JP2001320230A - Dielectric lens and its producing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mass-produce a dielectric lens thick in thickness. SOLUTION: The dielectric lens 10A for microwave band is provided with a hollow lens container 10 having uniform thickness to be functioned as a matching layer and a dielectric 6 charged and sealed in the hollow lens container to be functioned as a lens for the microwave band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric lens.
In particular, the present invention relates to a method for manufacturing a dielectric lens having an extremely large wall thickness and a dielectric lens in which the thickness near the center of the lens and the thickness on the edge side are extremely different.

[0002]

2. Description of the Related Art The above-mentioned dielectric lens is disclosed in
There is one described in JP-A-321533. When mass production of conventional dielectric lenses is inexpensive, a molding technique using a plastic resin is indispensable.

[0003]

However, the plastic molding technique has a problem in that a dielectric lens having an extremely large thickness has a dent called sink mark when the thickness near the center of the lens and the thickness on the edge side are extremely different. Also, when the resin is rapidly cooled, stress acts on the lens to cause cracks.

[0004] In addition, in order to reduce sink marks and cracks, there is another problem that after resin is injected into a molding die, it must be performed over an extremely long time. For this reason, the production of a dielectric lens by molding plastic has a problem that the lens shape, especially the thickness of the lens, is restricted. On the other hand, when a dielectric lens is combined with a horn antenna to form a lens antenna, if the thickness of the lens is small, the axial length of the lens antenna must be increased, and the volume and length of the entire antenna increase. appear.

That is, a dielectric lens having a large lens thickness is required to constitute a small lens antenna, but if mass production of dielectric lenses is inexpensive, the lens thickness must be reduced as much as possible. Problems arise. Accordingly, it is an object of the present invention to provide a dielectric lens having a large thickness and capable of mass production, and a method for manufacturing the same, in view of the above problems.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a microwave-band dielectric lens.
A dielectric lens, comprising: a hollow lens container having a uniform thickness; and a liquid dielectric filled and sealed in the hollow lens container.

[0007] By this means, mass production of a dielectric lens having a large thickness becomes possible. Preferably, the dielectric constant of the liquid dielectric is chosen to be about the square of the dielectric constant for the hollow lens container. Further, preferably, the thickness of the hollow lens container is selected to be about one-fourth in terms of the wavelength used. By this means, the hollow lens container functions as a matching layer, the reflection on the lens surface can be reduced, and the efficiency as an antenna improves.

[0008] Preferably, the hollow lens container is a first lens container.
And a second surface portion, and the first surface portion and the second surface portion each have a predetermined shape. By this means, a thick dielectric lens, a freely curved surface,
A dielectric lens having a flat surface can be realized. Preferably, the hollow lens container has an annular flange at its circular edge.

By this means, it is possible to support the dielectric lens in the opening of the horn antenna by screwing, bonding, or the like using the flange portion of the dielectric lens.
Preferably, an injection port is provided at an end of the second face portion, and the injection port having a small cross-sectional area is tapped, and after the dielectric is injected, the injection port is closed with a plug across a packing. Can come off.

[0010] By this means, the packing is sandwiched between the stopper 5 and the inlet, and the packing is made of rubber and keeps the liquid to be filled confidential, so that the dielectric does not leak. Preferably, the inlet is provided at an end of the first surface. By this means, the second surface portion becomes a disk-shaped flat plate, the injection port is eliminated, and the configuration becomes very simple.

[0011] Preferably, the inlet is provided at a central portion of the first surface portion. By this means, the injection port is turned to the top, and if a predetermined liquid is injected into the hollow lens container, the liquid can be filled without mixing an air layer or bubbles inside the hollow lens container. Preferably, the inlet is provided in a groove shape between the first surface portion and the second surface portion and in an annular flange having a circular edge.

By this means, by injecting a predetermined liquid into the hollow lens container with the injection port facing upward, the air layer or air bubbles are not mixed into the hollow lens container as described above. It becomes possible to fill the liquid. Preferably, an inlet is provided at an end of the second surface portion, the dielectric is injected through the inlet, and after plugging, the plug and the inlet are brought into close contact with a heated trowel.

This measure makes it possible to seal the inlet without the need for packing. Only a simple process is performed simply by holding down with a trowel. Preferably, a cylindrical shape formed at an edge of the inlet is melted inward with a heated trowel to close the inlet. By this means, the step of closing the inlet can be further simplified without the need for a plug for closing the inlet.

[0014] Preferably, the injection port provided in the groove in the flange is closed by pressing it from above with a heated iron. By this means, the stress when pressed by the iron is received by the flange portion, so that the stress is not applied to the dielectric lens to generate distortion, cracks or the like due to the stress.

Preferably, a trowel oscillated by an ultrasonic wave is used in place of the heated trowel. By this means,
It is possible to weld the contact surface between the inlet and the plug by frictional heat by vibrating with an ultrasonic wave without heating the iron. Preferably, the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a combination of a concave shape and a convex shape.

By this means, the electromagnetic field distribution of the lens antenna can be corrected, and the electromagnetic field distribution at the aperture of the dielectric distribution can be converted into a Taylor distribution and a Chebyshev distribution used in a low sidelobe antenna or the like. Preferably, the shape of the first surface portion is formed in a convex shape,
The shape of the second surface portion is formed in a concave shape. By this means, the incident angle of the electromagnetic wave from the lens antenna on the second surface portion is set to around 0 degree (perpendicularly incident on the dielectric lens 10A or an angle close thereto), so that the reflected wave on the surface of the second surface portion Can be suppressed to a minimum.

Preferably, the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a convex shape. By this means, reflected waves on both surfaces of the first surface portion and the second surface portion can be suppressed to a minimum. Further, the surfaces of the first surface portion and the second surface portion can be shared as completely the same component. Further preferably, the shape of the first surface portion is formed in a convex shape, the shape of the second surface portion is formed in a planar shape; the shape of the first surface portion is formed in a planar shape, and Is formed in a convex shape; the shape of the first surface portion is formed in a planar shape, and the shape of the second surface portion is formed in a combination of a concave shape and a convex shape. This is because the shape of the first and second surface portions is not limited to this shape as long as it has a shape as a lens in a microwave band as in this means. Preferably, the hollow lens container is formed of a first surface portion and a second surface portion, the first surface portion is formed in a concave shape and a planar shape, and the second surface portion is formed in a planar shape. .

Further, preferably, an inlet is provided at an end of the second surface portion. More preferably, the hollow lens container is formed of a first surface portion and a second surface portion, and the first surface portion is formed of a concave shape and a flat shape, and the second surface portion is formed of a concave shape and a flat shape. It is formed by the shape. Further, preferably, a groove-shaped inlet is provided at an end of the second surface portion or at an annular flange having a circular edge in the hollow lens container.

By these means, it becomes possible to configure the aperture of the lens antenna with a plane. Preferably, the dielectric constant of the dielectric filled in the hollow lens container is selected to be high, and the thickness of the hollow lens container near the center of the lens is reduced. By this means, the size of the dielectric lens can be reduced.

Preferably, the dielectric is formed to have a predetermined dielectric constant by mixing a liquid having a predetermined dielectric constant and a powder having a predetermined dielectric constant at a predetermined ratio. By this means, it is possible to form a dielectric having a desired dielectric constant. Preferably,
A coagulant is mixed in the dielectric liquid filled in the hollow lens container.

By this means, leakage of the dielectric is eliminated. Preferably, a lens antenna having a different focal length is formed by changing the dielectric constant of the dielectric liquid. By this means, a small lens antenna can be formed.

Further, according to the present invention, there is provided a method of manufacturing a dielectric lens in a microwave band.
A step of sandwiching two flat plates with a molding die, a step of forming a hollow lens container by evacuating air from a suction port on the molding side by a vacuum pump, and a step of filling and sealing the hollow lens container with a dielectric. The present invention provides a method for manufacturing a dielectric lens, comprising: By this means, mass production of a dielectric lens having a large thickness becomes possible. Preferably, the hollow lens container is formed by sending air from a blow port on the molding side by a compressor and applying internal pressure instead of extracting air from a vacuum pump. By this means, a dielectric lens having a large thickness can be mass-produced.

[0023]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a dielectric lens according to the present invention. As shown in this side view (a),
The hollow lens container 10 has a lens shape,
It is composed of a surface part 2.

The surface portion 1 and the surface portion 2 have a uniform thickness and each have a predetermined shape. For example, the surface portion 1 forms a convex surface having a predetermined curve, and the surface portion 2 forms a flat surface. In addition, the hollow lens container 10 is used for processing plastic or the like.
It is formed by vacuum forming or thick-hole forming technology described later.
According to this processing method, the surface portion 1 and the surface portion 2 can have a uniform thickness.

The face portion 2 has an inlet 2 having a small cross-sectional area at its end.
a. A tap is formed in the injection port 2a, and the injection port 2a is closed by the stopper 5. As shown in this side sectional view (b), the interior of the hollow lens container 10 is filled with a dielectric 6, and the dielectric 6 is a liquid having a predetermined dielectric constant, and forms a dielectric lens 10A. I do.

The liquid of the dielectric 6 has a predetermined dielectric constant (for example, a liquid used in a liquid phantom) by mixing a predetermined liquid or powder at a predetermined ratio, and is provided with an inlet 2 a of the surface portion 2. More injected. This makes it possible to form a dielectric having a desired dielectric constant. The hollow lens container 10 has an annular flange 3 at its circular edge. The flange 3 is provided to hold the dielectric lens 10A when the flange 3 is attached to an opening 7A of the lens antenna 11 described later.

The shape of the surface portions 1 and 2 forming the dielectric lens 10A is not limited to this shape as long as it has a shape as a lens in a microwave band. For example, in FIG. 1, the shape of the surface portion 1 is formed in a convex shape, and the shape of the surface portion 2 is formed in a planar shape.
May be formed in a planar shape, and the shape of the surface portion 2 may be formed in a convex shape. Further, the shape of the surface portion 1 may be formed in a planar shape, and the shape of the surface portion 2 may be formed in a combination of a concave shape and a convex shape. FIG.
FIG. 4 is an exploded view showing attachment of the plug 5 of the hollow lens container 10. FIGS. 3A and 3B are a side sectional view and a perspective view as viewed from the surface portion 2, respectively.

The plug 5 shown in the figure is made of the same material as the surface portions 1 and 2 constituting the hollow lens container 10 and has a bolt shape. The injection port 2a is closed by the stopper 5 so that the liquid filled in the hollow lens container 10 does not leak. Further, a packing 4 is sandwiched between the stopper 5 and the injection port 2a, and the packing 4 is made of rubber and keeps the liquid to be filled confidential.

FIG. 3 is a diagram showing a configuration in which the dielectric lens 10A according to the present invention is mounted on a horn antenna to form a lens antenna. As shown in FIG.
Is composed of a dielectric lens 10A and a horn 7. Although not shown in detail, the opening 7 of the horn 7 is screwed or bonded using the flange 3 portion of the dielectric lens 10A.
A supports a dielectric lens 10A.

With such a configuration, it is possible to easily realize a dielectric lens 10A having a large thickness and a dielectric lens 10A having a free surface or a flat surface. Further, the above-described structure sufficiently functions as the dielectric lens 10A in the microwave band, but the dielectric constant of the liquid of the filled dielectric 6 is a square of the dielectric constant of the hollow lens container 10 itself or a value close to the square. And the thickness of the surface portions 1 and 2 of the hollow lens container 10 is set to a quarter (λg / 4) of the used wavelength in the dielectric constant of the hollow lens container 10 or a value close thereto. By selecting, the hollow lens container 10 functions as a matching layer, it is possible to reduce the reflection on the surface of the dielectric lens 10A, and to improve the efficiency of the lens antenna 11 using the dielectric lens 10A. Will be possible.

FIG. 4 is a view showing a process of vacuum forming the hollow lens container 10. As shown in FIG.
The molding die 20 forms the surface 1 and the surface 2 of the hollow lens container 10. Two flat plates 1 heated to a predetermined temperature
A and 2A are sandwiched between the opposing molds 20.

As shown in FIG. 2B, the mold 20 is
After sandwiching the two flat plates 1A and 2A, air is evacuated from a suction port provided in the molding die 20 by a vacuum pump, and the surface portion 1 and the surface portion 2 of the hollow lens container 10 are formed. Arrows in the drawing (b) indicate the direction in which air flows. In this embodiment, it has been described that the two flat plates 1A and 2A are processed into the hollow lens container 10 by the vacuum forming technique. However, air is sent into the hollow lens container 10 at the time of forming by the thick-hollow forming technique. By applying internal pressure, it is also possible to increase the adhesion of the resin to the mold and to perform molding with high precision.

At this time, the suction port provided in the molding die 20 is used as an injection port to feed air by a compressor at the time of forming thick air. Next, the operation in the case of transmission as the lens antenna 11 in FIG. 3 will be described.
The arrows in FIG. 3 indicate the path and direction in which the microwave propagates. The microwave inputted from the input side opening 7B of the lens antenna 11 (the side opposite to the opening 7A of the dielectric lens) goes toward the opening 7A of the horn portion 7 on the side of the dielectric lens 10A.

At this time, the wavefront (surface having the same phase) of the microwave is substantially spherical. The microwave enters a surface of the dielectric lens 10A on the horn portion 7 side (described as the surface portion 2 in the configuration of the embodiment), and is refracted at a predetermined refractive index (the refractive index is a square root of the dielectric constant). The light passes through the inside of the body lens 10A, enters the surface of the dielectric lens 10A on the side opposite to the horn 7, and is refracted at a predetermined refractive index and emitted.

At this time, the microwave is transmitted to the lens antenna 11
, And becomes a substantially plane wave (wavefront is substantially flat). The above is the operation in the case where microwaves are radiated from the lens antenna 11. In the case of reception, the microwaves incident on the lens antenna 11 follow the reverse path, and the dielectric lens of the lens antenna 11 It is converged on the opening 7B on the opposite side to 10A.

Although the above description has been made with reference to the embodiment of FIG. 3, the same description can be applied to other examples of the present antenna described later. FIG. 5 is a view showing a modification of the injection port for the hollow lens container 10 in FIG. As shown in this figure, compared to FIG.
Position is different.

As shown in FIG. 2A, an injection port 2b is provided at an end of the surface 1 of the hollow lens container 10. As a result, the surface portion 2 becomes a disk-shaped flat plate, and the injection port 2a is eliminated, resulting in a very simple configuration. As shown in FIG. 2B, an injection port 2c is provided at the center of the surface 1 of the hollow lens container 10. This allows
The injection port 2c faces the sky, and the hollow lens container 1
If a predetermined liquid is injected into the hollow lens container 10,
It is possible to fill the liquid without mixing an air layer or bubbles therein.

FIG. 6 shows the hollow lens container 10 shown in FIG.
It is a figure which shows the other modification of the injection port regarding. As shown in this figure, the position of the injection port 2d of the dielectric 6 is different from that of FIG. The groove is formed at the same time when the face 1 is formed.
An injection port 2 d is provided between the surface portion 2. By injecting a predetermined liquid into the hollow lens container 10 with the inlet 2d facing the top, the liquid is filled without mixing an air layer or air bubbles into the hollow lens container 10 as described above. It becomes possible.

FIG. 7 shows the hollow lens container 10 shown in FIG.
FIG. 7 is a diagram showing an example of closing an injection port 2a. As shown in this figure (a), the plug 5 is welded to the injection port 2a of the surface portion 2 and then the injection port 2a is welded by the heated iron 8. According to this, the injection port 2a can be sealed without requiring packing.

Further, only a simple process of holding down by the iron 8 is required. Further, it is possible to weld the contact surface between the injection port 2a and the plug 5 by frictional heat by vibrating with an ultrasonic wave without heating with the iron 8. As shown in FIG. 2B, if the edge of the injection port 2a is previously formed into a cylindrical shape at the same time when the surface portion 2 is formed, the cylindrical portion melts inward when the trowel 8 is applied. It becomes possible to close the inlet 2a.

According to this, the step of closing the injection port 2a can be further simplified without the need for the plug 5 for closing the injection port 2a. FIG. 8 is a partial side view showing an example of closing the injection port 2d of the hollow lens container 10 in FIG. As shown in the figure (a), the injection port 2d protruding from the flange 3 is connected to the injection port 2d as shown in the figure (b).
The heated iron 8 or the iron 8 vibrated by ultrasonic waves is pressed down from above and closed.

According to this, since the stress when pressed by the trowel 8 is received by the flange 3, the stress is not applied to the dielectric lens 10 A to generate a distortion, a crack or the like due to the stress. Become. In addition,
By mixing a coagulant into the liquid of the dielectric 6 to be filled in the hollow lens container 10, it becomes possible to prevent the liquid from leaking from the hollow lens container 10 or to make the liquid hard to leak.

FIG. 9 is a sectional view showing a modified example of the surface portion 1 and the surface portion 2 in the hollow lens container 10 of FIG. As shown in FIG. 1A, the surface 1 of the hollow lens container 10 is formed as a convex surface, and the surface 2 is formed as a combination of a concave surface and a convex surface. According to this, the electromagnetic field distribution of the lens antenna 11 can be corrected, and the electromagnetic field distribution at the aperture of the dielectric distribution can be converted into a Taylor distribution and a Chebyshev distribution used in a low sidelobe antenna or the like.

As shown in FIG. 4B, the surface 1 is formed as a convex surface, and the surface 2 is formed as a concave surface. According to this,
Since the incident angle of the electromagnetic wave from the lens antenna 11 on the surface portion 2 is close to 0 degree (perpendicularly incident on the dielectric lens 10A or an angle close thereto), the reflected wave on the surface of the surface portion 2 is suppressed to the minimum. can do.

As shown in FIG. 4C, the surface portion 1 and the surface portion 2
Are formed on the convex surface. According to this, it is possible to suppress the reflected waves on both surfaces 1 and 2 to a minimum. Further, the surfaces of the surface portion 1 and the surface portion 2 can be shared as completely the same component. FIG. 10 is a sectional view showing another modified example of the hollow lens container 10 in FIG.

As shown in FIG. 2A, the surface 1 is formed into a plane 1B and a concave surface 1C, and the surface 2 is formed into a plane. The inlet 2 a is provided on the surface 2. According to this,
The aperture of the lens antenna 11 can be formed by a plane. As shown in this figure (b), as compared to this figure (a), a groove inlet 2d is provided between the surface part 1 and the surface part 2.

As shown in FIG. 3C, the surface 1 is formed on a plane 1B and a concave surface 1C, and the surface 2 is formed on a plane 2B and a concave surface 2C. A groove injection port 2 d is provided between the surface portion 1 and the surface portion 2. FIG. 11 is a sectional view showing another modification of the hollow lens container 10 in FIG.

As shown in FIG. 4A, the surface 1 is formed by combining a convex surface 1D and a plane 1E on the outside, a concave surface 1F and a plane 1G on the inside, and the surface 2 is formed by a flat plate. The inlet 2 a is formed at an end of the surface 2. According to this, by selecting a high dielectric constant of the liquid filled in the hollow lens container 10, it becomes possible to reduce the thickness near the center of the dielectric lens 10A, and to reduce the size of the dielectric lens. Will be possible.

As shown in FIG. 4B, the surface 1 is formed by combining a convex surface 1D and a plane 1E on the outside and a plane 1G on the inside, and the surface 2 is formed by a concave surface 2D and a plane 2E on the inside and a plane 2F on the outside. It is formed by a combination. Inlet 2a
Is formed at the center of the surface 2. Thus, FIG. 2B shows a configuration in which the internal shape of the hollow lens container 10 is reversed from the combination of the flat surface and the curved surface in FIG. The configuration of FIG. 11B has the same operation and effect as the configuration of FIG.

FIG. 12 shows a lens antenna 11 having a small axial length.
FIG. 13 is a cross-sectional view showing the lens antenna 11 having a large axial length. The chain line in the figure shows the horn antenna before the axial length is shortened or lengthened. According to this, when a lens antenna 11 having a high gain is required, as shown in FIG. 13, the dielectric constant of the liquid is reduced and the axial length of the horn is increased.

When a small lens antenna 11 having a small axial length is required, the dielectric constant of the liquid is increased and the axial length of the horn is reduced as shown in FIG. As described above, it is possible to select a horn antenna having an axial length that matches desired antenna characteristics using the same hollow lens container 10.

[0052]

As described above, according to the present invention,
A hollow lens container having a uniform thickness and functioning as a matching layer is filled with a dielectric and sealed to form a microwave band lens, so a thick dielectric lens can be formed and a lens with a small axial length It became possible to provide an antenna.

Further, the curved surface of the lens can be freely selected, and a lens having an uneven thickness can be formed by using a vacuum forming technique or the like. Compared with the conventional dielectric lens, it has become possible to manufacture the lens shape (lens curved surface) more accurately. Further, it is possible to provide an inexpensive dielectric lens which is excellent in mass productivity, can utilize a vacuum molding technique and the like, has a small number of parts, and is easy to manufacture.

The axial length of the lens antenna can be increased or decreased by changing the dielectric constant of the dielectric liquid.

[Brief description of the drawings]

FIG. 1 is a view showing a dielectric lens according to the present invention.

FIG. 2 is an exploded view showing attachment of the stopper 5 of the hollow lens container 10.

FIG. 3 is a diagram showing a configuration in which a dielectric lens 10A according to the present invention is mounted on a horn antenna to form a lens antenna.

FIG. 4 is a diagram showing a process of vacuum forming the hollow lens container 10.

FIG. 5 is a view showing a modified example of an inlet for the hollow lens container 10 in FIG. 1;

FIG. 6 is a view showing another modification of the injection port for the hollow lens container 10 in FIG. 1;

7 is a diagram illustrating an example of closing an injection port 2a of the hollow lens container 10 in FIG.

8 is a partial side view showing an example of closing the injection port 2d relating to the hollow lens container 10 in FIG.

FIG. 9 shows a surface portion 1 of the hollow lens container 10 of FIG.
It is sectional drawing which shows the modification of the surface part 2.

FIG. 10 is a cross-sectional view showing another modification of the hollow lens container 10 in FIG.

11 is a cross-sectional view showing another modification of the hollow lens container 10 in FIG.

FIG. 12 is a sectional view showing a lens antenna 11 having a small axial length.

FIG. 13 is a sectional view showing a lens antenna 11 having a large axial length.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st surface part 1A, 2A ... Flat plate 1B, 1E, 1G, 2B, 2E, 2F ... Plane 1C, 1F, 2C, 2D ... Concave surface 1D ... Convex surface 2 ... 2nd surface part 2a, 2b, 2c, 2d ... Inlet 3 ... Flange 4 ... Packing 5 ... Plug 6 ... Dielectric 7 ... Horn 7A, 7B ... Opening 8 ... Trowel 10 ... Hollow lens container 10A ... Dielectric lens 11 ... Lens antenna 20 ... Mold

Claims (29)

[Claims] 1. A dielectric lens in a microwave band, comprising: a hollow lens container having a uniform thickness; and a liquid dielectric filled and sealed in the hollow lens container. Body lens. 2. The dielectric lens according to claim 1, wherein the dielectric constant of the liquid dielectric is selected to be approximately a square of the dielectric constant of the hollow lens container. 3. The method according to claim 1, wherein the thickness of the hollow lens container is selected to be about one-fourth of the wavelength used.
The dielectric lens according to claim 1. 4. The method according to claim 1, wherein the hollow lens container is formed of a first surface portion and a second surface portion, and the first surface portion and the second surface portion each have a predetermined shape. The dielectric lens according to any one of claims 1 to 3. 5. The dielectric lens according to claim 4, wherein the hollow lens container has an annular flange at a circular edge thereof. 6. An injection port is provided at an end of said second surface portion, and is tapped into said injection port 2a having a small cross-sectional area. After the dielectric material is injected, said injection port is inserted with a plug with a packing therebetween. The dielectric lens according to claim 4, wherein the entrance is closed. 7. The dielectric lens according to claim 6, wherein the inlet is provided at an end of the first surface. 8. The dielectric lens according to claim 6, wherein the inlet is provided at a center of the first surface. 9. The method according to claim 9, wherein the inlet is the first surface portion, and the second surface portion is the second surface portion.
The dielectric lens according to claim 6, wherein the dielectric lens is provided in a groove shape between the surface portions and on the annular flange of the circular edge. 10. An inlet is provided at an end of the second surface portion, the dielectric is injected through the inlet, and after plugging, the plug is welded to the inlet with a heated trowel. The dielectric lens according to claim 4, wherein: 11. The dielectric lens according to claim 10, wherein a cylindrical shape formed at an edge of the inlet is melted inward with a heated trowel to close the inlet. 12. The dielectric lens according to claim 9, wherein the injection port provided in the groove in the flange is closed by pressing the injection port with a heated iron from above. 13. The method according to claim 1, wherein an ultrasonic vibrator is used instead of the heated iron.
The dielectric lens according to any one of claims 0 to 12. 14. The method according to claim 4, wherein the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a combination of a concave shape and a convex shape. Dielectric lens. 15. The dielectric lens according to claim 4, wherein the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a concave shape. 16. The dielectric lens according to claim 4, wherein the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a convex shape. 17. The dielectric lens according to claim 4, wherein the shape of the first surface portion is formed in a convex shape, and the shape of the second surface portion is formed in a planar shape. 18. The dielectric lens according to claim 4, wherein the shape of the first surface portion is formed in a planar shape, and the shape of the second surface portion is formed in a convex shape. 19. The method according to claim 4, wherein the shape of the first surface portion is formed in a planar shape, and the shape of the second surface portion is formed in a combination of a concave shape and a convex shape. Dielectric lens. 20. The hollow lens container has a first surface and a second surface, the first surface has a concave shape and a planar shape, and the second surface has a planar shape. The dielectric lens according to claim 1, wherein the dielectric lens is formed. 21. The dielectric lens according to claim 20, wherein an inlet is provided at an end of the second surface. 22. The hollow lens container is formed of a first surface portion and a second surface portion, wherein the first surface portion is formed by a concave shape and a flat shape, and wherein the second surface portion is formed by a concave shape and a flat shape. 2. The structure according to claim 1, wherein the shape is formed by a shape.
2. The dielectric lens according to claim 1. 23. The groove-shaped inlet is provided at an end of the second surface portion or at an annular flange having a circular edge in the hollow lens container. 2. The dielectric lens according to claim 1. 24. The method according to claim 1, wherein the dielectric constant of the dielectric material filled in the hollow lens container is selected to be high, and the thickness of the hollow lens container near the center of the lens is reduced. Dielectric lens. 25. A liquid having a predetermined dielectric constant, wherein:
The dielectric lens according to claim 1, wherein a powder having a predetermined dielectric constant is mixed at a predetermined ratio to form a predetermined dielectric constant. 26. The dielectric lens according to claim 1, wherein a coagulant is mixed into a dielectric liquid filled in the hollow lens container. 27. The dielectric lens according to claim 1, wherein lens dielectrics having different focal lengths are formed by changing a dielectric constant of the dielectric liquid. 28. A method for manufacturing a dielectric lens in a microwave band, comprising: a step of sandwiching two flat plates heated to a predetermined temperature with a molding die;
A method for manufacturing a dielectric lens, comprising: a step of forming a hollow lens container; and a step of filling and sealing a dielectric in the hollow lens container. 29. The method according to claim 28, wherein the hollow lens container is formed by sending air from a blowing port on the molding side by a compressor and applying internal pressure instead of extracting air from a vacuum pump. A method for manufacturing the dielectric lens according to the above.