JP5463950B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device, and more particularly to a retractable antenna device installed on a roof of an automobile.

2. Description of the Related Art Generally, an antenna device installed on an automobile roof or the like is configured such that an antenna mounting portion is provided on an upper portion of an antenna base that is mounted on an installation surface, and a base end side of an antenna rod is connected to the antenna mounting portion. (For example, patent document 1).
In addition, a retractable antenna device has been proposed in which an antenna mounting portion is swingably supported by an antenna base so that the antenna rod is held in a standing state or a tilted state (for example, Patent Document 2). . Furthermore, an antenna device has been proposed in which the antenna rod is detachably connected to the antenna mounting portion to prevent the antenna rod from dropping or being stolen (for example, Patent Documents 2 and 3).

JP 2002-64313 A Japanese Patent Laid-Open No. 9-246836 JP 2002-217622 A

By the way, in the antenna device described in Patent Document 2, the inclination of the antenna rod is stepped by meshing the external teeth formed on the main body (73) of the indirect joining element and the internal teeth formed on the ring (63). The position is adjusted and adjusted. Since the main body and the ring of these indirect joining elements serve as a signal transmission path from the antenna rod, they are made of a conductive material such as metal.
Thus, in the antenna device described in the cited document 2, the manufacturing process is complicated because the body and the ring of the indirect joining element are formed by cutting the conductive material, which hinders cost reduction.

  The present invention has been made to solve the above-mentioned problems. By improving the antenna rod fixing structure, the antenna rod can be easily positioned and fixed in two stages, that is, an upright state and a rearward state. An object of the present invention is to provide a retractable antenna device capable of significantly reducing the above.

The invention according to claim 1 includes an antenna rod, an antenna mounting portion to which a base end side of the antenna rod is connected, and an antenna base that accommodates the antenna mounting portion so as to be swingable therein, and the antenna mounting portion. The antenna rod connected to the antenna device extends to the outside through an opening formed in the antenna base and is tiltable in the front-rear direction.
The antenna mounting portion has a flat portion in the vicinity of the connection portion of the antenna rod,
The antenna base has a first flat portion that comes into contact with the flat portion when the antenna rod stands up and a second flat portion that comes into contact with the flat portion when the antenna rod tilts backward. ,
By holding the first flat part or the second flat part between the base end surface of the antenna rod and the flat part, the standing state or the backward state is maintained.

The invention according to claim 2 is the antenna device according to claim 1, wherein the antenna mounting portion has a convex portion that is formed to project on a peripheral surface,
The antenna base locks the convex portion, and a first locking portion that stops swinging of the antenna mounting portion so that the antenna rod does not tilt after the standing state. Then, the antenna rod has a second locking portion for preventing the antenna mounting portion from swinging so that the antenna rod does not tilt after the rearward state.

The invention according to claim 3 is the antenna device according to claim 1 or 2, wherein the base end surface of the antenna rod is formed flat,
An outer surface corresponding to the first flat portion or the second flat portion of the antenna base is formed flat.

  According to a fourth aspect of the present invention, in the antenna device according to any one of the first to third aspects, the antenna rod is screwed to the antenna mounting portion, and the flattening is performed according to tightening of the antenna rod. The portion contacts or separates from the first flat portion or the second flat portion.

  According to a fifth aspect of the present invention, in the antenna device according to any one of the first to fourth aspects, the flat portion, the first flat portion, and the second flat portion are made of a resin material. It is characterized by.

The invention according to claim 6 is the antenna device according to any one of claims 1 to 5, wherein the antenna rod has a shaft that protrudes from a base end surface and has a threaded portion and a flange.
The antenna mounting portion has a substantially cylindrical case member having an insertion port for the shaft on a peripheral surface, a through screw hole coaxial with the insertion port, and a swing shaft having a swing shaft pivoted on the antenna base. A member, and a retaining member having a retaining hole that regulates the insertion direction of the shaft,
The flange member is press-fitted into the retaining hole in a state where the swing shaft member and the retaining member are accommodated in the case member, and the insertion port, the through screw hole, and the retaining hole are arranged coaxially. The screw portion is screwed into the through screw hole.

  According to the antenna device according to the present invention, the antenna rod can be easily positioned and fixed in two stages of the standing state and the backward state, and the manufacturing cost can be significantly reduced.

It is a figure which shows the external appearance of the antenna apparatus which concerns on embodiment. It is a disassembled perspective view which shows the attachment part of an antenna rod. It is a figure which shows the attachment aspect of an antenna attaching part. It is a figure which shows the longitudinal cross section which passes along the central axis of the front-back direction when an antenna rod is fastened in the standing state. It is a figure which shows the longitudinal cross section which passes along the axis | shaft which shifted | deviated in parallel from the central axis of the front-back direction when an antenna rod is fastened in the standing state. It is a figure which shows the longitudinal cross section which passes along the central axis of the front-back direction when an antenna rod is loosened in the standing state. It is a figure which shows the longitudinal cross section which passes along the axis | shaft which shifted | deviated in parallel from the central axis of the front-back direction when it loosens in the state which stood the antenna rod. It is a figure which shows the longitudinal cross section which passes along the axis | shaft which shifted | deviated in parallel from the center axis | shaft of the front-back direction when an antenna rod is loosened and it is set as the backward state. It is a figure which shows the longitudinal cross section which passes along the axis | shaft which shifted | deviated in parallel from the center axis | shaft of the front-back direction when an antenna rod is fastened backward. It is the figure which abbreviate | omitted the antenna rod and showed the longitudinal cross section which passes along the center axis | shaft of the front-back direction when an antenna rod is made into a reverse state.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram illustrating an appearance of an antenna device 1 according to the embodiment. As shown in FIG. 1, the antenna device 1 is a tiltable antenna device in which an antenna rod 10 that receives radio waves such as AM / FM radio is attached to an antenna base 20 so as to be tiltable. The antenna device 1 is fixed to the installation surface by attaching the base plate 26 located at the bottom of the antenna base 20 to the roof of an automobile or the like.
The antenna base 20 has a circuit board on which an amplifier circuit and the like are mounted (for example, on the base plate 26). Wirings 40 such as a power supply cable 41 and a signal output cable 42 are provided on the circuit board. It is connected.

  Here, the antenna rod 10 and the antenna base 20 are manufactured separately in the manufacturing stage. When the antenna device 1 is attached to the installation surface by an automobile manufacturer or the like, the antenna rod 10 is incorporated into the antenna base 20. By making the antenna rod 10 and the antenna base separate, it is possible to reduce packing costs and transportation costs.

  FIG. 2 is an exploded perspective view showing a mounting portion of the antenna rod 10 in the antenna device 1. As shown in FIG. 2, the antenna device 1 includes an antenna rod 10, an antenna mounting portion 30 to which the base end side of the antenna rod 10 is connected, and an antenna base 20 that accommodates the antenna mounting portion 30 so as to be swingable therein. It is configured.

  The antenna rod 10 is configured, for example, by covering the outer surface of a conductive material such as metal with an antenna cover 11 made of an elastic member such as rubber. The base end surface 111 of the antenna rod 10 (antenna cover 11) is formed flat, and the shaft 12 for connecting to the antenna mounting portion 30 protrudes from the base end surface 111. A threaded portion 121 is formed on the proximal end surface 111 side of the shaft 12, and a flange 122 is formed on the distal end side.

  The antenna mounting portion 30 includes a resin inner case 31 molded into a substantially cylindrical shape, a swinging shaft metal fitting 32 pivoted on the guide plate 22, and a retaining metal fitting 33 for restricting the insertion direction of the shaft 12. .

An insertion hole 314 of the shaft 12 is formed in the upper peripheral surface of the inner case 31, and an insertion hole 315 that is coaxial with the insertion hole 314 is formed in the lower peripheral surface. In addition, a stepped portion 316 on which the swing shaft metal fitting 32 and the retaining metal fitting 33 are placed is formed on the inner surface of the inner case 31.
Furthermore, flat portions 311 and 311 are formed on both end edges of the upper peripheral surface of the inner case 31 with an insertion hole 314 interposed therebetween, and a front convex portion 312 and a rear convex portion 313 are formed at substantially the center in the axial direction of the lower peripheral surface. (Refer to FIG. 4) are spaced apart at a predetermined angle.
Since the inner case 31 is made of a resin material, the above-described structure can be easily realized by resin molding.

The rocking shaft member 32 is formed with a through screw hole 322 through which the screw portion 121 of the shaft 12 is screwed from the upper surface to the lower surface. In addition, disk-shaped swing shafts 321 are formed on both axial sides of the swing shaft member 32.
The retaining bracket 33 is made of, for example, spring steel, and has a retaining hole 331 having an inner tooth 331a inclined downward on the inner edge (so-called push nut). A large thrust load is generated on the shaft 12 inserted through the retaining fitting 33 due to the biting of the internal teeth 331a.

  The antenna base 20 is formed in a substantially truncated cone shape and is made of a metal that supports a resin antenna case 21 having an accommodation space for the antenna mounting portion 30 therein and the antenna mounting portion 30 (swing shaft bracket 32) in a swingable manner. The guide plate 22, the guide base 23 attached to the upper part of the antenna case 21 in a state where the antenna attachment portion 30 is placed, and the waterproof rubber 24 are provided.

An opening 215 is formed in the antenna case 21 from the center of the case upper portion 211 to the upper half of the case back portion 212. The antenna rod 10 extends to the outside through the opening 215 and extends in the front-rear direction (here, from vertical to rear). Tilt is possible.
The inner surface 211a of the case upper part 211 and the inner surface 212a of the case back part 212 are formed flat (see FIG. 5). The outer surface 211b of the case upper part 211 and the outer surface 212b of the case back part 212 are also formed flat.
Further, a first locking portion 214 is formed at the rear edge portion of the opening 215 of the case back inner surface 212a, and a second locking portion 213 is formed at the front edge portion of the opening 215 of the case upper inner surface 211a. (See FIG. 4).
Since the antenna case 21 is made of a resin material, the above-described structure can be easily realized by resin molding.

The guide plate 22 and the guide base 23 are integrally configured by insert molding, for example.
The guide plate 22 has upright walls 221 and 221 formed in a U-shaped cross section by sheet metal processing, for example, and a hanging wall 222 (see FIG. 4) formed in an L-shaped cross section in the lower part. Yes. The hanging wall 222 serves as a terminal portion for transmitting a signal received by the antenna rod 10 to the circuit board.
Bearing holes 221 a and 221 a for supporting the swing shafts 321 and 321 of the swing shaft fitting 32 are formed in the standing walls 221 and 221. The bearing holes 221a and 221a are, for example, elliptical having a longer diameter than the swinging shafts 321 and 321 in the vertical direction or circular having a diameter larger than the swinging shafts 321 and 321. It is designed to be loosely fitted. That is, when the antenna rod 10 is tightened, the antenna mounting portion 30 moves upward until the swing shafts 321 and 321 come into contact with the inner peripheral upper portions of the bearing holes 221a and 221a, and when the antenna rod 10 is loosened, the swing shafts 321 and 321 are moved. The antenna mounting portion 30 moves downward until it contacts the lower inner periphery of the bearing holes 221a and 221a.
When the antenna rod 10 is completely tightened, the upper surface of the antenna mounting portion 30 (the flat portion 311 of the inner case 31) protrudes from the standing walls 221 and 221 or is flush with the standing walls 221 and 221. It has become.

  The guide base 23 has an arc-shaped base 233, and the antenna mounting portion 30 is placed on the base 233. Further, a recess 231 is formed on the peripheral surface of the guide base 23, and a waterproof rubber 24 is fitted into the recess 231. The waterproof rubber 24 prevents water that has entered from the opening 215 of the antenna case 21 from leaking to the circuit board side. The invading water is guided by a drain groove 234 formed in the base 233 and drained from a drain hole 216 formed in the case back portion 212 of the antenna case 21 (see FIG. 4).

When assembling the antenna device 1, as shown in FIGS. 3 and 4, the retaining metal fitting 33 is disposed on the lower surface of the swing shaft metal fitting 32 and is inserted into the space above the stepped portion 316 of the inner case 31. The insertion holes 314 and 315, the through screw hole 322, and the retaining hole 331 are arranged coaxially. At this time, the swing shafts 321 and 321 of the swing shaft fitting 32 are exposed from the openings on both sides of the inner case 31.
When the antenna mounting portion 30 is fitted between the standing walls 221 of the guide plate 22, the swing shafts 321 and 321 of the swing shaft fitting 32 are pivotally installed in the bearing holes 221a and 221a. In this state, the screw 25 is inserted into the insertion hole 232 of the guide base 23, and the guide base 23 is screwed onto the antenna case 21.

Then, the antenna rod 10 is inserted through the opening 215 of the antenna case 21 and screwed to the antenna mounting portion 30 (the swing shaft fitting 32). Specifically, by pushing the antenna rod 10, the flange 122 of the shaft 12 is press-fitted into the retaining hole 331 while elastically deforming the internal teeth 331 a, and then the threaded portion 121 of the shaft 12 is passed through the swinging shaft fitting 32. Screw into the screw hole 322.
At this time, the antenna mounting portion 30 is configured such that the rear convex portion 313 of the inner case 31 is locked to the first locking portion 214 of the antenna case 21 and the rotation is stopped, or the front convex portion 312 of the inner case 31 is Since the rotation is stopped by being locked by the second locking portion 213 of the antenna case 21, the insertion holes 314, 315, the through screw hole 322 and the retaining hole 331 are always within the range of the opening 215. Become. Therefore, it becomes possible to easily attach the antenna rod 10 to the antenna attachment portion 30.
A signal received by the antenna rod 10 is output to a circuit board (not shown) through a signal transmission path including the shaft 12, the swing shaft metal fitting 32, and the guide plate 22.

As described above, in the antenna device 1, the antenna attachment portion 30 includes the substantially cylindrical case member (inner case) 31 having the insertion port 314 of the shaft 12 on the peripheral surface, and the through screw hole 322 coaxial with the insertion port 314. An oscillating shaft member (oscillating shaft bracket) 32 having an oscillating shaft pivoted on the antenna base 20 (guide plate 22) and a retaining member (detaching) having a retaining hole 331 for restricting the insertion direction of the shaft 12. Fasteners) 33.
Then, the swing shaft member 32 and the retaining member 33 are accommodated in the case member 31, and the flange 122 is retained in the retaining hole 331 in a state where the insertion port 314, the through screw hole 322 and the retaining hole 331 are arranged coaxially. The screw part 121 is screwed into the through screw hole 322.

FIG. 4 is a view showing a longitudinal section passing through the central axis in the front-rear direction when the antenna rod is fastened in an upright state, and FIG. 5 is a view showing a longitudinal section passing through an axis displaced in parallel from the central axis.
As shown in FIGS. 4 and 5, when the antenna rod 10 is tightened in the standing state, the antenna mounting portion 30 moves upward along with this, and the base end surface 111 of the antenna rod 10 and the flat portions 311 and 311 of the inner case 31 are moved. The case upper portion 211 of the antenna case 21 is pinched and positioned in a standing state.
At this time, since the case upper inner surface 211a of the antenna case 21 is formed flat, the flat portions 311 and 311 of the inner case 31 and the case upper inner surface 211a are in surface contact, and a stable standing state is maintained. Further, since the case upper outer surface 211b of the antenna case 21 is formed flat, the base end surface 111 of the antenna rod 10 and the case upper outer surface 211b come into surface contact, and the stability of the standing state is further improved.

FIG. 6 is a view showing a longitudinal section passing through the central axis in the front-rear direction when the antenna rod is loosened in an upright state, and FIG. 7 is a view showing a longitudinal section passing through an axis shifted parallel to the central axis.
As shown in FIGS. 6 and 7, when the antenna rod 10 is loosened in an upright state, the antenna mounting portion 30 can be moved downward accordingly. That is, since the flat portions 311 and 311 of the inner case 31 and the base end surface 111 of the antenna rod 10 are separated from the case upper portion 211 of the antenna case 21 and the positioning state is released, the antenna rod 10 tilts backward along the opening 215. become able to.
At this time, even if the antenna rod 10 is loosened too much, the flange 122 is caught by the internal teeth 331a, so that the antenna rod 10 does not come off. Accordingly, it is possible to easily prevent the antenna rod 10 from dropping or being stolen.

When the antenna rod 10 is in the standing state, the antenna rod 10 is rotated forward while being loosened. At this time, the rear protrusion 313 of the inner case 31 is locked to the first locking portion 214 of the antenna case 21 so that the antenna rod 10 does not tilt forward from the standing state, and the rotation is stopped. Yes.
Therefore, it is possible to avoid the antenna rod 10 from being tilted more than necessary and colliding with the front edge of the opening 215 of the antenna case 21, so that it is possible to prevent the antenna case 21 from being damaged by the load accompanying the collision of the antenna rod 10. .

FIG. 8 is a view showing a vertical cross section passing through an axis parallel to the longitudinal center axis when the antenna rod 10 is loosened to be in a backward state, and FIG. 9 is when the antenna rod 10 is fastened in a backward state. It is a figure which shows the longitudinal cross section which passes along the axis | shaft which shifted | deviated in parallel from the center axis | shaft of the front-back direction. FIG. 8 is a view showing a longitudinal section that passes through the central axis in the front-rear direction when the antenna rod is in the rearward state. In FIG. 8, the antenna rod 10 is omitted.
When the antenna rod 10 is tilted backward from the state shown in FIGS. 6 and 7, the state shown in FIG. 8 is obtained. As shown in FIG. 8, when the antenna rod 10 is in the rearward state, the antenna rod 10 is rotated backward while being loosened. At this time, as shown in FIG. 10, the front convex portion 312 of the inner case 31 is locked to the second locking portion 213 of the antenna case 21 so that the antenna rod 10 does not tilt backward from the rearward tilted state. Has been stopped.
Accordingly, it is possible to avoid the antenna rod 10 from being tilted more than necessary and colliding with the rear edge of the opening 215 of the antenna case 21, so that it is possible to prevent the antenna case 21 from being damaged by the load accompanying the collision of the antenna rod 10. .

As shown in FIG. 9, when the antenna rod 10 is tightened in the rearward state, the antenna mounting portion 30 is moved upward along with this, and the antenna is formed between the base end surface 111 of the antenna rod 10 and the flat portions 311 and 311 of the inner case 31. The case back portion 212 of the case 21 is held and positioning in the rearward state is performed.
At this time, since the case back portion inner surface 212a of the antenna case 21 is formed flat, the flat portions 311 and 311 of the inner case 31 and the case back portion inner surface 212a come into surface contact, and a stable rearward state is maintained. . In addition, since the case back outer surface 212b of the antenna case 21 is formed flat, the base end surface 111 of the antenna rod 10 and the case back outer surface 212b come into surface contact, and the stability in the rearward state is further improved.

Thus, in the antenna device 1 of the present embodiment, the antenna mounting portion 30 (inner case 31) has the flat portions 311 and 311 in the vicinity of the connection portion of the antenna rod 10 (the insertion hole 314 of the inner case 31). Yes. The antenna base 20 (antenna case 21) includes a first flat portion (inner case upper surface) 211a that comes into contact with the flat portions 311 and 311 in an upright state in which the antenna rod 10 is erected, and a tilt after the antenna rod 10 is moved backward. It has the 2nd flat part (case back part inner surface) 212a contact | abutted with the flat parts 311 and 311 in a state. Then, by holding the first flat portion 211a or the second flat portion 212a between the base end surface 111 of the antenna rod 10 and the flat portions 311 and 311, the upright state or the backward state is maintained.
As a result, the antenna rod 10 can be easily positioned and fixed in two stages, a standing state and a backward state. Further, since the antenna device 1 is realized with a simple structure, the manufacturing cost can be significantly reduced.

  As mentioned above, although the invention made by this inventor was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.

  In the embodiment, the flat portions 311 and 311 are formed on both end edges of the upper peripheral surface of the inner case 31 with the insertion holes 314 interposed therebetween. However, the flat portions may be formed in the vicinity of the insertion holes 314. For example, the flat portion may be formed so as to surround the insertion hole 314 by flattening a part of the peripheral surface of the inner case 31 or forming a flat portion protruding from the peripheral surface.

  In the embodiment, the front convex portion 312 and the rear convex portion 313 are formed at a predetermined angle apart from each other at a substantially central position in the axial direction at the lower part of the circumferential surface of the inner case 31, and the front convex portion 312 is formed on the antenna case 21. The rear protruding portion 313 is locked by the first locking portion 214, but the number, position, shape, and size thereof may be changed as appropriate. Can do.

Further, when the design of the appearance is more important than the stability of the antenna rod 10 in the fixed state, the case upper outer surface 211b and the case back outer surface 212b of the antenna case 21 may not be formed flat. Even in this case, the flat portions 311 and 311 of the inner case 31 are in contact with the case upper inner surface 211a or the case back inner surface 212a, so that the standing state and the rearward state of the antenna rod 10 are stably maintained.
Furthermore, the inner case 31 is preferably made of a resin material from the viewpoint of easy molding, but can also be made of a metal material (for example, zinc die cast, brass), a ceramic material, or other materials.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Antenna apparatus 10 Antenna rod 11 Antenna cover 111 Base end surface 12 Shaft 121 Screw part 122 Flange 20 Antenna base 21 Antenna case 211 Case upper part 211a Case upper inner surface (1st flat part)
211b Case upper outer surface 212 Case back portion 212a Case back inner surface (second flat portion)
212b Case back outer surface 213 Second locking portion 214 First locking portion 215 Opening 216 Drain hole 22 Guide plate 221 Standing wall 221a Bearing hole 222 Suspended wall 23 Guide base 231 Recess 232 Insertion hole 233 Base 234 Drain groove 24 Waterproof Rubber 25 Screw 26 Base plate 30 Antenna mounting part 31 Inner case (case member)
311 Flat part 312 Front convex part 313 Back convex part 314 Insertion hole 315 Insertion hole 316 Step part 32 Oscillation shaft metal fitting (oscillation shaft member)
321 Oscillating shaft 322 Through screw hole 33 Retaining bracket (Retaining member)
331 Retaining hole 331a Internal tooth 40 Wiring 41 Power supply cable 42 Signal output cable

Claims (6)

An antenna rod, an antenna mounting portion to which a base end side of the antenna rod is connected, and an antenna base that houses the antenna mounting portion so as to be swingable therein, and the antenna rod connected to the antenna mounting portion includes: In the antenna device that extends to the outside through the opening formed in the antenna base and can be tilted in the front-rear direction,
The antenna mounting portion has a flat portion in the vicinity of the connection portion of the antenna rod,
The antenna base has a first flat portion that comes into contact with the flat portion when the antenna rod stands up and a second flat portion that comes into contact with the flat portion when the antenna rod tilts backward. ,
The antenna device, wherein the standing state or the backward state is maintained by sandwiching the first flat portion or the second flat portion between a base end surface of the antenna rod and the flat portion. The antenna mounting portion has a convex portion formed to protrude on the peripheral surface,
The antenna base locks the convex portion, and a first locking portion that stops swinging of the antenna mounting portion so that the antenna rod does not tilt after the standing state. The antenna device according to claim 1, further comprising a second locking portion that stops swinging of the antenna mounting portion so that the antenna rod does not tilt after the rearward state. The base end surface of the antenna rod is formed flat,
The antenna device according to claim 1, wherein an outer surface corresponding to the first flat portion or the second flat portion of the antenna base is formed flat.   The antenna rod is screwed to the antenna mounting portion, and the flat portion comes into contact with or separates from the first flat portion or the second flat portion according to tightening of the antenna rod. The antenna device according to any one of 1 to 3.   5. The antenna device according to claim 1, wherein the flat portion, the first flat portion, and the second flat portion are made of a resin material. The antenna rod has a shaft that protrudes from the base end surface and has a threaded portion and a flange formed thereon,
The antenna mounting portion has a substantially cylindrical case member having an insertion port for the shaft on a peripheral surface, a through screw hole coaxial with the insertion port, and a swing shaft having a swing shaft pivoted on the antenna base. A member, and a retaining member having a retaining hole that regulates the insertion direction of the shaft,
The flange member is press-fitted into the retaining hole in a state where the swing shaft member and the retaining member are accommodated in the case member, and the insertion port, the through screw hole, and the retaining hole are arranged coaxially. The antenna device according to claim 1, wherein the screw portion is screwed into the through screw hole.

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