CN201409152Y

CN201409152Y - Mobile terminal with dome keys

Info

Publication number: CN201409152Y
Application number: CN2009200052138U
Authority: CN
Inventors: 余宏发; 吴燕楠; 左显志
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-03-20
Filing date: 2009-03-20
Publication date: 2010-02-17
Anticipated expiration: 2019-03-20

Abstract

The utility model discloses a mobile terminal with dome keys, which comprises printed circuit boards, domes and a keyboard, the printed circuit boards are provided with key connecting fingers, the domes are attached on the key connecting fingers, the keyboard is placed on the domes, wherein an element-less area which is at least 2mm wide is arranged outside an outer ring of each key connecting finger, an inner ring of each key connecting finger is provided with a through hole close to the edge, and an annular insulating area without solder mask is arranged between the inner and the outer ringsof each key connecting finger. In the mobile terminal, the chance of polluting the key connecting fingers and the domes is reduced, consequently, the reliability of electric contact between the key connecting fingers and the domes is improved, the maintenance cost caused by the insensitivity of keys is reduced, and the satisfaction of use is increased.

Description

Portable terminal with dome button

Technical field

The utility model belongs to the mobile communication terminal technical field, relates in particular to the portable terminal of a kind of dome of having (being commonly called as " the young sheet of nest ") button.

Background technology

In the portable terminal product, in order to realize dialing and other business functions, the extensive use printed substrate (Printed Circuit Board is called for short PCB) and the cooperation of dome paster realize keypress function.Concrete matching relationship is as follows: arranged keys golden finger on pcb board, on the button golden finger, paste the dome paster again, and on the dome paster, place keyboard at last; By pushing keyboard, allow sheet metal on the dome paster contact or disconnect, and then realize button operation with the inner and outer rings of golden finger.

Portable terminals such as present mobile phone are in user's use, and dome paster and button golden finger cause dome paster and the loose contact of pcb board button golden finger easily by foreign substance pollution, thereby the ineffective phenomenon of button occurs.

The utility model content

The purpose of this utility model is to provide a kind of portable terminal of the dome of having button, by reducing dome paster and the contaminated probability of PCB, to solve the ineffective problem of button operation.

For this reason, the utility model provides a kind of portable terminal of the dome of having button, comprise: have the button golden finger printed substrate, be attached at the dome paster of each button golden finger and be positioned over keyboard on the dome paster, wherein, the outside of the outer shroud of button golden finger is the wide no device region of 2mm at least, is no green oil dead ring district between the outer shroud of button golden finger and the interior ring.

Preferably, the interior ring of above-mentioned button golden finger is provided with through hole, and this through hole is arranged near interior ring edge, and the diameter of described through hole is 0.2mm.

Preferably, the outside of the outer shroud of above-mentioned button golden finger is provided with the external insulation ring, and the width of external insulation ring is 0.1mm.

Preferably, the manual pad of above-mentioned printed substrate is apart from outer shroud 4mm at least.

Preferably, the instrument connection pad of above-mentioned printed substrate is apart from outer shroud 1.5mm at least.

Preferably, the LCD pad of above-mentioned printed substrate is apart from outer shroud 1.5mm at least.

Preferably, connect by cross structure between a plurality of jigsaw of above-mentioned formation printed substrate.

Preferably, have a plurality of salient points on the above-mentioned dome paster.

Preferably, above-mentioned portable terminal is a mobile phone.

In portable terminal of the present utility model, button golden finger and the contaminated probability of dome paster are lowered, thereby improved the reliability that button golden finger and dome paster electrically contact, reduced the ineffective caused maintenance cost of button, promoted user's satisfaction.

Be noted that the description and the following detailed description all are exemplary, being intended to provides further instruction to desired the utility model.

Except purpose described above, feature and advantage, the utility model also has other purpose, feature and advantage.Below with reference to figure, other purpose, feature and effect of the present utility model is described in further detail.

Description of drawings

Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part.Among the figure:

Fig. 1 shows the schematic construction of the button golden finger on the pcb board;

Fig. 2 shows button golden finger and the relation of the position between other pad on the pcb board;

Fig. 3 shows a kind of jigsaw connection diagram;

Fig. 4 shows the schematic diagram of the local A of jigsaw connection shown in Figure 3; And

Fig. 5 shows the schematic diagram of a dome paster.

Embodiment

Be described in detail below in conjunction with accompanying drawing and preferred embodiment portable terminal the dome of having button of the present utility model.

This portable terminal comprises: have button golden finger 100 printed substrate 10, be attached at the dome paster 20 (referring to Fig. 3) of each described button golden finger 100 and be positioned over keyboard (not shown) on the described dome paster, these structures all are known in those skilled in the art, do not give unnecessary details at this, the structure of the button golden finger on the pcb board is described below in conjunction with Fig. 1.

The interior ring 101 of button golden finger 100 is provided with submarginal through hole 102, can effectively prevent the pollution of foreign matters such as dust to the dome salient point.

Do not have through hole on the outer shroud 107 of button golden finger 100, have the wide no device region 106 of 2mm at least in the outside of outer shroud 107, the stickup that this no device region 106 helps the dome paster is enough tight, avoids the introducing of follow-up dust and other impurities.

For no green oil dead ring district 103, can prevent like this that the green oil ring is higher than interior ring surface and the dome salient point and the interior loop contacts that cause are bad between the outer shroud 107 of button golden finger 100 and the interior ring 101.Because of the inventor finds: green oil is a major reason that causes dome paster and the loose contact of golden finger pad in the long-time disengaging of using the back to be produced, and omits green oil and can't cause negative effect to the button golden finger.

The diameter of the through hole 102 on the interior ring 101 is preferably 0.2mm, and other counterbore on the pcb board and the diameter of via hole also are preferably 0.2mm, so that processing.

Also be provided with external insulation ring 105 outside outer shroud 101, this external insulation ring 105 is narrow more good more.Preferably, the width of external insulation ring 105 is 0.1mm.

In addition, the outer shroud 107 of button golden finger with the lead-in wire 104 via hole (not shown) that are connected, usually should be as far as possible away from the air flue (not shown), and outer shroud 107 around the through hole (not shown) usually should be away from button golden finger and air flue.

Fig. 2 shows button golden finger and the relation of the position between other pad on the pcb board.As shown in Figure 2,, should guarantee to be not less than 1.5mm apart from a and b between the pad, foreign substance pollution button golden fingers 100 such as rosin are arranged when preventing to weld when LCD (LCDs) pad 110 and instrument connection pad 120 occurring when closer apart from button golden finger 100.

For the manual pad on the pcb board, preferably be not less than 4mm apart from the distance of button golden finger, to prevent to pollute button golden finger 100.

Fig. 3 shows a kind of jigsaw connection diagram, and Fig. 4 shows the schematic diagram of the local A of jigsaw connection shown in Figure 3, and as shown in Figure 3 and Figure 4,

jigsaw

10A, 10B, 10C connect by the mode of cross structure, with the interrupted dust that causes that cuts of the milling cutter that reduces board separator.Use the mode of cross structure, be far smaller than traditional stamp hole connected mode at the dust that carries out bringing when jigsaw is separated.It will be appreciated by those skilled in the art that: concerning the homoatomic chain plate, the mode of preferred employing the " row of going up just pieces together entirely, following row is all-trans assembly " or the mode of " left bank is just pieced together entirely, right row is all-trans assembly ".

Fig. 5 shows the schematic diagram of a dome paster.As shown in Figure 5, on dome paster 20, have a plurality of salient points (201,202,203), salient point quantity increase the contact probability that can increase dome paster and button golden finger, significantly reduce the insensitive situation of button.Preferably, the quantity of salient point is 3～5.

It will be appreciated by those skilled in the art that portable terminal of the present utility model can be a mobile phone, also can be product such as the palmtop PC with other termination function.

By above setting as can be seen, in portable terminal of the present utility model, button golden finger and the contaminated probability of dome paster are lowered, thereby improved the reliability that button golden finger and dome paster electrically contact, reduce the ineffective caused maintenance cost of button, promoted user's satisfaction.

The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. portable terminal with dome button comprises: have the button golden finger printed substrate, be attached at the dome paster of each described button golden finger and be positioned over keyboard on the described dome paster, it is characterized in that,

The outside of the outer shroud of described button golden finger (107) is the wide no device region (106) of 2mm at least, the interior ring (101) of described button golden finger is provided with submarginal through hole (102), is no green oil dead ring district (103) between outer shroud of described button golden finger (107) and the interior ring (101).

2. the portable terminal with dome button according to claim 1 is characterized in that,

Described through hole (102) is arranged near 0.1mm place, interior ring edge.

3. the portable terminal with dome button according to claim 1 is characterized in that,

The outside of the outer shroud of described button golden finger (107) is provided with external insulation ring (105), and the width of described external insulation ring is 0.1mm.

4. the portable terminal with dome button according to claim 1 is characterized in that,

The manual pad described outer shroud of distance (107) of described printed substrate is 4mm at least.

5. the portable terminal with dome button according to claim 1 is characterized in that,

Instrument connection pad (120) the described outer shroud of distance (107) of described printed substrate is 1.5mm at least.

6. the portable terminal with dome button according to claim 1 is characterized in that,

LCD pad (110) the described outer shroud of distance (107) of described printed substrate is 1.5mm at least.

7. the portable terminal with dome button according to claim 1 is characterized in that,

Constitute between a plurality of jigsaw (10A, 10B, 10C) of described printed substrate and connect by cross structure.

8. the portable terminal with dome button according to claim 1 is characterized in that,

Have a plurality of salient points (201,202,203) on the described dome paster (20).

9. according to each described portable terminal in the claim 1 to 8, it is characterized in that described portable terminal is a mobile phone with dome button.