JP2008017356A - Antenna for portable device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, in the conventional antenna wherein a coil part is constituted of two stages for shortening a full length, an antenna case for housing the antenna requires an approximately half length of the full length of the antenna even in a contracted state, so that when mounting the antenna in a small-sized device, downsizing of the device is necessarily disturbed for securing the space for housing the antenna. <P>SOLUTION: The present invention relates to techniques for an antenna including a folding part for freely folding an antenna body in the intermediate portion of the antenna body, wherein a tip end side antenna body portion from a position folded at the folding part can be housed in a groove-like housing part provided to the side face of an electronic device case. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna for a portable device.

Conventionally, in order to shorten the overall length of the antenna, a technique for configuring the antenna body in a two-stage configuration has already been proposed (see, for example, Patent Document 1). At this time, as shown in FIG. 1, the two-stage antenna main body is disposed substantially on one axis and has a sheath structure. Note that (A-1) and (A-2) show a state where the antenna body is shortened, and (B-1) and (B-2) show a state where the antenna body is extended. is there.
JP 2003-338707 A

  However, in the invention described in Patent Document 1, even when the antenna main body is divided into two parts and shortened, the space for housing the antenna requires about half the total length of the antenna. At this time, when an antenna is mounted on a small electronic device, there is a possibility that the total length of the antenna may be limited depending on the vertical or horizontal length of the electronic device. Moreover, in order to ensure the space which accommodates an antenna, the subject that size reduction of electronic equipment itself may be prevented inevitably arises.

  2 and 3 show conventional electronic devices equipped with antennas. 2 is a perspective view of the electronic device as viewed from the front side, and FIG. 3 is a perspective view of the electronic device as viewed from the back side. FIG. 3A illustrates a state in which the antenna is extended, and FIG. 3B illustrates a state in which the antenna is shortened and housed in the housing of the electronic device. Here, when the antenna is stored in a uniaxial state, the total length of the antenna is the maximum length L of the electronic device (2L when the antenna is configured in two stages), and the total length of the antenna is Limits arise.

  In view of such circumstances, the present invention proposes a technique related to an antenna having a bent portion that allows the antenna body to be bent at an intermediate portion of the antenna body. In addition, the antenna is arranged on the base side with a first stage antenna portion having a sheath structure, and is arranged on the front end side, and all or / and a predetermined part of the first stage antenna portion with respect to the sheath structure is stored and pulled out. It may be composed of a flexible second stage antenna portion. At this time, it is good also as having the 2nd bending part which makes the antenna main body bendable in the root part of an antenna main body. Furthermore, the antenna main body portion on the front end side from the position bent at the first bent portion can be stored in a groove-shaped storage portion provided on the side surface of the electronic device casing.

  As described above, the antenna according to the present invention can be shortened in the total length by the sheath structure, and further, the antenna main body can be bent to be along the side surface of the casing. Even if an electronic device including an antenna is small, a space for storing the antenna can be secured.

  The best mode for carrying out each invention will be described below. The relationship between each embodiment and the claims is as follows. The first embodiment will mainly describe claims 1, 5, 8, and 9. The second embodiment will mainly describe claims 2 and 6. The third embodiment will mainly describe Claims 3, 4, and 7. The fourth embodiment will mainly describe claims 10, 11, and 12. Note that the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the spirit of the present invention.

  << Embodiment 1 >>

  <Embodiment 1: Overview> An overview of the present embodiment will be described. The present embodiment is an antenna characterized by having a first bent portion that allows the antenna body to be bent at an intermediate portion of the antenna body.

  FIG. 4 shows an example of the antenna of this embodiment. (A) shows a state where the antenna is shortened, and (B) and (C) show a state where the antenna is extended. Further, (D) shows a state where the antenna is bent from the middle portion. In addition, the numerical value in a figure shows the size of each part, and a unit is mm.

  The “first bent portion” refers to a bent joint portion. The direction and angle for bending the antenna are not limited to those shown in the figure. FIG. 5 shows an example of the structure of the bent portion. For example, the angle of the antenna can be adjusted by 0 to 180 degrees by a mechanism in which the heel portion tilts back and forth (a), and the direction can be adjusted by 0 to 360 degrees by a mechanism by which the base portion rotates. (B) It is desirable that the direction and angle of the antenna can be freely changed according to the radio wave reception state. In the present embodiment, it is not essential that the antenna body has a sheath structure, but as shown in the figure, the antenna portion that is the inner side of the nesting is narrowed toward the upper end, thereby forming a double structure. The antenna can be extended and contracted.

  Radio waves received by the antenna widely include analog broadcasting, BS broadcasting, CS broadcasting, terrestrial digital broadcasting (one-segment broadcasting), terrestrial digital radio broadcasting, and the like. In the folded state, it is convenient that reception itself is possible although the radio wave quality is expected to deteriorate. In general, an antenna needs to have a length corresponding to a quarter wavelength of a radio wave. However, by satisfying this in both a stretched state and a bent state, it is possible to always receive a radio wave regardless of the state of the antenna. It becomes.

  Further, it is assumed that a feeding point is provided at the lowermost end of the antenna, and the antenna and the feeding point are in a conductive state. At this time, the first bent portion may be configured to have a reception function in the entire antenna body in the bent state. For this purpose, it is essential that electricity is conducted before and after the bent portion. This can be realized by the fact that the antenna main body is made of metal or that the two-stage antennas are in contact before and after the bent portion.

  Moreover, as shown in FIG. 6, the antenna may have a plurality of first bent portions. The figure is an example of a bending method. As shown to (A) and (B), you may bend only in a part of bending part, and you may bend in a several bending part as shown in (C). Further, (D) shows a view of one antenna seen from the side and a view seen from above, but it may be bent three-dimensionally in this way.

  It is assumed that these antennas are provided in an electronic device as shown in FIG. The size shown in the figure is an example. However, when the antenna is accommodated in the vertical direction of the electronic device, the total length of the antenna needs to be about 8 cm (16 cm when the two-stage configuration is used). However, when the size of the electronic device is small, in this embodiment, it is possible to secure a space for storing the antenna by bending the antenna at an intermediate portion so as to be along the casing of the electronic device. This will be described in detail in a later embodiment.

  <Embodiment 1: Effect> The antenna of the present embodiment has a first bent portion that allows the antenna main body to be bent at an intermediate portion of the main body. Thereby, even if the electronic device provided with the antenna is small, a space for housing the antenna can be ensured by bending the antenna along the side surface of the housing.

  << Embodiment 2 >>

  <Embodiment 2: Overview> An overview of the present embodiment will be described. In the present embodiment, the first stage antenna portion having a sheath structure disposed on the base side of the antenna body, and all or / and a predetermined amount with respect to the sheath structure of the first stage antenna section disposed on the distal end side of the antenna body. It is an antenna characterized by comprising a part of the second stage antenna part that can be stored and pulled out.

  <Embodiment 2: Configuration> FIG. 8 shows an example of the configuration of the present embodiment. (A) and (B) are states in which the antenna is extended, and (C) is a state in which the antenna in the extended state indicated by a solid line is partially shortened and bent in dotted lines. . The antenna of this embodiment shown in FIG. 8 has a “first bent portion” (0801), a “first stage antenna portion” (0802), and a “second stage antenna portion” (0803).

  The “first bent portion” (0801) is provided so that the antenna body can be bent at an intermediate portion of the antenna body. As in the case already described with reference to FIG. 5, it is convenient that the folding direction and the angle can be freely changed according to the reception state of the radio wave. In addition, the bent portion is provided in a first stage antenna portion (0802) described later.

  The “first stage antenna portion” (0802) is disposed on the root side and has a sheath structure. All or / and a predetermined part of the second stage antenna can be accommodated in the sheath portion. It is assumed that a feeding point is provided at the lowermost end of the antenna, and the antenna and the feeding point are in a conductive state.

  The “second stage antenna portion” (0803) is arranged on the front end side, and has a structure in which all or / and a predetermined part of the first stage antenna portion (0802) can be stored and pulled out. Yes. A state in which a predetermined part of the second stage antenna portion is housed in the sheath structure of the first stage antenna portion is indicated by a dotted line in FIG. Even when the second-stage antenna portion is inserted into the first-stage antenna portion, the upper end still protrudes without being fully stored. For example, in a state where all the antennas are pulled out, a predetermined part (24 mm) is stored as an antenna corresponding to terrestrial digital broadcasting (one segment), and the other part is projected, and terrestrial digital radio broadcasting (three segments) is accommodated. ) Is assumed to be usable in two forms. It is assumed that the second stage antenna portion is not housed below the first bent portion.

  Further, it is assumed that a feeding point is provided at the lowermost end of the antenna, and the antenna and the feeding point are in a conductive state. This does not change even when all or a predetermined part of the second stage antenna part is accommodated in the sheath structure of the first stage antenna part. At this time, the first stage antenna part and the other second stage antenna parts that are not housed in a state where all or a predetermined part of the second stage antenna part is housed in the first stage antenna part as a whole It may be configured to have a reception function. For this purpose, it is essential that the first stage antenna part and the other second stage antenna part not housed are electrically connected. This is achieved by the fact that the antenna body is made of metal, and that the first stage antenna part and the second stage antenna part (including the second stage antenna part protruding without being able to be stored) are in contact with each other. Is possible.

  Further, as in the first embodiment, the antenna may have a plurality of first bent portions. These antennas are assumed to be provided in electronic equipment. Even if it is a small electronic device, a space for storing a longer antenna is secured by folding the antenna in a sheath structure while folding it and folding it at the bent part along the casing of the electronic device. be able to.

  <Embodiment 2: Effect> The antenna according to the present embodiment includes a first stage antenna portion having a sheath structure disposed on the root side and a sheath structure of the first stage antenna portion disposed on the distal end side. Alternatively, and / or a second stage antenna part that is capable of storing and extracting a predetermined part can be provided. As a result, the antenna is further shortened, so that it is easy to equip a small electronic device.

  << Embodiment 3 >>

  <Embodiment 3: Overview> An overview of the present embodiment will be described. The present embodiment is an antenna characterized by having a second bent portion that allows the antenna body to be bent at the base portion of the antenna body.

  <Embodiment 3: Configuration> FIG. 9 shows an example of the configuration of the present embodiment. (A) and (B) are states in which the antenna is extended, and (C) is a state in which the antenna in the extended state indicated by a solid line is partially shortened and bent in dotted lines. . The antenna of this embodiment shown in FIG. 9 includes a “first bent portion” (0901), a “first stage antenna portion” (0902), a “second stage antenna portion” (0903), and “ Second bent portion "(0904).

  The “second bent portion” (0904) is provided so that the antenna body can be bent at the base portion of the antenna body. As in the case already described with reference to FIG. 5, it is convenient that the folding direction and the angle can be freely changed according to the reception state of the radio wave. Further, as shown in FIG. 10, the first bent portion and the second bent portion are different in the bending direction by 90 degrees when viewed from the antenna axis center line direction. For example, the second bent portion bends in (A) forward direction, (B) back direction, (C) left direction, and (D) right direction.

  Further, it is assumed that a feeding point is provided at the lowermost end of the antenna, and the antenna and the feeding point are in a conductive state. At this time, the second bent portion is configured to have a reception function in the entire antenna body in a bent state. For this purpose, it is essential that electricity is conducted before and after the bent portion. This is realizable because the antenna body is made of metal or the antennas are in contact before and after the bent portion.

  10 to 13 are diagrams illustrating an electronic device including an antenna. 10 shows the electronic device as viewed from the front side, and FIGS. 11 to 13 as viewed from the back side. FIG. 11 shows a state in which the antenna is extended, and FIG. 12 shows a state in which the antenna is partially contracted (24 mm). FIG. 13 shows a state where the antenna is shortened and housed in an electronic device. The radio waves received by the antenna are terrestrial digital broadcasting (one seg), terrestrial digital radio broadcasting, etc., but can be used as an antenna corresponding to one seg when the antenna is most extended (FIGS. 10 and 11), and is 24 mm. It can be used as an antenna compatible with digital terrestrial radio broadcasting (3 segments) in a contracted state (FIG. 12).

  Further, as in the first embodiment, the antenna may have a plurality of first bent portions. These antennas are assumed to be provided in electronic equipment. As shown in FIG. 14, a space for housing the antenna can be ensured by bending the antenna and placing it along the casing of the electronic device. The other processes are the same as those in the second embodiment.

  <Embodiment 3: Effect> The antenna of the present embodiment is characterized in that it has a second bent portion that allows the antenna body to be bent at the base portion of the antenna body. Thereby, it becomes easy to place the antenna along the side surface of the housing by bending the antenna. Even if an electronic device including an antenna is small, a space for storing the antenna can be secured.

  << Embodiment 4 >>

  <Embodiment 4: Overview> An overview of the present embodiment will be described. The electronic device according to the present embodiment is characterized in that the antenna main body portion on the distal end side is stored in a groove-shaped storage portion provided on the side surface of the electronic device casing from the position bent at the first bending portion. .

  <Embodiment 4: Configuration> FIG. 15 shows an example of the configuration of the present embodiment. The electronic apparatus of the present embodiment illustrated in FIG. 15 includes a “first storage unit” (1501). Furthermore, a “second storage portion” (1502) may be provided.

  The “first storage portion” (1501) stores all or a part of the antenna body so as to be capable of being pushed and pulled in the antenna axial direction. It exists inside the electronic device and is indicated by a dotted line in FIG. At least the first stage antenna portion is housed in the first housing portion, and at the same time, the second stage antenna portion housed in the sheath structure of the first stage antenna portion is also housed. At this time, it is assumed that a feeding point is provided at the lower end of the first storage unit. Regardless of the state of the antenna body (when extended, shortened, bent), the antenna contacts the feed point.

  The “second storage portion” (1502) stores the antenna body portion on the distal end side from the position bent at the first bent portion. The antenna main body portion on the front end side from the position bent at the first bent portion, that is, the second stage antenna portion.

  In addition, the second storage unit may be configured by a groove-shaped storage unit provided on the side surface of the electronic device casing. FIG. 13 illustrates a state in which the second stage antenna portion is housed in the groove-shaped housing portion.

  In addition, the antenna can receive radio waves regardless of whether the antenna is stored in the first storage unit or the second storage unit. At this time, the casing of the electronic device itself is preferably made of a material that is not metal.

  <Embodiment 4: Effect> In the antenna of this embodiment, the antenna body portion on the distal end side is stored in a groove-shaped storage portion provided on the side surface of the electronic device casing from the position bent at the first bending portion. It has the feature to do. Thereby, even if the electronic device provided with the antenna is small, a space for housing the antenna can be secured.

Structure of conventional antenna The figure which showed an example of the electronic device (surface) provided with the conventional antenna The figure which showed an example of the electronic device (back surface) provided with the conventional antenna Structure diagram of antenna of embodiment 1 The figure which showed an example of the structure of a bent part The figure which showed an example of the antenna which has two or more bending parts FIG. 6 is a diagram illustrating an example of an electronic device including the antenna according to the first embodiment. Structure diagram of antenna of embodiment 2 Structure diagram of antenna of embodiment 3 The figure which showed an example of the electronic device (surface) provided with the antenna of Embodiment 3 The figure which showed an example of the electronic device (back surface, antenna expansion | extension state) provided with the antenna of Embodiment 3. The figure which showed an example of the electronic device (back surface, antenna shortened state) provided with the antenna of Embodiment 3. The figure which showed the electronic device (an example of a back surface and antenna accommodation state) provided with the antenna of Embodiment 3. Diagram showing variations of antenna and electronic equipment Structure diagram of electronic device of embodiment 4

Explanation of symbols

0801 First bent part 0802 First stage antenna part 0803 Second stage antenna part

Claims (12)

  The antenna which has the 1st bending part which makes the antenna main body bendable in the intermediate part of an antenna main body.   The antenna main body is arranged on the base side of the first stage antenna portion having a sheath structure, and the sheath structure of the first stage antenna portion is arranged at the front end side so that all or / and a predetermined part of the antenna body can be retracted. The antenna according to claim 1, further comprising a second stage antenna portion, wherein the bent portion is provided in the first stage antenna portion.   The antenna of Claim 1 or 2 which has a 2nd bending part which makes the antenna main body bendable in the root part of an antenna main body.   The antenna according to claim 3, wherein the first bent portion and the second bent portion are different from each other in bending direction by 90 degrees when viewed from the antenna axis center line direction.   The antenna according to claim 1, wherein the first bent portion is configured to have a reception function in the entire antenna body in a bent state.   The first stage antenna part and the other second stage antenna parts that are not housed in a state where all or a predetermined part of the second stage antenna part is housed in the first stage antenna part have a reception function as a whole. The antenna according to claim 2, wherein the antenna is configured to have.   The antenna according to claim 4, wherein the second bent portion is configured to have a reception function in the entire antenna body in a bent state.   The antenna according to claim 1, wherein the antenna has a plurality of first bent portions.   The electronic device provided with the antenna as described in any one of Claim 1 to 8.   The electronic device according to claim 9, further comprising a first storage portion that stores all or a part of the antenna body so as to be capable of being pushed and pulled in the antenna axis direction.   The electronic device according to claim 10, further comprising a second storage portion that stores the antenna main body portion on the distal end side from a position bent at the first bent portion.   The electronic device according to claim 11, wherein the second storage portion is a groove-shaped storage portion provided on a side surface of the electronic device casing.

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