JP2510326Y2 - Surface mount variable resistor - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor mounted on a circuit board of an electronic device and capable of adjusting a resistance value.

[0002]

2. Description of the Related Art Conventionally, a variable resistor is generally formed with a driver slot for adjusting resistance. This driver slot is for interlocking a slider of a resistor. Was folded back to form a driver slot, or a driver slot was provided in an adjustment knob of a resin molding member having a rotating shaft to be inserted into a slider. In recent years, in particular, due to the demand for miniaturization of electronic devices, surface mount type variable resistors have come out, and in this surface mount type variable resistor, the shape is small and the rotary shaft is made of a resin molded member. The adjusting knob could not be formed, and the driver slot piece integral with the slider was folded back to provide the driver slot.

[0003]

In the case of the above conventional technique, the adjustment knob of the resin molding member is, as described above, covered by the slider and has a large shape. It could not be used for the following variable resistors. Further, in the case of the surface mount type variable resistor, the driver slot formed on the metal piece integral with the slider is formed in a negative shape because the shape is small. However, the driver slot formed in the metal plate in the shape of − is small in shape and cannot be adjusted unless the insertion position of the driver is aligned with the direction of −, so it cannot be placed on the automated line and must be adjusted manually. It had the drawback of having to.

The present invention has been made in view of the above-mentioned conventional technique, and an object thereof is to provide an ultra-compact surface mount type variable resistor whose resistance value can be surely adjusted by an automatic adjusting device.

[0005]

According to the present invention, a resin-molded driver slot member is provided so that it can be placed on a slider, and a plurality of engaged portions are formed in the driver slot member. Surface mounting type in which an engaging piece that engages with a portion is integrally provided on the slider, the driver slot member is placed on the slider, and the engaging piece engages with the engaged portion. It is a variable resistor.

[0006]

In the surface mount type variable resistor of the present invention, a large driver slot can be provided by the resin molded driver slot member that can be mounted on the slider, and the resistance value can be easily adjusted automatically. Therefore, the driver slot member can be easily attached only by engaging the engaging piece with the engaged portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 3. In the surface mount type variable resistor of this embodiment, a resistor (not shown) is formed on the surface of the chip substrate 10, and the slider 12 is slidable on the resistor.
Is attached. The slider 12 is pivotally supported by a rotary shaft 16 inserted in a through hole 14 formed in the central portion of the chip substrate 10, and the tip of the rotary shaft 16 is eyelet-shaped so that the slider 12 is formed. It does not come off. Rotating shaft 16
Is extended from the middle terminal electrode 18 attached to the central portion of the back surface of the chip substrate 10, and is formed by squeezing a part of the middle terminal electrode 18.

T-shaped projecting engaging pieces 20 are formed on the upper surface of the slider 12 at three locations. The engaging pieces 20 are attached to the engaged portion 24 of the resin driver slot member 22. Engaged. The driver slot member 22 has a + -shaped driver slot 26 formed in the center thereof, is shaped to be mountable on the upper surface of the slider 12, and is provided at a position facing the engaging piece 20. Notch 24a and recess 2
4b is provided with the engaged portion 24. Also,
Slopes 28 are formed between the slots of the driver slots 26 so that a driver for adjustment can be easily fitted into the + -shaped driver slots 26. Further, a flat portion 32 parallel to the surface of the chip substrate 10 is formed around the driver slot 26 and the inclined surface 28 so that the flat portion 32 can be adsorbed by the automatic mounting device. Further, a pair of terminal electrodes 30 connected to both ends of the resistor are fitted into one end surface of the chip substrate 10.

In the method of manufacturing the surface mount type variable resistor of this embodiment, first, the rotary shaft 1 of the middle terminal 18 is mounted on the chip substrate 10.
6 is inserted, the slider 12 is inserted into the rotary shaft 16 and eyelets are attached, and the driver slot member 22 is placed on the upper surface of the slider 12. Then, the engagement piece 20 formed on the slider 12
Is bent and engaged with the engaged portion 24 of the driver slot member 22. In this engagement, the T-shaped engaging portion 20 is fitted into the cutout portion 24a and the recessed portion 24b to be engaged. When the surface mount type variable resistor is surface mounted on the surface of the circuit board of various electronic devices, the flat part 32 is adsorbed by the automatic mounting device and is carried to a predetermined position so that the electrodes 18 and 30 are mounted. Soldered. After that, an adjusting driver is inserted into the driver slot 26 by an automatic resistance adjusting device or the like, and the resistance value is automatically adjusted.

According to the surface mount type variable resistor of this embodiment, the driver slot member 22 made of resin is placed on the upper surface of the slider 12, and the + -shaped driver slot 26 and the inclined surface 28 are used for the automatic adjusting device. This makes it possible to easily and surely perform automatic adjustment. Further, the flat surface portion 32 of the driver slot member 22 can be attached to the circuit board by being adsorbed by the automatic mounting device at the time of surface mounting, and the mounting operation can be easily automated.

Next, a second embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. Here, the same members as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted. In this embodiment, the engaging piece 40 is bent and fixed to the engaged portion 44 of the driver slot member 22 in a U-shape. And also in the driver slot member 22 of this embodiment,
An inclined surface 28 is provided between the driver slots 26, and a circular flat surface portion 32 that is attracted during automatic mounting is formed around the inclined surface 28.

According to the surface mount type variable resistor of this embodiment, since the engaging piece 40 is bent and caulked and fixed to the engaged portion 44 of the driver slot member 22, the driver slot member 22 is loose. There is no adjustment and there is no adjustment.

The surface mount type variable resistor of the present invention is not limited to the above-mentioned embodiment, but the shape of the resin driver slot can be set appropriately, and a minus type driver slot may be used. The engaging piece and the engaged portion may be simply folded and engaged, or the tip of the engaging piece may be further bent and sandwiched by the driver slot member to ultrasonically weld the engaging piece.

[0014]

The surface mount type variable resistor of the present invention has a driver slot member made of resin which is engaged with the upper surface of the slider to provide a driver slot of an automatically adjustable size with a very small surface. It is designed so that it can also be provided in a mounted variable resistor. This makes it possible to supply this surface mount type variable resistor to the automation line by the automatic assembly and adjustment machine,
We can expect a significant increase in production efficiency. Moreover, the external shape does not become large, the driver slot member can be attached simply by engaging the engaging piece with the engaging portion, and the assembly of the variable resistor itself can be performed very easily.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing a driver slot member of a surface mount type variable resistor according to a first embodiment of the present invention.

FIG. 2 is a front view of the surface mount type variable resistor of this embodiment.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a front view of a surface mount type variable resistor according to a second embodiment of the present invention.

FIG. 5 is a partial perspective view of the surface mount type variable resistor of this embodiment.

[Explanation of symbols]

 10 chip substrate 12 slider 20 engaging piece 22 driver slot member 24 engaged portion 26 driver slot

Claims (2)

(57) [Scope of utility model registration request] 1. A surface mount type variable resistor in which an electrode portion on the back surface of a chip substrate is directly soldered to a circuit board, and a slider slides on a resistor formed on the surface of the chip substrate to change the resistance value. At the center of the back surface of the chip substrate
The above-mentioned chip is integrally extended from the fixed middle terminal electrode.
It has a rotating shaft that is inserted through a through hole formed in the center of the board.
However, the tip of this rotating shaft is eyelet on the surface of the chip substrate.
Installed so that the above slider does not come off.
-Slot formed and resin molded screwdriver slot
The slide member is placed on the slider and the driver slot
A plurality of engaged portions are formed on the cover member and
A plurality of engaging pieces that physically engage with the engaged portion are formed.
And each of the engaging pieces is engaged with each of the engaged parts.
Each of the above-mentioned engaging pieces moves the above-mentioned engaged parts in the vertical direction and the rotating direction.
A surface mount type variable resistor characterized in that it is engaged and held in the opposite direction . 2. A + -shaped driver slot is formed in the central portion of the driver slot member, and a slope is formed between the driver slots toward the bottom of the driver slot. Around the driver slot and the slope. A flat portion is formed to form the flat portion.
The surface mount variable resistor described.