Systems and methods for lighting spring loaded mechanical key switches

Patent metadata

Field	Value
Publication number	US-9959996-B2
Application number	US-201615155660-A
Country	US
Kind code	B2
Filing date	May 16, 2016
Priority date	Aug 29, 2013
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Systems and methods are disclosed that may be implemented to provide keycap lighting to a spring loaded mechanical key switch assembly using a light conductive structure, such as a light pipe, and without requiring a chassis housing of the mechanical key switch assembly to include a dedicated power-consuming light source mounted to or otherwise positioned at the location of the individual key switch assembly chassis housing. Additionally, the disclosed systems and methods may be implemented to use one or more common power-consuming light source/s to simultaneously provide key cap lighting to multiple such spring loaded mechanical key switch assemblies, for example, by feeding light to each key cap though a common light spreader and through an individual non-power consuming light pipe provided for each key switch assembly.

First claim

What is claimed is:

1. A keyboard system, comprising:
a light spreader component comprised of light transmissive material;
one or more light sources positioned to direct light into the light transmissive material of the light spreader component; and
at least one spring loaded mechanical key switch assembly comprising:
a key switch chassis housing having a first end and a second end,
a downwardly depressible key component movably received within the key switch chassis housing and having a first end and a second end, the first end of the depressible key component being linearly movable downward between an extended position and a depressed position relative to the first end of the key switch chassis housing with the first end of the depressible key component being closer to the first end of the key switch chassis housing in the depressed position than in the extended position,
a spring element disposed within the key switch chassis housing when the downwardly depressible key component is in both extended position and depressed condition, the spring element being configured to provide a resilient force to resist downward linear movement of the depressible key component from the extended position to the depressed position within the key switch chassis housing, and
at least one light conductive structure having first and second ends and extending upward through and within the key switch chassis housing from the second end of the key switch chassis housing to the first end of the key switch chassis housing, the first end of the light conductive structure being positioned adjacent the first end of the key switch chassis housing and the second end of the light conductive structure being positioned adjacent the second end of the key switch chassis housing, the light conductive structure being separate and spaced apart from the downwardly depressible key component and held in fixed position relative to the key switch chassis housing;
where a second end of the light conductive structure is positioned to receive light from the light spreader component;
where the light conductive structure is configured to conduct light received from the light spreader upward to the first end of the light conductive structure; and
where the first end of the light conductive structure is configured to emit the conducted light upward from the first end of the light conductive structure.

2. The system of claim 1 , further comprising at least one of digital signal circuitry configured to provide an on/off digital output signal when the depressible key component is depressed downward by a predetermined extent, variable displacement-sensing circuitry configured to detect downward linear displacement of the depressible key component relative to the key switch chassis housing and to provide one or more variable displacement signals that vary in character based on the amount of linear displacement of the depressible key component between the extended position and the depressed position, or a combination thereof.

3. The system of claim 1 , further comprising digital signal circuitry configured to provide an on/off digital output signal when the depressible key component is depressed downward by a predetermined extent.

4. The system of claim 1 , where the depressible key component further comprises a keycap on the first end of the depressible key component; where the light conductive structure comprises a light pipe extending upward adjacent and spaced apart from the downwardly depressible key component; and where the keycap comprises a top surface and an underside surface opposite the top surface, the underside surface of the keycap facing the first end of the light conductive structure to receive the light emitted therefrom, and the top surface of the keycap facing upward toward a user of the keyboard system; where the keycap further comprises one or more light transmissive features extending through the keycap from the underside surface to the top surface of the keycap such that light emitted from beneath the key cap by the light conductive structure is visible by a user of the keyboard system from above the key cap through the light transmissive key features.

5. The system of claim 1 , where the at least one spring loaded mechanical key switch assembly comprises multiple such spring loaded mechanical key switch assemblies that each includes its own corresponding key switch chassis housing that is separate from the key switch chassis housings of all the other mechanical key switch assemblies and that each includes its own corresponding light conducive structure that is separate from the light conductive structures of all the other mechanical key switch assemblies; where the light spreader is a planar light spreader component; where each separate light conductive structure of each given one of the spring loaded mechanical key switch assemblies extends upward from a planar side of the planar light structure to emit the conducted light upward from the first end of the light conductive structure only at the location of its corresponding given spring loaded mechanical key switch assembly; and where a second end of each of the separate light conductive structures of each of the multiple spring loaded mechanical key switch assemblies is positioned to receive light from the same planar light spreader component as is the second end of the light conductive structure of each of the other multiple spring loaded mechanical key switch assemblies.

6. The system of claim 1 , where the light spreader is a substantially planar light spreader component; and where the system further comprises:
a substantially planar printed circuit board (PCB) disposed between the first end of the key switch chassis housing and the light spreader component with a plane of the PCB being oriented in substantially parallel relationship with a plane of the light spreader component, and with a first opening being defined to extend through the PCB that is dimensionally configured to receive the light conductive structure therein; and
where the light conductive structure extends from the key switch chassis housing through the first opening defined in the PCB such that the second end of the light conductive structure is positioned between the PCB and the light spreader component in a position adjacent to the light spreader component to receive the light from the light spreader component.

7. The system of claim 1 , where the depressible key component is linearly movable downward and upward along a single first axis; and where the light conductive structure comprises a light pipe having a second and different axis extending upward in adjacent parallel relationship with the first axis of the downwardly depressible key component.

8. The system of claim 1 , where the second end of the depressible key component is closer to the second end of the key switch chassis housing when the depressible key component is in the extended position than when the depressible key component is in the depressed position.

9. A keyboard system, comprising:
a light spreader component comprised of light transmissive material;
one or more light sources positioned to direct light into the light transmissive material of the light spreader component; and
at least one spring loaded mechanical key switch assembly comprising:
a key switch chassis housing having a first end and a second end,
a downwardly depressible key component movably received within the key switch chassis housing and having a first end and a second end, the first end of the depressible key component being linearly movable between an extended position and a depressed position relative to the first end of the key switch chassis housing with the first end of the depressible key component

Assignees

• Casparian Mark A
• Azor Frank C
• Olmsted Joe A
• Dell Products Lp

Inventors

• Casparian Mark A
• Azor Frank C
• Olmsted Joe A

Classifications

• G02B6/0018

  Redirecting means on the surface of the light guide · CPC title

• H01H2219/062

  Light conductor · CPC title

• H01H9/182

  Illumination of the symbols or distinguishing marks (H01H9/181 takes precedence) · CPC title

• H01H2219/036

  Light emitting elements · CPC title

• G02B6/0028

  Light guide, e.g. taper · CPC title