Composite transparent lighting device
AssigneeSaes Getters S.P.A.
InventorsCalogero Sciascia, Alessio Corazza, Corrado Carretti
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Abstract
A composite transparent lighting device is described. The device has a transparent substrate, an uniform distribution of low concentration dielectric particles, reflective perimeter and perimetral discrete light sources, of improved appearance both in the inoperative state of the device, and at the same time capable of providing good quality lighting when the device is active, i.e. when the discrete light sources on the perimeter of the device are turned on.
Claims11
A composite transparent lighting device comprising a composite transparent element and discrete light sources, said discrete light sources being optically coupled with the composite transparent element perimeter, a reflective frame defining the boundaries of the composite transparent lighting device, said reflective frame being present on at least 80% of the composite transparent lighting device perimeter, wherein:
- said composite transparent element comprises a transparent matrix and an uniform dispersion of dielectric particles,
- the transparent matrix has an optical light extinction coefficient equal or less than 0.009 cm−1 evaluated at 500 μm, and
- a volume concentration of said dielectric particles is comprised between:
- c
- Max
-
- [
- Vol
- Vol
- ]
- =
- {
- 6
- ·
- 10
- -
- 11.2
- ·
- [
- ρ
- 3
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- ]
- -
- 1
- if
-
-
- 10
- -
- 13
- ≤
- ρ
- 6
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- <
- 10
- -
- 7
- 10
- -
- 5.3
- ·
- ρ
- if
-
-
- 10
- -
- 7
- ≤
- ρ
- 6
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- <
- 10
- 10
-
-
- and
-
-
- c
- Min
-
- [
- Vol
- Vol
- ]
- =
- {
- 6
- ·
- 10
- -
- 12.8
- ·
- [
- ρ
- 3
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- ]
- -
- 1
- if
-
-
- 10
- -
- 13
- ≤
- ρ
- 6
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- <
- 10
- -
- 7
- 10
- -
- 6.7
- ·
- ρ
- if
-
-
- 10
- -
- 7
- ≤
- ρ
- 6
-
- (
- m
- 2
- -
- 1
- m
- 2
- +
- 2
- )
- 2
- <
- 10
- 10
- wherein ρ is the average dielectric particle size expressed in μm, m is the ratio between a refractive index of the dielectric particles and a refractive index of the transparent matrix evaluated at 500 nm, Cmax is a maximum volume concentration of said dielectric particles, and Cmin is a minimum volume concentration of said dielectric particles.
Dependencies are inferred from the claim text.