JP2004281565A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily discriminate models of electronic apparatuses without using a large number of parts. <P>SOLUTION: An electronic apparatus is equipped with a case body 1 which contains a circuit 4. A power source terminal 2a for feeding a power supply voltage to the circuit 4, a grounding terminal 2b, and a model discriminating terminal 5 not related to the circuit 4 are provided to the case body 1 protruding outward from it. A resistor 6 connected between the model discriminating terminal 5 and the grounding terminal 2b or between the model discriminating terminal 5 and the power supply terminal 2a is provided in the case body 1. The resistor 6 is varied in resistance with each model of the electronic apparatus, so that a voltage appearing across the resistor 6 can be used to discriminate the model of the electronic apparatus. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic device that can easily perform model identification.
[0002]
[Prior art]
Conventional electronic devices will be described with reference to FIG. A model display unit 10 is provided on a component mounting surface of a common substrate used for electronic equipment. The model display unit 10 includes a pad 12 for mounting a chip component for model identification in a print frame 11, for example, a vertical position. The width between the pads 12 arranged in the vertical direction and the horizontal direction is the same as the length of the chip component.
[0003]
Then, the chip components 15A, 15B, 15C, and 15D for model determination are selectively arranged on the pads 12 arranged in two rows and two rows. However, the vertical and horizontal arrangement patterns of the model identification chip components 15A to 15D are arranged such that the chip components do not overlap on the same pad 12. For example, since the mounting of the chip components 15A and 15D uses the upper right common pad 12, only one of 15A and 15D can be mounted.
[0004]
Here, the placement type that is the arrangement pattern of the model identification chip components 15A to 15D is expressed using the symbols of patterns A, B, C, and D. Only, A and B, C only, D only, C and D, none (no chip equipment 15A to 15D). That is, seven types of models can be determined (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-238952 (FIG. 2)
[0006]
[Problems to be solved by the invention]
In the above conventional example, when the number of models increases, the number of chip components and the number of pads for attaching them must be increased. Therefore, the area of the substrate is inevitably increased. In addition, the number of man-hours required for mounting a large number of chip components increases. In addition, since mounting positions of chip components are diversified, mounting errors are easy to place.
[0007]
An object of the present invention is to solve these problems and to make it possible to easily determine the model without using a large number of components.
[0008]
[Means for Solving the Problems]
In order to solve the above excessiveness, the electronic device of the present invention has a case main body in which a circuit is configured, and the case main body includes a power supply terminal and a ground terminal for supplying a power supply voltage to the circuit; Is provided with an unrelated model identification terminal protruding outward, and a resistor connected between the model identification terminal and the ground terminal or between the model identification terminal and the power supply terminal is connected to the case. It was provided in the main body, and the resistance value of the resistor was different for each model.
[0009]
Further, the ground terminal, the power supply terminal, and the model identification terminal are provided at predetermined positions on the same side surface of the case body.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An electronic device according to the present invention will be described with reference to FIGS. In FIG. 1, a high-frequency electronic device such as a transmitter / receiver includes a main body case 1 and a plurality of terminals 2 attached to one side of the main body case 1. Is provided with a predetermined circuit (high-frequency circuit) 4. All the terminals 2 are connected to the high frequency circuit 4. Among these terminals 2, the terminal 2a is a power supply terminal for supplying a power supply voltage to the high frequency circuit 4, the terminal 2b is a terminal for pairing with the power supply terminal 2a and grounding the high frequency circuit 4, and the terminal 2c. Is a terminal for outputting a signal from the high frequency circuit 4, and a terminal 2d is a terminal for inputting a signal to the high frequency circuit 4 from the outside. The mounting positions of the terminals 2a to 2d are determined for each product (transmitter / receiver) for these purposes.
[0011]
In addition to the terminals 2, measurement terminals (model identification terminals) 5 that are not related to the high-frequency circuit 4 are independently attached to the same side surface. Then, a resistor 6 connected between the model determination terminal 5 and the ground terminal 2b is provided on the circuit board 3. The resistance value of the resistor 6 has the same value for the same model, and the resistance value differs for different models. For example, in the case where standards and performances are different due to different destinations, another model is used.
[0012]
The electrical performance of the electronic device thus configured is checked by the measuring jig 7. For the measurement, the measuring jig 7 is provided with terminals 8 that respectively contact the terminals 2 and 5 of the electronic device, and a power supply voltage is supplied from these terminals 8. That is, a power supply voltage E is externally applied between the power supply terminal 8a and the ground terminal 8b, and the two terminals 8a and 8b come into contact with the power supply terminal 2a and the ground terminal 2b of the electronic device, respectively. The circuit 4 is supplied with a power supply voltage. In the measuring jig 7, a voltage is applied to the model identification terminal 8 c via the resistor 9, and the terminal 8 c contacts the model identification terminal 5 of the electronic device. Then, a divided voltage V by the resistor 9 provided in the measuring jig 7 and the resistor 6 provided in the electronic device appears on the model determination terminal 8c. The model is determined by measuring the divided voltage V. The measuring jig 7 is of course used not only for this type determination but also for measuring the electrical performance.
[0013]
FIG. 2 shows a state where the mounting position of the resistor 6 in the electronic device is changed. That is, the resistor 6 is connected between the model identification terminal 5 and the power supply terminal 2a. Correspondingly, in the measuring jig 7, the resistor 9 is connected between the ground terminal 8b and the model determining terminal 8c. Even in this case, a divided voltage can be obtained by the resistor 6 in the electronic device and the resistor 9 in the measuring jig 7.
[0014]
By fixing the mounting positions of the power supply terminal 2a, the ground terminal 2b, and the measuring terminal 5 at predetermined positions for each product, a common measuring jig 7 can be used regardless of the model.
It is needless to say that the model can be determined by measuring the resistance value itself instead of the voltage measurement described above.
[0015]
【The invention's effect】
As described above, the electronic device of the present invention has a case main body in which a circuit is formed. The case main body includes a power supply terminal and a ground terminal for supplying a power supply voltage to the circuit, and a model discrimination that is not related to the circuit. Terminals protruding outward, and a resistor connected between the model identification terminal and the ground terminal or between the model identification terminal and the power supply terminal is provided in the case body, and the resistance value of the resistor is set. Since the difference is made for each model, it is possible to easily determine the model by detecting the voltage appearing at the resistor. In this case, since the resistance value is changed, the cost does not increase even if the number of models increases.
[0016]
In addition, since the ground terminal, the power supply terminal, and the terminal for model determination are provided at predetermined positions on the same side surface of the case body, a common measurement jig can be used even if the model is changed.
[Brief description of the drawings]
FIG. 1 is a circuit diagram illustrating a configuration of an electronic device of the present invention.
FIG. 2 is another circuit diagram illustrating a configuration of the electronic apparatus of the present invention.
FIG. 3 is a pattern diagram of a substrate used for discriminating a model of a conventional electronic device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body case 2 Terminal 2a Power supply terminal 2b Grounding terminal 3 Circuit board 4 High frequency circuit 5 Model identification terminal 6 Resistance 7 Measurement jig 8 Terminal 8a Power supply terminal 8b Ground terminal 8c Model identification terminal 9 Resistance

Claims (2)

It has a case main body in which a circuit is formed, and a power supply terminal and a ground terminal for supplying a power supply voltage to the circuit, and a model identification terminal unrelated to the circuit are provided on the case main body so as to protrude outward. A resistor connected between the model identification terminal and the ground terminal or between the model identification terminal and the power supply terminal is provided in the case main body, and if a resistance value of the resistor differs for each model, Electronic equipment characterized by having been made. 2. The electronic device according to claim 1, wherein the ground terminal, the power terminal, and the model determination terminal are provided at predetermined positions on the same side surface of the case body.

Images