JPH0432807Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a parabolic reflector.

Parabolic reflectors are used for transmitting and receiving radio waves such as SHF band radio wave reception of satellite broadcasting and CATV reception. Parabolic reflectors have a wide reflective surface for radio waves, so they should be stacked when stored or transported. As shown in Figures 1 and 2, a conventional parabolic reflector has a reinforcing base 2 that is concentric with the outer periphery of the reflector plate 1 at the center of the back surface of the reflector plate 1, and when stacked together, it creates a structure as shown in Figure 3. The reinforcing stand 2 of the lower parabolic reflector comes into contact with the reflector plate 1 of the upper parabolic reflector, causing distortion in the radio wave reflecting surface of the parabolic reflector and degrading the transmitting and receiving performance of the antenna. In order to stack parabolic reflectors without placing a load on the radio wave reflecting surface of the parabolic reflector, an outer flange facing backward from the radio wave reflecting surface is provided on the entire outer periphery of the parabolic reflector, perpendicular to the antenna plane, and the base end side of the outer flange is provided. forming a stacked stepped portion that is concentric with the inner diameter on the tip side of the outer circumferential flange, has a diametrical dimension slightly smaller than the inner diameter on the tip side of the outer circumferential flange, and has a central axis dimension of the outer circumferential flange slightly larger than the thickness of the parabolic reflector reflecting surface; The stacking step portion is engaged with the tip end side of the outer peripheral flange of the lower parabolic reflector, and the mirrors are stacked one after another. When stacking a large number of parabolic reflecting mirrors, each reflecting mirror may shift horizontally one by one, leading to the risk of the load being dislocated. In addition, especially for offset-type parabolic reflectors, the outer periphery of the reflector is not a perfect circle but an ellipse with a difference in major and minor axes, and parabolic reflectors are manufactured in large numbers due to slight manufacturing errors. It is difficult to manufacture them in exactly the same shape, and it is also difficult to stack a large number of parabolic reflecting mirrors in the same horizontal position, making it difficult to make their outer peripheries and central axes coincide. If they are stacked without their outer peripheries and central axes being perfectly aligned, the outer peripheries will be strained, making it difficult to stack a large number of mirrors, and furthermore, it will not be easy to remove the stacked parabolic reflectors. Therefore, in the present invention, an outer circumferential flange facing rearward from the radio wave reflecting surface is provided on the entire outer circumference of the parabolic reflector, perpendicular to the antenna plane, and a radial dimension is provided on the base end side of the outer circumferential flange, which is concentric with the inner diameter on the tip side of the outer circumferential flange. is a little smaller than the inner diameter on the tip side of the outer peripheral flange, the dimension in the central axis direction of the outer peripheral flange is slightly larger than the thickness of the parabolic reflector reflecting surface, and a stacked step part is formed that does not interfere with the radio wave reflecting surface of the parabolic reflector stacked in the upper layer, One or more positioning protrusions are provided protrudingly on the circumference of the stepped portion, and the positioning protrusions and the positioning protrusions are fitted at the same position on the circumference in the direction of the central axis of the outer circumferential flange on the distal end side of the outer circumferential flange. It is provided with a notch-shaped receiving part.

Hereinafter, the present invention will be explained in detail based on specific embodiments shown in FIGS. 4 to 7.

A reflective surface 9 is provided over the entire outer circumference of the parabolic reflector 3.
An outer periphery flange 4 is provided which faces rearward relative to the antenna and stands perpendicularly to the antenna plane 10.
The diameter of the proximal end 4a of the outer peripheral flange 4 is smaller than that of the distal end 4b, and a stacking step 5 is formed in the middle of the outer peripheral flange 4. Base end side 4 of outer peripheral flange 4
a and the distal end 4b have the same dimensions over the entire circumference in the direction of the central axis of the outer flange, and the difference between the outer diameter of the distal end 4b and the outer diameter of the proximal end 4a in the diametrical direction is the thickness of the outer flange distal end 4b. If the thickness is set to be slightly larger than twice the thickness t, it is easy to stack the parabolic reflectors. The dimension h in the central axis direction of the outer peripheral flange of the stacking step portion 5 is the parabolic reflector reflecting surface 9
Form it slightly larger than the thickness of. Note that the proximal end 4a and distal end 4b of the outer peripheral flange 4 become slightly tapered surfaces when a draft angle is required during manufacturing. Furthermore, if a cylindrical reinforcing rib 6 that is concentric with the outer periphery of the reflecting plate 3 is protruded from the center of the back surface of the reflecting plate 3, the length of the outer peripheral flange 4 from the outer periphery of the radio wave reflecting surface 9 will be the same as the length from the radio wave reflecting surface 9 of the reinforcing rib 6. Set it so that it is longer than the length of . Specifically, the length of the reinforcing rib 6 is L', the thickness of the reinforcing rib 6 in the central axis direction of the outer flange of the reflector 3 is t', the length of the outer flange 4 is L, and the step of the outer flange 4 is When the length of the outer peripheral flange of the portion 5 in the central axis direction is h, it is set so that L-h>L'+t', so that the reinforcing rib 6 does not interfere with the reflecting plate 3 above.

7 and 8, and 9 and 1 on the stacking step 5.
A positioning protrusion 7 as shown in FIG. The shape of the positioning protrusion 7 may be a square prism or any other shape. Furthermore, positioning protrusions 7 are provided at locations where the circumference is equally divided into four as shown in FIGS. 4 and 5. However, the positioning protrusion 7 is provided at an arbitrary position on the circumferential step portion 5, and the positioning protrusion 7
The number of protrusions may be one or may be any number of two or more. On the other hand, a receiving portion that fits into the positioning projection 7 is provided on the distal end side 4b of the outer peripheral flange 4 at the same position on the circumference in the direction of the center axis of the positioning projection 7 and the outer peripheral flange. As the receiving part, a notch 8 can be carved as shown in the figure, or a hole, a recessed part, etc. can be formed.
The number of receiving parts installed is the same as the number of positioning protrusions 7.
The notch 8 and the protrusion 7 are provided at the same position on the circumference in the direction of the central axis of the outer peripheral flange 4, as shown in FIG.

As shown in FIG. 11, this parabolic reflector is constructed by engaging the stepped portion 5 with the tip end 4b of the outer peripheral flange 4 of the lower parabolic reflector, and at the same time fitting the notch 8 of the receiving portion into the positioning protrusion 7. Match them and stack them one after another.

In actual manufacture, parabolic reflecting mirrors may not be formed into a perfect circular shape, and they may also be stacked diagonally rather than horizontally, making the fit between the parabolic reflecting mirrors tight. In particular, offset type parabolic reflectors are ellipsoids with a difference in their major and minor axes, and if they are stacked without their outer circumferences and center axes completely matching, the outer circumferences will become strained and it will be difficult to stack a large number of mirrors. Positioning for stacking is necessary because it is difficult and difficult to remove stacked parabolic reflectors. It goes without saying that parabolic reflectors include offset type parabolic reflectors.

As described above, the present invention provides an outer flange extending rearward from the radio wave reflecting surface on the entire outer periphery of the parabolic reflector, perpendicular to the antenna plane, and a flange concentric with the inner diameter on the tip side of the outer flange on the base end side of the outer flange.
The stacked step part has a diametrical dimension slightly smaller than the inner diameter of the outer flange tip, a central axis dimension of the outer flange that is slightly larger than the thickness of the parabolic reflector reflecting surface, and which does not interfere with the radio wave reflecting surface of the parabolic reflector stacked on top. 1 on the circumference of the stepped portion.
In addition to protruding one or more positioning protrusions, a cutout-shaped receiving part is provided on the distal end side of the outer flange to fit with the positioning protrusion and the positioning protrusion at the same position on the circumference in the direction of the central axis of the outer flange. Since it is a parabolic reflector, the load of the parabolic reflector is applied to the strong outer flange, and it is possible to stack the parabolic reflectors without putting any load on the radio wave reflecting surface, and it is possible to stack the parabolic reflectors during storage and transportation. There is no deterioration in the transmitting and receiving performance of the antenna due to distortion on the radio wave reflecting surface. Furthermore, since the receiving part of the upper parabolic reflector is fitted into the positioning protrusion of the stepped part, it can be prevented from rotating, and there is no risk of the cargo falling apart. Since they are stacked one above the other, even if they are offset type parabolic reflectors, the stacked parabolic reflectors can be easily removed. Furthermore, the present invention is relatively simple, with a stepped portion on the outer flange, a positioning protrusion on the stepped portion, and a receiving portion on the tip of the outer flange, so it can be easily implemented and the parabolic reflector retains antenna performance. can be provided at low cost.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional parabolic reflector; Figure 1 is a plan view thereof, Figure 2 is a cross-sectional view of Figure 1;
Figure 3 is a vertical sectional view showing the stacked state, Figure 4-
Fig. 12 shows a specific embodiment of the parabolic reflector of the present invention, Fig. 4 is a plan view thereof, Fig. 5 is a side view of Fig. 4, Fig. 6 is an enlarged vertical sectional view of the main part, and Fig.・Figure 8 shows the positioning protrusion, Figure 7 is its side view, Figure 8 is its bottom view, Figures 9 and 10 show other positioning protrusions, Figure 9 is its side view, and Figure 10 is its bottom view. Figure 11 is a vertical cross-sectional view showing the stacked state;
FIG. 12 is an enlarged perspective view of the main parts of FIGS. 7 and 8. 4...Outer flange, 5...Step for stacking,
4b...Tip side, 8...Notch (receiving part), 7...
Positioning protrusion, 9... Radio wave reflecting surface, 4a... Base end side, 10... Antenna plane.

Claims (1)

[Scope of utility model registration request] An outer flange facing rearward from the radio wave reflecting surface is provided on the entire outer periphery of the parabolic reflector, perpendicular to the antenna plane, and on the base end side of the outer flange, the outer flange is concentric with the inner diameter on the tip side of the outer flange, and has a diametrical dimension that is the inner diameter on the tip side of the outer flange. A stacked step portion is formed, which is slightly smaller than the outer peripheral flange, and whose central axis direction dimension is slightly larger than the thickness of the parabolic reflector reflecting surface, and which does not interfere with the radio wave reflecting surface of the parabolic reflector stacked on the upper layer, and the circumference of the step portion is slightly smaller than that of the parabolic reflector. one or more positioning protrusions protrudingly provided on the top, and a cutout-shaped receiving part that fits with the positioning protrusions at the same position on the circumference in the direction of the center axis of the outer flange on the distal end side of the outer periphery flange; A parabolic reflector characterized by being provided with.