Keypad lighting arrangement
First Claim
1. A keypad lighting arrangement adapted to transmit at least a portion of light emitted from light sources through a keypad so as to facilitate visual recognition of information expressed on keypad members of a keypad, comprising:
- light sources;
a photoluminescent diffusion sheet arranged over the light sources and containing a photoluminescent material for converting light from the light sources and a light-diffusing material for diffusing emitted from the light sources; and
a keypad member over the photoluminescent diffusion sheet, wherein the light sources emit blue wavelength light and the photoluminescent diffusion sheet absorbs at least a portion of the blue wavelength light and converts the blue wavelength of light to a different wavelength of light.
1 Assignment
0 Petitions
Accused Products
Abstract
A keypad lighting arrangement adapted to transmit at least a portion of light emitted from light sources through a keypad so as to facilitate visual recognition of information expressed on keypad members of a keypad includes light sources, a photoluminescent diffusion sheet arranged over the light sources and containing a photoluminescent material for converting light from the light sources and a light-diffusing material for diffusing emitted from the light sources, and a keypad member over the photoluminescent diffusion sheet, wherein the light sources emit blue wavelength light and the photoluminescent diffusion sheet absorbs at least a portion of the blue wavelength light and converts the blue wavelength of light to a different wavelength of light.
78 Citations
20 Claims
-
1. A keypad lighting arrangement adapted to transmit at least a portion of light emitted from light sources through a keypad so as to facilitate visual recognition of information expressed on keypad members of a keypad, comprising:
-
light sources;
a photoluminescent diffusion sheet arranged over the light sources and containing a photoluminescent material for converting light from the light sources and a light-diffusing material for diffusing emitted from the light sources; and
a keypad member over the photoluminescent diffusion sheet, wherein the light sources emit blue wavelength light and the photoluminescent diffusion sheet absorbs at least a portion of the blue wavelength light and converts the blue wavelength of light to a different wavelength of light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A keypad lighting arrangement, comprising:
-
a keypad provided with keypad members;
a circuit board having a plurality of light sources emitting a first wavelength of light;
a resin sheet including a photoluminescent material and a light-diffusing material, wherein the photoluminescent material sheet absorbs at least a portion of the first wavelength of light and converts the first wavelength of light to a second wavelength of light different from the first wavelength of light; and
a transparent dome sheet interposed between the circuit board and the resin sheet, the transparent dome sheet having contact keys.
-
-
11. A keypad lighting arrangement, comprising:
-
a keypad having information expressed on keypad members;
light sources emitting a first wavelength of light;
photoluminescent materials for absorbing at least a portion of the first wavelength of light and converting the first wavelength of light to a different wavelength of light; and
a dome sheet interposed between the keypad and the light sources, the dome sheet having contact keys and positioned to receive the first wavelength of light prior to the photoluminescent material absorbing at least a portion of the first wavelength. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification