JPS596455Y2 - Microwave projection device for object detection device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a microwave projection device in an object detection device using microwaves.

Human body detection devices using microwaves have come to be used instead of photoelectric human body detection devices to obtain opening/closing operation signals for automatic doors.

The present invention relates to a microwave projection device in a detection device for a human body, etc. used in such a case, and aims to improve the noise resistance of the device and reduce the size of the device.

FIG. 1 shows a conventional microwave projection device.

In the figure, 1 is an electromagnetic horn, 2 is a cavity resonator, and the horn and the cavity resonator are coupled together, and this coupled body is fixed to a bracket 3, and the bracket 3 is fixed inside an outer casing 4.

A microwave oscillation element and a detection element are arranged within the cavity resonator 2, and these are connected to a printed circuit board 5 and lead wires 6, 6'.
etc. are connected.

A printed circuit board 5 is attached to the side of the bracket 3 within the outer casing 4.

With this structure, the oscillation element and detection element are separated from the printed circuit board, so the lead wires that connect them are long, and these lead wires pick up external noise, causing detection malfunctions due to noise. becomes more likely to occur.

Furthermore, the external size of the device also increases.

In this invention, the printed circuit board is attached to the U-shaped bracket that fixes the horn and the cavity resonator, and the bracket part is made into a box shape, thereby bringing the printed circuit board, which used to be apart from the bracket, closer to the cavity resonator. By doing this, the node wires connecting the oscillation element, the detection element, and the printed circuit are shortest, and the printed circuit board that was lined up next to the bracket is eliminated, making the overall structure more compact.

The present invention will be explained below with reference to Examples.

FIG. 2 shows an embodiment of the present invention.

1 is an electromagnetic horn, 2 is a cavity resonator, and both have a flange part f.
and is fixed to the bracket 3 by this flange.

Reference numeral 4 denotes an outer casing which has a cylindrical shape, and the legs of the bracket 3 are fixed to the bottom surface of the outer casing 4.

A microwave oscillation element and a detection element are arranged within the cavity resonator 2.

Bracket 3 has two notches at the top and bottom on both sides,
The mounting seats 3a are formed by bending inward between the notches, and the printed circuit board 5 is fixed to these mounting seats.

With this structure, the cavity resonator 2 is surrounded by a box shaped by the bracket 3 and the printed circuit board 5.

Although the fact that the cavity resonator is inside the box does not have any particular meaning, this structure allows the lead wires connecting the circuit of the printed circuit board 5 and the oscillation element and detection element within the cavity resonator to be the shortest.

Note that 7 is an IC for the power supply voltage stabilization circuit of the oscillation and detection circuit, and since it generates a considerable amount of heat, it is attached to the metal plate 8 of the heat sink. By being fixed to the seat 3a with screws 9, heat from the heat sink 8 is transferred to the bracket 3 through the screws 9.
, the heat radiation efficiency is even better than if the IC 7 were simply attached to the heat sink 8.

Although not shown, a flexible bracket is attached to the bottom (upper surface in the figure) of the outer casing 4, and is attached to a suitable location on the ceiling in front of the automatic door so as to face diagonally downward.

A part of the outside of the bottom surface of the outer casing 4 is cut out in a step-like manner, and a connection terminal 10 is provided on the vertical surface of the cutout, so that it can be connected to an external power source, a controlled load, etc. .

The microwave projection device for an object detection device of the present invention has the above-described structure, and since the lead wires connecting the oscillation element or detection element and the printed circuit are the shortest, there is no possibility that the node wires pick up external noise. This reduces the causes of malfunctions, and since the printed circuit board is integrated with the bracket, the entire device becomes compact, which is very desirable from the aesthetic point of view as a building interior (as an automatic door device).

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional example, and FIG. 2 is a perspective view of an apparatus according to an embodiment of the present invention. 1... Electromagnetic horn, 2... Cavity resonator, 3... Bracket, 4... Outer casing, 5
...Printed circuit board, 6,6'...
Lead.

Claims (1)

[Scope of utility model registration request] A mounting seat is formed by bending each side of two opposing brackets that fix the combination of an electromagnetic horn and a cavity resonator in which an oscillation element or a detection element is arranged to the outer casing, arranging a printed circuit board so as to span these mounting seats and fixing the board to the mounting seats, such that the cavity resonator is located within a space surrounded by the bracket and the printed circuit board; A microwave projection device for an object detection device, wherein the circuit of the printed circuit board and the oscillation element or detection element are connected by a lead wire.