JPS63228409A - Magnetic head assembly holding mechanism - Google Patents

Abstract

PURPOSE:To simply hold a magnetic head assembly without damaging it by positioning the magnetic head assembly with a positioning mechanism beforehand and inserting a pin into a fitting hole in the positioned condition. CONSTITUTION:A positioned head substrate 5 is further positioned and locked by a head chuck mechanism 20 to elevate which is arranged to the upper part of a video head fixing stand 4. Namely, when the head chuck mechanism 20 falls by the operation of the elevating mechanism, an edge conical inserting pin 23 fitted at the bottom part of the head chuck mechanism 20 is fitted into a cylinder fitting hole 5e provided to fit the video head to a cylinder and locked to the video head fixing stand 4. Thus, the magnetic head can be positioned and held correctly without damaging it.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head assembly and holding mechanism, and more specifically, to a video head inspection device that measures the peak output characteristics of a video head without damaging the video head. This invention relates to an improvement in a video head assembly holding mechanism that allows accurate holding.

[Prior Art] A video recording/reproducing device usually incorporates a plurality of heads, and these plurality of video heads are required to have the same characteristics.

Therefore, in order to match the characteristics of the video head,
In order to improve the yield of video head sets (bearings), it is essential to measure the output characteristics of video heads more accurately.

The inspection method for conventional video heads of this type is as follows:
As shown in the back view of the figure, the drum 2 on which the magnetic tape 1 is wound is placed approximately 1300 μm away from the video head fixing base 4 holding the video head assembly 3 to be inspected, and is about 1000 μm away. A measurement start point P is set at the moved point to start the determination of the output cuff of the magnetic head, and the drum 2 is moved to this measurement start point P at a relatively high speed. When the measurement start point P is reached, the output of the video head assembly 3 is measured, and after reaching the measurement start point P, the pitch is fed at a low speed, for example, 14
The drum 2 is fed at a pitch of about 1/2 pitch, and the magnetic head output of the video head assembly 3 is measured at each feed point versus window in accordance with this feeding timing. As a result, the peak value of the magnetic head output of the video head assembly 3 is measured.

Note that 6 is a magnetic head chip of the video head assembly 3, and 5 is a head substrate of the video head assembly 3. 7 is a lead wire to the measuring device; 8 is a rotating arm that positions the video head assembly (3) on the video head fixing base 4;
Further, reference numerals 9a*9b are positioning walls provided on the video head fixing base 4 and positioned at right angles to each other, forming a butting reference surface.

[Problem to be Solved] Here, the mounting accuracy of the magnetic tip 6 to the head substrate 5 has an error of ±30 μm. On the other hand, the measurement starting point P
Since the distance to the magnetic head chip 6 is fixed, the distance to the magnetic head chip 6 is fixed, and over-feeding or under-feeding to the magnetic head chip 6 occurs.

Therefore, it is necessary that the video head assembly 3 be accurately held on the video head fixing base 4.

In such a mechanism, since the rotating arm 8 alone is insufficient to hold the video head assembly 3 positioned on these reference planes in this position, a separate magnetic head chuck mechanism is provided for positioning. It is necessary to lock and fix the video head assembly 3. In this case, if the reference surface is used to hold the magnetic head between the reference surface, there is a drawback that the video head assembly 3 is damaged and the yield is reduced.

The present invention solves the problems of the prior art, and provides a magnetic head assembly holding mechanism that can accurately hold the magnetic head assembly in a predetermined position without damaging the magnetic head assembly. With the goal.

[Means for Solving the Problems] Means in the magnetic head assembly holding mechanism of the present invention for achieving the above object includes a substrate having a mounting hole for the device, a magnetic head chip attached to the substrate, and a magnetic head assembly having a magnetic head assembly, a stand on which the magnetic head assembly is placed, a positioning mechanism for positioning the magnetic head assembly at a predetermined position on the stand, and a magnetic head assembly positioned by the positioning mechanism. A magnetic head locking mechanism that is arranged at a predetermined distance from the three-dimensional object and moves forward and backward with respect to the magnetic head assembly, and the magnetic head locking mechanism has an insertion pin that fits into the mounting hole in the forward state. It is.

[Function] By positioning the magnetic head assembly in advance using the positioning mechanism and inserting the pin into the mounting hole in the aligned state, the magnetic head assembly can be easily held without damaging it.

Moreover, in this case, since the positioning is performed using the mounting hole, the position is accurate.

As a result, for example, in magnetic head inspection equipment, it is possible to position and hold the magnetic head more accurately and without damaging it, improving the reliability of peak value measurement and efficiently inspecting the magnetic head. be able to.

[Example] An example of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment in which the magnetic head assembly holding mechanism of the present invention is applied to a video head inspection system, FIG. 2 is an explanatory diagram of a specific example of the video head positioning mechanism, and FIG. is an enlarged detailed view of the piece. In addition,
Components equivalent to those in FIG. 4 are indicated by the same numerals.

In FIG. 2, reference numeral 10 denotes a video head assembly positioning mechanism, in which a magnetic head chip 6 protrudes from a first side 5a of a head substrate 5, which is a rectangular substrate, and a magnetic head assembly q body 3 is positioned. A positioning wall 9a is formed as a vertical wall in a position that does not interfere with the magnetic head chip 6 on a part of the negative side 5a, standing up from the video head fixing base 4. At a position perpendicular to this, when the magnetic head assembly 3 is positioned, a positioning wall 9b is similarly raised from the video head fixing base 4 so that it does not get in the way of one side 5b adjacent to the - side 5a. It is formed as a vertical wall.

Reference numeral 11 denotes a crank-shaped rotating arm, which is rotatably supported on the video head fixing base 4 via a shaft 17 located in front of the bending section. A swinging piece 12 is pivotally supported at one end of the swinging arm 11, and the swinging arm 11 is rotated with a frame passed between this end and the video head fixing base 4. It is biased by a spring 15 to rotate clockwise. The piston rod 16a of the cylinder 16 is located on the opposite side of the spring 15b and comes into contact with the rear end of the rotating arm 11 when it is extended as shown by the dotted line.
As a result, the rotating arm 11 is rotated counterclockwise from the state shown by the solid line to the position shown by the dotted line, where it is stopped.
:, let. The counterclockwise rotation in this case is performed against the action of the rotation biasing spring 15 which causes the rotation to rotate clockwise.

As seen in FIG. 3, the swinging piece 12 is pivotally attached to the positioning side tip of the head base plate 5 of the swinging arm 11 by a screw pin 13, and is supported so as to be swingable. Further, protrusions 12a and 12b are provided which protrude at right angles to each other, and C
The protrusions 12a and 12b are in contact with the sides 5C95d of the head substrate 5, respectively, in the positioning state shown by the solid line in FIG. The swinging piece 12 is
Normally, the other end of the spring 14 is fixed to the rotating arm 11, and the spring 14 is urged to rotate clockwise. A configuration is adopted in which the locking pin 12c itself is used as a stopper, and its rotation is prevented there. In addition, the spring 14 has the function of returning and maintaining its posture to the initial state as seen in FIG. Eggplant.

That is, by setting the relationship between the rotating arm 11 and the swinging piece 12 in the initial state as shown in FIG. 3, the protrusion 12a pushes the side 5d first, and then the protrusion 12b
presses the side 5C, giving priority to the contact of the protrusion 12a. Therefore, the head substrate 5 usually
The force of lateral movement acts first to position it on the positioning wall 9b side, and then it moves forward and is positioned on the positioning wall 9a. Note that the side 5C of the head substrate 5 is the side 5a.
The side 5d is the side opposite to the side 5b.

In the above configuration, the rotating arm 11 has the cylinder 16
As the piston rod 1θa moves forward and backward, its rotation is controlled by the relationship between the piston rod 1θa and the rotation biasing spring 15. in this case,
The shaft 17 may be rotated clockwise and counterclockwise by being directly rotated by a rotation mechanism such as a row reactor.

The dotted line in FIG. 2 shows the relationship between the swinging piece 12 and the rotating arm 11 before the video head 3 is positioned, but in the state shown by the solid line when the video head 3 is positioned, The piston rod lea of the cylinder 16 is retracted. And as shown by the dotted line, piston rod 1
6a expands, the rotating arm 11 rotates counterclockwise and returns to the initial state (standby state a) for receiving the head substrate 5. When the piston rod lea is retreated, the rotation arm 11 is rotated clockwise by the action of the rotation biasing spring 15, and the head base plate 5 is positioned at a predetermined position.

In this positioning, the protrusion 12a of the swinging piece 12 contacts the side 5d and the side 5b contacts the positioning wall 9b, and then the swinging piece 12 rotates counterclockwise and the protrusion 12a contacts the side 5d. This is because the side 5a is brought into contact with the positioning wall 9a. In this way, the head substrate 5 can be accurately positioned by one rotational movement of the upward rotational arm 11.

In this case, even if the side 5a comes into contact with the positioning wall 9a first, when the rotating arm 11 further rotates clockwise, the head substrate 5 is prevented from moving in the front-rear direction.
The moving piece 12 rotates clockwise. Therefore, the protrusion 12a moves forward in the lateral direction, pushes the head substrate 5 to the right and laterally, brings the side 5b into contact with the positioning wall 9b, and the head substrate 5 is accurately positioned by the rotational movement of the rotation arm 11. .

The head substrate 5 thus positioned is further positioned and locked by a head chuck mechanism 20 disposed above the video bed fixing base 4 and moving upward, as shown in FIG. That is, the head chuck mechanism 2
0 is lowered by the operation of its elevating mechanism (not shown), the insertion pin 23 with a conical tip attached to the bottom of the head chuck mechanism 20 moves into the cylinder mounting hole provided for attaching the video head to the cylinder. 5e and is locked to the video head fixing base 4. At this lowered position,
FIG. 1 shows a reduced state of 1-shield. As a result, the head chip 6 is accurately and reliably positioned and held at the predetermined measurement position. At this time, the head holding pin 25 is simultaneously brought into contact with the surface of the head substrate 5, and is pressed and fixed by the compressed spring 25a.

This presser pin 25 is parallel to the insertion pin 23 of the head chuck mechanism 20 and is connected to the column 2 of the head chuck mechanism 20.
The arm 22 protrudes forward from the arm 22 and is supported by a loose fit, and is normally biased downward by a spring 25a inserted in a compressed state. And the tsuba 25b provided at the top prevents the descent.
It is a stopper that blocks it within a certain range.

In this state, the characteristics of the magnetic head are measured according to the measurement system shown in FIG. When the measurement is completed, the head chuck mechanism 20 rises, but at this time, the guide pin 2B located on the opposite side to the holding pin 25 rotates and protrudes to the rear of the head board 5, and the end of the head board 5 is brought into contact with. As a result, the insertion pin 23 can be easily removed from the cylinder mounting hole 5e of the head substrate 5 as the head chuck mechanism 20 rises while the head substrate 5 is held down by the holding pin 25 due to the action of the spring 25a. When it is pulled out, the head substrate 5 will not be caught and lifted.

Here, once the two reference planes 9 positioning walls 9a.

After the head board 5 is positioned by contacting the head board 9b, the head board 5 is further positioned by the insertion pin 23 of the head chuck mechanism 20, since there is a risk of damaging the head board 5 if the head board 5 is locked while being positioned on the reference surface. Because there is. Therefore, in a state where the positioning is performed using the insertion pins 23, a minute gap exists between the positioning walls 9a+9b and the sides 5ae5b of the head substrate 5. This is because the tip of the insertion pin 23 is conical, and the centers of the cylinder attachment hole 5e and the insertion pin 23 are positioned with a slight deviation so as to create the gap.

Further, the reason why the video head assembly 3 is held down by the head holding pin 25 is that the center of gravity of the video head assembly 3 is shifted from the position of the cylinder mounting hole 5e.
This is to prevent the video head assembly 3 from being tilted and difficult to remove due to rotational moment acting on the video head assembly 3 when the insertion pin 23 is pulled out. Furthermore, the guide pin 26 maintains the cylinder mounting hole 5e and the insertion pin 23 in a perpendicular state, and prevents the relationship between them from becoming slanted or getting caught on the edges around the inside of the cylinder mounting hole 5e. It works to do something. Note that 26a is a pin for pivotally connecting the guide pin 26 to the support 21, and the video head fixing base 4 is provided with a hole 4a into which the presser pin 25 is fitted, corresponding to the position of the presser pin 25.

As explained above, the magnetic head positioning mechanism
It is not limited to what is shown in the figure.

Note that the shape of the swinging piece shown in FIGS. 2 and 3 can be various, and is not limited to this, and the shape of the head board is also limited to a rectangular shape that forms a perpendicular angle to each feed. Instead of a straight edge, it may be a diagonal side that slides and moves when the - side is pressed. The angle of the sides is also related to the pushing force and can be applied to quadrilaterals in general. In this case, a protruding portion for fixing the magnetic head and an uneven portion not used for positioning are ignored.

In the embodiment, the video head assembly is locked and fixed using an insertion pin and a holding pin, but since the video head assembly is already positioned, depending on the form of the magnetic head, only the insertion pin may be required. good.

Furthermore, although the embodiments mainly describe the positioning mechanism of a magnetic head assembly applied to a video head inspection method, the present invention is not limited to video heads.
Of course, it can be used for positioning magnetic heads, etc.

[Effects of the Invention] As can be understood from the above explanation, in this invention, the magnetic head assembly is aligned in advance by a positioning mechanism, and the pin is inserted into the mounting hole in the aligned state. , the magnetic head set can be held in ffF without damaging the body. Moreover, in this case, since the positioning is performed using the mounting hole, the position is accurate.

As a result, for example, in magnetic head inspection equipment, it is possible to position and hold the magnetic head more accurately and without damaging it, improving the reliability of peak value measurement and efficiently inspecting the magnetic head. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment in which the magnetic head assembly holding mechanism of the present invention is applied to a video head inspection system, FIG. 2 is an explanatory diagram of a specific example of the video head positioning mechanism, and FIG. 4 is an enlarged detailed view of the frame, and FIG. 4 is a schematic diagram of a general inspection system for measuring the characteristics of a video head. 3... 9 video head sets, 4... video head fixing stand, 5... head board, 6... magnetic head chip, 9 a + 9 b... positioning wall, 10... video Head assembly q body positioning mechanism, 11... Rotating arm, 12... Rocking piece, 12a, 12b... Protrusion, 13
...Screw pin, 15...Rotation biasing spring, 16...
Cylinder, 17... Axis, 20... Chuck mechanism, 2
1... Prop, 23... Insertion pin, 25... Holder pin, 26... Pin.

Claims (2)

[Claims] (1) A magnetic head assembly having a substrate having a mounting hole for the device, a magnetic head chip attached to this substrate, a stand on which this magnetic head assembly is placed, and a magnetic head assembly placed at a predetermined position on this stand. A positioning mechanism that positions the magnetic head assembly; and a magnetic head locking mechanism that is arranged at a predetermined distance from the magnetic head assembly positioned by the positioning mechanism and that moves forward and backward with respect to the magnetic head assembly. . A magnetic head assembly holding mechanism, wherein the magnetic head locking mechanism has an insertion pin that fits into the mounting hole in an advanced state. (2) the substrate is quadrilateral with a mounting hole for the device, the magnetic head chip is positioned on a first side of the quadrilateral substrate, and is attached so as to protrude from the first side;
The magnetic head locking mechanism is disposed above the magnetic head assembly positioned by the positioning mechanism, moves up and down with respect to the magnetic head assembly, and fits into the mounting hole in the lowered state. The magnetic head assembly according to claim 1, further comprising an insertion pin and a holding pin that is biased toward the magnetic head assembly in the lowered state and presses the surface of the magnetic head assembly. Retention mechanism.