JPS5814502A - Chip resistor with recognition mark - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an easy method for detecting the position of the resistor when performing trimming on a tick resistor mounted on a 21-way block or a 1101-way hybrid block mounted on an electronic device. Concerning tick resistors with recognition marks for carrying out.

FIG. 1 is a perspective view showing the structure of a conventional chip resistor.

In the figure, (1) is a block ceramic insulating base material, (2) is an electrode, (2a) is its external connection electrode, (3
) indicates a resistor, and (4) indicates a coated glass. These are formed by coating the surface of an alumina-based base material (total support) using known thick film forming techniques.

The resistor (3) on the upper main surface is connected to the electrode (2) and the base material (%
, External connection 'dL pole (
2a). Further, a covering glass layer (4) is provided on the top of the resistor (3). The tick resistor shown in FIG. 1 is used in functional block circuits mounted on printed wiring boards mounted on electronic equipment.

Nowadays, in these functional block circuits, functional trimming using a laser device is becoming popular as part of the known semi-fixed volume trimmer.

Also the tip resistor? Not outside of il. In order to automate the trimming, it is necessary to detect the trimming site. The following two methods can be considered as detection methods. The first is by pattern recognition, which has a small recognition area V.
The difference in brightness (
This method optically determines and detects the ratio (white background/black background). The second method is to find a reference in the functional block structure itself and perform position detection using, for example, a guide hole.

The former method requires a root detector that can be optically identified, but with conventional chip resistors, optical detection is difficult because the pattern has few features. In addition, in the latter method, (b) In addition to the dimensions and variations of the substrate itself, positional deviations due to the construction method when installing the chip resistor are added, so it is extremely difficult to accurately detect the position of the chip resistor. There are drawbacks that make it difficult.

The present invention eliminates the drawbacks of the conventional technology, can be mounted on a functional block circuit, can be used for material trimming, and has an optically distinguishable recognition mark on the main surface for easy position detection. The aim is to obtain a chip resistor with marks.

This will be explained based on the original BA't@ aspect.

The chip resistor of the present invention is shown in perspective views in FIGS. 2, 3, and 4.

In the figure, (5) is a ceramic insulating base material, (6) is an electrode, (6a) is its external connection electrode, (7) is a resistor,
(8a), (ab) 14 pairs of recognition marks, (
9) indicates coated glass.

In Figures 3 and 4, electrodes (6) and (6a) are A
1-P4 type or At type conductor paste, resistor (
7), recognition ma l'(8'), (ab) t! Ru
Resistance paste of O2 type or Ay-P (l yarn), coating glass (9) is lead-based amorphous or crystallized type glass paste, alumina-based ceramic insulating base material (5) as entire support. The resistor (7) on the main surface is provided using a known thick film forming technique. The upper part of the resistor (η) is coated with a coating glass (9). The recognition marks (J3a) and (8b) shown in Fig. 2 are connected to the base material (5).
There is no t in one part on the main surface of the resistor (7). Recognition mark at this time (8&), (8b)
The base material (5) is a white fabric, and a black color is used to optically reduce the difference in brightness. This is shown in Figure 4. As shown, there is a hollow recognition mark (8a) surrounding the periphery.
, (ab) can also be constructed, and it is shown that if an optically transparent cut-out glass is used, it may be provided in one part of the resistor. Further, as shown in FIG. 3, a recognition mark may be provided at a part of the electrode VC, which is a part of the upper main surface of the chip resistor that can be optically detected during pattern recognition without impairing the characteristics of the chip resistor. If one or more recognition marks are formed in the same area, no restriction can be given to the sound.

The shape of the recognition mark is a cross-shaped mark i, t for convenience.
- As long as it is only shown and does not interfere with pattern recognition, the size is thermal theory, the shape is triangular, square 2 circles, ring shape, etc., and the assembled one is 1f, I know that it can be used.

The 54th example shows an example of how a chip resistor is mounted on a functional block circuit to explain an example of its use.

(11 is the printing path base material, Ql is the wiring conductor, (2) is the chip resistor and target, and 04 is the other component parts.

The chip resistor (b) is mounted with the main surface with the identification mark facing upward, placed on the wiring conductor 9 along with other components, and mounted by soldering or conductive contact. After that, the chip resistor (2) of the circuit-E is subjected to functional trimming using a laser device or the like by detecting the position of the chip resistor using the recognition mark provided on the upper main surface and setting it as the trimming part. It's something that doesn't work.

In the structure of the chip resistor according to the present invention, since an optically detectable recognition mark is provided on the main surface of the chip resistor, automatic pattern recognition, which was difficult in the conventional chip resistor structure, is extremely easy. Since the recognition mark of the present invention is made of a resistor paste, it can be formed at the same time as the resistor to be trimmed, so the relative positional relationship between the recognition mark and the resistor does not change. This produces effects that can be used industrially, such as being able to more accurately set the position.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional chip resistor. The treetops, FIGS. 5 and 4, relate to the present invention. Chip resistor t A perspective view of a chip resistor partially cut away; FIG. 5 is a plan view of a functional block U equipped with the chip resistor of the present invention;
shows. 5: Ceramic insulating base material 6:1 [Pole 6a; External connection electrode 7: Resistor 8as8b: Recognition mark
? =Coated glass Figure 1 Figure 2

Claims (1)

[Claims] An electrode, a resistor, an external connection/lJL pole in which the conductive layer is connected to the side surface (and a part of the back surface) of the base material, and the above-mentioned A chip resistor having a coating glass layer provided on the resistor, wherein at least one recognition mark for pattern detection is provided on any part of the upper principal surface of the chip resistor, the recognition mark being unevenly distributed over all stages. .