JP5213250B2 - antenna - Google Patents

Description

  The present invention relates to an antenna used for AM / FM radio wave reception and the like, and more particularly to an antenna having a structure suitable for in-vehicle use.

  As a vehicle-mounted antenna for receiving AM / FM radio waves, a multistage rod antenna or an antenna using a helical coil so that the antenna protrusion length is shortened is known.

  5A and 5B show a conventional example of such a vehicle-mounted antenna, which has a base body 10 having a feeding cylindrical portion 11 and a rotation-preventing convex portion 13 on the bottom surface, and is supported on the base body 10. A circuit board (not shown), a cover 20 that covers the upper side of the base body 10 and the circuit board, a temporary fixing holder 30 that is fixed to the base body 10, and a watertight seal elastic pad that is attached to the bottom surface of the base body 10 The rubber pad 40 is provided.

  A screw portion 21 is provided on the upper portion of the cover 20 so that an antenna element portion 25 such as a rod antenna or a helical coil indicated by a virtual line is connected. The feeding cylindrical portion 11 is hollow for passing a feeding line (not shown) (coaxial cable or the like) connected to the circuit board and the antenna element portion.

  When the holder for temporary fixing 30 is inserted into the mounting hole 51 of the vehicle body panel 50 (for example, the vehicle body roof), the nut is attached to the male screw portion 11a formed on the outer periphery of the cylindrical portion for power supply 11. This is a member for temporarily fixing the base body 10 so as not to come out of the mounting hole 51 until the base body 10 is fixed to the vehicle body panel 50 by screwing. As shown in FIGS. 6A and 6B, the temporary fixing holder 30 is integrally formed by changing the thickness of the attachment base 31, the pair of arms 32, and the lower end of the arms. And a locking claw 33.

  As shown in FIG. 5B, the attachment base portion 31 of the temporary fixing holder 30 is fixed to the base body 10 with screws 35, and the arm portion 32 extends downward along the outer wall surface of the feeding cylindrical portion 11. Arrangement. A concave portion 12 is formed on the outer wall surface of the feeding cylindrical portion 11 so as not to hinder the inward bending operation of the arm portion 32. That is, contact between the arm portion 32 and the outer wall surface of the feeding cylindrical portion 11 is avoided by the recess 12.

  The cover 20 is fixed to the base body 10 with screws 26 from the bottom surface side of the base body 10, and the rubber pad 40 is also attached to the bottom surface side of the base body 10 at that time.

  The operation of the temporary fixing holder 30 when the antenna of the conventional example is attached to the vehicle body panel 50 will be described with reference to FIGS.

  As shown in FIG. 7A, only the arm portion 32 bends (bends) when the antenna is inserted. In particular, the J portion of the arm portion 32 bends. As a result, the locking claw 33 of the arm portion 32 inserted into the mounting hole 51 from the outer surface of the vehicle body panel 50 serves as a guide for the outer taper to bend the arm portion 32 inward and pass through the mounting hole 51, and FIG. As shown in (B), the antenna is temporarily held by being caught on the inner surface of the vehicle body panel 50. When a load is applied in the antenna upward direction (withdrawal direction) after insertion as shown in FIG. 7B, the portion K of the locking claw 33 does not have a bending function (a function that spreads outward), so the removal force (withdrawal) It is difficult to secure a sufficiently large force).

  FIG. 5B shows a temporary holding state in which the feeding cylindrical portion 11 and the arm portion 32 are inserted into the mounting holes 51 of the vehicle body panel 50. In this temporary holding state, the rubber pad 40 as a watertight seal elastic pad is a base body. 10 and the vehicle body panel 50. In this temporarily held state, the antenna is finally fixed to the vehicle body panel 50 by screwing a nut (not shown) into the male screw portion 11a on the outer peripheral surface of the feeding cylindrical portion 11 and tightening.

  Thus, by providing the temporary fixing holder 30 in the antenna, conventionally, one worker has inserted and held the feeding cylindrical portion 11 of the antenna into the mounting hole 51 from the outside of the vehicle body panel 50, It has become possible for another worker to perform the screwing operation of the antenna from the inside of the vehicle body panel 50 with only one worker.

The following Patent Document 1 is given as a publicly known document having the same temporary fixing means as the conventional example.
JP 2000-252724 A

By the way, what is required for the above-mentioned antenna temporary fixing holder is that when the antenna is attached to a mounting panel such as a vehicle body panel, the antenna can be smoothly inserted into the mounting hole and can be mounted on the mounting panel. For example, the antenna is not completely detached during the operation in the nut tightening step). That means
Insertion force (force required for insertion) → Weak as much as possible Pull-out force (force required to pull out) → It is required to be as strong as possible.

  The temporary fixing holder of the conventional example has a structure in which the locking claw is integrally formed by changing the wall thickness of the lower end portion of the arm portion. It was as weak as 30N, and it could come off depending on the way of working. There is a method of increasing the catching amount of the locking claw in order to increase the removal force. However, if this is done, there is a problem that the insertion force is increased and workability is deteriorated.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide an antenna that can increase the removal force while improving the insertion workability while the insertion force remains weak. There is to do.

  Other objects and novel features of the present invention will be clarified in embodiments described later.

In order to achieve the above object, an antenna according to an aspect of the present invention includes a base body having a feeding cylindrical portion on a bottom surface, a cover that covers an upper side of the base body, and a temporary fixing holder provided on the base body. With
The temporary fixing holder is formed of a flexible resin, and has a plurality of main arm portions extending downward along an outer wall surface of the power feeding cylindrical portion, and a lower end portion with respect to the main arm portion. A connected sub-arm part,
In the sub arm portion, the lower end portion serves as a fulcrum for the deflection of the sub arm portion, the upper end portion of the sub arm portion forms a locking claw protruding outward from the outer surface of the main arm portion , and the locking claw is It is characterized by an increase in wall thickness toward the upper end .

  The said aspect WHEREIN: The said main arm part is good in the position where the outer wall surface of the said cylindrical part for electric power feeding mutually opposes.

  The said aspect WHEREIN: The said sub arm part is good to be formed inside the opening provided in the said main arm part.

  The said aspect WHEREIN: A recessed part is formed in the outer wall surface of the said cylindrical part for electric power feeding, and the said main arm part is arrange | positioned inside the said recessed part.

  In the above aspect, a watertight sealing pad may be mounted on the bottom surface of the base body.

  In the above aspect, in the state where the cylindrical portion for power supply is inserted into the hole of the mounted panel from the outer side surface of the mounted panel, the locking claw is caught on the inner side surface of the mounted panel, and the cylindrical shape for power supply The locking claw may be structured to open outwardly with respect to the load in the pulling direction of the part.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the antenna of the present invention, the insertion force with respect to the mounted panel such as the vehicle body panel remains weak, and the removal force can be increased, thereby improving the workability of mounting the antenna to the mounted panel. Is possible.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIGS. 1A, 1B, and 2 show the overall configuration of an antenna according to an embodiment of the present invention, and a metal base body that integrally includes a feeding cylindrical portion 11 and a non-rotating convex portion 13 on a bottom surface. 10, a circuit board (not shown) supported on the base body 10, a resin cover 20 that covers the upper side of the base body 10 and the circuit board, a resin temporary fixing holder 60 that is fixed to the base body 10, and a base A rubber pad 40 as an elastic pad for watertight sealing mounted on the bottom surface of the body 10 is provided, and the configuration other than the temporary fixing holder 60 is the same as that of the conventional example of FIGS.

  The temporary fixing holder 60 is a male screw formed on the outer periphery of the power feeding cylindrical portion 11 when the power feeding cylindrical portion 11 is inserted into the mounting hole 51 of the vehicle body panel 50 (for example, a vehicle body roof) as a mounted panel. This is a member for temporarily fixing the base body 10 so as not to come out of the mounting hole 51 until the base body 10 is fixed to the vehicle body panel 50 by screwing the nut into the portion 11a.

  As shown in FIGS. 3A and 3B, the temporary fixing holder 60 is connected to the attachment base 61, a pair (a plurality) of main arm parts 62, and the main arm part 62 at the lower end S. The sub-arm portion 63 is formed of a flexible resin so that the arm portions 62 and 63 can exhibit sufficient flexibility. The sub arm portion 63 is formed inside an opening 64 provided in the main arm portion 62, the lower end portion S serves as a fulcrum for bending of the sub arm portion 63, and the upper end portion of the sub arm portion 63 is formed from the outer surface of the main arm portion. Is also formed with a locking claw 65 protruding outward. The locking claw 65 increases in thickness toward the upper end, and the protruding amount also increases. The locking claw 65 can be bent in the direction in which the amount of protrusion is reduced as shown by the dotted line in FIG. 4A with the lower end S as the fulcrum of bending, and as shown by the dotted line in FIG. It is also possible to bend in the direction in which the amount of protrusion increases.

  As shown in FIG. 1B, the attachment base 61 of the temporary fixing holder 60 is fixed to the base body 10 with screws 68, and the recess 12 is formed at a symmetrical position on the outer wall surface of the feeding cylindrical portion 11. The main arm 62 is located inside the recess 12. As a result, the main arm portion 62 is located at a position where the outer wall surface of the power feeding cylindrical portion 11 faces each other and extends downward along the outer wall surface. Since the concave portion 12 is formed on the outer wall surface of the feeding cylindrical portion 11, the outer wall surface does not hinder the bending operation toward the inside of the main arm portion 62. That is, contact between the main arm portion 62 and the outer wall surface of the feeding cylindrical portion 11 is avoided by the recess 12.

  The action of the temporary fixing holder 60 when the antenna is attached to the vehicle body panel 50 will be described with reference to FIGS.

  As shown in FIG. 4A, when the antenna is inserted, the main arm portion 62 is bent (particularly, the P portion of the main arm portion 62 is bent), and the Q portion of the sub arm portion 63 is bent and moves. As a result, the locking claw 65 of the sub arm portion 63 inserted into the mounting hole 51 from the outer surface of the vehicle body panel 50 serves as a guide, and the outer taper serves as a guide, and is attached by a bending operation to the inside of the main arm portion 62 and the sub arm portion 63. Passing through the hole 51, the antenna is temporarily held by being caught on the inner surface of the vehicle body panel 50 as shown in FIG. At that time, since both the main arm portion 62 and the sub arm portion 63 can be bent, the insertion into the attachment hole 51 can be performed with a smaller insertion force, and the insertability can be improved.

  4B, when a load is applied in the upward direction (withdrawal direction) of the antenna, and the Q portion of the sub arm portion 63, that is, the upper end of the locking claw 65 hits the inner side surface of the vehicle body panel 50. In addition, since the locking claw 65 has a structure that bends and expands outward as indicated by the dotted line in FIG. 4 (B), it is possible to increase the removal force (the force necessary to pull out), and the temporary holding state. The antenna holding force can be improved.

  Then, as shown in FIG. 1B, a temporary holding state in which the feeding cylindrical portion 11, the main arm portion 62, and the sub arm portion 63 are inserted into the mounting holes 51 of the vehicle body panel 50 (in this state, the rubber pad 40 is the base body 10). The nut (not shown) is screwed into the male threaded portion 11a on the outer peripheral surface of the feeding cylindrical portion 11 and tightened, thereby finalizing the antenna to the vehicle body panel 50. Fix it.

  According to the present embodiment, the following effects can be achieved.

(1) By providing the antenna base body 10 with the temporary fixing holder 60, the antenna can be fixed to the vehicle body panel 50 by a single worker. When the temporary fixing holder 60 is attached to the mounting hole 51 from the outer surface (inserting the main arm portion 62 and the sub arm portion 63), the insertion force is further increased by bending both the main arm portion 62 and the sub arm portion 63. The insertion workability can be improved.

(2) In the temporary holding state after insertion, the catching claws 65 of the sub-arm portion 63 expand outward, so that the removal force can be increased and the antenna holding force can be improved. Thereby, the workability of the fixing work by the nut of the antenna can be improved. Further, the fact that the protruding amount of the locking claw 65 from the outer surface of the main arm portion can be set to a large amount can contribute to an increase in the pulling force.

(3) From these, in the conventional example of FIG. 5, the insertion force was about 30 N and the removal force was about 30 N. In this embodiment, for example, the insertion force can be reduced to about 5 N, and the removal force is about It becomes possible to increase to about 150N.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the above embodiment, the structure has been described in which the male screw portion is provided on the power feeding cylindrical portion of the base body, and the antenna is attached to the mounted panel by screwing the nut into this, but the power feeding cylindrical portion of the base body is described. A structure may be employed in which an antenna is attached by providing a male screw or a female screw at a different position. Further, the mounted panel is not limited to the vehicle body panel.

  In the above embodiment, the main arm is a pair (two) and is provided at a position where the feeding cylindrical portions face each other. However, there are three or more main arms, for example, a feeding cylindrical shape. It may be arranged at equiangular intervals around the part.

It is embodiment of the antenna which concerns on this invention, Comprising: (A) is a side view, (B) is the II arrow expanded sectional view. It is a perspective view which shows the external appearance of embodiment, and the attachment hole of a vehicle body panel. It is the holder for temporary fixation used in embodiment, Comprising: (A) is a side view, (B) is a front view. The insertion operation to the vehicle body panel of the said holder for temporary fixing is shown, (A) is a front view at the time of insertion, (B) is a front view after insertion. It is a prior art example of an antenna, (A) is a side view, (B) is the VV arrow expanded sectional view. It is the holder for temporary fixation used in a prior art example, Comprising: (A) is a side view, (B) is a front view. The insertion operation to the vehicle body panel of the temporary fixing holder of a prior art example is shown, (A) is a front view at the time of insertion, (B) is a front view after insertion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Base body 11 Feeding cylindrical part 12 Concave part 13 Anti-rotation convex part 20 Cover 21 Screw part 25 Antenna element part 30, 60 Temporary fixing holder 40 Rubber pad 50 Body panel 51 Attachment hole 61 Attachment base 62 Main arm part 63 Sub arm part 64 Opening 65 Locking claw

Claims (6)

A base body having a cylindrical portion for feeding on the bottom surface, a cover covering the upper side of the base body, and a temporary fixing holder provided on the base body,
The temporary fixing holder is formed of a flexible resin, and has a plurality of main arm portions extending downward along an outer wall surface of the power feeding cylindrical portion, and a lower end portion with respect to the main arm portion. A connected sub-arm part,
In the sub arm portion, the lower end portion serves as a fulcrum for the deflection of the sub arm portion, the upper end portion of the sub arm portion forms a locking claw protruding outward from the outer surface of the main arm portion , and the locking claw is Antenna with increasing wall thickness towards the top .   2. The antenna according to claim 1, wherein the main arm portion is located on an outer wall surface of the feeding cylindrical portion facing each other.   The antenna according to claim 1 or 2, wherein the sub arm portion is formed inside an opening provided in the main arm portion. The antenna according to any one of claims 1 to 3, the outer wall surface of the feeding tubular portion recess is formed, the main arm portion on the inner side of the recess is disposed, the antenna. The antenna according to any one of claims 1 to 4 , wherein a water-tight seal pad is attached to a bottom surface of the base body. The antenna according to any one of claims 1 to 5 , wherein the locking claw is an inner portion of the mounted panel in a state where the feeding cylindrical portion is inserted into a hole of the mounted panel from an outer surface of the mounted panel. An antenna having a structure that is hooked to a side surface and that has a structure in which the locking claw opens outwardly with respect to a load in a pulling direction of the feeding cylindrical portion.

Images