KR101108204B1 - A bobbin case for electro magnetic interference - Google Patents

Abstract

The present invention relates to a bobbin case for an EM (Electro Magnetic Interference) to reduce the harmful electromagnetic interference generated from the power cable by accommodating the core in the inner space of the enclosure and wound around the power cable.
The present invention, the core is built in both case housings and the two case housings are connected to the hinge portion of one side and the other side is provided with a male and female locking means, the other side of the case enclosure is folded to open and close each other the bobbin case for EM The hinge portion of the bobbin case for EM eye, characterized in that the first bent portion and the second bent portion formed in a thickness relatively thinner than the other portion forming the hinge portion body at the portion connected to the case housing on both sides to provide.
The hinge portion body is characterized in that the protruding ribs in the longitudinal direction protruding in the direction of the inner case housing space is formed between the first bent portion and the second bent portion.
In addition, the groove formed between the hinge portion and the case housings between the first and second bent portions and the case housing is characterized in that the structure is formed to extend deep in the case housing lower direction.

Description

A bobbin case for electro magnetic interference

The present invention relates to an bobbin case for EM (EMI), and more specifically, to receive harmful core interference from an electric power cable by accommodating a core in an inner space of a housing and winding the power cable. It is about a bobbin case.

In general, according to the operating characteristics of electronic products such as TV computers, the current flow is continuously changed for more than or less than usec according to the frequency generated by the internal semiconductor active elements and the oscillation circuit. In conjunction with the change, the power supply unit continues to change the power consumption. This becomes a factor of generating electromagnetic waves in the power supply section, and a wire (power cable), which is a means for supplying power to the power supply section, is known as a location for generating electromagnetic waves as a role of an antenna. Furthermore, the power cable generates a frequency of the power frequency 60 Hz, the second harmonic in the unit of multiples thereof, and the third harmonic to the nth harmonic. These harmonics are combined with the electromagnetic waves generated by the rapid change in power consumption of the electronic products described above to generate another electromagnetic wave, such that very high wavelength harmful electromagnetic interference is generated in the power cable.

In order to reduce such harmful electromagnetic interference, EM Bobbin products are used.

Referring to the general configuration of the bobbin product for EMB to which the present invention is applied, as shown in Figures 1a, 1b, 2, the case housing 10 for receiving the core 14a, 14b in the inner space is a groove (15a) By allowing the wire 20 (power cable) to be wound once, such as a coil, through the wire hole 15 formed by), it is possible to filter the electromagnetic waves emitted through the wire 20.

The case housing 10 is divided into an upper case housing 10a and a lower case housing 10b so as to wind the wire 20 once, and one side is connected to the hinge portion 30, and the other side is separated and coupled. The case housings (10a, 10b) is provided with a pair of male and female locking means (16a, 16b) to maintain the state coupled to each other, the electric current flowing through the wire by winding the wire 20 The cores 14a and 14b for inducing are embedded in and fixed to the upper and lower case housings 10a and 10b, respectively, as shown in FIG.

The folding rotation of the two case enclosures 10a and 10b is achieved by the hinge portion 30 provided between the two case enclosures.

The EM bobbin case of the present invention and the conventional EM bobbin case have a remarkable difference in the hinge portion 30 thereof. (In the present specification, the conventional hinge means is referred to by the reference numeral 30 and the present invention is referred to by reference numeral 300 for convenience in order to distinguish the prior art and the present invention.)

The hinge portion 30 provided in the conventional bobbin case for EM eye has a structure of being injected with a constant thin thickness as shown in Figs. 3a and 3b, both sides of the case (10a, 10b) is completely open It is in the form of a straight line as shown in 3a, but in a fully closed state, as shown in FIG.

Thus, the hinge part 11 injected in the form of a straight line in the state in which both case housings 10a and 10b are opened is stressed in the outer part, in particular, due to the difference in internal and external tensile forces (tension and tension) in the process of bending in a semicircular shape. There was a problem that the cracks are generated as a result of product concentration. In addition, the hinge part that protrudes in a semicircle to the outside is concentrated in the center of the hinge part, and a large tension is applied to the outer part so that a defect appears in the inspection after injection molding or is assembled and logistics into a product, or in the process of being used. There was also a fear of a defect in physical contact with foreign matters, causing damage to the hinge. In addition, since the hinge portion is concentrated in one place, a narrow space is increased in order to maintain the length of the hinge portion in the mold structure during injection molding, so that a defect phenomenon in which the hinge portion is whitened may occur.

The present invention, which is devised to solve such a problem that product defects are caused, prevents the hinge portion from protruding while distributing the tensile force received from the hinge portion, and also allows frequent rotational movement to open and close both case enclosures. It is an object of the present invention to provide a bobbin case for EM to prevent damage caused by the tensile force in the branch.

The present invention for achieving the above object,

In the bobbin case for EM eye which is made of a two-side case housing in which the core is inherent, wherein both side case housing is connected to the hinge portion and the other side is provided with a male and female locking means, the case housing is folded to open and close each other,

The hinge portion provides a bobbin case for an EMS eye, characterized in that the first bent portion and the second bent portion formed in a thickness relatively thinner than other portions forming the hinge portion body at the portion connected to the case housing on both sides.

In the above-described configuration, the hinge portion body is characterized in that the protruding ribs in the longitudinal direction protruding in the direction of the inner case housing space is formed between the first bent portion and the second bent portion.

In the above-described configuration, since the grooves formed between the hinge portion and the case housings between the first and second bent portions and the case housing are formed to extend deeply in the case housing lower side, both case cases It is characterized in that it is possible to further disperse the stress applied to the first and second bent portion when rotating for the opening and closing of the.

The present invention configured as described above provides two hinge parts so that the stresses previously concentrated on one hinge part can be dispersed in two places or distributed to two parts extending from two parts, thereby deforming and cracking the hinge part. There is an effect that can prevent damage to the back.

Figure 1a and Figure 1b is a perspective view for explaining the use of the bobbin case for EM eye to which the present invention is applied,
Figure 2 is a perspective view of the open state showing the structure of a bobbin case for a conventional EMM,
Figure 3a and Figure 3b is a front sectional view showing a state of opening and closing the bobbin case for conventional EM eye,
4 is an exploded perspective view of the EM bobbin case according to the present invention by opening it;
5A and 5B are perspective views showing the hinge portion as a partial cross section in the open and closed states of the case housing of the present invention, respectively;
6A and 6B are side cross-sectional views of FIGS. 5A and 5B respectively seen from the front;
7 is a partial cross-sectional view showing various embodiments of the hinge portion 300 according to the present invention.

The present invention will be described in more detail as follows.

As shown in FIGS. 1A and 1B, the bobbin case for EM eye to which the present invention is applied has the same usage as the conventional bobbin case for EM eye, using the wound wire 20.

The description of the hinge portion 300, which is a large feature of the present invention, will be described with reference to FIGS.

4 is an exploded perspective view of the bobbin case for an EMS eye according to the present invention. Referring to this, spaces in which the cores 14a and 14b are provided are provided inside the upper and lower case housings 10a and 10b. Wedge protrusions 112 are provided to insert and fix the cores 14a and 14b.

5A and 5B are perspective views showing the hinge portion as a partial cross section in the open and closed states of the case housing of the present invention, respectively, and FIGS. 6A and 6B are side cross-sectional views of FIGS. 5A and 5B respectively seen from the front.

Referring to the drawings of FIGS. 4 to 6B, the present invention is composed of both case housings 10a and 10b in which cores 14a and 14b are embedded, and both side case housings 10a and 10b have hinge portions 300. In the bobbin case for EM eye which is connected to the structure and the other side is provided with a male and female locking means (16a, 16b) can be opened and closed on both sides of the case housing (10a, 10b),

The hinge portion 300 has a first bent portion (310a) and the first thickness is formed in a relatively thin thickness than the other portion forming the hinge portion 300 body at the portion connected to the both case housing (10a, 10b) It is characterized by having two hinge axes of the two bends 310b.

The bobbin case of the present invention configured as described above is injection molded from a synthetic resin as in the prior art, and the first curved portion and the second curved portion function as hinge shafts by a thin thickness. In the injection-molded state, both case housings 10a and 10b are open, and thus, the bent portions 310a and 310b are straightened when the both case housings 10a and 10b are closed to each other. As the stress is concentrated on the two bent portions 310a and 310b, a slight restoring force acts in the opening direction. The slight restoring force can be easily limited by the locking means 16a, 16b so that the bobbin case 10 can remain closed.

The hinge part 300 body is integrally formed with a protruding rib 320 extending in the direction of the inner space of the case between the first bend 310a and the second bend 310b. The portion of the hinge portion 300 with the protruding ribs 320 does not cause bending even when folding due to the opening and closing of both sides of the case to distribute the stress to the bent portions 310a and 310b on both sides of the protruding ribs 320. As the stress is dispersed in this way, the stress concentration can be reduced in half as compared to the conventional method.

In addition, the present invention, the groove 330 formed between the both case housing (10a, 10b) and the first and second bent portion (310a, 310b) extends deeply in the case downward direction (10a, 10b) It is formed to be. Accordingly, the entire hinge portion 300 forms a curved 'ㄷ' shape. The structure of the present invention, the groove 330 in the bent portion (310a, 310b) due to the structure is formed by deeply forming the groove 330 in a straight line from the bent portion (310a, 310b) that is a rotating part that bends and unfolds the action. The hinge portion 300 body between the ends serves as a leaf spring to act to further distribute the stress applied to the two bent portions 310a and 310b.

In addition, the connection portion extending from the end of the groove 330 to the hinge part 300 body forms an inclined surface 332 of diagonal lines so as to obliquely reinforce the thickness so as to prevent bending of the corresponding part.

On the other hand, Figure 7 is a partial cross-sectional view showing various embodiments of the hinge portion 300 according to the present invention.

The structure of the hinge part 300 shown in (a) of FIG. 7 includes all the configurations of the above-described embodiment.

The structure of the hinge part 300 shown in (b) of FIG. 7 shows an embodiment of the present invention having a configuration of the present invention except for a structure in which the groove 330 is deeply formed among the above-described embodiments. According to the results of manufacturing and testing, a defect in which a slight whitening phenomenon occurs in the hinge part 300 is generated, but it can be confirmed that stress concentration is reduced compared to when one hinge part is configured as in the prior art.

The structure of the hinge portion 300 shown in (C) of FIG. 7 is concentrated except for the structure in which the groove 300 is deeply formed in the above-described embodiment, and the stress concentrating while smoothing the bending of both bent portions 310a and 310b. The part is intended to be distributed as widely as the hinge part 30, which was one of the conventional bobbin cases, and the inventors manufactured and inspected the bobbin case product as described above. Similarly, crack incidence was high. This will be the evidence for concentrating the hinge portion 300 to both side bends 310a and 310b as in the present invention to obtain an excellent effect in reducing the incidence of cracking.

10a, 10b: case enclosure
14a, 14b: core
16a, 16b: locking means
20: wire
300: hinge part
310a, 310b: bend
320: protruding rib
330: home
332 slope

Claims (3)

It consists of both case housing (10a, 10b) in which the core (14a, 14b) is embedded, the both case housing (10a, 10b) is one side is connected to the hinge portion 300 and the other side is male and female locking means (16a, 16b) In the bobbin case for EM eye having a structure in which both case housing (10a, 10b) can be opened and closed mutually,
The hinge portion 300 has a first bent portion (310a) and the first thickness is formed in a relatively thin thickness than the other portion forming the hinge portion 300 body at the portion connected to the both case housing (10a, 10b) 2 to have two hinge axes of the bent portion (310b),
The hinge part 300 body is characterized in that the elongated protruding rib 320 protruding in the direction of the inner space of the case between the first bend 310a and the second bend 310b is formed integrally Bobbin case.
The method of claim 1, wherein the grooves 330 formed between the case housing (10a, 10b) and the first and second bent portions (310a, 310b) of the both sides so as to extend deeply downward to the case housing (10a, 10b) It is formed, the bobbin case for the EM eye, characterized in that the obliquely reinforced thickness to form an inclined surface 332 of the diagonal line in the connecting portion extending from the end of the groove 330 to the hinge portion 300 body.
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