic member 56 is disposed on the opposite side of the contact point (measurement point 55b) of the contact type displacement meter 52, and the first member is disposed on the opposite side of this contact point. Contact type displacement meter 5 for receiving the portion corresponding to the guide shaft 7
2, the distortion of the chassis 3 generated based on the load can be corrected. As a result, the parallelism can be measured normally, and the measurement points 55a, 55b, 55c, and 55d can be accurately measured. Therefore, the parallelism can be accurately adjusted, and the parallelism can be adjusted. Later position accuracy can be maintained.

When the reference projections 42a and 42b and the reference projection 42c are interchanged and the support mechanisms 21 and 29 are supported at one point, the measurement corresponds to the measurement point 55a that is contacted by the contact type displacement meter 51. The elastic member 56 may be provided at the position.

A second embodiment of the present invention will be described with reference to FIG. In the above-described embodiment, the attitude of the chassis 3 may change due to the variation in the surface accuracy of the chassis 3. Therefore, the first and second guide shafts 7, 8
When the parallelism is detected and adjusted, a slight variation may occur.

From the above, in the present embodiment,
As shown in FIG. 2, after the chassis 3 is held by the reference projections 34a, 34b, 34c of the adjustment reference base 32, the chassis 3
In this embodiment, portions having relatively high rigidity (surface accuracy) (in the present embodiment, the side surfaces 3s on both sides of the chassis 3) are movable in the left-right direction and are held by being clamped by clamps 61 and 62 as a holding mechanism. It was made. 6
1a and 62a are elastic members for preventing the chassis 3 from being damaged during clamping. Thus, the chassis 3
By detecting and adjusting the degree of parallelism while holding the side surfaces 3s on both sides of the chassis 3 by the clamps 61 and 62, the posture of the chassis 3 is kept constant, and the contact type displacement meter 51,
The load due to 52, 53, 54 can be offset.

Therefore, according to the present embodiment, the measurement points 55a, 55b, 55c,
55d parallelism can be measured accurately, and
It is also possible to maintain the parallelism after the adjustment. When the clamps 61 and 62 are firmly clamped, the elastic member 56 is not necessarily required.

In the present embodiment, the clamps 61, 6 each having a length (width) covering almost the entire length of the side surface 3s of the chassis 3 are provided.
3, the clamps 61, 62 having a length (width) of holding only the side surface 3s portion supported by the reference projection 34c at one point may be used as shown in FIG. According to this, since the clamps 61 and 62 themselves can be made smaller, the device itself can be made smaller.

[0042]

According to the first aspect of the present invention, when the parallelism is detected by the contact type parallelism detecting means, the chassis may be distorted by receiving a force in a direction perpendicular to the chassis surface. Is provided, the distortion can be avoided, so that the distortion of the chassis can be avoided. Therefore, the parallelism can be accurately detected without the distortion of the chassis, and the accuracy of the parallelism after the detection and the adjustment. Can be maintained.

According to the second aspect of the present invention, in the guide shaft parallelism measuring and adjusting device according to the first aspect, an elastic member is used as the distortion correcting means, and the contact member of the guide member is a contact type parallelism detecting means. Since it is provided at a position opposite to the position where it comes into contact with, the distortion generated in the chassis can be easily canceled, and as a result, the invention according to claim 1 can be easily realized with a small size.

According to the third aspect of the present invention, when the parallelism is detected by the contact-type parallelism detecting means, the chassis may be distorted by receiving a force in a direction perpendicular to the chassis surface. Is provided with a holding mechanism that holds the attitude of the chassis at relatively high positions, for example, on both side surfaces, so that the parallelism can be detected and adjusted without being affected by the accuracy of the chassis surface.

According to the fourth aspect of the present invention,
By applying the guide axis parallelism measurement adjustment device described in 2 or 3 to an optical disk device using a DVD or the like,
The second guide shaft can be operated satisfactorily while ensuring precise positional accuracy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a second embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a modified example thereof.

FIG. 4 is an exploded perspective view showing the contents of an already proposed example.

FIG. 5 is a plan view thereof.

FIG. 6 is a cross-sectional view showing a partial structure of a support mechanism.

FIG. 7 is an exploded perspective view showing a parallelism adjusting mechanism.

FIG. 8 is a schematic plan view showing the adjustment procedure.

FIG. 9 is an exploded perspective view showing a tilt adjustment mechanism.

[Explanation of symbols]

 Reference Signs List 2 optical pickup, object to be moved 3 chassis 7 first guide shaft 8 second guide shaft 36a to 36c parallel driving means 49 optical disk 51 to 54 parallelism detecting means 56 elastic member, distortion correcting means 61, 62 holding mechanism

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Takahashi F-term (reference) 2F065 AA45 CC00 DD02 EE00 FF67 PP11 5D117 AA02 GG03 JJ13 KK08 1-9-11 Kamatahonmachi, Ota-ku, Tokyo

Claims (4)

[Claims] 1. A first and a second guide shaft, which are parallel and spaced apart from each other and movably support a moving body, are movably supported by a supporting portion along a chassis surface in a direction perpendicular to the chassis surface. A contact-type parallelism detecting means for detecting the parallelism of the first and second guide shafts with respect to the chassis surface; and the first and second guide shafts according to a detection output of the parallelism detecting means. Second
Parallel driving means for independently driving the support portions of the guide shafts, and distortion correcting means for correcting distortion of the chassis when detected by the parallelism detecting means. Degree measurement adjustment device. 2. The guide according to claim 1, wherein said distortion correcting means comprises an elastic member disposed on a side opposite to a position where said contact type parallelism detecting means contacts said guide shaft. Axis parallelism measurement adjustment device. 3. A parallel movement of the first and second guide shafts, which are movably supported on a moving body, along a chassis surface, and are movably supported by a support portion in a direction perpendicular to the chassis surface. A contact-type parallelism detecting means for detecting the parallelism of the first and second guide shafts with respect to the chassis surface; and the first and second guide shafts according to a detection output of the parallelism detecting means. Second
A driving mechanism for parallel driving the support portions of the guide shafts independently of each other, and a holding mechanism for holding the attitude of the chassis in a portion where the surface accuracy of the chassis is relatively high when detected by the parallelism detecting means. , A guide shaft parallelism measurement adjustment device. 4. The optical pickup according to claim 1, wherein the first and second guide shafts are shafts for movably supporting the optical pickup in a radial direction of the optical disk. The guide shaft parallelism measurement adjustment device according to 2 or 3.