US 12,046,428 B2Granted

Backlight keyboard

AssigneeDarfon Electronics Corp.

InventorChao-Yu Chen

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Abstract

A backlight keyboard includes a first keyswitch, a first backlight source, a light guide plate and a first board having first and second holes. The light guide plate is applied to the backlight keyboard and a second backlight keyboard including a second keyswitch, a second backlight source and a second board having third and fourth holes. The second keyswitch on the second backlight keyboard is shifted transversely relative to the first keyswitch on the backlight keyboard to make the first and fourth holes have a first overlapping area. The light guide plate has a first dot structure corresponding to the first and third holes and a second dot structure corresponding to the second and fourth holes except the first overlapping area for guiding light to symbols on the first and second keyswitches. The first dot structure is less than the second dot structure in dot intensity.

Claims10

Dependent claims

A backlight keyboard comprising:

a first language keyswitch set comprising at least one first keyswitch having a first size;
a first board disposed under the first language keyswitch set, the first board having a first hole configuration corresponding to the first keyswitch, the first hole configuration comprising a first hole and a second hole opposite to each other;
a first backlight source disposed under the first board for providing light;
and
a light guide plate applied to the backlight keyboard and a second backlight keyboard, the second backlight keyboard comprising a second language keyswitch set, a second board, and a second backlight source, the second language keyswitch set comprising at least one second keyswitch having a second size less than the first size, the second board being disposed under the second language keyswitch set, the second board having a second hole configuration corresponding to the second keyswitch, the second hole configuration comprising a third hole and a fourth hole opposite to each other, the second backlight source being disposed under the second board for providing light, the second keyswitch on the second backlight keyboard being shifted transversely relative to the first keyswitch on the backlight keyboard to make the first hole and the fourth hole have a first overlapping area, the light guide plate being disposed under the first board or the second board, and the light guide plate having a first dot structure formed corresponding to the first hole and the third hole and having a second dot structure formed at least partially corresponding to the second hole and the fourth hole at least except the first overlapping area, for guiding light to symbols on the first keyswitch and the second keyswitch;
wherein the first dot structure is less than the second dot structure in dot intensity.

3 more elements

A backlight keyboard comprising:

a first language keyswitch set comprising at least one first keyswitch;
a first board disposed under the first language keyswitch set, the first board having a hole configuration corresponding to the first keyswitch, the hole configuration comprising at least one first hole, at least one second hole and at least one third hole, the first hole being opposite to the second hole, and the third hole being formed inward relative to the second hole;
a first backlight source disposed under the first board for providing light;
and
a light guide plate applied to the backlight keyboard and a second backlight keyboard, the second backlight keyboard comprising a second language keyswitch set, a second board, and a second backlight source, the second language keyswitch set comprising at least one second keyswitch having the same size with the first keyswitch, the second board being disposed under the second language keyswitch set, the second board having the hole configuration corresponding to the second keyswitch, the second backlight source being disposed under the second board for providing light, the second keyswitch on the second backlight keyboard being shifted transversely relative to the first keyswitch on the backlight keyboard to make the second hole corresponding to the second keyswitch and the third hole corresponding to the first keyswitch have a first overlapping area and make the third hole corresponding to the second keyswitch and the second hole corresponding to the first keyswitch have a second overlapping area, the light guide plate being disposed under the first board or the second board, and the light guide plate having a first dot structure formed corresponding to the first hole, a second dot structure formed corresponding to the second hole, and a third dot structure formed at least partially corresponding to the third hole except the first overlapping area and the second overlapping area, for guiding light to symbols on the first keyswitch and the second keyswitch;
wherein the third dot structure is larger than the first dot structure and less than the second dot structure in dot intensity.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/081,702Filed 15 Dec 2022 · us provisional application
Priority: TW 11114493224 Nov 2022
Published: US 2023/0197374 A122 Jun 2023
Granted: 23 Jul 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G02B 6/0058
Means for improving the coupling-out of light from the light guide: varying in density, size, shape or depth along the light guide
H01H 13/83
Having a plurality of operating members associated with different sets of contacts, e.g. keyboard: characterised by legends, e.g. Braille, liquid…
G02B 6/0088
Positioning aspects: of the light guide or other optical sheets in the package
G02B 6/004
Provided on the surface of the light guide or in the bulk of it: scattering dots or dot-like elements, e.g. microbeads, scattering particles,…