JP3716216B2 - Electronic device rear LCD fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for fixing a rear LCD of an electronic device, and more particularly to an electronic device including a rear liquid crystal display (front LCD) and a rear liquid crystal display (rear LCD) such as a mobile phone, and the like. The present invention relates to a rear LCD fixing structure of an electronic apparatus in which a guide rib for positioning the rear LCD is not involved.
[0002]
[Prior art]
For example, in electronic devices such as mobile phones and PHS (Personal Handyphone System) phones, miniaturization and weight reduction of less than 100 grams is required. Thinning is required. Mobile phones and PHS phones are equipped with a small LCD on the back as well as a large front LCD (Liquid Crystal Display) that displays settings, telephone numbers, etc., as multifunctional functions and built-in functions increase. There are models that display incoming / outgoing calls and clocks. In mobile phones and the like, it is necessary to design a housing in consideration of portability. However, in order to reduce the thickness of a housing having a rear LCD, considerations different from those of other models are necessary.
[0003]
FIG. 5 shows a conventional rear LCD fixing structure in an electronic apparatus having a rear LCD. A transparent front screen 22 is attached to a predetermined position of the front case 21, and a front LCD 23 is disposed inside the front screen 22. An LCD frame 24 is disposed inside the front case 21, and a rear cover 25 is attached to the back surface of the front case 21 so that the LCD frame 24 is inserted. The rear cover 25 is formed with an opening for disposing a transparent rear screen 26 and a step portion 25a (a rear screen pasting surface) for fixing the periphery of the rear screen 26. The back screen 26 is fixed to the step portion 25a with a double-sided adhesive tape or the like. The LCD frame 24 is provided with a guide rib 27 in a jetty shape so as to face the stepped portion 25a, and the back surface of the stepped portion 25a and the top of the guide rib 27 are in contact with each other through a dustproof cushion 28 which is a dustproof elastic member. ing. A rear LCD 28 is mounted on the LCD frame 24 facing the rear screen 26 so as to be positioned by the guide ribs 27. On the LCD frame 24, a printed wiring board 29 on which semiconductor parts such as a control unit and a radio unit are mounted is mounted.
[0004]
In the configuration of FIG. 5, the guide ribs 27 of the LCD frame 24 are arranged so as to be the back side of the pasting surface of the back screen 26, and the dustproof cushion 28 is provided so as to straddle the guide ribs 27 and the back LCD 28. The dustproof cushion 28 is pressed by the back surface of the step portion 25a (the back screen pasting surface) of the rear cover 25, so that a sealed structure is secured.
[0005]
[Problems to be solved by the invention]
However, according to the conventional rear LCD fixing structure, the guide rib 27 and the rear screen sticking surface (stepped portion 25a) are opposed to each other, and the dustproof cushion 28 is disposed between them. There is a limit to conversion.
[0006]
Further, when a load is applied from the rear screen 26 side, the guide rib 27 and the rear LCD 28 are pressed through the dustproof cushion 28, so that the front LCD 23 and the rear LCD 28 are easily damaged.
[0007]
Accordingly, an object of the present invention is to provide a rear LCD fixing structure for an electronic device that can protect the LCD even when a pressing load is applied in the thickness direction of the main body while reducing the thickness of the main body.
[0008]
[Means for Solving the Problems]
The present invention, in order to achieve the above object, the front case and the rear cover housing is formed by the guide member formed in a frame on one side of the frame disposed inside the housing while being positioned A rear LCD fixing structure of an electronic device, in which a rear liquid crystal display is mounted, and a rear screen is provided on the rear cover so as to face the rear liquid crystal display, wherein the guide member is connected to the rear screen and the rear cover. Provided is a rear LCD fixing structure for an electronic device, which is in a non-contact state both directly and indirectly.
[0009]
According to this structure, the guide ribs are not in direct contact with the back surfaces of the rear cover and the back screen, and are not in contact with each other indirectly (with a dustproof cushion or the like interposed). The load from is distributed, and the rear LCD and the front LCD can be prevented from being damaged. Further, since the dustproof cushion is not provided at the upper end of the guide rib, it is possible to reduce the thickness and weight by [the thickness of the rear screen pasting surface + the dustproof cushion].
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a rear LCD fixing structure of an electronic apparatus according to the present invention. FIG. 2 shows a main part of the rear LCD fixing structure of FIG. In the following, a foldable mobile phone will be described as an electronic device, and only an upper housing having a structure different from that of the conventional case is illustrated, and a lower case that is not different from the conventional structure is not illustrated. Further, various components are mounted on the LCD frame and the printed wiring board, but most of them are not shown here.
[0011]
As shown in FIG. 1, the front case 1 of the upper casing has a front LCD display portion, and a front screen 2 made of transparent plastic is attached to the front LCD display portion with a double-sided adhesive tape or the like. The LCD frame 3 disposed inside the front case 1 includes a front LCD mounting portion (lower side in FIG. 1) and a rear LCD mounting portion (upper side in FIG. 1), and the rear LCD mounting portion has a thickness of the rear LCD 6. A guide rib 4 (guide member) having a height higher than that is provided. The guide rib 4 has, for example, an L shape, and the rear LCD 6 is positioned inside thereof. The rear cover 7 fitted to the front case 1 is formed with a rear screen pasting surface 8 on which a rear screen 9 made of transparent plastic is pasted. The back screen pasting surface 8 is formed to have a step corresponding to the thickness of the back screen 9. A printed wiring board 10 on which semiconductor parts such as a control unit and a radio unit are mounted is mounted on the back surface of the LCD frame 3.
[0012]
As shown in FIG. 2, a dustproof cushion 11 made of sponge, soft rubber or the like is disposed between the end portion of the guide rib 4 (upper end in FIG. 2) and the back surface of the rear LCD 6. A dustproof cushion 12 is disposed between the LCD frame 3 and the front screen attaching surface 1 a of the front screen 2 of the front case 1.
[0013]
As shown in FIG. 1, electrical connection between the printed wiring board 10 and the front LCD 5 is performed using a flexible board 13. Further, the connection with the lower housing is performed via the hinge portion 14. Reference numeral 3a denotes a speaker mounting portion, and 3b and 3c denote mounted electronic components.
[0014]
As described above, a space is formed between the guide rib 4 and the back surface (back surface) of the back screen 9 because it is not directly or indirectly contacted, and the dustproof cushion 11 is formed on the guide rib 4. Even if an external pressure is applied to the rear screen 9 (or the rear cover 7 in the vicinity thereof), a certain amount of pressure is applied to the rear LCD 6 via the dustproof cushion 11, but a higher pressure than that is applied. When added, the back surface of the back screen 9 comes into contact with the guide rib 4 to stop the change of the back screen 9 (or the rear cover 7 in the vicinity thereof), so the load from the back screen 9 side is dispersed. For this reason, there is no possibility that the rear LCD 6 and the front LCD 5 are damaged as in the prior art.
[0015]
Furthermore, the guide rib 4 and the rear screen sticking surface 8 are shifted in position on the plane (positional relationship without overlapping), and the dustproof cushion 11 is not interposed between them, so that the thickness can be reduced. For example, when the thickness of the dustproof cushion 11 is 0.4 mm, in the conventional structure, the thickness of the double-sided adhesive tape is 0.15 mm + the thickness of the rear screen application surface 8 is 0.7 mm + the thickness of the dustproof cushion 11 is 0.4 mm = 1.25 mm. In contrast to the distance from the back surface of the back screen 9 to the top surface of the back LCD 6, in the present embodiment, as can be seen from FIG. That is, a reduction of 1.25 mm−0.4 mm = 0.85 mm is possible, and the thickness can be reduced accordingly.
[0016]
Further, according to the embodiment of the present invention, the degree of freedom in design can be improved. In mobile phones, design design is performed in such a way that the minimum shape is fleshed out. Therefore, since the smaller and thinner casing structure can be attached without making the top surface R or the like extremely large, the range of selection for the design is widened. That is, the degree of freedom in design can be improved.
[0017]
3 and 4 show an entire disassembled state of the electronic apparatus (here, a mobile phone) of the present invention, FIG. 3 shows the front case 1 side, and FIG. 4 shows the rear cover 7 side. The assembly procedure will be described. First, as shown in FIG. 3, the front LCD 5 is attached to the LCD frame 3, and the rear LCD 6 and the printed wiring board 10 are attached to the opposite surface as shown in FIG. Next, the LCD frame 3 in a state of being assembled in a unit shape is attached to the front case 1 in this way. Next, the rear cover 7 provided with the antenna 15 is fitted into the front case 1. At this time, the guide rib 4 on the LCD frame 3 and the rear LCD 6 are separated from the rear surface of the rear screen 9 and have a dimensional relationship with clearance to the rear surface of the rear screen 9. In this state, the dust-proof cushion 11 is disposed on the periphery of the surface of the rear LCD 6 through the rear LCD opening provided in the rear cover 7 (the rear screen 9 is not yet mounted). Thereafter, the rear screen 9 is affixed to the rear screen affixing surface 8 of the rear cover 7. Further, as shown in FIG. 3, the front screen 2 is attached to the front screen attaching surface 1 a of the front case 1 using a double-sided adhesive tape (not shown).
[0018]
In the above embodiment, the dustproof cushion 11 is provided on the inner side (upper surface of the rear LCD 6) of the guide rib 4, but on the outer side (between the rear screen pasting surface 8 and the printed wiring board 10 or between the rear surface of the rear cover 7 and the printed wiring board 10. (Between). Alternatively, the dustproof cushion 11 can be omitted. Further, the rear LCD 6 may be a separate unit and assembled to the LCD frame 3 or the printed wiring board 10.
[0019]
Further, in the present embodiment, since the dustproof cushion 11 is not provided on the upper portion of the guide rib 4, the guide rib 4 is provided when the clearance in the plane direction between the end surface of the rear LCD 6 and the end surface of the rear screen attaching surface 8 can be accurately taken. It can be lowered to such an extent that the positioning of the rear LCD 6 is not hindered. Alternatively, when the positioning of the rear LCD 6 can be ensured by other means, the guide rib 4 can be omitted. Further, the guide member is not limited to the guide rib 4. In addition to such a rib structure, the guide member may be, for example, a protrusion (a wide jetty shape or a narrow convex portion), or a plurality of pins. Good.
[0020]
In the above embodiment, the rear cover 7 is provided with the rear screen attaching surface 8 in a step shape and the rear screen 9 is mounted. However, the rear screen attaching surface 8 is not formed in a step shape and is opened on the rear cover 7. Alternatively, the rear screen 9 may be mounted by providing only the above. In this case, the guide rib 4 can be formed so as to be positioned on the back surface of the rear cover 7.
[0021]
Furthermore, in the above-described embodiment, a foldable mobile phone has been described as an electronic device. Needless to say, the mobile phone can be applied to a straight type as well as a foldable type. Electronic devices are not limited to mobile phones and PHS. For example, a PDA (Personal Digital Assistant) device, a portable portable radio device, a portable measuring instrument (such as a tester) equipped with a liquid crystal display, etc. It is also applicable to.
[0022]
【The invention's effect】
As is clear from the above, according to the rear LCD fixing structure of the present invention, the guide member is not directly and indirectly in contact with either the rear cover or the rear screen. Is not directly applied to the guide member, so that the rear LCD or the front LCD can be prevented from being damaged. Further, since the dustproof cushion is not provided at the upper end of the guide member, the thickness of the main body can be reduced, and the thickness and weight can be reduced. Moreover, the freedom degree of design can be improved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a rear LCD fixing structure of an electronic device according to the present invention.
2 is a cross-sectional view showing a main part of the rear LCD fixing structure of FIG. 1. FIG.
FIG. 3 is an exploded perspective view showing an assembly procedure on the front case side.
FIG. 4 is an exploded perspective view showing an assembly procedure on the rear cover 7 side.
FIG. 5 is a cross-sectional view showing a main part of a rear LCD fixing structure of a conventional electronic device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front case 1a Front screen sticking surface 2 Front screen 3 LCD frame 3a Speaker mounting part 3b, 3c Electronic component 4 Guide rib 5 Front LCD
6 Rear LCD
7 Rear Cover 8 Rear Screen Attaching Surface 9 Rear Screen 10 Printed Wiring Board 11 Dustproof Cushion 12 Dustproof Cushion 13 Flexible Board 14 Hinge Part 15 Antenna 21 Front Case 22 Front Screen 23 Front LCD
24 LCD frame 25 Rear cover 25a Stepped portion (rear surface screen pasting surface)
26 Back screen 27 Guide rib 28 Dust-proof cushion 29 Printed wiring board

Claims (4)

The front case and the rear cover housing is formed, the rear liquid crystal display device on one side of the frame disposed inside the housing in a state of being positioned by a guide member formed on the frame is mounted, the rear liquid crystal display A rear LCD fixing structure of an electronic device in which a rear screen is provided on the rear cover so as to face a container,
The structure for fixing a rear LCD of an electronic device, wherein the guide member is in a non-contact state directly or indirectly with respect to the rear screen and the rear cover.   2. The rear LCD fixing structure for an electronic device according to claim 1, wherein an elastic member for dust prevention is disposed between a peripheral portion of the rear LCD and a rear surface of the rear screen.   2. The rear LCD structure of an electronic device according to claim 1, wherein the guide member is formed in the vicinity of an edge of a pasting surface of the rear screen of the rear cover. 4. The rear LCD structure for an electronic device according to claim 1, wherein the guide member is a rib structure, a protrusion, or a pin.

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