JPH0328549Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Industrial application field> This invention relates to integrated circuit boards.

<Conventional technology> In electronic circuits, etc., a resistor is placed on the surface of an insulating substrate. Capacitor. 2. Description of the Related Art Integrated circuit boards configured by loading semiconductor devices and the like are generally used. For example, when constructing a circuit consisting of resistors R ₁ to _{R 8} as shown in Figure 1, especially when constructing each resistor with a thick film, paste for resistors is applied to the surface of a substrate such as ceramic. The paste for the necessary conductors is printed and fired. _T1 to _T5 are terminals.

<Problems with the prior art> In order to manufacture such an integrated circuit board, measurements are usually taken to determine whether the circuit network has predetermined characteristic values after firing. Measuring the resistance values of resistors ₁ to _R3 , _R8, etc. does not pose much of a problem, but when resistors _R4 to _R7 form a closed circuit, the resistance to be measured and other resistors may be If the ratio of the resistance values is large, accurate measurement will not be possible. Measuring such resistance values is not only necessary to determine whether the network of resistors exhibits the desired characteristics;
It is also necessary when trimming to exhibit a predetermined resistance value. Conventionally, therefore, the resistance to be measured has been measured by separating it from other resistances, such as by cutting a conductor, and then reconnecting them using solder or other means. However, this method has the disadvantage that the work required for measurement is complicated and troublesome.

The purpose of this invention is to provide an integrated circuit board that makes it extremely easy to measure circuit elements constituting a closed circuit.

This invention also aims to reduce the packaging density of circuit elements.

<Means for solving the problem> In order to achieve the above object, this invention mounts a plurality of circuit elements on the surface of an insulating substrate, connects them, and creates a circuit including at least one closed circuit. In the integrated circuit board forming a network, at least one circuit element among the circuit elements forming the closed circuit is placed on a surface opposite to one surface of the substrate on which other circuit elements are mounted. The closure is achieved by connecting a terminal connected to a circuit element mounted independently on the opposite surface and a terminal connected to another circuit element mounted on the one surface with a clip terminal. This is a circuit constructed.

<Operation> In this way, when the circuit elements are mounted on the board, at least one closed circuit included in the circuit network is an open circuit, so the circuit elements mounted in the circuit are By measuring the characteristic values at both ends, it is possible to accurately measure the circuit element, and evaluation and trimming can be performed based on this.

<Example> An example of this invention will be described with reference to FIG. 2 and subsequent figures. FIG. 2 is a front view of the integrated circuit board according to this invention, and FIG. 3 is a back view of the integrated circuit board, and each figure shows the circuit shown in FIG. 1 mounted. That is, the resistors R ₁ to _{R 8} shown in FIG.
As shown in FIG. 3, resistors R ₁ to _{R 8} are formed on the surface of an insulating substrate B. Note that each resistor is made of a thick film as described above.
T ₁ to T ₅ and T ³ ′, T ₄ ′ are terminals, and D is a conductor.
As can be understood from the figure, the resistor _R6 is formed on the back side of the substrate B, as shown in FIG. 3, independently of the other resistors R4, R5 and R7 that constitute a closed circuit.
Both ends thereof are connected to terminals T3' and T4'. Other resistors are made on the surface of the substrate B in an arrangement as shown in FIG. Terminals T ₁ to _{T 5} are also formed on the surface. The terminals T ₃ and T ₄ are located opposite to the terminals T ₃ ′ and T ₄ ′ on the front and back surfaces of the substrate B, and are connected to each other by clip terminals to be described later.

As understood from FIG. 1, the resistors R ₄ to _{R 7} constitute a closed circuit, and at least one of the resistors R ₄ to _{R 7} constituting this closed circuit, in this embodiment In this case, resistor R6 is connected to other resistors R4, R5 and
Since it was formed on the back side of board B independently from R7,
Unless the terminals T ₃ , T ₃ ′ and T ₄ , T ₄ ′ are connected together, the resistors R ₁ to R ₇ do not form any closed circuit. Therefore, the resistance values of each of the resistors R ₄ to R ₇ can be measured separately in the same way as other resistors, that is, resistors that do not form a closed circuit. In other words, it is sufficient to place the terminals of the measuring device on both ends of each resistor and measure it. Trimming is also possible while measuring the resistance value in the same way.

Measure the resistance value for each resistor as above,
After performing the necessary trimming, attach a clip terminal CR to each terminal. This includes bifurcated clip portions m ₁ and m ₂ , and the circuit board is mounted by holding the circuit board from both sides thereof. Then, if necessary, solder the contact portion between the clip portion and the terminal. In this case, terminals T ₃ and T ₃ ' are commonly connected by the same clip terminal. That is, since the terminals T ₃ and T ₃ ' contact the clip portions m ₁ and m ₂ of the same clip terminal, respectively, they are connected to each other. In this way, the required circuit network is completed at the stage of attaching the clip terminal CR. After attaching the clip terminals, the entire circuit board may be molded in resin.

Mounting resistors on the front and back surfaces of the circuit board as described above also provides the following advantages. In other words, when attempting to increase the packaging density by mounting a large number of resistors on a board with the same surface area, each resistor must be made small. However, if the resistance is reduced,
The amount of heat generated per unit area of the resistor increases, leading to early deterioration of the resistor. Also, when a large resistor is required, if this is mounted, the packaging density will naturally be reduced. However, if the front and back surfaces are used as in this invention, even if the same number of resistors are mounted on one board, the mounting density will not be reduced. Therefore, it becomes possible to reliably implement a resistor with desired characteristics.

Although the above embodiments have been described using resistors as circuit elements to be mounted, this idea can also be applied to other circuit elements such as capacitors, semiconductor elements, and semiconductor devices.

<Effects of the invention> As detailed above, according to this invention, each circuit element constituting a closed circuit can be easily measured without being affected by other circuit elements of the same closed circuit, and each circuit element can be easily measured without being affected by other circuit elements of the same closed circuit. The effect is that the packaging density can be sufficiently relaxed.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an example of a circuit network, Fig. 2 is a plan view showing an embodiment of this invention, Fig. 3 is a back view of the same, and Fig. 4 is a sectional view showing a state in which a clip terminal is attached. be. B...Substrate, _R1 to _R8 ...Resistance, _T1 to _T5 , _T3 ',
T ₄ '...Terminal, D...Conductor, CR...Clip terminal.

Claims (1)

[Scope of utility model registration request] An integrated circuit board in which a plurality of circuit elements are mounted on the surface of an insulating board and connected to form a circuit network including at least one closed circuit,
At least one circuit element among the circuit elements constituting the closed circuit is mounted independently on a surface opposite to one surface of the substrate on which other circuit elements are mounted, and the opposite side The closed circuit is constructed by connecting a terminal connected to a circuit element independently mounted on the surface of the circuit and a terminal connected to another circuit element mounted on the one surface with a clip terminal. integrated circuit board.