Back to results
US 11,441,757 B2Granted
Light conversion devices and lighting devices
AssigneeSchott AG
InventorsFrank Gindele, Edgar Pawlowski, Christian Rakobrandt, Christoph Stangl, Thorsten Damm
Life of this patent
Estimating the term…
Abstract
Light conversion devices and lighting devices having such conversion devices are provided. The conversion device includes a light conversion element having a front side and a coating arrangement. The front side is configured to be illuminated with primary light and to emit secondary light having another wavelength or a wavelength range. The coating arrangement is on the front side and has at least one coating layer.
Claims18
A light conversion device, comprising:
- a light conversion element having a front side;
- and
- a coating arrangement on the front side, the coating arrangement having at least one coating layer,
- wherein the light conversion element is configured, on the front side, to be illuminated with primary light and, on the front side, to emit secondary light having another wavelength or a wavelength range from the primary light,
- wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and
- wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm.
3 more elements
A lighting device, comprising:
- a light conversion device having a light conversion element and a coating arrangement on a front side of the light conversion element;
- and
- a light emitting unit configured to emit primary light on front side of the light conversion element, wherein the light conversion element is configured to emit secondary light from the wavelength having another wavelength or a wavelength range from the primary light,
- wherein the coating arrangement has at least one coating layer,
- wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and
- wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm.
3 more elements
A method for producing a light conversion device, comprising:
- providing a base body on a back side of a light conversion element;
- and
- coating a front side of the light conversion element with at least one coating layer in such a manner that light of a specific wavelength, irradiated along an optical axis onto the front side of the light conversion device has a first degree of reflectance and in such a manner that light of another wavelength or of a wavelength range irradiated along the optical axis onto the front side has a second degree of reflectance,
- wherein the light conversion device has a differing degree of reflectance depending on a direction of an incident beam of the primary light or an emitted beam of the secondary light, and
- wherein the degree of reflectance for an angle of incidence of the primary light or an angle of emittance of the secondary light in a range from 60 degrees to a normal line at a wavelength of 440 nm to 460 nm is at most half as large as the degree of reflectance in the wavelength range between 500 to 700 nm.
2 more elements
Dependencies are inferred from the claim text.