JP2014060490A - Portable radio and manufacturing method for portable radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable radio having excellent transmission/reception performance.SOLUTION: A portable radio 40 has an integrated structure where a substrate and a battery are housed in one structure. The portable radio 40 includes a housing having a housing earth, a display, an antenna 11 for wireless transmission/reception performing wireless transmission/reception, flexible substrates 4, 5 performing operation control of the portable radio, and a GND flexible substrate 6 provided with a GND pattern by extending the flexible substrates 4, 5 planarly. An exciting current of the antenna 11 for wireless transmission/reception is fed to the housing earth via the GND flexible substrate 6.

Description

  The present invention relates to a portable wireless device and a method for manufacturing the portable wireless device.

  In recent years, a portable wireless device called a tablet type in which a substrate and a battery are housed in one structure has been used.

  FIG. 3 is a diagram showing an internal structure of a general tablet-type portable wireless device. The portable wireless device 41 includes a front panel 21 and a back casing 27.

  The front panel 21 includes an LCD (Liquid Crystal Display) panel 22, a metal bezel 23, an LCD signal flexible substrate 24, and an LCD backlight signal flexible substrate 25.

  The LCD panel 22 is provided on the back side of the front panel 21. The metal bezel 23 is provided so as to border the periphery of the LCD panel 22. Each of the LCD signal flexible substrate 24 and the LCD backlight signal flexible substrate 25 is electrically connected to the main substrate 30.

  The back casing 27 includes a metal frame 28, a main board 30, a radio transmission / reception antenna 31, a matching circuit board 32, and a radio circuit 33.

  The back casing 27 incorporates a metal frame 28. The metal frame 28 has a hole for accommodating a battery. The main substrate 30 is a printed circuit board provided on the back casing 27 and is electrically connected to the LCD signal flexible substrate 24 and the LCD backlight signal flexible substrate 25. The radio circuit 33 is provided on the main board 30. The radio transmission / reception antenna 31 is connected to the radio circuit 33 via a matching circuit board 32 by a coaxial cable. Wireless signals can be transmitted and received via the wireless transmission / reception antenna 31.

  When the portable wireless device 41 is a product that has been assembled, the metal frame 28 and the back portion of the LCD panel 22 are overlapped and closed.

  Here, FIG. 4 is a schematic diagram of the antenna ground shape viewed from the radio transmission / reception antenna 31 during assembly. In FIG. 4, a wavy line portion is a place that can be regarded as a housing ground 35.

  Patent Document 1 discloses an invention relating to a wireless communication device that is downsized while maintaining antenna performance.

  Patent Document 2 discloses a technique relating to a portable wireless terminal in which a casing length is variable and a ground connection is reliably established between a plurality of casings.

  Patent Document 3 discloses a technique for improving antenna performance in a foldable portable wireless device configured by connecting two housings so as to be freely opened and closed without significantly changing the external shape.

JP 2009-130468 A JP 2006-148517 A JP 2010-045698 A

  In the portable wireless device 41, the ground shape in the vicinity of the antenna is only the frame of the metal frame 28 as shown in FIG. Therefore, since the path through which the antenna excitation current flows to the housing ground is limited to only a thin frame frame, there is a problem that leads to deterioration of antenna characteristics. As a countermeasure here, as shown in FIG. 5, a method of covering the battery installation part with a surface by making the metal frame into a bathtub-like structure can be considered, but there is a disadvantage that the casing becomes thick is there. Therefore, a portable wireless device that exhibits excellent transmission / reception performance without increasing the thickness of the housing has been desired.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a portable radio having excellent transmission / reception performance.

A portable wireless device according to the present invention is an integrated portable wireless device in which a substrate and a battery are housed in a single structure, a housing having a housing ground, a display unit, and an antenna that performs wireless transmission and reception A flexible substrate that controls the operation of the portable radio device, and a GND flexible substrate that extends the flexible substrate into a planar shape and is provided with a GND pattern. The excitation current of the antenna is passed through the GND flexible substrate. It is characterized by flowing to the housing ground.
As a result, it is possible to create a state in which the excitation current from the radio transmission / reception antenna easily flows.

The method for manufacturing a portable wireless device according to the present invention includes a step of mounting a display unit on a front panel, a flexible substrate for transmitting a control signal of the display unit, and exciting current of a wireless transmission / reception antenna, Mounting on the back side of the display unit, and combining the front panel and the back housing.
As a result, it is possible to create a state in which the excitation current from the radio transmission / reception antenna easily flows.

  According to the present invention, it is possible to provide a portable radio having excellent transmission / reception performance.

1 is a diagram illustrating an internal structure of a portable wireless device according to a first embodiment. 1 is a schematic diagram of a ground shape of a portable wireless device according to a first embodiment; It is a figure which shows the internal structure of the portable radio | wireless machine concerning related technology. It is the schematic of the earth | ground shape of the portable radio | wireless machine concerning related technology. It is a figure which shows the structure at the time of changing the metal frame shape of the portable radio device concerning related technology.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the internal structure of the portable wireless device 40.

  The portable wireless device 40 includes a front panel 1 and a back casing 7.

  The front panel 1 includes an LCD panel 2, a metal bezel 3, an LCD signal flexible substrate 4, and an LCD backlight signal flexible substrate 5.

  The LCD panel 2 is a display unit having a display panel using liquid crystal. Typically, the LCD panel 2 performs display using reflected light in a bright place and displays using backlight light in a dark place.

  The metal bezel 3 is provided so as to border the periphery of the LCD panel 2. The metal bezel 3 is electrically connected to a GND flexible substrate 6 that is connected to the LCD backlight signal flexible substrate 5.

  The LCD signal flexible substrate 4 is a flexible printed substrate for a display unit provided on the front panel 1. Typically, the LCD signal flexible substrate 4 is provided so as to overlap the LCD panel 2 in the thickness direction of the housing. The LCD signal flexible substrate 4 transmits an electrical signal (LCD signal) for controlling display contents displayed on the LCD panel 2. The LCD signal flexible substrate 4 is electrically connected to the main substrate 10.

  The LCD backlight signal flexible substrate 5 is a flexible printed substrate for a display unit provided on the front panel 1. Typically, the LCD backlight signal flexible substrate 5 is provided so as to overlap the LCD panel 2 in the thickness direction of the housing. For example, the LCD backlight signal flexible substrate 5 transmits an electrical signal related to ON / OFF control of the backlight of the LCD panel 2. The LCD backlight signal flexible substrate 5 is electrically connected to the main substrate 10. The LCD backlight signal flexible substrate 5 includes a GND flexible substrate 6.

  The GND flexible substrate 6 is a flexible printed circuit board in which a GND pattern is greatly developed. For example, the GND flexible substrate 6 is configured to be integrated with the side surface portion of the LCD backlight signal flexible substrate 5 at the side surface portion on the LCD backlight signal flexible substrate 5 side.

  The GND flexible substrate 6 may have either a single-sided structure or a double-sided structure. In the case of the single-sided structure, for example, a GND pattern made of a metal foil such as a copper foil is formed on a polyimide base material, and the surface is covered with a coverlay.

  A part of the front surface of the GND flexible substrate 6 on the LCD panel 2 side is provided with a front electrode connected to the GND pattern. The front electrode is electrically connected to the metal bezel 3. The front electrode has, for example, a shape along a part of the shape of the metal bezel 3.

  In addition, a part of the back side of the GND flexible substrate 6 is provided with a back electrode connected to the GND pattern. When the back electrode is combined with the front panel 1 and the back housing 7, the back electrode is electrically connected to the metal frame 8 of the back housing 7. The back electrode has, for example, a shape along a part of the shape of the metal frame 8.

  As described above, the GND flexible substrate 6 has the GND pattern electrically connected to the metal bezel 3 and the metal frame 8 of the back casing 7. More specifically, the GND flexible substrate 6 is obtained by extending a part of the LCD backlight signal flexible substrate 5 into a planar shape and providing a GND pattern portion. Used as 11 ground. Typically, the GND flexible substrate 6 has at least a part of the expanded GND pattern in a hole portion of the metal frame 8 of the back case 7 when the front panel 1 and the back case 7 are combined. On the other hand, it arrange | positions so that it may be in the state with the lid | cover by overlapping in three dimensions.

  The back casing 7 includes a metal frame 8, a main board 10, a radio transmission / reception antenna 11, a matching circuit board 12, and a radio circuit 13.

  The metal frame 8 is a frame built in the back housing 7 in order to maintain the strength of the back housing 7. The metal frame 8 has a hole for accommodating the rectangular battery 9. When the product has been assembled, the metal frame 8 and the back portion of the LCD panel 2 are stacked and assembled so as to close the spread. At this time, the metal frame 8, the LCD metal bezel 3 and the GND flexible substrate 6 are connected in a direct current (DC) manner. At this time, each of the metal frame 8, the metal bezel 3, and the GND flexible substrate 6 can be used as a path for an excitation current flowing from the radio transmission / reception antenna 11 to the housing ground.

  The battery 9 supplies power to the portable wireless device 40.

  The main substrate 10 is a printed circuit board provided on the back casing 7. The main board 10 is electrically connected to the LCD signal flexible board 4 and the LCD backlight signal flexible board 5. The main board 10 is electrically connected to the radio transmission / reception antenna 11 via the matching circuit board 12.

  The wireless transmission / reception antenna 11 is a device that transmits and receives wireless radio waves based on instructions from the wireless circuit 13. Specifically, the radio transmission / reception antenna 11 is connected to the radio circuit 13 on the main board 10 via the matching circuit board 12. Typically, a coaxial cable 14 is used to connect the radio transmission / reception antenna 11 and the radio circuit 13.

  The matching circuit board 12 performs matching so that energy loss between the radio transmission / reception antenna 11 and the radio circuit 13 is reduced.

  The radio circuit 13 controls a signal to be put on a radio wave transmitted / received from the radio transmission / reception antenna 11. The wireless circuit 13 is connected to the wireless transmission / reception antenna 11 via the matching circuit board 12.

  The coaxial cable 14 is a covered electric wire for transmitting an electrical signal. The coaxial cable 14 transmits a signal between the radio transmission / reception antenna 11 and the radio circuit 13.

  FIG. 2 is a schematic diagram of a ground shape as seen from the wireless transmission / reception antenna 11 in the portable wireless device 40 in which the front panel 1 and the rear casing 7 are assembled. In FIG. 2, a wavy line portion is a place that can be regarded as a housing ground 15. That is, in the portable wireless device 40, the metal frame 8 and the LCD panel 2 are overlapped so that the spread is closed when the housing assembly is completed, and the GNDs are connected to each other at this time. Specifically, the GND flexible substrate 6 is in contact with the metal bezel 3 and the metal frame 8. As a result, the excitation current flows through the housing ground 15 in an abundance.

Here, the ground shape of the portable wireless device 40 shown in FIG. 2 is compared with the ground shape of the related portable wireless device 41 shown in FIG.
In the portable wireless device 41 shown in FIG. 4, the ground in the vicinity of the wireless transmission / reception antenna 31 has only two thin paths in the hole provided in the metal frame 28. On the other hand, in the portable wireless device 40 according to the embodiment shown in FIG. 2, the GND flexible substrate 6 is provided so as to cover a part of the hole of the metal frame 8. As a result, the portable wireless device 40 is in a state in which the excitation current flows as much as the housing ground 15 in the vicinity of the wireless transmission / reception antenna 11 is expanded into a planar shape.

  Therefore, by electrically connecting the metal bezel 3 of the portable radio 40 and the GND flexible substrate 6 in which the GND pattern of the LCD signal flexible substrate 4 is expanded, and connecting to the metal frame 8 provided in the vicinity of the antenna, It is possible to make it easy for an excitation current to flow through the housing ground 15.

More specifically, in the portable wireless device 40, the GND pattern area covering the back side of the LCD can be increased by expanding the GND pattern of the LCD signal flexible substrate 4 and connecting it to the metal bezel 3. Further, the portable wireless device 40 is arranged so that the increased GND pattern portion covers the hole of the metal frame 8 during assembly, thereby changing the GND shape from the frame state to the GND flexible state. The surface including the substrate 6 can be brought into a state. Thereby, in the portable wireless device 40, the antenna current is more likely to flow through the housing GND.
Therefore, it is possible to provide a portable wireless device that exhibits good electrical characteristics without increasing the thickness of the casing.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the shape of the GND flexible substrate 6 is not limited to the shape shown in FIGS. 1 and 2 as long as it increases the area of the GND pattern.

  INDUSTRIAL APPLICABILITY The present invention can be used for improving communication performance of terminals that require transmission / reception antennas in the field of communication terminals such as portable wireless devices, portable terminals, and portable wireless tablet terminals.

DESCRIPTION OF SYMBOLS 1 Front panel 2 LCD panel 3 Metal bezel 4 LCD signal flexible board 5 LCD backlight signal flexible board 6 GND flexible board 7 Back housing 8 Metal frame 9 Battery 10 Main board 11 Radio transmission / reception antenna 12 Matching circuit board 13 Radio circuit 14 Coaxial Cable 15 Chassis ground 21 Front panel 22 LCD panel 23 Metal bezel 24 LCD signal flexible board 25 LCD backlight signal flexible board 27 Rear chassis 28 Metal frame 30 Main board 31 Radio transmitting / receiving antenna 32 Matching circuit board 33 Radio circuit 35 Chassis ground 40 Portable radio 41 Portable radio

Claims (7)

A display unit;
A flexible substrate for transmitting a control signal of the display unit;
A wireless transmission / reception antenna for wireless transmission and reception;
The flexible substrate is extended into a planar shape, and provided with a GND flexible substrate provided with a GND pattern,
A portable wireless device that causes an excitation current of the wireless transmission / reception antenna to flow through the GND flexible substrate. A housing for housing the flexible substrate, the wireless transmission / reception antenna, and the GND flexible substrate;
A metal frame that reinforces the housing;
The portable wireless device according to claim 1, wherein a GND pattern of the GND flexible substrate is electrically connected to the metal frame. The housing has a front panel and a back housing,
The front panel includes the display unit, the flexible substrate, and the GND flexible substrate,
The back housing is equipped with the antenna for wireless transmission and reception and the metal frame,
The metal frame is provided with a hole for storing the battery,
The GND flexible substrate is provided at a position where at least part of the GND flexible substrate overlaps the hole when the front panel and the back casing are overlapped.
The portable wireless device according to claim 2. A metal bezel that borders the display unit;
The portable wireless device according to any one of claims 1 to 3, wherein a GND pattern of the GND flexible substrate is electrically connected to the metal bezel. The flexible substrate is
LCD signal flexible substrate for performing signal processing for display control of the display unit;
An LCD backlight signal flexible substrate that performs signal processing for controlling the backlight of the display unit,
The portable wireless device according to any one of claims 1 to 4.   The portable wireless device according to any one of claims 1 to 5, wherein the portable wireless device has an integrated structure in which a substrate and a battery are housed in one structure. Mounting the display unit on the front panel;
A step of mounting a flexible substrate for transmitting a control signal of the display unit and exciting current of the radio transmission / reception antenna on the back side of the display unit;
A method of manufacturing a portable wireless device comprising the step of combining the front panel and a rear housing.

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