JP2560625Y2 - GPS antenna - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile navigation device, and more particularly to an antenna for receiving radio waves from a satellite in a GPS (Global Positioning System).

[0002]

2. Description of the Related Art Conventionally, a microstrip type GPS antenna is covered with a synthetic resin radome because it is grounded outdoors, and it is not possible to know from outside that a GPS device is in operation.

[0003]

[Problems to be Solved by the Invention] This invention has been made in view of the above points, and its purpose is to make it possible to know from outside that the GPS device is operating, It is another object of the present invention to provide a GPS antenna which can determine at a glance whether or not the wiring of the antenna is normally connected.

[0004]

According to the GPS antenna of the present invention, a hole is formed in a radome that covers a microstrip antenna, and a light-transmitting member is arranged so as to cover the hole from inside the waterproof section to the surface of the radome. A light emitting element is attached to an end face of the translucent member in the section, and power is supplied to the light emitting element by a direct current supplied from a coaxial cable serving as a signal transmission path of the microstrip antenna. is there.

[0005]

According to the GPS antenna of the present invention, the light emitting element emits light by the direct current sent from the coaxial cable, and the light is guided to the translucent member to reach the surface of the radome, and the light of the translucent member on the radome surface is formed. Because the end face shines, GPS
It can be known from the outside of the antenna that the device is operating and that the wiring of the antenna is normal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A GPS antenna according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating a GPS antenna according to an embodiment. In the figure, reference numeral 1 denotes a radome made of a synthetic resin, which is fitted to the lower part 2 of the radome to define a space for accommodating the microstrip antenna 6.

[0007] The antenna holding member 8 to which the microstrip antenna 6 is attached is fixed to the radome lower part 2. A partition member 1a provided on the radome 1 presses a rubber 5a arranged in a groove in a lower portion 2 of the radome, and a waterproof section 5 is formed.

A hole is formed in the partition member 1a and the radome 1, and a translucent resin member 3 is arranged through the hole and fixed with an adhesive. The light emitting device 4 is attached to an end surface of the translucent resin member 3 in the waterproof section. The light emitting device 4 is formed by mounting an LED on a printed circuit board.
The light emitting surface of the ED is in close contact with the end surface of the translucent resin member 3. Reference numeral 7 denotes a coaxial cable which connects a circuit arranged in the radome 1 to a GPS receiver in the vehicle compartment.

FIG. 2 shows a circuit arranged in the radome 1. The series circuit of the coil L1, the resistor R1, and the LED is connected to the inner conductor and the outer conductor of the coaxial cable 7, and causes the LED of the light emitting device 4 to emit light by passing a DC current sent by the coaxial cable 7. The capacitor C1 connected between the LED anode and the outer conductor of the coaxial cable 7 suppresses noise generated from the LED.

A series circuit of the coil L2 and the capacitor C2 is connected to the inner conductor and the outer conductor of the coaxial cable 7, and separates a DC component from a voltage applied to the coaxial cable 7 to supply DC power to the amplifier 9. I do.

The ground plane of the microstrip antenna 6 is connected to the outer conductor of the coaxial cable 7, the power supply line is connected to the input terminal of the amplifier 9 via the capacitor C4, and the output terminal of the amplifier 9 is coaxial via the capacitor C3. It is connected to the inner conductor of the cable 7. The amplifier 9 amplifies the signal received by the microstrip antenna 6 and sends the signal to the GPS receiver in the vehicle cabin through the coaxial cable 7.

In the above configuration, when the GPS receiver operates, a direct current is supplied to the coaxial cable 7, the light emitting device 4 emits light, and the outer end surface of the translucent resin member 3 emits light. It can be confirmed from the outside of the antenna that the antenna is inside and that the wiring of the antenna is normal.

[0013]

[Effect of the invention] According to the GPS antenna of the invention, GP
It can be confirmed from the outside of the antenna that the S receiver is operating and that the antenna wiring is normal.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a GPS antenna according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a circuit used for the GPS antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radome 2 Radome lower part 3 Translucent resin member 4 Light emitting device 5 Waterproof section 6 Microstrip antenna 7 Coaxial cable 8 Antenna holding member 9 Amplifier

Claims (1)

(57) [Scope of request for utility model registration] A hole is provided in a radome covering a microstrip antenna, and a light-transmitting member is arranged so as to cover the hole from the inside of the waterproof section to the surface of the radome, and is provided on an end face of the light-transmitting member in the waterproof section. A GPS antenna provided with a light emitting element and configured to supply power to the light emitting element by a direct current supplied from a coaxial cable serving as a signal transmission path of the microstrip antenna.