JP2008182600A - Portable terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal device which electrically connect a metal frame and a circuit board to each other without using any extra member and is compact in size. <P>SOLUTION: A mobile phone 1 as the portable terminal device has a display part side casing 3, the metal frame 110 disposed in the display part side casing 3, and the circuit board 120 which is disposed in the display part side casing 3 opposite to the metal frame 110 and also mounted with an electronic component, and has a reference potential pattern 127. Then the electronic component is disposed on the second mount surface 122 of the circuit board 120 on the opposite side from a first mount surface 121 facing the metal frame 110, and a solder joint part 125 electrically connected to the reference potential pattern is disposed on the first mount surface 121, the solder joint part 125 abutting against the metal frame 110 electrically connected to the metal frame 110. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  2. Description of the Related Art Conventionally, in a mobile phone as a mobile terminal device, a metal frame may be disposed in the casing in order to improve the rigidity of the casing. In this case, in order to prevent malfunction caused by static electricity charged on the metal frame, the metal frame is configured to be electrically connected to a reference potential pattern formed on the circuit board.

  Here, in order to electrically connect the metal frame and the circuit board, for example, a tab which is an elastic member may be disposed between the metal frame and the circuit board. However, in this case, there is a case where the thinning is hindered by arranging the tab between the metal frame and the circuit board.

On the other hand, there has been proposed a mobile phone that is electrically connected by crimping the metal frame and the circuit board with an elastic crimping tool without disposing a tab between the metal frame and the circuit board ( For example, see Patent Document 1).
Japanese Patent Laid-Open No. 08-046384

  Here, the cellular phone of Patent Document 1 has a problem that the number of components increases because the metal frame and the circuit board are pressure-bonded by using separate members to ensure electrical continuity. In addition, there is a problem that the size of the mobile phone is increased by the space of the elastic crimping tool.

  The present invention provides a miniaturized portable terminal device that electrically arranges a metal frame and a circuit board without using a separate member by arranging the circuit board provided with solder joints and the metal frame close to each other. The purpose is to do.

  The present invention includes a housing, a metal frame disposed in the housing, and a circuit board disposed in the housing so as to face the metal frame, on which electronic components are mounted and having a reference potential portion. The electronic component is disposed on a second mounting surface opposite to the first mounting surface facing the metal frame on the circuit board, and electrically connected to the reference potential portion on the first mounting surface. The present invention relates to a portable terminal device in which a solder joint portion is provided, and the solder joint portion is in contact with the metal frame and is electrically connected to the metal frame.

  Moreover, it is preferable that the metal frame has a recess formed at a site where the solder joint comes into contact.

  In addition, it is preferable that a plurality of the solder joint portions are disposed so as to be substantially symmetric with respect to at least one of the longitudinal direction center line and the lateral direction center line of the circuit board.

  Here, the longitudinal center line is a center line extending in the longitudinal direction equally dividing the circuit board in the width direction, and the width direction center line is a center line extending in the width direction equally dividing the circuit board in the longitudinal direction. .

  The module further includes a module disposed in the casing opposite to the metal frame on the side opposite to the circuit board in the metal frame, and the solder joint includes the module and the metal frame. Are preferably disposed in a region where they overlap each other.

  Moreover, it is preferable that the said circuit board is arrange | positioned with respect to the said metal frame so that a movement in at least one of a longitudinal direction or a transversal direction is possible.

  Further, all or a part of the surface of the metal frame is subjected to a surface protection treatment, and a portion of the metal frame where the solder joint is in contact with the surface is not subjected to the surface protection treatment. It is preferable that the surface is shaved after the treatment.

  According to the present invention, a miniaturized portable terminal device that electrically arranges a metal frame and a circuit board without using a separate member by arranging the circuit board provided with the solder joint portion and the metal frame close to each other. Can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following, a mobile phone will be described as a mobile terminal device, but the present invention is not limited to this, and may be a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a laptop computer, or the like. There may be.

  The basic structure of the mobile phone 1 as a mobile terminal device will be described with reference to FIGS. FIG. 1 shows a front view of a mobile phone 1 as a mobile terminal device in an open state (first open state). 2A shows a left side view when the mobile phone 1 is opened, and FIG. 2B shows a right side view when the mobile phone 1 is opened. FIG. 3 shows a rear view in a state where the mobile phone 1 is opened. FIG. 4 is a perspective view showing a state in which the display unit side body 3 of the mobile phone 1 is rotated by a predetermined angle about the rotation axis Y of the connecting unit 4.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other via a connection unit 4 having a biaxial hinge mechanism, and the mobile phone 1 can be deformed into an open state and a closed state. In each closed state, the display unit side body 3 can be switched between a front state and a back state.

  Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other. In the open state, the display 30 disposed on the surface 3A of the display unit side body 3 described later and the operation key group 11 disposed on the surface 2A of the operation unit side body 2 are on the same side. The display 30 in the display unit side body 3 and the operation key group 11 in the operation unit side body 2 are opposite to the back state in the open state (see FIG. 1). The state where it is arranged to face. Further, the front state in the closed state is a state in which the display 30 in the display unit side body 3 is arranged so as to face the operation key group 11 in the operation unit side body 2, and the back state in the closed state is In this state, the display 30 in the display unit side body 3 is exposed without facing the operation key group 11 in the operation unit side body 2.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 is configured such that an operation key group 11 and a voice input unit 12 to which a voice uttered by a user of the mobile phone 1 is input are exposed on the front case 2a side. The Here, the operation key group 11 includes a function setting operation key 13 for operating various functions such as various settings, a telephone book function, and a mail function, and a numeric keypad for inputting numbers such as telephone numbers and characters such as mail. Input operation keys 14 and the like, and a determination operation key 15 for performing determinations in various operations, scrolling in the vertical and horizontal directions, and the like. The voice input unit 12 is disposed on the outer end side opposite to the connection unit 4 side in the longitudinal direction of the operation unit side body 2. That is, the voice input unit 12 is arranged on one outer end side when the mobile phone 1 is in the open state.

  Each key constituting the operation key group 11 is predetermined according to a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. Function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  As shown in FIG. 2A, on one side surface of the operation unit side body 2, an interface 16 for transmitting / receiving data to / from an external device (for example, a host device), a headphone / microphone terminal 17, A removable external memory interface 18 and a charging terminal 19 for charging the battery are provided. The interface 16, the headphone terminal / microphone terminal 17, and the interface 18 are covered with a dust-proof cap that can be attached and detached when not in use.

  On the other side of the operation unit side body 2, as shown in FIG. 2B, a pair of side keys 20, an operation key 21 used at the time of imaging, and a broadcast wave whose radio wave reception angle can be adjusted. A receiving antenna 22 is arranged. A predetermined function is assigned to the side key 20 in accordance with a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of the activated application ( Key assignment). Here, similarly to the above, when the side key 20 is pressed by the user, an operation corresponding to the function assigned to the side key 20 in the mobile phone 1 is executed.

  As shown in FIG. 3, a camera unit 23 that captures an image of a subject and a light unit 24 that irradiates the subject with light are disposed in the rear case 2 b of the operation unit side body 2. The camera unit 23 and the light unit 24 are arranged on the connection unit 4 side in the operation unit side body 2. Further, the rear case 2b in the operation unit side body 2 is formed with an opening 92a for mounting the battery 90 in the battery housing portion 92, and the battery lid 25 is disposed so as to close the opening 92a.

  Moreover, the upper end part of the operation part side housing | casing 2 and the lower end part of the display part side housing | casing 3 are connected via the connection part 4 provided with a biaxial hinge mechanism, as shown in FIGS. As shown in FIG. 3, the sub operation key group 33 is arranged in a line in the width direction (short direction) of the mobile phone 1 on one surface (back surface) of the connecting portion 4. Each of the keys constituting the sub operation key group 33 depends on a deformed state such as an open / closed state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. A predetermined function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

The outer surface of the display unit side body 3 includes a front case 3a and a rear case 3b.
In the front case 3a of the display unit side body 3, a display 30 having a predetermined shape for displaying various information and a voice output unit 31 for outputting voice on the other side of the call are arranged so as to be exposed. Here, the audio output unit 31 is disposed on the outer end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is arranged on the other end side when the mobile phone 1 is in the open state.

  In addition, a sub display 32 for displaying various types of information is exposed in the rear case 3 b of the display unit side body 3. Each of the display 30 and the sub-display 32 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel.

  The connection unit 4 connects the operation unit side body 2 and the display unit side body 3 so that the operation unit side body 2 and the display unit side body 3 can be opened and closed at an arbitrary angle around the opening / closing axis X, and at an arbitrary angle around the rotation axis Y. A biaxial hinge mechanism that is pivotably connected is provided.

  The connecting portion 4 is connected to the upper end portion of the operation unit side body 2 by an open / close connecting member (not shown) on one end 4a side, and is connected to the upper end portion of the display unit side case 3 by a rotating connecting member (not shown) on the other end 4b side. It is connected to the lower end.

  A convex opening / closing part 4 c is formed at one end 4 a of the connecting part 4 so as to protrude vertically from the surface of the connecting part 4. A concave cutout portion 5 into which the convex opening / closing portion 4c is inserted is formed at the upper end portion of the operation unit side body 2.

  A hole A (not shown) is formed on each side of the opening / closing portion 4c in the opening / closing axis X direction. Moreover, a hole B (not shown) is formed on both inner side surfaces of the notch portion 5 of the operation unit side body 2. Then, in a state where the convex opening / closing part 4c is inserted into the concave cutout part 5, the hole A and the hole B are disposed so as to face each other in close proximity, and the hole A A cylindrical opening / closing connecting member is inserted through both of the holes B. Thereby, the operation unit side body 2 and the display unit side body 3 are connected so as to be openable and closable. The opening / closing part 4c is not particularly limited to a convex shape as long as the opening / closing part 4c is inserted into the upper end part of the operation unit side body 2, and the shape of the upper end part of the operation unit side body 2 is also concave. Not limited to.

  Moreover, the other end 4b side of the connection part 4 and the lower end part of the display part side housing | casing 3 are rotatably connected by the rotation connection member which is not shown in figure. A hole C (not shown) is formed on the side surface of the connecting unit 4 on the display unit side body 3 side. A hole D (not shown) is formed on the side surface of the display unit side body 3 on the connection unit 4 side. Then, the rotation connecting member is inserted into both the hole C and the hole D, so that the operation unit side body 2 and the display unit side body 3 can rotate about the rotation axis Y. Connected. That is, the operation unit side body 2 and the display unit side body 3 are connected so that the front and back states of the display unit side body 3 can be switched.

  As described above, in the mobile phone 1, the operation unit side body 2 and the display unit side body 3 are connected by the connection unit 4 so as to be opened and closed and rotated. As a result, the mobile phone 1 is opened or closed by opening and closing the operation unit side body 2 and the display unit side body 3 about the opening / closing axis X, or rotating about the rotation axis Y. It can be transformed into various states.

  For example, the cellular phone 1 in a closed state (first closed state) in which the operation unit side body 2 and the display unit side body 3 overlap each other is connected to the operation unit side body 2 and the display unit side body 3 respectively. The opening on the side opposite to the opening / closing axis X is deformed so as to open around the opening / closing axis X so as to be separated from each other, so that the operation unit side body 2 and the display unit side body 3 do not overlap each other. It can be in the state (first open state).

  On the contrary, the mobile phone 1 in the open state (first open state) is opened with the opening / closing axis X so that the ends opposite to the opening / closing axis X of the operation unit side body 2 and the display unit side body 3 approach each other. By changing the shape so as to be closed at the center, the closed state (first closed state) can be obtained.

  Moreover, in the open state (first open state), as shown in FIG. 4, the display unit side body 3 can be rotated around the rotation axis Y. Furthermore, by rotating the display unit side body 3 around the rotation axis Y, the front and back states of the display unit side body 3 can be switched. Specifically, the display 30 disposed on the surface 3A of the display unit side body 3 and the operation key group 11 disposed on the surface 2A of the operation unit side body 2 are in an open state (first In the open state, the display unit side body 3 is rotated 180 degrees around the rotation axis Y and is disposed on the surface 3A of the display unit side body 3 and the surface 2A of the operation unit side body 2 The operation key group arranged in the open state (second open state) facing the opposite side.

  Then, by deforming the display unit side body 3 in the second open state so as to be closed about the opening / closing axis X, the mobile phone 1 can be closed (second closed state). In other words, the mobile phone 1 changes from the closed state (first closed state) in which the display 30 in the display unit side body 3 is arranged to face the operation key group 11 in the operation unit side body 2 to the display unit side housing. The display 30 in the body 3 can be transformed into a closed state (second closed state, turn-closed state) in which the display 30 is exposed without facing the operation unit side body 2.

  In the present embodiment, the foldable mobile phone 1 by the connecting portion 4 is described. However, it is not a foldable type, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is slid in one direction, or one of the casings is rotated about an axis along the direction in which the operation unit side casing 2 and the display unit side casing 3 overlap. A rotating (revolver) type, or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one case and do not have a connecting portion may be used.

  Next, the internal structure of the display unit side body 3 will be described with reference to FIGS. 5 and 6. FIG. 5 is an exploded perspective view of the display unit side body 3. FIG. 6 is a plan view of the metal frame 110 on the side of the bottom surface 112 a facing the circuit board 120.

  As shown in FIG. 5, the display unit side body 3 includes a front case 3 a, a display unit 100 as a module, a metal frame 10, a reference potential pattern 127 as a reference potential unit, and an electronic component for display. A circuit board 120, a sub display unit 130, and a rear case 3b are provided.

  The front case 3a and the rear case 3b are arranged so that their concave inner surfaces face each other, and are joined so that their outer peripheral edges overlap. Further, between the front case 3a and the rear case 3b, the display unit 100, the metal frame 110, the circuit board 120, and the sub display unit 130 are accommodated and disposed in this order from the front case 3a side.

  The front case 3a is formed by fixing the LCD cover 300b and the front cover 300c on the surface of the case body 300a.

  The display unit 100 includes a display 30 and a holder that fixes the display 30.

  The metal frame 110 is a member having an H-shaped cross section, and shallow concave housing portions 111 and 112 are formed on the front case 3a side and the rear case 3b side. The display unit 100 is accommodated in the accommodating part 111 on the front case 3a side in the metal frame 110, and the circuit board 120 is accommodated in the accommodating part 112 on the rear case 3b side. Here, the metal frame 110 functions as a reinforcing member for securing rigidity with respect to a bending operation and a twisting operation in the display unit side body 3 and a shield for electrostatic countermeasures.

  In addition, as shown in FIG. 6, a plurality of recesses 115 are formed on the bottom surface 112 a of the housing portion 112 in the metal frame 110. The plurality of recesses 115 are formed at positions corresponding to a plurality of solder joints 125 formed on the circuit board 120 described later. Further, the recess 115 is formed so that the volume of the recess 115 is the same as or slightly smaller than the volume of the solder joint 125. Here, the surface of the metal frame 110 is subjected to a predetermined surface protection treatment for the purpose of preventing corrosion or the like. However, at the position where the recess 115 is formed, a process of cutting the surface of the metal frame 110 on which the surface protection process has been performed in order to form the recess 115 is performed. Therefore, the metal member constituting the metal frame 110 is exposed at the position where the recess 115 is formed.

  The circuit board 120 is accommodated in the accommodating part 112 formed in the metal frame 110 as described above. Various electronic components (not shown) are arranged on the second mounting surface 122 of the circuit board 120 on the rear case 3b side. The audio output unit 31 described above is disposed on the end side opposite to the connection unit 4 on the second mounting surface 122 of the circuit board 120. Various electronic components arranged on the second mounting surface 122 form a circuit block such as a display control block that performs display control of the display mode and timing of the display 30 and the sub-display 32 by a predetermined combination.

  A reference potential pattern 127 serving as a reference potential portion (not shown) is formed on the outer peripheral portion of the first mounting surface 121 on the metal frame 110 side of the circuit board 120. A plurality of solder joints 125 are formed on the first mounting surface 121 on the inner side than the reference potential pattern 127. The solder joint portion 125 is formed by a flow in which a predetermined amount of solder material is joined to the first mounting surface 121 by printing, reflow processing, or the like. The plurality of solder joints 125 are formed so as to be line symmetric with respect to the longitudinal center line, and are formed to be line symmetric with respect to the short direction center line. Here, the plurality of solder joint portions 125 are electrically connected to a reference potential layer (not shown) provided in the inner layer portion of the circuit board 120.

  Then, in a state where the circuit board 120 is disposed so as to be accommodated in the accommodating portion 112 of the metal frame 110, each of the plurality of solder joint portions 125 is formed on the inner surface of each of the plurality of concave portions 115 formed at the above-described opposing positions. Abut and become electrically conductive. As a result, the metal frame 110 is electrically connected to the reference potential layer, which is the reference potential portion of the circuit board 120, via the solder joint portion 125.

  The sub display unit 130 includes a sub display 32 and a holder for fixing the sub display 32. The sub display unit 130 is disposed so as to be sandwiched between the rear case 3 b and the circuit board 120. That is, the sub display unit 130 presses the circuit board 120 against the metal frame 110 side by a force applied by being sandwiched between the front case 3a and the rear case 3b. Moreover, the sub display unit 130 is arrange | positioned so that it may expose from the window part 3c formed in the rear case 3b as mentioned above.

  Next, a conductive structure in which a plurality of solder joints 125 formed on the circuit board 120 are electrically connected to the metal frame 110 will be described with reference to FIG. FIG. 7 shows a cross-sectional view in a state in which the display unit 100 and the circuit board 120 are incorporated in the metal frame 110. Here, the metal frame 110 may be made of a magnesium alloy or a metal member having electrical conductivity such as an aluminum alloy.

  As shown in FIG. 7, each of the plurality of solder joints 125 formed on the first mounting surface 121 of the circuit board 120 is inserted into each of the plurality of recesses 115 formed on the bottom surface 120 a in the housing part of the metal frame 110. Arranged in this way. Each of the plurality of solder joints 125 is formed such that the volume of each of the plurality of solder joints 125 is slightly larger than the volume of each of the plurality of recesses 115. Are arranged so as to fit in each of the plurality of recesses 115. Since the solder joint portion 125 is made of a deformable solder material, the solder joint portion 125 is deformed along the shape of the concave portion 115 and disposed on the inner surface of the concave portion 115 without a gap. Further, it is elastically deformed by the pressing force from the sub display unit 130 side and is securely brought into contact with the inner surface of the recess 115.

  As described above, the solder joint portion 125 is electrically connected to the metal frame 110 by being disposed so as to be inserted into the concave portion 115 formed by performing the process of cutting the surface subjected to the surface protection treatment. Since the solder joint portion 125 is formed so as to be electrically connected to the reference potential layer 127 formed on the circuit board 120, the metal frame 110 is electrically connected to the reference potential portion disposed on the circuit board 120. Is electrically conducted.

  In addition, the display unit 100 is disposed on the metal frame 110 on the opposite side of the circuit board 120. The display unit 100 is disposed in a region including a position corresponding to a region where the solder joint portion 125 is formed on the circuit board 120. In other words, each of the plurality of solder joints 125 is formed at a position corresponding to a region where the display unit 100 and the metal frame 110 overlap each other. Thereby, in the state where the display unit side body 3 is assembled, the display unit 100 is fixed in a state where the metal frame 110 is pressed toward the circuit board 120, so that each of the plurality of solder joints 125 includes a plurality of recesses 115. It is preferably abutted against the inner surface of each.

  In this embodiment, the metal frame 110 and the circuit board 120 are used without using separate members by stacking and arranging the circuit board 120 having the plurality of solder joint portions 125 formed on the first mounting surface 121 and the metal frame 110. Can be electrically connected to each other. Thereby, the mobile telephone 1 as a portable terminal device can be reduced in size (thinner). In addition, the metal frame 110 and the circuit board 120 can be electrically connected with a simple configuration. Further, by forming the solder joint portion 125 at an arbitrary position, the metal frame 110 and the circuit board 120 can be electrically connected at an arbitrary position.

  In the present embodiment, a plurality of recesses 115 are formed in the metal frame 110, and a plurality of solder joints 125 are arranged so as to be inserted into the plurality of recesses 115, respectively. Thereby, the portable terminal device can be further reduced in size (thinned).

  In the present embodiment, since a plurality of solder joints 125 are formed on the circuit board 120, the load applied to the circuit board 120 from the metal frame 110 can be dispersed. In addition, since the metal frame 110 is electrically connected to the reference potential portion of the circuit board 120 at a plurality of locations, when the mobile terminal device includes an antenna, it is possible to suppress the influence on the characteristics of the antenna.

  In the present embodiment, the plurality of solder joints 125 are formed so as to be symmetrical with respect to the longitudinal center line of the circuit board 120 and are symmetrical with respect to the lateral center line. Formed. Thereby, the load applied to the circuit board 120 from the metal frame 110 can be more uniformly distributed.

  In the present embodiment, since the solder joint portion 125 is made of a solder material, the degree of freedom in selecting the material constituting the metal frame 110 is increased.

  In the present embodiment, the solder joint 125, which is a member electrically conducting to the metal frame 110, is made of a solder material, so that another member can be formed without providing a process for forming the solder joint 125 anew. The solder joint portion 125 can be formed in the step of soldering.

  Further, in this embodiment, since a tab or the like which is a separate member is not used to electrically connect the circuit board 70 and the metal frame 110, the component cost is reduced and the mounting cost for mounting the tab is reduced. Is reduced. In the present embodiment, the reference potential portion of the circuit board 120 is disposed in the operation unit side body 2 via a cable inserted through the connecting portion 4 and is electrically connected to the battery 90. It is electrically connected to a reference potential portion of a main circuit board (not shown).

  As mentioned above, although preferred embodiment of this form was described, this invention can be implemented with a various form, without being limited to embodiment mentioned above. For example, in the present embodiment, the metal frame 110 is a member separated from the case constituting the operation unit side body 2, but is not limited to this, and may be formed integrally with the case by insert molding. Good.

  In the present embodiment, the metal frame is disposed in the display unit side body 3, but is not limited thereto, and may be disposed in the operation unit side body 2.

  Moreover, in this embodiment, although the metal frame 110 is comprised with magnesium, it is not limited to this, You may be comprised with other metals, such as aluminum and iron.

  In the present embodiment, the metal frame 110 is formed with a plurality of recesses 115, but is not limited thereto, and may be a flat surface.

  Further, in the present embodiment, the solder joint portion 125 and the concave portion 115 are formed at positions corresponding to regions where the display unit 100 as a module and the metal frame 110 overlap with each other, but the present invention is not limited to this. It can be formed at any position where a load is applied during use.

  In this embodiment, the display unit 100 is used as a module. However, the present invention is not limited to this, and another module such as a camera unit may be used.

  In the present embodiment, the circuit board 120 is fixed to the metal frame 110, but is not limited to this, and the circuit board 120 is disposed so as to be movable (slidable) in the longitudinal direction and / or the lateral direction. May be. As a result, the solder joint portion 125 scrapes the surface of the metal frame 110 as the metal frame. For example, even if the surface protection treatment is performed, the portion in contact with the solder joint portion 125 can be electrically connected. This is preferable. Further, since the circuit board 120 slides in the plane direction, the flux on the surface of the solder joint portion 125 can be scraped off by friction, and conduction between the solder joint portion 125 and the metal frame 110 can be reliably performed. it can.

  In the present embodiment, the surface of the metal frame 110 is subjected to a surface protection treatment, but the present invention is not limited to this, and the surface protection is performed only at a position where the surface protection treatment is not performed or the solder joint portion 125 abuts. Processing may not be performed.

The front view in the state (1st open state) which opened the mobile telephone 1 as a portable terminal device is shown. (A) The left view in the state which opened the mobile telephone 1 is shown, (B) The right view in the state which opened the mobile telephone 1 is shown. The rear view in the state which opened the mobile telephone 1 is shown. The perspective view of the state which rotated the display part side housing | casing 3 of the mobile telephone 1 about the rotation axis Y of the connection part 4 by the predetermined angle is shown. The disassembled perspective view of the display part side housing | casing 3 is shown. 3 is a plan view of the metal frame 110 on the side of the bottom surface 112a facing the circuit board 120. FIG. Sectional drawing in the state assembled so that the display unit 100 and the circuit board 120 might be accommodated in the metal frame 110 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Operation part side body 3 Display part side body 4 Connection part 110 Metal frame 115 Recess 120 Circuit board 121 First mounting surface 122 Second mounting surface 125 Solder joint 127 Reference potential pattern

Claims (6)

A housing,
A metal frame disposed in the housing;
A circuit board disposed in the casing so as to face the metal frame, on which electronic components are mounted and having a reference potential portion,
The electronic component is disposed on a second mounting surface opposite to the first mounting surface facing the metal frame on the circuit board, and is electrically connected to the reference potential portion on the first mounting surface. Solder joints are arranged,
The portable terminal device, wherein the solder joint is in contact with the metal frame and is electrically connected to the metal frame.   The portable terminal device according to claim 1, wherein the metal frame has a recess formed in a portion where the solder joint comes into contact.   3. The mobile phone according to claim 1, wherein a plurality of the solder joint portions are arranged so as to be substantially symmetrical with respect to at least one of a longitudinal center line and a lateral center line of the circuit board. Terminal device. A module disposed in the housing and opposite to the metal frame on the side opposite to the circuit board in the metal frame,
4. The mobile terminal device according to claim 1, wherein the solder joint portion is disposed in a region where the module and the metal frame overlap each other. 5.   5. The mobile terminal device according to claim 1, wherein the circuit board is arranged to be movable in at least one of a longitudinal direction and a lateral direction with respect to the metal frame. All or part of the surface of the metal frame is subjected to surface protection treatment,
2. The part of the metal frame where the solder joint abuts is not subjected to the surface protection treatment or is subjected to a surface grinding process after the surface treatment is applied. The mobile terminal device according to any one of 1 to 5.

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