JPS6192003A - Reflecting plate - Google Patents

Abstract

PURPOSE:To attain excellent rigidity and to prevent the titled plate from being swollen with the wind by constituting the antenna with the reflecting plate and a delay exciting means, providing a step to the reflecting plate and forming the plate in nearly flat form. CONSTITUTION:Ring reflecting faces 1a-7a of the reflecting plate A have an equal face as a parabolic face of a virtual parabolic face reflector B and arranged on the same plane. Since each ring reflecting plane is corrected respectively by steps 8-13, the parabolic face of the parabolic face reflector B of the virtual shape is formed into nearly flat plate incorporatedly as it is. Plural through-holes 14 with a proper size are formed respectively to each step at a proper interval. A radio wave is reflected toward a prescribed position (focus) near a focus P respectively at each reflecting face fitted with a backup holder at the rear face of the circular reflecting plate A. The focus point is provided with a reception section excited only with the radio wave component reflected on each reflection face and an output from each reception part is superimposed via a delay circuit delaying it for a prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflector plate used in an antenna for sensing extremely high frequency television waves.

Parabolic antennas (parabolic reflectors) have conventionally been used to sense extremely short wavelength television radio waves, which have short wavelengths in the same way as light. This parabolic 7 antenna is made of a metal plate curved into a dish shape, and because it is a shape that easily traps wind,
Easily deformed by wind.

An antenna device designed to solve this problem is disclosed in Japanese Patent Laid-Open No. 46-35951. That is, a concave main reflecting mirror having a mirror axis and an opening at the apex, and a sub-reflecting mirror facing forward of the main reflecting mirror and provided on the same mirror axis, and a plurality of the main reflecting mirrors are provided. are divided into divided reflecting mirrors, and each divided reflecting mirror is formed in the shape of a step with the outer peripheral side protruding forward from the center side, and a gap is formed between each divided reflecting mirror, and the reflecting surface of the sub-reflecting mirror is connected to the main reflecting mirror. It is divided into the same number of divided reflecting surfaces corresponding to the reflecting mirrors and is shifted in the direction of the mirror axis by the same amount as each of the divided reflecting mirrors corresponding to the plurality of divided reflecting surfaces. It is something.

However, in this antenna device, each reflector is divided into sections, and is formed in a step-like shape with the outer periphery shifted forward from the center side, so a complicated process is required to hold each divided reflector in the proper position. Mass production was difficult because a shape holding member was required, careful adjustment was required for two-position adjustment, and a plurality of five-segment reflecting mirrors were required.

The present invention has been made in view of these problems.

It is an object of the present invention to provide a reflector plate that reduces wind pressure resistance and has a simplified structure for holding an antenna.

The reflector of the present invention is integrally molded with a plate body, and has a reflective part divided in concentric circles from the center to the outer periphery,
Each reflective part except the center and outermost periphery.

The inner edge is connected to the outer edge of the reflective part adjacent to the center side of the reflective part via the stepped part, and the outer edge is connected to the inner edge of the reflective part adjacent to the outer peripheral side of the reflective part via the stepped part. Moreover, the inner edges of each reflecting section are located on the same plane.

Embodiments of the present invention will be described below based on the drawings.

The central cross-sectional shape of a conventional parabolic antenna (parabolic reflector) is an imaginary shape shown by the chain line in FIG.

The reflector A of the present invention is obtained by forming the entire reflector into a substantially planar plate while leaving the paraboloid of the parabolic reflector B unchanged. That is, the parabolic surface (1) of the conventional parabolic reflector B is used as the first annular reflecting surface (1a) in the reflector A of the present invention, and the portion (2) is the first annular reflecting surface (1a). 1a) to the step part (
8) to form a second annular paraboloid (2a), and further (3
) is provided with a stepped portion (9) from the second annular paraboloid (2a) to form the third annular reflective surface (3a).

In this way, the paraboloids (1) to (7) of the parabolic reflector B are integrally formed into a substantially planar plate shape with stepped portions (8) to (13) sequentially provided. Therefore, (1
Each annular reflecting surface from a) to (7a) is a parabolic reflector B.
This is a planar reflecting plate A having a surface equal to the paraboloid of and disposed on the same plane. Each of the annular reflecting surfaces (1a) to (7a) has been modified by the step portions (8) to (13), respectively, so the paraboloid of the parabolic reflector B in the imaginary shape shown by the chain line remains as it is. It can be formed integrally with a planar plate. A plurality of through holes (14) of appropriate size are formed at appropriate intervals in each stepped portion. In addition, in one drawing (1
A through hole (14) is provided in each of the step portions from 0) to (13), but it goes without saying that similar through holes may also be formed in each of the step portions (8) and (91). The back side of the circular reflector A thus constructed is reinforced by attaching, for example, a cross-shaped frame (15) as a bank amplifier holder, and the radio waves radiated and concentrated at the focal point P by the reflector A are placed in the center. A conduit (16) is attached to collect and guide the waves to form an antenna.

The radio waves are reflected toward a predetermined location near the focal point P by each reflecting surface having the above configuration. To align the phases of the radio waves reflected by each reflecting surface, 1. For example, provide a receiving section that excites only the radio wave component reflected by each reflecting surface, and delay the output from each receiving section for a predetermined period of time, which will be described later. This is done by superimposing through a delay circuit.

Now, the receiving section that excites the radio wave component reflected by the reflecting surface (1a) is the first receiving section (not shown), and the receiving section that excites the radio wave component reflected by the reflecting surface (2a) is the second receiving section. Similarly, the receiving sections corresponding to the reflecting surfaces (3a) to (7a) are referred to as a third receiving section to a seventh receiving section (not shown).

Then, the radio waves received by the second receiving section are as follows.

The radio waves received by the first receiver have a certain time delay (this time is t), and the radio waves received by the third receiver are also more constant than the radio waves received by the second receiver. Similarly, the radio waves received by the seventh receiving section have a time delay of t6 relative to the radio waves received by the sixth receiving section.

For this purpose, in this example, the delay circuit delays the radio waves by a first time, and in the same manner, the radio waves received by the third to seventh receivers are also delayed by a predetermined time.

Waves with the same phase are obtained.

The reflector of the present invention as described above is a dish-shaped parabolic reflector formed into a substantially planar reflector by providing nine step portions, and because of its planar shape, it can produce a linear level. It is easy to measure and correct the overall accuracy.

Also, because it is a planar shape, the structure of the backup member is extremely simple.

There is no deformation due to processing stress, making it very convenient and low cost for mass production, transportation, and storage. Furthermore, since the cross section is stepped, the step part acts as a reinforcing rib, and
Since each annular reflecting surface and each stepped portion are integrally formed from a single plate, the structure has excellent rigidity. Furthermore, unlike a single-dish-shaped parabolic reflector, it does not contain wind, and the wind pressure can be reduced by the through hole provided in the one step part, so it is not susceptible to deformation due to wind or tremors caused by wind-induced collapse of the antenna. This is an extremely valuable invention.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a reflector, and FIG. 2 is an end view of a central longitudinal section of the reflector. B... Virtual parabolic reflector (1) to (7)... Paraboloid (1a) to (7a)... Each annular reflecting surface (8) to (13)
)...Step part (14)...Amendment for through hole procedure August 9, 1985 Patent No. 153790. -3.Relationship with the case of the person making the amendment Patent applicant (Residence) Masu 7 Rigana 4, 870 Ibaradahama-cho, Tsurumi-ku, Osaka, Agent. 5. Date of amendment order 6 Specification of the invention increased by amendment (corrected full text) 1. Title of the invention 2. Scope of claims 1) Opposite items ■''l Wang Aixing et al. Dopa m Huang. It is integrally molded with an anti-circular cover plate body, and is formed into a reflective arm divided by concentric circles from the center to the outer periphery, and the inner edge is connected to the outer edge of the reflective part adjacent to the center side of the reflective part via a step part. and a delay circuit whose outer edge is connected to the inner edge of the reflecting section adjacent to the outer circumferential side of the reflecting section via a stepped portion, and in which the inner edges of each reflecting section extend on the same plane, Delayed by each electric shock
Ti:h? The present invention relates to a reflecting device used as an antenna for sensing extremely high frequency television waves and the like. Parabolic antennas (parabolic reflectors) have conventionally been used to sense extremely short wavelength television radio waves, which have short wavelengths in the same way as light. This parabolic antenna is made of a metal plate curved into a dish shape, and has a shape that easily traps wind, so it is easily deformed by the wind. An antenna device designed to solve this problem is disclosed in Japanese Patent Laid-Open No. 46-35951. That is, a concave main reflecting mirror having a mirror axis and an opening at the apex, and a sub-reflecting mirror facing forward of the main reflecting mirror and provided on the same mirror axis, and a plurality of the main reflecting mirrors are provided. are divided into divided reflecting mirrors, and each divided reflecting mirror is formed in the shape of a step with the outer peripheral side protruding forward from the center side, and a gap is formed between each divided reflecting mirror, and the reflecting surface of the sub-reflecting mirror is connected to the main reflecting mirror. It is divided into the same number of divided reflecting surfaces corresponding to the reflecting mirrors and is shifted in the direction of the mirror axis by the same amount as each of the divided reflecting mirrors corresponding to the plurality of divided reflecting surfaces. It is something. However, in this antenna device, each reflector is divided into sections, and is formed in a step-like shape with the outer periphery shifted forward from the center side, so a complicated process is required to hold each divided reflector in the proper position. It requires a shape holding member, requires careful adjustment of one position, and requires a plurality of two-split reflecting mirrors, making mass production difficult. The reflecting device of the present invention is composed of 9 reflecting plates and a delay excitation means, 1 reflecting plate is integrally formed with a plate body, and has reflecting parts divided by concentric circles from the center to the outer periphery,
The radio waves reflected by these reflecting surfaces are directed to a focal point located at a certain location, and the inner edge is at a level difference from the outer edge of the reflecting section adjacent to the center side of the reflecting section. The outer edge is connected to the inner edge of the reflective part adjacent to the outer peripheral side of the reflective part via the stepped part, and the inner edge of each reflective part is located on the same plane. On the other hand, the delay excitation means is provided at the focal point, and includes a receiving section that excites only the radio wave components reflected by the respective reflecting surfaces, and a delay circuit that delays the output from each of these receiving sections for a predetermined period of time. Consisting of
Each delayed radio wave component is superimposed. An embodiment of the present invention will be described below with reference to the drawings. The central cross-sectional shape of a conventional parabolic antenna (parabolic reflector) is an imaginary shape shown by the chain line in Fig. 2, but the parabolic surface of this parabolic reflector B remains unchanged and the entire reflector is approximately planar. The reflector A of the present invention is formed into a plate. In other words,
In the reflector A of the present invention, the paraboloid (1) part of the conventional parabolic reflector B is used as the first annular reflecting surface (1a), and the part (2) is the first annular reflecting surface (1a). Step part (8) from the outer edge of
The part (3) is connected to the inner edge of the second annular paraboloid (2a) via the outer edge of the second annular paraboloid (2a). It is connected to the inner edge of the surface (3a), and in this way, from +1) to (
The paraboloids up to 7) are integrally formed into a substantially planar plate shape by sequentially providing step portions (8) to (13). Therefore, each of the annular reflecting surfaces (1a) to (7a) of the reflector A of the present invention has a paraboloid 1 having a surface equal to the paraboloid of the reflector B, and is arranged on the same plane. This becomes a planar reflecting plate A. Each of the annular reflecting surfaces (1a) to (7a) has been modified by the step portions (8) to (13), respectively, so the paraboloid of the parabolic reflector B in the imaginary shape shown by the chain line remains as it is. It can be integrally formed into a flat plate. A plurality of through holes (14) of appropriate size are formed at appropriate intervals in each stepped portion. In addition, in drawing 5, through holes (14) are provided in each step part from (10) to (13), but +81. (It goes without saying that similar through holes may be formed in each stepped portion of 91.For example, a cross-shaped frame (15) is placed on the back side of the circular reflector A as a backup holder.
At the center, a waveguide (16) is installed to collect the radio waves radiated and concentrated in the direction of the focal point P by a reflector A to form an antenna. - Next , a method of exciting radio waves reflected by each reflecting surface having the above configuration will be explained.The radio waves reflected by each reflecting surface are each reflected toward a predetermined location (focal point) near the focal point P. In order to align the phases of the radio waves reflected by the reflecting surfaces, a receiving section that excites only the radio wave components reflected by the respective reflecting surfaces is provided at the focal point.The output from each receiving section is delayed for a predetermined period of time to be described later. This is done by superimposing them via a delay circuit.Now, the receiving section that excites the radio wave component reflected by the reflecting surface (1a) is a first receiving section (not shown), and the radio wave component reflected by the reflecting surface (2a) is set as a first receiving section (not shown). The receiving section that excites the radio wave component is called a second receiving section (not shown).Similarly, the receiving sections corresponding to the reflecting surfaces (3a) to (7a) are called the third receiving section to the seventh receiving section (the above 1 (not shown).Then, the radio waves received by the second receiver have a certain time delay (this time is referred to as 1) than the radio waves received by the first receiver, and the radio waves received by the third receiver The radio waves received by the seventh receiver also have a certain time delay (this time is defined as t2) than the radio waves received by the second receiver.Considering the same, the radio waves received by the seventh receiver There is a time delay of time t6 from the radio waves received by the 6th receiver.For this reason, in this example, the delay circuit delays the radio waves by t6, and thereafter the radio waves received by the 3rd to 7th receivers are similarly delayed. The radio waves are also delayed by a predetermined time. Waves with the same phase can be obtained. The reflecting device of the present invention as described above forms a dish-shaped parabolic reflector into a substantially planar reflecting plate by providing a one-step difference. Because it is a flat shape, it is possible to produce a linear level, making it easy to measure and correct the overall accuracy.Also, because it is a flat shape, the structure of the backup member is extremely simple. There is no deformation, making it very convenient and low cost for mass production, transportation, and storage.Furthermore, since the cross section is stepped, the step part acts as a reinforcing rib,
Since each annular reflecting surface and each stepped portion are integrally formed from a single plate, the structure has excellent rigidity. Furthermore, unlike a two-dish parabolic reflector, it does not contain wind, and the wind pressure can be reduced by the through holes provided in the nine steps, so there is no risk of deformation due to wind or collapse of the antenna due to wind. This is an extremely valuable invention. 4. Brief Description of the Drawings The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of a reflector, and FIG. 2 is an end view of the center longitudinal section of the reflector. B... Virtual parabolic reflector (1) to (7)... Paraboloid (1a) to (7a)... Each annular reflecting surface (8) to (13)
)...Step part (14)...Through hole

Claims (1)

[Claims] 1) It is integrally molded from a plate and has reflective parts divided in concentric circles from the center to the outer periphery, and each reflective part except the center and outermost periphery has an inner edge adjacent to the center side of the reflective part. are connected to each other via the outer edge and step part,
A reflective plate characterized in that an outer edge is connected to an inner edge of a reflective part adjacent to the outer peripheral side of the reflective part via a stepped part, and the inner edges of each reflective part are located on the same plane.