Projector and head-up display device
View Patent ↗A projector includes a light source portion that emits laser light, a first reflection portion that is swingable and reflects the laser light from the light source portion, and a second reflection portion that is swingable and reflects the laser light from the first reflection portion. The laser light from the light source portion passes through an opening provided near the second reflection portion and is irradiated to the first reflection portion.
1. A projector comprising:
a light source portion that emits laser light;
a first reflection portion that is swingable and reflects the laser light from the light source portion;
a second reflection portion that is swingable and reflects the laser light from the first reflection portion; and
a base including the second reflection portion and an opening arranged near the second reflection portion; wherein
the second reflection portion, the opening of the base, and the first reflection portion are arranged so that the laser light passes through the opening from a back surface side opposite to a reflection surface of the second reflection portion of the base and the laser light passing through the opening is irradiated to the first reflection portion, and the laser light reflected by the first reflection portion is reflected by the second reflection portion.
2. The projector according to claim 1 , wherein
the first reflection portion scans the laser light in one of a horizontal direction and a vertical direction of a projection image by swinging.
3. The projector according to claim 2 , wherein
the second reflection portion scans the laser light in the other of the horizontal direction and the vertical direction of the projection image by swinging.
4. The projector according to claim 1 , wherein
the first reflection portion and the second reflection portion are arranged such that a reflection surface of the first reflection portion faces the reflection surface of the second reflection portion.
5. The projector according to claim 1 , wherein
the laser light reflected by the first reflection portion is directly irradiated to the second reflection portion.
6. The projector according to claim 1 , further comprising a substrate on which the base is mounted, wherein
the substrate is provided with a through-hole through which the laser light from the light source portion passes and is guided to the opening.
7. The projector according to claim 6 , wherein
the through-hole of the substrate overlaps with the opening of the base and has an opening area larger than an opening area of the opening.
8. The projector according to claim 1 , wherein
the base includes a pair of beam portions that supports the second reflection portion such that the second reflection portion is swingable, and is provided with the opening being adjacent to at least one of the second reflection portion and the pair of beam portions.
9. The projector according to claim 8 , wherein
the opening has an elongated shape that extends in a direction in which the pair of beam portions extends.
10. The projector according to claim 8 , wherein
the opening includes a first opening provided at a first side with respect to the pair of beam portions and the second reflection portion, through which the laser light passes, and a second opening provided at a second side with respect to the pair of beam portions and the second reflection portion, and
the pair of beam portions and the second reflection portion are sandwiched between the first opening and the second opening.
11. The projector according to claim 10 , wherein
the first reflection portion is arranged closer to the first opening with respect to the second reflection portion.
12. The projector according to claim 8 , wherein
the first reflection portion is arranged closer to one of the pair of beam portions at a third side with respect to the second reflection portion, and
the laser light to be irradiated to the first reflection portion passes through a portion of the opening in the vicinity of the other of the pair of beam portions at a fourth side with respect to the second reflection portion.
13. The projector according to claim 1 , wherein
the base is provided with the opening on a line that is an extension of a swing axis of the second reflection portion.
14. The projector according to claim 13 , wherein
the base includes a pair of beam portions that supports the second reflection portion such that the second reflection portion is swingable, and a beam support portion that supports the pair of beam portions, and
the pair of beam portions includes a connection portion having a first end connected to the second reflection portion, and a pair of branch portions branched from a second end of the connection portion and connected to the beam support portion, between which the opening is sandwiched.
15. The projector according to claim 1 , wherein
the second reflection portion has a rectangular shape having a short side that intersects with a swing axis of the second reflection portion in a plan view, and
a longitudinal direction of the second reflection portion is inclined with respect to the swing axis of the second reflection portion.
16. The projector according to claim 1 , further comprising a light guide portion that bends an optical axis of the laser light from the light source portion in a direction toward the first reflection portion, wherein
the opening is arranged on a path of the laser light from the light guide portion toward the first reflection portion.
17. The projector according to claim 1 , wherein
the base is provided with a drive portion that swings the second reflection portion.
18. A head-up display device comprising:
a light source portion that emits laser light to project an image corresponding to a virtual image that a user visually recognizes;
a first reflection portion that is swingable and reflects the laser light from the light source portion;
a second reflection portion that is swingable and reflects the laser light from the first reflection portion; and
a base including the second reflection portion and an opening arranged near the second reflection portion; wherein
the second reflection portion, the opening of the base, and the first reflection portion are arranged so that the laser light passes through the opening from a back surface side opposite to a reflection surface of the second reflection portion of the base and the laser light passing through the opening is irradiated to the first reflection portion, and the laser light reflected by the first reflection portion is reflected by the second reflection portion.