CN1866438A - Keypad and keypad assembly - Google Patents

Keypad and keypad assembly Download PDF

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Publication number
CN1866438A
CN1866438A CNA2005101340976A CN200510134097A CN1866438A CN 1866438 A CN1866438 A CN 1866438A CN A2005101340976 A CNA2005101340976 A CN A2005101340976A CN 200510134097 A CN200510134097 A CN 200510134097A CN 1866438 A CN1866438 A CN 1866438A
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CN
China
Prior art keywords
guide plate
light guide
keyboard
light
film
Prior art date
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Granted
Application number
CNA2005101340976A
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Chinese (zh)
Other versions
CN100470702C (en
Inventor
李周勋
郑善太
金京濂
赵炳德
张东薰
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of CN1866438A publication Critical patent/CN1866438A/en
Application granted granted Critical
Publication of CN100470702C publication Critical patent/CN100470702C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/036—Light emitting elements
    • H01H2219/044—Edge lighting of layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/056—Diffuser; Uneven surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • H01H2219/062—Light conductor

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  • Push-Button Switches (AREA)

Abstract

A keypad includes a light guide panel, the interior of which light propagates through, a film positioned on the upper surface of the light guide panel and having at least one key button positioned on the upper surface thereof, and at least one reflective pattern fixedly positioned with respect to the light guide panel to reflect a part of the light, which propagates through the interior of the light guide panel, towards the key button.

Description

Keyboard and keyboard components
Technical field
The present invention relates to a kind of keyboard that is used for portable terminal, more particularly, relate to a kind of keyboard and keyboard components with light guide plate.
Background technology
The keyboard that is used for portable terminal has usually: resilient sleeper-bearing; Be formed at a plurality of buttons of resilient sleeper-bearing upper surface, the upper surface of each button is printed on character respectively; And be formed at a plurality of projectioies (or actuator) on the resilient sleeper-bearing lower surface.The portable terminal of this type has about 15-20 the light-emitting device backlight that keyboard is provided usually.
Fig. 1 is for describing the cutaway view according to the keyboard components of prior art.As shown in the figure, keyboard components 100 comprises keyboard 110, switchboard 150 and a plurality of light-emitting diode (LED) 170.
Keyboard 110 comprises: tabular resilient sleeper-bearing 120; Be formed at a plurality of buttons 140 on the resilient sleeper-bearing upper surface, the upper surface of each button 140 is printed on character, numeral etc. respectively; And being formed at a plurality of protruding 130 on resilient sleeper-bearing 120 lower surfaces 124, lower surface 124 is relative with the upper surface 122 of resilient sleeper-bearing 120.Each projection 130 is alignd with the core of corresponding button 140.Resilient sleeper-bearing 120 has a plurality of grooves 126 that are formed on its lower surface 124.Groove 126 be in respective bump 130 around to prevent that LED170 and projection from 130 interfering.
This switchboard 150 has tabular PCB (printed circuit board (PCB)) 155 and is formed at a plurality of switches 160 on the upper surface of keyboard 110 of PCB155.Each switch 160 comprises conductive contact member 162 and covers the conduction dome 164 of contact component 162 fully.
A plurality of LED170 are installed on the upper surface of PCB155, and each LED170 is oriented to and can be covered by the corresponding groove 126 of resilient sleeper-bearing 120.
When the user pushed one of them button 140, the part that is positioned under the button 140 that is pressed of keyboard 110 was out of shape towards switchboard 150.As a result, push corresponding dome 164 corresponding to a projection 130 of crushed element, thus provide and corresponding contact component 162 between electrically contact.
Because the operation of nigh switch 160, LED170 can't be arranged at corresponding button 140 below.The light that sends from each LED170 illuminates each button 140 through resilient sleeper-bearing 120 with the angle of inclination.As a result, button is illuminated in a kind of uneven mode unintelligiblely.Especially, the center of each button 140 seems darker, and its periphery is then brighter.If the uniformity that more LED improves button 140 brightness is installed, will increases electric power and expend and manufacturing cost.
Summary of the invention
Therefore, obtained the present invention and solved the problems referred to above that occur in the prior art, and realized height and brightness uniformly, have low energy consumption and keyboard and keyboard components cheaply simultaneously by providing a kind of, and the advantage that obtains adding.
In one embodiment, provide a kind of keyboard, this keyboard comprises: light guide plate, and light can be at this light guide plate internal communication; Film, this film are located on the upper surface of light guide plate and the upper surface of this film is provided with at least one button; And at least one reflection graphic patterns, this reflection graphic patterns is located to pass through a part of light of light guide plate internal communication towards the button reflection regularly with respect to light guide plate.
In another embodiment, provide a kind of keyboard components, this keyboard components comprises keyboard, and this keyboard has: light guide plate, light portion are within it propagated; And film, this film is located on the upper surface of light guide plate and the upper surface of this film is provided with at least one button; And switchboard, this switchboard has at least one and is formed at its switch on the upper surface of keyboard, wherein when button is pressed, and the part push switch towards the switchboard distortion of keyboard.
In another embodiment, provide a kind of portable terminal, this portable terminal comprises: switchboard, this switchboard have at least one lip-deep switch provided thereon; Keyboard with light guide plate, this light guide plate has upper surface, lower surface and side surface; And at least one light-emitting device, this light-emitting device is oriented at least one side surface near light guide plate, wherein this keyboard comprises film, this film is positioned on the upper surface of light guide plate and the upper surface of this film is provided with at least one button, and comprise at least one reflection graphic patterns, this reflection graphic patterns is formed on the light guide plate partly, to pass through a part of light of light guide plate internal communication towards the button reflection.
Description of drawings
By the detailed description of lower surface connection accompanying drawing, above-mentioned each feature and advantage of the present invention will be more obvious.Wherein:
Fig. 1 is for describing the cutaway view according to the keyboard components of prior art;
Fig. 2 is for describing the cutaway view according to the keyboard components of first embodiment of the invention;
Fig. 3 is the top view of the part of the keyboard components among the concise and to the point Fig. 2 of description;
Fig. 4 is the concise and to the point top view of describing according to the keyboard components of second embodiment of the invention;
Fig. 5 is for describing the top view of an example that contrasts with second embodiment of the invention.
Embodiment
Below, various embodiments of the present invention will be described with reference to the drawings.For clarity and conciseness, the detailed description about known function and structure that links therewith is omitted, to avoid making purport of the present invention become unclear.
Fig. 2 is for describing the cutaway view according to the keyboard components of first embodiment of the invention, and Fig. 3 is the concise and to the point top view of describing the part of keyboard components.
Referring to Fig. 2, keyboard components 200 comprises keyboard 210, the switchboard 250 towards keyboard 210, at least one light-emitting device 290 and the 2nd PCB280.
Keyboard 210 comprises light guide plate 220, film 247, a plurality of button 245, a plurality of protruding 240 and a plurality of reflection graphic patterns 230 (being illustrated by solid (solid) triangle).
Light guide plate 220 guiding are coupled in the light of the inside of light guide plate.This coupling light is propagated to opposite side surfaces from a side surface of light guide plate 220.This light guide plate can have Any shape, such as square.Owing on the interface between light guide plate and the outside air layer total reflection is taking place, the light that is coupled in light guide plate 220 inside is at the light guide plate internal communication.Light guide plate has elasticity, so that button 245 can return back to initial position after pushing.That is, light guide plate 220 has self-healing property, like this, its can return to original shape after the distortion and will operate after button 245 be returned to initial position.
The tradition light guide plate is made by injection molding technique by Merlon (polycarbonate) that visible light is had high light transmittance or propenyl (acryl-based) resin.They have low elasticity coefficient, extremely low memory and high rigidity.This makes it be difficult to obtain the good sensation of knocking when pressing button.Equally, when pushing a button, contiguous button might be by operation (interfering between each button) mistakenly together.In addition, be easy to generate permanent deformation after the repeatable operation.
Therefore, light guide plate 220 according to the present invention is made by the high transparent elastomeric material, preferably make by polyurethane (polyurethane) or polysiloxanes (silicone), they have soft, high elastic coefficient, excellent elasticity nerve and high optical transmittance, knock sensation to provide good, eliminate the interference between each button 245, even and after repeatable operation, also can avoid permanent deformation.
Film 247 is located at the upper surface of light guide plate 220, and has a plurality of buttons 245 of being located on the film upper surface.The periphery of film 247 is connected to the periphery of light guide plate 220 with adhering part 249, with constraint between film 247 and light guide plate 220 and keep a upper air layer.Equally, have a bottom air layer below light guide plate 220, this bottom air layer prevents from be used to illuminate the light of button 245, leaks via adhering part 249.Because total reflection, light is being propagated between each interface between light guide plate 220 and the upper and lower part air layer.If the total reflection condition at the interface between light guide plate 220 and adhering part 249 does not keep, then unnecessary leakage of light can take place.Because the light that is not used to illuminate the remainder of button 245 arrives the periphery of light guide plate 220, this adhering part 249 preferably is located at the periphery of light guide plate 220.Film 247 preferably has such surface property, that is: it is not connected with the upper surface of light guide plate 220, because if the center which is provided with the film 247 of button fits in the upper surface of light guide plate 220, can't between light guide plate 220 and film 247, keep air layer.For this reason, the surface of film 247 can be made into matsurface or applies antitack agent, so that this surface is smooth.In addition, the part that is not provided with button 245 of the upper surface of film 247 can be printed to prevent that light from sending from the part outside the button 245.
Film 247 can be made by the high transparent elastomeric material, is preferably made by polyurethane or polysiloxanes, and they have soft, high elastic coefficient, excellent elasticity nerve and high optical transmittance.
When whole film 247 is connected in the upper surface of light guide plate 220, the refractive index of film 247 is configured to be lower than the refractive index of light guide plate 220 and the joint face of film (or lower surface) and is printed or is coated with and be covered with a coating, this coating is made by the material with high reflectance, so that unnecessary light losing minimizes.
A plurality of buttons 245 are located at the upper surface of film 247, and the upper surface of each button 245 is printed on character, numeral etc. respectively.Each button 245 can be connected in the upper surface of film 247 by corresponding adhering part, perhaps forms as a whole with film 247.Each button 245 can perhaps be made by Merlon or propenyl resin by making with film 247 identical materials.Each button 245 can be Any shape, such as cylindrical or elliptical cylinder-shape.
A plurality of protruding 240 are formed on the lower surface 224 of light guide plate 220, and this lower surface is relative with the upper surface 222 of light guide plate 220.This projection 240 can be by forming as one with identical or different material and the light guide plate 220 of light guide plate 220.Perhaps, this projection 240 can form and be connected in the lower surface 224 of light guide plate 220 separately.Each projection 240 can have arbitrary shape, such as truncated cone shape or trapezoidal hexahedron.Each projection 240 alignment below the corresponding button 245 (in the vertical direction of the upper surface of the thickness direction of keyboard components 200 or a PCB260).
Keyboard 210 has a plurality of reflection graphic patterns 230 that are formed on light guide plate 220 lower surfaces, to be reflected in a part of light of propagating in the light guide plate 220 towards corresponding button 245 respectively.If necessary, each reflection graphic patterns 230 can be formed on the upper surface of light guide plate 220, perhaps is located between light guide plate 220 and the corresponding projection 240.Each reflection graphic patterns 230 be formed at protruding 240 places and around the projection 240, this projection 240 be located at just the corresponding button 245 below, to illuminate button equably.In whole keyboard 210, the density of the reflection graphic patterns that close light-emitting device 290 is provided with or size are different from the density or the size of the reflection graphic patterns that is provided with away from light-emitting device 290.Do the overall distribution that is intended to regulate equably the light quantity of sending from the upside of light guide plate 220 like this, no matter and from the distance of the distance of light-emitting device 290.For example, when the light quantity of sending from the position of adjacent luminaires 290 was big, then the density of the reflection graphic patterns of adjacent luminaires 290 was configured to lower.When from the light quantity sent away from the position of light-emitting device hour, then the density away from the reflection graphic patterns of light-emitting device 290 is configured to higher.In this way, the light quantity distribution of the light that appears, the especially Luminance Distribution of the integral body of button 245 can become and evenly become clear.
The core 232 of each reflection graphic patterns 230 is formed on corresponding protruding 240 the lower surface, and the periphery 234 of each reflection graphic patterns 230 forms around projection 240.As shown in the figure, the light of light guide plate 220 incides on the reflection graphic patterns 230 owing to total reflection is propagated into.Great majority are reflected pattern 230 diffuse reflections outside the light of button 245 can not satisfy the condition (incidence angle is less than critical angle) of total reflection and pass film 247 and button 245 arrives accordingly.In addition, pass reflection graphic patterns 230 and the part diffuse light that irreflexive light do not take place and satisfy total reflection condition, in light guide plate 220, propagate constantly and help to illuminate other button.In this way, each reflection graphic patterns 230 causes diffuse reflection and only illuminates corresponding button 245 with a part of incident ray, and remaining light is used for illuminating other buttons.Moreover by the diffuse reflection of any direction, reflection graphic patterns 230 provides the uniform brightness of button 245.Preferably, reflection graphic patterns 230 can form by delineation or printing.
Switchboard 250 comprises a PCB260 and dome thin slice 270.
The one PCB260 has a plurality of lip-deep conductive contact members 265 formed thereon, and this conductive contact member 265 forms switch 265 and 275 with corresponding dome 275. Switch 265 and 275 alignment below corresponding projection 240.
Dome thin slice 270 is connected in the upper surface of a PCB260 and has a plurality of hemisphere domes 275, and this hemisphere dome 275 covers corresponding contact component 265 fully.
When the user pushed one of them button 245, the part that is positioned under the button 245 that is pressed of keyboard 210 was out of shape towards switchboard 250.As a result, push corresponding dome 275 corresponding to a projection 240 of crushed element, next this dome 275 is realized electrically contacting with corresponding contact component 265.When light guide plate 220 was made by elastomeric material, light guide plate 220 has tacky surfaces thereby dome 275 tends to be connected with the lower surface of light guide plate 220.Therefore, roughened can be carried out in the surface of each dome 275, or applies antitack agent, so that this surface becomes smooth.
The 2nd PCB280 is connected in the periphery of the lower surface 224 of light guide plate 220.Light-emitting device 290 is installed on the upper surface of the 2nd PCB280, and the light-emitting area of this light-emitting device 280 is towards the side surface of light guide plate 220.The inside that the light that sends from light-emitting device by this side surface is coupled to light guide plate 220.The 2nd PCB280 can be made by traditional flexible PCB (FPCB), and light-emitting device can be traditional LED.
In the present invention, the 2nd PCB280 can be removed, and the periphery of light guide plate 220 can wedge shape extend to the upper surface of a PCB260 obliquely.Light-emitting device 290 then is installed in the upper surface of a PCB260.
As selection, the 2nd PCB280 can be removed, and the periphery of light guide plate 220 can be bent so that it extends the upper surface to a PCB260.Light-emitting device 290 then is installed in the upper surface of a PCB260.
Fig. 4 is the top view of concise and to the point description according to the part of the keyboard components of second embodiment of the invention, and Fig. 5 is a top view of describing the reference examples of the advantage that second embodiment of the invention is shown.Except this keyboard components had the diffusing member 330 that is positioned at light guide plate 220 ' side surface, this keyboard components had the structure same with keyboard components shown in Fig. 2.Therefore, the description that provided same reference number and omitted repetition of same parts is to avoid lengthy and tedious.
In Fig. 5, film 247 is removed from amplifier section A (by the dotted line delineation), to help to understand better the present invention.As shown in the figure, the light that sends from light-emitting device 290 is coupled to light guide plate 220 inside by the side surface of light guide plate 220.Each light-emitting device 290 has the predetermined angle of departure, like this on the both sides of each light-emitting device 290, has produced the shadow region 310 that does not have light to shine.
Return Fig. 4, film 247 is removed from amplifier section B (by the dotted line delineation), to help to understand the present invention.As shown in the figure, light guide plate 220 ' has the zigzag diffusing member 330 of being located at its side surface.Diffusing member 330 has prismatic array structure and towards light-emitting device 290.Therefore, be mapped to light on the diffusing member 330 by diffusing member 330 diffusions, and reach the identical effect of effect that is had when having the wide angle of departure with light-emitting device 290 from what each light-emitting device 290 sent.As a result, the shadow region 320 that is positioned at each light-emitting device 290 both sides is greatly reduced.Diffusing member 330 makes whole keyboard 210 ' when obtaining more uniform luminance shadow region 320 be minimized becomes possibility, even also be like this when the side surface of light-emitting device 290 contiguous luminous plaques 220 ' is provided with.
As mentioned above, the advantage according to keyboard of the present invention and keyboard components is: the elasticity light guide plate that is arranged between button and the projection makes the number, reduction power consumption and the manufacturing cost that illuminate button equably and brightly and reduce light-emitting device become possibility.
Although the present invention is shown by some preferred embodiment and describes, be understandable that those skilled in the art can not break away from the spirit and scope of the present invention are made various forms and details to the present invention change.The spirit and scope of the present invention are defined by the claims.

Claims (28)

1, a kind of keyboard comprises:
The light guide plate that supplies light to propagate therein;
Be located at the film on the upper surface of light guide plate, have at least one button on the upper surface of this film; And
At least one reflection graphic patterns, this reflection graphic patterns is located to pass through a part of light of light guide plate internal communication towards the button reflection regularly with respect to light guide plate.
2, keyboard as claimed in claim 1, wherein film is made by transparent elastic material.
3, keyboard as claimed in claim 2, wherein film is made by polyurethane or polysiloxanes.
4, keyboard as claimed in claim 1, wherein film is connected in the upper surface of light guide plate by adhering part.
5, keyboard as claimed in claim 4, wherein the periphery of film is connected in the periphery of light guide plate.
6, keyboard as claimed in claim 5 wherein has air layer between the core of film and light guide plate.
7, keyboard as claimed in claim 1, wherein at least one reflection graphic patterns is formed on the light guide plate partly.
8, keyboard as claimed in claim 1, wherein light guide plate is made by transparent elastic material.
9, keyboard as claimed in claim 8, wherein light guide plate is made by polyurethane or polysiloxanes.
10, keyboard as claimed in claim 1, wherein light guide plate is suitable for making after push-botton operation this button to be returned to initial position.
11, keyboard as claimed in claim 1 further comprises at least one projection on the lower surface that is formed at light guide plate, and this lower surface is relative with the upper surface of light guide plate.
12, keyboard as claimed in claim 11, wherein reflection graphic patterns is formed on the lower surface of light guide plate and is positioned at high spot and around projection.
13, keyboard as claimed in claim 11, wherein reflection graphic patterns is formed on the projection.
14, a kind of keyboard components comprises:
Keyboard, this keyboard have the light guide plate of propagating therein for light, and have film, and this film is located on the upper surface of light guide plate and the upper surface of this film is provided with at least one button; And
Switchboard, this switchboard have at least one and are formed at its switch on the upper surface of keyboard, wherein when button is pressed, the part of keyboard towards the switchboard distortion with driving switch.
15, keyboard components as claimed in claim 14, wherein keyboard has at least one reflection graphic patterns, and this reflection graphic patterns is formed on the light guide plate partly, is used for towards a part of light of button reflection by the light guide plate internal communication.
16, keyboard components as claimed in claim 14 further comprises at least one light-emitting device, and this light-emitting device is towards the side surface setting and the suitable inside that light is coupled in light guide plate of light guide plate.
17, keyboard components as claimed in claim 14, wherein film is made by transparent elastic material.
18, keyboard components as claimed in claim 17, wherein film is made by polyurethane or polysiloxanes.
19, keyboard components as claimed in claim 14, wherein film is connected in the upper surface of light guide plate by adhering part.
20, keyboard components as claimed in claim 19, wherein the periphery of film is connected in the periphery of light guide plate.
21, keyboard components as claimed in claim 20 wherein is provided with air layer between the core of film and light guide plate.
22, keyboard components as claimed in claim 14, wherein light guide plate is made by transparent elastic material.
23, keyboard components as claimed in claim 22, wherein light guide plate is made by polyurethane or polysiloxanes.
24, keyboard components as claimed in claim 14, wherein light guide plate is suitable for making after push-botton operation this button to be returned to initial position.
25, keyboard components as claimed in claim 15 further comprises at least one projection on the lower surface that is formed at light guide plate, and this lower surface is relative with the upper surface of light guide plate.
26, keyboard components as claimed in claim 25, wherein reflection graphic patterns is formed on the lower surface of light guide plate and is positioned at high spot and around projection.
27, keyboard components as claimed in claim 14 further comprises the diffuse reflection parts on the side surface of light-emitting device that are arranged at light guide plate, comes the incident ray of selfluminous device with diffuse reflection.
28, a kind of portable terminal comprises:
Upper surface is provided with the switchboard of at least one switch;
Keyboard with light guide plate, this light guide plate has upper surface, lower surface and side surface; And
At least one light-emitting device, this light-emitting device are oriented at least one side surface near light guide plate, and wherein this keyboard comprises:
Film, this film are positioned on the upper surface of light guide plate and the upper surface of this film is provided with at least one button: and
At least one reflection graphic patterns, this reflection graphic patterns is formed on the light guide plate partly, is used for towards a part of light of button reflection by the light guide plate internal communication.
CNB2005101340976A 2005-05-19 2005-12-27 Keypad and keypad assembly Active CN100470702C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020050042035A KR100606081B1 (en) 2005-05-19 2005-05-19 Light guide panel, keypad and keypad assembly
KR200542035 2005-05-19
KR200564351 2005-07-15

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CN2007101817077A Division CN101150019B (en) 2005-05-19 2005-12-27 Keypad and keypad assembly

Publications (2)

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CN1866438A true CN1866438A (en) 2006-11-22
CN100470702C CN100470702C (en) 2009-03-18

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CNB2005101340976A Active CN100470702C (en) 2005-05-19 2005-12-27 Keypad and keypad assembly

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CN (2) CN100470701C (en)
ZA (2) ZA200708780B (en)

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ZA200708780B (en) 2009-01-28
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CN100470702C (en) 2009-03-18
KR100606081B1 (en) 2006-07-28
CN1866437A (en) 2006-11-22

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