JPH0563011U - Noise filter - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a noise filter having a structure that can be attached to a case with one touch. [Structure] A flange provided on an outer peripheral portion of the noise filter that terminates insertion of the noise filter into a mounting hole opened on the case side by contact with an outer surface of the case, and a thickness of the flange approximately equal to the thickness of the case. Are provided apart from each other in the insertion direction side, and when the noise filter is inserted, the elastic filter passes through the gap formed by the noise filter and the mounting hole while returning to the original shape when the insertion is completed. And a locking piece for preventing movement of the in the opposite direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a noise filter, and more particularly to a noise filter that can be easily and surely attached to a case to which the noise filter should be attached.

[0002]

[Prior Art]

 A noise filter that absorbs noise on a power line and a signal line is provided in an electronic device used in recent years. The external appearance of a conventionally used noise filter is as shown in FIG. 7. When mounting this, the mounting hole of the noise filter and the mounting hole provided on the case are aligned and screwed.

[0003]

[Problems to be solved by the device]

 However, in the conventional noise filter having such a structure, it has to be created in each manufacturing process so that the positions of the holes provided on the flange and the positions of the holes provided on the case side coincide with each other. Therefore, it is very difficult to improve both the productivity and the yield because the processing accuracy is required to be high. In addition, since the noise filter is attached to the case by screws, automation is extremely difficult and requires manual work, so productivity cannot be said to be very good. In addition, the case needs a space to accommodate the flange of the noise filter, which hinders miniaturization and lacks flexibility in terms of design.

The present invention has been made to solve the above-mentioned various conventional problems, and an object thereof is to provide a noise filter having a structure that can be attached to a case with one touch. And

[0005]

[Means for Solving the Problems]

 The present invention for achieving the above object includes a flange provided on an outer peripheral portion of a noise filter, which ends insertion of a noise filter into a mounting hole opened on the case side by contact with an outer surface of the case, and It is provided on the insertion side by approximately the thickness of the case from the flange, and elastically deforms and passes through the gap formed by the noise filter and the mounting hole when the noise filter is inserted. And a locking piece that prevents the noise filter from moving in the opposite insertion direction, and the locking is performed when the insertion of the noise filter is completed by the flange contacting the outer surface of the case. The piece has finished passing through the gap formed by the noise filter and the mounting hole and has returned to its original shape, By di the locking piece, characterized in that the noise filter is pinch the casing and to attach to the case.

[0006]

[Action]

 In the present invention thus configured, the noise filter can be securely attached to the case only by inserting the noise filter from the insertion direction into the attachment hole opened in the case. Therefore, the productivity in mass production will be greatly improved. In addition, since it is not necessary to use screws or the like, it is possible to reduce the size.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing a specific configuration of a noise filter according to an embodiment of the present invention.

The noise filter according to the present invention comprises an input socket 1, an insulating base 2, an insulating top cover 3, a metal outer shell 4, an L-shaped long ground terminal 5, a short output terminal 6, a ground straddle terminal 7, an elastic piece 8 and an elastic piece 8. It is composed of various circuit components. A flange is formed on the front side of the input socket 1 to prevent the noise filter from moving in the insertion direction when it is attached to a case or the like. Further, socket pins 123 that come into contact with the L-shaped long ground terminal 5 and socket pins 121 and 122 that come into contact with the two short output terminals 6 are provided on the rear surface side. The socket pin 123 has a T-shape as shown in the figure. The stopper plate 13 is provided to ensure the mounting of the insulating base 2 to the input socket 1. The slanting block 11 has a resilient force in the protruding direction and can be pushed in. The diagonal block 11 engages with the engaging hole 41 provided in the metal outer shell 4 so that the input socket 1 and the metal outer shell 4 can be attached with one touch. The diagonal block 11 and the engaging hole 41 are provided on both sides of the input socket 1 and the metal outer shell 4, respectively.

The insulating base 2 has a vertical accommodation groove 21 for accommodating the ground straddle terminal 7, an accommodation opening 22 for introducing one end of the short output terminal 6 and a horizontal accommodation for introducing one end of the L-shaped long ground terminal 5. Each groove 23 is formed. The engagement groove 51 formed in the L-shaped long ground terminal is engaged with the socket pin 123. Since the tip portion of the socket pin 123 has a T shape as shown in the figure, the L-type long ground terminal 5 is not easily disengaged by this engagement. Of course, this engaged portion is later soldered to improve the reliability of electrical continuity. Further, the portion of the short input terminal 6 where the hole is opened is inserted into the accommodation opening 22. In this state, one ends of the capacitor 93 and the coil 94 are soldered to the short output terminal 6, and the other ends of the coils 94 are soldered to the socket pins 121 and 122, respectively. Then, when the insulating base 2 is inserted between the stopper plates 13 of the input socket 1 in this state, the state shown in FIG. 2 is obtained. That is, with the engagement groove 51 of the L-shaped long ground terminal 5 engaged with the socket pin 123, one end thereof is inserted into the horizontal accommodation groove 23 and exposed to the outside. At the same time, one end of the short output terminal 6 is exposed outside while being inserted into the accommodation opening 22.

In this state, both ends of the resistor 91 attached adjacent to the capacitor 92 are placed on the socket pins 121 and 122, and these terminals are soldered to the socket pins 121 and 122. Then, the grounding electrode 7 is housed in the vertical housing groove 21 by placing the mounting portion 71 on the upper side of the vertical housing groove 21, and the contact portion 72 is inserted into the long hole portion 52 of the L-type long ground terminal. Then, the insulating upper lid 3 is placed on the insulating base 2 so as to cover it.

A cutout 42 for attaching a hinge-shaped elastic piece 8 is provided on both upper and lower surfaces of the metal outer shell 4, and a housing opening 22 and an elongated hole for the L-shaped long ground terminal 5 are provided on a rear end surface thereof. A T-shaped opening 44 through which the portion 52 passes is opened. With such a structure, when the metal outer shell 4 is slid so as to accommodate the insulating base 2 and the flange portion of the input socket 1 inside, the slanted block 11 is engaged with the engaging hole 41. The integrated noise filter as shown in FIG. 3 is completed. At this time, the ground straddling electrode engaged with the elongated hole portion 52 acts so as to press the upper surface of the metal outer shell 4 inserted into the insulating base 2 with the mounting portion 71, and the stopper plate 13 is attached to the insulating base 2. Since both sides are pressed firmly, the integration will be firm. Similarly, the elastic piece 8 attached to the notch 42 is also clamped by the close contact state with the metal outer shell 4 of the insulating upper lid 3 so that the elastic piece 8 is not easily detached from the notch 42. .. After the assembly of the noise filter is completed in the state as shown in FIG. 3, the end of the L-shaped long grounding end 5 protruding from the T-shaped opening 44 and the contact part 72 of the ground straddle electrode 7 are made of metal. Solder with shell 4. As a result, the ground circuit is formed and mechanically fixed to the metal outer shell 4.

FIG. 4 is a diagram showing a state in which the noise filter configured as described above is attached to a case that constitutes an electrical device. As shown in the figure, the noise filter has a case inside and outside with a flange provided on one side of the noise filter and an elastic piece 8 provided away from the flange by approximately the thickness of the case in the insertion direction. Therefore, the noise filter is attached to the case by pinching it. The shape of the elastic piece 8 is as shown in FIG. One side of the elastic piece 8 is provided with a slanted convex portion 81 inclined toward both sides, and one side of the slanted convex portion 81 has an arc shape A 1. This arcuate shape A realizes good workability during assembly and improvement in mounting strength when the noise filter is mounted on the case. An L-shaped lower concave portion 82 is formed on the other side, and a beveled portion B is formed between the L-shaped lower concave portion 82 and the oblique convex portion 81. Due to this shape, when it is fitted into the notch 42 provided in the metal outer shell 4, the slanted convex portion 81 is automatically brought into close contact with the metal outer shell 4 in a flat manner. The end of the L-shaped lower concave portion 82 is formed so as to be bent back at an angle C which is on the upper side. The L-shaped lower recess 82 allows the elastic piece 8 to be more firmly positioned between the metal outer shell 4 and the insulating base 2 and the upper lid 3.

A mounting hole for mounting the noise filter is provided in the case. When mounting the case in this mounting hole, the noise filter may be inserted into this hole from the rear end. As this insertion proceeds, the elastic piece 8 elastically deforms and passes through the gap formed by the noise filter and the mounting hole, and this insertion ends when the flange contacts the case. It will be. At the end of this insertion, the elastic piece 8 returns to its original shape, and the noise filter is attached to the case by sandwiching the case with the flange and the locking piece.

Since the elastic piece 8 is formed with the slanted convex portion 81, when the slanted convex portion 81 passes through the mounting hole of the case and returns to the original shape, as shown in FIG. The open wing shape further increases the reliability of mounting.

The assembly diagram shown in FIG. 5 shows another embodiment of the present invention. In this case, although the ground straddle electrode 7 is not used, the lead wire of the capacitor 93 is as shown in the drawing. It is connected to the L-type long ground terminal 5 by soldering it from below. Therefore, the L-type long ground terminal 53 can be omitted.

[0016]

[Effect of the device]

 As is clear from the above description, according to the present invention, since the noise filter can be attached to the case with one touch, the productivity can be improved, and the space for attachment can be reduced. Since it is not necessary, the case can be made smaller. In addition, the production yield can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a specific configuration of a noise filter according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an assembly process of the noise filter shown in FIG.

3 is an external view of the noise filter shown in FIG. 1 after assembly.

FIG. 4 is a diagram for explaining a case where the noise filter shown in FIG. 3 is attached to a case.

FIG. 5 is an exploded perspective view showing a specific configuration of a noise filter according to another embodiment of the present invention.

FIG. 6 is a view showing a concrete shape of a locking piece used in the noise filter of the present invention.

FIG. 7 is a diagram for explaining a case where a conventional noise filter is attached to a case.

[Explanation of symbols]

 1 ... Input socket 2 ... Insulation base 3 ... Insulation top cover 4 ... Metal outer shell 5 ... L-shaped long ground terminal 6 ... Short output terminal 7 ... Ground straddle terminal 8 ... Elastic piece

Claims (1)

[Scope of utility model registration request] 1. A flange provided on an outer peripheral portion of the noise filter, which terminates insertion of the noise filter into a mounting hole opened on the case side by contact with an outer surface of the case, and from the flange to almost the case. It is provided on the insertion direction side by the thickness, and when the noise filter is inserted, it elastically deforms and passes through the gap formed by the noise filter and the mounting hole, and at the end of the insertion, returns to the original shape and A locking piece that prevents movement of the noise filter in the opposite insertion direction is provided, and when the insertion of the noise filter is completed by the flange coming into contact with the outer surface of the case, the locking piece and the noise filter are provided. After passing through the gap formed by the mounting hole and returning to the original shape, the flange and the locking piece cause the case to Noise filter, characterized in that to attach the noise filter to the case by pinch the scan.