JP4547322B2 - Mobile communication device - Google Patents

Description

  The present invention relates to a structure of a mobile communication device having a display unit such as a mobile phone, and more particularly to a structure for fixing the display unit.

  2. Description of the Related Art Conventionally, mobile communication devices, particularly mobile phones, display information input by an input button or display unit (liquid crystal display unit, organic EL display, etc.) for displaying a message from a communication partner. Part, inorganic EL display part and other display part). The foldable mobile phone also has a sub liquid crystal display section so that the communication partner from the outside can be confirmed and the time of the clock can be confirmed in the folded state.

  A mobile phone is carried and used because it is carried, but it often falls to the floor or the ground unexpectedly. Dropping from a low position often only damages the appearance and does not affect performance, but if it falls from a high position or falls while running, it will collide violently with the floor and ground, and display on the substrate, LCD, etc. Cracks may occur in the part. Therefore, in order to improve the strength by providing ribs or the like inside the housing, or to make it light and small, in the internal structure, AZ91D which is a magnesium die cast product (mainly Al 9%, Zn 1%, The remaining Mg alloy is used to improve the strength.

  By the way, the main component of AZ91D is magnesium. Magnesium is next to sodium in seawater and is contained in an amount of 1.3 g per liter. Therefore, it is easy to obtain. Also, it is said that the ductility increases rapidly from about 300 ° C., and the workability is improved. As for the electrical properties, magnesium is eluted first when the potential is low and it is in direct contact with a dissimilar metal such as iron or aluminum. . In addition, vibration absorption is high, cutting resistance is small, easy to process, good dent resistance, good dimensional stability due to temperature change, good electromagnetic wave shielding in a wide frequency band, good weldability, harmless to human body, etc. Because it has many features, it is increasingly used in portable electronic devices and automobile parts.

  For example, in Patent Document 1, a corner portion between a boss projecting and formed on a crossing portion of a plurality of rows of lattice-like ribs provided in a portion supporting a cathode ray tube in a cabinet and a rib on a side in contact with the cathode ray tube is dropped. It is designed to prevent cracking and breakage due to impact.

Moreover, in patent document 2, in the housing | casing of a mobile communication apparatus, the structure which pinches | interposes an internal module with a front housing | casing and a back housing | casing is not taken, and the division | segmentation surface of a side is reduced significantly, and the side surface with respect to fall or external force The strength is ensured and no cushioning material is used, so the number of parts is reduced.
JP 2003-230075 A JP 2005-130327 A

  However, it is not always good to improve the strength of the periphery of the display part such as a liquid crystal display. If a buffer material is not used, cracks will occur in the delicate display part if an external impact is applied if the strength of the peripheral member is too high. There is a problem of doing.

  In view of the above problems, the present invention is to provide a frame structure of a portable communication device in which a crack is not generated in a display unit even when an external impact is applied.

  In order to achieve the above object, in the present invention, the display portion is held by the display portion holding rib of the reinforcing frame made of magnesium die cast.

  Specifically, in the first invention, a portable communication device having a display unit is assumed.

And it comprises a front and back split type display housing having a display window portion in which the display section is exposed on the front surface side housing,
A reinforcing frame made of magnesium die-cast is provided so as to contact the inner surface of the rear housing of the display housing,
The reinforcing frame has a display unit receiving recess for storing the display unit,
The display unit includes a display panel having a locking claw on the outer periphery for locking to a side wall of the display unit receiving recess of the reinforcing frame, and a display substrate attached to the back side of the display panel,
In the middle part in the longitudinal direction of the reinforcing frame, a display part holding rib is provided that protrudes from the bottom surface of the display part accommodating recess to the surface side and extends in the width direction.
In a state where the display panel is locked to the reinforcing frame with the locking claws, the display portion is in contact with the display portion holding rib.

  According to said structure, a display part is hold | maintained at the latching nail | claw of a display panel and a display part holding | maintenance rib by a rigid reinforcement frame, and hold | maintains a suitable clearance from the bottom face of the display part accommodation recessed part of a reinforcement frame. Therefore, even if an impact is applied from the outside, the reinforcement frame protects the impact and it is difficult for the impact to be transmitted to the display portion. Further, even if a reinforcing frame is mounted to increase the rigidity, the reinforcing frame is made of magnesium die cast and is lightweight, so that the volume of the display housing does not increase greatly and becomes lightweight. Further, since the rib for holding the display unit may be a thin rib, it is lightweight, and the volume of the display housing does not increase greatly, and it is lightweight. Examples of the display unit include a liquid crystal display unit and an organic EL display unit.

  In the second invention, the display unit is in contact with the display unit holding rib at both ends in the width direction.

  According to the above configuration, even if an impact is applied to the casing from the outside, the external force is not directly transmitted from the display unit holding rib to the central portion of the display unit, so that the display unit is not cracked.

  In the third invention, the display portion holding rib has an arc shape when viewed from the longitudinal direction of the reinforcing frame.

  According to said structure, the display part holding rib which does not transmit the force from the outside directly to the center part of a display part is formed easily.

  In the fourth invention, the display unit is a liquid crystal display unit.

  According to said structure, a liquid crystal display part is weak to an impact etc., and is effectively protected by the display part holding rib of this invention.

  In the fifth invention, the display unit is an organic EL display unit.

  According to said structure, since an organic electroluminescent display part does not require a backlight and can be made thin, portability improves. In addition, the organic EL display unit has extremely fast element movement, is strong in displaying moving images, and is bright and has a wide viewing angle, thereby improving convenience.

  In the sixth invention, the organic EL display unit is made of a low molecular material.

  According to the above configuration, the low molecular weight material has high efficiency and a long lifetime, and is suitable for portable communication devices.

  In the seventh invention, the organic EL display section is made of a polymer material.

  According to the above configuration, the polymer material can be applied by inkjet printing or the like, and has high productivity.

In the eighth invention, a sub display panel is provided on the opposite side of the display unit from the display panel,
A frame-side sub-display window is formed on the bottom surface of the display-unit receiving recess of the reinforcing frame, and a case-side sub-display window is formed on the back-side casing, from the casing-side sub-display window. The sub display panel is exposed.

  According to the above configuration, even if a sub display panel is provided on the back side of the display unit, this sub display panel is also protected by a rigid reinforcing frame. In addition, no cracks are generated in the sub display panel.

  In a ninth aspect of the invention, a frame side sub display window is provided on one side in the longitudinal direction of the reinforcing frame, and a speaker receiving window for receiving the speaker on the opposite side across the display holding rib. Is formed.

  According to said structure, the display part holding | maintenance rib is arrange | positioned in the position pinched | interposed into the display part and the speaker.

  In the tenth invention, the sub display panel is composed of an organic EL.

  According to the above configuration, since the sub display panel is generally used as an auxiliary small screen, it may be monochromatic. In such a case, a telephone number or the like is clearly displayed by the organic EL. Moreover, since the organic EL does not require a backlight, the degree of freedom of the installation position is high.

  In the eleventh aspect, the mobile communication device is a mobile phone.

  According to the above configuration, the size of the mobile phone is reduced to improve portability, while the screen of the display unit is also enlarged to improve the visibility of the screen. Even if an impact is applied, cracks do not occur in the display portion. In addition, the reinforcement frame enables the design of a lightweight and small mobile phone.

In a twelfth aspect of the invention, there is a foldable mobile phone,
The display casing and the other casing provided with the operation buttons are configured to be foldable and openable.

  According to the above configuration, even when an impact is applied from the outside due to dropping or the like in a state in which the foldable mobile phone is opened, the display portion holding rib does not cause cracks in the display portion. The reinforcement frame also allows the design of a lightweight, small thin foldable mobile phone.

  As described above, according to the present invention, it is possible to improve the strength of the display housing and reduce the influence of the impact on the weak display portion, so there is no need to provide a buffer material around the display portion. Lightweight and small product design is possible.

  In addition, by using an organic EL display unit as the display unit, the product can be made thinner, the display unit can be sharpened, and the product value can be greatly increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a foldable mobile phone 1 as a mobile communication device according to an embodiment of the present invention as viewed from the right. FIG. 2 is a perspective view of the closed state of the mobile phone 1 as viewed from the right.

  As shown in FIGS. 1 to 4, the mobile phone 1 of the present embodiment includes a first casing 2 as a display casing and a second casing 3 as another casing. These are rotatably connected by the hinge part 5.

  The said 1st housing | casing 2 is comprised by the front-and-back split type of the surface side housing | casing 2a and the back surface side housing | casing 2b. The front side housing 2a is provided with a liquid crystal display unit 4 and a receiving unit 6 as display units, and the back side housing 2b is provided with a sub liquid crystal display unit 10 as a sub display panel, an audio button 11, and a decoration window 14. Etc. are provided.

  The second casing 3 is provided with a transmitter section 7, an information input button 8, a function button 9 and the like, and a camera section 22, a battery cover 28 and the like on the back side.

  As shown in FIG. 4, the surface side housing 2 a has a display window 2 c through which the liquid crystal display unit 4 is exposed.

  The back side housing 2b is formed with a housing side sub display window 2d. A magnesium die-cast magnesium frame 16 as a reinforcing frame is provided on the inner surface of the rear housing 2b.

FIG. 5 is a perspective view of the back surface of the magnesium frame 16 shown in FIG. The magnesium frame 16 is made of AZ91D, is lightweight, very strong, and strong torsion, so that the thickness is thin. The magnesium frame 16 is provided with a display unit accommodating recess 16a for accommodating the liquid crystal display unit 4. A frame-side sub display window 24 for exposing the sub liquid crystal display unit 10 is provided on the bottom surface of the display unit receiving recess 16a. Thus, the sub liquid crystal display unit 10 is exposed from the frame side sub display window 24 and the housing side sub display window 2d.
In addition, a switch window 25 that exposes the audio button 11 is provided at the center in the vertical direction, and a speaker housing window portion 26 that exposes the speaker 19 is opened at the top (lower right in FIG. 5).

  As shown in FIG. 4, the liquid crystal display unit 4 includes a liquid crystal panel 30 as a display panel having a locking claw 30 a for locking to the side wall of the display unit receiving recess 16 a of the magnesium frame 16, And a display substrate 17 attached to the back side of the liquid crystal panel 30. The sub liquid crystal display unit 10 is provided on the opposite side of the liquid crystal display unit 4 from the liquid crystal panel 30.

  As shown in FIG. 5, a display portion holding rib 23 extending in the width direction is provided in the longitudinal middle portion of the magnesium frame 16. The liquid crystal panel 30 is locked to the magnesium frame 16 by a locking claw 30 a and is in contact with the display portion holding rib 23. That is, the display portion holding rib 23 has an arc shape when viewed from the longitudinal direction of the magnesium frame 16, protrudes from the display portion receiving recess 16a to the surface side, and has the lowest left and right center when viewed from the vertical direction. The central part is lowered in an arc shape so that the end part is the highest. Thus, the liquid crystal display unit 4 (display substrate 17) is in contact with the display unit holding rib 23 at both ends in the width direction.

  6 is a cross-sectional view taken along line VI-VI in FIG. In FIG. 6, the liquid crystal panel 30 and the backlight 33 are mounted on the front surface side (lower side in the figure) of the display substrate 17, and are coupled to the magnesium frame 16 by the locking claws 30 a of the liquid crystal panel 30. In a state sandwiched between the front surface side housing 2a and the back surface side housing 2b in a sandwich state, they are coupled by screws 27 shown in FIG. From both sides, a right side cabinet 20 and a left side cabinet 21 are incorporated as a joint strength improvement and decoration. A decorative cover 12 is affixed to the surface of the back-side housing 2b with a double-sided tape, and serves to protect the end of the liquid crystal panel 30 from dust and water.

-First housing assembly procedure-
Next, the assembly procedure of the first casing 2 will be described with reference to FIG.

  The decorative cover 12, the decorative 13, and the decorative window 14 are affixed to the back side housing 2 b from the front, and the right side cabinet 20 and the left side cabinet 21 are fitted and assembled from the side surfaces with attachment claws 29.

  Next, the audio button 11 and the sound leakage prevention cover 15 are pasted from the back side (assembly A1).

  Next, the speaker 19 is temporarily fixed to the front side housing 2a (assembly A2).

  A switch (not shown), a sub liquid crystal display unit 10 and the like are mounted on the display substrate 17 in advance on the back surface side, and a liquid crystal panel 30 (shown in FIG. 6) and the like are mounted on the front surface side in advance. The display substrate 17 and the magnesium frame 16 that are the substrate assembly are temporarily joined by the locking claws 30a of the liquid crystal panel 30 (assembly A3).

  By assembling the assemblies A1, A2 and A3 and connecting them with screws 27, the first housing 2 is completed.

-Weight drop test-
As a weight drop test, a columnar iron weight of about 100 g having a diameter of 21 mm and a height of 39 mm was dropped onto the liquid crystal panel 30 from a height of 1 m.

  7 and 8 show a magnesium frame 116 as Comparative Example 1. FIG. The only difference from the magnesium frame 16 of the embodiment is that there is no display portion holding rib 23.

  9 and 10 show a magnesium frame 216 as a second comparative example. The difference from the magnesium frame 16 of the embodiment is that the shape of the display portion holding rib 223 is different and is a long and thin rectangular shape when viewed from the longitudinal direction of the magnesium frame 16.

The results are shown below.
When the magnesium frame 16 of the present embodiment is used: the liquid crystal panel 30 and the display substrate 17 are not destroyed. When the magnesium frame 16 of the comparative example 1 is used: The liquid crystal panel 30 is destroyed. The magnesium frame 16 of the comparative example 2 is used. When used: The display substrate 17 was destroyed. From these results, it was found that the shape of the display portion holding rib 23 of this embodiment was optimal.

-Effect of the embodiment-
Therefore, according to the mobile phone 1 according to the present embodiment, the strength of the first housing 2 is improved by the display portion holding ribs 23 of the magnesium frame 16 and the impact on the liquid crystal display portion 4 having low strength is reduced. Since the influence is reduced, it is not necessary to provide a cushioning material around the liquid crystal display unit 4, and a lightweight and small product design is possible.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the display unit is a liquid crystal display unit, but an organic EL display unit may be used. Thus, the organic EL display unit does not require the backlight 33, can be made thin, and portability is improved. In addition, the organic EL display unit has extremely fast element movement, is strong in displaying moving images, and is bright and has a wide viewing angle, thereby improving convenience.

  Moreover, you may comprise an organic electroluminescent description part with a low molecular weight material. In this case, the low molecular weight material has high efficiency and a long lifetime, and is suitable for a portable communication device.

  Further, the organic EL display unit may be made of a polymer material. In this case, the polymer material can be applied by inkjet printing or the like, and productivity can be improved.

  Thus, by using the organic EL display unit as the display unit, the product can be made thinner, the display unit can be clearly displayed, and the product value can be greatly increased.

  In the above embodiment, the sub liquid crystal display unit 10 is provided, but the sub liquid crystal display unit 10 may be omitted. The sub liquid crystal display unit 10 as the sub display panel may be an organic EL display unit. At this time, since the sub display panel is generally used as an auxiliary small screen, it may be mono-colored. In such a case, the telephone number or the like can be clearly displayed by the organic EL. Moreover, since organic EL does not require the backlight 33, the freedom degree of an installation position can be raised.

  In the above embodiment, an example of a foldable mobile phone has been shown as the mobile communication device. However, the mobile phone may not be foldable, and the present invention can also be applied to a portable PHS, PC, mobile tool, or the like.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

  As described above, the present invention is useful for a mobile communication device having a liquid crystal display unit and an organic EL display unit such as a mobile phone.

It is a perspective view from the right direction which shows the open state of the mobile telephone which concerns on embodiment of this invention. It is a perspective view from the right direction which shows the closed state of a mobile telephone. It is a perspective view from the left direction which shows the open state of a mobile telephone. It is a perspective view of the mobile phone which decomposed | disassembled the 1st housing | casing part. It is a perspective view which shows the shape of a magnesium frame. It is the IV-IV sectional view taken on the line in FIG. It is a perspective view which shows the shape of the magnesium frame of the comparative example 1. FIG. 7 is a view corresponding to FIG. It is a perspective view which shows the shape of the magnesium frame of the comparative example 2. FIG. 7 is a view corresponding to FIG.

Explanation of symbols

1 Mobile phone (mobile communication equipment)
2 First housing (display housing)
2a Front side housing 2b Back side housing 2c Display window 2d Housing side sub display window 3 Second housing (other housing)
4 Liquid crystal display (display)
8 Information input buttons (operation buttons)
9 Function buttons (operation buttons)
10 Sub liquid crystal display (sub display panel)
16 Magnesium frame (reinforced frame)
16a Display part accommodating recess 17 Display substrate 19 Speaker 23 Display part holding rib 24 Frame side sub display window part 26 Speaker accommodating window part 30 Liquid crystal panel (display panel)
30a Locking claw 116 Magnesium frame 216 Magnesium frame 223 Display portion holding rib

Claims (2)

In a mobile communication device having a display unit,
A front and back split type display housing having a display window portion that exposes the display section on the front side housing,
A reinforcing frame made of magnesium die-cast is provided so as to contact the inner surface of the rear housing of the display housing,
The reinforcing frame has a display unit receiving recess for storing the display unit,
The display unit includes a display panel having a locking claw on the outer periphery for locking to a side wall of the display unit receiving recess of the reinforcing frame, and a display substrate attached to the back side of the display panel,
An arc-shaped display portion holding rib is provided at the intermediate portion in the longitudinal direction of the reinforcing frame, protruding from the bottom surface of the display portion receiving recess to the surface side and extending in the width direction as viewed from the longitudinal direction of the reinforcing frame .
In a state where the display panel is locked to the reinforcing frame by the locking claws, the display unit is in line contact with the display unit holding rib only at both ends in the width direction , and the display unit is bent even if the display unit is bent. A portable communication device , wherein the reinforcing frame is not in contact with any part other than both ends in the width direction . The mobile communication device according to claim 1 ,
A sub-display panel is provided on the opposite side of the display unit from the display panel.
A frame-side sub-display window is formed on the bottom surface of the display-unit receiving recess of the reinforcing frame, and a case-side sub-display window is formed on the back-side casing, from the casing-side sub-display window. A portable communication device, wherein the sub display panel is exposed.

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