KR0181774B1 - Chip type rc filter having resistor and condenser - Google Patents

Abstract

The present invention relates to a chip-type RC filter in which a resistor element and a condenser terminal are configured on both sides of a substrate in a three-terminal or four-terminal shape. The chip-type RC filter according to the present invention does not require a separate terminal forming process. It is intended to provide a chip-type RC filter that can be easily picked up or handled and can be used separately from a capacitor and a resistor.

Needle type RC filter of the present invention has a semi-circular groove in the center of at least one side of the alumina substrate, the electrode pair is formed on the upper and lower surfaces of the substrate on the basis of the side, respectively, and the electrode pair of the upper surface It is characterized in that it has a three-terminal or four-terminal side electrode structure in which a resistor element is formed to be connected to and connected to the electrode pair of the lower surface.

Description

Chip type RC filter with resistor and capacitor terminals on both sides

1 is a plan view of a general chip type RC filter.

2 (a) is a plan view of a chip type RC filter having three terminals according to the present invention.

2 (b) is a plan view of a chip-type RC filter having four terminals according to the present invention, in which terminals are formed in different directions.

2 (c) is a plan view of a chip-type RC filter having four terminals according to the present invention, in which terminals are formed in the same direction.

3 (a) and 3 (b) are internal plan views of the chip-type RC filter having three terminals corresponding to the second (a) diagram in which the capacitor component and the resistor component are printed, respectively.

3 (c) and 3 (d) are internal plan views of the chip-type RC filter having four terminals corresponding to the second (c) diagram in which the capacitor component and the resistor component are printed, respectively.

4 is a plan view of an alumina substrate used to manufacture a double-sided chip type RC filter having four terminals according to the present invention.

5 is a plan view showing a cross-sectional electrode forming process of a chip-type RC filter having four terminals according to the present invention.

The present invention relates to a chip-type RC filter composed of resistors and capacitor terminals on both sides. More particularly, the present invention relates to a chip type RC filter in which a resistor element and a condenser terminal are formed on both sides of a substrate in a three terminal type or a four terminal type. The chip type RC filter according to the present invention does not require a separate terminal forming process. Vacuum pick-up or handling of the device is easy, and the capacitor and resistor can be used separately.

Typically, an RC filter requires four electrode terminals to allow two functional elements (passive components) to coexist. That is, two terminals for resistance and two terminals for capacitor. In practical use, one terminal can be shared, so having three terminals is not a great inconvenience for most cases. A typical external shape of a conventional chip type RC filter is shown in FIG.

In the conventional chip type RC filter, as shown in FIG. 1, two functional elements, that is, resistance electrode terminals 1 and 2 and capacitor electrode terminal 3, are formed on one surface of an alumina substrate. Is not functioning at all. In particular, the capacitor electrode terminal 3 is mostly formed at the waist of the chip component. In many cases, capacitors are used with one terminal grounded, which is used primarily for grounding. However, this type of RC filter adds a new process that requires a separate ground terminal for the waist. On the other hand, the width of chip components is generally only about half the length. Therefore, there is a disadvantage that the width of the element actually formed in the component is further restricted because of this terminal located in the width portion.

On the other hand, since the electrode is formed on the waist of the chip, the height of the protective layer at the center of the chip is likely to be different from that of the electrode, and the surface has a relatively non-uniform thickness distribution due to this difference. Therefore, pick-up errors due to thickness unevenness are likely to occur when picking up chips with a force of vacuum in the chip mounter. For this reason, the conventional RC filter is mainly used to manufacture a relatively large chip size or an array type.

Accordingly, the present invention, in order to solve such a conventional problem, one electrode terminal (three-terminal type) or two electrode terminals (four-terminal type) is formed on one side, two electrode terminals on the other side It is an object of the present invention to provide a chip-type RC filter which is formed and has a resistance element and a capacitor element formed on each side thereof.

In addition, an object of the present invention is to provide a chip-type RC filter, which does not require a separate terminal forming process, facilitates vacuum pickup or handling of an element, and which has electrode terminals printed on both sides of a capacitor and a resistor separately. .

Hereinafter, the present invention will be described in more detail.

In the chip-type RC filter of the present invention, a semicircular groove is formed at the center of at least one side surface of the alumina substrate, and electrode pairs are formed on the upper and lower surfaces of the substrate with respect to the side surface, respectively, and electrode pairs are formed on the upper surface. It is characterized in that it has a three-terminal or four-terminal side electrode structure in which a resistor element is formed to be connected to and connected to the electrode pair of the lower surface.

In the chip-shaped RC filter according to the present invention, the electrode pairs are formed in the same direction or in different directions on the upper and lower surfaces thereof, and at least one electrode pair is electrically separated from each other.

In addition, the resistor element or the capacitor element of the chip-type RC filter according to the present invention can be formed in a single layer or multiple layers.

When described in more detail based on the accompanying drawings of the present invention as follows.

2 (a) is a plan view of a chip type RC filter having three terminals according to the present invention, and FIG. 2 (b) is a view of a chip type RC filter having four terminals according to the present invention in which terminals are formed in different directions. Fig. 2 (c) is a plan view of a chip-type RC filter having four terminals according to the present invention, in which terminals are formed in the same direction.

The present invention improves the shape of the substrate to be used and the shape of the electrode of the chip into a three-terminal shape as shown in FIG. 2 (a) or a two-terminal shape as shown in the second (b) and second (c) drawings. Electrode terminals (generally, terminals for grounding capacitors) formed on the side of the component are formed on both electrodes of the chip component at a time.

That is, one of the two electrode terminals formed on one side is configured to be connected to the upper surface of the substrate and the other to the lower surface of the substrate. Therefore, as a whole, one electrode pair exists on the upper surface of the substrate, and the other electrode pair exists on the lower surface of the substrate. However, the two electrode pairs are completely electrically separated from each other, for example in the case of the four-terminal type, as shown in FIG. 2 (b) and FIG. 2 (c).

In the RC filter according to the present invention, as shown in FIG. 3 (a) and FIG. 3 (c), a capacitor is formed between one of the two electrode terminal pairs, and a third (b) and a third (d) are formed on the other surface. A resistor is formed like a tile. 3 (a) and 3 (b) are internal plan views of the chip type RC filter having three terminals corresponding to the second (a) diagrams in which the capacitor component and the resistor component are printed, respectively. FIG. 3 (d) is an internal plan view of the chip type RC filter having four terminals corresponding to FIG. 2 (c) in which the capacitor component and the resistor component are printed.

According to the present invention, in the case of the capacitor, thick film printing of the electrode / thick film printing of the dielectric / thick film printing of the electrode are repeated, and individual or simultaneous firing to form a monolayer structure, or the printing process is repeated several times, individually or simultaneously By firing, a capacitor having a multilayer structure can be formed.

In the case of a resistor, the electrodes / resistors may be formed by thick film printing, individually or co-fired, and then formed according to subsequent manufacturing processes in the same manner as in the conventional method.

The double-sided chip type RC filter manufactured by the present invention has the following advantages over the conventional RC filter.

(1) After the formation of the protective layer and marking, the alumina substrate used to manufacture the 4-terminal chip-type RC filter is firstly divided, and the cross-sectional electrode formation process of the 4-terminal chip-type RC filter is shown as shown in FIG. If the electrode is formed on the side in the same manner as 5 degrees, all cross-sectional electrodes are formed at once.

(2) Since the terminal is not formed in the width portion, the width of the element formed in the component can be actually formed wider, and therefore the formation of the resistor or the capacitor is much easier.

(3) Since the electrode is not formed at the waist of the part, the thickness of the center portion of the chip is relatively uniform. Therefore, it is good to pick-up chips with the force of vacuum in the chip mounter.

(4) The four-terminal type can be used not only as an RC filter but also as a single part of each capacitor and resistor, or as a RC composite part, since the terminals of the capacitor and the resistor are completely separated from each other.

However, in using the product of the present invention, particularly when the four-terminal form is used as a composite element of the capacitor and the resistor, the terminal for the resistor and the terminal for the resistor must be clearly separated from each other. Such identification may form a separate marking on the protective layer of the chip (eg, different marking markings), or may form a notch of some form in one of the shapes of the entire chip.

The present invention will be described in more detail based on the following examples.

Example 1

Repeated printing / drying of electrodes, dielectrics, and electrodes on one side of the alumina substrate with holes formed on one side of the chip space in the substrate so as to form three terminals, and multilayered the substrate As shown in FIG. 3 (b), the electrode and the resistor are thick-printed on the back side, and then formed using a simultaneous firing step. Thereafter, a first protective layer is formed on the resistive layer in the same manner as the conventional method, and is adjusted to a desired resistance value by laser etching. Thereafter, the second protective layer is marked with a thick film printing method and a firing step. The substrate is first divided into a bar shape, and electrodes are formed on both sides at the same time by dip coating or the like as shown in FIG. 5. Subsequently, dividing into individual unit elements is separated into the size and shape of the finished product. Each of the divided elements is plated with Ni and Sn or Sn / Pb by using the conventional chip resistor manufacturing technology, and after the inspection process, the finished product of the three-terminal chip type RC filter as shown in FIG. Is manufactured.

Example 2

On one side of the alumina substrate having the shape as shown in FIG. 4, the electrode, the dielectric, and the electrode are repeatedly printed / dried as shown in FIG. 3 (c), and the substrate is inverted again. After thick film printing, it is formed using a co-firing process. Then, when the chip-shaped RC filter is formed in the same manufacturing process as in Example 1, a four-terminal component as shown in FIG. 2 (c) is formed.

The four-terminal chip type RC filter has the following advantages over the three-terminal type.

First of all, the terminals of capacitor and resistor are completely separated so that they can be used separately. That is, it is used not only as an RC filter but also as a single part or complex part of a capacitor and a resistor. Second, since the terminals are completely separated from each other, the circuit can be arbitrarily configured by connecting the terminals in a desired form.

Claims (4)

Semicircular grooves are formed at the center of at least one side surface of the alumina substrate, and electrode pairs are formed on the upper and lower surfaces of the substrate with respect to the side surface, respectively, and resistor elements are formed to be connected to the upper electrode pairs. And a three-terminal or four-terminal side electrode structure in which a condenser element is formed so as to be connected to an electrode pair on a lower surface thereof. The chip type RC filter according to claim 1, wherein the electrode pairs are formed in the same direction or in different directions on the upper and lower surfaces. 3. The chip-type RC filter according to claim 1 or 2, wherein at least one of the electrode pairs is electrically separated from each other. The chip type RC filter according to claim 1, wherein the resistor element or the capacitor element is formed in a single layer or a multilayer.