JPH04129201A - Chip resistor - Google Patents

Abstract

PURPOSE:To obtain a chip resistor which can replace one resistor for two resistors or replace for a chip jumper which can connect three wirings by providing at least one electrode between two electrodes provided at both ends of a ceramic substrate. CONSTITUTION:This resistor comprises a substrate that both ends of a substrate 4 are provided with electrodes 1 and 3 and its center with an electrode 2, a resistor film 6 interposed between them, and this film coated with a passivation film 5. A thick film substrate loaded with this chip substrate can replace one chip resistor for two chip resistors by being provided with electrode patterns which are laminates of chip resistor electrodes 1, 2, and 3. Further, printing conductor films of small resistance value in place of resistor films 6 between electrodes 1, 2 and electrodes 2, 3 provides a chip jumper having three electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chip resistor, and particularly to a chip resistor for surface mounting.

[Conventional technology]

In the conventional chip resistor, as shown in FIG. 2, two electrodes 21 and 22 are provided at both ends of a box-shaped ceramic base material 24 using silver paste material or solder plating. A resistive film 25 is formed in between, and the resistive film 25 is further covered with a protective film 23.
It is an efficient surface-mounted component because it can be mounted on the motherboard with solder on both ends, requiring a minimum surface area, and can be surface-mounted.

In addition, when used for thick film printed circuit boards, two-layer wiring is possible by printing a glass layer between the conductor layers when printing two layers of thick film, but this increases the price of thick film boards. Therefore, by using chip resistors with low resistance, so-called chip jumpers, and mounting them in the necessary patterns, we have been able to connect separated electrodes and eliminate double-layer wiring, reducing costs.

[Problem to be solved by the invention]

This conventional chip resistor or chip jumper has electrodes at both ends, making it a single low-resistance resistor, so it becomes a resistor or jumper that connects the two electrodes at both ends. Only two separate electrodes in the wiring pattern could be connected.

An object of the present invention is to provide a chip resistor that can be used in place of at least two resistors or a chip jumper that can connect three wires.

[Means to solve the problem]

The present invention provides a ceramic base material, two electrodes provided at both ends of the ceramic base material, a resistive film formed on the surface of the ceramic base material between the two electrodes, and a resistive film that covers the resistive film. In the chip resistor having a protective film, the above-mentioned 2
At least one electrode is provided between the two electrodes.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the first embodiment of the present invention, and FIG. 2 is a perspective view of the first embodiment of the present invention.
FIG. 3 is a plan view of an example of a conductive pattern of a substrate on which the chip resistor shown in the figure is mounted.

In the first embodiment, as shown in FIG. 1, an electrode 1 and an electrode 3 are provided at both ends of a ceramic base material 4, and an electrode 2 is provided in the center, a resistive film 6 is formed between them, and a resistive film 6 is further provided. It has a structure in which a protective film 5 is coated on top of the protective film 5.

As shown in FIG. 2, the thick film substrate on which this chip resistor is mounted is provided with electrode patterns 31, 32, 33 that match the electrodes 1, 2.3 of the chip resistor. You can use two resistors instead.

The second embodiment is an example of a chip jumper.

In the second embodiment, between the electrodes 1 and 2 and between the electrodes 2 and 2 shown in FIG.
．． By printing a conductive film with a small resistance value instead of the resistive film 6 between the two electrodes, a chip jumper having three electrodes is obtained.

The thick film printed circuit board on which this is mounted is a chip jumper with 3
It has a wiring pattern that matches one electrode, and can short-circuit three wiring patterns.

As shown in FIG. 2, the electrode pattern 31 of the thick film printed board
, 32 with a width of 150 μm and a pitch of 150 μm between two wiring patterns 34, 35 . When passing one wiring pattern 36 with a width of 150 μm between the electrode patterns 32 and 33,
The size of the chip jumper is 1.6 x 5.5 mm, and the electrode pattern on the thick film board is 0.9' x 1.
It requires a size of 6mm.

By using this chip jumper, you can cover two chip jumpers with one.

〔Effect of the invention〕

As explained above, the present invention provides a chip resistor or a chip jumper with at least three electrodes, so that one chip resistor can replace two resistors, or as a chip jumper, three regions can be connected. This has the effect that cross wiring can be performed beyond the wiring.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the first embodiment of the present invention, and FIG. 2 is a perspective view of the first embodiment of the present invention.
FIG. 3 is a plan view of an example of a conductor pattern of a substrate on which a chip resistor is mounted, and FIG. 3 is a perspective view of an example of a conventional chip resistor. 1.2, 3, 21.22... Electrode, 4, 24... Ceramic substrate, 5, 23... Protective film, 6.25...
Resistive film, 31.32.33...electrode pattern, 34°35.36...wiring pattern.

Claims (1)

[Claims] A ceramic base material, two electrodes provided at both ends of the ceramic base material, a resistive film formed on the surface of the ceramic base material between the two electrodes, and a protective film covering the resistive film. A chip resistor comprising: at least one electrode provided between the two electrodes.