JPH02166701A - Printed resistor - Google Patents

Abstract

PURPOSE:To improve mounting density and to shorten trimming time by trimming the superposition part between the first and second resistors excluding a contact part such that it crosses the longitudinal direction of the contact part. CONSTITUTION:For trimming of a printed resistor, first the first and second resistors and an insulating layer are trimmed from the position P up to the position Q along the longitudinal direction (X direction) of a contact part 4 so as to form a trimming groove 8. And the first and second resistors and the insulating layer are trimmed from the position Q up to the position R in the direction (Y direction) crossing the X direction at right angles so as to form a trimming groove 9, whereby the trimming is completed. This way, a resistor R1 between a third electrode 5c and a fourth electrode 5d, a resistor R2 between a first electrode 5a and a second electrode 5b, and a resistor R3 between a second electrode 5b and the fourth electrode 5d, are decided respectively. And since it is made in a laminated structure that the first and second resistors 1 and 3 which contacted electrically at a contact part 4 have the insulating layer 2 in between, by trimming the superposition part of both resistors at a time in this condition, though the function trimming essentially needed separate trimmings, th equivalent effect can be obtained with trimming of one time.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to improvements in printed resistors printed on hybrid integrated circuit boards.

(Prior Art) As is well known, a hybrid integrated circuit is known in which desired circuit characteristics are obtained by trimming a printed resistor for function trimming in the circuit using a laser beam or sandblasting while the electronic circuit is operating. Conventionally, the method for trimming printed resistors in such hybrid integrated circuits involves trimming one resistor at a time, repeating trimming and characteristic measurements for a plurality of resistors, and changing the irradiation position of the trimming medium each time.

However, the conventional technique has the disadvantage that the speed of the trimming process is slow because the resistors are trimmed one by one. Furthermore, since the irradiation position of the trimming medium is changed each time a plurality of resistors are trimmed, the function software also becomes complicated.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and aims to improve the packaging density and shorten the trimming time.
Moreover, it is an object of the present invention to provide a printed resistor that can also simplify the software.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides first and second resistors that have a contact portion that directly contacts along one direction and are overlapped with each other with an insulating layer interposed therebetween; and four electrodes provided at the ends of the first and second resistors opposite to the contact part and spaced apart from each other along the longitudinal direction of the contact part, excluding the contact part. The printed resistor is characterized in that the overlapping portion of the first and second resistors is trimmed so as to intersect at least the longitudinal direction of the contact portion.

In the present invention, the first resistor and the second resistor are brought into direct contact along one direction to form an electrically integrated resistor, creating a shape that looks as if a plurality of resistors were electrically connected. It is what you do.

In the present invention, the overlapping portion of the first and second resistors excluding the contact portion is trimmed so as to intersect with the longitudinal direction of the contact portion. It is generally easy to adjust the resistance value by trimming the two resistors including the insulating layer along the contact portion, and then trimming the resistor so as to cross the contact portion.

In addition, the resistance value can also be adjusted by directly trimming so as to intersect the contact portion.

(Function) According to the present invention, the packaging density can be improved, the trimming time can be shortened, and the software can be simplified.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3. However, Fig. ff11 is a schematic perspective view of a printed resistor according to the present invention, Fig. 2 is a conceptual explanatory diagram of the printed resistor shown in Fig. 1, and Fig. 3 is a diagram showing a printed resistor for function trimming on a hybrid integrated circuit board. FIG.

1 in the figure is a first resistor formed by printing on an insulating substrate (not shown). A second resistor 3 formed by printing is laminated on the first resistor 1 with an insulating layer 2 in between. However, the first resistor 1 and the second resistor 3 are
They are in direct contact at one end surface to form a contact portion 4. At the end of the first resistor 1 opposite to the contact portion 4, a first electrode 5a and a second electrode 5b are spaced apart from each other.
is provided. Similarly, in the second resistor 3,
A third electrode 5c and a fourth electrode 5d are provided spaced apart from each other along the longitudinal direction of the contact portion 4. Of the electrodes mentioned above, the electrode 5a is a GND side electrode conductor, the electrode 5b is an electrode conductor connected to the first OP amplifier 6, the electrode 5c is a high potential electrode conductor, and the electrode 5d is connected to the second OP amplifier 7. It is an electrode conductor.

To trim the printed resistor having such a configuration, first, start from position P along the longitudinal direction (X direction) of the contact portion 4.
- After trimming the second resistor and insulating layer to position Q to form trimming groove 8, move the first m2 resistor and insulating layer from position Q to position R in a direction (Y direction) perpendicular to the X direction. The trimming is completed by trimming to the point where the trimming groove 9 is formed. Through this series of operations, the resistance R1 between the third electrode 5c and the fourth electrode 5d, the first
A resistance R2 is determined between the electrode 5a and the second electrode 5b, and a resistance R3 is determined between the second electrode 5b and the fourth electrode 5d.

According to the above embodiment, since the first and second resistors 1 and 3 that are in electrical contact with each other at the contact portion 4 have a laminated structure with the insulating layer 2 interposed therebetween, in this state, both paper By trimming the overlapping parts at once, function trimming, which originally required separate trimming, can achieve the same effect with a single trimming, and can also be used for high-density hybrid integrated circuit boards and high-speed function trimming. can be realized. Here, the relationship between the trimming amount and the resistance value is determined by R1. , R2°R3, as shown in Figure 4, the resistance value of R3 increases rapidly in the first trimming direction (X direction), and in the second trimming with point Q as the border, R1 and R2 increase more rapidly. rise to From these facts, the reference voltage of the window comparator can be adjusted by -degree trimming.

In addition, in the above embodiment, a case was described in which the first and second resistors and the insulating layer were trimmed in two stages: in the X direction along the contact portion and in the Y direction perpendicular to this, but the present invention is not limited to this. . For example, as in the example,
After performing the directional trimming, further trimming may be performed as shown by dotted arrows Z in FIG. By taking this measure, fine adjustment of the resistance value becomes possible. Further, as shown in FIG. 5, trimming in the Y direction may be performed from the beginning.

[Effects of the Invention] As detailed above, according to the present invention, the mounting density of printed resistors for function trimming formed on a hybrid integrated circuit board is increased, and function trimming of a plurality of resistors is realized by continuous operation. To provide a printed resistor that can perform trimming at high speed without complicating function trimming software.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a printed paper antibody according to an embodiment of the present invention, Fig. 2 is a conceptual explanatory diagram of the printed resistor shown in Fig. 1, and Fig. 3 is a relationship between the resistances of various parts of this printed resistor. FIG. 4 is a characteristic diagram showing the relationship between trimming amount and resistance value, and FIG. 5 is an explanatory diagram showing a trimming method different from the above embodiment. 1.3... Resistor, 2... Insulating layer, 4... Contact part, 5a, '5b, 5c, 5d-electrode, 6.7... Operational amplifier, 8, 9... Trimming groove . Applicant's agent Patent attorney Takehiko Suzue Figure 2 Trimming ゛1 total □ Figure 4

Claims (1)

[Claims] First and second resistors have contact portions that directly contact each other along one direction and are overlapped with each other with an insulating layer interposed therebetween; and end portions of the first and second resistor elements on the opposite side of the contact portion Moreover, the four electrodes are provided spaced apart from each other along the longitudinal direction of the contact portion, and the overlapping portion of the first and second resistors excluding the contact portion at least intersects the longitudinal direction of the contact portion. A printed resistor characterized by being trimmed so as to.