CN108766818A - Back lighting device for illuminated keyboard - Google Patents

Back lighting device for illuminated keyboard Download PDF

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Publication number
CN108766818A
CN108766818A CN201810557748.XA CN201810557748A CN108766818A CN 108766818 A CN108766818 A CN 108766818A CN 201810557748 A CN201810557748 A CN 201810557748A CN 108766818 A CN108766818 A CN 108766818A
Authority
CN
China
Prior art keywords
light
micro
extraction region
light extraction
prism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810557748.XA
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Chinese (zh)
Inventor
古佑铨
何信政
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Darfon Electronics Suzhou Co Ltd
Darfon Electronics Corp
Original Assignee
Darfon Electronics Suzhou Co Ltd
Darfon Electronics Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Darfon Electronics Suzhou Co Ltd, Darfon Electronics Corp filed Critical Darfon Electronics Suzhou Co Ltd
Publication of CN108766818A publication Critical patent/CN108766818A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01H13/83—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 characterised by legends, e.g. Braille, liquid crystal displays, light emitting or optical elements
    • 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
    • H01H13/023—Light-emitting indicators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2219/00—Legends
    • H01H2219/054—Optical elements
    • 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
    • H01H2219/066—Lens

Landscapes

  • Planar Illumination Modules (AREA)
  • Push-Button Switches (AREA)

Abstract

The present invention discloses a kind of back lighting device for illuminated keyboard.The back lighting device of the present invention includes light guide plate and light source.The front of light guide plate defines a plurality of rectangular light extraction regions thereon.Each light extraction region corresponds to a keycap and position is under its corresponding keycap.Light guide plate is in each light extraction region and with a plurality of micro-prism structures being mutually parallel.On one side arrangement of a plurality of micro-prism structures in four sides in this light extraction region in each light extraction region.Light source is injected to emit light in light guide plate.The a part of light of a plurality of micro-prism structures in each light extraction region of light directive is adjusted by a plurality of micro-prism structures, and then directive corresponds to the keycap in this light extraction region.The present invention can reduce the light leakage around the keycap of illuminated keyboard.

Description

Back lighting device for illuminated keyboard
Technical field
The back lighting device (backlight apparatus) that the present invention relates to a kind of for illuminated keyboard, and especially About the back lighting device for illuminated keyboard and energy reducing key hat brim edge light leakage (especially lower edge light leakage).
Background technology
Illuminated keyboard has been common on the market input peripheral device.Illuminated keyboard is comprising back lighting device and is set to the back of the body A plurality of keycaps on electro-optical device.Back lighting device includes light guide plate and light source.Light source to emit light, lead by light injection It in tabula rasa, and is directed to from the front of light guide plate and projects, and then the keycap that directive is disposed above.
However, the existing back lighting device for illuminated keyboard, the light extraction region of keycap is corresponded to simultaneously on the front of light guide plate Design without adjustment light, lead to the light projected from the light extraction region of light guide plate, has some light above be set to The edge of keycap is leaked out and (is especially leaked out from lower edge), or even understands the eyes of directive user, and the eyes of user is allowed not relax Clothes.
Invention content
Therefore, the present invention it is to be solved the technical issues of be to provide a kind of back lighting device for illuminated keyboard, according to The back lighting device of the present invention can reduce the light leakage around the keycap of illuminated keyboard, more preferably, can be further reduced around keycap Halation.
In order to achieve the above object, the present invention proposes that a kind of back lighting device for illuminated keyboard, the illuminated keyboard include A plurality of keycaps, a plurality of keycaps are set on the back lighting device, which includes：Light guide plate and light source.It leads Tabula rasa has front, the back side, downside and the upper side opposite with the downside, and definition is parallel to the transverse direction of the downside Direction and longitudinal direction perpendicular to the horizontal direction, in defining a plurality of rectangular light extraction regions on the front, often One light extraction region corresponds to a keycap and each light extraction region is located under its corresponding keycap, each light extraction region tool Have close to the downside first while, close to the second of the upper side while, it is adjacent this first while with this second while third side with And it is adjacent this first while with this second while and with the third while the opposite the 4th while, which has in each light extraction region There are a plurality of the first micro-prism structures being mutually parallel, a plurality of first micro-prism structures in each light extraction region abut Each light extraction region itself this first while, this second while, the third while and when the 4th in arrangement on one side；Light source is used To emit light, which injects in the light guide plate, which is guided by the light guide plate from front injection, and towards the plural number A keycap advances, the first part light warp of a plurality of first micro-prism structures in the light in each light extraction region of directive It is adjusted by a plurality of first micro-prism structures, and then respectively corresponding keycap in each light extraction region of directive.
As optional technical solution, which includes also a plurality of smooth steering structures, is formed on the back side, this is multiple Several smooth steering structures are oriented to the front to the light of a plurality of smooth steering structures by directive.
As optional technical solution, which further includes reflective layer, and setting is formed under the back side, should Reflective layer is reflecting the light of the directive reflective layer.
As optional technical solution, the section of each the first micro-prism structure in inverted V-shape, dash forward by prominent, inverted u-shaped Go out, one of in the group that V-shape groove and U-shaped groove are formed.
As optional technical solution, a plurality of first micro-prism structures in each light extraction region are along the transverse direction side To extending and being arranged against first side in each light extraction region itself, the light guide plate in also including in each light extraction region It is a plurality of extend along the horizontal direction and against the second micro-prism structures of second side arrangement, a plurality of prolong along the longitudinal direction Stretch and against the third while arrangement third micro-prism structure and it is a plurality of along the longitudinal direction extend and against the 4th while 4th micro-prism structure of arrangement, the of a plurality of second micro-prism structures in the light in each light extraction region of directive Two portions of light are adjusted via a plurality of second micro-prism structures, and then respectively corresponding key in each light extraction region of directive Cap, the third portions of light of a plurality of third micro-prism structures in the light in each light extraction region of directive is via the plural number A third micro-prism structure adjusts, and then respectively corresponding keycap in each light extraction region of directive, and directive is each in the light 4th portions of light of a plurality of 4th micro-prism structures in a light extraction region is via a plurality of 4th micro-prism structure tune It is whole, and then respectively corresponding keycap in each light extraction region of directive.
As optional technical solution, which further includes light shield layer, is set on the front and the screening There are photosphere a plurality of holes, each holes to correspond to a light extraction region, and the light shield layer is blocking the light from addition to this It projects in other overseas regions of a plurality of output optical zones.
In addition, the present invention also proposes that another back lighting device for being used for illuminated keyboard, the illuminated keyboard include a plurality of keys Cap, a plurality of keycaps are set on the back lighting device, which includes：Light guide plate, prism thin plate and light source.It leads Tabula rasa has front and the back side；Prism thin plate is set to the upper front of the light guide plate, which has upper table Face, lower surface, downside and the upper side opposite with the downside, and definition be parallel to the downside horizontal direction and It is a plurality of at square in being defined on upper surface or the lower surface of the prism thin plate perpendicular to the longitudinal direction of the horizontal direction The light extraction region of shape, each light extraction region corresponds to a keycap and each light extraction region is located under its corresponding keycap, Each light extraction region have close to the downside first while, close to the second of the upper side while, adjacent first side with should Second while third while and it is adjacent this first while with this second while and with the third while the opposite the 4th while, the prism thin plate in Have a plurality of the first micro-prism structures being mutually parallel, this in each light extraction region a plurality of in each light extraction region First micro-prism structure against each light extraction region itself this first while, this second while, the third while and when the 4th In arrangement on one side；To emit light, which injects in the light guide plate light source, which is guided from this just by the light guide plate Face is projected, and is advanced across the prism thin plate and towards a plurality of keycaps, in the light in each light extraction region of directive The first part light of a plurality of first micro-prism structures is adjusted via a plurality of first micro-prism structures, and then respective directive The corresponding keycap in each light extraction region.
As optional technical solution, the section of each the first micro-prism structure in inverted V-shape, dash forward by prominent, inverted u-shaped Go out, one of in the group that V-shape groove and U-shaped groove are formed.
As optional technical solution, a plurality of first micro-prism structures in adjacent light extraction region link together.
As optional technical solution, a plurality of first micro-prism structures in all light extraction regions are distributed whole as a whole A upper surface or entire lower surface, the prism thin plate in each light extraction region have hollow-out parts, each light extraction region This first while, this second while, the third while the 4th while and hollow-out parts in it between exist and retain part, in each In one's duty a plurality of first micro-prism structures in reserve part in light extraction region still retain.
As optional technical solution, a plurality of first micro-prism structures in each light extraction region are along the transverse direction side To extending and arranged against first side, which a plurality of prolongs along the horizontal direction in also having in each light extraction region Stretch and against this second while arrangement the second micro-prism structure, it is a plurality of along the longitudinal direction extend and against the third while arrange Third micro-prism structure and it is a plurality of along the longitudinal direction extend and against the 4th side arrangement the 4th micro-prism structure, Second portions of light of a plurality of second micro-prism structures in the light in each light extraction region of directive is a plurality of via this Second micro-prism structure adjusts, and then respectively each light extraction region of directive corresponding keycap, in the light directive each The third portions of light of a plurality of third micro-prism structures in light extraction region is adjusted via a plurality of third micro-prism structures, And then respective each light extraction region of directive corresponding keycap, this in the light in each light extraction region of directive are a plurality of 4th portions of light of the 4th micro-prism structure is adjusted via a plurality of 4th micro-prism structures, so respectively directive each go out The corresponding keycap in light region.
As optional technical solution, which includes also a plurality of smooth steering structures, is formed on the back side, this is multiple Several smooth steering structures are oriented to the front to the light of a plurality of smooth steering structures by directive.
As optional technical solution, which further includes the first reflective layer and light shield layer.First is reflective Layer is formed in the upper surface in addition on other overseas regions of corresponding a plurality of output optical zones, which penetrates to reflect To the light of first reflective layer；Light shield layer is formed on first reflective layer, which passes through to block the light The some light of first reflective layer projects.
As optional technical solution, which further includes the second reflective layer, is set under the back side, should Second reflective layer is reflecting the light of directive second reflective layer.
As optional technical solution, which includes also a plurality of smooth steering structures, is formed on the back side, this is multiple Several smooth steering structures are oriented to the front to the light of a plurality of smooth steering structures by directive；Alternatively, the light guide plate is also Including a plurality of smooth steering structures, are formed on the front, a plurality of smooth steering structures are scattering directive a plurality of light The light of steering structure.
Different from prior art, back lighting device according to the present invention is for that in illuminated keyboard, can reduce the key of illuminated keyboard The light leakage of cap lower edge avoids causing the eyes of user uncomfortable.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Description of the drawings
Fig. 1 is the component expansion signal of the illuminated keyboard of the back lighting device of the first preferred embodiment using the present invention Figure.
Fig. 2 is illuminated keyboard in Fig. 1 along the cross section view of line A-A.
Fig. 3 is the partial top view according to its light guide plate of the back lighting device of the first preferred embodiment of the present invention.
Fig. 4, Fig. 5, Fig. 6 and Fig. 7 be respectively in Fig. 3 light guide plate along the partial cross sectional views of line B-B.
Fig. 8 is the fragmentary top according to the light guide plate of a deformation of the back lighting device of the first preferred embodiment of the present invention View.
Fig. 9 is light guide plate in Fig. 8 along the partial cross sectional views of line C-C.
Figure 10 is that the component expansion of the illuminated keyboard of the back lighting device of the second preferred embodiment using the present invention is shown It is intended to.
Figure 11 is illuminated keyboard in Figure 10 along the cross section view of line D-D.
Figure 12 is the office according to the prism thin plate of a deformation of the back lighting device of the second preferred embodiment of the present invention Portion's vertical view.
Figure 13 is prism thin plate in Figure 12 along the partial cross sectional views of E-E lines.
Figure 14 is the group of the illuminated keyboard of a deformation of the back lighting device of the second preferred embodiment using the present invention Part expanded schematic diagram.
Figure 15 is prism thin plate in Figure 14 along the partial cross sectional views of F-F lines.
Figure 16 is a deformation of the back lighting device of the second preferred embodiment of the present invention and the back of the body using the present invention The partial cross sectional views of the illuminated keyboard of the deformation of electro-optical device.
Figure 17 is that the component expansion of the illuminated keyboard of the back lighting device of third preferred embodiment using the present invention is shown It is intended to.
Figure 18 is illuminated keyboard in Figure 17 along the cross section view of G-G lines.
Figure 19 is the office according to the prism thin plate of a deformation of the back lighting device of the third preferred embodiment of the present invention Portion's vertical view.
Figure 20 is prism thin plate in Figure 19 along the partial cross sectional views of H-H lines.
Figure 21 is the group of the illuminated keyboard of a deformation of the back lighting device of third preferred embodiment using the present invention Part expanded schematic diagram.
Figure 22 is prism thin plate in Figure 21 along the partial cross sectional views of I-I lines.
Figure 23 is a deformation of the back lighting device of the third preferred embodiment of the present invention and the back of the body using the present invention The partial cross sectional views of the illuminated keyboard of the deformation of electro-optical device.
Specific implementation mode
It please refers to Fig.1 to Fig. 9.Fig. 1 is the first preferred embodiment that the present invention is schematically painted with component expanded view Back lighting device 2 and back lighting device using the present invention 2 illuminated keyboard 1.Fig. 2 is illuminated keyboard 1 in Fig. 1 along line A-A Partial cross sectional views.Fig. 3 is the partial top view of light guide plate 20, to show the output optical zone close to the downside 203 of light guide plate 20 Domain 24.Fig. 4, Fig. 5, Fig. 6 and Fig. 7 be respectively in Fig. 3 light guide plate 20 along the partial cross sectional views of line B-B.Fig. 8 is according to this hair The partial top view of the light guide plate 20 of one deformation of the back lighting device 2 of the first bright preferred embodiment, to show close lead The light extraction region 24 of the downside 203 of tabula rasa 20.Fig. 9 is light guide plate 20 in Fig. 8 along the partial cross sectional views of line C-C.
As shown in Figure 1, the illuminated keyboard 1 of back lighting device 2 using the present invention include bottom plate 12, the present invention first preferably The back lighting device 2 and keypad portion 10 of specific embodiment.Bottom plate 12 is set on back lighting device 2, and keypad portion 10 is set to bottom plate On 12, but it is not limited thereto.In a deformation, back lighting device 2 can be set on bottom plate 12, and keypad portion 10 can be set to On back lighting device 2.
Keypad portion 10 includes a plurality of buttons 102.The light projected from the front 201 of the light guide plate 20 of back lighting device 2, wears Cross a plurality of buttons of 12 directive of bottom plate 102.In the present embodiment, bottom plate 12 is light transmission.As shown in Figure 1, bottom plate 12 has plural number A through-hole 122 increases luminous flux with profit.
As shown in Figures 1 and 2, illuminated keyboard 1 includes a plurality of keycaps 104.A plurality of keycaps 104 are set to according to this hair On the back lighting device 2 of the first bright preferred embodiment.The backlight of first preferred embodiment according to the present invention fills It includes light guide plate 20 and light source 22 to set 2.
In a specific embodiment, light guide plate 20 can be by acryl, silica resin (silicone), thermoplastic poly amido Made by formic acid esters (thermoplastic polyurethane, TPU) or other commercial guide-lighting high molecular materials.Light guide plate 20 Layer thickness can according to need depending on, be not particularly limited.For example, when applied to thin-type light emitting button/illuminated keyboard, light guide plate 20 Thickness range is about 0.125mm~0.25mm, and what is more, the thickness of light guide plate 20 can be less than 0.125mm.
Same as shown in Figures 1 and 2, light guide plate 20 has front 201, the back side 202, downside 203 and and downside 203 opposite upper sides 204, and define the horizontal direction T for being parallel to downside 203 and indulging perpendicular to horizontal direction T To direction L.In defining a plurality of rectangular light extraction regions 24 on the front 201 of light guide plate 20.Each light extraction region 24 A corresponding keycap 104, and each light extraction region 24 is located under its corresponding keycap 104.Because light extraction region 24 is non- Entity structure, so being indicated with dotted line in Fig. 1.
As shown in Figures 1 and 3, each light extraction region 24 has the first side close to the downside 203 of light guide plate 20 242, close to the upper side 204 of light guide plate 20 second while 244, it is adjacent first while 242 and when the second third while 244 246 with And adjacent first while 242 with second while 244 and with third while the 246 the opposite the 4th while 248.Light guide plate 20 is in each output optical zone There are a plurality of the first micro-prism structures 252 being mutually parallel in domain 24.A plurality of first in each light extraction region 24 are micro- Prism structure 252 against each itself first of light extraction region 24 at 242, second, 244, third is in 246 and the 4th while Arrangement on one side in 248.In Fig. 1 and example shown in Fig. 3, a plurality of first microprism knots in each light extraction region 24 Structure 252 is arranged against its first side 242.
As shown in Figure 1, light source 22, to emit light, light is injected in light guide plate 20.Light guided by light guide plate 20 and It projects from the front 201 of light guide plate 20, and advances towards a plurality of keycaps 104.In a specific embodiment, light source 22 can wrap Containing a plurality of light-emitting diode components or Organic Light Emitting Diode component, but the present invention is not limited thereto.
In a specific embodiment, the beside 206 of example as shown in Figure 1, light source 22 close to light guide plate 20 is arranged, light The light that source 22 emits injects light guide plate 20 from beside 206.
In another specific embodiment, light guide plate 20 also has a plurality of perforative openings (not being illustrated in figure).Especially Ground, a plurality of perforative openings are generally arranged along the center line of downside 203.Each opening has from a incidence surface.Light Source 22 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, each luminescence component can It is placed in its corresponding opening.The light that each luminescence component is emitted injects light guide plate from the incidence surface of its corresponding opening 20。
In another specific embodiment, light guide plate 20 also has plurality of openings (not being illustrated in figure).Particularly, this is multiple Several openings are formed on the back side 202 of light guide plate 20 and close to the downside 203 of light guide plate 20.Each opening has certainly A incidence surface.Light source 22 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, often One luminescence component can be placed in its corresponding opening.The light that each luminescence component is emitted enters from its corresponding opening Smooth surface injects light guide plate 20.
As shown in Fig. 2, the illuminated keyboard 1 of back lighting device 2 using the present invention also include keycap 104, reply element 105, Elevating mechanism 106 and thin film switch 108.One end of elevating mechanism 106 is movably connected keycap 104, and the other end is movable Ground connecting bottom board 12.Keycap 104 is installed on elevating mechanism 106.Elevating mechanism 106 supports keycap 104 to make relative to switch 108 Vertically move.Elevating mechanism 106 shown in Fig. 2 is scissors lift mechanism, and it is elastic dome body to reply element 105.In another In one preferred embodiment, elevating mechanism 106 is butterfly type lifting mechanism, and it is shrapnel to reply element 105.In another preferable tool In body embodiment, it is magnet assembly to reply element 105, and the framework of button 102 of the invention can also belong to magnetic attractive button.
Switch 108 is made of upper thin film circuit 1082 and lower thin film circuit 1084, and will be upper thin by insulating element 1086 Film circuit 1082 is separated with lower thin film circuit 1084.Element 105 is replied to be set on thin film circuit 1082.As shown in Fig. 2, returning It can be elastic dome body (resilient dome) to recover part 105, and but not limited to this.External force, which is applied on keycap 104, to be made Keycap 104 is moved towards upper thin film circuit 1082.The moving and be deformed with keycap 104 of element 105 is replied, in actuating Thin film circuit 1082 is deformed and is moved towards lower thin film circuit 1084, and then opens switch 108.
As shown in Fig. 2, first of a plurality of first micro-prism structures 252 in light in each light extraction region 24 of directive Portions of light is adjusted via a plurality of first micro-prism structures 252, and then directive corresponds to the keycap 104 in this light extraction region 24 (i.e. Respectively each 24 corresponding keycap 104 of light extraction region of directive).It is represented originally not by the first micro-prism structure with dotted line in Fig. 2 The travelling route of the light of 252 adjustment, the eyes of the light most probably directive user to advance along this route allow the eye of user Eyeball is uncomfortable.Upper thin film circuit 1082, lower thin film circuit 1084 and reply element 105 can be by transparent or translucent material structures At allowing light can be directly by reach keycap 104.
In a specific embodiment, light guide plate 20 also includes a plurality of smooth steering structures 205.A plurality of smooth steering structures 205 are formed on the back side 202 of light guide plate 20, the light of a plurality of smooth steering structures of directive 205 is oriented to light guide plate 20 Front 201.A plurality of smooth steering structures 205 can also be only formed partially on the back side 202 of light guide plate 20, to light into Row is oriented to advance towards the transmission region 1042 of corresponding keycap 104, as shown in Figure 2.The transmission region 1042 of keycap 104 corresponds to One pattern, the pattern one of represent in character, number, symbol, function key.A plurality of smooth steering structures 205 can be by Dotted light color (for example, white) ink is printed on the back side of light guide plate 20 202 to be formed, and micro-structure (micro- can also be used Lens), plated film mode can also be used to be integrally formed with light guide plate 20.But the generation type of a plurality of smooth steering structures 205 not with Above-mentioned processing procedure is limited.
Further, as shown in Fig. 2, the back lighting device 2 of the first preferred embodiment according to the present invention also includes anti- Photosphere 26.Reflective layer 26 is set on the back side 202 of light guide plate 20, to reflect the light of directive reflective layer 26.Reflective layer 26 can be formed by white polyester film, but are not limited thereto.
In a specific embodiment, the section of each the first micro-prism structure 252 can be in that inverted V-shape protrudes (such as Fig. 4 It is shown), inverted u-shaped protrude (as shown in Figure 5), V-shape groove (as shown in Figure 6), U-shaped groove (as shown in Figure 7) or other The protrusion or groove of shape.
Further, as shown in Fig. 2, the back lighting device 2 of the first preferred embodiment according to the present invention also includes shading Layer 28.Light shield layer 28 is set on the front 201 of light guide plate 20.Light shield layer 28 has a plurality of holes (or transparent area) 282. Each holes corresponds to a light extraction region 24.Light shield layer 28 is shutting out the light from other than a plurality of light extraction regions of correspondence 24 Other regions project.
In a specific embodiment, as can be seen from figures 8 and 9, a plurality of first microprisms in each light extraction region 24 T extends structure 252 in transverse direction, and is arranged against first side 242 in each light extraction region 24 itself.Light guide plate 20 in In each light extraction region 24 also with a plurality of T in transverse direction extend the second micro-prism structure 254, it is a plurality of along longitudinal direction The 4th micro-prism structure 258 that the third micro-prism structure 256 and a plurality of L along the longitudinal direction that direction L extends extend.It is each A plurality of second micro-prism structures 254 in a light extraction region 24 are arranged against its second side 244.In each light extraction region 24 A plurality of third micro-prism structures 256 against its third side 246 arrange.A plurality of four in each light extraction region 24 are micro- Prism structure 258 is arranged against its 4th side 248.A plurality of second microprisms in light in each light extraction region 24 of directive Second portions of light of structure 254 is adjusted via a plurality of second micro-prism structures 254, and then respectively each light extraction region of directive 24 corresponding keycaps 104.The third portion of a plurality of third micro-prism structures 256 in light in each light extraction region 24 of directive Part light is adjusted via a plurality of third micro-prism structures 256, and then respectively each 24 corresponding keycap of light extraction region of directive 104.4th portions of light of a plurality of 4th micro-prism structures 258 in light in each light extraction region 24 of directive is via plural number A 4th micro-prism structure 258 adjustment, and then respectively each 24 corresponding keycap 104 of light extraction region of directive.Thereby, according to this The back lighting device 2 of first preferred embodiment of invention can reduce the light leakage of the lower edge of the keycap 104 of illuminated keyboard 1.The One micro-prism structure 252, the second micro-prism structure 254, third micro-prism structure 256 and the 4th micro-prism structure 258 are profits The transmission path of light is adjusted with the principle of refraction.
Similarly, the section of the second micro-prism structure 254, third micro-prism structure 256 and the 4th micro-prism structure 258 Can be in inverted V-shape protrusion, inverted u-shaped protrusion, the protrusion or groove of V-shape groove, U-shaped groove or other shapes.
0 is please referred to Fig.1 to Figure 13.Figure 10 is schematically painted the second preferred embodiment of the present invention with component expanded view Back lighting device 3 and back lighting device using the present invention 3 illuminated keyboard 1.Figure 11 is illuminated keyboard 1 in Figure 10 along line D-D Partial cross sectional views.Figure 12 is the prism according to a deformation of the back lighting device 3 of the second preferred embodiment of the present invention The partial top view of thin plate 31, to show the light extraction region 34 close to the downside 313 of prism thin plate 31.Figure 13 is in Figure 12 Partial cross sectional views of the prism thin plate 31 along E-E lines.
As shown in Figure 10, the illuminated keyboard 1 of back lighting device 3 using the present invention includes bottom plate 12, according to the present invention the The back lighting device 3 and keypad portion 10 of two preferred embodiments.Bottom plate 12 is set on back lighting device 3, and keypad portion 10 is arranged In on bottom plate 12, but it is not limited thereto.In a deformation, back lighting device 3 can be set on bottom plate 12, and keypad portion 10 can be with It is set on back lighting device 3.
Keypad portion 10 includes a plurality of buttons 102.The light projected from the front 301 of the light guide plate 30 of back lighting device 3, wears Cross a plurality of buttons of directive after prism thin plate 31, bottom plate 12 102.The component with number mark identical with Fig. 1, has in Figure 10 Same or similar structure and function, do not repeat herein.
As shown in Figures 10 and 11, illuminated keyboard 1 includes a plurality of keycaps 104.A plurality of keycaps 104 are set to according to this On the back lighting device 3 of second preferred embodiment of invention.The backlight of second preferred embodiment according to the present invention Device 3 includes light guide plate 30, prism thin plate 31 and light source 32.
Same as shown in Figures 10 and 11, light guide plate 30 has front 301 and the back side 302.Prism thin plate 31 is set to The top in the front 301 of light guide plate 30.Prism thin plate 31 have upper surface 311, lower surface 312, downside 313 and with downside The opposite upper side 314 in face 313, and define and be parallel to the horizontal direction T of downside 313 and perpendicular to horizontal direction T's Longitudinal direction L.In defining a plurality of rectangular light extraction regions 34 on the upper surface of prism thin plate 31 311.Each light extraction Region 34 corresponds to a keycap 104, and each light extraction region 34 is located under its corresponding keycap 104.Because a plurality of 34 non-physical structure of light extraction region, so being indicated with dotted line in Figure 10.
As shown in Figure 10, each light extraction region 34 have the first side 342 close to the downside 313 of prism thin plate 31, Close to prism thin plate 31 upper side 314 second while 344, it is adjacent first while 342 and when the second third while 344 346 and Adjacent first while 342 with second while 344 and with third while the 346 the opposite the 4th while 348.Prism thin plate 31 is in each output optical zone There are a plurality of the first micro-prism structures 332 being mutually parallel in domain 34.A plurality of first in each light extraction region 34 are micro- Prism structure 332 against each itself first of light extraction region 34 at 342, second, 344, third is in 346 and the 4th while Arrangement on one side in 348.In the example shown in Figure 10 and Figure 11, a plurality of first microprisms in each light extraction region 34 Structure 332 is arranged against its first side 342.
As shown in Figure 10, light source 32 to emit light, inject in light guide plate 30 by light.In a specific embodiment, light Source 32 can include a plurality of light-emitting diode components or Organic Light Emitting Diode component, but the present invention is not limited thereto.
In a specific embodiment, the beside 306 of example as shown in Figure 10, light source 32 close to light guide plate 30 is arranged, The light that light source 32 emits injects light guide plate 30 from beside 306.
In another specific embodiment, light guide plate 30 also has a plurality of perforative openings (not being illustrated in figure).Especially Ground, a plurality of perforative openings are generally arranged along the center line of downside 303.Each opening has from a incidence surface.Light Source 32 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, each luminescence component can It is placed in its corresponding opening.The light that each luminescence component is emitted injects light guide plate from the incidence surface of its corresponding opening 30。
In another specific embodiment, light guide plate 30 also has plurality of openings (not being illustrated in figure).Particularly, this is multiple Several openings are formed on the back side 302 of light guide plate 30 and close to the downside 303 of light guide plate 30.Each opening has certainly A incidence surface.Light source 32 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, often One luminescence component can be placed in its corresponding opening.The light that each luminescence component is emitted enters from its corresponding opening Smooth surface injects light guide plate 30.
In a specific embodiment, the section of each the first micro-prism structure 332 can be in inverted V-shape protrusion, U-shaped Type protrusion, the protrusion or groove of V-shape groove, U-shaped groove or other shapes.
As shown in figure 11, light is guided and projected from the front 301 of light guide plate 30 by light guide plate 30, and it is thin to then pass through prism Plate 31 and towards a plurality of keycaps 104 advance.A plurality of first microprism knots in light in each light extraction region 34 of directive The first part light of structure 332 is adjusted via a plurality of first micro-prism structures 332, and then directive corresponds to this light extraction region 34 Keycap 104 (keycap 104 in i.e. respective each light extraction region 34 of directive).It is represented originally not by first micro- rib with dotted line in Figure 11 The travelling route for the light that mirror structure 332 adjusts, the eyes of the light most probably directive user to advance along this route, allows use The eyes of person are uncomfortable.First micro-prism structure 332 is the transmission path that light is adjusted using the principle of refraction.
As shown in Figure 10, a plurality of first micro-prism structures 332 in adjacent light extraction region 34 link together.Namely It says, a plurality of first micro-prism structures 332 in all light extraction regions 34 are distributed in the upper surface of prism thin plate 31 as a whole On 311 most of area.
As shown in figure 11, light guide plate 30 also includes a plurality of smooth steering structures 305.A plurality of formation of smooth steering structure 305 In on the back side of light guide plate 30 302, the light of a plurality of smooth steering structures of directive 305 to be oriented to the front of light guide plate 30 301.A plurality of smooth steering structures 305 can also be formed partially on the back side 302 of light guide plate 30, to light be oriented to Transmission region 1042 towards corresponding keycap 104 advances, as shown in figure 11.A plurality of smooth steering structures 305 can be by leaded light Dotted light color (for example, white) ink is printed on the back side 302 of plate 30 to be formed, and can also be used micro-structure, can also be used plated film Mode is integrally formed with light guide plate 30.But the generation type of a plurality of smooth steering structures 305 is not limited with above-mentioned processing procedure.
Further, as shown in figure 11, the back lighting device 3 of the second preferred embodiment according to the present invention also includes the One reflective layer 35 and light shield layer 36.First reflective layer 35 is formed in the upper surface 311 of prism thin plate 31 in addition to correspondence is a plurality of On other regions outside light extraction region 34.First reflective layer 35 is reflecting the light of the first reflective layer of directive 35.Light shield layer 36 It is formed on the first reflective layer 35, to block some light injection across the first reflective layer 35.
In a specific embodiment, the first reflective layer 35 can be formed by light color inks layer, for example, white ink layer. Light shield layer 36 can be formed by dark oil layer of ink, for example, black ink layer.
Further, as shown in figure 11, the back lighting device 3 of the second preferred embodiment according to the present invention also includes the Two reflective layers 38.Second reflective layer 38 is set under the back side of light guide plate 30.Second reflective layer 38 is reflecting directive second The light of reflective layer 38.Second reflective layer 38 can be formed by white polyester film, but be not limited thereto.
In a specific embodiment, as shown in FIG. 12 and 13, a plurality of first micro- ribs in each light extraction region 34 T extends mirror structure 332 in transverse direction, and against its first while 332 (i.e. each light extraction region 34 itself first while 332) it arranges.Prism thin plate 31 is in the second micro- rib also extended with a plurality of T in transverse direction in each light extraction region 34 What the third micro-prism structure 336 and a plurality of L along the longitudinal direction that mirror structure 334, a plurality of L along the longitudinal direction extend extended 4th micro-prism structure 338.A plurality of second micro-prism structures 334 in each light extraction region 34 abut its second side 344 Arrangement.A plurality of third micro-prism structures 336 in each light extraction region 34 are arranged against its third side 346.Each goes out A plurality of 4th micro-prism structures 338 in light region 34 are arranged against its 4th side 348.Each output optical zone of directive in light Second portions of light of a plurality of second micro-prism structures 334 in domain 34 is adjusted via a plurality of second micro-prism structures 334, into And directive corresponds to the keycap 104 (each 34 corresponding keycap 104 of light extraction region of i.e. respective directive) in this light extraction region 34.Light The third portions of light of a plurality of third micro-prism structures 336 in line in each light extraction region 34 of directive is via a plurality of thirds Micro-prism structure 336 adjusts, and then directive corresponds to (i.e. respective each output optical zone of directive of keycap 104 in this light extraction region 34 34 corresponding keycap 104 of domain).Of a plurality of 4th micro-prism structures 338 in light in each light extraction region 34 of directive Four portions of light are adjusted via a plurality of 4th micro-prism structures 338, and then directive corresponds to the keycap 104 in this light extraction region 34 (each 34 corresponding keycap 104 of light extraction region of i.e. respective directive).Thereby, the second preferred embodiment according to the present invention Back lighting device 3 can reduce illuminated keyboard 1 keycap 104 lower edge light leakage.First micro-prism structure 332, second micro- rib Mirror structure 334, third micro-prism structure 336 and the 4th micro-prism structure 338 are to adjust light using the principle of refraction Transmission path.
Similarly, the section of the second micro-prism structure 334, third micro-prism structure 336 and the 4th micro-prism structure 338 Can be in inverted V-shape protrusion, inverted u-shaped protrusion, the protrusion or groove of V-shape groove, U-shaped groove or other shapes.
Please refer to Fig.1 4 and Figure 15.Figure 14 is schematically painted the second preferred embodiment of the present invention with component expanded view Back lighting device 3 one deformation and using the back lighting device 3 illuminated keyboard 1.Figure 15 is illuminated keyboard 1 in Figure 14 along F-F The partial cross sectional views of line.
As shown in figure 14, a plurality of first micro-prism structures 332 in adjacent light extraction region 34 link together, to institute There are a plurality of first micro-prism structures 332 in light extraction region 34 to be distributed in the upper surface of entire prism thin plate 31 as a whole 311.A plurality of first micro-prism structures 332 can be arranged in parallel with T in transverse direction or longitudinal direction L.The model shown in Figure 14 In example, T is arranged in parallel in transverse direction for a plurality of first micro-prism structures 332.There is number mark identical with Figure 10 in Figure 14 The component of note has same or similar structure and function, does not repeat herein.
In conjunction with shown in Figure 13 and Figure 14, prism thin plate 31 is interior with hollow-out parts 318 in each light extraction region 34.Each Hollow-out parts 318 in light extraction region 34 and 34 itself first of this light extraction region at 342, second 344, third side 346 with 4th while between 348 exist retain part 349 (i.e. each light extraction region 34 first while 342, second in 344, third while 346 and the 4th exist between side 348 and hollow-out parts 318 in it and retain part 349).Reservation in each light extraction region 34 Partly a plurality of first micro-prism structures 332 in 349 still retain.
As shown in figure 15, light is guided from front 301 by light guide plate 30 and is projected, and then passes through prism thin plate 31 and towards again Several keycaps 104 advance.The a plurality of first microprism knots retained in part 349 in each light extraction region 34 of directive in light The portions of light of structure 332 is adjusted via a plurality of first micro-prism structures 332 at this, and then directive corresponds to this light extraction region 34 Keycap 104 (each 34 corresponding keycap 104 of light extraction region of i.e. respective directive).It is represented originally not by multiple with dotted line in Figure 15 The travelling route for the light that several first micro-prism structures 332 adjust, the light most probably directive user to advance along this route Eyes, make the eyes of user uncomfortable.Above-mentioned a plurality of first micro-prism structures 332 are adjusted using the principle of refraction The transmission path of light.Hollow-out parts 318 in each light extraction region 34 and the first side of itself of this light extraction region 34 342, second in 344, third 346 and the 4th existing between side 348 to retain a plurality of first still retained in part 349 micro- Prism structure 332 can reduce the light leakage around keycap 104, and the halation being further reduced around keycap 104.Have in Figure 15 The component of number mark identical with Figure 11, has same or similar structure and function, does not repeat herein.
Please refer to Fig.1 6.Figure 16 is a deformation of the back lighting device 3 of the second preferred embodiment of the present invention and adopts With the partial cross sectional views of the illuminated keyboard 1 of the deformation of the back lighting device 3 of the present invention.The definition of its hatching of section shown in Figure 16 With the line D-D in Figure 10.
As shown in figure 16, light guide plate 30 also includes a plurality of smooth steering structures 305.A plurality of formation of smooth steering structure 305 In on the front 301 of light guide plate 30, to scatter the light of a plurality of smooth steering structures of directive 305.A plurality of smooth steering structures 305 can also only be formed partially on the front 301 of light guide plate 30, as shown in figure 16.A plurality of smooth steering structures 305 can be by Dotted light color (for example, white) ink is printed on the back side of light guide plate 30 302 to be formed, and micro-structure can also be used, it can also It is integrally formed with plated film mode and light guide plate 30.The generation type of a plurality of smooth steering structures 305 is not limited with above-mentioned processing procedure.Shape The overall light for being pointed into keycap 104 is allowed to become more soft in a plurality of smooth steering structures 305 on the front 301 of light guide plate 30 With, but brightness and undamped.In Figure 16 with number mark identical with Figure 11 component, have same or similar structure and Function does not repeat herein.
7 are please referred to Fig.1 to Figure 20.Figure 17 is schematically painted the third preferred embodiment of the present invention with component expanded view Back lighting device 4 and back lighting device using the present invention 4 illuminated keyboard 1.Figure 18 is illuminated keyboard 1 in Figure 17 along G-G lines Partial cross sectional views.Figure 19 is the prism according to a deformation of the back lighting device 4 of the third preferred embodiment of the present invention The partial top view of thin plate 41, to show the light extraction region 44 close to the downside 413 of prism thin plate 41.Figure 20 is in Figure 19 Partial cross sectional views of the prism thin plate 41 along H-H lines.
As shown in figure 17, the illuminated keyboard 1 of back lighting device 4 using the present invention includes bottom plate 12, according to the present invention the The back lighting device 4 and keypad portion 10 of three preferred embodiments.Bottom plate 12 is set on back lighting device 4, and keypad portion 10 is arranged In on bottom plate 12, but it is not limited thereto.In a deformation, back lighting device 4 can be set on bottom plate 12, and keypad portion 10 can be with It is set on back lighting device 4.
Keypad portion 10 includes a plurality of buttons 102.The light projected from the front 401 of the light guide plate 40 of back lighting device 4, wears Cross a plurality of buttons of directive after prism thin plate 41, bottom plate 12 102.The component with number mark identical with Fig. 1, has in Figure 17 Same or similar structure and function, do not repeat herein.
As shown in FIG. 17 and 18, illuminated keyboard 1 includes a plurality of keycaps 104.A plurality of keycaps 104 are set to according to this On the back lighting device 4 of the third preferred embodiment of invention.The backlight of third preferred embodiment according to the present invention Device 4 includes light guide plate 40, prism thin plate 41 and light source 42.
Same as shown in FIG. 17 and 18, light guide plate 40 has front 401 and the back side 402.Prism thin plate 41 is set to The top in the front 401 of light guide plate 40.Prism thin plate 41 have upper surface 411, lower surface 412, downside 413 and with downside The opposite upper side 414 in face 413, and define and be parallel to the horizontal direction T of downside 413 and perpendicular to horizontal direction T's Longitudinal direction L.In defining a plurality of rectangular light extraction regions 44 on the lower surface of prism thin plate 41 412.Each light extraction Region 44 corresponds to a keycap 104, and each light extraction region 44 is located under its corresponding keycap 104.Because a plurality of 44 non-physical structure of light extraction region, so being indicated with dotted line in Figure 17.
As shown in figure 17, each light extraction region 44 have the first side 442 close to the downside 413 of prism thin plate 41, Close to prism thin plate 41 upper side 414 second while 444, it is adjacent first while 442 and when the second third while 444 446 and Adjacent first while 442 with second while 444 and with third while the 446 the opposite the 4th while 448.Prism thin plate 41 is in each output optical zone There are a plurality of the first micro-prism structures 432 being mutually parallel in domain 44.A plurality of first in each light extraction region 44 are micro- Prism structure 432 against each itself first of light extraction region 44 at 442, second, 444, third is in 446 and the 4th while Arrangement on one side in 448.In the example shown in Figure 17 and Figure 18, a plurality of first microprisms in each light extraction region 34 Structure 432 is arranged against its first side 442.
As shown in figure 17, light source 42 to emit light, inject in light guide plate 40 by light.In a specific embodiment, light Source 42 can include a plurality of light-emitting diode components or Organic Light Emitting Diode component, but the present invention is not limited thereto.
In a specific embodiment, the beside 406 of example as shown in figure 17, light source 42 close to light guide plate 40 is arranged, The light that light source 42 emits injects light guide plate 40 from beside 406.
In another specific embodiment, light guide plate 40 also has a plurality of perforative openings (not being illustrated in figure).Especially Ground, a plurality of perforative openings are generally arranged along the center line of downside 403.Each opening has from a incidence surface.Light Source 42 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, each luminescence component can It is placed in its corresponding opening.The light that each luminescence component is emitted injects light guide plate from the incidence surface of its corresponding opening 40。
In another specific embodiment, light guide plate 40 also has plurality of openings (not being illustrated in figure).Particularly, this is multiple Several openings are formed on the back side 402 of light guide plate 40 and close to the downside 403 of light guide plate 40.Each opening has certainly A incidence surface.Light source 42 includes a plurality of luminescence components, each luminescence component corresponds to an opening.In practical operation, often One luminescence component can be placed in its corresponding opening.The light that each luminescence component is emitted enters from its corresponding opening Smooth surface injects light guide plate 40.
In a specific embodiment, the section of each the first micro-prism structure 432 can be in inverted V-shape protrusion, U-shaped Type protrusion, the protrusion or groove of V-shape groove, U-shaped groove or other shapes.
As shown in figure 18, light is guided and projected from the front 401 of light guide plate 40 by light guide plate 40, and it is thin to then pass through prism Plate 41 and towards a plurality of keycaps 104 advance.A plurality of first microprism knots in light in each light extraction region 44 of directive The first part light of structure 432 is adjusted via a plurality of first micro-prism structures 432, and then directive corresponds to this light extraction region 44 Keycap 104 (keycap 104 in i.e. respective each light extraction region 34 of directive).It is represented originally not by first micro- rib with dotted line in Figure 18 The travelling route for the light that mirror structure 432 adjusts, the eyes of the light most probably directive user to advance along this route, allows use The eyes of person are uncomfortable.First micro-prism structure 432 is the transmission path that light is adjusted using the principle of total reflection.
As shown in figure 17, a plurality of first micro-prism structures 432 in adjacent light extraction region 44 link together.Namely It says, a plurality of first micro-prism structures 432 in all light extraction regions 44 are distributed in the lower surface of prism thin plate 41 as a whole On 412 most of area.
As shown in figure 18, light guide plate 40 also includes a plurality of smooth steering structures 405.A plurality of formation of smooth steering structure 405 In on the back side of light guide plate 40 402, the light of a plurality of smooth steering structures of directive 405 to be oriented to the front of light guide plate 40 401.A plurality of smooth steering structures 405 can also be formed partially on the back side 402 of light guide plate 40, to light be oriented to Transmission region 1042 towards corresponding keycap 104 advances, as shown in figure 18.A plurality of smooth steering structures 405 can be by leaded light Dotted light color (for example, white) ink is printed on the back side 402 of plate 40 to be formed, and can also be used micro-structure, can also be used plated film Mode is integrally formed with light guide plate 40.But the generation type of a plurality of smooth steering structures 405 is not limited with above-mentioned processing procedure.
Further, as shown in figure 18, the back lighting device 4 of third preferred embodiment according to the present invention also includes the One reflective layer 45 and light shield layer 46.First reflective layer 45 is formed in the upper surface 411 of prism thin plate 41 in addition to correspondence is a plurality of On other regions outside light extraction region 44.First reflective layer 45 is reflecting the light of the first reflective layer of directive 45.Light shield layer 46 It is formed on the first reflective layer 45, to pass through in shutting out the light some light of the first reflective layer 45 to project.
In a specific embodiment, the first reflective layer 45 can be formed by light color inks layer, for example, white ink layer. Light shield layer 46 can be formed by dark oil layer of ink, for example, black ink layer.
Further, as shown in figure 18, the back lighting device 4 of third preferred embodiment according to the present invention also includes the Two reflective layers 48.Second reflective layer 48 is set under the back side 402 of light guide plate 40.Second reflective layer 48 is reflecting directive The light of two reflective layers 48.Second reflective layer 48 can be formed by sheet metal, but be not limited thereto.
In a specific embodiment, as shown in FIG. 19 and 20, a plurality of first micro- ribs in each light extraction region 44 Mirror structure 432 in transverse direction T extend and against its first while 432 (i.e. each light extraction region 44 itself first while 432) it arranges.Prism thin plate 41 is in the second micro- rib also extended with a plurality of T in transverse direction in each light extraction region 44 What the third micro-prism structure 436 and a plurality of L along the longitudinal direction that mirror structure 434, a plurality of L along the longitudinal direction extend extended 4th micro-prism structure 438.A plurality of second micro-prism structures 434 in each light extraction region 44 abut its second side 444 Arrangement.A plurality of third micro-prism structures 436 in each light extraction region 44 are arranged against its third side 446.Each goes out A plurality of 4th micro-prism structures 438 in light region 44 are arranged against its 4th side 448.Each output optical zone of directive in light Second portions of light of a plurality of second micro-prism structures 434 in domain 44 is adjusted via a plurality of second micro-prism structures 434, into And directive corresponds to the keycap 104 (each 44 corresponding keycap 104 of light extraction region of i.e. respective directive) in this light extraction region 44.Light The third portions of light of a plurality of third micro-prism structures 436 in line in each light extraction region 44 of directive is via a plurality of thirds Micro-prism structure 436 adjusts, and then directive corresponds to (i.e. respective each output optical zone of directive of keycap 104 in this light extraction region 44 44 corresponding keycap 104 of domain).Of a plurality of 4th micro-prism structures 438 in light in each light extraction region 44 of directive Four portions of light are adjusted via a plurality of 4th micro-prism structures 438, and then directive corresponds to the keycap 104 in this light extraction region 44 (each 44 corresponding keycap 104 of light extraction region of i.e. respective directive).Thereby, third preferred embodiment according to the present invention Back lighting device 4 can reduce illuminated keyboard 1 keycap 104 lower edge light leakage.First micro-prism structure 432, second micro- rib Mirror structure 434, third micro-prism structure 436 and the 4th micro-prism structure 438 are to adjust light using the principle of refraction Transmission path.
Similarly, the section of the second micro-prism structure 434, third micro-prism structure 436 and the 4th micro-prism structure 438 Can be in inverted V-shape protrusion, inverted u-shaped protrusion, the protrusion or groove of V-shape groove, U-shaped groove or other shapes.
Please refer to Figure 21 and Figure 22.Figure 21 is schematically painted the third preferred embodiment of the present invention with component expanded view Back lighting device 4 one deformation and using the back lighting device 4 illuminated keyboard 1.Figure 22 is illuminated keyboard 1 in Figure 21 along I-I The partial cross sectional views of line.
As shown in figure 21, a plurality of first micro-prism structures 432 in adjacent light extraction region 44 link together, to institute There are a plurality of first micro-prism structures 432 in light extraction region 44 to be distributed in the lower surface of entire prism thin plate 41 as a whole 412.A plurality of first micro-prism structures 432 can be arranged in parallel with T in transverse direction or longitudinal direction L.The model shown in Figure 21 In example, T is arranged in parallel in transverse direction for a plurality of first micro-prism structures 432.There is number mark identical with Figure 17 in Figure 21 The component of note has same or similar structure and function, does not repeat herein.
In conjunction with shown in Figure 21 and Figure 22, prism thin plate 41 is interior with hollow-out parts 418 in each light extraction region 44.Each Hollow-out parts 418 in light extraction region 44 and 44 itself first of this light extraction region at 442, second 444, third side 446 with 4th while between 448 exist retain part 449 (i.e. each light extraction region 44 first while 442, second in 444, third while 446 and the 4th exist between side 448 and hollow-out parts 418 in it and retain part 449).In its reservation of each light extraction region 44 Partly a plurality of first micro-prism structures 432 in 449 still retain.
As shown in figure 22, light is guided from front 401 by light guide plate 40 and is projected, and then passes through prism thin plate 41 and towards again Several keycaps 104 advance.A plurality of first microprism knots in light in its reservation part 449 of each light extraction region 44 of directive The portions of light of structure 432 is adjusted via a plurality of first micro-prism structures 432, and then directive corresponds to the keycap in this light extraction region 44 104 (each 44 corresponding keycap 104 of light extraction region of i.e. respective directive).It is represented with dotted line in Figure 22 original not by a plurality of the The travelling route of the light of one micro-prism structure 432 adjustment, the eyes of the light most probably directive user to advance along this route, Make the eyes of user uncomfortable.Above-mentioned a plurality of first micro-prism structures 432 are to adjust light using the principle of refraction Transmission path.First side 442, second of hollow-out parts 418 and this light extraction region 44 itself in each light extraction region 44 In 444, third, 446 and the 4th existing between side 448 retain a plurality of first micro-prism structures still retained in part 449 432 halation that can be reduced the light leakage around keycap 104, and be further reduced around keycap 104.In Figure 22 have in Figure 18 The component of identical number mark has same or similar structure and function, does not repeat herein.
Please refer to Figure 23.Figure 23 is a deformation of the back lighting device 4 of the third preferred embodiment of the present invention and adopts With the partial cross sectional views of the illuminated keyboard 1 of a deformation of the back lighting device 4 of the present invention.Its hatching of section shown in Figure 23 is determined Justice is the same as the G-G lines in Figure 17.
As shown in figure 23, light guide plate 40 also includes a plurality of smooth steering structures 405.A plurality of formation of smooth steering structure 405 In on the front 401 of light guide plate 40, to scatter the light of a plurality of smooth steering structures of directive 405.A plurality of smooth steering structures 405 can also only be formed partially on the front 401 of light guide plate 40, as shown in figure 23.A plurality of smooth steering structures 405 can be by Dotted light color (for example, white) ink is printed on the back side of light guide plate 40 402 to be formed, and micro-structure can also be used, it can also It is integrally formed with plated film mode and light guide plate 40.The generation type of a plurality of smooth steering structures 405 is not limited with above-mentioned processing procedure.Shape The overall light for being pointed into keycap 104 is allowed to become more soft in a plurality of smooth steering structures 405 on the front 401 of light guide plate 40 With, but brightness and undamped.In Figure 23 with number mark identical with Figure 18 component, have same or similar structure and Function does not repeat herein.
By above to the present invention detailed description, be apparent that the front of its light guide plate of back lighting device according to the present invention The micro-prism structure on the light extraction region of upper corresponding keycap with adjustment light, using shining for back lighting device according to the present invention Keyboard can reduce the light leakage of keycap lower edge, avoid causing the eyes of user uncomfortable, and be further reduced around keycap Halation.
By the above detailed description of preferred embodiments, it is intended to more clearly describe the feature of the present invention and spirit, And not protection scope of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its purpose It is intended to cover various changes and has being arranged in the scope of the claims of the invention to be applied of equality.Cause This, scope of the claims of the invention should illustrate the most wide explanation of work according to above-mentioned, to cause it to cover institute Possible change and the arrangement of tool equality.

Claims (15)

1. a kind of back lighting device for illuminated keyboard, which includes a plurality of keycaps, which is set to On the back lighting device, it is characterised in that the back lighting device includes：
Light guide plate has front, the back side, downside and the upper side opposite with the downside, and definition is parallel to the downside The horizontal direction in face and longitudinal direction perpendicular to the horizontal direction, in defining a plurality of rectangular light extractions on the front Region, each light extraction region corresponds to a keycap and each light extraction region is located under its corresponding keycap, each goes out Light region have close to the downside first while, close to the second of the upper side while, it is adjacent this first while with this second while Third while and it is adjacent this first while with this second while and with the third while opposite the 4th side, the light guide plate is in each light extraction There are a plurality of the first micro-prism structures being mutually parallel, a plurality of first microprisms in each light extraction region in region Structure against each light extraction region itself this first while, this second while, the third while and when the 4th in row on one side Row；And
Light source, to emit light, which injects in the light guide plate, which is guided from the front by the light guide plate and project, And advance towards a plurality of keycaps, a plurality of first micro-prism structures in the light in each light extraction region of directive First part light is adjusted via a plurality of first micro-prism structures, and then respectively corresponding key in each light extraction region of directive Cap.
2. back lighting device according to claim 1, it is characterised in that：The light guide plate also includes a plurality of smooth steering structures, It is formed on the back side, which is being oriented to this just to the light of a plurality of smooth steering structures by directive Face.
3. back lighting device according to claim 1, it is characterised in that：The back lighting device further includes reflective layer, setting It is formed under the back side, the reflective layer is reflecting the light of the directive reflective layer.
4. back lighting device according to claim 1, it is characterised in that：The section of each the first micro-prism structure is in V One of in the group that font is prominent, inverted u-shaped is prominent, V-shape groove and U-shaped groove are formed.
5. back lighting device according to claim 4, it is characterised in that：This in each light extraction region is a plurality of first micro- Prism structure extends along the horizontal direction and is arranged against first side in each light extraction region itself, and the light guide plate is in each Also include a plurality of the second micro-prism structures for extending along the horizontal direction and abutting second side arrangement in a light extraction region, multiple It is several to extend along the longitudinal direction and against the third micro-prism structures and a plurality of along the longitudinal direction of third side arrangement Extend and against the 4th micro-prism structure of the 4th side arrangement, this in the light in each light extraction region of directive is a plurality of Second portions of light of the second micro-prism structure is adjusted via a plurality of second micro-prism structures, so respectively directive each go out The corresponding keycap in light region, the third of a plurality of third micro-prism structures in the light in each light extraction region of directive Portions of light is adjusted via a plurality of third micro-prism structures, and then respectively corresponding keycap in each light extraction region of directive, 4th portions of light of a plurality of 4th micro-prism structures in the light in each light extraction region of directive is a plurality of via this 4th micro-prism structure adjusts, and then respectively corresponding keycap in each light extraction region of directive.
6. back lighting device according to claim 4, it is characterised in that：The back lighting device further includes：
Light shield layer, is set on the front and there are the light shield layer a plurality of holes, each holes to correspond to an output optical zone Domain, the light shield layer is blocking the light from addition to overseas other regions in a plurality of output optical zones are projected.
7. a kind of back lighting device for illuminated keyboard, which includes a plurality of keycaps, which is set to On the back lighting device, it is characterised in that the back lighting device includes：
Light guide plate has front and the back side；
Prism thin plate is set to the upper front of the light guide plate, the prism thin plate have upper surface, lower surface, downside with And the upper side opposite with the downside, and definition is parallel to the horizontal direction of the downside and perpendicular to the horizontal direction Longitudinal direction, it is each in defining a plurality of rectangular light extraction regions on upper surface or the lower surface of the prism thin plate A light extraction region corresponds to a keycap and each light extraction region is located under its corresponding keycap, each light extraction region has Close to the downside first while, close to the second of the upper side while, it is adjacent this first while with this second while third side and It is adjacent this first while with this second while and with the third while the opposite the 4th while, which has in each light extraction region There are a plurality of the first micro-prism structures being mutually parallel, a plurality of first micro-prism structures in each light extraction region abut Each light extraction region itself this first while, this second while, the third while and when the 4th in arrangement on one side；And
Light source, to emit light, which injects in the light guide plate, which is guided from the front by the light guide plate and project, And advance across the prism thin plate and towards a plurality of keycaps, this in the light in each light extraction region of directive is a plurality of The first part light of first micro-prism structure is adjusted via a plurality of first micro-prism structures, so respectively directive each go out The corresponding keycap in light region.
8. back lighting device according to claim 7, it is characterised in that：The section of each the first micro-prism structure is in V One of in the group that font is prominent, inverted u-shaped is prominent, V-shape groove and U-shaped groove are formed.
9. back lighting device according to claim 8, it is characterised in that：A plurality of first micro- ribs in adjacent light extraction region Mirror structure links together.
10. back lighting device according to claim 9, it is characterised in that：A plurality of first micro- ribs in all light extraction regions Mirror structure is distributed the entire upper surface or entire lower surface as a whole, which engraves in having in each light extraction region Empty portion, each light extraction region this first while, this second while, the third while the 4th while and hollow-out parts in it between deposit Retaining part, in one's duty a plurality of first micro-prism structures in reserve part in each light extraction region still retain.
11. back lighting device according to claim 8, it is characterised in that：In each light extraction region this plurality of first Micro-prism structure extends along the horizontal direction and is arranged against first side, which also has in each light extraction region It is a plurality of extend along the horizontal direction and against the second micro-prism structures of second side arrangement, a plurality of prolong along the longitudinal direction Stretch and against the third while arrangement third micro-prism structure and it is a plurality of along the longitudinal direction extend and against the 4th while 4th micro-prism structure of arrangement, the of a plurality of second micro-prism structures in the light in each light extraction region of directive Two portions of light are adjusted via a plurality of second micro-prism structures, and then respectively corresponding key in each light extraction region of directive Cap, the third portions of light of a plurality of third micro-prism structures in the light in each light extraction region of directive is via the plural number A third micro-prism structure adjusts, and then respectively corresponding keycap in each light extraction region of directive, and directive is each in the light 4th portions of light of a plurality of 4th micro-prism structures in a light extraction region is via a plurality of 4th micro-prism structure tune It is whole, and then respectively corresponding keycap in each light extraction region of directive.
12. back lighting device according to claim 8, it is characterised in that：The light guide plate also includes a plurality of smooth steering structures, It is formed on the back side, which is being oriented to this just to the light of a plurality of smooth steering structures by directive Face.
13. back lighting device according to claim 8, it is characterised in that：The back lighting device further includes：
First reflective layer, is formed in the upper surface in addition on other overseas regions of corresponding a plurality of output optical zones, this is first anti- Photosphere is reflecting the light of directive first reflective layer；And
Light shield layer is formed on first reflective layer, the light shield layer to block the light pass through first reflective layer part Light projects.
14. back lighting device according to claim 13, it is characterised in that：The back lighting device further includes：
Second reflective layer is set under the back side, and second reflective layer is reflecting the light of directive second reflective layer.
15. back lighting device according to claim 13, it is characterised in that：The light guide plate also includes that a plurality of light turn to knot Structure is formed on the back side, which is oriented to the light of a plurality of smooth steering structures by directive The front；Alternatively,
The light guide plate includes also a plurality of smooth steering structures, is formed on the front, and a plurality of smooth steering structures are scattering The light of directive a plurality of smooth steering structures.
CN201810557748.XA 2017-09-29 2018-06-01 Back lighting device for illuminated keyboard Pending CN108766818A (en)

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CN211604989U (en) * 2019-06-17 2020-09-29 光宝电子(广州)有限公司 Backlight module and keyboard using same
TWI724949B (en) 2020-07-21 2021-04-11 群光電能科技股份有限公司 Backlight module and illuminated keyboard
CN114765098A (en) * 2021-01-15 2022-07-19 精元电脑股份有限公司 Backlight module for keyboard keys

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Application publication date: 20181106