JPH0432805Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field of the Invention The present invention relates to an improvement of an antenna support section comprising a rotating parapet surface reflector.

(2) Prior art and problems The antenna of a relatively small wireless device used for ultra-high frequency such as microwave band or millimeter wave band and short-range communication uses a rotating parapet surface reflector because of its ease of handling and good performance. An aerial is used.

The antenna is integrated for ease of manufacture, transportation, storage, etc., and has a configuration that allows easy attachment and detachment from the wireless device. A first conventional example is shown in FIG. This figure shows that when the reflector 1 itself is directly sandwiched between the flange 7 and the wireless device 13, a gap is created between the reflector 1 and the flange 7 or the wireless device 13 because the reflector 1 is curved, and moreover, Since it is fixed at a fixed point, it tends to bend in the direction shown by the arrow, and there is a risk of vibration or deformation due to excessive external force. Therefore,
Some use reinforcing metal fittings with high rigidity. This is the conventional example shown in FIGS. 1st
As shown in the side cross-sectional view of the figure, the rotary bar surface reflector 1, which is circular in front view, has a hole 2 formed in the center, and a plate-shaped reinforcing metal fitting 3 attached to the bar surface on the back side is caulked around it with rivets 4. The feed waveguide 6 of the primary radiator 5 is attached to the center of the reinforcing metal fitting 3 through the hole 2 by a flange 7. The reinforcing metal fitting 3 has a flat back surface 9 and is provided with a screw hole 10 for connecting and attaching a wireless device, and is connected with a screw through this screw hole 10, but it is difficult to screw in the screw from the back side. In this case, the hole 2 should be enlarged as shown in FIG.
is provided on the circumference of the reflector 1 and is attached by inserting a screw 12 from the opening side of the reflector 1.

However, in the above-mentioned product, the reinforcing metal fittings 3 with high rigidity are attached to the back side, and the mounting rivets are also placed on the outer periphery, so it is difficult to subtotal or measure the entire item, and it is also undesirable from a cost perspective. There is a problem.

(3) Purpose of the invention In view of the above-mentioned conventional problems, the object of the present invention is to provide an antenna that does not require additional parts and has a sufficiently stable strength at the mounting part.

(4) Structure of the device In order to achieve the above object, the gist of the structure of the device of the present application is a rotating rod surface of a sheet metal material through which the feeder wire for the primary radiator passes through the center, and which is supported by the radio device at the center of the back surface. The antenna is composed of a reflecting mirror, and the supporting part of the rod surface reflecting mirror is integrally formed with a circular reinforcing recess or reinforcing projection in either direction forward or backward from the rod surface, and the flat bottom surface of the reinforcing recess or reinforcing projection is The reason is that the flat mounting surface of the flange is closely fixed.

(5) Examples of the invention Hereinafter, the invention will be specifically explained by examples based on the outline of the invention and with reference to the drawings.

FIG. 4 is a side cross-sectional view of only the main parts of one embodiment of the antenna of the present invention.

Note that the antenna in this invention refers to a transmitting device, a receiving device, a device capable of both transmitting and receiving, and a device used in a measuring device using radio waves.
The reflecting mirror 21 is made of a circular rotating parapet surface when viewed from the front.
A feeding waveguide 23 of the primary radiator 22 is located at the bottom or center.
A flange 25 is provided on the back side of the recess passing through the hole 24, and a primary radiator 22 is provided on the front side of the recessed portion.

The flange 25 has a plurality of stages in its outer shape, with a first stage 26 having the largest diameter and a third stage 2 having the smallest diameter.
A bag-shaped nut 29 is fitted between the second stage 27 and the second stage 27, and can be screwed to the feeder wire coupling screw 30 of the wireless device. The flat end surfaces 31 of the second stage 27 and the third stage 28 and the reinforcement part 33 of the reflecting mirror
A plurality of screws 32 screw the screws to the flat mounting surface of the screws 32 .

Here, the reflecting mirror 21 has a reinforcing convex portion 33 protrudingly formed on the rear side at a height H at the center portion of the bottom surface of the mirror 21 corresponding to the end surface 31 . That is, it becomes more concave when viewed from the front side.

With the above configuration, a cylindrical wall surface is formed around the screw 32 of the reflector 21 by drawing press processing of the reflector 21, so that the bending and deflection at this part, which is conventional, is significantly reduced. At the same time, the strength is increased and deformation is also prevented. Therefore, it can resist some external force or wind force.

This reinforcing convex portion 33 is located at the center, and does not have a large practical electrical effect when comparing the area of the entire reflecting mirror.

Further, the length of the feeder wire is determined so as to compensate for the height H of the reinforcing convex portion 33 for the mutual focal distance between the reflecting mirror 21 and the primary radiator.

The convex portion may be one step as shown in the figure, but there may also be a reinforcing convex portion on the outside, that is, a two-step shape or even three steps.
If it is made into a stepped shape, the strength will be further increased. In this case, the reinforcing convex portion is not limited to a cylindrical shape, but may be trapezoidal (tapered). However, it should be determined appropriately based on the electrical influence, ie, the ratio to the size of the reflecting mirror.

In a different embodiment of the present invention, although not shown, the reinforcing convex portion 33 is made to protrude toward the concave surface (front) side of the reflecting mirror 21, contrary to FIG. 4, to form a reinforcing concave portion. That is, it has a concave shape when viewed from the back side. In this case, the length of the second stage 27 of the flange is formed to be long. Thus, in both embodiments, a rotational positioning means, such as a pin and hole fitting means, is provided between the flange 25 and the coupling part 30 of the device. In addition, the primary radiator 22 and the feeding waveguide 23 are integrated, and a flange is provided at the end thereof, and the flange 25 is fixed to the reflecting mirror 21 as a flange-like metal fitting, and the flange at the end of the feeding waveguide is twisted. If they are removably connected, the primary radiator and feeder wires will not protrude from the reflector by removing them during transportation or storage, making them less bulky and preventing damage.

(6) Effects of the invention As described above, in the antenna of the invention, the central support part of the reflector is integrally formed with a circular reinforcing concave part or reinforcing protrusion part by sheet metal processing in either direction of the front or back of the projecting surface. By fixing the support to the removable flange member of the radio device at the bottom of the recess or reinforcing convex part, the support strength of the reflector can be greatly increased compared to the conventional one, and it is a practical solution that does not require additional parts. The effect is remarkable.

[Brief explanation of the drawing]

FIG. 1 is a side cross-section of a conventional antenna, FIG. 2 is a cross-section of a different main part of the conventional antenna, FIG. 3 is a cross-section of a still different main part, and FIG. 4 is a schematic side cross-section of an embodiment of the antenna of the present invention. In the figure, 21 is an antenna, 22 is a primary radiator, 23 is a feed waveguide, 25 is a flange, 26, 27, 28
is a step, 29 is a bag-shaped nut, 30 is a threaded part, 32
Reference numeral 33 indicates a screw, and 33 indicates a reinforcing convex portion.

Claims (1)

[Scope of utility model registration request] An antenna consisting of a rotating rod surface reflector made of a sheet metal material through which a feeder wire for a primary radiator passes through the center, and which is supported by a radio device at the center of the back, and the supporting portion of the rod surface reflector is located at either the front or rear of the rod surface. An antenna characterized in that a circular reinforcing recess or reinforcing projection is integrally formed in the direction of , and the flat bottom surface of the reinforcing recess or reinforcing projection is tightly fixed to the flat mounting surface of the flange.