JPS6025019A - Head adjusting mechanism of recording and reproducing device - Google Patents

Abstract

PURPOSE:To adjust the azimuth direction and tilt of a head independently by supporting the substrate of the head at two points pivotally and allowing it to rotate around the axis connecting the two points together, adjusting the height at one of two pivot points, and utilizing said rotation and adjustment of the height at the pivot point. CONSTITUTION:A fitting member 14 utilizes a fine adjustment of an adjusting screw 22 to make a tilt adjustment of the magnetic head 16 in the track direction of a magnetic disk 1 around a positioning conic pin 21 as a pivot point. Further, an adjusting screw 16 fitted in the fitting member 14 is adjusted finely to adjust the head at right angles to a track 1 around the positioning pin 15 of the fitting member 14 as a pivot point. Further, the azimuth adjusting screw 18 of a bimorph support member 12 is adjusted finely to make an azimuth-directional fine adjustment as shown by an arrow A about positioning holes 12e and 12f of the support member 12 that a positioning conic pin 15 and a conic screw 16 for adjustment engage as pivot points. Thus, the azimuth adjustment and tilt adjustment are made independently.

Description

TECHNICAL FIELD The present invention relates to a recording and/or reproducing device, and particularly to a head adjustment mechanism in a recording and reproducing device that can adjust the position of the head with respect to a recording track of a recording medium. It is.

In prior art recording and reproducing apparatuses, it is necessary to accurately position the head with respect to the recording track of the recording medium because of variations in accuracy of manufactured components. Conventionally, this type of position adjustment involves tightening the three or four screws described above by attaching the head attached to a single board supported by three or four screws with springs inserted. By adjusting the degree, the position with respect to the recording track of the recording medium was adjusted. According to this, adjusting the height of one of the six or four screws will have a subtle effect on the height position adjusted by the remaining screws, making it difficult to adjust the position of the head relative to the recording track. That was cool.゛Object of the Invention The present invention solves the drawbacks of the prior art, and provides a head adjustment mechanism that can independently adjust the tilt adjustment in the azimuth direction of the head and in the direction orthogonal to the recording track. The purpose is to

Structure of the Invention In the present invention, a first substrate holding a head is pivotably supported at two points, and is rotatable about an axis connecting the two points, and one of the two pivot points is pivotably supported at two points. The height can be adjusted with respect to one other point, and the rotation of the shaft connecting the two points above corresponds to the azimuth displacement of the head, and the height adjustment of the pivot point is in the direction of the recording track of the head. The present invention is characterized by a head adjustment mechanism in a recording/reproducing apparatus that performs tilt adjustment between orthogonal directions.゛In the description of the embodiment of the head adjustment mechanism in the recording and reproducing apparatus of the present invention, the case of a magnetic disk type recording and reproducing apparatus is explained.
The present invention is not limited to this, and can be applied to optical and electrostatic types, and can also be applied to magnetic tape recording and reproducing devices that use magnetic tape. Further, in the embodiment, a video signal recording and reproducing device is described, but it goes without saying that this may be a device that handles data, such as a floppy disk device.

Description of Examples (Figures 1 to 9) In the following, the present invention will be explained in detail.

FIG. 1(-) shows a plan view of the cassette, and FIG. 1(b) shows a sectional view thereof. In Fig. 1 (-), 1 is a magnetic disk, 2 is a cassette formed into a flat box-like body made of resin, etc., and inside this cassette 2 there are 16 disks.
is stored. A hub 3 is fixed to the center of the magnetic disk 1, and a spindle 8 coaxially attached to the shaft of a disk motor 7 shown in FIG. 4, which will be described later, is inserted into a center hole 3a provided in the hub 3. . Therefore, the magnetic disk 1 and the knob 3 are rotated as one unit by the rotational drive of the disk motor 7.

A counter 40 is rotatably supported by a part of the housing of the cassette 2 and is locked by a click mechanism (not shown), which indicates how many recording tracks can be recorded on the magnetic disk 1. This indicates the number of tracks remaining or the number of recorded tracks. 4
0a is a hole Jt into which a slider 45 shown in FIGS. 7 and 8, which will be described later, is inserted to drive the counter 40 in steps;
4ob is a keyway into which a key 451) shown in FIG. 7, which will be described later, is inserted into the counter hole 0a, and also functions as a pointer to indicate the number of recorded tracks on the magnetic disk 1. . For example, if the maximum number of recordable tracks on the magnetic disk 1 is 50, the counter 40 has a click mechanism (not shown) having more than 50 click points within a range of 360'' or less.
If the first track is the outermost track and the 50th track is the innermost track, then the amount of movement of the magnetic head carrier 20 holding the magnetic head 6 shown in FIG. 5, which will be described later, to each recording track position is In one-to-one correspondence, the counter 40
The number of recorded tracks is counted by the counter 40.
It can be read from. In Figure 1 (1) l,
The cassette 2 is provided with openings 2a and 2b on the surface facing the magnetic head 6 and the opposite surface thereof, and covers the magnetic disk 1 except for these openings 2a and 2b. The cassette 2 containing the magnetic disk 1 has an opening 2a.
The magnetic head 6 is mounted on a support mechanism (not shown) so that the magnetic surface of the magnetic disk 1 and the magnetic head 6 face each other via a support mechanism (not shown). A magnetic disk 1 is rotated at an integral multiple of the field frequency of a standard TV signal by a disk motor 7 shown in FIG. 4, which will be described later.
A still image is recorded by concentrically forming a TV signal as annular tracks for an integer multiple of fields. In an embodiment of the invention, the standard TV signal is, for example, NTSC! Therefore, the field frequency is 6.
Q11z, magnetic disk 10 rotation speed is 5.600rp
m, and one field is recorded on one track.

FIG. 2 shows a plan view of the magnetic disk drive seen from the direction opposite to the loading direction of the cassette 2, in which 4 is the main body chassis, 5 is a stepping motor that drives the magnetic head 6, and the cassette 2 is Indicated by the dotted chain line.

FIG. 3(a) shows a perspective view of the magnetic disk device shown in FIG. 2, viewed from the back side. In the figure, 4 is a main body chassis, 5 is a stepping motor, and 7 is a disk motor. 2o is a magnetic head carrier that supports the electro-mechanical transducer 11 to which the magnetic head 6 shown in FIG. A guide shaft 26 is fitted into the portion 2ob) and is supported slidably in the axial direction. Both ends of the guide shaft 26 are pressed and fixed to a shaft fixing portion 28 integrally molded with the main body chassis 4 by shaft fixing plate springs 27 . Reference numeral 25 denotes a clamper shown in detail in FIG. 5, which will be described later, which fixes and holds an engaging pin 23 that engages with a screw shaft 29 to the magnetic head carrier 20. Then, the rotation of the screw shaft 29 is applied to the magnetic head carrier 201C via the retaining pin 25, and the magnetic head carrier 20 is transferred to the guide shaft 201C.
6 and move it in the axial direction. Reference numeral 54 denotes a bias spring which is a tension coil spring, one end of which is attached to the spring hook pin 33, and the other end is attached to the spring hook portion 4 shown in FIG. 6, which will be described later.
The cylindrical part 201 of the magnetic head carrier 20 is
), and a spring biasing force shown by arrow C is applied. Arm portion 20C of magnetic head carrier 20
A rectangular leaf spring 35 is fixed to the end of the spring 35 with a screw 36.

Both ends of the guide shaft 68 that come into contact with the leaf spring 35 are pressed and fixed by the shaft fixing portion 37' integrally molded with the main body chassis 4 by the shaft fixing leaf spring 37. The leaf spring 55 rotates the magnetic head carrier 20 clockwise or counterclockwise about the guide shaft 26 by adjusting the adjustment screw 39 shown in FIG. 6, which will be described later.
The magnetic head (not shown) supported at 0 can be adjusted to be displaced in the direction of protrusion or retraction with respect to the magnetic disk. 32 is a flexible shaft joint, the screw shaft 29 is rotatably supported by a bearing 30, and the bearing 30 is fixed to the main wooden chassis 4 by a fixing plate spring 31. Reference numeral 58 denotes a drive cap stand, which is fixed to one end of the screw shaft 29 by a set screw 59. A wire 6o is fixed at one end to the drive cap stun 58 and at the other end to a groove 43a in the drive cap 43 shown in FIGS. A spring hook 61 is implanted in another groove portion 431) of the drive reel 43, and between this spring hook 61 and the spring hook 63 implanted in the main body 7 palm 4, the groove portion 43b of the drive reel 43 is A counter spring 62 is mounted via the counter spring 62.

This counter spring 62 connects the wire 6 to the drive reel 43.
The purpose of this is to apply rotational bias in the opposite direction to the rotational direction caused by zero. The stepwise rotation of the stepping motor 50 causes the drive cap stan 58 to rotate via the deflection [1iII joint 32 and the screw shaft 29, winding the wire 60,
The drive reel 43 is fed and the counter 40 is given incremental rotation. The rotation of the screw shaft 29 is applied to the retaining pin 25 that meshes with the screw shaft 29, and the rotation of the screw shaft 29 is applied to the retaining pin 25 which is engaged with the screw shaft 29, and the axial direction feed is given to the magnetic head carrier 20 step by step. can provide a radial feed of

51 is a solenoid fixed to the main body chassis 4,
52 is integrally attached to a lever 53 by its iron core, and one end of the lever 53 is rotatably coupled to a bell crank 55 by a shaft 54. The shaft 56 is a bell crank 55
It is the center of rotation. Projection 5 of bell crank 55
5a is in contact with an arm portion 47a of a clutch lever 47 shown in FIG. 8, which will be described later, and a pin 49 is provided at one end of this lever 47. When the solenoid 51 is excited to attract the iron core 52, the lever 53 is attracted in the direction of the arrow, the bell crank 55 rotates clockwise about the shaft 56, and the tip of the clutch lever 47 i? By pushing down J47a, the pin 49 is moved upward with respect to the main body chassis 4 as shown in FIG. 3(a), and the drive reel 43 is moved upward, as shown in FIGS. 7 and 8 described later. The lock on the counter 40 is released, and the step rotation of the stepping motor is not transmitted to the counter 40. In this state, the movable contact piece 50 is attached to one end 47a of the clutch lever 47.
and the fixed contact piece 50' come into contact with each other.

In FIG. 3(a) explained above, the case where the stepping motor 5 and the screw shaft 29 are arranged coaxially has been explained, but as shown in FIG. 3(b), the screw shaft 29
It is also possible to arrange the stepping motor 5 in a direction perpendicular to the direction. In FIG. 3(b), the main body chassis 4
A stepping motor 5 is mounted on a wall constructed by cutting out
is fixed so as to be orthogonal to the screw shaft 29. 301
is a rotating shaft of a stepping motor, and a worm gear 302 is attached to the tip thereof, which engages with a worm wheel 303 attached to one end of the screw shaft 29. 31 is the same fixing leaf spring as shown in FIG. 3 (-1), and fixes the bearing of the screw shaft 29 (30 in FIG. 29 is given a rotational torque in the direction of the arrow by the return spring 62 to the drive reel 43 in FIG.
It is possible to eliminate the backlash between the magnetic head 6 and the magnetic head 6, making it possible to move the magnetic head 6 with high accuracy.

FIG. 4 shows a section A of the magnetic disk device shown in FIG.
-A side sectional view seen from A is shown. In FIG. 4, 1 is a magnetic disk and 2 is a cassette. A spindle 8 fixed to the shaft of a disk motor 7 is fitted into a center hole 3a of a hub B provided integrally with the center of the magnetic disk 1. A ring-shaped adsorption plate 9 made of a soft magnetic material such as iron is attached to the lower part of the hub 6, and the attraction force between this adsorption plate 9 and a ring-shaped magnet 10 fixed to the groove of the spindle 8 Therefore, the height reference surface 3b of the hub 3 is brought into contact with the reference surface 8a of the spindle 8. The hub 3 and spindle 8 are driven by a disk motor 7 and rotated as one unit. Reference numeral 12 supports at its fixed end an electro-mechanical transducer 11 (hereinafter simply referred to as bimorph) consisting of a pair of rectangular plate-shaped piezoelectric bodies shown in FIG. 5, which will be described later, with a magnetic head 6 attached to its free end. This bimorph support member 12 is provided with two positioning holes 12e and 12f.

Reference numeral 14 denotes a substantially L-shaped mounting member to which the bimorph support member 12 is mounted, and this mounting member 14 is provided with a positioning conical pin 15 and an adjusting conical screw 16. The positioning conical pin 15 is fixed to the mounting member 14, and the adjusting conical screw 16 can be moved forward and backward so that the biting of the screw can be adjusted by screw connection. The positioning conical pin 15 and the adjusting conical screw 16 are connected to the positioning and determining holes 128 and 12 of the bimorph support member 12 on the inclined surface of the conical end thereof.
Since f is engaged, by adjusting the conical screw 16, the conical pin 15 can be used as a pivot point, and the position of the recording head 6 can be adjusted in a direction perpendicular to the recording track.

Positioning conical pin 15 of the L-shaped mounting member 14 described above
2 on a surface different from the surface on which the conical adjustment screw 16 is disposed.
There are several positioning holes 14a. Two conical positioning pins 210 and conical slopes are engaged with this positioning hole 14a.

24 is a pressure spring, 23 is a set screw, and this and adjustment screw 22 are used to attach the mounting member 1 to the magnetic head carrier 20.
4 can be pivotally supported so that the position can be adjusted.

FIG. 5(a) is a perspective view showing details of the magnetic head carrier. The magnetic head carrier 20 that supports the magnetic head 6 in the figure will be explained with reference to the bimorph support member 12 shown in FIG. 5(b) and its side sectional view shown in FIG. 5(C). .

The magnetic head 6 is fixed to the free end of the bimorph 11. This bimorph 11 deforms due to its piezoelectric effect, and when the recorded magnetic disk is reproduced, the head 6
This is used as a means for correcting track deviation. As shown in FIG. 5(b), the bimorph 11 is provided with a U-shaped notch 11a on the side opposite to the side supporting the magnetic head 6. 12 is a bimorph support member, and as shown in FIG. 5(C), a groove portion 12a slightly wider than the thickness button of the bimorph 11 is provided in a part of the bimorph support member 12. A screw hole 1'2b is coaxially provided on one side of the portion sandwiching the groove 12a, and a hole 120 slightly larger in diameter than the screw hole 12 is provided on the other side. The bimorph 11 is inserted into the groove 12a of the bimorph support member 12 so that the center of the U-shaped notch 11a almost coincides with the centers of the screw hole 12b and the hole 120, as shown in FIG. 5(a). By fastening the screws 13, the projecting portion 12 of the bimorph support member 12
By deforming d toward the screw hole 121), one end of the bimorph 11 is clamped and supported. The mounting member 14 to which the bimorph support member 12 is attached is formed in a substantially L-shape, and the positioning conical pin 15 is inserted into two positioning holes 12e and 12f provided in the bimorph support member 12 as shown in FIG. and an adjustment conical screw 16 are provided,
It is fixed to a positioning conical bottle 15 mounting member 14, and an adjusting conical screw 16 is screwed together, so that the adjusting conical screw 16 can be moved forward and backward by screwing adjustment. Figure 5 (b
) The bimorph support member 12 is inserted through the screw insertion holes 12g and 12h provided in the bimorph support member 12 as shown in FIG.
is attached to the attachment member 14. At this time, attaching screw 1
7 is pressed by the suppression spring 19.
(in the direction of the mounting member 14). Then, when the azimuth adjustment screw 18 is rotated, the conical tip portions of the conical positioning pin 15 and the conical adjustment screw 16, also referring to FIG. Since the slope engages with the positioning hole 129.12f of the bimorph support member 12, it is urged to rotate in the direction of arrow A shown in FIG. 5(a) using the two conical portions as pivot points, and the mounting member The rotation of the azimuth adjustment screw 1B is prevented by the collar of the azimuth adjustment screw 1B screwed to the azimuth adjustment screw 14. Therefore, by rotating the azimuth adjustment screw 1B, the deflection in the direction of the arrow shown in FIG. 5(a), That is, fine adjustment in the azimuth adjustment direction is possible.

Also, by rotating the adjusting conical screw 16 shown in FIG. can do.

Furthermore, as shown in FIG. 4, two positioning holes 141L are provided on the side of the L-shaped mounting member 14 that is different from the side on which the positioning conical pin 15 and the adjusting conical screw 16 are disposed. The mounting member 14 corresponds to the positioning hole 14a.
is provided, and two positioning conical pins 21 are installed in the head mounting member 20a of the 7IC magnetic head carrier 20,
A positioning conical pin 2 is inserted into the positioning hole 14a of the mounting member 14.
10 is engaged with the magnetic head by the set screw 25 via the adjustment screw 22 and the pressing strip 1 tongue 24, as shown in FIG. 6, which will be described later.

Attach to carrier 20. Then, similarly to the azimuth adjustment described above, the mounting member 14 is moved to the sixth position with the positioning conical pin 21 as the pivot point due to the urging force of the pressing bolt 24.
As shown in the figure, the adjustment screw 2 is biased to rotate counterclockwise as shown in the figure.
Rotation is prevented by the flange 2. Therefore, adjustment screw 2
2, in the direction of arrow A in FIG.
You can adjust the tilt in the recording track direction.

To summarize the adjustment of the magnetic head described above, (1) By finely adjusting the adjustment screw 22, the mounting member 14 uses the positioning conical pin 21 as a pivot point, and the magnetic head 6
This can be achieved by adjusting the tilt of the magnetic disk 1 in the track direction (FIG. 6).

(2) As shown in FIGS. 4 and 6, the mounting member 14 can be adjusted by finely adjusting the adjusting screw 16 fitted into the mounting member 14.
The positioning conical bottle 15 provided in is used as a pivot point,
It is possible to provide tilt adjustment in a direction perpendicular to the magnetic track 1.

(3) As shown in FIG. 5(a), by finely adjusting the azimuth adjustment screw 18 provided on the bimorph support member 12 that supports the bimorph 11 together with the magnetic head 6, the positioning conical pin 15 and the adjusting cone Positioning holes 12θ and 12 provided in the bimorph support member 12 with which the screw 16 engages
Using f as a pivot point, fine adjustment can be made in the direction of the arrow shown in FIG. 5(a), that is, in the azimuth direction.

In order to perform each of the above-mentioned adjustments well, the conical pin 15 and adjustment screw 16 must be placed on a perpendicular line passing through the magnetic head 6 in FIG. 6, as shown in FIG. To, again.

The mounting screw 17 and the adjusting screw 18 are arranged so that they lie on a horizontal line in FIG. It is best to position it on a line that is perpendicular to the line and also perpendicular to the plane on which the conical pin 15 and adjustment screw 16 of the mounting member 14 are disposed, but of course it is not limited to this. It's nothing.

Next, to describe the configuration and operation of the magnetic head carrier 20, as shown in FIG. The sintered bearings 22 are press-fitted from both ends of the cylindrical portion 20b in a coaxial direction. Projections 2oa are provided at two locations on the side surface of the cylindrical portion 20b, and as explained in FIG. 20a, it is provided so as to correspond to the advance angle of the screw shaft 29 and to be inclined at a predetermined angle with respect to the axes of the two sintered bearings 22.

25 is a clamper, its shape is almost U-shaped,
Two hooks 25a are provided, and two protrusions 25b are formed on the U-shaped inner wall so as to face each other. This clamper 25
A tap hole 25 (l) is provided at approximately the center of the arm portion 25Q that is connected to the U-shaped portion. A clamper retaining hole 2Of is provided at a vertically symmetrical position in the cylindrical portion 20b.

The bending inner width of the U-shaped portion of the clamper 25 is set to be approximately equal to the outer diameter of the cylindrical portion 20b, and the U-shaped portion of the clamper 25 is slightly expanded against the elasticity of the clamper 25.
The two protrusions 25b provided on the inner wall of the U-shaped portion are pushed in until they are inserted into the clamper coupling holes 2of provided on the upper and lower surfaces of the cylindrical portion 201). When the protrusion 25b is inserted into the clamper retaining hole 2Of, it returns to its original shape due to the elastic force of the clamper 25, thereby allowing the clamper 25 to freely rotate around the clamper retaining hole 2Of. Supported by 2o.

Next, attach the engagement pin 23 to the groove 20e, and insert and tighten the clamp screw 25f into the tap hole 25d of the clamper 25. Due to the reaction force caused by this, the clamper 25 is rotated counterclockwise around the clamper engaging hole 2Of, and as a result, the clamper 25 is rotated counterclockwise around the clamper engaging hole 2Of. As shown in detail, by pressing the engagement pin 25 against a surface perpendicular to the groove 209, the engagement pin 23 is fixedly supported on the cylindrical portion 201).

In this case, by pressing the retaining pin 25, the hook portion 2
Since the reaction force that 5a receives is received in the direction of the plate surface of the clamper 25, the clamper 25 exhibits high rigidity in the direction of the plate surface, and therefore its deformation is small and elastic deformation of the arm portion 250 of the clamper 25 in the plate thickness direction is reduced. As a result, a pressing force is generated on the locking bottle 23, and the locking bottle 23 can be held. The reaction force at the pressing part of the clamper 25 against the engagement pin 23 is received in the surface direction of the plate material, resulting in high rigidity and little deformation, and the clamping pressure is received by elastic deformation in the bending direction of the plate material, so pressure management is possible. In addition to the advantage of being easy to carry out, the engagement point between the engagement pin 23 and the screw shaft 29 is set near the guide shaft 26 by increasing the thickness of the magnetic head carrier in the thickness direction of the device by the thickness of the plate. There are advantages that can be achieved.

FIG. 6 is a side sectional view of the magnetic disk device of FIG. 2 taken along the line B-B. In FIG. 6, 1 is a magnetic disk, 2 is a cassette, 4 is a main body chassis, and 6 is a magnetic head. One end of a biasing spring 34, which is a tension coil spring, is fixed to a spring hook pin 56 implanted in the magnetic head carrier 20, and the other end of this spring 54 is fixed to a spring hook provided on the main body chassis 4. It is latched to the hanging part 4a. When this spring 64 is stretched between the spring 4t, the 1-bin 33, and the spring hook 4a, it is wound helically around the cylindrical outer wall of the cylindrical portion 2Gtl of the magnetic head carrier 20, so that it forms a cylindrical shape as shown in FIG. A spring biasing force shown in the direction of arrow C is applied to the portion 20blC, and a rotational moment about the guide shaft 26 is applied and observed in the direction shown by arrow C in FIG. This generates a radial bias force on the magnetic head carrier 20 with respect to the guide shaft 26 at the abdomen of the spring 34, thereby providing the magnetic head carrier 20 with the effect of preventing shaft vibration. Note that although there is a radial gap of approximately several μm between the guide shafts 26 and 38, this gap can be absorbed by the biasing force described above.

A rectangular plate spring 35 is fixed to the arm portion 20c of the magnetic head carrier 20 with a screw 3B.

A protrusion 37 made of a high friction material is implanted in the leaf spring 65. This protrusion 37 is in contact with a guide shaft 68 fixed to the main body chassis 4 with a rotational moment, just as the guide shaft 26 is given a rotational moment in the direction of arrow C. The urging force of the magnetic head carrier 20 in the direction shown by the arrow C generated by the biasing spring 34 prevents backlash at the meshing portion between the locking pin 23 and the screw shaft 29 shown in FIGS. 6 and 5. Can be removed.

In short, the magnetic head carrier 20 has a guide shaft 26T.
/C, its sliding direction is uniquely determined, and rotation around the guide shaft 260 is regulated by the guide shaft 3B.

A screw hole into which the adjustment screw 69 is inserted is provided in the mounting portion of the leaf spring 35 provided on the arm portion 20c of the magnetic head carrier 20, and the adjustment screw is inserted in the advancing direction of the adjustment screw 39 against the elastic force of the leaf spring 65. When 39 is tightened, the leaf spring 35 deforms downward relative to the magnetic head carrier 20. The magnetic head carrier 20 rotates clockwise about the guide shaft 26 in response to a reaction force due to its deformation. Accordingly, the magnetic head 6 moves in the direction of the magnetic disk 1, that is, in the protruding direction. When the adjustment screw 39 is loosened, the magnetic head 6 moves rearward with respect to the magnetic disk 1, that is, in the retracting direction. That is, by adjusting the adjustment screw 39, the position of the magnetic head 6 can be adjusted in the direction of protrusion or retraction with respect to the magnetic disk 1. In this case, the guide shaft 26 is also subjected to rotational torque, but the actual magnetic head protrusion adjustment amount is around 20 μm, and the distance a, which is the length of the arm 200 of the magnetic head carrier 20, is 20 μm. Since it is both front and back, the angle of inclination is less than a few minutes, which is virtually no problem.

7 and 8 show a side sectional view and a side view of the counter as seen from the a-C cross section and D of the magnetic disk drive shown in FIG. 2, respectively.

In Figure 7, 41 is a shaft implanted and fixed to a counter shaft 42 that is integrally attached to the main body chassis 4),
A driving reel 43 is rotatably supported around the shaft 41, and a locking ring 44 attached to the shaft 41 prevents the shaft 41 from sliding in the thrust direction. 45
is a slider, which is rotated by the rotation of the drive reel 45, and is rotated by the eighth slider, which will be described later, in the thrust direction of the shaft 41.
It is pivotally supported to be slidable by the vertical movement of the bin 49 shown in the figure. The slider 45 is provided with a protrusion 45c that protrudes in the driving direction H45, and is fitted into a retaining hole (not shown) provided in the driving reel 43 so as to be slidable in the thrust direction.
The slider 45 rotates together with the rotation of the drive reel 43. The slider 45 has a groove 45a into which a bottle 49 shown in FIG.
) is provided with a key 45b that is inserted and fitted into the key groove 40t) of the counter 40 shown in FIG. A cap 46 is press-fitted onto the shaft 41 as a stopper for the slider 45 in the thrust direction.

In FIG. 8, a clutch lever 47 is rotatably supported on a lever shaft 48 fixed to the main body chassis 4 shown in FIG.

Note that the clutch lever 47 is provided with a spring 48'.
A rotational moment shown in the arrow direction A is applied to the clutch lever 47. A pin 49 is installed at the other end of the clutch lever 47, and this pin 49 is inserted into the groove 4 of the slider 45.
5a. The clutch lever 47 is connected to the pin 49
An arm portion 47a is provided on the side opposite to the side where the arm portion 47a is implanted. To explain with reference to FIG. 3 (-), 51 is a solenoid, 52 is an iron core of the solenoid 51, and 53 is an iron core 52.
This is a lever that connects the bell crank 55 and the bell crank 55. A shaft 54 rotatably supports the lever 53 on a bell crank 55. 56 is a shaft that fixes the center of rotation of the bell crank 550 relatively to the main body chassis 4. When the clutch lever 47 is rotated clockwise or counterclockwise about the shaft 48, one end of the clutch lever 47a engages the slider 45.
is the key 451 for the keyway 40b4C of the counter 40)
is inserted or removed. As shown in FIG. 3(a), the protrusion 55& of the bell crank 55 is connected to the clutch lever 4.
When the solenoid 51 is excited, the iron core 52 is attracted in the direction of the arrow, and the lever 53
both move in the same direction, thereby causing the bell crank 55 to rotate clockwise. Due to the rotation of the bell crank 55,
The bell crank protrusion 55a pushes one end 47a of the clutch lever 47, and the clutch lever 47 shown in FIG. move it. In this state, even if the slider 45 rotates, the rotation of the slider 450 is not transmitted to the counter 40 because the key 45t) is disengaged from the keyway 40b of the counter 40.

Therefore, the counter 40 can hold an indication of the number of tracks recorded on the magnetic disk 1 so far. Then, the contact piece 50 and the contact piece 50' come into contact to form an electrically conductive state, thereby providing a write inhibit mode to the circuit device of the magnetic recording/reproducing apparatus (not shown).

Note that 57 is made of an insulating material and connects the sections 50 and 50'.

When the solenoid 51 is in a de-energized state, the shift latch lever 47 is biased by the elastic force of the spring 48' in the direction of the arrow in FIG. and slider 45 key 451)
When the phases match, the slider 45 is raised and its key 451) is inserted into the keyway 40b. As a result, the section 50 and the fixed section 50' are separated and electrical continuity is broken.

Therefore, if you remove a cassette containing a partially recorded magnetic disk and then load the cassette to continue recording, the counter 40 provided on the cassette will calculate the maximum number of recorded tracks. Since the value of the maximum track number of the recorded recording tracks is still held, the value of the maximum track number of the recorded recording tracks is calculated by dividing the value of the section 50 and the fixed section 50 generated by inserting the key 451) into the keyway 40b.
It is possible to detect the opening of a switch consisting of . Therefore, since it is possible to continue recording from the track immediately following the largest recorded track, overwriting on the recorded track is prevented.

During playback, all recording tracks are generally accessed randomly, so in such a case, the key 45b of the slider 45 and the keyway 40 of the counter 40
The key 45b is in the keyway 40b when the phase matches with the
[If the slider 45 is inserted, the rotation of the slider 45 will be applied to the counter 40, and the counter 40, which was indicating the maximum number of recorded tracks on the magnetic disk 1 on which magnetic recording was performed before reproduction, will increment. As a result, the value of the maximum number of recorded tracks recorded on the magnetic disk 1 may become unknown.

Therefore, during playback, the solenoid 51 is energized and the key 45b of the slider 45 is moved to the keyway 401 of the counter 4°.
If K is retracted from K, the rotation of the slider 45 will not be applied to the counter 4o. Therefore, the counter 4o can hold the value of the maximum number of tracks recorded on the magnetic disk 1.

Next, driving of the counter 40 and adjustment of the track designated position of the magnetic head and the counter 40 on the recording track will be explained with reference to FIGS. 3 and 8.

In FIG. 3(a), the drive cap stan 58 is fixed to one end of the screw shaft 29 with a set screw 59,
It is configured to rotate together with the screw 1l129. The end of the wire 60 wound around the cap stan 5B is fixed to the groove 45a of the reel 43 shown in FIG.
Only the required amount is wound. Other grooves 45 of drive reel 43
A spring hook 61 is installed in b, and a counter spring 62 is mounted on this spring hook 61 so as to be wound around the groove 43b of the slider 43, and the counter spring hook is stopped. Therefore, the driving reel 43 is biased clockwise by the Δ counter spring 62, and the wire 6o is stretched against this biasing force.

Here, if the respective diameters of the drive cap stun 58 and the drive reel 43 are appropriately selected, the rotation angle of the stepping motor 5, that is, the track of the magnetic head 6 corresponds to a predetermined angle of a counter click mechanism (not shown). The counter 40 can be driven in one-to-one correspondence with the paper feed.

Further, the position of the magnetic head 6 on the first recording track on the magnetic disk 1 and the indicated position of the force counter 40 indicating the first recording track can be adjusted by rotating the stepping motor 5. Position the magnetic head 6 on the th recording track, then loosen the set screw 59 in this state, rotate the drive cap stand 58 relative to the screw shaft 29, rotate the drive reel 43, and move the slider 45. The phase of the counter can be adjusted by adjusting the key 45b so that the counter 40 accurately indicates the value of the first recording track.

FIG. 9 shows that when the magnetic head 6 is reset, it is fed one step at a time until it is reset to a predetermined reference position, for example, a position shifted outward by one track pitch from the first recording track of the magnetic disk 1. A control system configured to transfer one track pitch in four steps in normal recording or reproducing operation after being reset to the reference position, and a circuit for activating or inactivating the counter 40 are shown. .

In the figure, 104 is a recording switch, 102 is a playback switch, and 103 is a mode setting circuit.

The mode #1 mode setting circuit 103 includes switches 101 and 102.
In response to each operation, only Hirodeka Re in recording mode,
In the playback mode, only the output RP is set to the crystal level, and the output of these outputs is controlled by AND gate 1 for recording operation control.
o4 and the AND gate 109 for controlling the playback operation, together with an enable signal generated when the A=BJ output of the comparison circuit 114, which will be described later, becomes a high level. When the shown contacts 50 and 50' are open, a high level signal is applied to control the recording signal processing circuit 130 and the reproduction signal processing circuit 131, respectively.

105 is a track designation for designating a desired track;
It is configured with a switch, for example a numeric keypad. 106
107 is a register that stores data n related to the track address designated by the track designation switch 105, and 107 displays the designated track address stored in the register 106, the setting mode (recording or playback) of the device, and the recording prohibited state in the recording mode. It is a display device for For this purpose, in addition to the output of the register 106, the display device 107 includes an inverter 122 that inverts the outputs RO and RP of the mode setting answer 105 and the output of the AND gate 104.
The output of is given.

The display device 107 is preferably a small display using liquid crystal, electrochromic, light emitting diode, or the like. 10
Reference numeral 8 denotes a data conversion table made of, for example, a ROM, which outputs 4D in this example as head position setting data. Here, 4n is data n representing a track designated by the designation switch 105 (for example, converted into digital data using a binary code)), and data n representing a track designated by the head transport stepping motor 5 (FIG. 3) per track pitch. This is recording head position 11 setting data with a numerical value commensurate with the 4-step head feed.

113 is an up/down counter (hereinafter abbreviated as U/D counter) for detecting the moving position of the magnetic head 6 by the stepping motor 5; 114 is an output of the data conversion table 108 (referred to as A) and U/D counter; D counter 11
This is a comparison circuit that compares the output of No. 5 (denoted as B), and depending on the output person and the size of B, @A')B", "A=B
115 is a pulse generator, and the stepping motor 5 is driven based on the stepping pulse output from the pulse generator.Hereinafter, one stepping pulse will be described. The explanation will be made assuming that one step is sent.1
16 is a control circuit that controls the operation of the motor 5 based on the outputs of the comparison circuit 114 and the pulse generator 115; The motor 5 is rotated in the normal direction, the motor 5 is rotated in the reverse direction in response to the high level of 'A(B'), and the supply of pulses to the drive circuit 117 is cut off in response to the high level of 'A=B', and the motor 5 is rotated. It has a function to stop the control circuit 116.
outputs a rotational direction designation signal that specifies forward or reverse rotation of the motor 5 and a pulse for rotational drive, and this rotational direction designation signal commands, for example, forward rotation when it is at a high level, and reverse rotation when it is at a low level. do. 117 is a motor drive circuit that rotates the motor 5 by a specified amount in a specified direction based on the output of the control circuit 116; 118 is a circuit that connects the "A (B") output of the comparison circuit 114 with the output of the reset circuit 127, which will be described later; An OR gate as an input, the output of which is the control circuit 11.
Connected to the reverse input of 6.

Here, it is assumed that the magnetic head 6 moves in the direction in which the track address increases when the motor 5 is rotated in the normal direction, and in the direction in which it decreases when the motor 5 rotates in the reverse direction.

The rotation direction designation signal and pulse output from the control circuit 116 are given to the U/D counter 113 as a count mode setting signal and a count pulse, respectively. In this case, the U/D counter 113 is set to the rear count mode by the high level of the rotation direction designation signal, that is, a forward rotation command, and to the side run count mode by the low level of the rotation direction designation signal, that is, a reverse rotation command. Ru.

119 is a comparison circuit 1140''A (startup synchronized RS flip 70 block, which is set by the high level of the B'' output and reset by the high level of the ``M'':>B''output;
20 is the Q output of this flip-flop 119, the output RC of the mode setting circuit 1o3, and the reset circuit 12.
The OR gate that receives the output of 7, 121 is the OR gate 1
In response to the output of 20, the solenoid 5 of FIGS. 3(a) and 8
This is a solenoid drive circuit that excites 1. 133 is a recording start (trigger) switch, 134 is a recording start switch 1
33 and an AND gate 134, which outputs the signal to the output recording signal processing circuit 130 as a control signal.

124 is a power supply, 125 is a power switch, and when the power switch 125 is turned on, a pulse generator 115, a control circuit 116, a drive circuit 117, an OR gate 118 and 12 are connected.
0, Fugutsubu flop 119, solenoid drive circuit 12
1. Reference position detection device 12 for the stepping motor 5 and the magnetic head 6 (generally a transducer)
6 and a reset circuit 127 are connected to the power supply 124.

Furthermore, the disk motor (No. 5 (al, 7 in Figure 4.6) is also
Along with this, the power supply 124 can be connected to the iC. When the magnetic head 6 is sent toward the reference position and the reference position is detected, the reference position detection device 126 generates a reference position detection completion signal, which is sent to the reset circuit 127 . The reset circuit 127 resets the magnetic head 6 to a reference position t outside the first track of the magnetic disk (1 in FIG. 1).
A reset signal for moving is continued to be supplied to the control circuit 116 via the OR gate 118 until the reference position is detected. In response to this reset signal, the control circuit 716 outputs a rotation direction designation signal and pulses for rotating the motor 5 in the reverse direction until the reset signal is released.

When the magnetic head 6 is reset to the reference position and the reset signal of the reset circuit 127 is released, the output of the inverter 127' becomes high level, which closes the switch path 128 and closes the switch 1250. It is connected to a stain source 124 .

At the same time, the power-up clear circuit 129 operates,
A power-up clear pulse (PU
O) is given and these circuits are cleared or reset.

130 is a recording signal processing circuit for supplying the video signal to the magnetic head 6 and recording it on the magnetic disk 1; 151 is a reproduction signal processing circuit for reproducing the signal picked up by the magnetic head 6; As described above, they are controlled by corresponding AND gates 121 and 122, respectively. Reference numeral 132 indicates a display device for displaying the reproduced signal, but the reproduced signal can also be connected to an output device such as a printer.

When the power switch 125 is turned on, the pulse generation lenoid drive circuit 121, the reference position detection device 126, the reset circuit 127, the stepping motor 5 and, if necessary, the disk motor 7 are connected to the power supply 124 iC, and the reset circuit is turned on. A reset signal is supplied to the control circuit 116 via the OR gate 118 until the magnetic head 6 reaches the reference position. Due to this, the control circuit 11
6 is a drive circuit 117 that sets the rotation direction designation signal to a low level.
At the same time, the pulse generator 115 outputs a pulse for motor stepping from the pulse generator 115. As a result, the drive circuit 117 reverses the motor 5, and the magnetic head 6
If it is not at the reference position, it is moved until it reaches the reference position. During this time, the output of the OR gate 120 becomes high level in response to the reset signal from the reset circuit 127, so the solenoid drive circuit 121 operates and excites the solenoid 51. It will spin idly in a state where it is detached from the counter 40 on the second side.

Then, when the magnetic head 6 reaches the reference position, the reference position detection device 126 detects this and its output drops to a low level, so the reset circuit 127 stops supplying the reset signal to the control circuit 116, and the motor 5 will also stop at that position. Additionally, since the output of the geoagate 120 becomes low level, the solenoid drive circuit 121 cuts off the excitation of the solenoid 51, and the slider 45 is therefore biased in the direction of engagement with the counter 40 by the clutch lever 47. becomes. However, in this state, the slider 45
The key 45b is not in phase with the keyway 40b of the counter 40, and therefore the two have not yet been engaged.

When the reset signal from the reset circuit 127 becomes low level, the output of the inverter 127' becomes high level, and the switch circuit 128 is activated, and all circuits other than those connected to the power supply 124 when the power switch 125 is turned on are activated. is connected to power supply 124.

At the same time, the power-up clear circuit 129 operates, and its output power-up clear pulse is sent to the mode setting circuit 104, the register 106, and the U/D counter 11.
3, etc., these circuits are cleared or reset, and therefore track address zero is displayed on the display device 107.

In this state, record switch 101 or playback switch 10
2 and designate a desired track address using the track designation switch 105, the track address data n is stored in the register 106, and the display device 107 displays the mode of the device and the designated track address. . Then, data 4n is output from the data conversion table 108 and applied to input A of the comparison circuit 114. On the other hand, the output of the U/J) counter 116 is given to the input B of the comparison circuit 114, but at this time ≠ the output of the counter 115 is zero, so the l A >B'' output of the comparison circuit 114 is at a high level. The multi-control circuit 116 sets the rotation direction designation signal to a high level to instruct the motor 5 to rotate forward, and outputs a motor stepping pulse from the pulse generator 115.As a result, the drive circuit 117 causes the motor 5 to rotate forward. is rotated in the normal direction, and the magnetic head 6 is moved from the reference position toward the designated track number n.Meanwhile, at this time, the control circuit 1
The Uρ counter 113 operates in an up-count mode in response to a motor forward rotation command from the magnetic head 16, and counts monitor pulses corresponding to the step feed of the magnetic head 6.

When the magnetic head 6 reaches the track position of address n, at this point the count output of the U/[) counter 113 becomes 4n.
Therefore, the comparator circuit 114 is outputting "' A=
13'' becomes a high level.The multi-control circuit 116 then stops outputting the motor stepping pulse, so the motor 5 stops and the magnetic head 6 stops at the track position of address n.

Here, the operation during reproduction and the operation during recording will be explained.

(Operation during playback) When the playback mode is specified by operating the playback switch 102, the output RP of the mode setting circuit 103 is maintained at a high level, so the output of the OR gate 120 is maintained at a high level. The solenoid drive circuit 121 buzzes to keep the solenoid 51 in an excited state during the regeneration operation.Therefore, during the regeneration operation, the switcher 45 moves the cassette 2
The counter 40 is maintained in a detached state, and the counter 40 does not increment at all.

Through the above-described operation, the head 6 reaches the track position designated by the track designation switch 105, and the "A=E" output of the comparator circuit 114 becomes high level, causing the head 6 to stop at that position. At this time, the output of the encoder 109 becomes high level, which causes the reproduction signal processing circuit 131 to operate and the reproduced image to be displayed on the display device 132.

Incidentally, in order to move the magnetic head 6 to the track position n' after the reproduction at the track position n is completed, the track designation switch 105 is used to designate the n/address. At this time, the comparison circuit 114
'A)B' output or 'A(B' output) is at high level,
As a result, the rotation direction of the motor 5 and the y/D counter 11
3 is determined, but basically, the magnetic head 6 moves from the track position n to n' in the same manner as the movement from the reference position to the track position n.
It moves toward the track position of the address, and in this case also, the feed is performed in units of 4 steps.

When the head 6 reaches the track position n' and the head 6 is stopped at that position by the high level of the ``A,=B'' outputs of the comparison circuit 114, at this point the AND gate 109 outputs is again at a high level, therefore,
The reproduced image is displayed in the same manner as described above.

(2) Operation during recording When the recording mode is set by operating the recording switch 101, the output RC of the mode setting circuit 103 is maintained at a high level.

Here, the track address n designated by the track designation switch ins as described above at this time corresponds to the track address N designated by the counter 40 of the cassette 2 loaded in the round device. (If N, the key 45b of the slider 45 is not yet engaged with the keyway 401 of the counter 4o when the hendro reaches the track number n and stops as described above.) (The contact piece 5o and the contact piece 50' are in contact with each other.) Therefore, when the output of the AND gate 104 becomes a low level, recording of the signal is prohibited. At this time, the output of the inverter 123 becomes high level, so that the display device 107 displays that the recording is prohibited.

On the other hand, if n≧N, when the head 6 reaches the track position N in the process of being moved toward the track position n, the key 451 of the slider 45 and the keyway 40b of the counter 4o When the phases match, the two engage, and from then on, the counter 40 starts incrementing. Also, when the two engage, the contact piece 50 and the contact piece 50'
When the head 6 reaches the designated n-address track position and the "A2B" output of the comparator circuit 114 becomes high level, the output of the AND gate 104 becomes high - bell. As a result, the output of the inverter 125 becomes low level, so that the display prohibiting recording disappears from the display device 107. Then, when the recording start switch 156 is operated with the head 6 stopped at the track position n, the output of the AND gate 134 becomes high level.

When the output of the AND gate 134 becomes high level, the recording signal processing circuit 160 is activated and the video signal is sent to the magnetic head 6.
One field or one frame is then recorded on the track at designated address n of the rotating magnetic disk 10. Note that the video signal source at this time may be the output of a video camera built into the present device, a separate video camera, or a signal being broadcast.

Next, finish recording the track at address n and move to another address n'.
When performing recording on a track of 2, if the address n' specified at this time is n'>n, the head 6 is advanced to the track position of address n', and the counter 4 is
0 is also incremented to address n', making it possible to record on the track at address n'. Conversely, if n'<n, the 'A(B') output high level of As a result, the flip-flop 119 is set and its Q output becomes high level, so the output of the OR gate 120 becomes high level, and this causes the solenoid drive circuit 121 to energize the solenoid 51 and change the stator 45 from the counter 40. As a result, since the contact piece 50 and the contact piece 50' come into contact with each other, the AND gate 104 prohibits recording to the track at address nJ, and the head 6 is placed at the track position at address n'. Slider 4 is moved while
5 will end up idling. Incidentally, if the specified track address is changed from n' to n' in this write-inhibited state, if n' is nl > n (>n') with respect to n, the head 6 will move to the track at address n'. At this time, the "A)-B" output of the comparison circuit 114 becomes a high level (nI > nl), so the flip-flop 119 is reset and its Q output becomes a low level. As a result, the output of the geoagate 120 becomes low level, and the solenoid drive circuit 121 cuts off the excitation of the solenoid 51. Therefore, as above,
In the process of moving the handlebar toward the trunk position n', when it reaches the track position n, the styder shell 45 and the counter 40 are engaged, and the handlebar 45 is moved toward the trunk position n'.
40 is stepped up to n', and the flip-flop 119 is reset by the "A)B" output high level of the contact piece 50 comparison circuit 114, and its Q output becomes low level, so that the output of the Luor gate 120 becomes a low level, and the excitation of the solenoid 51 by the solenoid drive circuit 121 is cut off. However, in this state, the slider 4
Since the key 45b of No. 5 and the keyway 40b of the counter 4o are not in phase, the slider 45 is in a detached state from the counter 4o, and the contact piece 5o and the contact piece 50' are in contact with each other. will be prohibited. Therefore, in the recording mode, recording is possible only when a trunk with a larger address (the address of the track on which recording was previously performed) is specified.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described above, the azimuth adjustment screw can be rotated and adjusted based on two pivot points provided on the substrate that supports the head, and around these two pivot points. Since one of the two pivot points is configured to be adjusted in height with respect to the other point by adjusting the adjustment screw, the azimuth adjustment with respect to the recording track of the head is perpendicular to the recording track. Adjust the tilt direction,
Each can be performed separately and independently without interfering with each other.

[Brief explanation of drawings]

10 to 9 are diagrams for explaining the present invention in detail; FIG. 1 (&) is a plan view of the cassette;
Figures (b+ is a side sectional view of the cassette, Figure 2 is a plan view of the magnetic disk drive seen from the direction opposite to the loading direction of the cassette, Figure 3 (al is the rear side of the magnetic disk drive shown in Figure 2) 6(b) is a plan view when the stepping motor is installed in a direction perpendicular to the screw shaft, and FIG. 4 is a perspective view of the magnetic disk device shown in FIG. 5(a) is a perspective view of a magnetic head carrier, FIG. 5(b) is a plan view of a bimorph equipped with a magnetic head and its support member, and FIG.
FIG. 6 is a side sectional view of the magnetic disc shown in FIG. 2, and FIG. 9 is a side sectional view of the magnetic disk shown in FIG. @l Katana de Azu shows the circuit that makes it. In the figure, 6 is a magnetic head, 11 is a bimorph, 12 is a bimorph support member, 13 is a screw, 14 is a mounting member, 12θ
and 12f are two positioning holes, 18 is an azimuth adjustment screw, 17 is a mounting screw, 19 is a pressing spring, 15 is a positioning conical pin, 16 is a conical adjustment screw, 14a is a positioning hole,
21 is a positioning conical pin, 22 is an adjustment screw, 25 is a set screw, and 24 is a suppression spring.

Claims (2)

[Claims] (1) The first substrate holding the head is pivotably supported at two points and is rotatable about an axis connecting the two points, and one of the two pivot points is connected to the other one. The height of the pivot point can be adjusted in a direction perpendicular to the recording track direction of the head, and the rotation of the shaft connecting the two points corresponds to the azimuth displacement of the head. A head adjustment mechanism in a recording/reproducing device characterized by adjusting the height of the head. (2) It is characterized in that it is rotatable about a second axis with reference to the two pivot points, supports a first head substrate, and the first and second axes are substantially perpendicular to each other. A head adjustment mechanism in a recording/reproducing apparatus according to claim 1.