JPS5982621A - Structural body for rotary head - Google Patents

Abstract

PURPOSE:To make thin the constitution of the titled device and to use the device as a rotary head structural body for a small-sized VTR or the like by providing the device with a means pivotally supporting a rotary member around a static drum and a means transmitting/receiving signals between the rotary member and the static drum. CONSTITUTION:The rotary drum 21 and the static drum 22 are cylindrically engaged, ring-like groove parts (a), (b) are formed oppositely and steel balls 26 are inserted into the grooves to support the rotary drum 21. A supporting member 23 provided with a fixed transformer 5, a stator 27 and a stator coil 28 is engaged with the static drum 22 and the rotary drum 21 is revoluted by a rotary magnet 29, the stator 27 and the stator coil 28 fitted to the rotary drum 21. A magnetic head 14 is fixed on the rotary drum 21 together with a base plate 13, and the rotary transformer 4 fitted to the rotary drum 21 and the fixed transformer 5 fitted to the static drum transmit/receive signals transmitted/ received by the magnetic head 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides helical scan type rotary head magnetic recording 1!
1 Regarding the rotating drum structure in the production equipment, etc.
In particular, the present invention relates to a drum structure constructed so that the axial direction = J direction is as small as possible.

The present invention will be explained in detail below with reference to the drawings. FIG. 1 is a sectional view showing an example of a conventional rotary hexagonal tram structure. The conventional head drum structure is as shown in Fig. 1.
A rotary head drum l is supported on the rotary shaft 12 by pole bearings 6 and 7, and a rotary head tram and a driving rotary muck net part 8 are mounted on the lower side of the yoke 1 receiving part.
is arranged. That is, on the upper side of the figure, several primary windings 4 of a rotary transformer are mounted on the supporting member 3 on the rotating drum side, and a secondary winding 5 of a Rokley transformer is mounted on the stationary drum side. Further, on the lower side of the bearing, a rotary magnet 8 is attached to the rotating tram side with a support member 11, and a stator 9 and a stator coil 10 are attached to the stationary tram side with a handle j (14 is a number attached to the rotating tram 1 by a board 13). The output is connected to the primary winding 4 of the rotating drum through a lead wire (not shown), and is electromagnetically coupled to the fixed transformer (secondary winding) side via this transformer. The magnetic tape for recording and playback runs diagonally along the surfaces of a rotating drum and a stationary drum, and the scanning of the rotating gutter creates a magnetic tape on the tape surface in the same direction.
- Form a rack.

In the conventional drum structure as shown in FIG. If the ram structure is made small, it is difficult to obtain a rotation of 1.1 mm, and it is extremely difficult to make the ram structure thinner in the axial direction.

The present invention has been made in view of the above points, and an object of the present invention is to provide a rotary head structure that improves the shaft support method of one rotating ram and the arrangement of the signal transfer means, and allows the device to be made thin. shall be.

FIG. 2 is a sectional view showing an embodiment of the head drum structure according to the present invention. As shown in the figure, the rotary drum L21 and the stationary tram 22 are cylindrically fitted, and the fitting portion is provided with annular grooves a and b facing each other, and the S1 ball 26 is inserted into these to support the rotating drum 21. A supporting member 23 provided with a fixed transformer 5, a stator 7-27, and a stator coil 28 is fitted into the stationary tram 22, and the rotary drum 21 is supported by a rotary magnet 29, a stator 27, and a stator coil 28 provided in the rotating tram 21. drive the rotation. The magnetic head 14 is attached to the rotating drum 2 along with the substrate 13.
The signals sent and received by the nod 14 to the magnetic field are received and received by the rotary transformer 4 provided on the rotary drum 21 and the fixed transformer 5 of the stationary tram. Further, the screw 24 is inserted into the threaded portion provided on the support member 23, and the steel ball 25 is brought into contact with the groove provided at the center of rotation of the rotating 1S ram through the groove C provided at the tip of the screw, and the rotation ffti And there is no vertical play to remove it.

By using the above-mentioned adjustment, the swing accuracy of the rotating drum can be improved by adjusting the swing accuracy of the drum support parts a and b.

Determined by C1d and steel ball 25.26, Fig. 1>
Compared to the conventional device of F., the number of parts that require precision has been significantly reduced. In addition, since the drum support part serving as the support means has a large radius on the rotating surface, the interval between the support parts can be made very small.Moreover, since the center of rotation is a hole, the rotary transformer 4 and the fixed transformer as the transfer means can be used. 5 in this part allows the drum structure to be made very thin.

Of course, the drum supports a, b, c, and d may be separate members, and the rotating drum and the stationary drum may be fitted therein.

-) FIG. 3 is a sectional view showing another embodiment of the present invention. In the device shown in the figure, two stages of annular (R) portions a are provided on the inner periphery of the stationary drum 32, and an annular member 38 having an annular groove portion is provided at the position of the rotating ram 31 corresponding to these.
A steel ball 37 is inserted between both grooves, and the rotating drum 31 is fitted to the annular member 38 to create a magnetic field that supports the rotating tram 31.
l;' 14 is removed from the rotating drum 31.

A member 36 that supports the rotating transformer 4 and the rotary magnet 35 is fitted and added to the lower side of the rotating drum, and a member 33 that supports the fixed transformer 5 and the stator coil 34 is attached to the lower side of the stationary drum 32. The rotary drum 31 is rotationally driven by the magnet 35 and the stator coil 34, and the signals sent and received by the magnets 21 and 14 are transferred between the rotary transformer 4 and the fixed transformer 5. With this structure, the surface runout accuracy of the rotating drum is determined by the supporting parts a and b of the rotating drum, so the number of parts that require precision can be significantly reduced compared to devices using conventional methods. I can do it. In addition, because the radius of the tram support part as a support means on the rotating surface was made large,
At the same time, the rotary transformer 4, 1M constant transformer 5 and drive unit can be placed in the space at the center of the drum.
The thickness in the vertical direction is only the distance between the upper part of the magnetic heads 14 of the rotary drum 31 and the support parts a and b, resulting in a very thin tram structure.

Of course, the support part a may be fitted to the stationary tram 32 as a separate member.

As described above, according to the rotary hent structure according to the present invention, 1
Since the rotary transformer as a signal transfer means is placed closer to the rotation center than the means for rotatably supporting the rotating drum as a rotating member relative to the stationary tram, stable rotation can be achieved without increasing the size in the axial direction. It is possible to obtain a rotary head structure that can be used as a rotary head structure for small-sized VTRs, etc., and can be extremely effective in terms of device configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional rotating head structure, FIG. 2 is a sectional view showing an embodiment of the rotating head structure according to the present invention, and FIG. 3 is a sectional view showing another embodiment of the present invention. It is. 21.31---One rotation tram, 22.32---One stationary drum, 4---One rotation coil, 5---One stationary coil, 13---One magnetic throat board, 14--- -One magnetic bend, 29.35---One rotation magnet, 27
, 34 --- Drive coil, 23. 33 --- One stationary drum disc portion, a, b --- Annular groove portion, 26 , 37
-----Steel ball, c, d---One rotation center hole, 25-
--One steel ball. Patent applicant Canon Co., Ltd. 11 /Z q

Claims (1)

[Claims] l) A rotating member with a hent on its outer circumferential surface, and a rotating member (
a stationary drum having an outer circumferential surface having approximately the same diameter as the outer circumferential surface of the drum; means for rotatably supporting the rotating member with respect to the stationary drum; A rotating head structure including means for transmitting and receiving signals between the rotating member and the stationary drum.