JPS5819725A - Rotary head device - Google Patents

Abstract

PURPOSE:To reduce the size of the axial direction and to eliminate the deformation of a fixed upper drum, by providing a roll bearing between the counter faces at the outer circumference where a rotary member is opposite to either one of the upper and lower fixed drums and providing a through hole at the rotary center part of the rotary member. CONSTITUTION:A roll bearing 49 is provided between the counter outer circumference faces 43 and 44 at the outer circumference side where a rotary member 36 is opposite to either one of the upper and lower fixed drums 31 and 32. Thus the axial size is reduced with reduced thickness to ensure stable and highly accurate rotation. Furthermore an attachment screw 59, i.e., a fixing means of the drum 31 is provided at the center part of both drums 31 and 32 through a through-hole 58 of the member 36. Thus the drum 31 is free from deformation, and the relative position between the drums 31 and 32 can be controlled in a simple way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a rotary head type magnetic recording/reproducing device.

In recent years, rotating head type magnetic recording equipment (〆t(Vi'l)
Q's 4th grade to 1-1 grade has progressed, and portable VTft ;/1
'-It's starting to become popular. Along with this, the rotating head device has become smaller and A%'-shaped.7. (However, the conventional type is approaching its limit in terms of shielding. Figure 1 shows a conventional head bar rotation type rotary head device.

The cylindrical fixing drum 1 and the fixing F-drum 2, which are divided into upper and lower parts, are connected to the connecting part 4. J3 and 14y edition screw 4.5
is fixed to maintain a predetermined 4'l'' position.

The outer peripheral surfaces of both drums 1 and 2 are tape running surfaces, and a magnetic tape (not shown) is arranged on the outer peripheral surface of the fixed lower drum 2.
4) Leads 6 are formed. A rotating part ]7 is arranged at the center of both drums 1.2, and rotates Il! 1II7 is rotatably mounted on the fixed lower drum 2 by bearings 8.9. The rotating shaft 7 has a head bar] O is the mounting screw 1
1, a head plate 12 is fixed to the head bar 10 at RT, and at least one head substrate 14 having a magnetic head 13 is fixed to the head plate 12 by a mounting screw 15. A rotation (III winding 16) of a rotary transformer is attached to the heel L' bar 10, and a stationary side winding 17 of a rotary transformer is attached to the fixed lower drum 2 opposite to this, and a rotating side winding is attached to the fixed lower drum 2. line 1
The signal 6 is input to the magnetic head 13, and signals inputted manually to the magnetic head 1 or signals outputted from the magnetic head 13 are inputted and outputted through the electromagnetic coupling of the rotary transformer.

A support member 18 is fixed to the lower end of the rotating shaft 7 so as to eliminate play in the axial direction of the bearing 8.9, and applies a preload to the bearing 8.9. A rotary yoke 20 of a motor 19 is fixed to the support member 8 by a mounting screw 21.

A rotary magnet 22 and a magnet sensor 23 for detecting the position ti of the magnetic head 13 are attached to the rotary yoke 20. Opposing the rotary magnet 22,
The stator 24 and stator coil 25 are fixed to the lower drum 2
Fixed. 26 is 4 printed circuit boards for motor 19,
A sensor 27 detects the phase of the rotary magnet 220. The magnet sensor 23 is also used for rotation detection to control the normal rotation state of the magnetic head 13 'Ai.

In the conventional rotary head device shown in FIG. 1, since the head par 10 is attached h+v to the rotary shaft 7 and the rotary shaft 7 is supported by the bearing 8.9, the bearing 8.9 is supported by the bearing 8.9. If the interval 2 of 9 is made smaller, the inclination of the rotating shaft 7 due to the deviation in the relative positions of the bearings 8 and 9 will have a large effect on the rotation locus of the magnetic head 130, making it difficult to obtain high-precision rotation. It has been extremely difficult to make the rotary head device thinner in the axial direction.

Further, the fixed drum l and the fixed lower drum 2 are connected at their outer circumferential portions by a connecting member 3, and from the side there are mounting screws 4.
．． 5, there was a risk that the fixed upper drum l would be deformed by the tightening force. Furthermore, both drums 1.2
In order to keep the parts in a predetermined relative positional relationship, the position of 18 degrees has to be taken very seriously, but in the past, adjustments such as inserting a thin washer of 5 to 6 μm between the coupling member 3 and the drum 1 or 2 and tightening the Because of the method used, it took time to make adjustments.

The purpose of the present invention is to solve two problems and solve the following problems.
It is possible to reduce the dimensions of the direction and make it thinner, and it is fixed.
It is an object of the present invention to provide a rotary head device that can easily adjust the relative position of a fixed upper drum without worrying about deformation of the drum.

To achieve this objective, the present invention provides a fixed upper driver l,
A) At least one rolling bearing is provided between the facing surfaces near the outer periphery where either one of the fixed lower drum and the rotating member faces, and a hole is provided in the center of rotation of the rotating member, and the rotating member is fixed. The present invention is characterized in that a means for fixing the fixed upper drum is disposed in the center of both the upper and lower drums through a hole in the rotating member.

Hereinafter, the present invention will be explained in detail based on a single example of implementation.

FIG. 2 shows an embodiment of the invention. The outer periphery of the fixed upper drum 31 and the fixed lower drum 32, which are divided into upper and lower parts, forms a tape running surface, and the outer periphery of the fixed lower drum 32 has a tape guide 33 for guiding a magnetic tape (not shown). will be provided. 11! a rotating member 36 is arranged in the internal space 34,35 of the I-stop drum 31 and the fixed lower drum 32;

Annular grooves 39.40 are provided on the opposing inner circumferential surfaces 37, 38 of the fixed upper drum 31 and the fixed lower drum 320, which are provided in positions facing the rotating member 36 and close to the outer circumferential surface of the butt. Annular grooves 45, 46 are provided in the opposing outer peripheries 43, 44 of the rotating wheel members 41, 420, which are attached to the positions of the opposing rotating members 36, respectively. A plurality of steel balls 47 are placed between the annular grooves 39.45 and 40.46.
, 48 are inserted respectively. The annular grooves 39, 45 and the steel balls 47 form one rolling bearing 49, and the annular grooves 40, 46 and the steel balls 48 form the other rolling bearing 50. The rotating member 36 is rotatably supported on the fixed lower drum 32 by rolling bearings 49,50. The rotating ring member 41 is fixed to the rotating member 36 by tightening a washer 51 with a mounting screw 52 . The rotating ring member 42 is fixed by a tightening ring 53 screwed into the rotating member 36.

The fixed lower drum 32 is attached to the support member 54 by screws 5 and 11'y.
Fixed by 5. The support member 54 supports the fixed lower drum 3
It has a protrusion 56 located at the center 7<15 of 2.

A cylindrical connecting portion 57 is provided at the center of the fixed upper drum 3J, and the connecting portion 57 passes through a hole 58 provided at the center of rotation of the rotating member 36, comes into contact with the protruding portion 56, and connects the Jl.
! It is fixed by a Y-head screw 59. The protruding portion 56, the connecting EHI 57, and the mounting screw 59 correspond to the fixing means of the present invention.

A head substrate 61 is attached to the rotating member 3 ( ) by a head board 61 and a fork head screw 62 , and the height of the magnetic head 60 is adjusted by a height adjusting screw 63 .

The edges of the opposing end surfaces of the fixed upper drum 31 and the rotating member 36
Each station has a stationary rotary transformer for signal transmission 9↓
The +I winding 64 and the rotation side winding 65 are attached. A rotary magnet 66 and a rotary yoke 67 are fixed to the rotating member 36 inside the rolling bearing 50, and a stator 68 and a stator coil 69 are fixed around the protrusion 56. 70 is a printed circuit board, 71 is a sensor for detecting the phase of the rotary magnet 66, and 72 is a magnet sensor for detecting the adhesion of the magnetic head 6o.

When the stator coil 69 is energized from one flood circuit (not shown), rotational force acts on the rotary magnet 66,
The rotating member 36 is rotated while being supported by rolling bearings 49,50.

On the outer peripheral surfaces of the fixed upper drum 31 and the fixed lower drum 32,
A magnetic tape (not shown) is wound around it and runs.
The magnetic head 6 rotates at a rotation speed faster than the running speed of the magnetic tape.
Recording or reproduction is performed by rotating and scanning the magnetic surface of the magnetic tape.

Signals sent and received between the magnetic head 60 and the magnetic tape are sent to and received from the rotating side winding 65 and r/) of the rotary transformer.
The signal is inputted from the signal processing circuit through the 111 winding 64 or outputted to the signal texture circuit.

According to this embodiment, since the rolling bearing 49.50 is provided close to the outer periphery of both the fixed upper and lower drums 31.32, the diameter of the rolling bearing 49.50 is increased, and the relative position of the rolling bearing 49.50 is increased. The influence of positional deviations or irregularities on the rotation locus of the magnetic head 6o is reduced. Therefore, the distance between the rolling bearings 49.500 can be reduced, and a thinner design can be achieved.

Furthermore, the rotational accuracy of the rotating member 36 is 49.5% using a rolling bearing.
Since the rotating shaft 7 shown in FIG. 1 does not exist, the number of high-precision parts is reduced, and the rotational precision of the rotating T7B material 36 can be increased.

Furthermore, both fixed upper and lower drums 31 and 32 have no rotating shafts.
A connecting portion 57 and a protruding portion 56 are arranged at the center of the 57., and both 57.
56 are connected, the connecting member 3 of FIG. 1 is eliminated, and deformation of the fixed upper drum 1 can be eliminated. The relative position adjustment of the fixed upper and lower drums 31 and 32 is as follows:
This can be done very easily by applying a method such as tightening the mounting screw 59 by abutting the outer circumferential surface of the fixed upper drum 31 against the reference surface.

FIG. 3 shows another embodiment of the invention. Same as FIG. 2; portions at ζ are indicated by the same reference numerals. Opposed to the rotating member 36, -
Opposing inner circumferential surface 73 provided in a position close to the outer circumferential surface of the eye
Two fixed ring members 74 are arranged, and the rotating member 36
Two rotary/rotational members 76 are disposed on the opposing outer peripheral surfaces 75 of the rotary member 76, and annular grooves 77, 78 are provided in the fixed 113 member 74 and the rotary ring member 76, respectively. Shaped groove portion 77.
A steel ball 79 is inserted between the holes 78 . The fixed ring member 74, the rotating ring member 76, and the steel balls 79 form a rolling bearing 80. The two rolling bearings 80 are kept apart by a spacer 81, and the washer 51, mounting screw 52, and tightening ring 53 are used to fix the two rolling bearings 80.

The upper end surface of the protrusion 56 of the support members 5, 1 has a square fff
A connecting portion 82 is provided, and a connecting portion 57 of the fixed upper drum 31 is provided.
A rectangular fitting protrusion 83 is provided on the lower end surface of the holder. It is fixed to the support member 54 while maintaining a predetermined phase/1 positional relationship 2 with respect to the lower drum 32.

A detection coil 84 detects the approach of the magnet sensor 72.

The operation and effect of the non-embodiment are almost the same as those of the embodiment shown in FIG. Even if the upper drum 31τ is once removed, it can be reattached to the same position, and the fitting opening 1ll (82 and the fitting convex portion 8:'3) can be processed according to the predetermined relative position 1a (
, 161 fixed upper F drums; 31. 32 It is also possible to eliminate the need to adjust the relative positions.

It may also be provided on the surface of the material 36. In addition, if Jd is used in the embodiment shown in FIG. 2 or 3, the rolling bearing 49.50
．． In this case, a means is required to prevent the rotating member 36 from tilting diagonally.Fourth, instead of the steel balls 47, 48, and 79, rollers can be used. A) may also be used.

The present invention is shown in FIG. 2 or 3 [! In addition to the head bar rotation method shown in 7+, there is an intermediate drum rotation method in which the magnetic head 60 is attached to an intermediate drum that is rotatably arranged between the fixed upper and lower parts. It also applies to

The rolling bearings 49, 50, 80 are not limited to those provided between the opposing circumferential surfaces of the fixed upper drum 31 or 32 and the rotating member 36, but are provided between the opposing circumferential surfaces of the fixed lower drum 32 and the rotating member 36. It may be provided at a position on the outer periphery E)' between the end faces.

As described above, according to the present invention, at least one rolling member is provided between the same surface of the rotating portion (O) and at least one of the fixed upper drum and the fixed upper drum and the rotating portion (O) facing each other. Since the bearing is provided, the axial dimension can be reduced to make it thinner, and the rotation axis 'it, i'i
<By this, the rotation at a fixed and high level (t) becomes the rIJ function. 1-1-] Since we have arranged the six fixing means, we need to remove the 1.5 λL 4f of the deformation of the li'N fixed upper doe stop and adjust the relative position of the fixed upper and lower dowels by 1ift. be able to.

[Brief explanation of drawings]

Q3] 1] is a cross-sectional view of a conventional rotary gutter device,
FIG. 2 is a sectional view of one embodiment of the present invention; FIG. 3 is a sectional view of another embodiment of the invention. 3]...1φ1 rooftop drum, 32... solidly lower drum, 36... rotating member, 37.38-1, opposing inner circumferential surface,
41.42... Rotating ring member, 4:3.44... Same outer peripheral surface, 49.50... Fist rolling IJIIIl receiver, 5
4...Supporting member, 56@...Protrusion part, 57...Connecting part, 58...Hole, 59...Mounting screw, 60...
Magnetic head, 66...Yu rotary magnet, 67II
IIe rotary yoke, 68...Stator, b9...
- Stator coil, 73... Opposing inner peripheral surface, 75...
Paired with the same outer peripheral surface, 80... Rolling bearing. Patent applicant: Minoru Nakamura, agent of Gyanon Co., Ltd.

Claims (1)

[Claims] 1.Fixed]' Ni drum and fixed F-drum in a predetermined phase alignment (a fixed upper drum fixed to a and a magnetic head, rotatably arranged between the fixed upper drum and the fixed lower drum Rotating parts and rotating) 115 materials? , ``J4 is equipped with a rotary head device ff2 having a moving rotational drive part 11if, and has a fixed upper drum and a fixed lower drum (both of which are opposed to each other on the outer periphery where one of them faces the rotating member).
Between 7i1 and 7i1, one rolling bearing is provided, a hole 7 is provided in the center of rotation of the rotating member, and a hole 7 is provided in the center of both the upper and lower fixed drums to fix the upper fixed drum. A rotary head device characterized by arranging means.