JPH1070033A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable electronic apparatus without using a connector for electric connection between the front panel and the main body. SOLUTION: In an electronic apparatus where a front panel 3 including a display part and an operation part is coupled, capably of separation, with the main body 1, the electric coupling between the front panel 3 and the main body 1 is noncontact electric coupling (first and second coils 2a and 2b). Hereby, because this does not use a mechanical contact, this is not affected by dust or humidity at all, so the reliability increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to electronic equipment,
In particular, the present invention relates to an electronic device in which a display unit and an operation unit can be separated from a main body.

[0002]

2. Description of the Related Art In a vehicle-mounted electronic device, a display unit and an operation unit are formed separately from a main unit in the form of a front panel. A microcomputer in the main unit and a microcomputer, a display driver, and operation keys in the display unit are used. The electrical connection to was made via a contact-type connector. However, dust and moisture present in the interior of an automobile tend to stain or oxidize the contact surface of the connector.Therefore, when the connector comes into contact, the contact surface is rubbed, but the durability is limited. There was a disadvantage that it could not withstand long-term use. In addition, since signals are exchanged between microcomputers with a very weak current, if the surface of the contact becomes dirty or oxidized, it becomes a resistor, which is one of the causes of malfunction.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable electronic device without using a connector for electrical connection between a front panel and a main body.

[0004]

According to a first aspect of the present invention, there is provided an electronic apparatus in which a front panel including a display unit and an operation unit is separable from a main unit including a microcomputer. In the combined electronic device, the electrical connection between the front panel and the main body is made to be a non-contact electrical connection, eliminating mechanical contacts and improving reliability.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electronic device according to the present invention will be described below with reference to FIGS. The electronic device of the present invention is, for example, a tuner or the like for a vehicle. The main body 1 includes a receiving circuit, a microcomputer for channel selection, and the like, and the front panel 3 has a display device such as a liquid crystal and a key for channel selection. Etc. are provided. In the present invention, in particular, the first coil 2a is disposed on the front surface 1a of the main body 1, and the second coil 2b is disposed concentrically with the first coil 2a on the front panel 3 side coupled thereto. . A columnar projection 4 is provided at the center of the first coil 2a, and a hole 5 into which the projection 4 is fitted is provided at the center of the second coil 2b on the front panel 3 side.

When the projection 4 is fitted into the hole 5 on the front panel 3 when the front panel 3 is assembled to the main body 1,
The first coil 2a and the second coil 2b are accurately located and positioned with an appropriate gap.

FIG. 2 is a circuit diagram of a part of the electronic apparatus according to the present invention. The transistor T1 and the transistor T2 are cascaded, and the first transistor T2 is connected between the gate and the source of the transistor T2 via the transistor T1. A coil 2a is connected in series, a resistor 6 is connected in series to the second coil 2b, and a Schmitt circuit 7 is connected to both ends of the resistor 6. When data is input to the transistor T1, the transistor T1 is turned on, the transistor T2 is turned on, and a current flows through the first coil 2a. Then, a back electromotive force is generated in the magnetically coupled second coil 2b with a change in the magnetic field, and a current flows. As a result, a voltage is generated at both ends of the resistor 6, and this voltage is applied to the Schmitt circuit 7, and data is output when the voltage value exceeds a certain level. By performing such operations, non-contact data transmission becomes possible.

[0008]

Since the electric connection between the front panel and the main body is a non-contact electric connection, an electronic apparatus which is not affected by dust or moisture can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electronic apparatus according to the invention.

FIG. 2 is a circuit diagram of an electronic device according to the invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main part, 1a ... Front part, 2a ... First coil, 2b
... second coil, 3 ... front panel, 4 ... projection, 5 ...
Hole, 6… Resistance, 7… Schmitt circuit, T1, T2… Transistor

Claims (3)

[Claims] In an electronic apparatus in which a front panel including a display unit and an operation unit is separably coupled to a main unit including a microcomputer, a non-contact electrical connection between the front panel and the main unit is provided. Electronic equipment characterized by the following. 2. The electronic device according to claim 1, wherein said non-contact electric coupling is constituted by a first coil provided on said main body portion side and a second coil provided on said front panel side. machine. 3. A projection and a hole are provided at the center of the first coil provided on the main body and the second coil provided on the front panel. An electronic device according to claim 1.