JPH069105U - Substrate type noise filter - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a board-type noise filter that can be firmly fixed to a board with a small number of mounting steps. [Structure] In the insulating base 22 with legs of the substrate type noise filter of the present invention, a plate-shaped leg portion 22a and an insulating terminal base portion 22a-1 are integrally formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a noise filter, and more particularly to a substrate type noise filter in which an insulating base having a coil and an insulating terminal plate having a plate terminal connected to the coil are mounted on a printed wiring board.

[0002]

[Prior art]

 This type of board-type noise filter is an electronic component that is mounted on large home appliances such as air conditioners. Refer to Fig. 3 to reduce the allowable installation area. An insulating base 12, a pair of insulating terminal boards 13, and a plurality of small circuit elements 14 are mounted on the board 11. The insulating base 12 is provided with a substantially rectangular flat portion, and square leg portions 12a having longitudinal grooves 12-1 at four corners of the flat portion extend vertically. On the insulating base 12, a toroidal common mode choke coil (hereinafter referred to as a coil) 15 having two winding ends wound around a toroidal core and having four winding ends is mounted. A pair of insulating terminal plates 13 are attached near both short sides of the board 11, and each insulating terminal plate 13 has three plate terminals 13a having through holes for connecting to a line or ground. It is attached along the side. The end portion (lower end portion) of the plate terminal 13a to which the plate terminal 13a is attached is a wedge-shaped protrusion (not shown). A plurality of small circuit elements 14 are mounted on the central portion of the substrate 11 by capacitors 14a and 14b, a surge absorber 14c and the like.

A conventional procedure for assembling the substrate type noise filter will be described. First, a plurality of small circuit elements 14 are mounted on the board 11, and the ends of the lead wires are bent on the back surface of the board 11. On the other hand, in the coil 15, four winding end portions are respectively extended by a predetermined length in parallel with the axial direction of the center of the toroidal core, and the four winding end portions are preliminarily subjected to preliminary padding.

Next, the coil 15 is positioned and placed between the pair of projecting pieces 12 b on the insulating base 12. Each of the pre-soldered winding ends is housed in each of the longitudinal grooves 12-1 of the square leg 12a, and the winding end is projected from the lower end of the lower leg 12a of the square leg 12a. While maintaining this state, the coil 15 is inserted into the fitting holes (not shown) of the substrate 11 and the winding ends are respectively bent, and the coil 15 is bent on the back surface of the substrate 11. The insulating terminal plate 13 is bite-stopped by inserting the wedge-shaped projecting piece of the plate terminal 13a into the eyelet of the substrate 11.

[0005]

[Problems to be solved by the device]

 However, in the conventional board-type noise filter, in order to mount the coil on the insulating base, the winding end of the coil is grasped on the back side of the board 1 and attached to the wedge-shaped protruding piece of the insulating terminal board. ing. This mounting work not only requires a lot of man-hours, but also has a drawback that it cannot be firmly fixed to the substrate.

Therefore, a technical problem of the present invention is to obtain a substrate type noise filter which can be firmly fixed to a substrate with a small number of steps for attaching a coil.

[0007]

[Means for Solving the Problems]

 According to the present invention, in a substrate type noise filter in which an insulating base having a flat portion on which a coil is mounted is mounted on a substrate, the insulating base includes a leg portion and an insulating terminal base portion for mounting plate terminals. A board-type noise filter is obtained, which is integrally formed, and the insulated terminal block portion is provided with small legs so as to form a lower part of an eave, and is attached on the substrate by the small legs.

[0008]

[Action]

 Since the insulating base is constructed integrally with the insulating terminal block, the insulating base is firmly fixed and attached to the board by the small legs of the insulating terminal block. Moreover, when the coil is mounted on the flat part of the insulating table and the coil winding is connected to the plate terminal of the insulating terminal block part, the coil winding ends start from the four corners of the flat part and under the eaves of the small legs of the terminal block part. You can easily work on the upper surface of the board by tying it to the board terminals and soldering.

[0009]

【Example】

 A substrate type noise filter according to an embodiment of the present invention will be described with reference to the drawings.

Referring to FIGS. 1 and 2, this board-type noise filter has a printed wiring board (hereinafter referred to as a board) 21 on which an insulating base 22 with legs and a plurality of small circuit elements 14 are mounted. ing. The difference from the conventional example is the insulating base 22 with legs and the plate terminal 31 for grounding.

The legged insulating table 22 has a substantially rectangular flat portion. The flat portion has vertical grooves 22-1 at the four corners on the long side, and the plate legs 22a extend vertically from both sides on the short side of the flat portion. Projecting pieces 22b are respectively provided at the centers of the short sides of the flat portions, and positioning pieces 22c for positioning the coil 15 are provided at the centers.

The plate-shaped leg portion 22a is provided with an insulating terminal block portion 22a-1 to which a pair of sword-crown-shaped line plate terminals 23 are mounted. The insulating terminal block portion 22a-1 is provided with a pair of elongated holes 22a-1a, which are holes for inserting the pair of line plate terminals 23. The insulating terminal block portion 22a-1 is provided with small legs 22a-1c at the lower part, and is attached to the substrate 21 by fitting or bonding with the small legs 22a-1c. The small legs 22a-1c have side portions formed as eaves lower portions 22a-1b. The eaves lower portions 22a-1b are formed by cutting out the lower corners of the insulating terminal block portion 22a-1 in a rectangular shape. The plate terminal 23 for line has one leg 23a at the tip and one arm 23b at the side.

A procedure for assembling the substrate type noise filter according to the embodiment of the present invention will be described. First, a plurality of small circuit elements 14 are mounted on the board 21, and the ends of the lead wires are bent on the back surface of the board 21. Further, the ground plate terminal 31 is directly press-fitted to the corner of the substrate 21 in the vicinity of the plate leg 22a.

On the other hand, in the coil 15, four winding end portions are respectively extended by a predetermined length in parallel with the axial direction of the center of the toroidal core, and the four winding end portions are preliminarily soldered in advance. .

Next, the coil 15 is positioned and mounted between the pair of projecting pieces 22b on the flat portion of the legged insulating base 22 so as to be aligned with the positioning projecting piece 22c. Each of the pre-soldered winding ends is led out downward through the vertical groove 22-1. The coil 15 is bent at the corners of the eaves lower portions 22a-1b while contacting the winding ends with the inner surfaces of the plate-shaped leg portions 22a, respectively.

After that, the stems of the line plate terminals 23 are inserted into the elongated holes 22a-1a, respectively. In this case, one leg 23a of the line plate terminal 23 is inserted into the eyelet of the board 21, and at the same time, one arm 23b of the side of the line board terminal 23 projects to the eaves lower portion 22a-1b on the board 21. Appears. In the lower eaves 22a-1b, the winding ends of the coil 15 described above are entangled with the tip of the one arm 23b and then soldered to the tip of the one arm 23b. Further, since the tip of the one leg 23a of the line plate terminal 23 projects below the substrate 21, the tip is slightly bent.

Finally, the substrate type noise filter of the present invention is obtained by applying immersion soldering to the back surface of the substrate 21.

Since the flat portion of the above-described insulating base 22 with legs is integral with the insulating terminal base portion 22a-1, it can be molded with a smaller amount of resin than that of a conventional insulating terminal base portion, and thus can be molded more than the conventional one. An inexpensive substrate type noise filter can be obtained.

[0019]

[Effect of device]

 As described above, according to the present invention, since the insulating base with legs is integrally formed with the insulating terminal block portion, it is possible to mold with a smaller amount of resin than that of the conventional insulating terminal block portion. A cheap substrate type noise filter can be obtained. Moreover, the insulated terminal block is attached to the board with a small leg, and the winding end of the coil can be entangled with the tip of the line plate terminal under the eaves of the insulated terminal block for connection work. As a result, the coil can be firmly locked to the insulation base with legs. Moreover, not only does the conventional stop on the board for coil winding adjustment be unnecessary, but it is no longer necessary to consider the current capacity of the board coil wiring, making design and manufacturing easier than before. It was

Therefore, it is possible to obtain an effect that the cost is lower than the conventional one, the number of steps of the mounting work is small, and the substrate can be firmly fixed.

[Brief description of drawings]

FIG. 1 is a perspective view of a substrate type noise filter according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a main part of FIG.

FIG. 3 is a perspective view of a conventional example of a substrate type noise filter.

[Explanation of symbols]

 11 Board 12 Insulation Stand 12-1 Longitudinal Groove 12a Square Leg 13 Insulation Terminal Board 14 Plural Small Circuit Elements 15 Coil 21 Board 22 Insulation Stand with 22a Plate Leg 22a-1 Insulation Terminal Block 22a-1b Lower eaves 22a-1c Small legs 22b Plate leg 23 Line plate terminal 31 Ground plate terminal

Claims (1)

[Scope of utility model registration request] 1. A substrate type noise filter comprising a substrate and an insulating base having a flat portion on which a coil is mounted, wherein the insulating base is integrally formed with a leg portion and an insulating terminal base portion for mounting a plate terminal. A board-type noise filter, wherein the insulated terminal block portion is provided with a small leg so as to form a lower part of an eave, and is mounted on the substrate by the small leg.