Optical sensor arrangement
View Patent ↗An optical sensor arrangement comprises an optoelectronic device covered by a cover arrangement and being configured to emit or detect at least electromagnetic radiation with a first wavelength through an aperture of the cover arrangement. The optical sensor arrangement further comprises a mirror arrangement arranged between the optoelectronic device and the aperture and comprising a wavelength selective mirror with a passband and a stopband. The passband includes a first wavelength range including the first wavelength, the stopband includes a second wavelength range corresponding to visible light or vice versa.
1. An optical sensor arrangement comprising an optoelectronic device and a cover arrangement covering the optoelectronic device, wherein the optoelectronic device is configured to emit or detect at least electromagnetic radiation with a first wavelength through an aperture of the cover arrangement; and
a mirror arrangement arranged between the optoelectronic device and the aperture, the mirror arrangement comprising a wavelength selective mirror with a passband and a stopband, wherein
the optoelectronic device has an active surface extending along a first principal plane and the wavelength selective mirror extends along a second principal plane;
the second principal plane and the first principal plane include an angle with an absolute value being greater than zero degrees and less than ninety degrees;
the mirror arrangement further comprises
an optically opaque element extending along a fourth principal plane being perpendicular to the first principal plane;
the passband includes a first wavelength range containing the first wavelength and the stopband includes a second wavelength range corresponding to visible light or vice versa;
the active surface and the opaque element are located at opposite sides with respect to the wavelength selective mirror;
the wavelength selective mirror is adapted to direct visible light entering the optical sensor arrangement through the aperture to the opaque element; and
the wavelength selective mirror is configured to direct visible light being reflected from the opaque element to the aperture.
2. The optical sensor arrangement according to claim 1 , wherein
the passband includes the first wavelength range and the stopband includes the second wavelength range; and
the cover arrangement extends along a third principal plane being parallel to the first principal plane.
3. The optical sensor arrangement according to claim 1 , wherein
the stopband includes the first wavelength range and the passband includes the second wavelength range; and
the cover arrangement extends along a third principal plane being perpendicular to the first principal plane.
4. The optical sensor arrangement according to claim 1 , wherein
the mirror arrangement comprises a first prism body having a shape of a first prism with right triangles as bases and a second prism body having the shape of a second prism with right triangles as bases,
the wavelength selective mirror is arranged between a first side face of the first prism body containing the hypotenuses of the bases of the first prism and a first side face of the second prism body containing the hypotenuses of the bases of the second prism.
5. The optical sensor arrangement according to claim 4 , wherein the first and the second prism body comprise an optically translucent or transparent material.
6. The optical sensor arrangement according to claim 4 , wherein
the mirror arrangement comprises an optically opaque element arranged on a second side face of the first prism body;
the optoelectronic device faces a second side face of the second prism body; and
the aperture faces a third side face of the first prism body or a third side face of the second prism body.
7. The optical sensor arrangement according to claim 6 , wherein
the passband includes the first wavelength range and the stopband includes the second wavelength range; and
the aperture faces the third side face of the first prism body.
8. The optical sensor arrangement according to claim 6 , wherein
the stopband includes the first wavelength range and the passband includes the second wavelength range; and
the aperture faces the third side face of the second prism body.
9. The optical sensor arrangement according to claim 4 , wherein the wavelength selective mirror is permanently connected to the first side face of the first prism body and to the first side face of the second prism body.
10. The optical sensor arrangement according to claim 4 , wherein the wavelength selective mirror is deposited on the first side face of the first prism body and the first side face of the second prism body is glued to the wavelength selective mirror or vice versa.
11. The optical sensor arrangement according to claim 1 , wherein the cover arrangement comprises an optically translucent or transparent cover plate and an optically opaque cover layer arranged on a surface of the cover plate facing the mirror arrangement, wherein the cover layer has an aperture exposing an area of the cover plate defining the aperture of the cover arrangement.
12. The optical sensor arrangement according to claim 1 , wherein the wavelength selective mirror is implemented as a dielectric mirror or a dichroic filter.
13. The optical sensor arrangement according to claim 1 , wherein the optoelectronic device is configured to emit at least electromagnetic radiation with the first wavelength through the aperture and wherein the optical sensor arrangement further comprises:
a further optoelectronic device, wherein the cover arrangement covers the further optoelectronic device and the further optoelectronic device is configured to detect at least electromagnetic radiation with the first wavelength entering the optoelectronic device through a further aperture of the cover arrangement; and
a further mirror arrangement arranged between the further optoelectronic device and the further aperture, wherein
the further mirror arrangement comprises a further wavelength selective mirror with a further passband and a further stopband, and
the further passband includes the first wavelength range and the further stopband includes the second wavelength range or vice versa.
14. The optical sensor arrangement according to claim 13 , wherein
the further mirror arrangement further comprises a further optically opaque element, wherein
the further wavelength selective mirror is adapted to direct visible light entering the optical sensor arrangement through the further aperture to the further opaque element.
15. An optical sensor arrangement comprising:
an optoelectronic device and a cover arrangement covering the optoelectronic device, wherein the optoelectronic device is configured to emit or detect at least electromagnetic radiation with a first wavelength through an aperture of the cover arrangement; and
a mirror arrangement arranged between the optoelectronic device and the aperture, the mirror arrangement comprising a wavelength selective mirror with a passband and a stopband; wherein
the optoelectronic device has an active surface extending along a first principal plane and the wavelength selective mirror extends along a second principal plane;
the second principal plane and the first principal plane include an angle with an absolute value being greater than zero degrees and less than ninety degrees;
the mirror arrangement further comprises an optically opaque element extending along a fourth principal plane being perpendicular to the first principal plane;
the passband includes a first wavelength range containing the first wavelength and the stopband includes a second wavelength range corresponding to visible light or vice versa;
the active surface and the opaque element are located at opposite sides with respect to the wavelength selective mirror;
the wavelength selective mirror is adapted to direct visible light entering the optical sensor arrangement through the aperture to the opaque element; and
the cover arrangement comprises an optically opaque cover layer;
the opaque cover layer and the opaque element of the mirror arrangement have at least approximately the same color, wherein
the opaque element is configured to reduce the visibility of the aperture from outside.
16. An optical sensor arrangement comprising:
an optoelectronic device and a cover arrangement covering the optoelectronic device, wherein the optoelectronic device is configured to emit or detect at least electromagnetic radiation with a first wavelength through an aperture of the cover arrangement; and
a mirror arrangement arranged between the optoelectronic device and the aperture, the mirror arrangement comprising a wavelength selective mirror with a passband and a stopband; wherein
the optoelectronic device has an active surface extending along a first principal plane and the wavelength selective mirror extends along a second principal plane;
the second principal plane and the first principal plane include an angle with an absolute value being greater than zero degrees and less than ninety degrees;
the mirror arrangement further comprises an optically opaque element extending along a fourth principal plane being perpendicular to the first principal plane;
the passband includes a first wavelength range containing the first wavelength and the stopband includes a second wavelength range corresponding to visible light or vice versa;
the active surface and the opaque element are located at opposite sides with respect to the wavelength selective mirror;
the wavelength selective mirror is adapted to direct visible light entering the optical sensor arrangement through the aperture to the opaque element; and
the mirror arrangement comprises a first prism body having a shape of a first prism with right triangles as bases and a second prism body having the shape of a second prism with right triangles as bases;
the wavelength selective mirror is arranged between a first side face of the first prism body containing the hypotenuses of the bases of the first prism and a first side face of the second prism body containing the hypotenuses of the bases of the second prism;
the mirror arrangement comprises an optically opaque element arranged on a second side face of the first prism body;
the optoelectronic device faces a second side face of the second prism body; and
the aperture faces a third side face of the first prism body or a third side face of the second prism body.