An input operation device according to the present disclosure includes first to third light-emitting sections, a first light guide body, and a second light guide body. A lower end of the first light guide body faces the first light-emitting section and the second light-emitting section. The first mark emits light on the first light guide body when light is incident on the first light guide body from the first light-emitting section, and the second mark emits light on the first light guide body when light is incident on the first light guide body from the second light-emitting section. The upper surface section of the second light guide body emits light when light is incident on the second light guide body from the third light-emitting section. At least one of the first light-emitting section, the second light-emitting section, and the third light-emitting section can change light emission luminance.

A push-button switch (1) is arranged such that, once a user presses an operation button (8), a switch body (20) performs an operation, and light from an LED (21) passes through a transmission plate (70) and then illuminates the operation button (8). A structure (700) is provided on a lower surface (70b) of the transmission plate (70) to refract the light from the LED (21) so that the refracted light is reflected within the transmission plate (70) and then guided to an upper circumferential wall (71) of the transmission plate (70).

A keyboard includes a circuit board having an upper surface, a lower surface opposite to the upper surface, and a plurality of cut-out portions, a plurality of key modules positioned on the upper surface and over the plurality of cut-out portions, and a plurality of light sources installed on the lower surface of the circuit board, wherein at least a portion of at least one light source is positioned in a corresponding cut-out portion. Each light source includes a light emitting portion coupled to the second circuit layer. At least some of the light emitting portion is disposed in the cut-out portion beneath and bounded by the key module.

In one embodiment, a light guide includes an emitter and a light guide body optically coupled to the emitter. The light guide body may define a cylindrical body that tapers along an angled plane from a top end towards a bottom end. The bottom end may define a light entrance to the light guide body.

A light-emitting keyboard includes a membrane circuit board including a lower layer, an upper layer and a light-guiding spacer layer arranged between lower layer, an upper layer and defining therein a tapered through hole, a substrate holding membrane circuit board, a key assembly including key cap, a linkage coupled between key cap and substrate and an elastic element supported between key cap and membrane circuit board, and a light source for emitting light into the light-guiding spacer layer. The light-guiding spacer layer uses its thickness to isolate the lower layer and the upper layer and its tapered through hole to provide room for a triggering stroke for enabling the upper layer to electrically contact the lower layer second circuit in producing a corresponding switching signal each time the key assembly is pressed. Thus, the light-emitting keyboard achieves the characteristics of low profile, low manufacturing cost, and simple assembly process.

Disclosed herein is an optical device having a light source and a viscoelastic lightguide. Light from the light source enters the viscoelastic lightguide and is transported within the lightguide by total internal reflection. The viscoelastic lightguide may comprise a pressure sensitive adhesive. The optical device may be used in a variety of constructions wherein the device emits light being transported within the viscoelastic lightguide. Constructions include those used for signs, markings, illumination devices, display devices, keypad assemblies and tail light assemblies for vehicles.

A backlight module includes a reflection layer, a light guide plate and a mask layer. The light guide plate is disposed on the reflection layer and includes a light guide body, a first and a second opening structures. The first opening structure including a first closed end, the first closed end has two first branches. The second opening structure includes a second closed end, the first closed end and the second closed end face each other, at least one of the two first branches of the first closed end partially overlaps the second closed end along a first axis, the two first branches are located on two sides of the second closed end along a second axis, and the first axis is perpendicular to the second axis. The light guide plate is disposed between the reflection layer and the mask layer.

A keyboard device includes a keyboard module and an illumination module. The keyboard module includes plural first keys and at least one second key. The illumination module includes a light guide plate and a circuit board. The light guide plate includes plural first mapping zones and a second mapping zone. The first mapping zones are located under the corresponding first keys. The second mapping zone is located under the second key. Moreover, at least one side-view light-emitting element and at least one top-view light-emitting element are installed on the circuit board. The side-view light-emitting element emits a first light beam. The top-view light-emitting element emits a second light beam. The first light beam is extracted through the corresponding first mapping zone and transferred to the corresponding first key. The second light beam is transferred to the second key.

The present invention relates to a portable electronic device including a backlight module having a first light output surface toward a foreside and a second light output surface opposite to the first light output surface and toward a rear side, and providing a first surface light source and a second surface light source through the first light output surface and the second light output surface respectively; a lightening unit configured in proximity to the first light output surface and lightened by receiving the first surface light source; and a lightening pattern layer configured in proximity to the second light output surface, receiving the second surface light source and including a mask part and a light-transmittable part formed with a mark pattern, wherein the second surface light source is masked by the mask part and passes through the light-transmittable part whereby the mark pattern is accordingly lightened and defined.

A button deck assembly includes a button deck having at least one mechanical pushbutton, the pushbutton includes a lens cap, a liquid-crystal display (LCD) panel, and an optical block configured to transmit images from the LCD panel for display through the lens cap, a bottom surface of the optical block is positioned on the LCD panel, an air gap is defined between a top surface of the optical block and the lens cap. The assembly also includes a printed circuit board (PCB) assembly defining a PCB aperture, the PCB aperture is sized to receive the optical block, and an elastomeric membrane defining a membrane aperture sized to receive the optical block, the optical block extends from the LCD panel through the PCB and membrane apertures, the membrane channels fluid flow to outer edges of the membrane and around the PCB assembly and the LCD panel.