JPH02114604A - Electronic component - Google Patents

Abstract

PURPOSE:To conduct a rotational adjustment easily by a method wherein a substrate is integrally molded in a case having an aperture in the upper surface, a mounting base provided with a control grip and a brush in the above- mentioned aperture is placed on the stepped part of the case, and a cavity, having a slanting surface formed by bending the wall of the case is formed. CONSTITUTION:A case 18 has a stepped part 22, a protruding wall 23 and an aperture on the upper part; and a resistance film 12 and a contact part 21 are exposed on the bottom part of the case 18. On the above-mentioned aperture part, a mounting base 24, on which a control grip 25 provided on the upper surface and a brush 25 provided on the lower surface are integrally fixed in such a manner that they can be rotated simultaneously, is placed on the case 18. The mounting base 24 is fixed by providing a gap 30 on the outer circumference of the control grip 25 in the state wherein a cavity, having an inclined surface formed by bending the entire or a part of the wall 23 provided on the upper part of the case 18, is formed. Also, the supporting force against the pushing force of a driver can be improved by providing a bent part 32 on the outer circumference of the mounting base 24.

Description

[Detailed description of the invention] Industrial applications The present invention relates to electronic components used in electronic equipment.

Conventional technology The conventional technology will be explained using a variable resistor as an example.

FIG. 2 is a side sectional view of the variable resistor. According to the same figure,
A terminal plate 3 is soldered to a resistor board 1 on which a resistor film 2 is printed and applied, and a fixed shaft 6 is inserted into the center hole of the resistor board 1 from below. This work in progress is insert molded in a resin mold to form the case 8. This case 8 has an opening at the top, and the resistance film 2 and the fixed shaft 5 are exposed at the bottom of the case. A brush 7 and a knob 6 each having a center hole are inserted into the opening of the case 8 from above, and the end of the fixed shaft 6 exposed from the center hole of the knob 6 is pinched. Further, the terminal 3 inserted into the case 8 is cut to an appropriate length and bent at the bottom of the case 8. The variable resistor thus formed is manufactured by applying an adhesive such as silicone to the upper surface of the case 8 to form an adhesive film 9 to prevent lumps, 7 lux during soldering, and the inside of the solder. In order to prevent inflow, a completely sealed variable resistor was formed.

In this way, after soldering and mounting on the printed circuit board, the adjustment screwdriver is inserted into the knob adjustment groove 6a by breaking through the adhesive film 9, and the knob 6 is rotated. The resistance value was adjusted by sliding it on the top.

Problems to be Solved by the Invention However, in the method of adjusting the conventional electronic components by breaking through a sealing film such as an adhesive film, fragments are generated when the sealing film is broken through and rotated, causing damage to the electronic device and the like. If the chips were scattered inside the module, there was a possibility of quality concerns, as they could cause negative effects such as poor contact on other components such as switches.

Additionally, the conventional method of applying adhesive to the top surface of the knob (or the top surface of the case) to form a sealing film requires extra force to break or push the sealing film away when inserting a screwdriver. There was a problem in that it was necessary and difficult to adjust.

In addition, with the conventional method of applying adhesive to the top surface of the knob (currently, the top surface of the case) to form a sealing film, there is no part to guide the screwdriver into the knob adjustment groove, so there is no place to set the screwdriver. The problem was that it was difficult to find.

Means for Solving the Problems The present invention provides a mounting plate in which an operating knob and a brush are integrally attached, and when the mounting plate is mounted on a case, and the upper wall of the case is bent and fixed, the wall is shaped like a recess with an inclined surface. It has a configuration in which it is bent.

Function As described above, by not forming a sealing membrane on the driver groove of the operating knob, membrane fragments are not generated during rotation operation, and adjustments can be made easily without the need to break the sealing membrane. In addition, the operation knob is passed through in the length direction, and the upper part of the case is formed into a recess with a slope, so the driver is guided by the slope, making it easy to set the screwdriver in the driver groove of the knob. It is something.

Embodiment FIG. 1 is a side sectional view of a variable resistor which is an embodiment of the electronic component of the present invention. According to the figure, a terminal 13 is connected and fixed by soldering or the like to a resistor board 11 on which a resistor film 12 is printed and applied, and a hole provided in the center of the resistor board 11 is inserted into the terminal 20 from the back side of the resistor board 11. Contact part 2 with a protruding shape that is processed or connected by combining separate parts
The case 18 is formed by insert molding this unfinished part in a resin mold. This case 18 has a stepped portion 22, a protruding wall 23, and an opening at the upper side. At the bottom of the case 18, the resistive film 12 and the contact portion 21 are exposed. A mounting plate 2 has an operating knob 26 on the upper surface and a brush 26 on the lower surface fixedly integrated into this opening so that the operating knob 26 and the brush 26 can be rotated at the same time.
4 is placed on the stepped portion 22 of the case 18, and with the entire or part of the wall 23 formed above the case 18 bent inward to form a recess 29 with a sloped portion, turn the operating knob 25. It is fixed with a gap 30 between it and the outer periphery. At this time, a bent portion 32 is provided on the outer periphery of the mounting plate 24 to improve the supporting force against the pushing force of the driver. The brush 26 electrically bridges the resistive coating 12 and the contact portion 21, and there is a space 31 to facilitate elasticity in the brush 26.
has been established. Further, the terminal 13°2Q insert-molded in the case 18 is cut to an appropriate length. The upper surface of the operating knob 26 is at the same height as or slightly lower than the top surface 27 formed by bending the wall 23, and the component is mounted on a printed circuit board using an automatic mounting machine using a suction nozzle for mounting wires. This makes adsorption easier. Note that the driver groove 28 of the operation knob 26 is not provided with a wall to prevent the driver from slipping, but is a penetrating groove. Further, although the above variable resistor has been described as an example, other electronic components such as a trimmer capacitor have similar effects and fall within the scope of the present invention.

Effects of the Invention As described above, the present invention includes integrally molding a board formed by connecting terminals into a case having an opening on the top surface, and attaching a mounting plate to the case by installing an operating knob and a brush in this opening. By bending the wall and fixing it to form a recess with an inclined surface, there is no coating on the driver groove, eliminating concerns about quality, and making rotation adjustment easy. The screwdriver is reliably guided to the operating knob by the sloped part formed on the
The driver can be easily set in the driver groove of the operating knob.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a variable resistor according to an embodiment of the present invention, and FIG. 2 is a side sectional view of a conventional variable resistor. 11...Resistance board, 13...Terminal, 1
8...Case, 2o...Terminal, 23.
...Wall, 24...Mounting base, 26...
...Operation knob, 26...Brush, 28...
...driver groove, 29 ... recess. Name of agent: Patent attorney Shigetaka Awano and 1 other person 2nd
Figure ＋＋ -・ b Anti-black board t3-・〜Striped chi 18・・Booth W−・・Beat n・−・Block 2◆・・Base with R 25−・・Sweeping knob・・−Brush

Claims (1)

[Claims] A mounting base with an operating knob and a brush having a screwdriver groove on the top, a board connected to a terminal, and at least a part of this board exposed at the bottom, integrally molded so that the terminal protrudes outside. The brush is placed on the case so that the brush is in sliding contact with the substrate, and the upper part of the wall of the top opening of the case is bent into a concave shape having an inclined surface. An electronic component that is attached to a mounting base.