KR19990013588U - Rotary Transformer Bonding Structure of Head Drum Assembly - Google Patents

Abstract

The present invention discloses a rotary transformer adhesive structure of a head drum assembly.

In the conventional rotary drum adhesive structure of the head drum assembly, when the adhesive is unevenly applied to the upper and lower drums, poor adhesion of the rotor and the stator transformer occurs, and the parallelism between the voids is not maintained accurately, and the adjustment of the voids is performed. This became difficult and the yield of a product fell, and the signal transmission characteristic of a rotary transformer fell.

In the present invention, the rotor and stator transformer of the rotary transformer are each formed such that a plurality of grooves are substantially circularly concentric in a circle so that an adhesive flows into the adhesive surface to form a uniform layer. Therefore, since grooves of a simple configuration and structure are formed on the adhesive surfaces of the rotor and stator transformers constituting the rotary transformer, the adhesive layer is kept uniform, preventing adhesion failure, and the yield of the product is remarkably improved. The signal transmission characteristics of the transformer are improved.

Description

Rotary Transformer Bonding Structure of Head Drum Assembly

The present invention relates to a head drum assembly, and more particularly, to a rotary transformer adhesive structure of a head drum assembly to prevent a poor adhesion of a rotary transformer.

In general, a tape recorder such as a video cassette recorder (VCR) or a camcorder (recorder) records video and audio signals on a tape of a cassette running along a certain driving path of the odometer by rotating the head drum assembly. Or play it back.

One example of such a head drum assembly will be described with reference to FIG. 1. In the head drum assembly, the upper drum 10 and the lower drum 11 are mounted on the upper and lower portions of the shaft 12, respectively. In this case, the upper drum 10 is press-fitted to the shaft 12, and the lower drum 11 is supported and mounted by two bearings 13.

In addition, a rotary transformer 14 for transmitting a signal is interposed in the space between the upper drum 10 and the lower drum 11. Rotary transformer 14 is composed of a rotor transformer (15) bonded to the lower surface of the upper drum (10) and a stator transformer (16) bonded to the upper surface of the lower drum (11), the rotor and stator Transformers 15 and 16 are bonded to each other to maintain a constant air gap.

Then, two or more video heads 17 are assembled on the lower surface of the upper drum 10, a drum motor 18 is installed below the lower drum 11, and the drum motor 18 is driven. As a result, the upper drum 10 is rotated about the axis 12 to perform recording or reproduction of the video signal by the action of the video head 17.

As shown in FIG. 2, the rotary transformer adhesive structure of the conventional head drum assembly includes a preload boss 10a in which a shaft 12 is press-fitted in the center of the upper drum 10, and an upper surface of the lower drum 11. Table 11a protrudes in an annular shape, and the preload boss 10a of the upper and lower drums 10 and 11 and the rotor and stator transformers 15 and 16 are provided on the table 11a. Each is bonded by an adhesive 19.

However, the rotary transformer adhesive structure of the conventional head drum assembly as described above is used when the adhesive 19 is unevenly applied to the preload boss 10a and the table 11a of the upper and lower drums 10 and 11. There was a problem that poor adhesion between the rotor and the stator transformers 15 and 16 occurred. For example, the adhesive 19 is usually applied to the preload boss 10a and the table 11a of the upper and lower drums 10 and 11 by an automatic applicator, so that the supply amount of the adhesive 19 is not constant. Therefore, the layer of the applied adhesive 19 becomes nonuniform.

When the layer of the adhesive 19 is unevenly applied, the rotor and stator transformers 15 and 16 are adhered to the preload bosses 10a and the table 11a of the upper and lower drums 10 and 11. As the rotor and stator transformers 15 and 16 are lifted in one direction, the parallelism between the voids decreases. That is, since the parallelism of the rotor and the stator transformers 15 and 16 is changed according to the amount of application or application of the adhesive 19, not only the parallelism of the pores can be accurately maintained due to poor adhesion, but also the adjustment of the pores is made. It became difficult and the yield of the product fell. In addition, when the parallelism between the rotor and the stator transformers 15 and 16 is lowered, there is a problem that the signal transmission characteristics of the rotary transformer 14 are significantly reduced.

The present invention is devised to solve the conventional problems as described above, the object of the present invention is to prevent the poor adhesion by a simple configuration and structure to improve the yield of the product, as well as to improve the signal transmission characteristics To provide a rotary transformer adhesive structure of a head drum assembly.

1 is a cross-sectional view showing a general head drum assembly,

Figure 2 is a cross-sectional view showing a rotary transformer adhesive structure of a conventional head drum assembly,

3 is a perspective view partially showing a rotary transformer adhesive structure of a head drum assembly according to the present invention;

4 is a cross-sectional view showing a rotary transformer adhesive structure of the head drum assembly according to the present invention,

Figure 5 is a perspective view showing an embodiment of the rotary transformer adhesive structure of the head drum assembly according to the present invention.

♣ Explanation of symbols for the main parts of the drawing ♣

10: upper drum 10a: preload boss

11: lower drum 11a: table

12: shaft 13: bearing

14: rotary transformer 15: rotor transformer

15a: Adhesive side (of rotor transformer) 16: Stator transformer

16a: adhesive side (of stator transformer) 17: video head

19: adhesive 20: groove

A feature of the present invention for achieving the above object, in the rotary transformer of the head drum assembly consisting of a rotor and a stator transformer bonded to the upper and lower drum to transmit a video signal, the rotor and stator transformer of the rotary transformer In the rotary transformer adhesive structure of the head drum assembly, a plurality of grooves are respectively formed in a substantially circular concentric circle so that an adhesive flows into the adhesive surface to form a uniform layer.

Hereinafter, one preferred embodiment of a rotary transformer adhesive structure of a head drum assembly according to the present invention will be described in detail with reference to the accompanying drawings.

3 to 5 are views for explaining the rotary transformer adhesive structure of the head drum assembly according to the present invention, the basic configuration of the head drum assembly described in Figure 1 will be described with the same reference numerals.

First, referring to Figures 1 and 3, the head drum assembly, the upper drum 10 and the lower drum 11 is mounted on the upper and lower portions of the shaft 12, respectively. In this case, the upper drum 10 is press-fitted to the shaft 12, and the lower drum 11 is supported and mounted by two bearings 13. On the other hand, it is easily understood by those skilled in the art that the upper drum 10 is supported and mounted by the bearing 13 and the lower drum 11 may be press-fitted and mounted.

In addition, a rotary transformer 14 for transmitting a signal is interposed in the space between the upper drum 10 and the lower drum 11. The rotary transformer 14 is composed of a rotor transformer 15 adhered to the lower surface of the upper drum 10 and a stator transformer 16 adhered to the upper surface of the lower drum 11. The rotor and stator transformers 15 and 16 Are bonded to each other to maintain a constant void. Here, it is preferable that the gap formed between the rotor and the stator transformers 15 and 16 is maintained at about 20 to 40 mu m.

Then, two or more video heads 17 are assembled on the lower surface of the upper drum 10, and a drum motor 18 is installed below the lower drum 11, and the upper is driven by the drum motor 18. The drum 10 is rotated about the axis 12 to perform recording or reproduction of a video signal by the action of the video head 17.

As shown in FIG. 3 and FIG. 4, the preload boss 10a which presses the shaft 12 in the center of the upper drum 10 is mounted, and the rotor transformer 15 is adhere | attached on the lower surface of this preload boss 10a. On the upper surface of the lower drum 11, the table 11a protrudes in an annular shape so that the stator transformer 16 can be bonded. The rotor and stator transformers 15 and 16 are respectively bonded to the preload bosses 10a and the table 11a of the upper and lower drums 10 and 11 by the adhesives 19, respectively. Will be constructed.

In the rotor and stator transformers 15 and 16 of the rotary transformer 14, a plurality of grooves 20 are formed on the adhesive surfaces 15a and 16a so as to be substantially circularly concentric. At this time, the grooves 20 are preferably formed at equal intervals.

As shown in FIG. 5, the rotor and stator transformers 15 and 16 of the rotary transformer 14 are each formed such that a plurality of grooves 20 are formed on the adhesive surfaces 15a and 16a so as to have a substantially diagonal shape.

Looking at the adhesion state to the rotary transformer adhesive structure of the head drum assembly according to the present invention as described above are as follows.

As shown in FIG. 3 and FIG. 4, the rotor and the stator are applied to the preload boss 10a and the table 11a of the upper and lower drums 10 and 11 by an automatic applicator or the like. When the adhesive surfaces 15a and 16a of the transformers 15 and 16 are bonded to each other, a part of the adhesive 19 is circular to the adhesive surfaces 15a and 16a of the rotor and stator transformers 15 and 16. Flow into the grooves 20 are formed to be uniformly bonded. In other words, either the preload boss 10a of the upper and lower drums 10 and 11 and the rotor 19 and the stator transformer 15 and 16 are adhered to each other even when the adhesive 19 applied to the table 11a is uneven. A layer of adhesive 19 remains uniform, i.e., flat, as the adhesive 19 applied to the effluent flows into the grooves 20.

Then, the adhesive surfaces 15a and 16a of the rotor and stator transformers 15 and 16 are attached to the preload bosses 10a and the table 11a of the upper and lower drums 10 and 11 by the adhesive 19. In the bonded state, the rotor and stator transformers 15 and 16 are pressed with a predetermined force to cure the adhesive 19, and then the rotor and stator transformers are assembled during the assembly of the upper and lower drums 10 and 11. 15) Assemble to maintain a constant void between (16).

As such, the rotor and stator transformers 15 and 16 remain bonded to each other by the adhesive 19 which maintains a uniform layer, so that the parallelism of the pores is accurately maintained and adhesion failure is prevented, as well as adjustment of the pores. This becomes simple and easy, and the yield of the product is remarkably improved. In addition, if the parallelism of the rotor and stator transformers 15 and 16 is correctly maintained, the signal transmission characteristics of the rotary transformer 14 are improved, and as a result, the image quality is vividly improved, thereby improving product reliability.

As shown in FIG. 5, even when the grooves 20 are formed in a lattice shape on the adhesive surfaces 15a and 16a of the rotor and stator transformers 15 and 16, the adhesive state of the adhesive 19 is the same as described above. Is kept uniform.

On the other hand, the above-described embodiment is merely to describe one preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed appropriately within the scope of the same idea. For example, the shape and structure of each component specifically shown in the embodiment of the present invention can be modified.

As described above, according to the rotary transformer adhesive structure of the head drum assembly according to the present invention, since grooves having a simple configuration and structure are formed on the adhesive surfaces of the rotor and stator transformer constituting the rotary transformer, the layer of the adhesive is maintained uniformly. This prevents poor adhesion and significantly improves the yield of the product, as well as the signal transmission characteristics of the rotary transformer.

Claims (2)

In a rotary transformer of a head drum assembly consisting of a rotor and a stator transformer bonded to upper and lower drums for transmitting a video signal, The rotor and stator transformers 15 and 16 of the rotary transformer 14 have a plurality of grooves 20 approximately circular in such a manner that an adhesive layer 19 flows into the adhesive surfaces 15a and 16a to form a uniform layer. Rotary transformer adhesive structure of the head drum assembly, characterized in that each formed to form a concentric circle. 2. The rotary transformer adhesive structure of claim 1, wherein the grooves are formed in a substantially lattice shape.