JP2009044704A - Whip antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem that: in a double housing type whip antenna, a second-stage element is formed by spirally winding a plate-like material and made rich in flexibility, so that when the second-stage element is bent by an external force, an elastic spring mounted to a first-stage element disposed in the second-stage element is deformed, thereby decreasing sliding power or making a slide difficult, and the slide is disabled. <P>SOLUTION: A whip antenna device employs a system for increasing the strength of the elastic spring mounted to the first-stage element that slides on the inner surface of the second-stage element that is formed by spirally winding the plate-like material and can be curved, wherein a plurality of large-diameter portions are formed in the elastic spring and the large-diameter portions have projections therein. Even if the second-stage element is curved, the elastic spring positioned therein has projecting portions inside, so that the projecting portions abut on the first-stage element and prevent the plastic deformation of the elastic spring, consequently sliding stability is attained for a long period of time. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a retractable whip antenna device used for a mobile phone or a portable information terminal capable of receiving digital television broadcasts.

In the conventional retractable whip antenna device, as shown in FIGS. 8A and 8B, the first stage element portion 22 to which the elastic spring 33 is attached is a second member in which a plate-like member is closely wound helically. A retractable whip antenna device is formed so as to slide on the inner peripheral surface of the step element portion.
Then, it can be extended and stored while sliding on the inner surface of a holder (not shown) fixed to the radio housing.

  Further, as shown in FIG. 8, the second stage element portion is formed in a cylindrical shape by winding a metal plate-like member in a helical shape, and the first stage element portion is made of NiTi (nickel titanium alloy) rich in elasticity. The wire is used. In this first stage element part, a plate material rich in springiness such as BeCu (beryllium copper alloy) or phosphor bronze is formed by a press work, commonly called a lantern spring, etc., with a plurality of plate bridges with a large diameter at the center The elastic spring is secured so that it does not come off, and the large-diameter portion of the elastic spring is slidably incorporated in the inner peripheral surface of the second stage element portion with a certain frictional force.

However, since the antenna is attached to a portable wireless terminal such as a cellular phone, a force that greatly curves as shown in FIG. 9 may be applied depending on the operation.
By the way, in this case, when the elastic spring 33 is positioned near the middle of the second stage element portion as shown in FIG. 9 (a), if the second stage element portion is bent as shown in FIG. The larger diameter part of the elastic spring is compressed when the radius of curvature is smaller, and the larger one is stretched, which causes plastic deformation, which causes deformation of the larger diameter shape and dimensions of the initially produced elastic spring, As a result, the sliding force may be extremely reduced, or there may be an accident that the sliding cannot be performed.

  As a countermeasure technique for this, an improvement technique for preventing deformation of the large-diameter portion of the elastic spring even when the whip antenna is greatly curved has been proposed.

  The “expandable flexible antenna” disclosed in Patent Document 1 is a case where a resin reinforcing tube 29 is inserted into the sliding elastic piece 9 and the whip antenna is curved as shown in FIG. This is a technique for protecting the sliding elastic piece.

Japanese Patent Laid-Open No. 7-273519

However, in this method of the conventional example, it is necessary to attach a resin-like reinforcing tube to the first stage element portion and to attach an elastic spring on the first stage element portion, which not only increases the number of parts. As a result, the assembly process of parts on the production line increases, which is not economical.
In addition, an elastic spring pressed with a plate material such as beryllium copper must be attached to the first stage element portion so that the reinforcing tube is positioned inside by opening the mating surface, and workability is poor and uneconomical. It was.

The present invention has been made to solve the technical problems as described above, and the object of the present invention is to create a structure that prevents plastic deformation as much as possible in the elastic spring itself. The present invention relates to the creation of a technique in which even if the portion 55 is curved, the elastic spring 33 located in the curved portion is made strong against bending and hardly deformed.
Accordingly, it is an object of the present invention to provide a telescopic whip antenna device that can obtain a stable sliding force without increasing the number of components.

  For this purpose, the whip antenna device to which the present invention is applied is an extendable and retractable antenna element that is retained by being held in a radio housing, and is formed by winding a plate-like member in a spiral shape. A two-stage element portion is formed, and an elastic spring is mounted inside the second-stage element portion so that the elastic spring is secured to the lower end portion and is slid onto the inner peripheral surface of the second-stage element portion. The first-stage element portion is disposed, and the elastic spring is formed by forming an inner protrusion portion inward in the vicinity of the large diameter portion.

  Here, the inner protrusion provided toward the inner side of the elastic spring may be characterized by being formed in a cylindrical bottom or U-shape in the vicinity of the maximum diameter of the large-diameter portion.

  Further, the inner protrusion provided toward the inner side of the elastic spring has a diameter in which the large-diameter portion is continuous. It can be characterized by having been formed.

  Further, the protrusion provided toward the inner side of the elastic spring is formed in a cylindrical bocce shape or a U-shape toward a pair of inner sides in a portion deviated left and right from near the center of the large diameter portion. Can be characterized.

  Further, the inner protrusion of the elastic spring faces the inner diameter of the large diameter portion that is continuous toward the inside, and the continuous diameter is a flat bottom that is smaller than the maximum diameter of the large diameter portion. It can be characterized by forming.

  Further, the protrusion provided toward the inside of the elastic spring is characterized in that an arcuate portion having a curvature in the length direction from the substantially center of the large diameter portion toward the inside is formed inward. I can do it.

  The elastic spring has a cylindrical portion at both ends of the large-diameter portion and is attached to the lower end portion of the first stage element portion by a retaining ring, and is attached to each cylindrical portion on the outside. A plurality of bocchi-shaped protrusions are formed, and when the first-stage element portion is extended, the boc-shaped protrusions formed on the cylindrical portion are fixed to the upper end portion of the second-stage element portion. The elastic spring may be formed so as not to come out of the second stage element portion in contact with the small edge portion of the fastener.

A telescopic antenna element that is retained by the radio housing and is formed by winding a plate-like member in a spiral shape to form a second stage element part, and the inside of the second stage element part. The first stage element part, in which an elastic spring is secured to the lower end part, is disposed so as to slide on the inner surface of the second stage element.
The elastic spring has a large-diameter portion formed by a plurality of plate-like bridges, and the large-diameter portion cuts the vicinity of both bases of each plate-like bridge to form a slit portion, and a protruding piece formed thereby The large-diameter portion of the elastic spring together with the portion has a substantially cylindrical cross section.
Thus, an elastic spring having a high bending strength can be obtained.

  A plurality of protrusions are formed on the cylindrical portions formed at both ends of the elastic spring, and one of the protrusions is the upper end of the second stage element when the first stage antenna element is extended. It can be characterized in that it is prevented from coming off by coming into contact with the small edge portion of the clasp provided on.

According to the first aspect, the plate-like member is wound in a spiral shape, and the protruding portion is formed inwardly on the large-diameter portion of the elastic spring that slides on the inner surface of the bendable cylindrical second element portion. Therefore, even if the second stage element portion is curved by applying an external force or the like and the elastic spring is positioned therein, the tip of the protrusion formed toward the inside of the elastic spring contacts the first stage element portion. Therefore, it is difficult for plastic deformation to occur, and therefore, slidability is hardly deteriorated.
Further, the assembly workability is good without increasing the number of parts as compared with the conventional example.

  According to the second aspect of the present invention, the inner protrusion provided toward the inner side of the elastic spring is a cylindrical bottom or U-shaped protrusion directed inward in the vicinity of the maximum diameter of the large-diameter portion. It is easy to form, and even if it is bent by an external force, the elastic spring is difficult to be plastically deformed.

According to the third aspect, since the large-diameter portion of the elastic spring has a portion having a constant diameter with continuous outer dimensions, the slidability of the second stage element portion is stable.
In addition, since the inner protrusion of the elastic spring is formed in a cylindrical bocce shape or U-shape from the approximate center of the constant large diameter portion to the inside, there is little risk of deformation even if curved. Since the outer dimensions have a constant diameter, a stable sliding force can be obtained even in long-term use.

  According to the fourth aspect, the pair of inner protrusions are provided symmetrically off the vicinity of the maximum diameter of the large diameter portion of the elastic spring, and the inner protrusions are formed in a cylindrical bocce shape or U shape facing inward. Not only can the sliding force be prevented from being lowered because it is formed, but since the pair of left and right projections are provided, even when the second stage element is strongly curved, the pair of projections abut against the first stage element. The elastic spring can be more resistant to deformation, and the inner protrusion is not provided in the vicinity of the maximum diameter at the center of the large-diameter portion, so that an effect that the sliding force can be set more firmly can be expected.

  According to the fifth aspect of the present invention, the elastic spring is formed with the concave portion having the same dimension for a certain length with the substantially center of the large-diameter portion facing inward, so even when the second stage element portion is curved, Since the concave portion of the elastic spring located inside contacts the first stage element portion with a certain length, it is possible to have a more stable bending strength and to obtain a longer slidable life. There is.

  According to the sixth aspect of the present invention, since the concave portion is formed by bending the vicinity of the large diameter portion of the elastic spring toward the inside with a certain curvature, the second stage element portion is positioned inside even if it is curved. Since the large diameter part of the elastic spring has an arc shape facing inward, even if the curved portion abuts on the first stage element portion, the abutment force is dispersed in an arc shape, so that plastic deformation is difficult and stable. Sliding force is obtained.

  According to claim 7, since the cylindrical part surrounding the circumference of the first stage element part is provided on the left and right of the large diameter part of the elastic spring, and the plurality of protrusions are formed on the cylindrical part toward the outside. Since the protrusion comes into contact with the small edge portion of the fastener fixed to the upper end portion of the second stage element portion, the elastic spring does not come out of the second element portion. In addition, since the left and right cylindrical parts are provided with protrusions, the elastic spring can be inserted from either side when there is no restriction in the mounting direction of the first stage element part when the antenna is assembled at the factory. The number of parts can be reduced by removing one point of the ring, and the processing cost can be reduced by the ease of assembly.

  According to the seventh aspect, a portion near the base of the large-diameter portion of the elastic spring is partially cut, and the plate-like piece portion is formed in the large-diameter portion of the elastic member, and this portion is formed in a substantially cylindrical shape. Due to the cylindrical elastic spring, it is possible to produce an elastic spring that is strong against bending force and is difficult to deform. Thereby, even if the second stage element portion is curved, and there is an elastic spring in the curved portion, it is deformed by this. It is possible to provide a telescopic whip antenna that is a strong elastic spring with few occurrences and that has smooth sliding properties and can withstand long-term use.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 to FIG. 6 are diagrams for explaining the whip antenna device according to the first embodiment.
As shown in FIGS. 1A and 1B, the holder 15 is inserted into the holder mounting hole of the resin-made wireless device housing 13 and fixed with a nut (not shown). A leaf spring 12 is provided on the inner diameter portion of the holder 15, and the whip antenna slides and expands and contracts.
In the present whip antenna, an elastic wire 2b using a NiTi alloy or the like and a first stage element part 2 are formed by covering the outer periphery with a first stage element part covering tube 2a made of resin.

A top portion 1 is attached to the front end of the first stage element portion 2 so as not to be detached, and a retaining ring 4 is firmly fixed to the opposite end portion with hexagonal caulking or the like. Thus, the elastic spring 3 is prevented from coming off from the first stage element portion 2.
In addition, cylindrical portions 3 a and 3 a are formed at both ends of the elastic spring 3, and the inner surfaces thereof are mounted so as to hold the elastic wire 2 b of the first stage element portion 2.

A plurality of outward projections 3c, 3c are formed on the cylindrical portions 3a, 3a at the upper and lower ends of the elastic spring 3, and the second step element portion 5 is formed when the first step element portion 2 is extended. Is attached to the small edge portion 6a of the fastener 6 provided on the upper portion of the metal plate and is prevented from coming off.
Further, since the projections 3c and 3c are provided on the cylindrical portions 3a and 3a, respectively, the first stage element portion 2 may be inserted from either side during assembly at the factory. Improvement of efficiency is achieved.
In addition, about the part to which the elastic spring 3 of the 1st step element part 2 is mounted | worn, since the said 1st step element part covering tube 2a is removed, there is no problem about the electrical conductivity as an antenna.

On the other hand, the spiral part 5a formed by densely winding a plate-like material having a spring property in a spiral shape has a second-stage element part 5 formed by mounting a second-stage element part-coated tube 5b on the outer periphery thereof.
The first stage element section 2 is incorporated in the inner peripheral surface of the second stage element section 5, and the sliding force is maintained by the elastic spring 3 attached to the first stage element section 2. Yes.

  And the fastener 6 which formed the small edge part 6a is being fixed to the upper end part of the said 2nd stage element part 5 by drawing, punching, or adhesives, etc., and the 1st stage element part 2 is made into a top part When the pin 1 is picked up and stretched, the projection 3c of the elastic spring 3 comes into contact with the small edge portion 6a of the fastener 6 so as to be prevented from coming off.

On the other hand, a metal hinge portion 7 has a hinge plate-like portion 7 a and a pin hole 7 b at the lower end portion of the second stage element portion 5 and is rotatably supported by the sleeve 8 and the support shaft 9. .
A rod 10 and a coil spring 11 are arranged inside the sleeve 8, and the rod 10 is pressed against the end face of the hinge plate-like portion 7a by this spring force. Can be controlled.
A stopper 14 that is larger in diameter than the sleeve 8 and that prevents the whip antenna from being pulled out is attached to the lower end portion of the sleeve 8.

In such an antenna configuration, the elastic spring 3 is formed with a large-diameter portion 3b by three to four plate bridges, and the large-diameter portion 3b is an inner periphery of the second stage element portion 5. The surface can be slid with an appropriate spring pressure.
The large-diameter portions 3b are each formed with an inner protrusion 3d facing inward.
Therefore, when the second stage element portion 2 is bent by an external force, even when the elastic spring 3 is positioned within the curve, the inner protrusion 3d provided on the large diameter portion 3b is formed on the elastic wire 2b. Since the contact is restricted and the deformation beyond a certain deformation is regulated, the sliding force is hardly lowered due to plastic deformation, and thus a stable sliding force of the whip antenna that can withstand long-term use can be ensured.

2 to 6 show various embodiments of the elastic spring 3 shown in FIG.
Basically, the same reference numerals are the same description, and therefore duplicate description may be omitted.
The material is a plate material such as beryllium copper or phosphor bronze, which is called BeCu, and this is formed by pressing to form slits and plate-like bridges, and cylindrical portions are formed on the left and right, and projections facing outward are formed here. A plurality are formed.
This is formed into a state generally called a lantern spring with a cylindrical shape.

FIG. 2 shows the embodiment of the elastic spring 3 shown in FIG. 1 more clearly.
2A is a sectional view, and FIG. 2B is a plan view.
Inner protrusions 3d are formed on the large diameter portions 3b of the elastic springs 3 toward the inside.
FIG. 2C is a cross-sectional view of another embodiment, and FIG. 2D is a plan view thereof.
In this case, the inner protrusion 3d was recessed in a U shape in the large-diameter portion 3b of the plate bridge.
Therefore, since these inner projections 3d are provided toward the inner side which is the elastic wire 2b side, even if the second stage element portion 5 is bent into a curve by an external force, it is located in the elastic spring 3 The inner protruding portion 3d abuts against the elastic wire 2b to suppress deformation as much as possible, and the sliding force can be stabilized for a long time.

FIGS. 3A and 3B show another embodiment. FIGS. 3A and 3B show that the large-diameter portion 3b has a constant outer dimension portion, and an inner protrusion 3d is formed at a substantially central portion thereof.
3 (c) and 3 (d), the large-diameter portion 3b similarly has a constant outer dimension portion, and a U-shaped inner protrusion portion 3d is formed at a substantially central portion thereof.
Therefore, since the contact area of the elastic spring 3 that slides with the inner surface of the second stage element portion 5 is large, not only a stable sliding force can be obtained, but also a stable slidability can be obtained for long-term use. There are advantages.

FIG. 4 also shows another embodiment of the elastic spring 3.
4A is a front sectional view, and FIG. 4B is a plan view.
According to this, the pair of inner protrusions 3d and 3d are formed at positions shifted by the same dimension from the vicinity of the center point of the large diameter portion 3b of the elastic spring 3 to the left and right.
4 (c) and 4 (d), a pair of U-shaped inner protrusions 3d are formed at positions shifted from the vicinity of the center point of the large-diameter portion 3b by the same dimension to the left and right.
Therefore, the maximum outer shape portion of the large diameter portion 3b is designed to generate the maximum sliding force as an elastic spring, and a pair of inner protrusions 3d and 3d are provided at positions away from the center of the elastic spring. Even if the second stage element portion is bent and the elastic spring 3 in the second step portion is deformed, two inner protrusions are formed on the left and right, Since the two protrusions abut on the elastic wire 2b, there is little risk of deformation of the elastic spring, and long-life slidability can be ensured.

FIG. 5 is also an embodiment of the elastic spring 4.
An approximately middle portion of the large-diameter portion 3b is set as an inner protrusion 3m facing inward, and only the inner protrusion 3b is formed with a small diameter on the inner side by this fixed dimension.
In this case, even if the second stage element portion 5 is curved and the elastic spring 3 located in the second stage element portion may be deformed, the contact with the elastic wire 2b is not changed from the previous point to the line. Since contact is possible and deformation is less likely to occur, a sliding force can be stably obtained over a long period of time.

FIG. 6 is also an example of the elastic spring 3.
6A is a sectional view and FIG. 6B is a plan view.
The elastic spring 3 is formed with a radius of curvature R with the substantially central portion of the large diameter portion 3b facing inward.
Therefore, since the projecting portion directed inward is formed with a radius of curvature, when the second stage element portion 5 is curved, the elastic spring 3 located inside the projecting portion is an inner projection due to the radius of curvature. The elastic spring 3 is not easily deformed even when a large bending force is applied.

[Second Embodiment]
(A) of FIG. 7 is the figure made into the partial cross section figure regarding the retractable whip antenna apparatus which concerns on 2nd Embodiment, (b) is the figure seen from the XX cross section of (a) figure. is there.
In the present embodiment, the same reference numerals are used for the same components as those in the first embodiment, and the description thereof may be omitted.
A fastener 6 having a small edge portion 6a is fixed to the distal end portion of the second stage element portion 5 including the spiral portion 5a and the second stage element portion covering tube 5b attached to the outer periphery thereof.

On the other hand, the top part 1 is fixed to the first stage element part 2, and the first stage element part covering tube is removed on the opposite side to expose the elastic wire 2b, and the elastic spring 3 is attached thereto. A retaining ring 4 is fixed to the lower end portion by hexagonal caulking or the like to hold the elastic spring 3 from coming off.
In this state, the second stage element portion 5 is inserted and incorporated in the second stage element portion 5, and is slid on the inner peripheral surface of the second stage element portion 5 by the elastic spring 3.
In the elastic spring 3 according to FIG. 7A, slit portions 3f and 3f are formed in the vicinity of the base end portion of the plate-like bridge portion forming the large diameter portion 3b.

As a result, a protrusion piece 3g is formed on the large-diameter portion 3b, and the large-diameter portion 3b of the elastic spring 3 is formed in a substantially cylindrical shape as can be seen in FIG. 7B.
As a result, even if a forced force such as bending is applied to the elastic spring 3, the large-diameter portion 3b of the plate-like bridge has a substantially cylindrical cross section. This increases the force that can be obtained, and is advantageous in that the large diameter portion 3b is less likely to be damaged and troubles such as a reduction in spring force are less likely to occur.

On the other hand, cylindrical portions 3a and 3a are formed at both ends of the elastic spring 3, and the first-stage element portion-covered tube 2a is removed from the lower end portion of the first-stage element portion 2 to obtain an elastic wire 2b portion. The cylindrical portion 3a of the elastic spring 3 is fitted into this portion to achieve electrical conduction.
A retaining ring 4 is attached to the lower end portion of the elastic wire 2b, and is fixed by hexagonal caulking or the like to prevent the elastic spring 3 from coming off.

Furthermore, the cylindrical portions 3a and 3a formed at both ends of the elastic spring 3 are each formed with a plurality of protrusions 3c and 3c directed outward.
As a result, when the first step element portion 2 is stretched, the cylindrical portion 3a of the elastic spring 3 comes into contact with the small edge portion 6a of the fastener 6 formed at the upper end portion of the second step element portion 5 and is prevented from coming off. The
Since each of the cylindrical portions 3a and 3a is formed with a plurality of protrusions 3c and 3c, it is not necessary to specify the assembling direction at the time of assembling and manufacturing, so that the assembling workability is good. is there.

It is the figure made into the partial cross section figure explaining the expansion-contraction type whip antenna apparatus which concerns on 1st Embodiment. It is one Example figure of an elastic spring. It is another Example figure of an elastic spring. It is another Example figure of an elastic spring. It is another Example figure of an elastic spring. It is another Example figure of an elastic spring. It is the figure made into the partial cross section figure explaining the expansion-contraction type whip antenna apparatus which concerns on 2nd Embodiment. Sectional view of a conventional telescopic whip antenna device Diagram of a conventional telescopic whip antenna bent by applying external force

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Top part 2 ... 1st step element part 2a ... 1st step element part covering tube 2b ... Elastic wire 3 ... Elastic spring 3a ... Cylindrical part 3b ... ··· Large diameter portion 3c ··· Projection 3d ··· Inner projection portion 3e ··· Matching surface 3f ··· Slit portion 3g ··· Projection piece portion 4 ··· Fastening ring 5 2nd stage element 5a ... Spiral 5b ... 2nd element covering tube 6 ... Fastener 6a ... Small edge 7 ... Hinge 7a ... Hinge plate-like part 7b ... Pin hole 8 ... Sleeve 9 ... Spindle 10 ... Rod 11 ... Coil spring 12 ... leaf spring 13 ... radio equipment casing 14 ... stopper 15 ... holder

Claims (8)

  A telescopic antenna element that is retained by a radio housing and is formed by winding a plate-like member in a spiral shape to form a cylindrical second-stage element portion. The first stage element portion having an elastic spring attached to the lower end portion thereof is disposed so as to slide on the inner surface of the second stage element portion, and the elastic spring is directed inwardly to each large diameter portion thereof. A telescopic whip antenna device characterized in that an inner protrusion is formed.   2. The whip antenna device according to claim 1, wherein the inner protrusion provided toward the inner side of the elastic spring is formed in a cylindrical bottom shape or a U-shape in the vicinity of the maximum diameter portion of the large diameter portion.   The inner protruding portion provided toward the inner side of the elastic spring has a diameter in which the large-diameter portion is continuous, and is formed in a cylindrical bocce shape or U-shape toward the inner side at a substantially central portion of the large-diameter portion. The whip antenna device according to claim 1.   The inner protrusion provided toward the inner side of the elastic spring is formed in a pair of cylindrical bottoms or U-shapes toward the inner side in a portion deviated left and right from near the center of the large diameter portion. The whip antenna device according to claim 1.   The inner protrusion provided toward the inner side of the elastic spring has a diameter portion that is continuous with the substantially center of the large-diameter portion facing inward, and the continuous diameter portion is smaller in diameter than the maximum diameter of the large-diameter portion. The whip antenna device according to claim 1.   2. The whip according to claim 1, wherein the inner protrusion provided toward the inner side of the elastic spring forms an arc-shaped portion having a radius of curvature in the length direction from substantially the center of the large diameter portion toward the inner side. Antenna device.   The elastic spring has a cylindrical portion at both ends across the large diameter portion and is attached to the lower end portion of the first stage element portion so as to be prevented from coming off, and is directed outward to each cylindrical portion. A plurality of protrusions are formed, and when the first step element portion is stretched, the protrusions formed on the cylindrical portion are in contact with the small edge portion of the fastener fixed to the upper end portion of the second step element portion. The whip antenna device according to any one of claims 1 to 6, wherein the whip antenna device is configured to be prevented from coming off.     A telescopic antenna element that is retained by a radio housing and is formed by winding a plate-like member in a spiral shape to form a cylindrical second-stage element portion. Is provided with a first stage element portion having a resilient spring secured to the lower end portion so as to slide on the inner surface of the second stage element, and the elastic spring is a plurality of plate-like bridges having a large diameter. Part is formed, the large diameter part forms a slit part near both bases of each plate-like bridge, and the cross section is formed in a substantially cylindrical shape together with the projecting piece part formed thereby, The cylindrical part formed at both ends of the elastic spring has a plurality of outward projections, and when the first stage antenna element is stretched, the projections are provided at the upper end of the second stage element part. Abuts against the small edge of the bracket Characterized in that it is retained by Rukoto, telescopic whip antenna device.

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