JPS62200511A - Head block - Google Patents

Abstract

PURPOSE:To simplify the exchanging work of a magnetic head, by positioning a head block on which the magnetic head is positioned and fixed with a locator pin, and fixing it with a magnet. CONSTITUTION:A magnetic head 16 is positioned and fixed exactly to a block 40 observing it with a microscope. The pushing part 41 of the block 40 is abutted with the positioning pin 34 of a placing plane 20, then being positioned, and a turn centering the pin 34 is blocked by fitting a pin 35 in a groove 42. Also the block 40 is energized in a forward direction by bringing together a permanent magnet built in the front plane of the shoulder part of the block 40 with the permanent magnet on the placing plane 20, and also, the block 40 is stuck closely with a reference plane of the placing plane 20 by bringing together a permanent magnet 44 on the bottom plane of the block 40 with a permanent magnet 36. In this way, it is no necessary to perform the positioning of the head 16 after mounting the block 40, then it is possible to simplify the exchanging work of the head 16.

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 electronic still camera, which has already become obsolete, 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 the line IX-DC in FIG. A magnetic sheet 12 on which still image information and the like are recorded is rotatably housed. A center core 13 as a reinforcing member is provided in the center of the magnetic sheet 12, and this center core 13 is exposed to the outside through a circular opening 14 of the magnetic sheet pack 11.
When the magnetic sheet pack 11 is loaded into the rotating magnetic sheet device, the center core 13 is chucked onto the 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. Then, while rotating the magnetic sheet 12 at high speed (3600 rpm), the magnetic head 16 is pressed against the recording surface with a predetermined contact pressure (normally, the magnetic sheet 12 is pushed up by about 100 μm) to perform magnetic recording and magnetic recording. During reproduction, the magnetic sheet 12 has a width of 0 with a pinch interval of 0.111111, for example.
, 06 mm magnetic) 52 racks are formed.

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. For these reasons, the magnetic head 16 used in electronic still cameras and the like has a protrusion amount Ea and an inclination angle θa with respect to the magnetic sheet 12 shown in FIG. 10, a deviation amount Eb with respect to the center of the magnetic sheet 12 shown in FIG. Azimuth angle θb1
The tilt angle θC shown in FIG. 12, etc. must be within a predetermined tolerance range. In addition, in Fig. 110, 19
is provided at a position facing the magnetic head 16 while sandwiching the magnetic sheet 12, and connects the sheet 12 with the magnetic head 16.
6 is a regulation plate.

Since this magnetic head 16 needs 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 rotated in the direction WjXa by means of fixing means such as screws.

<Problem to be solved by the invention> By the way, as mentioned above, a very fine magnetic spatula 1:16
If the magnetic head 16 is used in contact with the magnetic sheet 12 with a certain contact pressure, the magnetic head 16 will wear out. Then, the magnetic head 1 against the 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 should be done in advance.
This is done by replacing the fixed head block with 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 is difficult. To perform positioning of a magnetic head 16 with high reproducibility, which requires high accuracy on the microscale order depending on the tightening condition of screws, even if the magnetic head 16 is accurately positioned and fixed to a head block. I can't. Therefore, in the past, after fixing the head block to the head carriage, the magnetic head 16 was fixed again.
However, in order to accurately determine the position of the magnetic head 16, it is necessary to adjust the U in various directions such as the inclination, azimuth, and tilt of the magnetic head 16, as described above.
! These tasks require special adjustment jigs and measuring instruments, as well as skill, making replacing the magnetic head 16 a time-consuming and complicated task. There was a problem that they were both connected.

The present invention solves these problems 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.

To achieve this object, the head block according to the present invention has a configuration in which a magnetic head that performs recording and reproduction by contacting a magnetic sheet rotating U:fJ is placed at a predetermined position. On the other hand,
A head block is placed on the front surface, and a pressing part having a semicircular cross section that fits into a positioning pin having a circular cross section is recessed and protrudes from the placing surface. A first magnet that attracts each other to the magnet is buried therein, and a second magnet that attracts each other to the magnet buried in the placement surface is buried in the bottom surface.

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, the head block is removed by pulling the head block away from the mounting surface against the magnetic force of the first and second magnets.

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; Fig. 1 (5) is a plan view, Fig. 1) is a side view, and Fig.
q is a front view, and (2) 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, a head carriage 21 having a 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 pedestal 22, a wedge-shaped intermediate pedestal 23, and a 1a mounting pedestal 24 on which the head block mounting surface 20 is formed. The magnetic sheet 12 is slidably supported in the radial direction of the magnetic sheet 12 by a rail 26 thereon, and is fed and driven by a stepping motor 27 via a feed screw (not shown). Also, this base stand 2
2, an intermediate stand 23 with an inclined upper surface is movably supported, while one end of the intermediate stand 23 is fixed to the base stand 22! - It is pressed by a spring 3) to the spindle 30 of the micro make head 29 attached to 28. 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 pressed against the upper surface of the intermediate table 23 by a spring 32. There is. Therefore, by adjusting the amount of protrusion of the spindle 30 of the micrometer/rad 29, the entire intermediate 23 is moved, thereby adjusting the vertical movement of the mounting table 24 via the inclined surface.

On the other hand, a spindle motor 33 is disposed in front of the −\rad carriage 21, and a magnetic sheet 12 is attached to its rotating shaft 15.
is attached so that it can be rotated.

A positioning pin 34 having a circular cross section is protruded from the front part of the mounting surface 20, and a rotation prevention pin 35 is protruded from the rear of the positioning pin 34. In addition, the mounting surface 2
0, a permanent magnet 36 is buried therein, and a support stand 37 is erected on both sides of the positioning bit 34, and a permanent magnet 38 is also buried in the support stand 37. moreover,
A flat reference surface 39 machined with high precision is formed on the upper surface of the mounting surface 20.

On the other hand, as shown in FIG. 1, the head block 40 according to the present invention has a pressing portion 4 on the front surface of which has a semicircular cross section that can fit into the positioning pin 34.
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.
Permanent magnet 36 on 0 and permanent magnet 4 on @2 attracting each other
4 are buried. 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 of the head block 40 is positioned.
By fitting into the groove 42, rotation about the positioning pin 34 is prevented. Further, the 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 the 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. The permanent magnet 44 attracts the permanent magnet 36 and brings the head block 40 into close contact with the reference surface 39 on the mounting surface 20. Incidentally, as shown in FIG. 4, which shows a sectional view taken along the line ■-■ of the first gap, in this embodiment, the second permanent magnet 44 of the head block 40 is placed slightly away from the permanent magnet 36 of the mounting surface 20. 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 positioned slightly above the permanent magnet 38 embedded in the support base 37, so that the first permanent magnet 43 also causes the head block 40 to be attached to the mounting surface 20 side. This is done to obtain the strength to prevent it from floating up. In this way, by appropriately shifting the first and second permanent magnets 43 and 44 with respect to the positions of the permanent magnets 36 and 38 that attract them to each other, the head block 40 is biased forward and diagonally downward, and the head block It is possible to secure a more stable mounting state of the 40-meter. In addition, a recess 45 is provided at the base of the positioning pin 34 on the mounting surface 20, and the surface is recessed compared to other parts.
A recess 46 is also provided on the bottom side of the pressing part 41 of the dowel block 40 to prevent foreign matter such as round dust from accumulating at the base of the positioning screw 34 when it hits the head block 40 and causes the head block 40 to lift up. It is prevented. On the other hand, as shown in FIG. 5, which shows a cross-sectional view of the first space, cutouts 47 are formed on both sides of the head block 40 so that the bottom side is narrower. This makes it easy to handle the 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
6 is fixed to the support plate 50 to the mounting plate 51.
Then, the mounting plate 51 is positioned on the auxiliary block 48 and fixed with adhesive in a t-position.

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 Eb.
, the tilt angle θa, the azimuth angle θb, the tilt angle θC, etc. are positioned within the permissible range, and the head block 40 is fixed to the head block 40 (for example, as shown in FIGS. 6 and 7). This is done using a head mounting jig.

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 a mounting surface that is the same 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 U1 head 16 is attached is located close to this mounting table 57. The holding table 58 is an azimuth adjustment table 59
The azimuth adjustment table 59 is rotatably supported in the azimuth direction with the magnetic head 16 as the center, and the azimuth adjustment table 59 is
It is also supported by the joint stand 60 so as to be tiltable in the tilting direction with the magnetic head 16 as the center, and furthermore, the tilting adjustment table 6
Similarly to the tilt adjustment table 617, the tilt adjustment table 617 is supported so as to be tiltable in the tilt direction with the magnetic head 16 as the center. The tilt adjustment table 61 is further supported by a height adjustment table 62 so as to be slidable in the vertical direction;
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 are azimuth adjustment screws 65,
Tilt adjustment screw 66, tilt adjustment screw 67, height adjustment screw 68, front and back adjustment screw 69, left and right! I! By rotating the knot screw 70, it can be moved in each adjustment direction, thereby allowing the magnetic head 16 attached to the holding base 58 to be positioned at an accurate position.

Then, the head block 40 is mounted on the mounting table 57, and the magnetic head 16 mounted on the holding table 58 is accurately placed against the head block 40 while observing it with a mirror 71 located above it. By positioning the auxiliary block 48 on the head block 40 side and the mounting plate 51 on the magnetic head 16 side with adhesive in the positioned state, the magnetic head 16 is attached to the head block 4.
0 is fixed in place. If the auxiliary block 48 and the mounting plate 51 are tilted or the gap is too large in the positioned state, loosen the bolts 49 to adjust the position of the auxiliary block 48 with respect to the head block 40.

Therefore, according to such a configuration, the magnetic head 16
The a-air head 16 is positioned at a desired position by attaching the head block 40, which has been positioned and fixed, to the head block mounting surface 201 of the magnetic recording device, and the attachment of the head block 40 to the head block mounting surface 20 is as follows. Since positioning pins 34 are used to accurately position the head block 40 and magnets are used to fix the head block 40, it is easy to attach and detach the head block 40.

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

<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 position of the device main body, and the head block can be installed later. There is no need to position the magnetic head, and magnetic
This makes it possible to extremely simplify the work of replacing the Rad.

[Brief explanation of drawings]

Figure 1 shows a head block according to an embodiment of the present invention, in which figure (5) is a plan view, figure (5) is a side view, figure (Q) is a side view, and figure (Q) is a side view.
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, FIG. 3 is a plan view of the head block mounting surface, and FIG. ■Cross-sectional view, Figure 5 is a ■-■ cross-section of the first gap, Figure 6 is a plan view of the head mounting jig, Figure 7 is its front view, and Figure 8 is a horizontal view of the magnetic sheet pack. , FIG. 9 is a cross-sectional view of FIG. In the drawing, 12 is a magnetic sheet, 16 is a magnetic head, 20 is a Radblock mounting surface, 34 is a positioning pin, 35 is a rotation prevention pin, 36, 38 is a permanent magnet, 40 is a head block, 41 is a 42 is a groove, 43 is a first permanent magnet, and 44 is a second permanent magnet. Patent application Agent: Fuji Photo Film Co., Ltd.

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 embedded therein. (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.