JP2012039466A - Portable radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable radio device which attempts to make a housing thin while having high antenna performance and housing rigidness.SOLUTION: A metal plate 11 of the size to cover a whole housing in a plane is used and the metal plate 11 is integrally formed with a housing 10. This makes it possible to obtain housing rigidness. Also, a slit 20 is formed in the metal plate 11 to make a high potential part 11a in the metal plate 11, and the high potential part 11a is an antenna element. An input output end 13a of a radio circuit part 13 positioned on the circuit board 12 through a ground-removed part 12b obtained by removing the ground patterns at points overlapped on the high potential part 11a of the metal plate 11 of the ground patterns 12a of the circuit board 12 and the antenna element which is the high potential part 11a are connected, and the ground pattern 12a of the circuit board 12 and the ground part 11b which is a position other than the high potential part 11a of the metal plate 11 are connected. Thus, an antenna element with good radiation efficiency can be configured.

Description

  The present invention relates to a portable wireless device such as a mobile phone, and more particularly to a portable wireless device in which an antenna is integrated with a casing.

  As the portable radio device described above, for example, those described in Patent Documents 1 to 3 are known. The portable radio telephone described in Patent Document 1 has a frame shape between opposing faces around the opening surface of a back case that houses a functional circuit of the portable radio telephone and a front case that covers the back case. A waterproof packing is disposed, and an antenna element is embedded in the waterproof packing. The portable terminal described in Patent Document 2 forms an antenna element integrally with a casing. The wireless terminal described in Patent Document 3 has an antenna that is integrated with a waterproof case inside the housing and exposed inside the prevention case.

Japanese Patent Application Laid-Open No. 6-037876 JP 2006-129038 A JP 2009-267895 A

  By the way, in a portable radio device such as a mobile phone, there is a great demand for thinning from the viewpoint of design and the like, and it is important to ensure both thinning and ensuring strength, and securing antenna performance in a state where they are secured. However, there is no conventional portable wireless device that achieves both high antenna performance and casing rigidity while reducing the thickness of the casing.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a portable wireless device that achieves both high antenna performance and housing rigidity while reducing the thickness of the housing.

  A portable wireless device of the present invention includes a non-conductive casing, a metal plate inserted into the casing and integrally formed, a circuit board that is disposed in close proximity to the metal plate and has a ground pattern, and A wireless circuit unit disposed on the circuit board, and the metal plate is a size that covers the entire casing in a plane, and the metal plate has a small area on the metal plate. There is a slit to create, the ground pattern of the circuit board, the region or the portion overlapping the slit is removed, the region and the radio circuit unit are connected, the region outside the region of the metal plate and the region A ground pattern is connected, and the region is used as an antenna element.

  According to the above configuration, since a metal plate having a size covering the entire casing in a plane is used and the metal plate is formed integrally with the casing, the casing rigidity can be obtained. Of course, since a metal plate for increasing the rigidity of the casing is used, the casing can be thinned.

  Moreover, a slit was formed in the metal plate to create a small area in the metal plate, and this region was used as an antenna element. Then, of the ground pattern of the circuit board, the ground pattern is removed from the portion of the metal plate that overlaps the region or the slit, and the antenna element formed on the metal circuit plate and the wireless circuit unit arranged on the circuit board through the removed ground pattern In addition, the ground pattern that has not been removed and a portion other than the antenna element formation region of the metal plate are connected. Thereby, an antenna with good radiation efficiency such as an inverted F antenna or a loop antenna can be configured.

  In the above configuration, the region and the wireless circuit unit are connected at the open end of the slit.

  According to the above configuration, the region as the antenna element can be operated as a loop antenna.

  A portable wireless device of the present invention includes a non-conductive casing, a metal plate inserted into the casing and integrally formed, a circuit board that is disposed in close proximity to the metal plate and has a ground pattern, and A wireless circuit unit disposed on the circuit board, and the metal plate is a size that covers the entire casing in a plane, and the metal plate has a small area on the metal plate. There is a slot to be created, and the ground pattern is removed from the circuit board at a location overlapping the area or the slot, and the substantially central portion of the area is connected to the radio circuit section, and the outside of the metal plate is outside the area. And the ground pattern are connected, and the region is used as an antenna element.

  According to the above configuration, since a metal plate having a size covering the entire casing in a plane is used and the metal plate is formed integrally with the casing, the casing rigidity can be obtained. Of course, since a metal plate for increasing the rigidity of the casing is used, the casing can be thinned.

  In addition, a slot was formed in the metal plate to create a small area in the metal plate, and this region was used as an antenna element. Then, of the ground pattern on the circuit board, the ground pattern is removed from the portion overlapping the region or slot of the metal plate, and the radio circuit portion disposed on the circuit board and the antenna element formed on the metal plate through the removed ground pattern In addition, the ground pattern that has not been removed and a portion other than the antenna element formation region of the metal plate are connected. Thereby, an antenna with good radiation efficiency such as a merged loop antenna can be configured. Further, since the slot does not have an open end like a slit, the strength can be increased as compared with the slit.

  The said structure WHEREIN: The waterproof wall which prevents the penetration | invasion to the inner side of water was provided so that the said area | region of the said metal plate might be straddled planarly.

  According to the above configuration, water can be prevented from entering the area where the circuit board is provided, and waterproofness can be ensured.

  The said structure WHEREIN: The radiation element was provided in the position which overlaps with a part of said metal plate of the outer side of the said waterproof wall planarly.

  According to the above configuration, the radiating element and a part of the metal plate are capacitively coupled and operate as an antenna including the radiating element. By providing the radiating element, a wide band can be achieved.

  According to the present invention, in a portable wireless device in which an antenna is integrated with a housing, it is possible to achieve both high antenna performance and housing rigidity while reducing the thickness of the housing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the portable radio | wireless machine which concerns on Embodiment 1 of this invention, The figure (a) is a top view, The figure (b) is sectional drawing. The figure which shows the space | interval of the circuit board and metal plate in the portable radio | wireless machine of FIG. The figure which shows the equivalent structure of the antenna of the portable radio | wireless machine of FIG. FIG. 3 is a plan view showing a schematic configuration of a portable wireless device according to the second embodiment of the present invention. The figure which shows the equivalent structure of the antenna of the portable radio | wireless machine of FIG. It is a schematic block diagram of the portable radio | wireless machine which concerns on Embodiment 3 of this invention, The figure (a) is a top view, The figure (b) is sectional drawing. The figure which shows the equivalent structure of the antenna of the portable radio | wireless machine of FIG. It is a schematic block diagram of the portable radio | wireless machine which concerns on Embodiment 4 of this invention, The figure (a) is a top view, The figure (b) is sectional drawing. It is a schematic block diagram of the portable radio | wireless machine which concerns on Embodiment 5 of this invention, The figure (a) is a top view, The figure (b) is sectional drawing.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

(Embodiment 1)
1A and 1B are schematic configuration diagrams of a portable wireless device according to Embodiment 1 of the present invention, where FIG. 1A is a plan view and FIG. 1B is a cross-sectional view. In FIG. 1, the portable wireless device 1 according to the present embodiment includes a non-conductive housing 10, a metal plate 11 that is inserted into the housing 10 and integrally formed, and is disposed in parallel with the metal plate 11. The circuit board 12 having a ground pattern, a wireless circuit unit 13 disposed on the circuit board 12, and a liquid crystal display (LCD) 14 are provided.

  The housing 10 is composed of two housing cases 10A and 10B each formed in a square shape. The housing case 10A is formed in a U-shaped cross section having a wall portion 10A1 along its peripheral edge. The housing case 10B is formed in the same size as the housing case 10A, and a holding portion 10B1 for holding the metal plate 11 is formed along the peripheral edge portion thereof. The holding part 10B1 is obtained by folding the peripheral part of the housing case 10B inward, and holds the metal plate 11 by fitting the peripheral part of the metal plate 11. The housing cases 10A and 10B are connected such that the front end surface of the wall portion 10A1 of the housing case 10A is in contact with the surface of the housing case 10B opposite to the holding portion 10B1. A circuit board 12 is attached to the surface of the housing case 10B opposite to the holding portion 10B1.

  The metal plate 11 is attached to the housing case 10B by fitting the peripheral portion of the metal plate 11 to the holding portion 10B1. A liquid crystal display 14 is attached to the housing case 10B. The distance between the circuit board 12 and the metal plate 11 is, for example, 0.3 mm as shown in FIG. In this case, the thickness of the circuit board 12 is 0.6 mm, and the thickness of the metal plate 11 is 0.4 mm.

  The metal plate 11 is formed in a size that covers substantially the entire case 10 in a planar manner. In addition, the metal plate 11 is formed with a slit 20 in the upper right corner to create a substantially L-shaped small-area high-potential portion (region having a small area in the metal plate 11) 11a. The high potential portion 11 a of the metal plate 11 has an upper end portion (upward portion in the drawing) protruding above the other portion of the upper end of the metal plate 11. The slit 20 has an open end at one end (upper end in the drawing) 20a. A portion having a large area other than the high potential portion 11a of the metal plate 11 becomes a ground portion 11b.

  On the circuit board 12, a ground pattern 12a is formed on substantially the entire surface on the side where the wireless circuit unit 13 is provided. However, the ground pattern is removed from the portion overlapping the high potential portion 11a of the metal plate 11. In addition, you may remove the ground pattern of the location which overlaps with the slit 20 formed in the metal plate 11 of the circuit board 12. FIG. Here, the portion of the circuit board 12 from which the ground pattern has been removed is referred to as a ground removal portion 12b. The input / output end 13a of the wireless circuit unit 13 disposed on the circuit board 12 is connected to the high potential unit 11a of the metal plate 11 through the grounded portion 12b. The connection point is a feeding point 30.

  Further, the ground pattern 12 a of the circuit board 12 is connected to the ground portion 11 b of the metal plate 11 adjacent to the ground-extracted portion 12 b. The connection point becomes a short-circuit point 31. In this way, the input / output end 13a of the wireless circuit unit 13 is connected to the high potential unit 11a of the metal plate 11 at the feeding point 30 on the high potential unit 11a of the metal plate 11, and the ground pattern 12a of the circuit board 12 is connected to the metal plate. 11 is connected to the ground portion 11b of the metal plate 11 at a location below the high potential portion 11a. Thereby, the high potential part 11a of the metal plate 11 operates as an inverted F antenna. FIG. 3 is a diagram illustrating an equivalent configuration of the antenna of the portable wireless device 1 according to the present embodiment. In the portable wireless device 1 of the present embodiment, a part of the metal plate 11 operates as an inverted F antenna.

  As described above, according to the portable wireless device 1 of the present embodiment, the metal plate 11 having a size covering the entire case in plan is used, and the metal plate 11 is integrally formed with the case 10. Stiffness is obtained. In addition, the slit 20 is formed in the metal plate 11, the high potential portion 11 a is created in the metal plate 11, the high potential portion 11 a is used as an antenna element, and the high potential portion of the metal plate 11 in the ground pattern 12 a of the circuit board 12. The input / output end 13a of the wireless circuit unit 13 arranged on the circuit board 12 is connected to the antenna element which is the high potential unit 11a through the ground-extracted portion 12b obtained by removing the ground pattern at the portion overlapping the 11a or the slit 20. In addition, since the ground pattern 12a of the circuit board 12 and the ground part 11b other than the high potential part 11a of the metal plate 11 are connected, an antenna element with good radiation efficiency can be configured. Therefore, both high antenna performance and housing rigidity can be achieved. Of course, since the metal plate for increasing the rigidity of the casing is used, the casing can be thinned.

(Embodiment 2)
FIG. 4 is a plan view showing a schematic configuration of the portable wireless device according to the second embodiment of the present invention. In FIG. 4, the same reference numerals are given to the portions common to FIG. 1 described above.

  In FIG. 4, the portable wireless device 2 of the present embodiment is provided with a feeding point 30 on the open end 50 a side of the slit 50 formed in the metal plate 11, and the wireless circuit unit 13 on the circuit board 12 is provided at the feeding point 30. The input / output terminal 13a is connected. The slit 50 formed in the metal plate 11 is substantially L-shaped like the shape of the slit 20 in the first embodiment described above, and is formed in the upper right corner portion of the metal plate 11. The difference from the slit 20 in the first embodiment is that the open end is the side surface side of the metal plate 11 (right side surface as viewed in the drawing). The short-circuit point 31 is disposed adjacent to the open end 50 a of the slit 50, and the ground pattern 12 a of the circuit board 12 and the ground portion 11 b of the metal plate 11 are connected at the short-circuit point 31.

  By forming the slit 50 in the metal plate 11 and creating the high potential portion 11a having a small area in the metal plate 11, the high potential portion 11a operates as an antenna element. FIG. 5 is a diagram illustrating an equivalent configuration of the antenna of the portable wireless device 2 according to the present embodiment. As shown in FIG. 5, in this embodiment, the antenna element operates as a loop antenna by providing the feeding point 30 on the open end 50 a side of the slit 50. As described above, an antenna element with good radiation efficiency can be configured as in the portable wireless device 1 of the first embodiment described above. Of course, since the metal plate 11 is used, the rigidity of the casing can be obtained and the casing can be thinned.

(Embodiment 3)
6A and 6B are schematic configuration diagrams of a portable wireless device according to the third embodiment of the present invention, where FIG. 6A is a plan view and FIG. 6B is a cross-sectional view. In FIG. 6, the same reference numerals are given to the portions common to FIG.

  In FIG. 6, the portable wireless device 3 according to the present embodiment includes a metal plate 11 instead of the slits 20 and 50 employed in the portable wireless device 1 of the first embodiment and the portable wireless device 2 of the second embodiment. A slot 60 is provided in the upper portion, the metal plate 11 is divided into a high potential portion 11c having a small area and a ground portion 11d having a large area, and a feeding point 30 is provided in the vicinity of the approximate center of the high potential portion 11c. The wireless circuit unit 13 is connected to the input / output terminal 13a.

  The slot 60 is a hole formed in the metal plate 11, and is formed in a rectangular shape having a recess 60a in the center. The feeding point 30 is disposed in the recess 60a of the slot 60, and the short-circuit points 31a and 31b are disposed adjacent to the left and right ends, respectively. By providing the slot 60 in the metal plate 11, as in the case where the metal plate 11 is provided with a slit, a part of the metal plate 11 can be used as the high potential portion 11c and the remaining portion can be used as the ground portion 11d. The high potential portion 11c operates as an antenna element. FIG. 7 is a diagram showing an equivalent configuration of the antenna of the portable wireless device 3 of the present embodiment. As shown in FIG. 7, the antenna element of the present embodiment operates as a merged loop antenna.

  Thus, the portable radio device 3 of the present embodiment can also configure an antenna element with good radiation efficiency, similar to the portable radio devices 1 and 2 of the first and second embodiments. Of course, since the metal plate 11 is used, the rigidity of the casing can be obtained and the casing can be thinned. In particular, since the slot 60 does not have an open end like the slits 20 and 50, the strength can be increased as compared with the slits 20 and 50. That is, the slot 60 is easy to give rigidity.

(Embodiment 4)
FIG. 8 is a schematic configuration diagram of a portable wireless device according to the fourth embodiment of the present invention, where FIG. 8A is a plan view and FIG. 8B is a cross-sectional view. In FIG. 8, the same reference numerals are given to the portions common to FIG.

  In FIG. 8, the portable wireless device 4 of the present embodiment has a waterproof wall that prevents water from entering the area where the circuit board 12 is arranged, in addition to the same configuration as the portable wireless device 1 of the first embodiment described above. 70. The waterproof wall 70 is formed in a frame shape having an I-shaped cross section, and is provided so as to straddle the high potential portion 11a of the metal plate 11 in a planar manner. One end surface of the waterproof wall 70 is in close contact with the inner surface of the housing case 10 </ b> A of the housing 10, and the other end surface thereof is in close contact with the back surface of the housing case 10 </ b> B of the housing 10, thereby arranging the circuit board 12. Prevent water from entering the area. As described above, the waterproof wall 70 can prevent water from entering the region where the circuit board 12 is disposed, and can ensure waterproofness.

(Embodiment 5)
FIG. 9 is a schematic configuration diagram of a portable wireless device according to the fifth embodiment of the present invention, where FIG. 9A is a plan view and FIG. 9B is a cross-sectional view. In FIG. 9, the same reference numerals are given to the portions common to FIG. 8 described above.

  In FIG. 9, the portable wireless device 5 of the present embodiment has a radiating element 80 for increasing the bandwidth in addition to the same configuration as the portable wireless device 4 of the fourth embodiment described above. The radiating element 80 is disposed outside the waterproof wall 70 at a position overlapping the metal plate 11 in a planar manner. In the present embodiment, it is provided immediately above the slit 20 formed in the metal plate 11. The radiating element 80 is capacitively coupled to a part of the metal plate 11 by being fed from the radio circuit unit 13 to the high potential portion 11a of the metal plate 11 as an antenna element, so that the size of the antenna can be increased. Further, since the radiating element 80 is not directly connected to the circuit board 12, waterproofing is not required. In this way, by providing the radiation element 80 at a position that overlaps a part of the metal plate 11 outside the waterproof wall 70 in a planar manner, a broad band can be achieved.

  INDUSTRIAL APPLICABILITY The present invention has an effect that it is possible to achieve both high antenna performance and casing rigidity while reducing the thickness of the casing of a portable wireless device, and can be applied to a portable wireless device such as a mobile phone. is there.

1, 2, 3, 4, 5 Portable wireless device 10 Case 10A, 10B Case 10A1 Wall portion 10B1 Holding portion 11 Metal plate 11a, 11c High potential portion 11b, 11d Ground portion 12 Circuit board 12a Ground pattern 12b Ground removal Part 13 Radio circuit unit 13a Input / output terminal 14 Liquid crystal display 20, 50 Slit 30 Feed point 31 Short-circuit point 60 Slot 70 Waterproof wall 80 Radiating element

Claims (5)

A non-conductive housing;
A metal plate inserted into the housing and integrally formed;
A circuit board disposed near and parallel to the metal plate and having a ground pattern;
A wireless circuit unit disposed on the circuit board,
The metal plate is a size that covers the entire casing in a plane,
The metal plate has a slit that creates a small area in the metal plate,
The ground pattern of the circuit board where the region or the portion overlapping the slit is removed,
The region and the wireless circuit unit are connected,
A location outside the region of the metal plate and the ground pattern are connected,
A portable radio using the area as an antenna element.   The portable wireless device according to claim 1, wherein the area and the wireless circuit unit are connected at an open end of the slit. A non-conductive housing;
A metal plate inserted into the housing and integrally formed;
A circuit board disposed near and parallel to the metal plate and having a ground pattern;
A wireless circuit unit disposed on the circuit board,
The metal plate is a size that covers the entire casing in a plane,
The metal plate has a slot that creates a small area in the metal plate,
The ground pattern of the circuit board, where the region or the portion overlapping the slot is removed,
The substantially central portion of the region and the wireless circuit portion are connected,
A location outside the region of the metal plate and the ground pattern are connected,
A portable radio using the area as an antenna element.   The portable wireless device according to any one of claims 1 to 3, wherein a waterproof wall that prevents water from entering inside is provided so as to straddle the region of the metal plate in a planar manner.   The portable wireless device according to claim 4, wherein a radiating element is provided at a position overlapping a part of the metal plate outside the waterproof wall in a plane.

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