Light blocking member and projection video display device
View Patent ↗A light blocking member according to the present disclosure is for a projection video display device provided with an optical system that projects video light and a projection lens on which the video light is incident, the light blocking member being disposed between the optical system and the projection lens, the light blocking member including: a first light blocking portion that absorbs and converts into heat a part of unnecessary light unnecessary for the projection lens in the video light; and a reflector that reflects, as reflected light, light that is a part of the unnecessary light and that is not absorbed by the first light blocking portion.
1. A light blocking member for a projection video display device provided with an optical system that projects video light and a projection lens on which the video light is incident, the light blocking member being disposed between the optical system and the projection lens, the light blocking member comprising:
a first light blocking portion that absorbs and converts into heat a part of unnecessary light unnecessary for the projection lens in the video light; and
a reflector that reflects, as reflected light, light that is a part of the unnecessary light and that is not absorbed by the first light blocking portion.
2. The light blocking member according to claim 1 , wherein the reflector is disposed to be inclined at a predetermined inclination angle with respect to the light blocking member.
3. The light blocking member according to claim 1 , wherein the reflector has a curved surface having a predetermined curvature.
4. The light blocking member according to claim 1 , comprising a plurality of reflectors each being the reflector.
5. The light blocking member according to claim 4 , wherein the plurality of reflectors has predetermined inclination angles different from each other, and reflects the light not absorbed by the first light blocking portion in different directions, the predetermined inclination angles each being the predetermined inclination angle.
6. A projection video display device comprising:
an optical system that projects video light;
a projection lens on which the video light is incident; and
the light blocking member according to claim 1 .
7. The projection video display device according to claim 6 , wherein the projection lens and the light blocking member are made of a same material.
8. The projection video display device according to claim 6 , further comprising a heat dissipation member including: a second light blocking portion that absorbs reflected light reflected by the reflector of the light blocking member; and a heat dissipator that dissipates heat of the second light blocking portion to outside air.
9. The projection video display device according to claim 8 , wherein at least two of the light blocking member, the heat dissipation member, and the projection lens are made of a same material.