Optical scanning device, and endoscope, microscope, and projector each provided with the same
An optical scanning device includes an optical fiber, a holding member cantilevering the optical fiber, a first driving device placed on the distal end of the optical fiber and making the optical fiber vibrate in a first direction, and a second driving device placed between the holding member for the optical fiber and the first driving device and making the optical fiber vibrate in a second direction which crosses the first direction.
1. An optical scanning device comprising
an optical fiber,
a holding member cantilevering the optical fiber,
a first driving device placed on a distal end of the optical fiber and making the optical fiber vibrate in a first direction, and
a second driving device placed between the holding member for the optical fiber and the first driving device and making the optical fiber vibrate in a second direction which crosses the first direction;
wherein the first direction in which the optical fiber is made to vibrate by the first driving device is perpendicular to the second direction which crosses the first direction and in which the optical fiber is made to vibrate by the second driving device; and
the optical fiber is made to vibrate in a first-order vibration mode by the first driving device-and the optical fiber is made to vibrate in a second or third-order vibration mode by the second driving device.
2. The optical scanning device according to claim 1 , wherein the first driving device makes the optical fiber resonate to vibrate.
3. The optical scanning device according to claim 1 , wherein the first driving device makes the optical fiber vibrate without resonance.
4. The optical scanning device according to claim 1 , wherein the second driving device makes the optical fiber resonate to vibrate.
5. The optical scanning device according to claim 1 , wherein each of at least one of the first driving device and the second driving device comprises a magnet or magnetic substance, and an electromagnetic coil.
6. The optical scanning device according to claim 5 , wherein an electric signal applied to the second driving device is a periodic signal such as sine wave or triangle wave.
7. The optical scanning device according to claim 1 , wherein each of at least one of the first driving device and the second driving device comprises a piezoelectric device formed into a thin film provided for the optical fiber.
8. An endoscope comprising the optical scanning device according to claim 1 .
9. A microscope comprising the optical scanning device according to claim 1 .
10. A projector comprising the optical scanning device according to claim 1 .
11. A method of driving an optical fiber provided for an optical scanning device and cantilevered by a holding member, comprising
making the optical fiber vibrate in a first direction by a first driving device placed on a distal end of the optical fiber, and
making the optical fiber vibrate in a second direction by a second driving device placed between the holding member for the optical fiber and the first driving device, the second direction crossing the first direction;
wherein the first direction in which the optical fiber is made to vibrate by the first driving device is perpendicular to the second direction in which the optical fiber is made to vibrate by the second driving device; and
the optical fiber is made to vibrate in a first-order vibration mode by the first driving device and the optical fiber is made to vibrate in a second or third-order vibration mode by the second driving device.
12. The method of driving an optical fiber according to claim 11 , wherein the optical fiber is made to resonate to vibrate by the first driving device.
13. The method of driving an optical fiber according to claim 11 , wherein the optical fiber is made to vibrate without resonance by the first driving device.
14. The method of driving an optical fiber according to claim 11 , wherein the optical fiber is made to resonate to vibrate by the second driving device.
15. The method of driving an optical fiber according to claim 11 , wherein an electric signal which is a periodic signal such as sine wave or triangle wave is applied to the second driving device.