JPH0115121Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in chip resistors.

FIG. 1 is a side sectional view showing the structure of a conventional chip resistor. In the figure, 1 is a rectangular support base made of, for example, alumina, and 2 is a resistor made of, for example, tantalum, which is adhered to the upper surface of the support base 1.
21, 21 are upper electrodes formed at both ends of the resistor 2.

FIG. 2 is a side sectional view showing a state in which a conventional chip resistor is mounted, for example, on a printed circuit board in a so-called face-down manner. In the conventional chip resistor, the upper electrodes 21 and 21 and the electrode (land) of the printed circuit board 5 are connected with the resistor 2 facing the printed circuit board 5 side.
51 and 52 are fixed by reflow soldering.

When the conventional chip resistor is mounted on a printed circuit board as described above, since the supporting base 1 is located on the upper side, the upper electrodes 21, 21 and the electrode 5 are connected to each other.
There was a drawback in that it was difficult to visually determine whether or not 1 and 52 were reliably soldered.

Furthermore, even if one of the resistors installed on the printed circuit board is defective and needs to be replaced, it is extremely difficult to replace or repair the resistor because it is soldered face-down. There was a drawback.

On the other hand, in order to eliminate the above-mentioned drawbacks in thick film chip resistors, a method has been adopted in which horizontal electrodes are formed as a thick film on the side surfaces of the end portions of the support base. However, in thin film chip resistors, if the horizontal electrodes were to be formed, the thin film resistor would oxidize and disappear during firing, so it was impossible to provide the horizontal electrodes.

The present invention was developed in view of the above circumstances, and it is an object of the present invention to provide a chip resistor in which a horizontal electrode is formed on the end side surface of a support base.

For this purpose, in the chip resistor according to the present invention, an upper electrode is formed at the end of the resistor provided on the surface of the support base, and a clip with a notch formed in the upper electrode is inserted into the upper electrode. so that it comes into contact with
It is characterized in that a horizontal electrode is formed at the end of the support base by attaching it to the end of the support base.

An embodiment of the chip resistor according to the present invention will be described below with reference to the drawings.

FIG. 3 is an enlarged perspective view showing the external appearance of a thin film chip resistor in which the present invention is applied. In the figure, reference numeral 1' denotes a rectangular parallelepiped supporting base made of, for example, alumina, and a thin film resistor 2' made of, for example, tantalum is adhered to the upper surface of the supporting base 1' by an appropriate method. and thin film resistor 2'
A multilayer film-like upper electrode 21', 2 is formed on the surface of both ends of the
1' is formed. Further, clips 3 made of, for example, brass, which have been subjected to an appropriate surface treatment, are inserted into both ends of the support base 1', and an upper electrode 31, which will be described later, of the clip 3 is connected to the upper electrode 21' by soldering. By doing so, horizontal electrodes 33 are formed on the side surfaces of the end portions of the support substrate 1'.

FIG. 4 is an enlarged perspective view showing the appearance of the clip. The clip 3 includes an upper electrode 31 and a lower electrode 32 on the upper and lower sides of the horizontal electrode 33.
1 and the lower electrode 32 so that the support substrate 1' can be held between the support substrate 1' and the lower electrode 32. In the clip 3, notches 31a and 32a are formed at the center of the upper electrode 31 and the lower electrode 32.

The chip resistor according to the present invention constructed as described above is used as follows. That is, FIG. 5 is a side sectional view showing a state in which the chip resistor according to the present invention is attached to a printed circuit board 5'. As shown in FIG. 5, in the chip resistor according to the present invention, for example, the lower electrodes 32, 32 of the clips 3, 3 are connected to the electrodes 5' of the printed circuit board 5' with the resistor 2' facing upward.
1' and 52', for example, by reflow soldering. 41 and 42 are solders for connecting the lower electrodes 32 and 32 to the electrodes 51' and 52'.

In the chip resistor according to the present invention, when the lower electrodes 32, 32 are reliably soldered to the electrodes 51', 52', a part of the solder 41, 42 is soldered to the lower electrodes, as shown in FIG. 32, 32 and the outside of the horizontal electrode 33. Since the protruding portions of the solder 41, 42 as described above can be sufficiently recognized by visual inspection, it can be recognized that the lower electrodes 32, 32 and the electrodes 51', 52' are reliably connected by soldering. .

As is clear from the description of the embodiments above, the chip resistor according to the present invention can be mounted on a printed circuit board, etc. by reflow soldering, for example, with the resistor facing upward or downward, and the required electrodes can be reliably connected to each other. It is possible to easily visually determine whether or not the connection is made by soldering.

Further, since the chip resistor according to the present invention is provided with horizontal electrodes, the chip resistor can be easily attached and detached using a soldering iron, so that the resistor can be replaced or repaired in a short time.

Furthermore, since the chip resistor according to the present invention has a notch formed in the upper electrode of the clip that contacts the upper electrode, the end face distance of the upper electrode becomes longer, and as a result, the solder between the upper electrode and the upper electrode increases. In addition to improving the bonding strength, this also has the effect of strengthening the solder connection between the chip resistor and, for example, a printed circuit board, even when the chip resistor is mounted face-down.

Further, since the chip resistor according to the present invention has the cutout, visual inspection of the soldering becomes easy when the upper electrode and the upper electrode of the clip are soldered in advance.

Note that in the above embodiment, the upper electrode 3 of the clip 3
1 and the lower electrode 32 have notches 31a and 3 in the center.
However, the present invention is not limited to this, and a notch 31a' similar to the notch 31a may be formed only in the upper electrode 31 as shown in FIG. Alternatively, a notch 31a'' that is deeply cut into the upper part of the horizontal electrode 33 may be formed in the center of the upper electrode 31.

Further, the lower electrode 32 may be formed into a single piece with a narrow width as shown in FIG. 6C.

Further, in the embodiment shown in FIG. 3, it has been explained that the upper electrode 21' and the upper electrode 31 are connected by soldering, but the present invention is not limited to this. For example, when a sufficient amount of solder or solder paste is applied to the electrodes of a printed circuit board in advance and the face-down method is used, or when the printed circuit board is immersed in soldering. ), the upper electrode 21' and the upper electrode 31 do not have to be connected by soldering in advance, but the printed circuit board electrode and the upper electrode 31 or the lower At the same time that the electrode 32 is soldered, the upper electrode 31 and the upper electrode 21' are also soldered due to wetting of the solder. Also in this case, the present invention provides the same effects as described above.

Furthermore, if the clip is made of a magnetic material such as iron, the chip resistor can be handled with a magnet, which is very convenient for automating mounting.

Although the embodiments have been explained using a thin film resistor as an example, the present invention can of course be applied to a thick film resistor.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing the configuration of a conventional chip resistor, Fig. 2 is a side sectional view showing a conventional chip resistor mounted face-down on a printed circuit board, and Fig. 3 is a side sectional view showing the structure of a conventional chip resistor. An enlarged perspective view showing the appearance of an example of a thin film chip resistor,
Figure 4 is an enlarged perspective view showing the appearance of the clip, Figure 5 is an enlarged perspective view showing the appearance of the clip.
The figure is a sectional side view showing the state in which the chip resistor according to the present invention is attached to a printed circuit board, and FIG. 6 shows another embodiment of the clip. 1, 1'...Support base, 2...Resistor, 2'...
Thin film resistor, 21, 21, 21', 21'... upper electrode, 3... clip, 31... upper electrode, 32...
...lower electrode, 33...horizontal electrode, 31a, 31a', 3
1a'', 32a...notch, 41, 42...solder,
5, 5'...Printed circuit board, 51, 52, 51',
52'...electrode.

Claims (1)

[Scope of utility model registration request] By forming an upper electrode at the end of the resistor provided on the surface of the support base, and attaching a clip with a notch formed in the upper electrode to the end of the support base so that the upper electrode comes into contact with the upper electrode. , a chip resistor characterized in that a horizontal electrode is formed on the side surface of an end of a support base.