Vibration unit and optical detection device
A vibration unit includes a light transmitting member including at least a portion of a detection region of an imaging element, and a vibration element including a vibrating body coupled to the light transmitting member. The light transmitting member includes a central region and a peripheral region located around the central region. The light transmitting member includes a hydrophilic film in the peripheral region thereof.
1. A vibration unit comprising:
a light transmitting member disposed to include at least a portion of a detection region of an optical detection element; and
a vibration element including a vibrating body coupled to the light transmitting member; wherein
the light transmitting member includes a central region and a peripheral region located around the central region;
the light transmitting member includes a hydrophilic film in the peripheral region thereof; and
the vibrating body includes a flange that sticks out of another portion of the vibrating body in plan view, and an outer edge of the flange is outside an outer edge of the another portion of the vibrating body.
2. The vibration unit according to claim 1 , wherein, in the peripheral region of the light transmitting member, the hydrophilic film is in a region including the detection region.
3. The vibration unit according to claim 1 , wherein the light transmitting member includes a water-repellent film in the central region thereof.
4. The vibration unit according to claim 3 , wherein the water-repellent film is at a portion of the light transmitting member located at a vibration antinode.
5. The vibration unit according to claim 1 , wherein the vibration element includes a piezoelectric vibrator disposed on the vibrating body.
6. The vibration unit according to claim 1 , wherein the hydrophilic film is at a portion of the light transmitting member located at a vibration node.
7. The vibration unit according to claim 1 , further comprising a controller electrically connected to the vibration element to control vibration of a combined unit including the light transmitting member and the vibrating body.
8. The vibration unit according to claim 7 , wherein
the controller is configured to vibrate the combined unit such that a plurality of vibration antinodes are located in the light transmitting member; and
the hydrophilic film is at a boundary between adjacent ones of the vibration antinodes.
9. An optical detection device comprising:
the vibration unit according to claim 1 ; and
an optical detection element disposed such that a detection region is included in the light transmitting member.
10. The optical detection device according to claim 9 , wherein the optical detection element includes an imaging element, and the detection region is a field of view.
11. The optical detection device according to claim 9 , wherein, in the peripheral region of the light transmitting member, the hydrophilic film is in a region including the detection region.
12. The optical detection device according to claim 9 , wherein the light transmitting member includes a water-repellent film in the central region thereof.
13. The optical detection device according to claim 12 , wherein the water-repellent film is at a portion of the light transmitting member located at a vibration antinode.
14. The optical detection device according to claim 9 , wherein the vibration element includes a piezoelectric vibrator on the vibrating body.
15. The optical detection device according to claim 9 , wherein the hydrophilic film is at a portion of the light transmitting member located at a vibration node.
16. The optical detection device according to claim 9 , further comprising a controller electrically connected to the vibration element to control vibration of a combined unit including the light transmitting member and the vibrating body.
17. The optical detection device according to claim 16 , wherein
the controller is configured to vibrate the combined unit such that a plurality of vibration antinodes are located in the light transmitting member; and
the hydrophilic film is at a boundary between adjacent ones of the vibration antinodes.
18. A vibration unit comprising:
a light transmitting member disposed to include at least a portion of a detection region of an optical detection element; and
a vibration element including a vibrating body coupled to the light transmitting member; wherein
the light transmitting member includes a central region and a peripheral region located around the central region;
the light transmitting member includes a hydrophilic film in the peripheral region thereof; and
the hydrophilic film is at a portion of the light transmitting member located at a vibration node.
19. A vibration unit comprising:
a light transmitting member disposed to include at least a portion of a detection region of an optical detection element; and
a vibration element including a vibrating body coupled to the light transmitting member; wherein
the light transmitting member includes a central region and a peripheral region located around the central region;
the light transmitting member includes a hydrophilic film in the peripheral region thereof;
the light transmitting member includes a water-repellent film in the central region thereof; and
the water-repellent film is at a portion of the light transmitting member located at a vibration antinode.