KR0128720B1 - Magnetic head of vcr - Google Patents

Abstract

The magnetic head for video is comprised of a hold case(11) having two connector guiding parts(11B) formed projectingly in a lower end, a cutting-off groove(11C) formed between these connector guiding parts and a fixing protuberance(11E); a terminal pin guide(11A) being formed in an interface of the connector guiding parts(11B); a protuberance part(11D) bigger than the width of a middle part being formed together in an end of the connector guiding parts(11B); a coil assembly(13) receiving the protuberance part and the fixing protuberance of the hold case to form an inserting hole(13B) and hooking threshold(13D) for performing a hooking operation and a guiding groove(13C) for guiding the terminal pin guide(11A) in which, here, the terminal pin(13A) is arranged projectingly in space between the connector guiding parts with the hold case assembled completely.

Description

Magnetic Head for Video

The present invention relates to a magnetic head for video, and more particularly, to form an uneven guide portion in the coil assembly and the hold case, respectively, to increase the assembly precision, to uniformly maintain the elastic pressing force of the front and rear cores, and to support the coil by the support portion. The present invention relates to a magnetic head for video that can firmly support an assembly to improve the electrical characteristics of a product and increase the reliability of the product.

A conventional magnetic magnetic head for video is described with reference to FIGS. 1 to 3. 1 is a perspective view showing a conventional video magnetic head, FIG. 2 is an exploded perspective view showing a conventional video magnetic head rotated 90 degrees, and FIG. 3 is a cross sectional view showing a conventional video magnetic head.

As shown in these figures, the video magnetic head is provided with a hold case 1 having a predetermined shape for mounting the head components. The back surface of this hold case 1 is formed with an opening part for mounting components, such as a core. In this opening part, the front core 2 which formed the cap 2A which is a recessed groove part in the longitudinal direction is inserted, for example.

The front core 2 can be melted and filled with a nonmagnetic glass material or the like.

The rear core 4 is mounted through the opening, and the rear core 4 is assembled with the coil assembly 3 in which the coil 3B is wound on the coil bobbin 3A.

Accordingly, the hold case 1 has a front core 2, a back core 4 and a coil assembly 3 inserted therein.

In addition, the hold case 1 is fastened to an elastic member 5 such as a spring to prevent any detachment of each inserted component. That is, the elastic member 5 has a fixing protrusion (5A) formed integrally, the fixing protrusion (5A) elastically each component in the fixing hole (1A) formed on both sides of the hold case (1). Tighten while pressing.

In addition, the elastic member 5 is elastically the elastic projection (5B) that is in contact with the back core (4) when tightened to the hold case (1) to impart an elastic force to compress the front core (2) and the back core (4) It is formed integrally with the center of the subsidiary (5). The coil assembly 3 forms a coil bobbin 3A to wind the coil 3B, and inserts and installs a terminal pin 3C to draw the coil 3B to the outside. The terminal pin 3C is soldered to the connector 6 and assembled with a connector connected to a circuit board (not shown) so that a current flows through the magnetic head for video.

4 is an exploded perspective view showing another embodiment of the conventional video magnetic head, and FIGS. 5A and 5B are a part showing the assembling operation of the video magnetic head in another embodiment of the conventional video magnetic head. It is a cross section. The same parts will be described using the same symbols.

4 and 5, the shape of the hold case 1, the coil assembly 3, and the elastic member 5 is completely changed. That is, the front core 2 is inserted with the upper surface of the hold case 1 as an opening. In this case, the elastic member 5 is installed such that the front core 2 is in close contact with the rear core 4. It is the same as the conventional example. Here, in the second conventional embodiment, a concave guide groove 1B into which the elastic member 5 is inserted is integrally formed in the hold case 1, and a rear core 4 is assembled to the coil assembly 3. The assembling hole 3D is formed, and the assembling protrusion 1C is integrally formed in the hold case 1 so that the coil assembly 3 is assembled to the hold case 1.

Therefore, in this second conventional terminal pin 3C and the connector structure 3E for drawing out the coil 3B to the outside on one side of the coil assembly 3 assembled to the hold case 1 are integrally formed. Therefore, the main circuit board and the head can be electrically connected to each other by simply assembling the connector structure 3E to the connector connected to the main circuit board, and thus the assembly can be greatly improved as compared with the first conventional example. It is.

However, as described above, the magnetic head for a video includes a coil assembly 3 having a rear core 4 assembled therein after inserting the front core 2 into a hold case 1 having a rear surface as an opening. When inserted into the coil assembly 3, the insertion position of the coil assembly 3 is not accurate, which causes a problem that the coil assembly 3 shakes inside the hold case 1.

In addition, an elastic member 5 is installed in order to prevent each component of the head installed inside the hold case 1 from being randomly detached, and the elastic member 5 is held by the hold case 1 during its installation. In this case, the elastic protrusion 5B integrally formed at the center of the elastic member 5 is in contact with the rear core 4 to generate elastic force. Therefore, when the elastic member 5 is strongly pressed, the elastic protrusion 5 The elastic force is lost by the shape deformation of 5B), and the compressive force of the front core 2 and the back core 4 is reduced.

This causes the magnetic path, which is the passage of the magnetic flux induced by the coil assembly 3, to reduce the characteristics of the head, and also to control the pressure input of the elastic member 5 is not easy, the external to the hold case 1 When an impact occurs, the fixing protrusion 5A of the elastic member 5 assembled in the fixing hole A of the hold case 1 may detach, and the connector may be connected to the terminal pin 3C inserted into the coil assembly 3. When soldering (6) to the main circuit board, the coil assembly (3) flows in the hold case (1) so that the connector (6) flows together to assemble a fixing structure for preventing the flow of the connector (6). In this case, there was a problem in that the cost increased due to the increase of assembly labor.

Meanwhile, after the front core 2 is inserted into the hold case 1 having the upper surface formed as an opening, when the coil assembly 3 with the rear core 4 assembled therein is inserted, the coil assembly ( 3) There is no structure for inserting and guiding the coil assembly 3 is not inserted in the correct position of the hold case 1, the assembly protrusion (1C) for assembling the coil assembly (3) to the hold case (1) is broken there is a problem.

In addition, when the coil assembly 3 is inserted into the holding case 1 into which the elastic member 5 is inserted, an elastic protrusion 5B integrally formed with the elastic member 5 is an assembly hole 3D of the coil assembly 3. In contact with the back core 4 assembled in the elastic force is generated.

Therefore, as shown in FIG. 5A, the back core 4 is inclined at the assembling hole 3D, so that one end of the back core 4 has an inner wall of the assembling hole 3D when the back core 4 is continuously inserted. As a result of scratching, the electrical properties become poor, and as shown in (b) of FIG. 5, this material scratched in the assembly hole 3D is accumulated between the front core 2 and the rear core 4, so that the front / rear core 2, (4) When the crimping force is reduced, the electromagnetic characteristics of the head are reduced, and the connector structure 3E is integrally formed on the upper surface of the coil assembly 5, so that the connection with the circuit board is possible only at the upper surface portion. The connection in wealth had a difficult problem.

The present invention has been made to solve such problems in the conventional magnetic head for video, and the object of the present invention is to form an uneven guide portion in the coil assembly and the hold case, respectively, to increase the assembly precision, And maintaining the elastic crimping force of the rear core uniformly and firmly holding the coil assembly by the support to improve the electrical characteristics of the product and to improve the magnetic head for the video, which can increase the reliability of the product.

1 is a perspective view showing a conventional magnetic head for video.

2 is an exploded perspective view showing a conventional magnetic head for video rotated 90 degrees.

3 is a cross-sectional view showing a conventional magnetic head for video.

4 is an exploded perspective view showing another embodiment of a conventional magnetic head for video.

5A and 5B are partial cross-sectional views showing the assembling operation of the video magnetic head in another embodiment of the conventional video magnetic head.

6 is an exploded perspective view showing a magnetic head for video of the present invention.

(A) of FIG. 7 is a detailed perspective view of part A of FIG.

(B) Part B detailed perspective view of FIG.

(A) and (b) of FIG. 8 are cross-sectional views showing the assembled state of the hold case and the coil assembly of the present invention.

* Explanation of symbols for the main parts of the drawings

11: hold case, 11A: guide,

11C: cutting groove, 11D: protrusion,

11E: fixing protrusion, 13: coil assembly,

13A: terminal pin, 13B: insertion hole,

13D: Jaw Jaw, 13C: Guide Groove

The video magnetic head of the present invention for achieving the above object is at least a coil assembly, a front core and a back core, the elastic member is mounted on the video magnetic head, the hold case protruding from the lower end One or two connector guides and a cutting groove and a fixing protrusion formed between the connector guides, wherein the connector guides form terminal pin guides on the inner side thereof, and the ends of the guides are smaller than the width T of the middle portion. A large protrusion is integrally formed, and the coil assembly forms an insertion hole and a locking jaw for receiving the protrusion and the fixing protrusion of the hold case and a guide groove for guiding the terminal pin guide. The terminal pin is turned into a space between the connector guides in a state where assembly is completed with the hold case. It is arranged to be deployed.

Therefore, the uneven guides are formed integrally with each of the hold case and the assembly, which are components of the video magnetic head, so that the fixing protrusion formed at the end of the hold case is assembled to the coil assembly when the coil assembly is inserted into the hold case. By assembling the coil assembly precisely at the assembly position of the hold case, the assembly precision and productivity are improved, and the compression of the front core and the back core can be enhanced by preventing the flow of the coil assembly by the accurate mutual assembly.

Hereinafter, with reference to the accompanying drawings will be described the configuration of the present invention and its effects. In order to avoid complications of the description, 10 unit codes are used for the same elements as the conventional description.

6 is an exploded perspective view showing a magnetic head for video of the present invention. FIG. 7A is a detailed perspective view of part A of FIG. 6. (B) Part B detailed perspective view of FIG. (A) and (b) of FIG. 8 are sectional views showing the assembling state of the hold case and the coil assembly of the present invention.

As shown in Figs. 6 to 8, the hold case 11 of the present invention has a terminal pin guide 11A for positioning and guiding the coil assembly 3 when the coil assembly 13 is inserted. ).

At the end of the hold case 11, a connector guide portion 11B is formed to facilitate mounting on the main circuit board. A cutting groove 11C is formed at a predetermined position of the connector guide portion 11B, and the protrusion 11D is integrally formed at a predetermined position on the upper end of the hold case 11 rather than the width T of the terminal pin guide 11A. And a fixing projection 11E is formed on the lower middle portion.

In addition, the coil assembly 13 forms an insertion hole 13B and a latching jaw 13D for receiving and engaging the projection 11D and the fixing projection 11E of the hold case 11. That is, the terminal pin 13A is protrudingly formed at the end of the coil assembly 13, and the insertion hole 13B is inserted in the upper portion of the terminal pin 13A such that the protrusion 11D formed inside the hold case 11 is inserted. Formed.

In addition, guide grooves 13C corresponding to the terminal pin guides 11A formed in the hold case 11 are formed on both side surfaces of the coil assembly 13.

With this configuration, when the coil assembly 13 is inserted into the hold case 11, the projection hole 11B is caught in the insertion hole 13B, and the hold case 13D formed at the lower end of the coil assembly 13 is held in the hold case. They are assembled together so that the fixing protrusion 11E of (11) may be caught.

Therefore, the coil assembly 13 is assembled to the hold case 11 by assembling these components. Reference numeral 12 denotes a front core, 12A a gap, 13E a coil bobbin, 13F a coil, 13G an assembly hole, 14 a rear core, 15 an elastic member, and 15A an elastic protrusion.

The assembling process of the magnetic head for video of the present invention configured as described above will be described. First, the front core 12 is inserted through the opening of the hold case 11.

Subsequently, the coil assembly 13 in which the coil 13F is wound is assembled to the coil bobbin 13E, and the terminal pin 13A is inserted to face downward. At this time, the guide grooves 13C formed on both sides of the coil assembly 13 are inserted into the terminal pin guides 11A formed in the hold case 11 and pressed downward.

The fitting of the guide groove 13C and the terminal pin guide 11A means that the coil assembly 13 is correctly inserted into the hold case 11 without swinging from side to side, and thus this is the coil assembly 13. ) And the hold case 11 are determined, and the position of the terminal pin 13A to be mounted on the substrate in the later step is accurately determined.

A process of mounting the coil assembly 13 to the hold case 11 will be described in more detail with reference to FIGS. 7 and 8.

When the coil assembly 13 is inserted into the hold case 11, the fixing guide 11E for assembling and supporting the connector guide portion 11B and the coil assembly 13 by the protrusion 11D formed at the lower end of the hold case 11. ) Is open in all directions. When the coil assembly 13 reaches a predetermined position, the connector guide part 11B and the fixing protrusion 11E formed on the hold case 11 are returned to their original positions by the elastic force, and the upper end of the terminal pin 13A of the coil assembly 13. The fixing protrusion 11E is caught by the protruding portion D formed at the lower portion, and the fixing protrusion 11E formed at the lower end of the hold case 11 is fitted to the locking jaw 13D.

Moreover, the projection part 11D which protrudes in the terminal pin guide 11A end inside the hold case 11 fits and is caught by the assembly hole 13B formed in the vicinity of the terminal pin 13A of the coil assembly 13. As shown in FIG.

Due to this multiple jamming, the coil assembly 13 is accurately set at a preset position in the hold case 11.

Subsequently, the back core 14 is inserted into the assembling hole 13G formed in the coil assembly 13, and the elastic member 15 is tightly inserted into the back core 14. That is, the elastic member 15 is inserted into one side of the terminal pin guide 11A formed in the hold case 11, and the rear core 14 is pressed against the front core 12.

When a current is applied to the terminal pin 13A of the coil assembly 13 of the video magnetic head assembled as described above, the current is applied to the coil 13F connected to the terminal pin 13A and assembled inside the coil 13F. The magnetic flux is induced in the formed rear core 14.

Therefore, the magnetic flux is applied to the front core 12 that is compressed to the rear core 14 by the elastic member 15.

At this time, for example, if the head of the present invention is a magnetic erasing head, the magnetic flux applied to the front core 12 is not continuously transmitted by the non-magnetic glass material formed in the longitudinal direction by the molten gap 12A, The signal recorded on the magnetic recording medium as a residual magnet is erased as it reaches the magnetic recording medium which is transmitted to the upper front of the head and travels on the magnetic head running surface.

The magnetic head for video of the present invention having such a structure is applied to magnetic heads of various sound apparatuses or video apparatuses, and is not limited to any particular home appliance.

As described above, the present invention has no problem of precision deterioration or component damage due to interference fitting in the rear opening type assembly of the head, and prevents the leaf spring from falling off as an elastic member that elastically presses the rear core, It prevents inaccuracy of positioning due to the loss of elastic force due to the excess, and it is possible to ensure accuracy when mounting on the board because it is a lower assembly type connector design method rather than the conventional upper assembly type, and the sequential of the front core, back core, elastic member It is possible to assemble and improve the assemblability, and to secure the insertion position when assembling the elastic member to exhibit a certain elastic force to obtain the electromagnetic characteristics, as in the conventional means (e.g. fixing resin) The coil assembly is not fixed in the Since the positions to secure the coil assembly by the engaging action to prevent the shaking motion, so that a waste of the material can not reduce the manufacturing cost.

As described above, according to the video magnetic head of the present invention, since uneven portions are formed integrally with each other in the hold case and the coil assembly, the insertion of the coil assembly is guided while fitting them together. It improves the reliability of the product by preventing the flow of the coil assembly by accurate assembly, and strengthens the pressing force of the front core and the back core, especially in the head of the connector integrated structure, the coil assembly during the primary assembly Due to the adoption of the guide means for guiding the head, it is possible to achieve the accuracy of the assembly of the head itself, and when the head of the present invention is mounted on the connector of the main circuit board secondarily, the connector of the board without a separate connection line By simply inserting into the module, as well as the hold case and coil assembly Since the WIP-like portions thereof are protruded to the outside of the holding case of not the assembled structure the coil assembly is correctly mounted at a predetermined position of the board connector, increasing the production line it has the effect of improving the reliability of our products.

Claims (1)

A video magnetic head comprising at least a coil assembly, a front core and a back core, and an elastic member mounted in a hold case, wherein the hold case is formed between two connector guides protruding from the lower end and the connector guides. And a cutting groove and a fixing protrusion, wherein the connector guide portion forms a terminal pin guide on an inner side thereof, and an end portion of the guide portion integrally forms a protrusion larger than the width T of the middle portion, and the coil assembly holds the hold. The insertion hole and the locking jaw for receiving the projection and the fixing projection of the case and the locking jaw and the guide groove for guiding the terminal pin guide are formed, and the terminal pin guides the connector in the state of being assembled with the hold case. A magnetic head for video, characterized by being protruded into the space between the parts.