JPS608603B2 - Manufacturing method of chip resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a chip resistor that can be easily handled by an automatic machine or the like.

As shown in FIG. 1, the conventional method for manufacturing a chip resistor is to make cuts 2 and 3 in the vertical and horizontal directions of a single insulating flat plate 1.
, cut the flat plate 1 along the horizontal cut 2,
Terminal electrodes 4 and 5 are provided on the end faces in the width direction of the divided long flat plate 1 and in the vicinity thereof, and then each electrode on one plane of the flat plate 1 is provided so as to bridge the terminal electrodes 4 and 5. There was a method in which the resistor 6 was provided in a portion divided by the notch 3, and finally, the flat plate 1 was divided along the notch 3 to form a plurality of chip resistors.

However, in the chip resistor obtained by the above method, since the flat plate 1 is first divided along the notches 2, the end surface on which the terminal electrodes 4 and 5 are provided becomes an uneven surface as shown in the second figure, and the terminal The electrodes 4 and 5 could not be provided with a uniform thickness, and the terminal electrodes 4 and 5 were sometimes separated by the convex portion (for example, at part A), which was very inconvenient.

In addition, since this secondary type is ultimately further divided by the notch 3, virtually the entire side surface of the chip resistor becomes an uneven surface. For example, when handling this with an automatic machine such as a parts feeder, However, they also had the disadvantage that they could get stuck with each other, making it impossible to operate them smoothly. Furthermore, in this conventional method, since the cutting is done by bending along the notches 2 and 3, burrs are generated on the cutting surface, and when this is placed on a printed circuit board (not shown), it does not overlap with the board surface. There was also a drawback that a gap was created between the two, making it impossible to install them properly. The present invention has been made in view of the above-mentioned points.Both end faces in the width direction of the longest flat plate are curved, terminal electrodes are provided on both curved end faces, and a terminal electrode is provided on one plane of the long flat plate. , a chip characterized in that a resistor is provided to bridge between the terminal electrodes, and then the elongated flat plate is cut with a slicer in the width direction to separate the resistor into a plurality of pieces. The present invention aims to provide a method for manufacturing a resistor.

The present invention will be described in detail below with reference to embodiments.

In the present invention, first, a long flat plate 11 as shown in FIG. 3 is prepared. This elongated flat plate 11 is configured such that both end faces in the width direction exhibit curved surfaces. This curved surface can be advantageously formed, for example, at the same time as powder molding or by chamfering after molding. Next, this long flat plate 1
1, as shown in FIG. 4, terminal electrodes 12 and 13 are provided on the entire area of both opposing curved end surfaces, respectively. In this case, it is preferable that the terminal electrodes 12 and 13 are provided not only on the curved end surface but also slightly on the flat surface of the substrate 11. Next, as shown in FIG. 5, a plurality of resistors 14 are provided on one plane of the elongated substrate 11 so as to bridge between the opposing terminal electrodes 12 and 13. Each resistor 14
Both ends thereof are electrically conductively connected to both terminal electrodes 12 and 13. Finally, connect the terminal electrodes 12, 13 and the resistor 1 like this.
4 is cut in the width direction between the resistor elements 14 using, for example, a rotary slicer (not shown) to separate each resistor element 14, as shown in the sixth figure. multiple chip resistors. FIG. 7 shows another example of the present invention, in which terminal electrodes 12 and 13 are provided on both curved end surfaces of a long flat plate 11 in a manner that matches the number of resistors 14. .

If you do this, each resistor 1 in the state of the largest flat plate
It becomes possible to measure and trim the resistance value of 4. FIG. 8 shows still another example of the present invention, in which a long flat plate 11
A resistor 14 is provided on the entire surface of one plane.

According to this, the resistance value of the chip resistor can be changed by changing the cutting width with the slicer. Note that the above embodiments and drawings are for embodying the present invention, and are not limited thereto in any way. In short, it is sufficient to use a long flat plate with curved end surfaces and to cut it to obtain each resistor using a slicer, and some design changes are allowed. Furthermore, the slicer is not limited to a rotary type. As described above, in the chip resistor obtained by the method of the present invention, the end surface to which the terminal electrodes are provided is previously formed into a curved surface, so that the state in which the terminal electrodes are provided is extremely stable.

In addition, since the long flat plate is cut by cutting with a slicer, the cut surface can be made smooth, and there is no burr caused by cutting as in conventional methods, and it can be cut with a slicer. The effects are great, such as smooth handling and stable layering on printed circuit boards.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the manufacturing process of a conventional chip resistor;
Figure 2 is a cross-sectional view of a chip resistor obtained by the conventional method.
3 to 6 are perspective views showing the manufacturing process of the chip resistor of the present invention, and FIGS. 7 and 8 show other examples corresponding to the elongated flat plate in FIG. 5. FIG. 11... Long flat plate, 12, 13... Terminal electrode, 14... Resistor. It's a lot of drawings, 2 drawings, 4th drawing, 6 drawings, 7 drawings, 7 drawings.

Claims (1)

[Claims] 1 Both end faces in the width direction of the elongated flat plate are curved surfaces, terminal electrodes are provided on both curved end faces, and a resistor is provided on one plane of the elongated flat plate to bridge between the terminal electrodes. Then, cut the long flat plate in the width direction with a slicer,
A method for manufacturing a chip resistor, characterized in that the resistor is separated into a plurality of pieces.