JPH0639473Y2 - Printed circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a printed circuit board having a common board on which conductor patterns for forming a plurality of types of circuits are formed.

(Prior Art) In recent years, specifications of various electric devices have been diversified,
Many models are produced. For example, in dryers, there are models such as a sensor type that detects the drying rate of clothes and automatically terminates the drying operation, and a timer type that controls the drying operation with a timer switch. Including this, it will be even more diverse. Since the control circuits of these models have different functions from each other, conventionally, a dedicated printed circuit board has been manufactured for each control circuit. However, this requires a variety of printed circuit boards to be manufactured, resulting in poor production efficiency and high manufacturing costs.

Therefore, recently, even in a dryer, it has been considered to form a conductor pattern for forming two different types of circuits on a common substrate to share a printed circuit board between different types of models. . In this case, the common board is used only for a mounting area for components commonly used for a plurality of types of circuits, a mounting area for components used only for a sensor type control circuit, and a timer type control circuit. When a conductor pattern is formed so as to be divided into three parts mounting areas and a common part and a sensor type dedicated part are mounted, a sensor type control circuit is configured, and a common part and a timer type dedicated part are formed. When mounted, it is common to configure a timer type control circuit.

However, in the case of the above configuration, there is a case where dedicated components of each type are mounted together on the common substrate due to a work error. If soldering is performed without noticing this, defective products will be produced, and even if a component mounting error is discovered, it will take a great deal of time to correct it.

(Problems to be solved by the invention) In summary, in the conventional printed circuit board, if a dedicated board is manufactured for each model, the manufacturing cost increases. In addition to the possibility of defective products due to mounting mistakes, it is necessary to provide the printed circuit board with an area for mounting each dedicated component for each model, so the printed circuit board becomes large and the installation space becomes large. There was a problem.

The present invention has been made to solve the above-mentioned problems, and the purpose thereof is to be able to be shared by a plurality of models so as to reduce the manufacturing cost, yet to prevent the occurrence of component mounting errors, and to achieve miniaturization. Accordingly, it is an object of the present invention to provide a printed circuit board that can be installed in a small space.

[Structure of the Invention] (Means for Solving the Problems) In the printed circuit board of the present invention, a different function circuit can be selectively configured by changing a part of the parts on which a conductor pattern is mounted on a common board. In addition to the above, the characteristic feature is that the mounting areas of the dedicated parts for forming the different function circuits are formed at the same location on the common substrate.

(Function) Since different function circuits can be selectively configured by making some of the mounted parts different, one printed circuit board can be shared for multiple types of circuits, and a dedicated one for each model is manufactured. You don't have to. Moreover, in this case, since the mounting area for each dedicated component is formed at the same location on the common substrate, if the dedicated component for one type of circuit is mounted, the dedicated component for the other circuit cannot be mounted, and therefore, the error is erroneous. Therefore, there is no fear that defective parts will be manufactured by simultaneously mounting dedicated parts for two or more types of circuits. Moreover, as described above, the mounting area for each dedicated part is formed at the same location on the common substrate. The size of the printed circuit board can be reduced and the installation space does not become larger than the conventional one.

(Embodiment) An embodiment in which the present invention is applied to a printed circuit board for a dryer will be described with reference to the drawings.

Reference numeral 1 denotes a common substrate, on one surface (lower surface) of which a conductor pattern 2 is formed as shown in FIG. 2, and on the other surface (upper surface) which is a component mounting surface, as shown in FIG. The symbol of the mounted component is printed on. This printed circuit board is configured so that it can be used in common with a sensor type that detects the drying rate of clothes and automatically ends the drying operation, and a timer type that controls the drying operation time with a timer switch. , For that, a conductor pattern,
Both types of control circuits are formed so as to be selectively configured by making a part of mounted components different. Most of the mounted parts of both types are common, but the sensor type uses a transistor attached to a heat sink as a dedicated part, and the timer type uses a Zener diode and a resistor as dedicated parts instead of this. Is used. Reference numeral 3 in the drawing denotes a dedicated component mounting area, in which a transistor with a heat sink as a sensor type dedicated component or a Zener diode and a resistor as a timer type dedicated component are selectively mounted. That is, the mounting area of the sensor type dedicated component and the mounting area of the timer type dedicated component are formed so as to overlap with each other at the same location on the common substrate 1. Although each of these dedicated parts themselves is not shown, they are shown in FIG. 1 as printed symbols. In the figure, 4 is a heat sink, 5 is a transistor, 6 is a Zener diode, 7 is a symbol of resistance, and lead wire insertion holes for inserting lead wires of each component are shown for simplification of the drawing. Omitted. On the other hand, in FIG. 2, reference numeral 8 denotes a through hole formed in the common substrate 1 for penetrating the tip of the screw for attaching the transistor to the heat sink when attaching the heat sink to the common substrate 1. Is. Further, 9 is a caulking hole for attaching the heat sink.

Now, in order to configure a sensor type control circuit with the printed circuit board having the above configuration, for example, in addition to the common components commonly used for both types on the common substrate 1, the sensor type dedicated area 3 Equipped with a transistor with a heat sink as a component. Specifically, the transistor (symbol 5) with the heat sink (symbol 4) is arranged by attaching the heat sink to the dedicated component mounting area 3 of the common substrate 1,
The emitter terminal, collector terminal and base terminal of the transistor are projected to the lower surface side through the lead wire insertion hole,
Each is soldered to the lands 2e, 2f and 2g in the conductor pattern 2. As a result, the transistor is incorporated into a common circuit composed of a large number of other common components through a conductor pattern integrated with the lands 2e, 2f, and 2g, thereby forming a control circuit for the sensor type. . In this case, various designs are possible for the sensor type control circuit composed of the transistor and the common circuit, but basically, the drying rate of the clothes is detected and the drying operation is automatically terminated. It is a configuration that allows it. In the state where the heat sink and the transistor are mounted in this manner, as is clear from FIG. 1, the dedicated component mounting region 3 is occupied by the heat sink, so that the dedicated type of the timer type Zener diode and the resistor Mounting becomes impossible. On the contrary, when the control circuit for the timer type is to be formed, the Zener diode and the resistor, which are the dedicated components of the timer type, are mounted in the dedicated component mounting area 3 in addition to the common components. Specifically, the Zener diode (symbol 6) and the resistor (symbol 7) are arranged in the dedicated component mounting area 3 of the common substrate 1, and the anode terminal, the cathode terminal, and the resistor both terminals of the Zener diode are passed through the lead wire insertion hole. Project it to the bottom side,
Each of them is soldered to the lands 2a, 2b and 2c, 2d of the conductor pattern 2. As a result, the Zener diode and the resistor are connected to the land 2a, 2 in a common circuit composed of many other common components.
The control circuit for the timer type is configured by being incorporated through b and 2c, 2d via a conductor pattern which is integrated. In this case, various designs are possible for the timer-type control circuit composed of the Zener diode and the resistor and the common circuit, but basically, the dry operation is time-controlled by the time switch. . As described above, if the Zener diode and the resistor are mounted, the region 3 is occupied by the Zener diode and the resistor, so that the heat sink and the transistor cannot be mounted. As a result, it is possible to surely prevent both types of exclusive parts from being erroneously mounted together, and prevent defective products from occurring.

As described above, in the present embodiment, one dedicated printed circuit board of the sensor type and the timer type is provided by selectively making the dedicated component mounting area, which is a part of the printed circuit board, compatible with two types, which are a plurality of models. Since it can be used in common for both models, there is no need to manufacture a dedicated printed circuit board for each model, and the manufacturing cost is reduced accordingly. Moreover, since the mounting areas of the dedicated components of each type are formed at the same location on the common substrate 1, it is possible to reliably prevent the dedicated components of both types from being simultaneously mounted on the common substrate. Therefore, it is possible to prevent the occurrence of defective products due to component mounting errors. Further, as described above, since the mounting areas for the dedicated parts of each type are formed at the same location on the common substrate 1, it is possible to reduce the size as compared with the conventional case where the mounting areas for the dedicated parts of each type are respectively formed. Installation space can be reduced.

In addition, although the example applied to the printed circuit board for the dryer is shown in the above-described embodiment, the present invention is not limited to this, and the present invention can be applied to the printed circuit board for constituting a circuit of other electric equipment. Of course. Further, the present invention is not limited to the case where two types of circuits are formed on the common substrate, but can be applied to the case where three or more types of circuits are formed.

[Advantages of the Invention] As described above, the present invention allows different functional circuits to be selectively configured by making some of the mounted parts different, and also enables each functional circuit to be configured. The feature is that the mounting area for the dedicated parts is formed at the same position on the common substrate, and as a result, one printed circuit board can be commonly used to form a plurality of circuits, and the manufacturing cost can be reduced. Moreover, it is possible to reliably prevent defective products due to component mounting errors, and it is possible to reduce the size of the printed circuit board and to reduce the installation space.

[Brief description of drawings]

The drawing shows one embodiment of the present invention, FIG. 1 is a plan view, and FIG.
The figure is a bottom view. In the drawing, 1 is a common substrate, 2 is a conductor pattern, and 3 is a dedicated component mounting area.

Claims (1)

[Scope of utility model registration request] 1. A conductor pattern for forming a plurality of types of circuits having different functions from each other is formed on a common substrate, and the conductor pattern is formed by making a part of mounted components different so that a different function circuit is provided. And a mounting area for each dedicated component for forming each of the different function circuits is formed at the same location on the common board.