JP4485445B2 - Mobile terminal device - Google Patents

Description

  The present invention relates to a mobile terminal device such as a mobile phone or a notebook computer.

A portable terminal device including an electroacoustic conversion unit such as a receiving speaker, a notification speaker, and a transmitting microphone is known (for example, Patent Document 1). The electroacoustic conversion unit is disposed close to the inner surface of the housing in order to efficiently emit sound to the outside of the housing or collect sound from the outside of the housing. On the other hand, the mobile terminal devices are being made thinner, and the distance between the inner surface of the housing and the substrate on which electronic components such as a high-frequency circuit are arranged is also shortened. Therefore, the electroacoustic conversion unit is disposed at a position relatively close to the substrate.
JP 2004-254026 A

  However, the electroacoustic conversion unit is not shielded, and electronic components cannot be arranged on the substrate around the electroacoustic conversion unit. For this reason, the freedom degree of arrangement | positioning of components and the compactization of the electroacoustic conversion part vicinity are restrict | limited. Moreover, if the electroacoustic conversion part is shielded and electronic components are arranged, a shield member must be provided, which increases the number of parts and prevents the electroacoustic conversion part from being made compact.

  The objective of this invention is providing the portable terminal device which can arrange | position an electronic component in the electroacoustic conversion part vicinity.

  The portable terminal device according to the present invention has a main surface on the first case member between a casing provided with a first case member and a second case member that are overlapped with each other, and the first case member and the second case member. A board disposed opposite to the board, an electronic component arranged on the main surface of the board, and a position facing the electronic component on the board side of the first case member, and an electrical signal and an acoustic signal An electroacoustic conversion unit that converts the acoustic conversion unit, and a holding member that covers the electroacoustic conversion unit and fixes the acoustic conversion unit to the first case member, the first case member including the substrate A case rib protruding to the side is provided, and the holding member is provided with a holding member rib surrounding the electronic component by the case rib, and the first case member and the holding member are located in a region surrounding the electronic component. Electrically conductive, are electrically connected to the ground of the substrate.

  Preferably, the electroacoustic conversion means is a speaker, and the electronic component is a sound source unit that generates an electric signal to be converted into an acoustic signal by the speaker, and the electric component connected to the speaker and from the sound source unit. One of the terminals for supplying a signal to the speaker, and the other of the sound source section and the terminal is disposed outside a region surrounding the electronic component.

  Preferably, an antenna for transmitting and receiving radio signals to and from a communication network is further provided, and the antenna is provided outside a region surrounded by the case rib and the holding member rib.

  According to the portable terminal device of the present invention, an electronic component can be arranged near the electroacoustic conversion unit.

  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 housing 2 and the transmitting housing 3 are connected at their respective ends by a connecting portion 4, and the mobile phone 1 can be opened and closed with the connecting portion 4 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 resin, for example. In the case 6 on the front side of the receiving housing 2, a sound output port 13 of a speaker for calling is opened.

  The receiving housing 2 is provided with a main display unit 11 that displays an image on the front surface and a sub display unit 12 that displays an image on the back surface. The main display unit 11 and the sub display unit 12 are configured by, for example, a liquid crystal display.

  The transmitter case 3 includes a front side case (second case member) 8 facing the receiver case 2 in the closed state, a rear case (first case member) 9 on the rear side, and a rear side. A lid 10 is provided on the back side of the case 9. The front side case 8, the back side case 9, and the lid 10 are each formed of resin, for example. The front case 8 of the transmitter housing 3 has a sound collection port 18 of a microphone for calling, and the sound output port 19 of a notification speaker is opened on the lid 10.

  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.

  FIG. 3 is an exploded perspective view showing a schematic configuration inside the transmission case 3. In the transmitter case 3, the front side case 8, the key assembly 21, the board assembly 22, the back side case 9, and the lid body 10 are laminated in this order. The key assembly 21 and the board assembly 22 are sandwiched and fixed between the front case 8 and the back case 9 by fixing the front case 8 and the back case 9 to each other with screws or the like. The front case 8 and the back case 9 are provided with a boss (not shown) for positioning the key assembly 21 and the substrate assembly 22.

  The key assembly 21 is configured by joining a numeric keypad 17a, a cursor key 17b, a function key 17c, and the like on a key sheet 24 formed of silicon or the like.

  The board assembly 22 includes a board 26, a shield case 27 that covers the board 26 on the key assembly 21 side, and a flexible printed wiring board (FPC) 28 that is disposed on the shield case 27. The shield case 27 shields a high-frequency circuit or the like provided on the substrate 26. The FPC 28 includes a plurality of push switches 31 on the key assembly 21 side. The pressing switch 31 is turned on and off by pressing the various keys 17a to 17c.

  FIG. 4 is a perspective view showing a main surface 26s of the substrate 26 on the back side case 9 side. The substrate 26 is configured as, for example, a multilayer printed circuit board in which a pattern layer, an insulating layer, a ground layer, and a power supply layer are stacked. A main surface 26s of the substrate 26 has a ground line 26b disposed on the insulating layer 26a. Is formed. The ground line 26b is made of a conductive material such as metal, is connected to the ground layer, and extends vertically and horizontally to divide the main surface 26s into a plurality of sections.

  Various electronic components are arranged in each section partitioned by the ground line 26b. Various electronic components include, for example, a sound source IC (sound source unit) 35 that generates an electrical signal converted into an acoustic signal by a speaker 42 (FIG. 5) described later, a terminal 36 connected to the speaker 42, and the receiving housing 2. A connector 37 for connecting a signal line extending from the board 26 to the substrate 26, a slot 38 for inserting / removing a recording medium, and an antenna 39 for transmitting / receiving a radio signal to / from the communication network are included. Note that a plurality of electronic components arranged in the same section basically form one module.

  The sound source IC 35 includes, for example, a CPU, a RAM, a ROM, and the like, and holds sound source data such as a ring tone and music for informing the user of an incoming call. When a control signal instructing output of a ringtone or music is input from a control unit (not shown), the sound source IC 35 selects and reads out sound source data designated by the control signal, and reads the sound source data from the intensity of the sound. Is converted into an electrical signal with a pattern corresponding to

  The antenna 39 is arranged outside the section divided by the ground line 26b so that the sound source IC 35 and the terminal 36 are not arranged in the same section.

  The terminal 36 is disposed in a section 26f adjacent to the section 26e in which the sound source IC 35 is disposed. The terminal 36 is electrically connected to the sound source IC 35 through a pattern layer lower than the insulating layer 26a (at the back of the paper), and an electrical signal from the sound source IC 35 is output to the terminal 36.

  FIG. 5 is an exploded perspective view showing the substrate 26 side (inner side) of the back side case 9. FIG. 6 is a view showing the back side case 9 from the lid 10 side (outside). In FIG. 5, a member 41 that closes the insertion port of the slot portion 38 (see FIG. 4) is shown attached to the rear case 9.

  The back side case 9 is formed in a box shape having a concave inside as a whole. As shown in FIG. 6, a recess 51 for storing a battery over a relatively wide range is formed on the outer side of the back side case 9, and as shown in FIG. Occupies most of the inner surface, and a flat surface 52 formed by the bottom of the concave portion 51 and a concave portion 53 that is concave with respect to the flat surface 52 are formed.

  Case ribs 54 protruding toward the substrate 26 are provided on the flat surface 52 and its periphery. The case rib 54 extends so as to substantially match the pattern of the ground line 26b of the substrate 26, and divides the back side case 9 into a plurality of sections. The case rib 54 has a height that makes contact with the main surface 26 s of the substrate 26 when the substrate 26 and the back side case 9 are laminated. In other words, the height is set to be equal to or higher than the height of the electronic component disposed on the main surface 26s of the substrate 26.

  The flat surface 52 is plated, including the case ribs 54, to form a conductive film F1. A plurality of notches 55 are formed in the case rib 54. As shown in FIG. 4, a spring contact 71 connected to the ground line 26 b is formed on the substrate 26 at a position facing the notch 55. When the substrate 26 and the rear case 9 are laminated, the spring contact 71 contacts the notch 55 and the conductive film F1 on the flat surface 52 is connected to the ground of the substrate 26.

  As shown in FIG. 5, the recess 53 is located at the end on the side where the receiver case 2 and the transmitter case 3 are connected. A speaker (electroacoustic conversion unit) 42 for outputting a ring tone or music is attached to the recess 53. Specifically, it is as follows.

  The back side case 9 is formed with a sound guide recess 56 (FIG. 6) having a concave on the outside of the back side case 9. The sound guide recess 56 forms a protrusion 56 ′ (FIG. 5) on the inner side (recess 53) of the back side case 9. A concave portion 57 into which the speaker 42 is inserted is formed in the protruding portion 56 ′. The concave portion 57 forms a protruding portion 57 ′ (FIG. 6) in the sound guide concave portion 56. The recess 57 is formed in a shape to which the speaker 42 is fitted, and an opening 58 having a smaller diameter than the diameter of the speaker 42 is formed at the bottom.

  The speaker 42 is formed, for example, in a substantially disk shape, and includes a sound emitting part 42a on one surface of the disk and an electrode part 42b on the other surface. The sound emitting part 42a is provided with a diaphragm (not shown), and the electrode part 42b is provided with a contact (not shown). The speaker 42 is inserted into the concave portion 57 with the sound emitting portion 42 a side facing the opening 58. The concave portion 57 is covered with the holding member 43, and the speaker 42 is fixed by being sandwiched between the bottom portion of the concave portion 57 and the holding member 43.

  The holding member 43 is, for example, a resin member having a size that can be fitted into the recess 53 and is generally formed in a plate shape. The holding member 43 is provided with a through hole 43a, and a bolt (not shown) inserted through the through hole 43a is screwed into a screw boss 59 provided in the back side case 9, whereby the holding member 43 is back. Fixed to the side case 9. The holding member 43 is provided with an opening 43 c for connecting the electrode portion 42 b of the speaker 42 and the terminal 36.

  Note that the sound output from the speaker 42 is transmitted from the sound outlet 19 (see FIG. 1) and the sound outlet 60 (see FIG. 6) through the sound space formed by the sound guide recess 57 and the lid 10. Sound is emitted outside the body.

  In the mobile phone 1, the holding member 43 has functions such as blocking static electricity to the speaker 42, shielding components mounted on the substrate 26, and preventing deformation of the substrate when pressing the keys 17 a to 17 c. Specifically, it is as follows.

  A holding member rib 65 protruding toward the substrate 26 is provided on the surface 43b of the holding member 43 on the substrate 26 side. The holding member rib 65 (65a, 65b, 65c) extends so as to substantially coincide with a part of the pattern of the ground line 26b of the substrate 26. Accordingly, the holding member rib 65 (65a, 65b, 65c) is a case rib 54 on the flat surface 52 of the back side case 9 that is a part of the plurality of sections partitioned by the ground line 26b and at least partially overlaps the holding member 43. (54a, 54b, 54c, 54e, 54f) form a continuous wall and surround it. Specifically, the compartment 26e and the compartment 26f shown in FIG. 4 are surrounded by the holding member rib 65 and the case rib 54.

  FIG. 7 shows a state in which the compartment 26e and the compartment 26f overlap the back side case 9 and the holding member 43. In the figure, hatched areas are a section 26e and a section 26f, and the section 26e is a paper surface of the vertical portion 54a, the horizontal portion 54b, the vertical portion 54c of the case rib 54, the vertical portion 65a of the holding member rib 65, and the horizontal portion 65b. The right half is surrounded by the vertical portion 65c. The partition 26f is surrounded by the vertical portion 54e and the horizontal portion 54f of the case rib 54, the left half of the paper surface of the horizontal portion 65b of the holding member rib 65, and the vertical portion 65c.

  The section 26e overlaps the speaker 42 (not shown in FIG. 7 because it is hidden by the holding member 43). Further, the opening 43c for connecting the speaker 42 and the terminal 36 is formed closer to the partition 26f than the vertical portion 65c that partitions the partition 26e and the partition 26f. Further, the section 26g is an unshielded area, and an antenna 39 is disposed here to eliminate interference with the sound source IC 35.

  The holding member rib 65 has a height that comes into contact with the main surface 26 s of the substrate 26 when the substrate 26 and the back side case 9 are laminated. In other words, the height is set to be equivalent to the case rib 54 with respect to the flat surface 52 of the back case 9. Note that the surface 43 b of the holding member 43 is set to have substantially the same height as the flat surface 52 of the back side case 9.

  A plating process is performed on the surface 43b of the holding member 43 on the substrate 26 side, including the holding member ribs 65, to form a conductive film F2. A plurality of notches 66 are formed in the holding member rib 65. As shown in FIG. 4, a spring contact 72 connected to the ground line 26 b is formed on the substrate 26 at a position facing the notch 66. When the substrate 26 and the rear case 9 are stacked, the spring contact 72 contacts the notch 66, and the conductive film F2 on the surface 43b is connected to the ground of the substrate 26.

  According to the above embodiment, the case rib 54 and the holding member rib 65 surround the sound source IC. In the enclosed section 26e, the back side case 9 and the holding member 43 have conductivity, and the substrate 26 Since it is electrically connected to the ground line 26b, not only the noise between the sound source IC and the speaker 43 but also the noise between the sound source IC and other electronic components, for example, the terminal 36 is cut off. . In addition, the holding member rib 65 prevents the substrate 26 from being deformed when the key is pressed, and further prevents static electricity from flowing to the speaker 43.

  In addition, since the electronic component surrounded by the case rib 54 and the holding member rib 65 is a sound source IC, the distance from the sound source IC to the speaker 43 is shortened, and the module can be made compact. In the meantime, the mixing of noise is also reduced.

  Furthermore, since the antenna 39 is disposed outside the shield area of the sections 26e and 26f, the antenna 39 is not affected by noise even though it is disposed in the vicinity.

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

  The electroacoustic conversion unit is not limited to a speaker as long as it can convert an electrical signal into an acoustic signal or an acoustic signal into an electrical signal. For example, a microphone may be used. The electronic component provided in the region surrounded by the case rib and the holding member rib may be any electronic component and is not limited to the sound source IC.

  The first case member and the holding member may have conductivity by various methods, and are not limited to those in which the conductive film is formed by plating. For example, it may be formed by applying a conductive paint such as a paint mixed with metal powder, or may be formed by arranging a metal plate. When a metal plate is disposed, a rib surrounding the electronic component may be formed by bending the metal plate. Moreover, you may form the whole holding member with a metal.

1 is an external perspective view showing a mobile phone according to an 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. The disassembled perspective view which shows schematic structure inside the transmission housing | casing of the mobile telephone of FIG. The perspective view which shows the board | substrate inside the transmission housing | casing of FIG. The perspective view which looked at the back side case of the transmission housing | casing of FIG. 3 from the housing | casing internal side. The perspective view which looked at the back side case of the transmission housing | casing of FIG. 3 from the housing | casing outer side. The front view which looked at the back side case of the transmission housing | casing of FIG. 3 from the housing inner side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Mobile phone (mobile terminal device), 3 ... Transmitting housing, 8 ... Front side case (second case member), 9 ... Back side case (first case member), 26 ... Substrate, 26s ... Main surface, 35 ... Sound source IC (electronic component), 42 ... Speaker (electroacoustic transducer), 43 ... Holding member, 54 ... Case rib, 65 ... Holding member rib.

Claims (4)

A housing including a first case member and a second case member that are stacked on each other;
A substrate disposed between the first case member and the second case member with the main surface facing the first case member;
An electronic component disposed on the main surface of the substrate;
An electroacoustic transducer disposed at a position facing the electronic component on the substrate side of the first case member and converting an electrical signal and an acoustic signal;
A holding member that covers the electroacoustic transducer and fixes the acoustic transducer to the first case member,
The first case member is provided with a case rib protruding to the substrate side,
The holding member is provided with a holding member rib surrounding the electronic component by the case rib,
The first case member and the holding member have conductivity in a region surrounding the electronic component, and are electrically connected to the ground of the substrate ,
The electroacoustic conversion means is a speaker.
The electronic component is one of a sound source unit that generates an electrical signal that is converted into an acoustic signal by the speaker, and a terminal that is connected to the speaker and supplies the electrical signal from the sound source unit to the speaker.
The other of the sound source unit and the terminal is a mobile terminal device arranged outside an area surrounding the electronic component . A housing,
A substrate disposed inside the housing;
Electronic components arranged on the main surface of the substrate;
An electroacoustic conversion unit that is disposed at a position facing the electronic component on the substrate side of the housing and converts an electrical signal and an acoustic signal;
A holding member that fixes the electroacoustic transducer with respect to the housing;
The casing is provided with a case rib protruding to the substrate side,
The holding member is provided with a holding member rib surrounding the electronic component by forming a continuous wall with the case rib,
The portable terminal device, wherein the housing and the holding member have conductivity in a region surrounding the electronic component and are electrically connected to a ground of the substrate. An antenna for transmitting and receiving radio signals to and from the communication network;
The portable terminal device according to claim 1, wherein the antenna is provided outside a region surrounded by the case rib and the holding member rib. The press switch capable of pressing operation is disposed on the main surface side of the substrate opposite to the side on which the electronic component is disposed on the substrate. The mobile terminal device according to any one of the above.

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