Projector and screen
View Patent ↗This projector includes a laser light generation portion, a projection portion scanning laser light, and a projection screen. The projection screen includes a lens member including a plurality of lens portions splitting the laser light and a diffusion member arranged to be opposed to the lens member, having an incident surface and a diffusion portion. The diffusion portion of the diffusion member is arranged at a position apart by a distance larger than the focal length of the lens member along an optical axis with respect to the optical principal surface of the lens member.
1. A projection apparatus comprising:
a laser light output portion that outputs a laser light;
a scanning portion that scans the laser light; and
a projection portion on which a scanned laser light by the scanning portion is projected includes a lens member and a diffusion member, wherein the lens member includes a lens portion that splits a scanned laser light and the diffusion member includes an incident surface where a split laser light is incident, a diffusion portion that diffuses the split laser light, and an emitting surface where a diffused laser light is emitted, and
the diffusion portion has a distance that is not less than a focal length of the lens member and is not more than about twice the focal length of the lens member between the diffusion portion and the lens member, and
a distribution density of the diffusion portion in a vicinity of the emitting surface is higher than that in a vicinity of the incident surface in the diffusion member.
2. The projection apparatus according to claim 1 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions which are adjacent to each other is smaller than a diameter of the laser light.
3. The projection apparatus according to claim 1 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions which are adjacent to each other is not more than about one third the diameter of the laser light.
4. The projection apparatus according to claim 1 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions which are adjacent to each other is not more than about one sixth the diameter of the laser light and not less than about one tenth the diameter of the laser light.
5. The projection apparatus according to claim 1 , wherein
the lens portion is convex.
6. The projection apparatus according to claim 1 , wherein
the lens member comprises a plurality of lens portions, and
the lens member has at least two different focal lengths.
7. The projection apparatus according to claim 1 , wherein
the lens member comprises a plurality of lens portions, and
the distances between centers of the lens portions which are adjacent to each other are different.
8. The projection apparatus according to claim 1 , wherein
the diffusion member has directivity of diffusing the split laser light to the emitting surface.
9. The projection apparatus according to claim 8 , wherein
the diffusion member permeates, refracts, or polarizes a light that is incident from the emitting surface side of the diffusion member in the diffusion member.
10. The projection apparatus according to claim 9 , wherein
the diffusion member permeates, refracts, or polarizes the light toward the incident surface side of the diffusion member.
11. The projection apparatus according to claim 1 , wherein
a plurality of diffusion portions are provided, and
a plurality of lens portions are provided, and
a distance between the diffusion portions is smaller than a distance between centers of the plurality of lens portions.
12. The projection apparatus according to claim 1 , wherein
the diffusion portion has a distance of about twice the focal length of the lens member between the diffusion portion and the lens member.
13. A projection module comprising:
a lens member and a diffusion member, wherein
the lens member includes a lens portion that splits a laser light and
the diffusion member includes an incident surface where a split laser light is incident, a diffusion portion that diffuses the split laser light, and an emitting surface where a diffused laser light is emitted, and
the diffusion portion has a distance that is not less than a focal length of the lens member and is not more than about twice the focal length of the lens member between the diffusion portion and the lens member, and
a distribution density of the diffusion portion in a vicinity of the emitting surface is higher than that in a vicinity of the incident surface in the diffusion member.
14. The projection module according to claim 13 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions is smaller than a diameter of the laser light.
15. The projection module according to claim 13 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions which are adjacent to each other is not more than about one third the diameter of the laser light.
16. The projection module according to claim 13 , wherein
the lens member includes a plurality of lens portions, and
a distance between centers of the lens portions which are adjacent to each other is not more than about one sixth the diameter of the laser light and not less than about one tenth the diameter of the laser light.
17. The projection module according to claim 13 , wherein the lens portion is convex.
18. The projection module according to claim 13 , wherein
the diffusion portion has a distance of about twice the focal length of the lens member between the diffusion portion and the lens member.