CN201509230U

CN201509230U - Mobile communication terminal keyboard

Info

Publication number: CN201509230U
Application number: CN2009201540213U
Authority: CN
Inventors: 杨永兴; 侯志强; 武超; 崔巧云
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2009-05-08
Filing date: 2009-05-08
Publication date: 2010-06-16
Anticipated expiration: 2019-05-08

Abstract

The utility model discloses a mobile communication terminal keyboard which has excellent backlight effect and can save energy consumption, comprising an upper keystroke layer, a middle light guide plate and a lower printed circuit board; an LED is located on the printed circuit board; the light guide plate leaves suitable space for the LED; keystroke holes are arranged at the position on the light guide plate corresponding to the keystrokes. The light guide plate is further provided with a plurality of cone-shaped reflecting surfaces; each cone-shaped reflecting surface is respectively located at the upper part of each LED for reflecting the emergent light at the upper part of the LED so that the emergent light can be transversely transmitted in the light guide plate, thereby arriving to each keystroke hole. The top angle of the cone-shaped reflecting surface is clung to the upper surface of the LED; the conical surface forms an angle of 45 DEG with the upper surface of the LED. The hole wall of the keystroke hole is annular cylinder-shaped for conveniently radiating the light outwards, thereby increasing the brightness of the keystrokes.

Description

A kind of mobile communication terminal keyboard

Technical field

The utility model relates to a kind of keyboard, relates in particular to a kind of mobile communication terminal keyboard.

Background technology

Along with the function that mobile communication terminal is integrated is more and more, the utilance of mobile communication terminal keyboard improves greatly, and customer requirements improves the accuracy and the efficient of the various information of input fast.In this case, the problem backlight of portable terminal keyboard has just shown especially.Generally by the PCB (Printed circuit board, printed circuit board (PCB)) of lower floor, top button and middle light guide plate constitute mobile communication terminal (for example mobile phone) keyboard structure at present.Leave transparent part on the button and be used for bright dipping, middle light guide plate is generally one deck leaded light paper, and LED (light-emitting diode, light-emitting diode) is welded on the PCB, and post on the PCB for dome-shaped sheet metal by key contacts, this sheet metal plays the effect of button connecting circuit conducting, and button is pressed once, and circuit turn-on once.

Present this kind mobile communication terminal keyboard structure that adopts, though simple in structure because LED has only upside and the left and right sides luminous, and the upside major part from directly over radiate, and do not gather the key hole place well, therefore caused the waste of luminous energy.Like this, consider the actual needs of mobile communication terminal keyboard, generally need 4 to 5 LEDs at least, caused the increase of keyboard manufacturing cost, and increased power consumption.

Thereby, design a kind of new leaded light evenly, the high mobile communication terminal keyboard structure of light utilization efficiency that goes out of LED is just necessitated.

The utility model content

The technical problems to be solved in the utility model provides a kind of mobile communication terminal keyboard, and this keyboard is higher to the utilance of LED bright dipping, has better light guide effect.

For solving the problems of the technologies described above, the utility model mobile communication terminal keyboard comprises top key layer, the light guide plate of centre and following printed circuit board (PCB), and LED is positioned on the described printed circuit board (PCB), and described light guide plate is that LED leaves suitable room; Have key hole with the corresponding position of button on the described light guide plate;

Described light guide plate also has several reflectings surface, and described reflecting surface lays respectively at the top of each LED, is used for the emergent light of this LED top is reflected, and it is propagated in light guide plate, thereby reach each key hole as far as possible.

In order to reach better reflecting effect, described each reflecting surface lay respectively at each LED directly over.

Described reflecting surface can be to cut groove on light guide plate top, plates reflecting coating at the upper surface of this groove then and forms.

The shape of described reflecting surface can be suitable for curved surface that the LED emergent light is reflected for conical, circular cone prismatic or other, and wherein taper shape is convenient to processing and fabricating most.When reflecting surface was taper shape, for obtaining better reflecting effect, the conical surface should become miter angle with the LED upper surface.

For reducing the thickness of described light guide plate, the drift angle of described reflecting surface should be close to the LED upper surface.

The shape of hole wall of described key hole can be the circular cylinder shape, adopts this shape to help luminous energy to external radiation, thereby increases the brightness of button, and helps saving luminous energy.

The beneficial effects of the utility model are:

The utility model portable terminal keyboard structure adopts a light guide plate, and the conical reflecting surface of design reflects the emergent light of LED upper surface on this light guide plate, makes it can horizontal transmission in the light-conductive media of light guide plate; Simultaneously, the key hole of design ring-shaped cylinder shape, thus reach better spotlight effect.By such design, the utility model has improved traditional cell phone keyboard inequality backlight greatly and has constrained to the vision that the user brings, and has saved energy consumption again, and can the radio-frequency performance of mobile communication terminal not exerted an influence.It is simple that the utility model also has manufacturing process, the advantage that reliability is high.

Description of drawings

Fig. 1 is LED illumination effect figure;

Fig. 2 is the conical reflective surface schematic diagram directly over the LED;

Fig. 3 (A) and Fig. 3 (B) are the ring-shaped cylinder shape design diagram of key hole;

Fig. 4 is the cell phone keyboard structural representation.

Description of reference numerals:

1 is LED, and 2 is the light-conductive media material, and 3 is conical reflecting surface, and 4 is ring-shaped cylinder, and 5 is PCB, and 6 is button.

Embodiment

Below in conjunction with the drawings and specific embodiments, and be that example is described in further detail the utility model with the cell phone keyboard structure.

The utility model adopts transparent dielectric material to make light guide plate, has the rectangular channel of respective numbers on the light guide plate according to the number of LED, and these rectangular channels are used for holding LED when light guide plate covers the last formation of PCB keyboard.Portable terminal keyboard of the present invention comprises several LED, and the number of LED is specifically as follows one, also can choose more than one according to actual conditions, and LED all is welded on the pcb board.

Consider that the luminous of LED have only upside and left and right sides leaded light, and the light of upside not from the button bright dipping, has caused the waste of luminous energy perpendicular to the non-key zone of keyboard.As shown in Figure 1, the most of energy of LED bright dipping from directly over radiate, the utility model is primarily aimed at also that this part luminous energy effectively utilizes, though the bright dipping of side can derive, very inhomogeneous.

The utility model designs reflective surface above LED for this reason, and promptly described reflecting surface reflects the emergent light of LED upper surface, and it can be propagated in light guide plate.In the present embodiment, this reflective surface is designed to taper shape, concrete grammar is to cut some cone-shaped grooves on the top of light guide plate, form some recessed conical surfaces like this, each conical surface lays respectively at directly over each LED, on each curved surface, plate reflecting coating then, be used for reflecting the light of LED upper surface.Conical drift angle is close to the LED upper surface to reduce the thickness of light guide plate, and the conical surface becomes miter angle with the LED upper surface, as shown in Figure 2.The emergent light of LED top just can be to evenly propagating all around in light guide plate through the reflection of this taper seat like this.

This luminous curved surface can also be designed to circular cone prismatic or other and be convenient to the curved surface that the emergent light to the LED top reflects, execution mode reference circle taper reflecting surface, cut the groove of respective shapes on light guide plate top, plate reflecting coating at the upper surface of groove then and get final product.

Key hole on the light guide plate is designed to the circular cylinder shape, and as shown in Figure 3, adopt this kind key hole shape to help luminous energy and gather the key hole place, thus the brightness of enhancing button, the while can also reduce the number of LED, helps energy-conservation.

Fig. 4 is the utility model cell phone keyboard structural representation, as shown in the figure, the utility model cell phone keyboard comprises three-decker, bottom one deck is PCB, post dome row metal sheet on the PCB, top one deck is a keyboard, middle one deck is a light guide plate, the reflection of the pyramid type camber reflection layer of its top of the luminous process of LED upper surface, light in the light guide plate transparent medium to the four sides horizontal infection, after arriving the ring-shaped cylinder body structure (being the key hole hole wall) of keyboard below, light just can polymerization, this position brightness increase, by the light transmission part on the button to external radiation, this structural improvement can realize effective utilization of LED luminous energy, reaches optically focused and even purpose backlight.

Above-described specific embodiment; the purpose of this utility model, technical scheme and beneficial effect are further described; should be understood that simultaneously; the utility model scope of asking for protection is illustrated in the appended claims; and can not be with the foregoing description of specification as restriction, within every conspicuous modification within aim of the present utility model protection range also of the present utility model due to.

Claims

1. mobile communication terminal keyboard, comprise top key layer, the light guide plate of centre and following printed circuit board (PCB), light-emitting diode is positioned on the described printed circuit board (PCB), described light guide plate is that light-emitting diode leaves suitable room, have key hole with the corresponding position of button on the described light guide plate, it is characterized in that:

Described light guide plate also has several reflectings surface, and described reflecting surface lays respectively at the top of each light-emitting diode, is used for the emergent light of this light-emitting diode top is reflected, and it can be transmitted in light guide plate, thereby reach each key hole as far as possible.

2. mobile communication terminal keyboard according to claim 1 is characterized in that:

Described each reflecting surface lay respectively at each light-emitting diode directly over.

3. mobile communication terminal keyboard according to claim 1 and 2 is characterized in that:

Described reflecting surface is conical reflecting surface.

4. mobile communication terminal keyboard according to claim 3 is characterized in that:

Described reflecting surface becomes miter angle with the light-emitting diode upper surface, and the drift angle of described reflecting surface is close to the light-emitting diode upper surface.

5. mobile communication terminal keyboard according to claim 3 is characterized in that:

The shape of hole wall of described key hole is the circular cylinder shape.

6. mobile communication terminal keyboard according to claim 1 and 2 is characterized in that:

Described reflecting surface is a circular cone prismatic reflecting surface.

7. mobile communication terminal keyboard according to claim 1 and 2 is characterized in that:

Described reflecting surface is to cut groove on light guide plate top, plates reflecting coating at the upper surface of this groove then and forms.

8. mobile communication terminal keyboard according to claim 1 and 2 is characterized in that:

The shape of hole wall of described key hole is the circular cylinder shape.