Antenna device

Abstract

To provide an antenna device capable of temporarily fixing an antenna so that the antenna does not come off from a wall surface mounting metal fitting when the antenna is attached to the wall surface mounting metal fitting.SOLUTION: An antenna fixing portion 3, which is molded integrally with a resin case 1 on a side opposite to a reception sensitivity direction and which fixes an antenna 2, is temporarily attached to a wall surface mounting metal fitting 5, which is mounted in advance on a wall surface 8 or the like, and is fixed with a bolt 53 and a nut 54 attached to the wall surface mounting metal fitting 5. To prevent the antenna fixing portion 3 from coming off when temporarily attached to the wall surface mounting metal fitting 5, a portion of a surrounding area supporting the bolt 53 of the wall surface mounting metal fitting 5 is formed into an anti-coming off protrusion 50 which rises inwardly in a substantially hemispherical shape, and the antenna fixing portion 3 is formed with an engagement recess 30 which is recessed in a substantially hemispherical shape and which can freely engage with the anti-coming off protrusion 50 at an end of a bolt insertion groove 31 into which the bolt 53 is inserted. The engagement recess 30 engages with the anti-coming off protrusion 50, allowing the antenna 2 to be temporarily attached and fixed freely.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] The present invention relates to an antenna device that houses a reflecting element and a feeding element inside a resin case, and more particularly, to a technical field of an antenna device that can be safely temporarily fixed so that it does not come loose when attaching an antenna device for receiving terrestrial digital broadcasting to a wall or pole of a house until the fixing bolt is tightened. [Background technology]

[0002] In recent years, antennas for receiving terrestrial digital broadcasts have shifted from exposed Yagi antennas to designer antennas in which the antenna elements are covered with resin. Among these antennas, for example, Patent Document 1 listed below discloses an antenna that is mainly mounted on a wall surface, which comprises a protruding portion 120 formed integrally with a back surface 110 of an antenna device 100, and a support bracket 200 that is connected to the protruding portion 120 and is fixed to an object 1 to which the antenna device 100 is to be mounted to support the antenna device 100, the support bracket 200 including a base 210, a pair of protruding pieces 220, and a bolt fastener 240, the protruding portion 120 including a pair of end faces 121 facing the pair of protruding pieces 220, and a bolt fastener 240. The antenna support includes a plurality of fitting grooves 123, 124, 125, any one of which is selectively fitted with a bolt fastener 240, a connecting groove 126 which connects each of the plurality of fitting grooves 123, 124, 125 to each other, and an opening 127 which allows the bolt fastener 240 to pass into the connecting groove 126 from the outside of the protrusion 120, and the bolt 240 of the wall support bracket 200 is held by each of the protrusions 123p, 124p, 125p formed in the first, second and third fitting grooves 123, 124 and 125. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-175551 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the structure of the antenna support in Patent Document 1, when installing the antenna, a large force was sometimes required for bolt 240 to pass through projections 123p, 124p, and 125p. Also, if projections 123p, 124p, and 125p weaken with age, bolt 240 can easily come out, which is inconvenient from the standpoint of safety. Furthermore, because the rotation angle relative to the wall is limited to 60 degrees, when the incoming radio waves are coming from directly in front of the entrance, there are cases in which the antenna cannot be installed on the wall where the entrance is located, and if it is installed on another wall, there is the problem that the antenna angle cannot be adjusted, and this issue is considered to be a problem that needs to be solved.

[0005] Therefore, an object of the present invention is to provide a structure that, when attaching an antenna to a wall mounting bracket attached to a wall surface or the like, can safely temporarily secure (temporarily fix) the antenna so that it does not come off the wall mounting bracket until the fixing bolt is tightened. Another object of the present invention is to provide an antenna device that realizes a structure in which the angle between an axis perpendicular to a wall surface and the central axis of the antenna's reception sensitivity can be rotated up to nearly 90 degrees, and when the rotation angle reaches nearly 90 degrees, the cables wired on the back surface of the antenna are not visible, resulting in a neat appearance. [Means for solving the problem]

[0006] As a means for solving the problem, the invention described in claim 1 provides an antenna 2 device in which an antenna element is disposed in a resin case 1, An antenna fixing part 3, which is integrally molded with the resin case 1 on the side opposite to the receiving sensitivity direction and fixes the antenna 2, is temporarily fixed to a wall mounting bracket 5 that is attached to a wall surface 8 in advance, and is fastened and fixed by a bolt 53 and a nut 54 attached to the wall mounting bracket 5, In order to prevent the antenna fixing part 3 from coming off when it is temporarily fixed to the wall mounting bracket 5, the peripheral part supporting the bolt 53 of the wall mounting bracket 5 is formed as a drop-out prevention protrusion 50 that protrudes inward in a substantially hemispherical shape, On the other hand, in the antenna fixing portion 3, a substantially hemispherical recess 30 is formed at an end of a bolt insertion groove 31 into which the bolt 53 of the wall mounting bracket 5 is inserted, into which the fall-out prevention protrusion 50 can be freely engaged. The wall mounting bracket 5 has a projection 50 for preventing the antenna 2 from coming loose and an engagement recess 30 for the antenna fixing portion 3 for engaging with the projection 50, so that the antenna 2 can be temporarily and freely fixed. The antenna device is characterized by the above.

[0007] The invention described in claim 2 is an antenna 2 device in which an antenna element is disposed in a resin case 1, An antenna fixing part 3, which is integrally molded with the resin case 1 on the side opposite to the reception sensitivity direction and fixes the antenna 2, is temporarily fixed to a wall mounting bracket 5 which is held by a pole mounting bracket 6 on a pole 7, and is fastened and fixed by a bolt 53 and a nut 54 attached to the wall mounting bracket 5. In order to prevent the antenna fixing part 3 from coming off when it is temporarily fixed to the wall mounting bracket 5, the peripheral part supporting the bolt 53 of the wall mounting bracket 5 is formed as a drop-out prevention protrusion 50 that protrudes inward in a substantially hemispherical shape, On the other hand, in the antenna fixing portion 3, a substantially hemispherical recess 30 is formed at an end of a bolt insertion groove 31 into which the bolt 53 of the wall mounting bracket 5 is inserted, into which the fall-out prevention protrusion 50 can be freely engaged. The wall mounting bracket 5 has a projection 50 for preventing the antenna 2 from coming loose and an engagement recess 30 for the antenna fixing portion 3 for engaging with the projection 50, so that the antenna 2 can be temporarily and freely fixed. The antenna device is characterized by the above.

[0008] The invention described in claim 3 is such that the antenna fixing part 3 is formed at the lower part of the vertically long antenna 2, and the bolt insertion grooves 31 are formed at three positions in the vertical direction, on the left, right and center, The substantially hemispherical engagement recesses 30 are formed at the upper end 31a and the lower end 31b of the bolt insertion groove 31, When any one of the engagement recesses 30 of the three bolt insertion grooves 31 is engaged with the fall-off prevention protrusion 50 of the wall mounting bracket 5, the antenna 2 can be adjusted in angle up to 180 degrees with respect to the wall surface 8 or the pole 7, with the center T of any one of the engagement recesses 30 as the central axis. 3. The antenna device according to claim 1 or 2,

[0009] The invention described in claim 4 is such that the wall mounting bracket 5 is formed with a vertical surface portion 51 and horizontal surface portions 52 bent horizontally above and below the vertical surface portion 51, the upper and lower horizontal surface portions 52 are formed with the slip-out prevention protrusions 50 on the inner peripheral portion of a through hole 52a penetrating the tip portions of the upper and lower horizontal surface portions 52, and the bolt 53 is inserted into the through hole 52a, The length K from the central axis P of the bolt 53 to the vertical surface 51 is longer than the length W from the center T of either the left or right engagement recess 30 of the antenna fixing part 3 to the antenna side surface 32 on the side surface closer to the antenna fixing part 3, When either the left or right engagement recess 30 is engaged with the fall-off prevention protrusion 50, the antenna fixing part 3 can be rotated up to 90 degrees in either the left or right direction. The antenna device according to claim 3 is characterized in that:

[0010] The invention described in claim 5 is characterized in that a decorative cover 4 for covering a wiring cable from an output terminal 21 on a rear surface 20 of the antenna 2 is detachably provided on the rear surface 20 of the antenna; The antenna device according to claim 1 or 2 is characterized in that: Effect of the Invention

[0011] According to the antenna device of claims 1 and 2 of the present invention, when the antenna is attached to a wall or pole, the approximately hemispherical convex portion of the wall mounting bracket attached to the wall or the like and the approximately hemispherical concave portion of the antenna fixing portion engage with each other to temporarily fasten (temporarily fix), so that the antenna will not fall even if it is released, making installation very easy and ensuring safety. When the orientation of the antenna is determined and fixed, the approximately hemispherical convex portion and the approximately hemispherical concave portion tightly engage and fit together in a spherical shape, generating a frictional force that achieves firm fixation. In addition, according to the inventions of claims 3 and 4, the rotation angle of the antenna's receiving direction can be adjusted to a maximum of 180 degrees, 90 degrees to the left and right, making it possible to match the design of the house regardless of the direction from which radio waves are arriving. Furthermore, by using a decorative cover as in claim 5, the amplifier attached to the back of the antenna and the wiring cables to these devices can be prevented from being clearly visible, providing a better aesthetic appearance. [Brief description of the drawings]

[0012] [Figure 1] 1A and 1B show an antenna fixing portion of an antenna device of the present invention, in which (A) is an overall perspective view and (B) is an enlarged perspective view. [Diagram 2] 1A is a perspective view and FIG. 1B is a side view showing the wall mounting bracket. [Figure 3A] 13 is a partially enlarged perspective view showing the state in which the antenna fixing part is engaged with the wall mounting bracket. FIG. [Figure 3B] FIG. 3B is a plan view of FIG. 3A. [Figure 3C] FIG. 3C is a plan view showing a state rotated 90 degrees to the right from the state of FIG. 3B. [Figure 4] 1 is a perspective view showing the antenna device immediately before the decorative cover is attached; FIG. [Diagram 5] 1 is a perspective view of an antenna device with a decorative cover attached; [Figure 6A] 11 is a different perspective view of the antenna device with a decorative cover attached. FIG. [Figure 6B]Fig. 6B is a perspective view showing a state in which the decorative cover is slightly opened from the state in Fig. 6A, and in Fig. 6B, the wall mounting bracket is attached. [Figure 7A] 1 is a perspective view showing the antenna device of the present invention attached to a pole, as viewed from the rear side. FIG. [Figure 7B] FIG. 7B is a front perspective view of FIG. 7A. BEST MODE FOR CARRYING OUT THEINVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an antenna device according to the present invention will now be described with reference to the drawings. The rear surface 20 of the antenna 2 is provided with screw holes 25 for mounting the amplifier 22 shown in Fig. 4 (Fig. 1), allowing the amplifier 22 to be freely mounted as required. The amplifier 22, which is mounted inside the decorative cover 4, is not visible from the outside, including the wiring cables 26, 27, and 28 (see Figs. 4 to 5 and 7).

[0014] <First Example> To summarize the antenna device of the first embodiment of the present invention, this antenna device is a terrestrial digital broadcasting receiving antenna 2 in which antenna elements (such as a reflecting element and a feeding element) are arranged inside a resin case 1, and an antenna fixing part 3 for fixing the antenna 2, which is molded integrally with the resin case 1 on the side opposite to the receiving sensitivity direction, is temporarily attached (provisionally fixed) to a wall mounting bracket 5 which is attached in advance to a wall 8, and is tightened and fixed with a bolt 53 and a nut 54 attached to the wall mounting bracket 5. In order to prevent the antenna fixing part 3 from coming off when it is temporarily fixed to the wall mounting bracket 5, the surrounding area supporting the bolt 53 of the wall mounting bracket 5 is formed as a drop-out prevention protrusion 50 that rises inward in a substantially hemispherical shape. Meanwhile, the antenna fixing part 3 is formed with an engagement recess 30 that is recessed in a substantially hemispherical shape at the end of the bolt insertion groove 31 into which the bolt 53 of the wall mounting bracket 5 is inserted, into which the drop-out prevention protrusion 50 can freely engage. Thus, the engagement recess 30 of the antenna fixing part 3 engages with the drop-out prevention protrusion 50 of the wall mounting bracket 5, allowing the antenna 2 to be temporarily fixed or fixed freely.

[0015] More specifically, as shown in Fig. 2, the wall mounting bracket 5 has an overall U-shaped shape and is formed of a vertical surface portion 51 and horizontal surface portions 52 bent horizontally above and below the vertical surface portion 51. A through hole 52a is formed at the tip of each of the upper and lower horizontal surface portions 52, through which a bolt 53 can be passed. This through hole 52a is larger than the diameter of the bolt, so that it can accommodate cases in which the horizontal surface portion 52 is bent. A substantially hemispherical inwardly protruding slip-out prevention protrusion 50 is formed on the inner periphery of the through hole 52a (see FIG. 2B), and a bolt 53 is inserted through the through hole 52a. In order to increase the resistance to rotation, it is also preferable to form a convex streak 50a perpendicular to the direction of rotation in the slip-out prevention protrusion 50 (FIG. 2A).

[0016] 3A, the length K from the central axis P of the attachment bolt 53 to the vertical surface 51 is longer than the length W from the center T of either the left or right engagement recess 30 of the antenna fixing part 3, which will be described later, to the antenna side surface 32 on the closer side of the antenna fixing part 3. The space from the bolt 53 to the vertical surface 51 forms a space S in which the antenna fixing part 3, which will be described later, can rotate (see FIGS. 2 and 3). In order to allow the antenna fixing part 3 to smoothly enter the wall mounting bracket 5 when the antenna fixing part 3 is attached and temporarily fixed (temporarily secured), the horizontal surface part 52 is formed with a punched-out space 52b at its center so that the horizontal surface part 52 has elasticity (see FIG. 2A).

[0017] On the other hand, as shown in Fig. 1, an antenna fixing part 3 is integrally formed at the lower part of the back surface 20 of the vertically long antenna 2. In this antenna fixing part 3, at a part (see symbol T) which is the center of the axis for rotating the antenna 2, three vertically long bolt insertion grooves 31, which are open toward the back surface and into which the bolts 53 of the wall mounting bracket 5 are inserted, are formed in the vertical direction at the left, right and center. In an embodiment in which the left and right bolt insertion grooves 31 are formed in a J-shape when viewed from above, is preferable, but is not limited to this. At the upper end 31a and the lower end 31b of the bolt insertion grooves 31, engagement recesses 30 formed in a substantially hemispherical shape are provided so that the fall-out prevention protrusions 50 of the wall mounting bracket 5 can be freely engaged (see Figs. 1B and 6A). Therefore, even if one bolt insertion groove 31 for fixing to the wall surface 8 is used, the remaining two are left empty, and it is possible to push the wiring cable 27 from the BS antenna into the remaining bolt insertion groove 31, and push the wiring cable 28 for home shared reception into the other bolt insertion groove 31. This makes it possible to improve the appearance (see Figures 4 and 5).

[0018] As shown in FIG. 3A, the length K from the central axis P of the attachment bolt 53 of the wall mounting bracket 5 to the vertical surface portion 51 is longer than the length W from the center T of either the left or right engagement recess 30 of the antenna fixing portion 3 to the antenna side surface 32 on the closer side of the antenna fixing portion 3, so that when either the left or right engagement recess 30 is engaged with the anti-slip protrusion 50, the antenna fixing portion 3 can be rotated up to 90 degrees in either the left or right direction by utilizing the space S of the wall mounting bracket 5 (FIGS. 3A, B, C). In other words, when the left or right engagement recess 30 of the three bolt insertion grooves 31 engages with the anti-slip protrusion 50 of the wall mounting bracket 5, the angle of the antenna 2 can be adjusted up to 180 degrees relative to the wall surface 8, with the center T of the engagement recess 30 as the central axis.

[0019] Thus, when the antenna fixing part 3 is inserted into the wall mounting bracket 5, the approximately semispherical anti-slip protrusion 50 and the engagement recess 30 firmly mesh and engage with each other, so that the antenna 2 will not come off the wall mounting bracket 5 even if you let go of the antenna 2. In addition, since the engagement recess 30 (approximately hemispherical recess) and the anti-slip protrusion 50 (approximately hemispherical protrusion) are uneven, the frictional resistance between the antenna fixing part 3 and the wall mounting bracket 5 can be set large, and by tightening the bolt 53 with the nut 54, the antenna 1 is held immobile and does not rotate.

[0020] As described above, in this embodiment, the rotation axis of the bolt 53 used to adjust the direction of the antenna 2 is formed by forming an approximately hemispherical engagement recess 30 on the antenna fixing portion 3 made of resin, and a protrusion 50 for preventing the bolt 53 from falling out, which engages with the engagement recess 30, is formed on the wall mounting bracket 5, and the center of the approximately hemispherical recess 30 and protrusion 50 serves as the rotation axis, so that smooth and delicate adjustments can be achieved, thereby improving the reception performance of the antenna 2.

[0021] 4 to 6, in the above-mentioned antenna device, a decorative cover 4 that covers a wiring cable 26 from an output terminal 21 on the rear surface 20 of the antenna 2 and wiring cables (coaxial cables) 27, 28 from the amplifier 22 is detachably provided on the antenna rear surface 20. This decorative cover 4 has no front surface or bottom surface, and is configured as a lid body with four surfaces: a back surface, both side surfaces, and a top surface. That is, as shown in Fig. 4, the upper ends of the antenna back surface 20 are provided with locking pieces 23 that are open at the top and bottom and have a U-shaped shape when viewed in the plan view, and the lower ends of the antenna back surface 20 are provided with locking pieces 23 to which outward screw fixing pieces 24 with screw holes are attached. At the same time, the decorative cover 4 is provided with a total of four locking edges 40 corresponding to the positions of the locking pieces 23. Therefore, the decorative cover 4 can be easily attached by hooking the decorative cover 4 on the antenna back surface 20 from a slightly upward direction and pressing it toward the antenna main body. On the other hand, the decorative cover 4 can be easily removed from the antenna main body by sliding the decorative cover 4 slightly upward from the fixed state. In addition, a hole 41 for fixing a screw is drilled in the side of the decorative cover 4 at a position corresponding to the screw fixing piece 24 on the back surface 20 of the antenna, and a fixing screw 42 is passed through the hole 41 and fixed to the screw fixing piece 24, so that the cover 4 will not slide upward and come off in strong winds (Figure 5).

[0022] Thus, by attaching such a decorative cover 4, the appearance of the antenna 2 installed on the wall surface 8 of the house is improved. In addition, by attaching the decorative cover 4 as shown in Fig. 6 to the rear surface 20 of the antenna, it is possible to prevent the wiring cables 26, 27, 28 from fluttering in the wind and striking the antenna 2 when a strong wind blows, thereby preventing noise from being generated.

[0023] <Second Example> The above-mentioned antenna device can also be mounted on a pole 7. The second embodiment shown in Fig. 7 has almost the same configuration as the first embodiment described above, so a duplicated description will be omitted. The difference is that the wall mounting bracket 5, which is attached to a wall surface 8, is fixed to the pole 7 by a bolt 60 so as to sandwich the pole 7 with the pole mounting bracket 6 (FIG. 7A). However, when installing the antenna 2 on such a pole 7, the engagement recess 30 of the antenna fixing part 3 engages with the fall-out prevention protrusion 50 of the wall mounting bracket 5, allowing for free temporary and fixed fixing of the antenna 2. As shown in Fig. 7A, by attaching the antenna fixing part 3 to the wall mounting bracket 5 using the central bolt insertion groove 31, a stable state with respect to the pole 7 is ensured.

[0024] Although the embodiments have been described above based on the drawings, it should be noted that the present invention is not limited to the illustrated examples, and includes the range of design modifications and application variations that would normally be made by a person skilled in the art, provided that the scope does not deviate from the technical concept of the present invention. [Explanation of symbols]

[0025] 1 Resin case 2 Antennas 20 Back side 21 Antenna output terminal 22 Amplifier 23 Locked piece 24 Screw fixing piece 25 Screw hole 26 Wiring cable 27 Wiring cable 28 Distribution cable 3 Antenna fixing part 30 Engagement recess 31 Bolt insertion groove 31a top end 31b Bottom end 32 Antenna side 4. Makeup cover 40 Locking piece 41 Screw fixing hole 5 Wall Mounting Bracket 50 Anti-slip protrusion 50a Ridge 51 Vertical section 52 Horizontal part 52a through hole 52b Punching section 53 Volts 54 Nut 6 Pole mounting bracket 7. Paul 8. Wall K, W length P Bolt center axis T Center of engagement recess S Space

Claims

1. In an antenna device in which an antenna element is disposed in a resin case, An antenna fixing portion that is integrally molded with the resin case on the opposite side to the receiving sensitivity direction and that fixes the antenna is temporarily fixed to a wall mounting bracket that is attached to a wall in advance, and is fastened and fixed with bolts and nuts provided on the wall mounting bracket, In order to prevent the antenna fixing part from coming off when it is temporarily fixed to the wall mounting bracket, a peripheral portion supporting the bolt of the wall mounting bracket is formed as a drop-out prevention protrusion that protrudes inward in a substantially hemispherical shape, On the other hand, the antenna fixing portion has an engagement recess formed at an end of a bolt insertion groove into which the bolt of the wall mounting bracket is inserted, the engagement recess being recessed into a substantially hemispherical shape with which the fall-out prevention protrusion can be freely engaged, The wall mounting bracket is configured so that the engagement recess of the antenna fixing portion is engaged with the fall-off prevention protrusion of the wall mounting bracket, so that the antenna can be freely temporarily fixed or fixed. An antenna device comprising:

2. In an antenna device in which an antenna element is disposed in a resin case, An antenna fixing portion that is molded integrally with the resin case on the opposite side to the receiving sensitivity direction and fixes the antenna is temporarily fixed to a wall mounting bracket that is clamped by a pole mounting bracket on a pole, and is fastened and fixed by bolts and nuts provided on the wall mounting bracket, In order to prevent the antenna fixing part from coming off when it is temporarily fixed to the wall mounting bracket, a peripheral portion supporting the bolt of the wall mounting bracket is formed as a drop-out prevention protrusion that protrudes inward in a substantially hemispherical shape, On the other hand, the antenna fixing portion has an engagement recess formed at an end of a bolt insertion groove into which the bolt of the wall mounting bracket is inserted, the engagement recess being recessed into a substantially hemispherical shape with which the fall-out prevention protrusion can be freely engaged, The wall mounting bracket is configured so that the engagement recess of the antenna fixing portion is engaged with the fall-off prevention projection of the wall mounting bracket, so that the antenna can be temporarily and fixed freely. An antenna device comprising:

3. The antenna fixing portion is formed on a lower portion of the vertically long antenna, and the bolt insertion grooves are formed in three positions in the vertical direction on the left, right, and center, The substantially hemispherical engagement recesses are formed at the upper and lower ends of the bolt insertion groove, When the engaging recess of any one of the three bolt insertion grooves is engaged with the fall-off prevention protrusion of the wall mounting bracket, the antenna can be rotated and angle-adjusted up to 180 degrees with respect to the wall or pole with the center of any one of the engaging recesses as a central axis.

3. The antenna device according to claim 1 or 2,

4. The wall mounting bracket is formed with a vertical surface portion and horizontal surface portions bent horizontally above and below the vertical surface portion, the anti-slip projection is formed on the inner peripheral portion of a through hole penetrating the tip portions of the upper and lower horizontal surfaces, and the bolt is inserted into the through hole, The length from the central axis of the bolt to the vertical surface is longer than the length from the center of either the left or right engagement recess of the antenna fixing part to the antenna side surface on the side surface closer to the antenna fixing part, When the left or right engagement recess is engaged with the fall-off prevention protrusion, the antenna fixing part can be rotated up to 90 degrees in either the left or right direction.

4. The antenna device according to claim 3,

5. A decorative cover for covering a wiring cable extending from an output terminal on the rear surface of the antenna is provided on the rear surface of the antenna in a removable manner.

3. An antenna device according to claim 1 or 2.

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