JPH0544093B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head mounting device for accurately mounting a magnetic head to a head support.

[Prior art] As a conventional magnetic head mounting device of this type,
There is one described in JP-A-59-63025. The magnetic head mounting device described in this publication is provided with a holder on the top surface of the base to which the head support is detachably attached, and an optical observation device with an optical axis extending horizontally toward the head support. In addition, a holding mechanism for holding a magnetic head placed on a head supporter is provided so as to be able to be finely adjusted. When attaching a magnetic head to a head support using such a magnetic head attachment device, the magnetic head placed on the head support is held by a holding mechanism, and the magnetic head is also held by an optical observation device. While observing the position and posture of the magnetic head, finely adjust the position of the magnetic head using the holding mechanism. Then, when the magnetic head is located at a predetermined position, the magnetic head is fixed to the head support with bolts or the like.

Incidentally, when attaching a magnetic head to a head support, an important point is that the amount of protrusion of the magnetic head relative to the head support must be accurately regulated. Therefore, the conventional magnetic head mounting device described above utilizes the generation of interference fringes due to light interference. That is, the light emitted from one light source is divided into reflected light that is reflected by the magnetic head and goes toward the optical observation device, and direct light that goes directly (sometimes reflected by a mirror or the like) toward the optical observation device. Then, the magnetic head is moved in the optical axis direction of the optical observation device while being irradiated with light. When the magnetic head reaches a predetermined position, that is, when the amount of protrusion of the magnetic head relative to the head support reaches a desired amount, interference fringes are generated based on the difference in optical path length between the reflected light and the direct light. The interference fringes are confirmed using an optical observation device, and the amount of protrusion of the magnetic head relative to the head support is thereby accurately regulated.

[Problems to be Solved by the Invention] In the magnetic head mounting device described above, when the temperature in the room in which the magnetic head mounting device is installed changes, the base and the lens barrel of the optical observation device expand and contract in response to the change. This expansion and contraction changes the distance between the optical observation device and the head support. With this change, the position where the interference fringes appear changes from the normal position. For this reason, even if interference fringes were confirmed using an observation device, there was a problem in that an error occurred in the mounting position of the magnetic head. Furthermore, if a mounting error occurs in the optical axis direction when attaching the head support to the holder, there will be a misalignment between the head support and the magnetic head even if the magnetic head is positioned at the correct position. Therefore, there was a problem in that the mounting error became even larger.

The present invention provides a magnetic head mounting device that allows the magnetic head to be mounted with an accurate protrusion amount relative to the head support even if the base or the like expands or contracts or there is a mounting error in the head support. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention is provided with a distance sensor that detects the distance between the optical observation device and the head support.

[Operation] After the head support is attached to the support, the distance between the optical observation position and the head support is measured by the distance sensor. If the measured distance differs from the set distance, the optical observation device is moved in the direction of its optical axis by the difference to adjust the distance. Thereafter, the position of the magnetic head is observed using an optical observation device, and when the magnetic head is at a predetermined position, the magnetic head is fixed to the head support.

[Example] Hereinafter, an example of the present invention will be described in attached No. 1.
This will be explained with reference to FIGS. 6 through 6. In addition, the first
The figure is a plan view of the magnetic head mounting device according to this invention, and FIG. 2 is a partially cutaway front view.

The magnetic head mounting device of this embodiment includes a holding part 2 and a magnetic head B, each of which is provided on the upper surface of a base 1 and to which a head support A is removably attached.
A holding mechanism 3 for holding and finely adjusting the position and attitude of the magnetic head B, a first optical observation device 4 for observing the position and attitude of the magnetic head B, and a second observation device 5 used auxiliary. There is.

First, the holding part 2 will be described. A cylindrical bearing member 21 is erected and fixed at the center of the upper surface of the base 1 with its axis directed in the vertical direction.
A support body 22 is rotatably provided above the bearing member 21 via a thrust bearing 23 and radial bearings 24 and 25. A circular protrusion 22a is formed at the center of the upper surface of the support 22, and a threaded portion 22 is formed at the center of the upper end of the protrusion 22a.
2b is provided. The cylinder (head support) A is fitted into the protruding portion 22a and is fixed by a pressing member 26 screwed into the threaded portion 22b. A magnetic head B is fixed by a screw C at a position 180 degrees apart in the circumferential direction on the upper surface of the cylinder A. The lower end of the support 22 extends downward through the bearing member 21 and the base 1, and the rotation angle of the support 22 and the motor M for rotating the support 22 are detected at the lower end. A rotary encoder RE is installed for

Further, regarding the holding mechanism 3, adjustment screws 31a and 31 are provided on the upper surface of the base 1 adjacent to the bearing member 21.
An X-Y stage 31 is provided on which the mounting portion 31c is moved in the XX direction and the Y-Y direction in FIG. This X-Y stage 3
A support 32 is erected on the upper surface of the first mounting portion 31c. On the side of this support 32 on the bearing member 21 side, there is a magnetic head B attached to the cylinder A.
An auxiliary column 33 is mounted so as to be rotatable about a center line L that is located substantially in contact with the center of the front end surface of the bearing member 21 and is parallel to the axis of the bearing member 21 .
That is, as shown in FIG. 3, on each surface of the support column 32 and the auxiliary support column 33 that face each other in the vertical direction, there are arcuate track plates 34 centered on the center line L,
34 are fixed respectively, and these track plates 3
A steel ball 35 is disposed between 4 and 34. This allows the auxiliary support 33 to rotate freely around the support 32.
and is supported in a radial direction so as not to be detachable. Also,
A worm gear 33a centered on the center line L is formed on the surface of the auxiliary column 33 facing the column 32, and a worm 36 that meshes with the worm gear 33a is connected to the column 32.
It is provided so that it can rotate freely and cannot move in the axial direction. This worm gear 36 is connected to the handle 36.
By rotating by a, the auxiliary support 33
is starting to rotate. In addition, auxiliary support 3
The base end of the mounting plate 37 is fixed to the upper end of the side surface facing the bearing member 21 of No. 3. A cutout 37a is formed in the center of the distal end surface of the mounting plate 37, and one side of the bearing member 21 fits into the cutout 37a.

Further, a magnetic head B is provided at the tip of the mounting plate 37.
A gripping mechanism 38 is provided for gripping. That is, support stands 380, 380 are provided at the distal end of the mounting plate 37, respectively, to sandwich the notch 37a. As shown in FIG. 4, one support base 380 is rotatably provided with a base end of a support rod 381, and the other support base 38
0 has a groove 38 into which the tip of the support rod 381 enters.
2 is formed, and a stopper 383 located at the bottom of the groove 382 is provided. When the tip of the support rod 382 hits the stopper 383, the support rod 381 becomes horizontal.

A pair of moving pieces 38 are provided on one side of the support rod 381.
4,384 are provided so as to be movable in the longitudinal direction of the support rod 381. The movable pieces 384, 384 are biased toward each other by springs 385, 385, respectively, while being moved apart by a cam 386. Also,
Each moving piece 384, 384 has a gripping claw 3.
87,387 is attached. At the portion of one gripping claw 387 facing the other gripping claw 387,
As shown in FIG. 5, a reference surface 388 consisting of two orthogonal surfaces corresponding to the magnetic head B is formed, while a magnetic head B is pressed against the reference surface 388 on the opposing portion of the other gripping claw. The pressing surface to hit is 389
is formed. Note that when the gripping claw 387 on which the reference surface 388 is formed is moved toward by the spring 385, it hits the reference member 390 and stops at a position just before contacting the magnetic head B placed on the cylinder A. It's like that. Further, the spring 385 that presses the gripping claw 387 is set to have a larger biasing force than the other spring.

In order to hold the magnetic head B placed on the cylinder A by the gripping mechanism 38 having such a configuration,
The gripping claws 387, 387 are moved apart in advance by the cam 386, and the support rod 381 is placed in a horizontal state. Then, the magnetic head B will be located between the gripping claws 387, 387. Therefore, gripping claw 3
When 87, 387 is moved closer, one of the gripping claws 387 hits the reference member 390 and stops.
The other gripping claw 387 presses the magnetic head B against the one gripping claw 387, thereby gripping it. Here, since the biasing force of the spring 385 that presses one gripping claw 387 is larger than that of the other screw 385, one gripping claw 387 presses against the reference member 390.
This will result in maintaining a state in which it has hit.

The first optical observation device 4 also includes an imaging device 42 supported movably in the XX direction and the YY direction in FIG. 1 by an XY stage 41. The position of the imaging device 42 is adjusted by the X-Y stage 41 so that its optical axis is perpendicular to the axis of the bearing member 21 and passes through the center of the distal end surface of the magnetic head B that is correctly attached to the cylinder A. has been done. In the imaging device 42 adjusted in this way, when light having a continuous spectrum is sent from a light source (not shown) through the optical fiber 43,
The light is divided into transmitted light and reflected light by the prism set 44. The transmitted light is reflected by the mirror 45 and reaches the prism assembly 44 again, where it is reflected and reaches the imaging tube 47 via a lens group (not shown) and a reflecting mirror 46. On the other hand, the reflected light hits the tip of the magnetic head B held by the holding mechanism 3 and is reflected, reaching the prism assembly 44 . The light then passes through the prism assembly 44, passes through the reflecting mirror 46, and reaches the image pickup tube 47. In this way,
The image pickup tube 47 captures an enlarged image of the tip of the magnetic head B, and if the position of the support head B in the optical axis direction is a normal position, interference due to the difference in optical path length between the transmitted light and the reflected light is detected. It also captures the stripes. Then, the imaging signal from the imaging tube 47 is transmitted to the sixth
Screen display device (e.g. CRT display) 4 shown in the figure
Sent to 8th.

Furthermore, a distance sensor 6 is installed at a location closest to the cylinder A on the front surface of the imaging device 42 facing the cylinder A. This distance sensor 6 is
It uses a magnetic resistance element, etc., and outputs a voltage corresponding to the change in distance between it and cylinder A. When the output reaches a set value, a confirmation lamp (not shown) or other confirmation means displays this. It can be seen that the distance between the cylinder A and the imaging device 42 is the normal distance. In addition,
As the distance sensor 6, in addition to a magnetoresistive element, a capacitive type, an eddy current type, or the like may be used.

Next, the second optical observation device 5 will be explained. The second optical observation device 5 is used as an auxiliary to the rotary encoder RE, and the holder 22 detected by the rotary encoder RE
It is confirmed whether the amount of rotation is correct by observing the magnetic head B moved by the rotation of the holder 22. That is, the second optical observation device 5 uses the X-Y stage 51 to
It is equipped with an imaging device 52 supported movably in the X-X direction and the Y-Y direction in the figure, and the imaging device 5
2 is fixed in position with its optical axis aligned with the optical axis of the imaging device 42. In the imaging device 52 installed in this manner, the light from the light source device 53 is reflected by the half mirror 54, and the rotation of the holder 22 causes the light to be directed to the magnetic head B located in front of the imaging device 52.
After being reflected there, it passes through a half mirror 54 and is further reflected by a mirror 55 to reach an imaging tube 56. In this way, the image pickup tube 56 captures an enlarged image of the tip of the magnetic head B, and sends the image signal to the screen display 57 shown in FIG.

A case will be described in which a magnetic head B is attached to a cylinder A using the magnetic head attaching device having the above structure.

First, the positions of the imaging devices 42 and 52 are adjusted in advance so that their respective optical axes coincide with each other.

Next, cylinder A is set on holder 12.
After the holder 12 is set, the distance sensor 6 is used to check whether the distance from the cylinder A to the imaging device 42 is correct. If the distance is incorrect, the imaging device 42 is moved appropriately in the direction of its optical axis to adjust.

Next, the magnetic head B is placed on the cylinder A and lightly temporarily secured with screws C. At this time, screw C
There is a slight gap between the mounting hole (not shown) of the magnetic head B and the mounting hole (not shown) penetrated by the mounting hole. Therefore, the position of the magnetic head B is adjustable. While holding the temporarily fixed magnetic head B by the holding device 3, the position and posture of the holding device 3 are adjusted by the XY stage 31 and the mounting plate 37. It can be confirmed from the image on the screen display 48 whether the magnetic head B is located at the correct position. That is, if the amount of protrusion of magnetic head B with respect to cylinder A is a specified amount of protrusion, interference fringes will appear. In addition, since the image D of the gap (not shown) formed on the distal end surface of the magnetic head B intersects the vertical cursor line 48a at its center, the magnetic head B is moved in the horizontal direction perpendicular to the optical axis of the imaging device 42. It can be seen that it is located at the normal position. Furthermore, at this time, if the attitude (orientation) of the magnetic head B is correct, interference fringes appear concentrically about the intersection of the image D and the vertical cursor line 48a.

Once the magnetic head B is in the correct position, it is fixed to the cylinder A with screws C. At this time,
The screw C is tightened by adjusting the tightening force of the screw C so that the image D intersects the horizontal cursor line 48b at its center. Furthermore, after fixing the magnetic head B,
The holding by the holding device 3 is released.

After that, the holding body 12 is rotated 180°. This amount of rotation is accurately measured by the rotary encoder RE. Furthermore, if the gap is rotated by 180°, the image E of the gap displayed on the screen display 57 intersects the vertical cursor line 57a at its center. [Effects of the Invention] As explained above, the magnetic head mounting device of the present invention According to , a distance sensor that detects the distance between the optical observation device and the head support is installed in the part facing the head support, so the base etc. may expand or contract due to temperature changes. Or, even if there is an error in the mounting position of the head support, the distance between the optical observation device and the cylinder can be set to the specified distance by measuring the distance between it and the cylinder using a distance sensor. The position of the optical observation device can be adjusted in a manner similar to that of the present invention, which has the effect that errors in mounting the magnetic head to the head support can be minimized.

[Brief explanation of drawings]

Figures 1 to 7 show one embodiment of the present invention; Figure 1 is a plan view thereof, Figure 2 is a partially cutaway front view thereof, and Figure 3 is a rotation of the support column and the auxiliary support column. FIG. 4 is an enlarged cross-sectional view showing the support mechanism, FIG. 4 is an enlarged view taken in the direction of the arrow in FIG. 2 showing the gripping mechanism, FIG. 5 is an enlarged view taken in the direction of the arrow in FIG. FIG. 7 is a front view showing the screen display of the second optical observation device. A... Cylinder (head support), B... Magnetic head, 1... Base, 2... Support section, 3... Holding mechanism, 4... First optical observation device (optical observation device), 6 ...Distance sensor.

Claims (1)

[Scope of Claims] 1. A base, (a) a holding part to which a head support to which a magnetic head is attached is removably attached, and (b) a head support attached to the holding part in the direction in which the optical axis extends. an optical observation device that is movable toward the body side and in the direction in which the optical axis extends; and (c) a magnetic head that is movable in the optical axis direction of the optical observation device and that is to be attached to the head support. What is claimed is: 1. A magnetic head mounting device comprising: a holding mechanism for holding a magnetic head; further comprising: a distance sensor for detecting a distance between the optical observation device and the head support;