JPS62200512A - Head block - Google Patents

Abstract

PURPOSE:To simplify the exchanging work of a magnetic head, by mounting the head in a state that a positioning is applied, and removing the head easily and safely with a screw bolt screwed in a screw hole. CONSTITUTION:A head block 40 on which a magnetic head 16 is positioned and fixed in advance, is positioned exactly at a head block placing plane 20 using a locator pin 34, and also, the block 40 is fixed using a magnet to facilitate a mounting. Meanwhile, when removing, the close contacts of magnets 36 and 44 are released by protruding the tip of an unloading screw 72 screwed in a screw hole, thereby, the block 40 is removed easily and safely. In this way, the exchanging work of the head 16 can be simplified.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a head block holding a magnetic head,
This is intended to simplify the work of replacing the magnetic head in a rotating magnetic sheet device.

<Prior Art> In an image recording system using an already standardized electronic still camera, a magnetic sheet pack containing a magnetic sheet is used as a recording medium. FIG. 8 is a plan view of this magnetic sheet pack, and FIG. 9 is a sectional view taken along line IX-IX in FIG. A magnetic sheet 12 on which still image information and the like are recorded is rotatably housed. A center core 1 as a reinforcing member is provided in the center of the magnetic sheet 12.
3 is provided, and this center core 13 has a magnetic sea!
・Exposed to the outside from the circular opening 14 of the pack 11,
When the magnetic sheet pack 11 is loaded into a rotating magnetic sheet device, this center core 13 is configured to be chucked onto a spindle motor rotating shaft 15. A window 17 in which a magnetic head 16 is located is opened in the magnetic sheet pack 11, and this window 17 for the magnetic head is opened and closed by a slideable shutter 18. That is, the shutter 18 closes the window 17 to prevent dust from adhering to the magnetic sheet 12 before the magnetic sheet pack 11 is loaded into the rotating magnetic sheet device. When the magnetic sheet 12 is loaded, the shutter 18 moves downward in FIG. 8 to open the head window 17, making it possible to record and reproduce information on the magnetic sheet 12. Therefore, this magnetism
1-12 at a high speed (3600 rpm), the magnetic head 16 is applied to the recording surface with a predetermined contact pressure (normally,
The magnetic sheet 12 is pushed up by 100 μm with a ladle), magnetic recording and magnetic reproduction are performed, and the magnetic sheet 12
For example, 52 magnetic tracks of radius 006 are formed with a pitch interval of 01.

Therefore, in order to be able to form such a magnetic track during recording and to accurately follow the magnetic track formed as described above during playback, the magnetic head 16 itself is also made of an extremely fine piece. are used, and high precision is required for positioning. Due to these circumstances, the magnetic head 16 used in electronic still cameras, etc. has a protrusion amount Ea with respect to the magnetic sheet 12 shown in FIG.
The tilt angle θC shown in FIG. 12, etc. must be within a predetermined tolerance range. In FIG. 10, reference numeral 19 denotes a regulating plate that is provided at a position facing the magnetic head 16 with the magnetic sheet 12 sandwiched therebetween, and allows the magnetic sheet 12 to align with the magnetic head 16.

Since it is necessary to move the head in the radial direction of the magnetic sheet 12 during recording and reproduction, conventionally the magnetic head 16 is held in a head block, and this head block is moved in the radial direction of the magnetic sheet 12. It is attached to the head carriage, which is driven in the direction, by fixing means such as screws.

<Problems to be Solved by the Invention> By the way, as described above, when the very fine magnetic head 16 is used in contact with the magnetic sheet 12 with a certain contact pressure, the magnetic head 16 may wear out. It will come. Then, g1 air head 1 against magnetic sheet 12
As a result, the contact pressure of No. 6 decreases, making it impossible to maintain proper recording and reproducing operations. If such a problem occurs, the magnetic head 16 will have to be replaced. For example, in a commercial magnetic recording device that extracts a video signal from a photographic image taken with a conventional photographic camera and writes it onto a magnetic sheet 12, a large amount of processing is performed, so the wear of the magnetic head 16 progresses. As a result, the number of times the magnetic head 16 must be replaced inevitably increases.

This work of replacing the magnetic head 16 is performed in advance by replacing the magnetic head 16.
This is done by replacing the head block that is fixed to the head carriage, but conventionally the head block is fixed to the head carriage with screws, so simply fixing the head block to the head carriage does not work, even if the magnetic Even if the head 16 is accurately positioned and fixed to the head block, the positioning of the magnetic head 16, which requires high accuracy on the micron order, cannot be performed with good reproducibility depending on the tightening condition of the screws. Conventionally, the magnetic head 16 is positioned again after the head block is fixed to the head carriage, but in order to accurately determine the position of the magnetic head 16, it is necessary to Furthermore, adjustments in various directions such as tilting and tilting must be simultaneously satisfied, and such work requires special adjustment jigs and measuring instruments, requires skill, and requires replacement of the magnetic head 16. There is a problem in that the work is a time-consuming and complicated work.

The present invention solves the fJM point in the conventional magnetic head replacement work, and provides a head block that facilitates magnetic head replacement by eliminating the need for subsequent magnetic head positioning work when installing the head block. is intended to provide.

Means for Solving the Problems> In order to achieve this object, the four-way mechanism according to the present invention has a structure in which a magnetic head that performs recording and reproduction by contacting a rotating magnetic sheet is fixed at a predetermined position. On the other hand, a pressing portion having a semicircular cross section that fits into a positioning pin having a circular cross section protruding from the front surface of the mounting surface on which the head block is mounted is recessed, and the mounting surface tζ A first magnet that attracts each other to the protruding magnet is embedded, a second magnet that attracts each other to the magnet embedded in the mounting surface is embedded in the bottom, and a removable bolt that can be protruded is embedded in the bottom. It is characterized by having a screw hole for screwing.

Function> The head block is positioned at a desired position by the pressing portion of the head block coming into contact with the positioning pin, and thereby the magnetic head fixed to the head block is positioned. The first magnet embedded in the front surface applies a magnetic force that urges the head block forward and presses the pressing part against the positioning pin, and the second magnet embedded in the bottom surface biases the head block against the mounting surface. Bring it into close contact. On the other hand, when removing the head block, screw the removal bolt 1- into the screw hole and rotate the removal bolt so that its tip protrudes from the bottom of the head block to release the magnet. Ru.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a head block according to an embodiment of the present invention, the cause of the figure is a plan view, the direction of the figure is
C) is a front view, and p) is a bottom view. Further, FIG. 2 is a side view of the main parts of a magnetic recording device according to an embodiment of the present invention, and FIG. 3 is a plan view of the head block mounting surface thereof.

First, a magnetic recording device will be explained. Figures 2 and 3
As shown in the figure, the herad carriage 21 having the head block mounting surface 20 on the upper surface has a magnetic sheet 12 as a whole.
supported for radial movement. The head carriage 21 includes a base table 22, a wedge-shaped intermediate table 23, and a mounting table 24 on which the head block mounting surface 20 is formed.
The base 22 has a magnetic sheet 12 mounted on a slide 25 fixed to the device body (not shown) by means of a rail 26.
It is supported so as to be slidable in the radial direction, and is driven to be fed by a stepping motor 27 via a feed screw (not shown). Further, an intermediate stand 23 having an inclined upper surface is movably supported on the base stand 22, and one end of the intermediate stand 23 is attached to a bracket 28 fixed to the base stand 22. It is pressed against the spindle 30 of the head 29 by a spring 311. A mounting table 24 having an inclined surface that engages with this inclined surface is placed on the upper surface of the intermediate table 23 in a supported manner so as to be able to move up and down, and is raised above the intermediate table 23 by a holder 32. Being oppressed. Therefore, by adjusting the amount of protrusion of the spindle 30 of the micrometer head 29, the intermediate table 23 is moved, and thereby the mounting table 24 is adjusted to move up and down via the inclined surface.

On the other hand, a spindle motor 33 is disposed in front of the head carriage 21, and the magnetic sheet 12 is attached to the rotating shaft 15 of the spindle motor 33 so as to be rotationally driven.

A positioning pin 34 having a circular cross section is protruded from the front part of the mounting surface 20 (ζ, the positioning pin 34 is
An anti-rotation bin 35 is provided protruding from behind. Further, a permanent magnet 36 is embedded in the mounting surface 20, and a support stand 37 is erected on both sides of the positioning pin 34, and a permanent magnet 38 is also embedded in the support stand 37. Furthermore, a flat reference surface 39 is formed on the upper surface of the mounting surface 20 and is machined with high precision.

On the other hand, as shown in FIG. 1, the head block 40 according to the present invention has a pressing portion 4 having a semicircular cross section that can fit into the positioning pin 34 on the front surface thereof.
1 is recessed, while the rotation prevention pin 35 is provided on the rear surface.
A recessed groove 42 is provided into which the holder can be fitted. Further, the head block 40 is made of a non-magnetic material, and has shoulders formed at both ends on its front surface, in which a first permanent magnet 43 that attracts the permanent magnet 38 buried in the support base 37 and the first permanent magnet 43 is buried therein. Furthermore, the bottom surface of the head block 40 has the aforementioned mounting surface 2.
A second permanent magnet 4 that attracts the permanent magnet 36 on the
4 are buried. Furthermore, a threaded hole 73 penetrating from the top surface to the bottom surface is provided approximately in the center of the head block 40, and a removal bolt 72 is screwed therein, and the removal bolt 72 can be rotated to remove the threaded hole 73. The tip can protrude from the bottom. The head block 40 is positioned by the pressing portion 41 of the head block 40 coming into contact with the positioning pin 34 of the mounting surface 20, and the rotation prevention pin 35 is fitted into the groove 42 of the head block 40, thereby positioning the positioning pin 34. Rotation around the center is prevented. Mana,
A first permanent magnet 43 embedded in the front surface of the shoulder of the head block 40 attracts the permanent magnet 38 and urges the head block 40 forward, and a second permanent magnet 43 embedded in the bottom surface of the head block 40 attracts the permanent magnet 38 and urges the head block 40 forward. Magnet 44 is permanent magnet 3
6 to bring the head block 40 into close contact with the reference surface 39 on the mounting surface 20. In addition, as shown in FIG. 4 showing the IV-IV cross-sectional view of the first gap, in this embodiment, the second permanent magnet 44 of the head block 40 is placed slightly with respect to the vA field surface 20 permanent magnet 36. The head block 40 is positioned at the rear so that the second permanent magnet 44 also obtains a force that urges the head block 40 forward. Furthermore, the first permanent magnet 43 is a permanent magnet 3 embedded in the support base 37.
8, so that the first permanent magnet 43 also obtains a force that urges the head block 40 toward the Ili placement surface 20 and prevents it from floating up. In this way, the first and second permanent magnets 43.
By appropriately shifting the head block 44 with respect to the positions of the permanent magnets 36 and 38 that attract them to each other, the head block 4
0 obliquely forward and downward, and a more stable mounting state of the head block 40 can be ensured. In addition, a recess 45 is provided at the base of the positioning pin 34 on the mounting surface 20, and a recess 45 whose surface is recessed compared to other parts is provided, and a recess 46 is also provided on the bottom side of the pressing part 41 of the head block 40, and a recess 46 is provided at the base of the positioning pin 34. For example, when foreign matter such as dust accumulates on the head block 40, it is prevented from coming into contact with the head block 40 and lifting the head block 40.

On the other hand, when removing the head block 40, the close contact between the magnets 36 and 44 is released by protruding the tip of the removal bolt 72 from the bottom surface of the head block 40, and the head block 40 can be easily removed. That is, in general, when magnets are brought out of close contact with each other, their attractive force is extremely reduced.
If you try to pull it away from the close contact state of 6, 44,
Although a large force is required, there is a risk that the head block 40 will come off with force as soon as the magnets 36 and 44 are released from close contact with each other, and the head block 40 will hit other parts. In contrast, rotate the removal bolt 72 to remove the magnet 36.4 in advance.
The head block can then be easily and safely removed by releasing the close contact in step 4. In addition, in this embodiment, as shown in FIG. 5 showing the V and -V cross-sectional views of the first gap, notches 47 are formed on both sides of the head block 400 so that the width is narrower on the bottom side. This makes it easy to handle the head block 40 when it is attached or detached.

Further, a magnetic head 16 is provided on the upper surface of the head block 40.
is positioned and fixed.

That is, while the auxiliary block 48 is fixed to the upper surface of the head block 40 with bolts 49, the magnetic head 1
The support plate 50 to which 6 is fixed is fixed to a mounting plate 51 with bolts 52, and the mounting plate 51 is fixed to the auxiliary block 48 with an adhesive while being positioned.

In this embodiment, the head gap of the magnetic head 16 is located on the central axis of the pressing portion 41 of the head block 40.

This magnetic head 16 has the above-mentioned protrusion amount Ea and deviation amount E.
b, tilt angle θa, azimuth angle θb, tilt angle θC, etc. are positioned within allowable ranges and fixed to the head block 40. This is done using, for example, a head mounting jig as shown in FIGS. 6 and 7 This is done using

FIG. 6 is a plan view of the head mounting jig, and FIG. 7 is a front view thereof. As shown in the figure, the head mounting jig 5
3 has the same mounting surface as the head block mounting surface 20 of the magnetic recording device, that is, a positioning pin 54 and a rotation prevention pin 5.
5, a mounting table 57 equipped with a magnet 56, etc., is provided, and the head block 4 is mounted in the same manner as for the magnetic recording device.
0 can be positioned and removably installed. On the other hand, a holding table 58 that holds the mounting plate 51 to which the magnetic head 16 is attached is located close to the mounting table 57. The holding table 58 is supported on an azimuth adjustment table 59 so as to be rotatable in the azimuth direction around the magnetic head 16, and the azimuth adjustment table 59 can also be tilted in the tilt direction around the magnetic head 16 like the tilt adjustment table 60. Further, the tilt adjustment table 60 is supported by a tilt adjustment table 61 so as to be tiltable in the tilt direction with the magnetic head 16 as the center. slope rlJ
The joint stand 61 is further slidably supported in two directions on the height yAWJ stand 62, and the height adjustment stand 62 is supported on the front and back adjustment stand 6.
3 so as to be slidable in the front-rear direction (horizontal direction in FIG. 6), and furthermore, the front-rear adjustment table 63 is supported by a left-right adjustment table 64 so as to be slidable in the left-right direction. Each of these 58.59.60
゜61, 62, 63+, respectively azimuth adjustment 65
, turn the tilt yAs screw 66, the tilt adjustment screw 67, the height adjustment screw 68, the front/rear adjustment screw 69, and the left/right adjustment screw 70*
gl! The magnetic head 16 attached to the holding table 58 can be positioned at an accurate position. Thus, the head block 40 is mounted on the mounting table 57, and the magnetic head 16 mounted on the holding table 58 is
is accurately positioned relative to the head block 40 while observing it with the QiIk deflector 71 located above it, and in this positioned state, the auxiliary block 48 on the head block 40 side and the mounting plate 51 on the magnetic head 16 side are bonded. The magnetic head 16 is fixed at a predetermined position on the head block 40 by adhering with an adhesive. Here, if the auxiliary block 48 and the mounting plate 51 are tilted in the positioned state or the gap is too large,
Loosen the head block 40 (and the auxiliary block 4
Adjust the position of 8.

Therefore, according to such a configuration, the magnetic head 16
The head block 40 to which is positioned and fixed is the head block 1 of the magnetic recording device! By attaching it to the device surface 20, the g1 air head 16 is positioned at a desired position, and when attaching the head j' block 40 to the head block mounting surface 20, accurate positioning is achieved using the positioning pin 34, and a magnet is used. Since the head block 40 is fixed using the head block 40, its attachment becomes easy. On the other hand, during removal, the close contact between the magnets 36 and 44 is released by protruding the tip of the removal bolt 72 screwed into the screw hole 73, and the head block 40 can then be easily removed.

In this embodiment, the positioning bin 3 of the head block 40
In order to prevent rotation around 4, a rotation prevention pin 35 is provided on the mounting surface 20, and a Fn 42 into which the pin 35 fits is provided in the head block 40. In addition, for example, the mounting surface 20
A recess may be provided in the recess, and the head block 40 may be fitted into the recess.

<Effects of the Invention> As described above in detail with reference to one embodiment, the head block of the present invention can be easily installed in the t-position position on the main body of the device, and the head block can be installed later. This eliminates the need for positioning work for the magnetic head, and it can be removed easily and safely using a removal bolt screwed into the screw hole, so the replacement work for the magnetic head can be extremely simplified.

[Brief explanation of drawings]

Fig. 1 shows a head block according to an embodiment of the present invention, in which the figure is a plan view, the figure () is a side view, the figure (q is a front view, and the figure (to) is a bottom view). Also, Fig. 2 is a side view of the main parts of a magnetic recording device according to an embodiment of the present invention, Fig. 3 is a plan view of the head block mounting surface, and Fig. 4 is a view of the first space. It/-IV sectional view of 5th
The figure is a sectional view taken along the line V-■ in Figure 1 (5), Figure 6 is a plan view of the head mounting jig, Figure 7 is a front view thereof, Figure 8 is a plan view of the magnetic sheet pack, and Figure 9 is a top view of the head mounting jig. 8 is an IX-IK sectional view, and FIGS. 10 to 12 are explanatory diagrams for positioning the magnetic head. In the drawings, 12 is a magnetic sheet, 16 is a magnetic head, 20 is a head block mounting surface, 34 is a positioning pin, 35 is a rotation prevention pin, 3G, 38 is a permanent magnet, 40 is a head block, 41 is a pressing part, 42 is a groove, 43 is a first permanent magnet, 44 is a second permanent magnet Magnet, 72 is a bolt for removal, 73 is a spring screw hole. Fig. 1 (A) Fig. 1 (B) Fig. 1 (C) Fig. 1 to Fig. 1 (D) Fig. 4 Fig. 5 Fig. 6 Figure 7 Figure 8 Figure 9 (, ζ

Claims (3)

[Claims] (1) A positioning pin with a circular cross section protrudes from the mounting surface on which the head block is mounted, while the magnetic head that records and plays by contacting the rotating magnetic sheet is fixed in a predetermined position. A pressing part having a semicircular cross section that fits into the mounting surface is recessed, and a first magnet that attracts each other to the magnet protruding from the mounting surface is embedded, and the magnet embedded in the mounting surface is embedded in the bottom surface. A head block characterized in that a second magnet that attracts each other is buried therein, and a threaded hole into which a protruding removal bolt is screwed is provided in the bottom surface. (2) The buried position of the first magnet is shifted from a magnet protruding from the mounting surface that attracts the head block so as to urge the head block toward the mounting surface. A head block according to claim 1. (3) The embedded position of the second magnet is shifted from the magnet embedded in the mounting surface that attracts the head block so as to bias it toward the positioning pin. A head block according to claim 1 or 2.