KR19980062738U - Rotary transformer fixing structure of head drum assembly - Google Patents

Abstract

The present invention relates to a rotary transformer of a head drum assembly, and more particularly, a rotary transformer comprising a stator fixed to a lower drum, and a rotor fixed to an upper drum rotating at high speed by a motor to maintain a predetermined distance from the stator. The improvement of the fixing structure, the lower drum 10 is fixed to the main base, the main shaft 12 penetrating the lower drum, and the upper drum fixed to the main shaft 12 to rotate at a high speed with respect to the lower drum 10 14, a head drum assembly having a rotary transformer 20 formed of a rotor 22 fixed to an upper drum and a stator 24 fixed to an adhesive surface 30 of the lower drum using an adhesive. To provide a rotary transformer fixing structure of the head drum assembly, characterized in that a plurality of receiving grooves 32 on the adhesive surface 30, the rotary transformer after bonding It is because the flat of Fig. Murray and satisfactorily maintain the adhesive strength thereby improving the signal transmission characteristics as well as have the effect of one another to provide compatibility of the rotary transformer having a different channel.

Description

Rotary transformer fixing structure of head drum assembly

The present invention relates to a rotary transformer of a head drum assembly, and more particularly, a rotary transformer comprising a stator fixed to a lower drum, and a rotor fixed to an upper drum rotating at high speed by a motor to maintain a predetermined distance from the stator. It relates to the improvement of the fixing structure.

In general, V-Cal records signals on a main base, a traveling system installed on the main base to take out a tape from a cassette and moves along a predetermined path, and records a signal on a moving tape disposed at an appropriate place of the traveling system. It is equipped with a head drum assembly for reproducing a signal from.

The present invention relates to a rotary transformer provided in a head drum assembly, a conventional head drum assembly is shown in FIG. 1, which includes a lower drum (10) fixed to a main base (not shown), and A main shaft 12 assembled through the lower drum 10, an upper drum 14 fixed to an upper end of the main shaft 12 and rotating with respect to the lower drum 10 together with the main shaft 12, and It consists of a drive motor 16 for generating a rotational power supplied to the main shaft 12 and the upper drum (14). Then, the head base 18 is attached to the bottom of the upper drum 14 so as to be height-adjustable by a screw or the like, each head base 18 to record or reproduce the video signal magnetically at the radially outer end thereof. Is equipped with a video head 19.

The drive motor 16 is composed of a stator 16a attached to the lower drum 10 and a rotor 16b fixed to the main shaft 12 to rotate with respect to the stator 16a. The rotor 16b Is rotated at high speed with the main shaft 12 and the upper drum 14 as current is supplied to the stator 16a, causing the video head 19 to scan the signal tracks of the tape in turn.

A rotary transformer 20 is installed between the upper drum 14 and the lower drum 10 to transmit a signal in a contactless manner. The rotary transformer 20 can transmit and receive video signals supplied to or output from the video head without generating noise. The rotary transformer 20 is rotated at a high speed by the driving motor 16 while being fixed to the stator 24 and the upper drum 14 fixed to the lower drum 10 and maintaining a predetermined gap with the stator 24. It consists of a rotor (22).

In addition, a pair of ball bearings 24 are interposed between the main shaft 12 and the lower drum 10 so that the main shaft 12 and the upper drum 14 and the head base 18 are rotated by the rotation of the driving motor 16. And the rotor 22 of the rotary transformer 20 as well as the video head 19 are rotated at the same time.

This head drum assembly is provided with a rotary transformer 20 for transmitting and receiving a signal read from the video head 19 or a signal sent to the video head as described above, the rotary transformer 20 is shown in FIG. As shown in FIG. 1, the rotor 22 fixed to the bottom surface of the boss 14a of the upper drum 14 and the stator 24 fixed to the adhesive surface 10b provided on the periphery of the boss 10a of the lower drum 10. ) The stator 24 and the rotor 22 are fixed to the upper drum 14 and the lower drum 10 by using an adhesive. At this time, the fixing of the rotary transformer is achieved by additionally applying a curing agent to the adhesive to shorten the working time and increase the adhesive strength.

The rotor 22 is connected to the head PC 18a fixed to the bottom of the head base 18 and the signal line (W), the stator 24 is connected to the preamplifier (not shown) by the drum connector (C) do.

The conventional fixed structure of the rotary transformer has a problem that the fixed performance of the rotary transformer having different channels as well as the performance is deteriorated due to the non-uniform distribution of the adhesive after fixing.

In other words, the surface of the rotor and the stator is relatively flat, so that the adhesive with a relatively high viscosity does not spread evenly and locally agglomerates, and the flatness and adhesive strength are reduced. This will have a problem of deterioration. In particular, in recent years, head drum assemblies having two or more video heads have been developed according to the improvement of the technology. For example, a head drum assembly with two heads, four heads, six heads, and more heads has been developed, and the rotary transformers applied to the head drum assembly require as many channels as the number of heads. Therefore, a rotary transformer has been developed in which the radius of the two-channel type shown in FIG. 2 can be extended to form a plurality of channels. Therefore, in the case of the rotary transformer having a diameter as described above, the adhesive surface becomes larger, so that the phenomenon as described above, that is, the adhesive distribution becomes poorer, and thus the flatness and the adhesive strength become worse.

In addition, conventionally, the adhesive surface formed on the lower drum has a relatively small constant size, and when the rotary transformers having different sizes are applied, the design of the lower drum has to be changed, thereby causing a very poor compatibility according to the type of rotary transformer. It was.

Accordingly, the present invention has been made to solve the above problems, its purpose is to maintain a good flatness and adhesive strength after the adhesion of the rotary transformer to improve the signal transmission characteristics, and improve the compatibility in the variation of the type of rotary transformer To provide a rotary transformer fixed structure that can be given.

1 is a longitudinal sectional view of a head drum assembly showing a fixed structure of a conventional rotary transformer;

Figure 2 is an enlarged cross-sectional view of a conventional rotary transformer fixing structure

Figure 3 is a longitudinal sectional view of the head drum assembly showing the configuration of a preferred embodiment of the rotary transformer fixing structure according to the present invention

Figure 4a is a view showing an application example of the rotary transformer fixed structure according to the present invention

Figure 4b is a view showing another application example of the rotary transformer fixing structure according to the present invention

Explanation of symbols on the main parts of the drawings

10: lower drum 10a: boss

12: spindle 14: upper drum

14a: Boss 16: Drive motor (upper drum)

18: Head base 19: Video head

20: rotary transformer 22: rotor

24: stator 30: adhesive surface

32: receiving home

An object of the present invention is to use a lower drum fixed to the main base, a main shaft penetrating the lower drum, an upper drum fixed to the main shaft to rotate at a high speed with respect to the lower drum, and a lower drum using a rotor and an adhesive fixed to the upper drum In configuring the head drum assembly having a rotary transformer made of a stator fixed on the adhesive surface of the, it can be achieved by forming a plurality of receiving grooves on the adhesive surface.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the rotary transformer fixing structure of the head drum assembly according to the present invention will be described in detail as follows. Explain.)

3 shows a configuration of a head drum assembly employing a fixed structure of a rotary transformer according to the present invention, and according to the present invention, the rotor 22 is fixed to the bottom surface of the boss 14a of the upper drum 14. There is provided a rotary transformer 20 composed of a stator 24 fixed to an adhesive surface 30 provided on the periphery of the boss 10a of the lower drum 10.

On the adhesive surface 30, a plurality of concentric grooves 32 are formed.

According to FIG. 4A, the adhesive surface 30 has the largest possible size that can be formed on the lower drum 10, and each receiving groove 32 is circularly formed concentrically with respect to the center of rotation. It is preferable that they are arranged at equal intervals in the radial direction, respectively. In addition, at least two or more receiving grooves including the receiving groove 32 located at the innermost side are preferably configured to be covered by the bottom surface of the stator 24 fixed to the adhesive surface 30.

According to the present invention having such a configuration, the adhesive applied to the adhesive surface 30 when the stator 24 of the rotary transformer 20 is fixed is pressed by the stator 24, and by this pressure, the circumferential or radial direction It spreads inward and outward. At this time, the adhesive being spread is inserted into the receiving groove 32, so that the adhesive applied between the receiving groove 32 and the receiving groove 32 adjacent thereto has a uniform distribution. This result is the same on each bonding surface divided by the receiving groove, so that the bonding state of the bottom surface and the bonding surface of the stator 24 as a whole is very good.

Therefore, according to the present invention, the flatness and adhesive strength after adhesion of the stator 24 can be maintained well.

In addition, in the present invention, the area of the adhesive surface 30 occupied by the stator 24 is enlarged even in the case of a rotary transformer having a plurality of channels (4 channels are shown for convenience) as shown in FIG. 4B. This results in the same result in the adhesive surface 30 between the receiving groove located in the enlarged area and the receiving groove adjacent to it to maintain a good flatness and adhesive strength as described above.

As described above, the rotary transformer fixing structure of the head drum assembly according to the present invention forms a plurality of receiving grooves on the adhesive surface so that the adhesive is pressed by the stator into the receiving groove so that the adhesive does not locally aggregate Since the flatness and adhesive strength of the rotary transformer are maintained well, it is possible to improve signal transmission characteristics and to provide compatibility of rotary transformers having different channels.

Claims (4)

A lower drum 10 fixed to the main base, a main shaft 12 penetrating the lower drum, an upper drum 14 fixed to the main shaft 12 to rotate at a high speed with respect to the lower drum 10, and an upper drum. In constructing a head drum assembly having a rotary transformer 20 composed of a stator 24 fixed on the adhesive surface 30 of the lower drum using a fixed rotor 22 and an adhesive, Rotary transformer fixing structure of the head drum assembly, characterized in that to form a plurality of receiving grooves (32) on the adhesive surface (30). 2. The rotary transformer fixing structure of claim 1, wherein the plurality of receiving grooves (32) are arranged in a circle concentrically about a center of rotation of the upper drum. 3. The rotary transformer fixing structure according to claim 2, wherein the plurality of receiving grooves (32) are arranged to have equal intervals in the radial direction. 4. The bottom of the stator 24 according to claim 3, wherein the plurality of receiving grooves 32 include innermost receiving grooves in the radial direction and at least two receiving grooves 32 are fixed to the adhesive surface 30. And a rotary transformer fixing structure of the head drum assembly.