JP4642643B2 - Mobile device - Google Patents

Description

  The present invention relates to a portable terminal such as a mobile phone, a PDA (Personal Digital Assistant), a digital camera, and a laptop personal computer, and in particular, electronic components such as a display device and a camera are exposed from an opening provided in a housing. It is related with the portable terminal comprised as follows.

  As a portable terminal such as a mobile phone, a PDA, a digital camera, or a notebook personal computer, a display device such as a liquid crystal display device disposed on a circuit board in an outer case (housing), and a frame surrounding the display device There is known a shield plate that is electrically connected to a ground pattern on a circuit board (for example, Patent Document 1). An opening that exposes the display device is formed in the outer case, and the opening is covered with a transparent plate from the outside of the outer case. The transparent plate is attached to the outer case at the periphery.

In this portable terminal, the static electricity that enters from between the outer case and the transparent plate is released to the ground pattern via the shield plate, thereby preventing malfunction and damage of the display device.
JP 2003-18264 A

  In recent years, in some cases, coating is performed on the periphery of the transparent plate in order to hide the peripheral portion of the opening, that is, the portion where the transparent plate is attached. For the coating, a paint mixed with metal powder or the like may be used to increase the gloss and improve the appearance. As a result, the conductivity at the periphery of the transparent plate is increased, and static electricity easily enters from between the transparent plate and the outer case.

  The object of the present invention is to form a conductive layer on the periphery of the transparent plate to prevent adverse effects of static electricity entering between the housing and the transparent plate covering the opening of the housing on electronic components such as a display device inside the housing. It is an object of the present invention to provide a portable terminal that can be reduced even when it is used.

  The portable terminal of the present invention includes a non-conductive casing having an opening, an electronic component provided in the casing and exposed from the opening, and a non-conductive transparent covering the opening from the outside of the casing. A plate, a conductive layer provided on the side of the casing of the transparent plate so as to surround the opening, and a circuit provided in the casing on the inner side of the casing and surrounding the opening. A conductive sheet electrically connected to the ground layer of the substrate, and a through hole provided in a housing wall sandwiched between the conductive layer and the conductive sheet, and electrically connecting the conductive layer and the conductive sheet And the through hole is opened at a position of an inner peripheral side edge of the conductive layer.

  Preferably, the conductor has elasticity, and is held between the conductive layer and the conductive sheet.

  Preferably, the conductor is a cylindrical body formed by winding a sheet-like member in a roll shape, and the conductor is arranged so that a radial direction of the cylindrical body faces a penetration direction of the through hole. Place in the through hole.

  Preferably, the conductive layer is a coating film having a metal film or a metal piece.

  According to the present invention, when the conductive layer is formed on the periphery of the transparent plate, adverse effects of static electricity entering between the housing and the transparent plate covering the opening of the housing on the electronic components inside the housing Can also be prevented.

  1 and 2 are external perspective views showing a mobile phone 1 according to an embodiment of the present invention. The mobile phone 1 is configured as a so-called foldable mobile phone. FIG. 1 shows an open state, and FIGS. 2A and 2B show a closed state.

  The mobile phone 1 includes a receiving case 2 and a transmitting case 3. The receiving case 2 and the transmitting case 3 are configured to form a case as the mobile phone 1 by connecting the end portions of the receiving case 2 and the transmitting case 3 with the connecting portion 4, and the mobile phone 1 includes the connecting portion 4. It can be opened and closed with the side as the center of rotation. The receiving case 2 and the transmitting case 3 are each formed in a substantially thin rectangular parallelepiped shape, and are superposed on each other in the closed state, and the outlines of the receiving case 2 and the sending case 3 substantially coincide when viewed from the other case side. It is like that.

  The receiving case 2 includes a front side case 6 on the side facing the transmitting case 3 in a closed state, and a back side case 7 on the back side. The front side case 6 and the back side case 7 are each formed of, for example, a non-conductive resin. In the front case 6 of the receiving housing 2, a sound emission port 13 of a speaker 48 for calling (see FIG. 7) is opened. The receiving case 2 is provided with a main display unit 11 for displaying images and characters on the front and a sub-display unit 12 for displaying images and characters on the back. The main display unit 11 and the sub display unit 12 include a display device such as a liquid crystal display device or an organic EL display device.

  The transmitter case 3 includes a front-side case 8 on the side facing the receiver case 2 in the closed state, a rear-side case 9 on the back side, and a lid 10 that covers the back side of the back-side case 9. It has. The front side case 8, the back side case 9, and the lid body 10 are each formed of, for example, a non-conductive resin. A sound collection port 18 of a call microphone 49 (see FIG. 7) is opened in the front case 8 of the transmitter case 3, and a sound emission port 19 of a notification speaker 50 (see FIG. 7) is opened in the lid 10. Is open. The transmitter case 3 is provided with an operation unit 17 that receives user operations. Various buttons such as a numeric keypad 17a, a cursor key 17b, and a function key 17c are arranged on the operation unit 17, and are exposed from the front side case 8.

  3 is an exploded perspective view of the receiving housing 2 as viewed from the back side (FIG. 2 (a), upper side of the drawing), and FIG. 4 is a front side (FIG. 2 (a), lower side of the drawing). FIG. However, FIGS. 3 and 4 show the receiver case 2 with various components such as the front case 6 and the main display unit 11 omitted.

  In the receiver case 2, the circuit board 21, the display device 22, the conductive sheet 23, the conductor 24 and the back side case 7, and the transparent plate 25 are stacked from the inside of the case. A conductive layer 26 (hatched portion in FIG. 4) is formed on the surface of the transparent plate 25 on the back case 7 side. Note that an elastic member (for example, sponge) for absorbing shock may be disposed between the display device 22 and the conductive sheet 23.

  The circuit board 21 is composed of, for example, a thick printed wiring board based on a resin, and a ground pattern layer 21a (only part of which is shown in FIG. 3) is formed on the surface on the display device 22 side. On the circuit board 21, various electronic circuits such as a power supply circuit for supplying power to the display device 22 and a control circuit for controlling the operation of the display device 22 include an IC (not shown).

  The display device 22 is configured by a liquid crystal display device, for example. For example, the display device 22 is formed in a substantially rectangular shape as a whole, and a display region 22a for displaying an image is also formed in a substantially rectangular shape. In the display device 22, a control circuit for applying a voltage to the liquid crystal for each pixel is housed in the center of the circuit board 21 from the display area 22a. The display device 22 is accommodated and held in a box-shaped holder 28. The holder 28 is formed of, for example, non-conductive resin or the like, and is fixed on the circuit board 21.

  A concave portion 32 for disposing the transparent plate 25 is formed on a surface of the back side case 7 facing the transparent plate 25, and an opening for exposing the display region 22a to the outside of the housing is formed at the bottom of the concave portion 32. 33 and the through hole 34 for arrange | positioning the conductor 24 are opening.

  The shape of the recess 32 is, for example, a substantially ellipse. The opening 33 opens to the approximate center of the bottom surface of the recess, and the shape and size of the opening 33 are, for example, substantially the same as the display area 22a. The through hole 34 opens to the bottom surface of the recess that forms the periphery of the opening 33. For example, it opens in the back side case 7 center side rather than the opening part 33. FIG. The through hole 34 is smaller than the opening 33.

  The conductive sheet 23 is made of a thin sheet made of copper, for example, and has conductivity. The conductive sheet 23 has an opening 23a for exposing the display area 22a of the display device 22, and the conductive sheet 23 is formed in a frame shape as a whole. The opening 23a has, for example, substantially the same shape and size as the display area 22a. The conductive sheet 23 is disposed so as to surround the opening 33 by being fixed to the outer peripheral portion 7a (FIG. 4) of the opening 33 of the inner surface of the back case 7 by a bonding means such as an adhesive sheet. The

  A projecting piece 23 b extends from the outer peripheral side of the conductive sheet 23. The projecting piece 23 b is electrically connected to the ground pattern layer 21 a of the circuit board 21 through the tab 30. That is, the conductive sheet 23 is electrically connected to the ground pattern layer 21a.

  The tab 30 may be appropriately configured with a conductive member. For example, the tab 30 is a metal spring contact protruding from the ground pattern layer 21a, and when the front side case 6 and the back side case 7 are fixed to each other, the protruding piece 23b is formed by the inner side surface of the back side case 7. By being pressed against the spring contact, the projecting piece 23b and the spring contact are connected.

  The transparent plate 25 is made of a non-conductive material having translucency such as acrylic resin. The transparent plate 25 is formed in a substantially flat plate shape that can be fitted and inserted into the concave portion 32 of the back side case 7, and the thickness thereof is substantially equal to the depth of the concave portion 32, for example. When the transparent plate 25 is fitted and inserted into the recess 32, the entire opening 33 is covered with the transparent plate 25. Thereby, the display area 22a is protected from external force, and entry of dust and moisture from the opening 33 into the interior of the receiver case 2 is also prevented.

  The conductive layer 26 is, for example, a coating film formed by applying a paint mixed with metal powder (metal piece) or the like to the transparent plate 25 or a metal film formed by evaporating metal on the transparent plate 25. Have electrical conductivity. The conductive layer 26 does not have translucency or has lower translucency than the transparent plate 25. The conductive layer 26 is formed on the surface of the transparent plate 25 on the back side case 7 side, and is formed over the entire periphery of the transparent plate 25 at the peripheral edge of the transparent plate 25.

  The shape and size of the translucent region 25a (region on the inner peripheral side from the conductive layer 26) where the conductive layer 26 is not formed are similar to the opening 33 and are formed to be slightly larger. Arranged on the display area 22 a of the device 22. Therefore, the conductive layer 26 is disposed so as to surround the opening 33. Since the opening 23a of the conductive sheet 23 is also disposed on the display region 22a, the conductive layer 26 and the conductive sheet 23 at least partially overlap in plan view. The through hole 34 is arranged in a region where the conductive layer 26 and the conductive sheet 23 overlap (a region sandwiched between the conductive layer 26 and the conductive sheet 23).

  In addition, the translucent region 25a is slightly larger than the opening 33 of the back case 7 (see FIG. 6A), and the conductive layer 26 is disposed at a position away from the edge of the opening 33 toward the outer peripheral side. Will be. The through hole 34 is located at an edge on the inner peripheral side (opening 33 side) of the conductive layer 26. On the other hand, the opening 23 a of the conductive sheet 23 is arranged to be slightly larger than the opening 33. Therefore, the through hole 34 is located on the conductive sheet 23.

  The transparent plate 25 and the rear case 7 are fixed by a joining means such as an adhesive sheet disposed between the bottom surface of the recess 32 (the surface on the transparent plate 25 side) and the conductive layer 26 of the transparent plate 25. The shape and size of the transparent region 25a of the transparent plate 25 are substantially the same as the shape and size of the opening 33, and the bottom surface of the recess 32 is mostly hidden by the conductive layer 26 when viewed from the outside of the housing. Will be.

  The conductor 24 is made of a conductive material such as metal, and has a shape and a size inserted into the through hole 34, for example. The conductor 24 is sandwiched between the conductive layer 26 and the conductive sheet 23 while being inserted into the through hole 34. Thereby, the conductor 24 is held with respect to the back side case 7 and electrically connects the conductive layer 26 and the conductive sheet 23. The conductor 24 is located on the inner peripheral side (translucent region 25 a side) of the conductive layer 26. The conductor 24 may be bonded to the conductive layer 26 or the conductive sheet 23 with solder or the like.

  5 (a) is a perspective view showing the conductor 24, FIG. 5 (b) is a perspective view showing a sheet-like member 24 'constituting the conductor 24, and FIG. 5 (c) is a sheet. It is an enlarged view of a member 24 '.

  The conductor 24 is formed by winding a conductive sheet-like member 24 'shown in FIG. 5B in the direction of the arrow y3, that is, in a roll shape (cylindrical shape) as shown in FIG. 5A. Has been. The regions 24a where the sheet-like members 24 'overlap are joined to each other by a joining means such as an adhesive sheet or solder. As shown in FIG. 5C, the sheet-like member 24 'is formed by weaving a conductive wire material 36 such as copper. The diameter of the wire rod 36 and the weaving form may be set as appropriate.

  And the conductor 24 which made the cylindrical body shown to Fig.5 (a) is arrange | positioned in the through-hole 34 so that it may be pinched | interposed into the conductive layer 26 and the conductive sheet 23 in the radial direction. The diameter D1 of the conductor 24 is larger than the depth of the through hole 34 of the back side case 7. Accordingly, when the conductor 24 is sandwiched between the conductive layer 26 and the conductive sheet 23, the conductor 24 receives a force in the direction indicated by the arrows y1 and y2 from the conductive layer 26 and the conductive sheet 23 on the outer peripheral surface, and the depth of the through hole 34 is increased. The roll shape is crushed and elastically deformed until the thickness becomes the same as that, and an urging force to the outer peripheral side according to the deformation amount is generated.

  FIG. 6A is a conceptual cross-sectional view for explaining a path of static electricity that has entered from between the transparent plate 25 and the back side case 7 in the mobile phone 1.

  As indicated by the arrow y5, the static electricity that has entered the gap between the transparent plate 25 and the back side case 7 from the periphery of the transparent plate 25 flows through the conductive layer 26 and reaches the edge on the inner peripheral side of the conductive layer 26. Furthermore, it flows through the conductor 24, the conductive sheet 23, and the tab 30 and reaches the ground pattern layer 21a.

  FIG. 6B shows a comparative example of the mobile phone 1. The conductor 24 connects the conductive layer 26 and the conductive sheet 23 on the outer peripheral side of the inner peripheral side edge of the conductive layer 26. In this case, the advantage of providing the conductor 24 is hardly obtained, and the static electricity that has entered from between the transparent plate 25 and the back side case 7 ′ is the edge on the inner peripheral side of the conductive layer 26 as indicated by an arrow y 8. To the display device of the opening 33.

  FIG. 6C shows a conventional example of the mobile phone 1. If the conductive sheet 123 is extended to the edge of the opening 133 without providing the conductor 24, and the static electricity flowing through the conductive layer 26 is allowed to escape to the ground pattern layer 21a as indicated by the arrow y10, as indicated by the arrow y11. In addition, a relatively large amount of static electricity may flow from the opening 133 to the display device.

  FIG. 7 is a block diagram showing an example of the configuration of the signal processing system of the mobile phone 1. The CPU 41 and the memory 42 are configured by, for example, an IC, and function as a control unit that performs predetermined calculations based on signals from various units such as the operation unit 17 and controls various units such as the image processing unit 45.

  The communication processing unit 43 is configured to include a high-frequency circuit, modulates various data such as audio data and image data processed by the CPU 41 and transmits the data via the antenna 47 in order to perform wireless communication using radio waves. To do. Further, the communication processing unit 43 demodulates a signal received via the antenna 47 and outputs the demodulated signal to the CPU 41.

  The voice processing unit 44 converts the voice data from the CPU 41 into a voice signal and outputs the voice signal to the speaker 48 for calling and the speaker 50 for notifying incoming calls. The audio processing unit 44 converts the audio signal from the microphone 49 into audio data and outputs the audio data to the CPU 41. The image processing unit 45 converts the video data from the CPU 41 into a video signal and outputs the video signal to the main display unit 11 and the sub display unit 12.

  According to the above embodiment, the conductor 24 that is disposed in the through hole 34 that is opened at the position where the conductive layer 26 and the conductive sheet 23 overlap and electrically connects the conductive layer 26 and the conductive sheet 23 is provided. Then, the static electricity that has entered between the transparent plate 25 and the back case 7 can be released to the ground of the circuit board 21 through the conductive layer 26, the conductor 24, and the conductive sheet 23, and the static electricity is transferred to the display device 22. The influence exerted can be reduced. Further, when the conductive sheet 23 is disposed on the outer peripheral side of the display device 22 and the display device 22 is brought closer to the inner surface of the back side case 7 at a smaller interval than the thickness of the conductive sheet 23, It is not necessary to secure a space for the shield plate that covers the display device between the inner side surface of the housing and the mobile terminal can be made thinner.

  The conductive layer 26 is provided at a position away from the edge of the opening 33 toward the outer peripheral side, the through hole 34 opens at the position of the inner peripheral side edge of the conductive layer 26, and the conductor 24 is formed of the conductive layer 26. Since the inner peripheral edge of the conductive layer and the conductive sheet 23 are electrically connected, the conductor 24 is provided on the outer peripheral side of the inner peripheral side edge of the conductive layer 26 as shown in FIG. Compared to the case, the intrusion of static electricity from the inner peripheral edge of the conductive layer 26 to the opening 33 can be prevented more reliably.

  Since the conductor 24 has elasticity, the urging force generated when the conductor 24 is sandwiched between the conductive layer 26 and the conductive sheet 23 can reliably contact the conductive layer 26 and the conductive sheet 23, and static electricity can be discharged from the conductive layer 26. It is possible to flow reliably to the conductive sheet 23.

  The elastic conductor 24 can be easily configured by, for example, forming a cylindrical body formed by winding a sheet-like member 24 ′ formed by knitting a conductive wire 36 into a roll shape. In this case, the roll is crushed and an urging force is generated on the outer peripheral side, so that the conductor 24 is brought into close contact with the inner wall of the through hole 34 and is positioned reliably.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The mobile terminal is not limited to a mobile phone as long as it has an opening in the housing and includes an electronic component exposed from the opening. For example, a PDA, a notebook computer, a game machine, or a digital camera may be used.

  The electronic component is not limited to a display device as long as it is provided in the housing and exposed from the opening. For example, an imaging device or an optical sensor may be used. Also, it is not limited to a component that emits light from the opening or a component that receives light from the opening. For example, to make a part of the housing a so-called skeleton type, it is visible from the opening for design reasons. The electronic component made possible may be sufficient.

  The conductor is not limited to one having elasticity as long as it can conduct the conductive layer and the conductive sheet. For example, a metal piece may be used. Moreover, when it has elasticity, it is not limited to what made the sheet | seat the roll shape, For example, it is good also considering the coil spring made from the metal which makes the urging | biasing direction the lamination direction of a conductive layer and a conductive sheet as a conductor. When making a sheet into a roll shape, a sheet is not limited to what knit a wire, and may be a metal board. Further, the roll may be wound once or a plurality of times, and the overlapping portions of the wound sheets may or may not be joined.

  A conductive layer and a conductive sheet are not limited to what is arrange | positioned in the position away from the edge part of the opening part of the housing | casing to the outer peripheral side. In other words, the opening of the conductive layer or conductive sheet may be larger, equal, or smaller than the opening of the housing.

  The conductor and the through hole for arranging the conductor may be provided at a place where intrusion of static electricity should be prevented, such as one place on the side where the control circuit inside the display device is provided in the embodiment. A plurality of openings may be provided over the entire circumference of the opening, for example, in four directions of the opening.

1 is an external perspective view showing a cellular phone according to a first embodiment of the present invention in an open state. The external appearance perspective view which shows the mobile telephone of FIG. 1 in a closed state. FIG. 2 is a partially omitted exploded perspective view of the receiving case of the mobile phone of FIG. 1 as viewed from the back side. FIG. 2 is a partially omitted exploded perspective view of the receiving case of the mobile phone of FIG. 1 as viewed from the front side. The figure which shows the conductor of the mobile telephone of FIG. (A) is a conceptual cross-sectional view for explaining a path of static electricity in the mobile phone of FIG. 1, (b) is a conceptual cross-sectional view for explaining a path of static electricity in a mobile phone of a comparative example, and (c) is a conventional example. FIG. 5 is a conceptual cross-sectional view for explaining a path of static electricity in the mobile phone. The block diagram which shows the structure of the signal processing system of the mobile telephone of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cellular phone (mobile terminal), 2 ... Receiver housing, 21 ... Circuit board, 21a ... Ground pattern layer (ground), 22 ... Display device (electronic component), 23 ... Conductive sheet, 24 ... Conductor, 25 ... Transparent plate, 26 ... conductive layer, 33 ... opening, 34 ... through hole.

Claims (3)

A non-conductive housing having an opening;
An electronic component provided in the housing and exposed from the opening;
A non-conductive transparent plate that covers the opening from the outside of the housing;
A conductive layer provided on the side surface of the transparent plate so as to surround the opening;
A conductive sheet provided on the inner surface of the casing so as to surround the opening, and electrically connected to a ground layer of a circuit board provided in the casing;
A through hole provided in a housing wall sandwiched between the conductive layer and the conductive sheet ;
A conductor disposed in the through hole and electrically connecting the conductive layer and the conductive sheet;
With
The through hole opens at a position of an inner peripheral side edge of the conductive layer ,
The conductor is a cylindrical body formed by winding a sheet-like member in a roll shape, and is disposed in the through hole so that a radial direction of the cylindrical body faces a through direction of the through hole. A portable terminal held between a layer and the conductive sheet while being elastically deformed so as to be crushed by being sandwiched between the layer and the conductive sheet in the radial direction of the cylindrical body, and generating a biasing force toward the outer peripheral side . The sheet-like member is formed by weaving a conductive wire.
The mobile terminal according to claim 1. The conductive layer, the portable terminal according to claim 1 or 2, characterized in that a coating layer having a metal film or a metal strip.

Images