Illuminable vehicle sunroof
OwnerJean-Baptiste LAUDEREAU, Mathieu BERARD +2inventors
InventorsJean-Baptiste LAUDEREAU, Mathieu BERARD, Emmanuel MIMOUN, Stefan ALTMEYER
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Abstract
A sunroof that can be illuminated by a light source, includes a first glass sheet and a second glass sheet, between which a lamination interlayer and a holographic layer including a thick reflection hologram are placed, the hologram being suitable for diffracting, towards the outside of the sunroof, via the second glass sheet, at least some ray s guided in the sunroof.
Claims20
A laminated vehicle sunroof comprising:
- a first outer sheet of transparent mineral glass having a first main face and a second opposite main face, known as face F2, with a refractive index nv at a first wavelength λ1 in the visible range,
- a second, inner, glass sheet of transparent organic or mineral glass, with a refractive index n0 at λ1, having a third main face and an opposite fourth main face,
- between the second main face and the third main face, a dielectric lamination interlayer of polymer material, comprising at least one lamination interlayer,
- the sunroof comprising, between the second main face and the third main face, in this order moving away from the second main face:
- one or more transparent, dielectric upper intermediate layers with given refractive indices in the visible range,
- the first outer sheet being tinted and/or from the upper intermediate layer a first layer being tinted,
- when several upper intermediate layers are tinted, the first tinted layer is the tinted layer closest to the third main face,
- a first transparent dielectric holographic layer comprising a first functional zone with a first thick hologram, diffracting at λ1, the first functional zone having a refractive index nH1 at λ1,
- n2 being the lowest refractive index at λ1 in the visible range:
- a) from the refractive indices of the upper intermediate layer(s) between the first holographic layer excluded and up to and including the first tinted layer,
- b) or in the absence of a tinted upper intermediate layer or in the absence of an upper intermediate layer n2 being equal to nv,
- the sunroof being adapted to receive a light beam in the second glass sheet, light rays injected at λ1 into the second glass sheet, with a range θ1 of angles of incidence in the second glass sheet, being guided in the sunroof until reaching the first hologram and with θ1 such that arcsin (n2/n0)≤θ01 ≤arcsin (n1/n0),
- the optical function of said first hologram being selected such that a portion of the rays guided in the sunroof reach the first hologram and are diffracted and extracted from the sunroof on the side of the fourth main face F4, the diffracted rays being defined by a range of angles of incidence θ2 on the fourth main face F4 and lying between-arcsin (1/n0) and arcsin (1/n0).
The sunroof according to claim 17 wherein at least one lower intermediate layer is an adhesive layer in contact with the first holographic layer and/or at least one upper intermediate layer is an adhesive layer in contact with the first holographic layer.
The sunroof according to claim 17 any comprises comprising a polychromatic light source, optically coupled to the second inner glass sheet, the polychromatic light source emitting:
- at said first wavelength λ1 selected from within a first range which is in a first range LB1 from 450 nm up to 510 nm excluded or in a second range LB2 from 510 nm up to 560 nm excluded, or in a third range LB3 from 560 nm to 650 nm,
- at a second main wavelength λ2 distinct from λ1 selected in a second range distinct from the first range and which is in the first, second or third ranges LB1, LB2, LB3.
Dependencies are inferred from the claim text.