1. A piezoelectric vibrator comprising:
a piezoelectric element including:
a first piezoelectric element layer having a bisected top electrode formed thereon;
a second piezoelectric element provided under the first piezoelectric element layer and having an internal ground electrode formed thereon; and
a third piezoelectric element provided under the second piezoelectric element layer, the third piezoelectric element having an internal bisected electrode symmetrical with the top electrode with respect to a stack plane, and a bottom electrode formed in a plane opposite to the plane where the internal electrode is formed;
a side electrode including:
first and second side electrodes for electrically connecting electrode patterns formed in a diagonal direction among the electrode patterns formed in the first and third piezoelectric element layers of the piezoelectric element; and
a third side electrode for electrically connecting the internal ground electrode of the second piezoelectric element layer to the bottom electrode of the third piezoelectric element layer; and
a power transmission member formed in one side of the piezoelectric element to transmit vibration generated from the piezoelectric element to the outside.
2. A piezoelectric vibrator comprising:
a piezoelectric element including:
an N-layer stacked structure including a plurality of first piezoelectric element layers where bisected top electrodes are formed and a plurality of second piezoelectric element layers where internal ground electrodes are formed, the first piezoelectric element layers and the second piezoelectric element layers being alternately stacked in sequence; and
an M-layer stacked structure provided under the N-layer stacked structure, the M-layer stacked structure having a plurality of third piezoelectric element layers where internal bisected electrodes are formed symmetrical with the top electrodes of the first piezoelectric element of the N-layer stacked structure with respect to a stack plane, and a plurality of second piezoelectric element layer stacked on the N-layer stacked structure, the third piezoelectric element layers and the second piezoelectric element layers being alternately stacked downward in sequence, the third piezoelectric element layer being disposed at the lowermost of the M-layer stacked structure;
a side electrode including:
first and second side electrodes for electrically connecting electrode patterns disposed in a diagonal direction among the electrode patterns formed in the N-layer and M-layer stacked structures of the piezoelectric element; and
a third side electrode for electrically connecting the internal ground electrodes of the N-layer and M-layer stacked structures and the bottom electrode of the M-layer stacked structure; and
a power transmission member formed in one side of the piezoelectric element to transmit vibration generated from the piezoelectric element to the outside.
3. The piezoelectric vibrator according to claim 1,
wherein each of the top electrode and the internal electrode of the piezoelectric element comprises a bent pattern such that one ends adjacent to one another among the bisected patterns extend up to an outside of the piezoelectric element in an opposite direction from a center portion of the piezoelectric element.
4. The piezoelectric vibrator according to claim 3,
wherein portions of the internal ground electrode and the bottom electrode of the piezoelectric element extend up to the outside of the piezoelectric element.
5. The piezoelectric vibrator according to claim 4,
wherein predetermined portions of the internal ground electrode and the bottom electrode extend up to an edge of the piezoelectric element, the third side electrode being formed in a lateral end of the piezoelectric element.
6. The piezoelectric vibrator according to claim 4,
wherein predetermined portions of the internal ground electrode and the bottom electrode extend up to a lateral end of the piezoelectric element, the third side electrode being formed in the same side as the side where the first or second side electrode is formed.
7. The piezoelectric vibrator according to claim 1,
wherein each of the top electrode and the internal electrode of the piezoelectric element comprises a bent pattern such that one ends adjacent to one another among the bisected patterns extend up to an outside of the piezoelectric element in an opposite direction from a center portion of the piezoelectric element, and another ends that are not adjacent to one another extend up to an outside of the piezoelectric element.
8. The piezoelectric vibrator according to claim 7,
wherein the internal ground electrode and the bottom electrode of the piezoelectric element extend up to lateral outsides of the piezoelectric element, and the third side electrode is formed in the same side as the side where the first or second side electrode is formed.
9. The piezoelectric vibrator according to claim 3,
wherein the bent pattern is bent at a right angle.
10. The piezoelectric vibrator according to claim 7,
wherein the bent pattern is bent at a right angle.
11. The piezoelectric vibrator according to claim 3, further comprising:
a solder dot for applying an electric signal to nodal points of the top electrode and the bottom electrode of the piezoelectric element.
12. The piezoelectric vibrator according to claim 7, further comprising:
a solder dot for applying an electric signal to nodal points of the top electrode and the bottom electrode of the piezoelectric element.
13. The piezoelectric vibrator according to claim 11, further comprising:
a solder dot for applying an external AC voltage the bent portion of the top electrode of the piezoelectric element.
14. The piezoelectric vibrator according to claim 12, further comprising:
a solder dot for applying an external AC voltage to the bent portion of the top electrode of the piezoelectric element.
15. The piezoelectric vibrator according to claim 13, further comprising:
a solder dot for applying an external AC voltage to the center portion of the bottom electrode of the piezoelectric element.
16. The piezoelectric vibrator according to claim 14, further comprising:
a solder dot for applying an external AC voltage to the center of the bottom electrode of the piezoelectric element.
17. The piezoelectric vibrator according to claim 1, comprising:
wherein the side electrode extends to an inside of the side where the bottom electrode is not formed, without contacting the bottom electrode, such that solder dots are formed on the bottom surface of the piezoelectric element to apply an external AC voltage.
18. The piezoelectric vibrator according to claim 17,
wherein the external AC voltage is applied using an FPCB, the FPCB being connected to the solder dots formed on the bottom surface of the piezoelectric element.
19. The piezoelectric vibrator according to claim 2,
wherein the N-layer stacked structure comprises four or more even number of the piezoelectric elements, and the M-layer stacked structure comprises three or more odd number of the piezoelectric elements.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fluorescent substrate comprising:
a base having a reflective surface; and
a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
wherein the base is a fluorescent wheel which is in the form of a disc, at a predetermined position on which a ring-like groove is formed, wherein the minute reflective structure is formed on a bottom face of the ring-like groove, and wherein the fluorescent layer is deposited within the ring-like groove; and
wherein a side surface of each of the projections is paraboloid-shaped.
2. The fluorescent substrate of claim 1, wherein a height of each projection in the minute reflective structure is equal in value to a thickness of the fluorescent layer.
3. The fluorescent substrate of claim 1, wherein a height of each projection in the minute reflective structure is smaller in value than a thickness of the fluorescent layer.
4. The fluorescent substrate of claim 1, wherein a red fluorescent layer that emits red wavelength band light, a green fluorescent layer that emits green wavelength band light, and a blue fluorescent layer that emits blue wavelength band light are disposed in order within the ring-like groove in a peripheral direction.
5. A light source device comprising an exciting light source and the fluorescent substrate of claim 1.
6. A light source device comprising:
an exciting light source;
the fluorescent substrate of claim 1; and
a wheel motor for rotating the fluorescent wheel which is the fluorescent substrate.
7. The fluorescent substrate of claim 1, wherein a red fluorescent layer that emits red wavelength band light, a green fluorescent layer that emits green wavelength band light, and a diffusion transmission layer that diffuses light and allows the light to pass therethrough are disposed in order within the ring-like groove of the base which is the fluorescent wheel in a peripheral direction.
8. A light source device comprising:
an exciting light source which is a blue laser beam generator whose optical axis is disposed so as to be perpendicular to the fluorescent substrate; and
the fluorescent substrate of claim 7;
wherein a dichroic mirror which allows emitted light from the exciting light source to pass therethrough and reflects fluorescence from the fluorescent substrate is disposed between the exciting light source and the fluorescent substrate.
9. A projector comprising:
a display element;
the light source device of claim 6;
a light source side optical system that guides light emitted from the light source device to the display element;
a projection side optical system that projects projection light from the display element to a screen; and
a projector controller.
10. A fluorescent substrate comprising:
a base having a reflective surface; and
a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section; and
wherein a height of each projection in the minute reflective structure is equal in value to a thickness of the fluorescent layer from a bottom surface to a top surface of the fluorescent layer.
11. A light source device comprising an exciting light source and the fluorescent substrate of claim 10.
12. A projector comprising:
a display element;
the light source device of claim 11;
a light source side optical system that guides light emitted from the light source device to the display element;
a projection side optical system that projects projection light from the display element to a screen; and
a projector controller.
13. A projector comprising:
a display element;
a light source device,
a light source side optical system that guides light emitted from the light source device to the display element;
a projection side optical system that projects projection light from the display element to a screen; and
a projector controller;
wherein the light source device comprises an exciting light source and a fluorescent substrate; and
wherein the fluorescent substrate comprises:
a base having a reflective surface; and
a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section; and
wherein a height of each projection in the minute reflective structure is smaller in value than a thickness of the fluorescent layer.
14. A fluorescent substrate comprising:
a base having a reflective surface; and
a fluorescent layer formed by disposing a fluorescent substance on the reflective surface of the base;
wherein fluorescence emitted from the fluorescent substance due to its excitation by exciting light is emitted from a side of the base on which the fluorescent substance is disposed;
wherein the reflective surface of the base has a minute reflective structure formed thereon such that fluorescence emitted in a flat direction of the base from the fluorescent layer is emitted outward, in a direction intersecting the flat direction, from the side of the base on which the fluorescent substance is disposed;
wherein the minute reflective structure comprises a flat section and a plurality of projections projecting from the flat section;
wherein the base is a fluorescent wheel which is in the form of a disc, at a predetermined position on which a ring-like groove is formed, wherein the minute reflective structure is formed on a bottom face of the ring-like groove, and wherein the fluorescent layer is deposited within the ring-like groove; and
wherein each of the projections is a paraboloid of revolution.
15. The fluorescent substrate of claim 14, wherein a height of each projection in the minute reflective structure is equal in value to a thickness of the fluorescent layer.
16. The fluorescent substrate of claim 14, wherein a height of each projection in the minute reflective structure is smaller in value than a thickness of the fluorescent layer.
17. The fluorescent substrate of claim 14, wherein a red fluorescent layer that emits red wavelength band light, a green fluorescent layer that emits green wavelength band light, and a blue fluorescent layer that emits blue wavelength band light are disposed in order within the ring-like groove in a peripheral direction.
18. A light source device comprising an exciting light source and the fluorescent substrate of claim 14.
19. A light source device comprising:
an exciting light source;
the fluorescent substrate of claim 14; and
a wheel motor for rotating the fluorescent wheel which is the fluorescent substrate.
20. The fluorescent substrate of claim 14, wherein a red fluorescent layer that emits red wavelength band light, a green fluorescent layer that emits green wavelength band light, and a diffusion transmission layer that diffuses light and allows the light to pass therethrough are disposed in order within the ring-like groove of the base which is the fluorescent wheel in a peripheral direction.
21. A light source device comprising:
an exciting light source which is a blue laser beam generator whose optical axis is disposed so as to be perpendicular to the fluorescent substrate; and
the fluorescent substrate of claim 20;
wherein a dichroic mirror which allows emitted light from the exciting light source to pass therethrough and reflects fluorescence from the fluorescent substrate is disposed between the exciting light source and the fluorescent substrate.
22. A projector comprising:
a display element;
the light source device of claim 19;
a light source side optical system that guides light emitted from the light source device to the display element;
a projection side optical system that projects projection light from the display element to a screen; and
a projector controller.