JP2010109680A - Mobile electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile electronic apparatus which does not propagate the vibration occurring at an electronic circuit to a sheet metal member. <P>SOLUTION: A cell phone 1 includes a case containing a front case 2 and a rear case 11, a sheet metal member 21 arranged inside the case, a circuit board 6 arranged on one surface side of the sheet metal member, a liquid crystal display 91 arranged on the other surface side of the sheet metal member 21, a flexible printed board 7 which is arranged to stride from one surface side of the sheet metal member 21 to the other surface side and is connected to the circuit board 6 and the liquid crystal display 91, a mounted component which is mounted on the flexible printed board 7 and contains an electronic circuit 71, being possible to cause vibration, and an elastic sheet 4 for supporting the liquid crystal 91 to the sheet metal member 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a portable electronic device such as a cellular phone, a PDA, a portable game, a portable television, and a portable radio.

In a mobile phone, a technique for joining a liquid crystal display and a circuit board by a flexible wiring board is known (for example, Patent Document 1). In this technique, a circuit board is disposed on the sheet metal member, and all electronic circuits are mounted on the circuit board.
JP 2004-117659 A

  However, circuit boards and flexible printed boards have mounting components that vibrate like capacitors. The vibration of the mounting component that is oscillating is transmitted to the liquid crystal display via the flexible printed circuit board, and further spreads to the sheet metal member in contact with the liquid crystal display. The sheet metal member has a higher vibration transmission than that of resin, and the sheet metal member is also connected to other parts constituting the mobile phone, so that the vibrations also affect other parts of the mobile phone. Such a situation induces the generation of abnormal noise. In particular, it is not preferable for a mobile phone intended for a call.

  The objective of this invention is providing the portable electronic device which suppresses that the vibration which generate | occur | produces in an electronic circuit spreads to a sheet-metal member.

  The portable electronic device of the present invention is disposed on the sheet metal member disposed inside the housing, the circuit board disposed on one surface side of the sheet metal member, and the other surface side of the sheet metal member. The electronic component, a flexible printed circuit board that is disposed from the one surface side of the sheet metal member to the other surface side, is connected to the circuit board and the electronic component, and is mounted on the flexible printed circuit board. A mounting component that has an electronic circuit and can generate vibration, and an elastic member that supports the electronic component with respect to the sheet metal member.

  Preferably, a gap is formed between a portion of the flexible printed board located on the one surface side of the sheet metal member and the one surface of the sheet metal member.

  Preferably, the electronic component has a light emitting part that generates light, and the sheet metal member is partially embedded in the casing, and a hole is formed in an exposed part from the casing, and the elastic member The member covers the hole.

  Preferably, an outer peripheral portion of the sheet metal member is embedded in the housing, and a housing space for housing the circuit board and the mounting component is formed in the housing on the one surface side of the sheet metal member. An accommodation recess is formed on the other surface side of the sheet metal member, and the electronic component is accommodated. The housing recess of the sheet metal member has an exposed portion as a bottom, and the electronic component is defined as the sheet metal member. The display device displays an image on the opposite side, and a hole is formed in an exposed portion of the sheet metal member from the housing, and the elastic member covers the hole.

  Preferably, the mounting component constitutes a drive circuit for driving the electronic component.

  Preferably, the elastic member has conductivity.

  ADVANTAGE OF THE INVENTION According to this invention, the portable electronic device which suppresses that the vibration which generate | occur | produces in an electronic circuit spreads to a sheet metal member can be provided.

  FIG. 1 is a perspective view showing an external appearance of a mobile phone 1 according to an embodiment of the present invention in an open state.

  The mobile phone 1 is configured as a so-called foldable mobile phone 1 and includes a first housing 3 and a second housing 5 that are rotatably connected to each other between an open state and a closed state. Yes. FIG. 1 shows an open state of the first housing 3 and the second housing 5. The second housing 5 includes a front case 2 that constitutes a portion that faces the first housing 3, and a rear case 11 that constitutes a portion opposite to the first housing 3. The front case 2 and the rear case 11 are fixed to each other by screws or the like, and constitute an accommodation space for accommodating various electronic members in a space formed between the front case 2 and the rear case 11. The front case 2 and the rear case 11 are made of, for example, resin. Further, the front case 2 is provided with a liquid crystal module 9 at an outer portion thereof.

  FIG. 2 is a perspective view after the decorative panel, the liquid crystal module 9 and the like are removed from the front case 2. A part of the metal sheet metal member 21 is embedded in the front case 2. Although the sheet metal member 21 can also be considered as a part of the front case 2, in the present application, the sheet metal member 21 will be described as a member separate from the front case 2. The front case 2 is integrally formed with the sheet metal member 21 by insert molding. Specifically, the sheet metal member 21 is positioned and fixed at a predetermined position in the mold by the fixing hole 24 during resin molding, and then the front case 2 is integrated with the sheet metal member 21 by pouring molten resin into the mold. To mold.

  However, the entire surface of the sheet metal member 21 is not covered with the front case 2, but the outer peripheral portion thereof is covered with the front case 2. Thereby, an exposed portion that is not covered by the front case 2 is generated, and the exposed portion is recessed as compared with the covered portion.

  Further, in order to form a fixing portion 26 that supports and fixes the circuit board 6 and the like housed in the housing space formed between the front case 2 and the rear case 11, a substrate support is provided on the exposed portion of the sheet metal member 21. A hole 25 is opened.

  Furthermore, in addition to the board support hole 25 and the resin molding fixing hole 24, a flexible printed board through hole 23 is also formed in the exposed portion of the sheet metal member 21. This flexible printed circuit board through-hole 23 is used to pass a flexible printed circuit board 7 that connects a liquid crystal display 91 disposed outside the front case 2 to be described later and the circuit board 6 disposed inside the front case 2. It is open to. The sheet metal member 21 has many other holes for achieving various purposes and holes formed in the course of the manufacturing process.

  FIG. 3A is a perspective view of the liquid crystal module 9 as viewed from the display unit side. FIG. 3B is a perspective view of the liquid crystal module 9 as seen from the side where it is joined to the front case 2.

  The liquid crystal module 9 includes a liquid crystal display 91 and a flexible printed circuit board 7. The flexible printed board 7 has an electronic circuit 71. In addition, the flexible printed circuit board 7 can be flexibly deformed from the unfolded state shown by the dotted line to the folded state shown by the solid line in FIG.

  The electronic circuit 71 is for driving the liquid crystal display 91. Specifically, a control signal for the liquid crystal display 91 is input to the flexible printed board 7 from a circuit board 6 described later. The electronic circuit 71 and the mounting parts mounted on the electronic circuit 71 process this control signal, and then change the display on the liquid crystal display 91 according to the control signal.

  FIG. 4 is a perspective view showing how the circuit board 6 and the liquid crystal module 9 are assembled in the front case 2. The liquid crystal module 9, the elastic sheet 4, the front case 2, and the circuit board 6 are stacked in this order. Then, the liquid crystal display 91 and the elastic sheet 4 are fitted into the housing recess formed with the exposed portion where the sheet metal member 21 is not embedded in the front case 2 as the bottom. The circuit board 6 is incorporated into the front case 2 from the inside of the front case 2 and is positioned and fixed by a fixing portion 26 (see FIG. 2).

  Since the flexible printed circuit board 7 can be flexibly deformed, a connector (not shown) on the circuit board 6 is passed through the cutout portion 41 of the elastic sheet 4 and further through the flexible printed circuit board through hole 23 of the front case 2. It is inserted into the part 61.

  At this time, the bonding between the liquid crystal module 9 and the elastic sheet 4 and the bonding between the elastic sheet 4 and the front case 2 are performed by a bonding member such as an adhesive or a double-sided tape. The circuit board 6 and the front case 2 may be joined only by the fixing portion 26, but in addition, the circuit board 6 and the front case 2 may be joined by a bonding member such as an adhesive, a double-sided tape, or a screw.

  The elastic sheet 4 is made of a material having elasticity. Specifically, it is made of a material having a vibration-proof function such as a foamable material, an elastomer (rubber), and a gel-like substance. The main function of the elastic sheet 4 is vibration isolation, but it can also have other functions.

  For example, by creating a foamed material that has conductivity, or by creating a material that has been made to impart conductivity by mixing iron powder into a material that does not have conductivity, the vibration-proof function is achieved. In addition, an electromagnetic shielding function can be provided. Further, by configuring the elastic sheet 4 with a material having a high heat transfer property, it is possible to have a heat transfer function while having a vibration isolation function. In addition, the elastic sheet 4 can be made of a dry material or a moisture absorbing material so as to have a function of absorbing moisture that has entered the second housing 5. Alternatively, the elastic sheet 4 can be made of a chemical substance adsorbing material so as to have a function of adsorbing a chemical substance that has entered the second casing 5 or generated in the second casing 5. In addition, the elastic sheet 4 is made of a material having a large heat capacity so that the internal temperature change does not change suddenly with respect to the temperature change of the external environment, or vice versa. Thus, it is possible to have a function of quickly responding to an external temperature change and preventing dew condensation on the outside of the mobile phone 1.

  The elastic sheet 4 has a notch 41 in a part thereof, and the notch 41 is notched for passing the flexible printed board 7. Note that a hole shape may be used instead of a notch shape.

  Furthermore, the elastic sheet 4 is made of a material that does not transmit light, and covers holes other than the flexible printed circuit board through-holes 23 formed in the sheet metal member 21. As a result, the light emitted from the liquid crystal display 91 is prevented from entering the housing space formed between the front case 2 and the rear case 11. As a result, when light enters the accommodation space formed between the front case 2 and the rear case 11, a part of the rear case 11 appears to shine even though the rear case 11 side does not want to shine. The effect of suppressing can be acquired.

  FIG. 5 is a perspective view of the front case 2 assembled as shown in FIG. 4 as viewed from the outside.

  FIG. 6 is an enlarged perspective view of the front case 2 assembled as shown in FIG. 4 as viewed from the inside. One end of the flexible printed circuit board 7 is inserted into the connector portion 61 disposed on the circuit board 6. The other end of the flexible printed circuit board 7 is coupled to the liquid crystal display 91.

  FIG. 7 is a perspective sectional view taken along line VII-VII in FIG.

  8 is a simplified cross-sectional view taken along the line VIII-VIII in FIG. The electronic circuit 71 has various mounting components mounted on the circuit. Some of the mounted components generate vibration. In particular, a capacitor is likely to cause vibrations because it periodically discharges and stores electricity. Since the electronic circuit 71 is a part of the flexible printed circuit board 7, the vibration generated in the electronic circuit 71 causes the entire flexible printed circuit board 7 to vibrate. This vibration is transmitted to the liquid crystal display 91 to which the flexible printed circuit board 7 is bonded, and the liquid crystal display 91 also vibrates. However, since the liquid crystal display 91 is fixed to the sheet metal member 21 via the elastic sheet 4, transmission of this vibration to the sheet metal member 21 is blocked by the elastic sheet 4. As a result, vibrations of the sheet metal member 21 and the front case 2 are suppressed.

  Further, as can be seen from FIG. 8, the inner sheet metal member 21 is not in direct contact with the flexible printed circuit board 7. That is, a gap 10 is formed between the inner side of the sheet metal member 21 and a portion located on one surface side of the flexible printed circuit board 7. As a result, the vibration from the flexible printed circuit board 7 is not directly transmitted to the sheet metal member 21 (front case 2). If the gap 10 cannot be formed, vibration transmission from the flexible printed circuit board 7 to the sheet metal member 21 cannot be ignored. In this case, the elastic sheet 4 is disposed between the flexible printed circuit board 7 and the sheet metal member 21. May be.

  According to the above embodiment, the mobile phone 1 is provided on the casing having the front case 2 and the rear case 11, the sheet metal member 21 disposed inside the casing, and one surface side of the sheet metal member 21. The circuit board 6, the liquid crystal display 91 disposed on the other surface side of the sheet metal member 21, and the circuit board 6 and the liquid crystal disposed between the one surface side of the sheet metal member 21 and the other surface side. A flexible printed circuit board 7 connected to the display 91, a mounted component that is mounted on the flexible printed circuit board 7, has an electronic circuit 71, and can generate vibration, and an elastic sheet 4 that supports the liquid crystal display 91 with respect to the sheet metal member 21. And have. Due to the presence of the elastic sheet 4, vibration generated in the electronic circuit 71 is not transmitted to the sheet metal member 21 via the liquid crystal display 91. Thereby, it is possible to suppress the cellular phone 1 from vibrating and affecting the call. In addition, it is possible to suppress the deterioration of the parts constituting the mobile phone 1 due to the vibration of the mobile phone 1.

  Further, the mounting component that vibrates can be particularly selected, and the mounting component can be arranged on the flexible printed circuit board 7 in a concentrated manner. As a result, the circuit board 6 has no vibrating electronic member. Therefore, the circuit board 6 does not vibrate, and the vibration of the flexible printed board 7 caused by the concentration of the vibrating mounting components is caused by the elastic sheet 4. It can be prevented from spreading to the part of. If it does so, the vibration of the mobile telephone 1 will reduce as a whole, and it can suppress that a telephone call is influenced. In addition, it is possible to suppress the deterioration of components constituting the mobile phone 1 due to the vibration of the mobile phone 1.

  Furthermore, by disposing the elastic sheet 4 around the liquid crystal display 91, it is possible to suppress the impact from the outside of the mobile phone 1 from being transmitted to the liquid crystal display 91. In other words, the liquid crystal display 91 is made of glass or the like and is vulnerable to impacts. By reducing the impact on the liquid crystal display 91, breakage such as breaking of the liquid crystal display 91 can be suppressed.

  In addition, since the elastic sheet 4 is arranged around the liquid crystal display 91, the deformation generated in the second housing 5 reaches the liquid crystal display 91 when a force is applied to the mobile phone 1. Can be suppressed. In other words, the liquid crystal display 91 is made of glass or the like and is weak against deformation. By preventing the transmission of force against the liquid crystal display 91, breakage such as cracking of the liquid crystal display 91 can be suppressed.

  A gap 10 is formed between a portion of the flexible printed circuit board 7 located on one side of the sheet metal member 21 and the one side of the sheet metal member 21. Thereby, it is possible to reduce the vibration generated in the electronic circuit 71 from being transmitted to one surface of the sheet metal member 21.

  The liquid crystal display 91 has a light emitting unit that generates light. The sheet metal member 21 is partially embedded in the housing, and a substrate supporting hole 25 and a resin molding fixing hole 24 are formed in an exposed portion from the housing. The elastic sheet 4 covers the substrate support hole 25 and the resin molding fixing hole 24. Thereby, it is possible to prevent light irradiated from the light irradiation unit of the liquid crystal display 91 from entering the second housing 5 in which the circuit board 6 is accommodated. That is, when the light enters the second casing 5, the second casing 5 is also the internal space of the rear case 11, and thus the light leaks to the rear case 11 side. And measures to prevent this are necessary. However, if the elastic sheet 4 blocks light, this measure is not necessary, which is advantageous.

  Further, the outer periphery of the sheet metal member 21 is embedded in the casing, and the casing is formed with an accommodation space for accommodating the circuit board 6 and the mounting component on one surface side of the sheet metal member 21. A liquid crystal display 91 is accommodated on the surface side of the sheet metal member 21, and a housing recess having an exposed portion at the bottom is formed from the housing of the sheet metal member 21. A fixing hole 24 and a substrate support hole 25 are formed at the time of resin molding and the elastic sheet 4 covers the fixing hole 24 and the substrate support hole 25 at the time of resin molding. ing. Due to the presence of the elastic sheet 4, vibration generated in the electronic circuit 71 is not easily transmitted to the sheet metal member 21 via the liquid crystal display 91. Thereby, it is possible to suppress the cellular phone 1 from vibrating and affecting the call. In addition, it is possible to suppress the deterioration of the parts constituting the mobile phone 1 due to the vibration of the mobile phone 1.

  The mounted components constitute a drive circuit for driving the liquid crystal display 91. As a result, electronic members (for example, capacitors) that are likely to be vibration sources can be concentrated on the flexible printed circuit board 7 instead of the circuit board 6. In addition, the vibration can be further suppressed by disposing the elastic sheet 4 so as not to transmit vibration to the sheet metal member 21.

  The elastic sheet 4 can shield the liquid crystal display 91 from electromagnetic waves from the inside of the mobile phone 1 or electromagnetic waves from the outside of the mobile phone 1 by imparting conductivity. If the sheet metal member 21 is grounded and the elastic sheet 4 is in contact with the sheet metal member 21, the elastic sheet 4 is also grounded. As a result, a countermeasure against blinding around the area where the liquid crystal display 91 is disposed is taken. In addition to being strengthened, noise generated from the liquid crystal display 91 itself can be released to the ground.

  In the above embodiment, the mobile phone 1 is an example of a portable electronic device of the present invention, the front case 2 and the rear case 11 are examples of a casing, the liquid crystal display 91 is an example of an electronic component, and is elastic. The sheet 4 is an example of an elastic member, and the substrate support hole 25 and the resin molding fixing hole 24 are examples of holes.

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

  The mobile electronic device is not limited to the mobile phone 1. For example, the portable electronic device may be a notebook computer, a PDA, a game machine, or a camera. The portable electronic device is not limited to a foldable type. The case may be an integrally configured case (only one case), or two or more cases may be connected to each other so as to be relatively movable by a method other than the folding type (sliding type, etc.) Also good.

  In the above embodiment, the sheet metal member 21 has the flexible printed circuit board through-hole 23, and the flexible printed circuit board 7 is passed through the hole. However, the edge of the sheet metal member 21 or a part of the front case 2 is notched, and the flexible printed circuit board 7. May be straddled. Moreover, a hole or a notch can be straddled as it is, without creating the front case 2 body or the sheet metal member 21.

  In the above embodiment, the sheet-like elastic sheet 4 formed from an elastic material is used. However, the sheet-like elastic sheet 4 is not necessarily formed and may be formed in other shapes. For example, the liquid crystal display 91 may be held by arranging a plurality of elastic members having a cylindrical shape and a prism shape.

  In the above embodiment, the front case 2 is integrally formed with the sheet metal member 21. However, the front case 2 is not necessarily formed integrally, and may be composed of another member. In that case, the front case 2 and the sheet metal member 21 are joined by a joining member such as a screw, an adhesive, or a double-sided tape.

  In the above embodiment, only the mounting component for driving the liquid crystal display 91 is disposed on the flexible printed circuit board 7, but even the mounting component irrelevant to the control of the liquid crystal display 91 is disposed on the flexible printed circuit board 7. It is possible. That is, it is possible to dispose the electronic member on which vibration is a problem in the mounting component used for the circuit board 6 on the flexible printed circuit board 7. As a result, the mounted components that vibrate are concentrated on the flexible printed circuit board 7 so that the circuit board 6 does not generate vibration, and the vibration generated on the flexible printed circuit board 7 is not transmitted to other parts by the elastic sheet 4. Can be.

1 is an external perspective view showing a mobile phone according to an embodiment of the present invention in an open state. FIG. 3 is a perspective view after a decorative sheet, a liquid crystal module 9 and the like are removed from the front case 2. The perspective view of the liquid crystal module 9. FIG. The perspective view which showed a mode that the liquid crystal module 9 was integrated in the front case 2. FIG. The perspective view which looked at the front case 2 from the exterior side. The enlarged perspective view which looked at the front case 2 from the inner side. VII-VII perspective sectional view of FIG. Sectional drawing which simplified the cross section in the VIII-VIII line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile phone (mobile electronic device), 2 ... Front case, 4 ... Elastic sheet, 6 ... Circuit board, 7 ... Flexible printed circuit board, 9 ... Liquid crystal module, 10 ... Gap, 21 ... Sheet metal member, 23 ... Flexible printed circuit board Through hole, 24 ... Fixed hole during resin molding, 25 ... Substrate support hole, 26 ... Fixed part, 41 ... Notch part, 61 ... Connector part, 71 ... Electronic circuit, 91 ... Liquid crystal display

Claims (6)

A housing,
A sheet metal member disposed inside the housing;
A circuit board disposed on one side of the sheet metal member;
An electronic component disposed on the other surface side of the sheet metal member;
A flexible printed circuit board disposed across the other surface side from the one surface side of the sheet metal member, and connected to the circuit board and the electronic component;
A mounting component mounted on the flexible printed circuit board, having an electronic circuit, and capable of causing vibration;
An elastic member for supporting the electronic component with respect to the sheet metal member;
Mobile electronic device having A gap is formed between a portion of the flexible printed circuit board located on the one surface side of the sheet metal member and the surface of the one side of the sheet metal member.
The portable electronic device according to claim 1. The electronic component has a light emitting unit for generating light,
The sheet metal member is partially embedded in the housing, and a hole is formed in an exposed portion from the housing.
The elastic member covers the hole,
The portable electronic device according to claim 1 or 2. The sheet metal member has an outer peripheral portion embedded in the housing,
The housing is formed with an accommodation space for accommodating the circuit board and the mounting component on the one surface side of the sheet metal member, and the electronic component is accommodated on the other surface side of the sheet metal member. An accommodation recess having a bottom portion exposed from the housing of the sheet metal member is formed,
The electronic component is a display device that displays an image on the side opposite to the sheet metal member,
A hole is formed in the exposed portion of the sheet metal member from the housing,
The elastic member covers the hole,
The portable electronic device according to claim 1 or 2. The mounting component constitutes a drive circuit for driving the electronic component.
The portable electronic device of any one of Claim 1 to 4. The elastic member has conductivity.
The portable electronic device of any one of Claim 1 to 5.

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