JP2003252136A - Method of manufacturing radio wave transmission cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a radio wave transmission cover that can be molded with less dies and manufactured at reduced man-hours. <P>SOLUTION: The method of manufacturing the radio wave transmission cover comprises a first process of molding a cover substrate having a projecting part having a shape corresponding to a shape of a fin part, a second process of forming a dummy fin part by forming a metal film on the surface of the projecting part, and a third process of potting transparent resin on the surface having the dummy fin part of the cover substrate. The manufacturing method of the radio wave transmission cover comprises a first process of molding the cover substrate having a recessed part with a shape complementary to the shape of the fin part, a second process of forming a dummy fin part by forming a metal film on the surface of the recessed part, and a third process of potting transparent resin on the surface having the dummy fin part of the cover substrate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave transmission cover provided on a vehicle front grill used in a vehicle equipped with a radio wave transmission / reception device.

[0002]

2. Description of the Related Art An auto cruise system measures a vehicle-to-vehicle distance and a relative speed between a vehicle in front and a vehicle by a sensor mounted in front of the vehicle, and controls a throttle and a brake based on this information to control the vehicle. Is a technology that controls the distance between vehicles by accelerating and decelerating. In recent years, the auto cruise system has been attracting attention as one of the core technologies of an intelligent transportation system (ITS) aiming at alleviating traffic congestion and reducing accidents.

As a sensor used in the auto cruise system, a radio wave transmitter / receiver such as a millimeter wave radar is generally used.

The radio wave transmitting / receiving device is generally arranged on the back side of the front grill of the vehicle. However, since the front grill is often metal-plated, it is difficult to satisfactorily transmit radio waves through highly conductive metal. In addition, the front grill has a structure with a vent hole for taking in air, and it does not have a uniform thickness, so if you let radio waves go in and out through such a front grill, the thickness of the front grill will be There is a difference in the radio wave transmission speed between the thin portion and the thick portion, making it difficult to obtain good radar sensitivity.

Under these circumstances, it is common to provide a window portion through which radio waves can be transmitted in the portion of the front grill corresponding to the portion in which the radio wave transmitting / receiving device is arranged. When a window is provided on the front grill, it is possible to let radio waves go in and out through this window. However, the appearance of the front grill loses continuity due to the provision of the window portion, and since the inside of the vehicle, such as the radio wave transmitting / receiving device and the engine room, is seen through the window portion, the appearance of the vehicle is impaired. There is a risk that

Therefore, conventionally, for example, Japanese Unexamined Patent Publication No. 2000-15 has been used.
A radio wave transmission cover as disclosed in Japanese Patent No. 9039 or Japanese Patent Laid-Open No. 2000-344032 is inserted into a window portion of a front grill so that the window portion and the front grill main body have a sense of unity. Japanese Patent Laid-Open No. 2000-15903
The radio wave transmission cover disclosed in Japanese Laid-Open Patent Publication No. 9-34340 and Japanese Patent Laid-Open Publication No. 2000-344032 is formed by laminating a plurality of resin layers having irregularities. In this radio wave transmission cover, the metal layer deposited with unevenness between the resin layers can give the impression that the fin members of the front grill are continuously present in the radio wave transmission cover.

However, in such a radio wave transmission cover, a transparent resin layer for protecting the metal layer must be laminated on the metal layer. Therefore, the structure of the radio wave transmission cover has a structure in which a plurality of resin layers and a metal layer deposited between the resin layers are laminated. Therefore, various types of molding dies are required to manufacture such a radio wave transmission cover, and there is a problem that the number of manufacturing steps increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above circumstances, and is for a radio wave transmission cover that can be molded with a small number of molds and can be manufactured with a small number of steps. It is intended to provide a manufacturing method.

[0009]

A method of manufacturing a radio wave transmission cover according to a first aspect of the present invention for solving the above-mentioned problems is provided in a front grill of a vehicle having a grid-shaped fin portion,
A method of manufacturing a radio wave transmission cover in which a radio wave transmitting / receiving device is arranged on the back side, the first step of molding a cover base material having a convex portion having a shape corresponding to the shape of the fin portion, and the step of forming the convex portion. It has a second step of forming a metal thin film on the surface to form a pseudo fin portion, and a third step of potting a transparent resin on the surface of the cover base material on which the pseudo fin portion is formed. Is characterized by.

The method of manufacturing a radio wave transmission cover according to a second aspect of the present invention is a radio wave transmission cover which is disposed on a front grill of a vehicle having a grid-shaped fin portion and a radio wave transmitting / receiving device is disposed on a rear side thereof. A first step of molding a cover base material having a recess having a shape complementary to the shape of the fin portion with a transparent resin, and forming a metal thin film on the surface of the recess to form a pseudo fin. And a third step of forming a resin on the surface of the cover base material on which the pseudo fin portion is formed by a potting process.

According to the first and second aspects of the present invention, a transparent resin or a resin is potted on the surface of the cover base material on which the pseudo fin portions are formed, so that various types of molding dies are required. It is possible to form a radio wave transmission cover having a laminated structure without doing so.

The method of manufacturing the radio wave transmission cover according to the first aspect of the invention and the method of manufacturing the radio wave transmission cover according to the second aspect of the present invention include the above-mentioned pseudo portion of the surface of the cover substrate on which the pseudo fin portion is formed. It is preferable to include a fourth step of coating the portion excluding the fin portion with black.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The radio wave transmission cover manufactured by the manufacturing method of the present invention transmits electromagnetic waves such as millimeter waves, submillimeter waves and microwaves.

The method of manufacturing a radio wave transmission cover according to the first aspect of the present invention comprises a first step of forming a cover base material having a convex portion having a shape corresponding to the shape of the fin portion of the front grill, and the convex portion. A second step of forming a metal thin film on the surface of the cover to form a pseudo fin portion, and a third step of forming a transparent resin by potting on the surface of the cover substrate on which the pseudo fin portion is formed.
And the steps of.

In the first step of the first invention, the cover base material is formed into a shape having a convex portion corresponding to the shape of the fin portion of the front grill. Such a cover substrate is
It can be formed using a known resin material such as BS resin and AES resin by a known molding method such as injection molding.

In the second step of the first invention, a metal thin film is formed on the surface of the convex portion of the cover base material formed in the first step. Since the metal thin film is formed on the surface of the convex portion of the cover base material to form the pseudo fin portion, the radio wave transmission cover according to the first aspect of the present invention has an integral shape with the shape of the fin portion of the front grill. To be seen. The metal thin film can be formed by a known means such as vapor deposition, printing, plating using a commonly used known metal or alloy,
It can also be formed using a non-metallic paint having metallic luster. This metal thin film is preferably formed in the same or similar color as the metal color of the fin portion. Further, the metal thin film is preferably formed to have a constant film thickness, more preferably 350 μm or less. Further, it is more preferable that this metal thin film is formed by vapor deposition of iridium or is etched after forming the metal thin film.

In the third step of the first invention, a transparent resin is potted on the surface of the cover substrate on which the metal thin film is formed and the pseudo fin portion is formed in the second step. By using the resin layer obtained by potting the upper layer of the metal thin film, a resin layer having a flat surface can be easily formed, and a radio wave transmission cover having a uniform thickness can be easily formed. In this case, since the resin layer formed by potting has a uniform thickness in the direction of gravity, it is necessary to carry out potting after the cover base material forming this resin layer is installed horizontally. Here, since the radio wave transmission cover manufactured by the method of the first aspect of the present invention is disposed on the front grill with the surface on which the transparent resin is potted formed as the surface layer, the pseudo fin portion is visible from the front of the vehicle through the transparent resin. It Therefore, since it is required that the transparent resin does not interfere with the design of the pseudo fin portion, the transparency of the transparent resin is preferably high. Further, since this transparent resin is located on the outermost surface of the radio wave transmission cover and exposed to the outside air, it is preferably formed of a material having high weather resistance. Therefore, as the transparent resin used in the production method of the present invention, polyurethane, unsaturated polyester, etc., which have high transparency and weather resistance, are preferable, and other epoxy resins can also be used.

The transparent resin can be directly formed on the cover substrate by potting, or can be formed by potting on a single-sided or frame-shaped potting die having a desired potting shape. When using a potting mold, the potting mold is placed with the opening facing upwards, and the cover substrate is fixed in this mold so that the surface on which potting is performed faces upwards. It is preferable that the potting is performed by injecting a transparent resin into the opening. When a potting die is used, the transparent resin is prevented from flowing out to a portion other than the die, so that the molding can be performed more preferably.

A method of manufacturing a radio wave transmission cover according to a second aspect of the present invention comprises a first step of molding a cover base material having a recess having a shape complementary to the shape of the fin portion of the front grill with a transparent resin. A second step of forming a metal thin film on the surface of the concave portion to form a pseudo fin portion, and a third step of potting a resin on the surface of the cover base material on which the pseudo fin portion is formed, In the first step of the second aspect of the invention, the cover base material is formed into a shape having a concave portion having a shape complementary to the shape of the fin portion of the front grill. Here, the radio wave transmission cover manufactured by the method of the second aspect of the present invention is arranged on the front grill with a cover base material formed by molding a transparent resin as a surface layer.
Therefore, the transparent resin forming the cover base material is preferably a resin material having high weather resistance and high transparency, such as polycarbonate and acrylic. The transparent resin can be formed by a known molding method such as injection molding.

In the second step of the second invention, a metal thin film is formed on the surface of the recess of the cover substrate formed in the first step. As described above, the radio wave transmission cover manufactured by the manufacturing method of the second aspect of the present invention is disposed on the front grill with the cover base material as the surface layer. Therefore, the metal thin film formed in the concave portion of the cover base material formed of the transparent resin is visible from the front of the vehicle through the cover base material. In the second step, the metal thin film is formed on the surface of the concave portion of the cover base material to form the pseudo fin portion, so that the radio wave transmission cover according to the second aspect of the present invention is integrated with the shape of the fin portion of the front grill. It is visually recognized as having a unique shape. Similar to the first invention, the metal thin film can be formed by a known means such as vapor deposition or printing using a commonly used known metal or alloy, or a non-metallic paint having metallic luster can be used. Can also be formed. This metal thin film is preferably formed in the same or similar color as the metal color of the fin portion. Further, the metal thin film is preferably formed to have a constant film thickness, more preferably 350 μm or less.

In the third step of the second invention, a resin is potted on the surface of the cover substrate on which the metal thin film is formed and the pseudo fin portion is formed in the second step. Here, in the radio wave transmission cover manufactured by the method according to the second aspect of the present invention, the surface on which the resin is potted is disposed as the back layer on the front grille, so the resin material used here is transparent. There is no need, and known resin materials such as polyurethane, unsaturated polyester and epoxy resin can be used. Here, potting can be carried out by potting as it is on the cover base material as in the third step of the first invention, or a single-sided frame having a desired potting shape or a frame-shaped mold is used. It is also possible to fix the lower surface of the cover base material to a mold, and form the transparent resin by potting on it.

According to the first and second aspects of the present invention, a transparent resin or a resin is potted on the surface of the cover base material on which the pseudo fin portion is formed, so that various types of molding dies are required. It is possible to form a radio wave transmission cover having a laminated structure without doing so. Generally, the cost required for the mold is high among the costs required for manufacturing, and especially in the case of small-volume production, the cost required for the mold is higher than other costs. However, according to the method of manufacturing the radio wave transmission cover of the present invention, it is possible to reduce the number of molds, and therefore the manufacturing cost can be reduced especially in the case of small-volume production. That is, according to the conventional method, each layer of the radio wave transmission cover is molded using a mold, and then the obtained layers are laminated to form a radio wave transmission cover having a multilayer structure. On the other hand, according to the method of manufacturing the radio wave transmission cover of the first invention and the second invention of the present invention, the resin is potted on the upper layer of the cover base material obtained in the first step, so that the radio wave transmission of the multi-layer structure is performed. A cover is formed. In the present invention, the mold required for potting molding may be only one side or a frame-shaped mold as described above, so that the number of molds required for manufacturing the radio wave transmission cover having a laminated structure can be reduced. Becomes

By forming a transparent resin or a resin by potting on the cover base material, it is easy to form the radio wave transmission cover having a laminated structure with a constant thickness. Here, it is preferable that the thickness of the radio wave transmission cover is constant in the direction perpendicular to the radio wave transmission path. This is because the radio wave transmission cover allows radio waves to enter and exit, and therefore, when there is a thin portion and a thick portion, a difference occurs in the radio wave transmission speed, and it becomes difficult to obtain good radar sensitivity.

When the conventional method of forming each layer of the laminated structure with a mold and then laminating and integrating the layers is used, it is very difficult to form each layer with high precision and to laminate with high precision. Therefore, a shaping process for making the wall thickness constant after stacking is required. However, according to the method of manufacturing a radio wave transmission cover of the present invention, the resin or transparent resin layer formed on the cover base material is formed by potting. Therefore, the step of laminating each layer is unnecessary, and even if there is some error in the thickness of the cover base material,
Since the resin layer is formed so as to fill the difference in wall thickness, it becomes possible to easily manufacture the radio wave transmission cover having a constant wall thickness.

Here, the potting-formed resin or transparent resin layer may have a slight difference in thickness between the central portion and the end portion. However, the radio wave transmission cover can be favorably used if the thickness on the transmission path through which radio waves are transmitted is constant. Therefore, the difference in wall thickness generated in the resin or transparent resin layer of the present invention is of a level that can be used.

The radio wave transmission cover manufacturing method according to the first aspect of the invention and the radio wave transmission cover production method according to the second aspect of the invention include: The fourth part, which is painted black except the fin part
It is preferable to include the step of. By painting the portion excluding the pseudo fin portion with black in the fourth step, it is visually recognized as if the portion excluding the pseudo fin portion does not exist, so that the sense of unity between the radio wave transmission cover and the front grill is further enhanced. Can be higher. This black paint can be applied by a known method using a known black paint containing a pigment such as carbon black.

[0027]

Embodiments of the present invention will be described below with reference to the accompanying drawings. (Embodiment 1) This embodiment 1 is based on a method of manufacturing a radio wave transmission cover according to the first invention. FIG. 1 is a state diagram showing a state in which a radio wave transmission cover manufactured by the manufacturing method of the first embodiment is arranged on a front grill of an automobile, and an enlarged view of essential parts of the front grille and the radio wave transmission cover of FIG. 1 is shown. 2 shows. 3 is a perspective view of the radio wave transmission cover manufactured by the manufacturing method of the first embodiment, and FIG. 4 is a sectional view of the radio wave transmission cover of FIG. 3 taken along the line AA ′.

The radio wave transmission cover 1 manufactured by the method of manufacturing the radio wave transmission cover of the first embodiment is arranged on a part of the front grill 2 located in front of the vehicle. When the radio wave transmission cover 1 is viewed from the front side of the vehicle, the front grill 2
The radio wave transmission cover 1 and the radio wave transmission cover 1 give the impression of having a continuous shape.

A window portion 4 is formed in the front grill 2 by cutting out a grid-shaped fin portion 3 at a predetermined position. From the fin portions 3 located at the left and right side ends of the window portion 4 to the window portion 4
An eaves portion 5 (not shown) projects in the direction.

The radio wave transmission covers 1 are respectively provided at predetermined positions on the end faces which are the upper end and the lower end when they are arranged in the window 4.
A total of four screwing leg portions 6 are formed one by one, and a screwing hole portion 7 is formed in the central portion of the screwing leg portion 6. Further, long fitting legs 8 are formed at positions complementary to the eaves 5 toward the vehicle interior side on end surfaces that are the right end portion and the left end portion when arranged in the window portion 4. There is.

When the radio wave transmission cover 1 is inserted into the window portion 4 of the front grille 2, the eaves portion 5 of the front grille 2 and the fitting leg portion 8 of the radio wave transmission cover 1 are fitted and fixed. Then, the screw hole 7 of the radio wave transmission cover 1 and the screw hole 9 of the front grill (not shown) are joined by screws.

The method of manufacturing the radio wave transmission cover 1 of the first embodiment is performed in the following steps.

<First Step> In the first embodiment, the first
This step is a step of molding the cover base material 10 having a convex portion having a shape corresponding to the shape of the fin portion 3 of the front grill 2. In Example 1, the first step was performed by injection molding using AES resin as a raw material. The cover substrate 10 was obtained by introducing the AES resin into an injection molding machine, injection-molding the molten AES resin in a molding die, and cooling and solidifying. In the above-mentioned process, the cover base material 10 has a total of four screwing leg portions 6 directed to the vehicle interior side from two predetermined positions on each of the upper and lower ends of the flat plate-shaped base material body 11 having a thickness of 2.5 mm. A total of 16 elongated fitting legs 8 extending from the left and right ends of the base material body 11 in a position complementary to the eaves 5 of the front grille 2 toward the vehicle compartment. Formed in. In addition, on the surface of the base material main body 11 that is the surface layer side when arranged on the front grill, convex portions 12 having a shape corresponding to the shape of the fin portion 3 of the front grill 2 are formed vertically and horizontally in a grid pattern. A frame portion 14 having a constant height was formed on the outer edge portion of the surface of the base material body 11 on which the convex portion 12 was formed.

<Second Step> In the first embodiment, the second step
The step is a step of forming the metal thin film 13 on the surface of the convex portion 12 formed in the first step to form the pseudo fin portion 15. In the first embodiment, the metal thin film 13 is made of iridium as a metal material and has a film thickness of 35 on the protrusion 12 of the base body 11.
It was formed by vapor deposition to 0 μm. At the time of vapor deposition, a masking process was applied to the portion of the base material body 11 excluding the protrusions 12, and therefore the metal thin film 13 was formed only on the protrusions 12.

<Third Step> In the first embodiment, the third step
In the step of, the transparent resin is potted on the surface of the cover substrate 10 on which the pseudo fin portion 15 is formed, and the transparent resin layer 16 is formed.
Is a step of forming. In Example 1, a urethane resin was used as the transparent resin. A potting mold (not shown) was arranged such that the opening was on the upper surface, and the cover substrate 10 having the pseudo fins 15 formed therein was fixed in the mold in the first step and the second step. Here, the cover base material 10 was fixed inside the potting mold so that the pseudo fin portion 15 faced upward. By injecting the urethane resin that has been melted in advance into the opening of the potting mold to which the cover base material 10 is fixed, the urethane resin that is a transparent resin is applied to the surface of the cover base material 10 on which the pseudo fin portion 15 is formed. It was formed by potting with a constant wall thickness. Also,
Since the frame portion 14 is formed on the outer edge portion of the cover body 11, the urethane resin is potted inside the frame portion 14.

<Fourth Process> In the first embodiment, the fourth process
The step is a step of forming a black coating layer 17 by black-painting a portion of the surface of the cover base material 10 on which the pseudo fin portion 15 is formed, on a portion where the pseudo fin portion 15 is not formed.
In this Example 1, black coating was performed by coating with a coating material containing carbon black. Using the paint containing this carbon black, the pseudo fin portion 1
By coating the cover base material 10 with 5 masked, a black coating layer 17 was formed on a portion of the surface of the cover base material 10 on which the pseudo fin portions 15 were formed, excluding the pseudo fin portions 15.

(Embodiment 2) This embodiment 2 is based on a method of manufacturing a radio wave transmission cover according to the second invention. FIG. 5 shows a perspective view of the radio wave transmission cover manufactured by the manufacturing method of the second embodiment, and FIG. 6 shows a sectional view of the radio wave transmission cover of FIG. 5 taken along the line BB ′. The radio wave transmission cover 18 manufactured by the method of the second embodiment is similar to the radio wave transmission cover 1 manufactured by the method of the first embodiment in that the screw legs 19 and the screw holes 20 are provided.
And the fitting leg portion 21 is formed.

The method of manufacturing the radio wave transmission cover 18 of the second embodiment is performed in the following steps.

<First Step> In the second embodiment, the first
This step is a step of forming the cover base material 22 having a concave portion having a shape complementary to the shape of the fin portion of the front grill.
In Example 2, the first step was performed by injection molding using a polycarbonate resin as a raw material. The cover base material 22 was obtained by charging a polycarbonate resin into an injection molding machine, injection-molding the molten polycarbonate resin in a molding die, and cooling and solidifying. In the above-described process, the cover base material 22 has a total of four screwed leg portions 19 directed toward the vehicle interior side from two predetermined positions on each of the upper and lower end sides of the flat plate-shaped base material body 23 having a thickness of 2.5 mm. A total of 16 elongated fitting legs 21 extending from the left and right ends of the base material body 23 in a position complementary to the eaves of the front grill (not shown) toward the passenger compartment. Formed in. Further, in the surface of the base material body 23, which is the back layer side when it is arranged on the front grill, concave portions 24 having a shape complementary to the shape of the fin portion of the front grill (not shown) are formed in a grid pattern vertically and horizontally. Was done.

<Second Step> In the second embodiment, the second step
The step is a step of forming the metal thin film 25 on the surface of the recess 24 formed in the first step to form the pseudo fin portion 26. In the second embodiment, the metal thin film 25 is made of iridium as a metal material and has a film thickness 35 in the recess 24 of the base body 23.
It was formed by vapor deposition to 0 μm. At the time of vapor deposition, a masking process was performed on the portion of the base material body 23 excluding the recess 24, so that the metal thin film 25 was formed only in the recess 24.

<Third Step> In the second embodiment, the third step
This step is a step of forming a resin layer 27 by potting a resin on the surface of the cover base material 22 on which the pseudo fin portion 26 is formed. The third step of Example 2 was performed in the same manner as the third step of Example 1 except that a polyurethane resin was used as the resin and the inside of the recess 24 was potted.

<Fourth Process> In the second embodiment, the fourth process
The step is a step of forming a black coating layer 28 by black-coating a portion of the surface of the cover base material 22 on which the pseudo fin portion 26 is formed, excluding the pseudo fin portion 26. Fourth of the first embodiment
The step of was performed in the same manner as the fourth step of Example 1.

As described above, according to the manufacturing method of the radio wave transmission cover of the first and second embodiments, the transparent resin or the resin is potted on the surface of the cover base material on which the pseudo fin portion is formed, thereby forming the laminated structure. It is possible to reduce the number of molds required for manufacturing the radio wave transmission cover made of.

By forming the transparent resin or the resin by potting on the cover base material, it becomes easy to form the radio wave transmission cover having a laminated structure with a constant thickness.

Further, the radio wave transmission cover manufactured by the step of black-painting the portion of the cover base material on which the pseudo fin portion is formed excluding the pseudo fin portion does not have the portion excluding the pseudo fin portion. As it is visually recognized, the sense of unity between the radio wave transmission cover and the front grille becomes higher.

[0046]

As described above, according to the method of manufacturing a radio wave transmission cover of the present invention, it is possible to mold the radio wave transmission cover with a small number of types of dies and to manufacture it with a small number of steps. Further, it becomes possible to easily manufacture a radio wave transmission cover having a constant thickness.

[Brief description of drawings]

FIG. 1 is a state diagram showing a state in which a radio wave transmission cover manufactured by a manufacturing method according to a first embodiment of the present invention is arranged on a front grill of an automobile.

FIG. 2 is an enlarged view of an essential part showing a state in which the radio wave transmission cover manufactured by the manufacturing method according to the first embodiment of the present invention is arranged on the front grill of an automobile.

FIG. 3 is a perspective view of a radio wave transmission cover manufactured by the manufacturing method according to the first embodiment of the present invention.

FIG. 4 is a cutaway view of the radio wave transmission cover of FIG. 3 cut along AA ′.

FIG. 5 is a perspective view of a radio wave transmission cover manufactured by a manufacturing method according to a second embodiment of the present invention.

6 is a cutaway view of the radio wave transmission cover of FIG. 5 cut along BB ′.

[Explanation of symbols]

1: Radio wave transmission cover 6: Screw leg part 7: Screw hole part 8: Fitting leg part 10: Cover base material 11: Base material body 12: Convex part
13: Metal thin film 14: Frame part 15: Pseudo fin part 16: Transparent resin layer 17: Black coating layer 18: Radio wave transmission cover 19: Screw leg part 20: Screw hole 21: Fitting leg part 22: Cover base material 23 : Base material body 24: Recessed portion 25: Metal thin film 26: Pseudo fin portion 27: Resin layer 28: Black coating layer

Claims (3)

[Claims] 1. A method of manufacturing a radio wave transmission cover, wherein the radio wave transmission / reception device is disposed on a front grill of a vehicle having a grid-shaped fin portion, and a radio wave transmitting / receiving device is disposed on a back side thereof, the shape corresponding to the shape of the fin portion. First step of forming a cover base material having convex portions, and a second step of forming a metal thin film on the surface of the convex portions to form pseudo fin portions; and the pseudo fin portion of the cover base material. And a third step of forming a transparent resin by potting on a surface on which the radio wave is formed. 2. A method of manufacturing a radio wave transmission cover, which is disposed on a front grill of a vehicle having a grid-shaped fin portion, and a radio wave transmitting / receiving device is disposed on a back side thereof, the method being complementary to the shape of the fin portion. A first step of molding a cover base material having a shaped recess with a transparent resin; a second step of forming a metal thin film on the surface of the recess to form a pseudo fin portion; A third step of potting a resin on the surface on which the pseudo fin portion is formed, and a method for manufacturing a radio wave transmission cover. 3. The radio wave transmission according to claim 1, further comprising a fourth step of black-painting a portion of the surface of the cover base material on which the pseudo fin portion is formed, excluding the pseudo fin portion. Cover manufacturing method.