JPS6142324B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a sheet-type recording and playback device that includes:
Regarding a magnetic head that performs recording and playback by moving spirally or concentrically on a magnetic sheet surface, in detail, a method for adjusting the position of a magnetic head in a sheet-type recording and playback device that uses a magnetic head unit in which such a magnetic head is assembled on a moving base. The present invention relates to a jig for adjusting the gap position of a magnetic head or a jig for positioning a guide shaft on a turntable, which is used directly to carry out the position adjustment method.

An example of a sheet-type recording and reproducing apparatus in which a magnetic head moves spirally on a magnetic sheet surface to perform recording and reproduction is shown in FIG. 1, for example. FIG. 1 shows an external perspective view of this type of sheet-type recording and reproducing device with the magnetic sheet removed. In FIG. 1, the reference numeral t indicates a turntable, which is constructed by covering a dish-shaped main body with a cap-shaped decorative board. The turntable t is installed approximately in the center of the main body of the device, and the top surface of the decorative plate is almost flush with the surrounding setting table S, and the elastic rotating body disposed inside the device is in contact with the outer periphery of the turntable. , it is starting to give it some rotation. A long hole O is bored in the decorative plate of the turntable t in the radial direction, and a magnetic head h installed in the main body of the apparatus protrudes from the long hole O, as will be described later.
The magnetic head h is connected to the turntable t.
As it rotates, it also moves in the radial direction, and its movement locus is spiral-shaped.

As described above, the magnetic sheet setting stand S is provided on the outer circumferential surface of this turntable housing portion of the main body of the apparatus. This setting table S is formed into a flat shape,
There are several fixed pins set up there. Although not shown, the fixing pin p is fitted into the fitting hole of the magnetic sheet, and the magnetic sheet is removably set on the setting table S with the magnetic surface facing downward. The core portion of the magnetic head h is elastically pressed against the magnetic sheet, and a presser plate c is placed on top of the core portion to press the magnetic sheet.

FIG. 2 is a plan view showing the internal mechanism of the turntable of the sheet-type recording and reproducing apparatus shown in FIG. 1.
In this FIG. 2, what is indicated by a two-dot chain line 1 indicates the outline 1 of the turntable storage section shown in FIG. Indicates m. The turntable rotates around a rotating shaft 1. A fixed helical gear 2 is coaxially fixed to the rotating shaft 1, and the fixed helical gear 2 meshes with a rotating helical gear 3. This rotating helical gear 3 is fixed with a set screw to a guide shaft 5 formed integrally with the feed screw 4, and rotates integrally with the feed screw 4 around the guide shaft 5. The guide shaft 5 is held in the radial direction of the turntable, with one end supported by a rising portion 6a of a bracket 6, and the other end supported by an auxiliary bracket 7. The bracket 6 and the auxiliary bracket 7 are fixed on the turntable body by a plurality of screws 8 or 9. The aforementioned feed screw 4 has a feed pawl 10.
mesh together. The feed claw 10 extends from one side of the tip of the feed lever 11 toward the turntable, and the feed lever 11 is held rotatably about a shaft 12. The shaft 12 is supported by a moving table 13 substantially parallel to the turntable.

The moving table 13 has a horizontal portion 13a extending parallel to the turntable in the radial direction of the turntable.
, one vertical portion 13b extending from one end of the horizontal portion 13a in a direction perpendicular to the turntable, the other vertical portion 13c extending from the other end of the horizontal portion 13a in a direction perpendicular to the turntable, and the vertical portion. It consists of a mounting part 13d extending parallel to the turntable again from the lower end of the turntable 13c. Then, the shaft 12 is appropriately supported by one vertical portion 13b. Also,
The other vertical part 13c has a long hole 13 open on one side.
e is bored (see FIG. 3), and one end of the aforementioned guide shaft 5 is slidably fitted into the elongated hole 13e. Furthermore, the magnetic head h shown in FIG. 1 is held on the mounting portion 13d by appropriate means.

As can be seen from FIG. 2, a guide shaft 14 passes through the vertical portions 13b and 13c of the movable table 13, and the movable table 13 is supported so as to be slidable along the guide shaft 14. The guide shaft 14 has one end supported by a rising portion 6a and the other end supported by another rising portion 6b of the bracket 6, similar to the guide shaft 5 described above, and is parallel to the guide shaft 5 with the fixed helical gear 2 in between. is maintained. And, it is prevented from coming off by fixing rings 15 and 16.
These rising portions 6a and 6b are both erected parallel to each other and perpendicular to the turntable.
The movable table 13 is further provided with a bent portion 13f bent from an end surface adjacent to the vertical portion 13b in a direction perpendicular to the turntable. The bent portion 13f and the rising portion 6b of the bracket 6
A tension spring 17 is stretched between the movable base 13 and
The behavior is always in the direction of arrow a.

Therefore, in this type of sheet-type recording and playback device, when rotation is applied to the turntable, the rotating helical gear 3 meshing with the fixed helical gear 2
rotates, and the feed screw 4 that meshes with it rotates. Since the feed claw 10 is engaged with the feed screw 4, the rotation of the feed screw 4 causes the feed lever 11 to move along the guide shaft 14 together with the moving table 13. Therefore, the feed pawl 10 that was initially on the side of the rotating helical gear 3 at one end of the feed screw 4 is
is sent against the tension spring 17, and moves in the radial direction of the turntable as shown by arrow b in FIG. When the feed pawl 10 reaches the other end of the feed screw 4 as shown, the feed lever 11
An auto-return lever (not shown) is pushed by a protruding piece 11a raised perpendicular to the turntable from the middle, and the auto-return cam is activated. The auto-return cam lifts the feed lever 11 to release the mesh between the feed pawl 10 and the feed screw 4. Then, the force of the tension spring 17 acts on the movable table 13, and the end surface 12a of the shaft 12 moves to the rising portion 6b.
Return the movable table 13 to the position where it abuts the tip of the stop screw 18 held by the holder. Therefore, the feed lever 11
The feed screw 4 also returns together with the moving table 13, returns to the original position of the feed screw 4, and engages with it. Then, it is sent again by the feed screw 4 in the direction of arrow b in FIG.

Therefore, the magnetic head h on the movable table 13 rotates around the rotation axis 1 as the turntable rotates, and is also sent in the radial direction of the turntable according to the feed pawl 10, so that its movement trajectory becomes a spiral. It becomes like this.

A sheet-type recording and reproducing device in which a magnetic head moves spirally on a magnetic sheet surface to perform recording and reproducing has, for example, the structure and operation as described above. Therefore, in this type of sheet-type recording/playback device, even if the position of the magnetic head h is slightly shifted in the radial direction of the turntable or slightly shifted in the tangential direction, the frequency of the reproduced sound will remain the same. There was a drawback that the characteristics deteriorated.

Assume now that in this type of sheet-type recording and reproducing apparatus, the gap position of the magnetic head h is tangentially shifted by α from the normal position u on the center line to a position v, as shown in FIG. At this time, the radius of the recording track is R, and the angular deviation θ=
When tan ^-1 (α/R) is examined, it is as shown in Figure 5. As can be seen from the figure, the angular deviation θ
becomes larger as the recording track radius R becomes smaller, and the influence of the positional deviation α becomes very large.
Therefore, in a sheet-type recording/playback device where the radius R of the recording track and its pitch are small,
In particular, it is necessary to adjust this to prevent positional deviation α, and it is necessary to set the gap position of the magnetic head h to the normal position and to always face the center to eliminate positional deviation. It was hot.

Therefore, in this type of sheet-type recording and reproducing apparatus, the position of the magnetic head h has conventionally been adjusted after it has been assembled. However, in small sheet-type recording and reproducing devices, it is truly difficult to adjust the position of the magnetic head without causing positional deviation, and the adjustment work is often inefficient. In particular, those with a rotation radius of 20 mm or less had the disadvantage that even if the mounting position of the magnetic head was slightly tangentially shifted from its normal position, the angular shift would become large.

Therefore, the present invention aims to eliminate such drawbacks. However, prior to this application, the applicant had filed an application for a method for adjusting a magnetic head for the above purpose (Japanese Patent Application No. 40696/1982). The invention according to this previously filed application constitutes one magnetic head unit with a moving base on which a magnetic head is attached, and the magnetic head unit is attached to an adjustment jig so that the positional deviation of the magnetic head can be adjusted by itself. This is a method for adjusting a magnetic head in which the adjusted magnetic head unit is mounted on a turntable using an accurately positioned guy shaft as a guide. The invention according to the previously filed application is, for example, a second
As shown in FIGS. 3 and 6, a magnetic head unit is constructed, and the contents of the invention will be explained in detail below.

Placing section 1 of the sheet-type recording and playback device shown in Fig. 2
As shown in FIGS. 3 and 6, the base end of the adjustment table 19 is stacked on the back side of the mounting table 13d.
The mounting table 13d is mounted by an eccentric shaft 20 passing through the
It is slidably attached to the and,
Bent portion 1 provided on the free end side of this adjustment table 19
As shown in FIG. 2, an adjustment screw 21 passing through the vertical portion 13c of the moving table 13 is screwed into the portion 9a. A compression spring 22 is wound around the adjustment screw 21, and the head of the adjustment screw 21 is pressed against the vertical portion 13c to give the adjustment table 19 a counterclockwise rotation habit in FIG. Adjust the screw 2
It is held so that it can be adjusted by turning 1.

As can be seen from FIG. 3, the base of a fixing pin 23 is firmly planted at the free end of the adjustment table 19, and a sleeve 24 is loosely fitted onto the fixing pin 23. The sleeve 24 is fixed downward to the back side of one wing of the support plate 25, and a support spring 26 is wound around the outer circumference of the sleeve 24, and the support spring 26 is attached to the adjustment table 19.
and the support plate 25, and the support spring 26
One wing of the support plate 25 is supported by. The support plate 25 is a long plate member bent to form a recess in the center, and the magnetic head h is placed on the recess. Both wings of the support plate 25 extend parallel to the turntable, and a long hole 25a is bored in the other wing, into which a guide pin 27 is fitted. The guide pin 27 is erected on the mounting portion 13d of the movable table 13 by the eccentric shaft 20 described above. A support spring 28 is wound around the outer periphery of the guide pin 27, and the other wing of the support plate 25 is supported by the support spring 28.
The support plate 25 is supported by the support springs 26 and 28, and the magnetic head h has a third
In the figure, it always has an upward habit and is placed on the placing portion 13d. As mentioned above, this magnetic head h has a core portion that protrudes through a long hole O (see Fig. 1) bored in the decorative board.
It is elastically pressed against the lower surface of the magnetic sheet and moves along its spiral recording/reproducing track, recording information thereon or reproducing information therefrom.

The eccentric shaft 20 has a head 20 as shown in FIG.
a, an eccentric portion 20b adjacent to the head thereof, a cylindrical portion 20c adjacent to the eccentric portion, and a threaded portion 20d at the tip. First, the head 20a
A screwdriver groove is cut in the shaft so that the eccentric shaft 20 can be rotated by a screwdriver or the like. Eccentric part 20
b fits into a round hole of the adjustment table 19, and by rotating the eccentric shaft 20, the adjustment table 19 can be slid with respect to the mounting portion 13d. In addition, the cylindrical part 2
0c fits into the round hole of the mounting portion 13d. The threaded portion 20d is screwed into the base of the guide pin 27. Therefore, by rotating the eccentric shaft 20 and moving the adjustment table 19 to adjust the position of the magnetic head h, by tightening the guide pin 27,
While fixing the eccentric shaft 20, the mounting portion 13
A guide pin 27 can be erected on d.
A knurl 27a is provided on the outer periphery of the lower end of the guide pin 27.
, the guide pin 27 can be easily tightened by holding its knurl 27a.

In the invention according to the previously filed application, first of all, the adjustment table 19 is connected to the eccentric shaft 20 with respect to the movable table 13.
After being temporarily fixed as shown in FIG. 6 by the and guide pins 27, the support springs 26 and 28 are arranged as shown in FIG. 3, and the support plate 25 on which the magnetic head h is fixed is fixed. The pin 23 and the guide pin 27 are used as guides to form a magnetic head unit that is supported as a whole.

The magnetic head unit H is set in a microscope K as shown in FIG. The microscope K has support members 29, 30;
It has a reference shaft 31 that can be freely inserted into and removed from the 0, and also has a guide shaft 32. A vertical reference line 33 of the measuring section is located at a certain distance d from the reference axis 31. The magnetic head unit H has a movable table 13 supported by a reference shaft 31 and a guide shaft 32, and is set on the microscope K. After that,
The eccentric shaft 20 of the magnetic head unit H is rotated so that the gap of the magnetic head h is aligned with the vertical reference line 33.
adjusted to suit. After adjustment, guide pin 2
By tightening 7, the position of the magnetic head h is fixed.

The magnetic head unit H whose gap position has been adjusted in this way is set in the azimuth angle adjuster A, as shown in FIG. This azimuth angle adjuster A is, for example, a modified general tape recorder, and has a master tape 34.
The magnetic head unit H can contact the magnetic head h by inverting the magnetic surface of the magnetic head unit H.
As shown in the figure, it is supported by guide shafts 35 and 36 provided on the azimuth angle adjuster A.
A test signal is recorded on the master tape 34, and while the test signal is being reproduced by the magnetic head h, the angular shift of the gap is adjusted so that the output level is maximized. Adjustment of this angular shift is performed by turning the adjustment screw 21 to rotate the adjustment table 19 around the eccentric shaft 20. In this way, the relative position of the magnetic head h with respect to the moving table 13 can be determined by rotating the eccentric shaft 20 and moving the adjusting table 19 in the lateral direction (direction perpendicular to the guide shaft 14) in FIG. Therefore, the positional deviation is adjusted, and the azimuth angle adjuster A
, operate the adjustment screw 21 to adjust the adjustment table 19.
Adjustment of the angular deviation is carried out by rotating the free end of.

After such adjustment, the magnetic head unit H
is mounted on a turntable as shown in FIG. 2 using a precisely positioned guide shaft 14 as a guide.

However, even in the adjustment method disclosed in the prior application, since the microscope K is used, the adjustment operator's eyes are tired and the work efficiency is reduced. Also,
Since the azimuth angle adjuster A is also used together with the microscope K as described above, there is a drawback that the adjustment process is increased.

Therefore, in order to eliminate such drawbacks, the present invention provides a method for adjusting the position of a magnetic head in a sheet-type recording/playback device that uses a magnetic head unit that can be adjusted without using a microscope, and a method for implementing the position adjustment method. It is an object of the present invention to provide a jig for adjusting the gap position of a magnetic head or a jig for positioning a guide shaft on a turntable, which can be used directly.

First, the magnetic head unit adjusted according to the present invention will be described in detail with reference to FIGS. 10 to 12. FIG. 10 is a plan view showing the internal mechanism of a turntable in a sheet-type recording and reproducing apparatus using the magnetic head unit. Figure 11 shows the
It is a sectional view taken along the line XI-XI, and FIG. 12 is a sectional view taken along the line XII-XII. In the sheet type recording and reproducing apparatus shown in these drawings, the other parts except the magnetic head unit H' are substantially the same as the conventional mechanism shown in FIG.
H' is likewise supported by guide shafts 5', 14' supported by main bracket 6' and auxiliary bracket 7'. That is, in the magnetic head unit H', the guide shaft 5' passes through the elongated hole 13e' formed in the vertical portion 13c' of the movable table 13', similar to the sheet type recording/reproducing device shown in FIG.
are supported through the vertical portions 37a, 37b of the guide plate 37. At this time, the magnetic head unit
The core gap of the magnetic head h' of H' is the guide shaft 1
It is adjusted so that it is in the position from 4' to d'.
Then, as the feed lever 11' is sent,
The moving table 13' moves in the radial direction of the turntable t' along the guide shafts 5' and 14'.

The magnetic head unit H' has an adjusting plate such as a guide plate 37 superimposed on, for example, the horizontal part 13a' of the movable table 13', and the guide plate 37 is fixed with a fixing screw 3.
8 and its fixing screw 38 between two eccentric pins 3
9 and 40. The fixing screw 38 and the eccentric pins 39 and 40 are arranged substantially in a straight line. The fixing screw 38 is the first
As shown in Figure 1, it loosely passes through the round hole 13a'' of the horizontal portion 13a' and is screwed into the screw hole of the guide plate 37 to fix the relative position of the movable plate 13' and the guide plate 37. The eccentric pins 39 and 40 shown as an example of the eccentric member have their eccentric cylindrical portions 39a and 4, for example.
0a fits into a round hole provided in the horizontal part 13a' of the moving table 13', the tip passes through the guide plate 37 and is semi-caulked, and when the fixing screw 38 is loosened, they can be rotated. By doing this, the mobile platform 1
The relative position between the guide plate 3' and the guide plate 37 can be changed. In the example shown in the drawing, the moving platform 1
From one end of the horizontal part 13a' of 3', the turntable
A vertical portion 13c' extends in a direction perpendicular to t'. The vertical portion 13c' has an elongated hole 13e' that is open at one end, and a round hole 13c''.The guide shaft 5' passes through the elongated hole 13e' as described above. In addition, a sufficient gap is provided in the round hole 13c'' when the tip of the guide shaft 14' passing through one vertical portion 37b of the guide plate 37 is mounted on the turntable t' as shown in the drawing. pass through. From the other end of the vertical portion 13c', the mounting portion 1 is again parallel to the turntable t'.
3d' is extended. This placing section 13d' has a first
As shown in Figure 2, a support plate 2 has a magnetic head h' fixed to it.
5' is supported via elastic members such as support springs 26' and 28'. The support springs 26' and 28' are arranged between the mounting part 13d' and the support plate 25', respectively, with the fixing pin 23' or guide pin 27' vertically erected on the mounting part 13d' as the center. has been done. The fixing pin 23' has a lower side of the collar part 23'a passing through the mounting part 13d', and is fixed by caulking its lower end, and its upper side is supported by the sleeve 24 which is supported downward from one wing of the support plate 25'. ' is inserted.
On the other hand, the lower side of the flange 27'a of the guide pin 27' also passes through the mounting part 13d', and is fixed by caulking the lower end thereof, and the upper side thereof is inserted into the elongated hole 25a provided in the other wing of the support plate 25'. ' is fitted.

The magnetic head unit adjusted according to the present invention is constructed as described above, for example. 10th
The configurations shown in FIGS. 12 to 12 are merely examples, and are not limited to the illustrated examples. For example, the magnetic head may be placed on the movable table by an appropriate means via an elastic material, or the magnetic head may be placed on the movable table by appropriate means. The shape is not particularly limited and can be changed as appropriate, and the shape of the adjusting plate superimposed on the moving table can also be changed. Since the adjustment plate adjusts the position of the magnetic head on the turntable by changing its relative position with the moving table, it may be superimposed on the guide shaft side of the moving table as in the embodiment, or it may be overlapped with the guide shaft side of the moving table. It may also be polymerized on the magnetic head side of the magnetic head. Of course, the position of the eccentric member disposed at the overlapping portion can also be changed.

Next, a method for adjusting the position of the magnetic head h' in a sheet type recording/reproducing apparatus using such a magnetic head unit H' will be explained. To adjust the position of the magnetic head h', first adjust the position of the magnetic head h' in the magnetic head unit H', and then properly mount the adjusted magnetic head unit H' on the turntable. It is done. The former is made possible by using a magnetic head gap position adjustment jig, and the latter is made possible by accurately positioning the guide shaft on the turntable using a guide shaft position adjustment jig.

FIG. 13 is a schematic diagram showing the magnetic head unit H' attached to the gap position adjustment jig G. This gap position adjustment jig G
, a hook-shaped arm 52 is erected on a tape deck base 51, and two parallel through-holes are perpendicularly formed in the horizontal arm portion 52a of the hook-shaped arm 52. pin 5
3 and 54 are the collar portions 53a and 54a near the upper end thereof.
are inserted parallel to each other and hang downward. On the other hand, a reference magnetic head H' is installed on the tape deck base 51, and its core gap is fixed at a distance d' from one guide pin 54. This distance d′ is, for example, the first
In the case of the sheet-type recording and reproducing apparatus shown in FIG. 0, this corresponds to the distance d' between the guide shaft 14' and the core gap of the magnetic head h' when the magnetic head unit H' is properly attached to the apparatus.
This gap position adjustment jig G is provided with a feeding mechanism for a test signal recording tape 55.
The test signal recorded on the magnetic head 5 is attached so as to be reproducible by the reference magnetic head h'' mentioned above and the magnetic head h' of the magnetic head unit H' attached for adjustment as will be described later.

The magnetic head unit H' to be adjusted is attached to such a gap position adjustment jig G as shown in FIG. 13, and the position of the magnetic head h' is adjusted. That is, the guide pin 53 is inserted into the long hole 13e' of the magnetic head unit H', and the guide pin 53 is inserted into the long hole 13e' of the magnetic head unit H'.
4 into the vertical portions 37a, 37b of the guide plate 37, and attach the magnetic head unit by appropriate means.
Prevents H′ from falling off. At this time, the magnetic head h' of the magnetic head unit H' is juxtaposed with the reference magnetic head h'' fixed on the tape deck base 51. In this state, the feeding mechanism for the test signal recording tape 55 is operated. and have the oscilloscope draw the reproduction outputs of the magnetic head h' and the reference magnetic head h'', respectively. For example, in the state shown in FIG. 14A, the magnetic head
Since there is a phase shift between the reproduced output A of h' and the reproduced output B of the reference magnetic head h'', the magnetic head
It can be seen that the gap position of h' is shifted. Therefore, the semi-caulked eccentric pins 39 and 40 are rotated to determine the gap position so that there is no phase shift between the reproduction outputs A and B, as shown in FIG. 14B. At this time, the eccentric pins 39 and 40 are also rotated so that the reproduction output i of the magnetic head h' becomes maximum. Then, the magnetic head h′ and the reference magnetic pad
There is no phase shift between the playback outputs A and B, and
After confirming that the reproduction output A of the magnetic head h' is at its maximum, tighten the fixing screw 38, and then tighten the guide plate 3.
7 and the moving table 13' are fixed.

In addition, the gap position adjustment jig G shown in FIG.
Of course, this jig is an embodiment of the present invention, and the jig according to the present invention is not limited to the configuration shown in FIG. The feeding structure of the recording tape, etc. may be changed as appropriate without changing the characteristics of the present invention.

15 and 16 show a state in which the turntable is attached to the guide shaft positioning jig, FIG. 15 is a plan view of that state, and FIG.
The figure is a sectional view taken along the - line in that state. As shown in these FIGS. 15 and 16,
The guide shaft positioning jig J consists of a jig base _J1 and a setting jig _J2 . The jig base _J1 is formed into a rectangular shape, and a central shaft 60 is erected at the center thereof. A center hole of a boss 62 fixed to the back surface of the turntable t' with a plurality of screws 61 is fitted into the center shaft 60, and the turntable t' is supported on the jig base _J1 . A reference pin 63 is also erected on the jig base _J1 . The reference pin 63 passes through the elongated hole 64 of turntable t' and stops rotation of turntable t'.

When positioning the guide shaft using this jig J, a bracket 6' is placed on the turntable t' as shown in FIGS. 15 and 16, and the rising portions 6a', 6 of the bracket 6' are
Insert the jig guide shaft 14'' into b'. Then, insert the setting jig _J2 so that its center hole 65 fits into the center shaft 60 and its tail groove 66 fits into the reference pin 63. Place it on the boss 62.The setting jig _J2 has arm parts 67 and 68 formed therein, and the reference groove 67 is inserted into the arm parts 67 and 68 from below.
a, 68a are provided. By inserting the jig guide shaft 14'' into the reference grooves 67a and 68a, the bracket 6' can be positioned at a predetermined position on the turntable t'.
By tightening the plurality of screws 8' in this state, the bracket 6' can be accurately fixed on the turntable t'.

Therefore, as mentioned above, the guide shaft 1 is attached to the bracket 6' which is accurately positioned on the turntable t'.
The position of the magnetic head h' is adjusted by supporting the magnetic head 4' and attaching the adjusted magnetic head unit H' adjusted by the magnetic head gap position adjustment jig G using the guide shaft 14' as a guide. I can do it.

Therefore, according to the present invention, since the configuration of the magnetic head unit is relatively simple, it is easy to manufacture and assemble it, and moreover, the gap position adjustment jig and the guide shaft positioning jig can be easily assembled without using a microscope. Because the position of the magnetic head can be adjusted simply by using the Become.

[Brief explanation of the drawing]

FIG. 1 shows an external perspective view of the sheet-type recording and reproducing device with the magnetic sheet removed. FIG. 2 is a plan view showing the internal mechanism of the turntable of the sheet-type recording and reproducing apparatus shown in FIG. Figure 3 shows
It is a sectional view taken along the - line. FIG. 4 is a schematic explanatory diagram showing the positional deviation of the core gap in the magnetic head. FIG. 5 is a diagram showing the relationship among recording track radius R, core gap positional deviation α, and angular deviation θ. FIG. 6 is a partially cutaway enlarged view showing an enlarged portion of the eccentric shaft in FIG. 3. FIG. 7th
This figure shows a schematic diagram of the magnetic head unit in the sheet-type recording and reproducing apparatus shown in FIGS. 2 and 3 set in a magnetic head position adjustment jig using a microscope. Figures 8 and 9 are
Similarly, the schematic configuration of the magnetic head unit when it is set in the azimuth angle adjuster A is shown, with FIG. 8 being a front view and FIG. 9 being a rear view. FIG. 10 is a plan view showing the internal mechanism of a turntable in a sheet type recording/reproducing apparatus using a magnetic head unit adjusted according to the present invention. FIG. 11 is a sectional view taken along the line XI-XI. FIG. 12 is a sectional view taken along the line XII-XII. FIG. 13 is a schematic diagram showing the magnetic head unit attached to the gap position adjustment jig. Figure 14 shows the magnetic head h' in Figure 13 and the reference magnetic head.
15 and 16 are graphs showing the playback output when there is a phase difference, and B when there is no phase difference. Figures 15 and 16 are graphs showing the playback output when the turntable is attached to the guide shaft positioning jig. Fig. 15 is a plan view of the state, and Fig. 16 is a cross-sectional view taken along the - line in that state.h, h'...Magnetic head, h''...Reference magnetic head, t, t'... ...turntable, 5, 5', 1
4, 14'... Guide shaft, 13, 13'... Moving table, 26, 26', 28, 28'... Support spring which is an example of an elastic material, 37... Guide plate which is an example of an adjustment plate. 38... Fixing screw, 39, 40... Eccentric pin which is an example of eccentric member, 53, 54... Guide pin, 55... Test signal recording tape, 60...
... Central axis, 63 ... Reference pin, 65 ... Center hole which is a fitting part for positioning, 66 ... Tail groove which is a fitting part for positioning, 67a, 68a ... Guide groove,
H, H'...Magnetic head unit, G...Gap position adjustment jig, _J1 ...Jig base, _J2 ...Set jig, J...Guide shaft positioning jig.

Claims (1)

[Claims] 1. Set a magnetic head unit in a gap position adjustment jig, line up the magnetic head with a reference magnetic head of the jig, and apply the same test signal recording tape to the magnetic head and the reference magnetic head. , guiding both the reproduction outputs of the magnetic head and the reference magnetic head to an oscilloscope, and operating the eccentric member of the magnetic head unit so that the phases of the reproduction outputs match and the reproduction output of the magnetic head is maximized. Adjusting the position of the magnetic head in a sheet-type recording/playback device in which the magnetic head position is adjusted, and then the adjusted magnetic head unit is mounted on the turntable using a guide shaft that has been accurately positioned on the turntable as a guide. Method. 2. A guide pin that sets the magnetic head unit to be adjusted in a predetermined position, a reference magnetic head that is fixed in a predetermined position with respect to the guide pin, and a test that is simultaneously reproduced with the reference magnetic head and the magnetic head of the magnetic head unit. A magnetic head gap position adjustment jig comprising a signal recording tape and a feeding mechanism for the test signal recording tape. 3. A jig base on which a central axis that determines the center of the turntable and a reference pin that determines the rotational position of the turntable are installed, and a jig base that connects the central axis and the reference pin via the turntable set on the jig base. A guide shaft positioning jig on a turntable comprising a setting jig having a fitting part for positioning that fits together and a guide groove for determining the position of the guide shaft on the turntable.