1. A mounting structure for boosters to mount a booster provided with a casing formed by hermetically connecting a front cell and a rear cell, comprising:
a front bolt passing through the front cell, the inside of the front bolt being hollow;
a tube having a cylindrical shape, the inside of which is hollow in the lengthwise direction, and provided with a front part connected to the rear portion of the front bolt to surround the outer circumferential surface of the rear portion of the front bolt and a rear part crossing the casing to pass through the rear cell; and
a sealing member provided between the tube and the front bolt.
2. The mounting structure for boosters according to claim 1, wherein the front bolt includes a first connection part protruding to the outside of the front cell, a second connection part protruding to the inside of the front cell, and an extension part integrally formed between the first connection part and the second connection part and expanding in the radial direction to be caulked to the front cell.
3. The mounting structure for boosters according to claim 1, wherein a groove line into which the sealing member is inserted is formed on the outer circumferential surface of the second connection part.
4. The mounting structure for boosters according to claim 1, wherein the tube is provided with an expansion part expanding so as to have a larger inner diameter than that of the tube, and the expansion part is connected to the second connection part so as to surround the second connection part.
5. A booster assembly for vehicles comprising:
a booster provided within an engine room divided from a driver’s seat by a dashboard;
a master cylinder located at the outside of the front portion of the booster and converting force generated from the booster into hydraulic pressure;
a pedal bracket connected to the dashboard at the side of the driver’s seat and provided with a fixing nut formed integrally with the pedal bracket;
a through bolt passing through the master cylinder and the booster from the engine room and fastened to the fixing nut of the pedal bracket; and
a mounting structure for boosters crossing the booster such that the through bolt is inserted into the mounting structure for boosters, according to any one of claims 1 to 4.
6. The booster assembly for vehicles according to claim 5, wherein a flange part through which the front bolt provided on the mounting structure for boosters passes is formed on the master cylinder,
further comprising a nut screw-connected to the front bolt passing through the flange part to fix the master cylinder to the booster.
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. An acoustic wave element comprising:
a piezoelectric body having an upper surface;
a first interdigital transducer (IDT) electrode provided on the upper surface of the piezoelectric body;
a second IDT electrode provided on the upper surface of the piezoelectric body and having a thickness larger than a thickness of the first IDT electrode; and
a first dielectric layer provided on the upper surface of the piezoelectric body to cover the first IDT electrode and the second IDT electrode,
wherein the first dielectric layer has a first part directly above the first IDT electrode and a second part directly above the second IDT electrode, and
wherein a height of an upper surface of the second part of the first dielectric layer is larger than a height of an upper surface of the first part of the first dielectric layer.
2. The acoustic wave element according to claim 1,
wherein a thickness of the second part of the first dielectric layer is not smaller than a thickness of the first part of the first dielectric layer, and
wherein a normalized thickness of the second part of the first dielectric layer is not larger than a normalized thickness of the first part of the first dielectric layer.
3. The acoustic wave element according to claim 1,
wherein an upper surface of the first dielectric layer has:
a first projection positioned directly above the first IDT electrode and extending along the first IDT electrode; and
a second projection positioned directly above the second IDT electrode and extending along the second IDT electrode, and
wherein a height of the second projection is larger than a height of the first projection.
4. The acoustic wave element according to claim 3,
wherein the first IDT electrode has a first electrode finger, and
wherein a width of a top of the first projection is not larger than \xbd of a width of the first electrode finger.
5. The acoustic wave element according to claim 4, wherein a center of the top of the first projection is positioned substantially directly above a center of the first electrode finger.
6. The acoustic wave element according to claim 4,
wherein the second IDT electrode has a second electrode finger, and
wherein a width of a top of the second projection is not larger than \xbd of a width of the second electrode finger.
7. The acoustic wave element according to claim 6, wherein a center of the top of the second projection is positioned substantially directly above a center of the second electrode finger.
8. The acoustic wave element according to claim 3, wherein height TG of the first projection, thickness TA of the first IDT electrode, and wavelength \u03bb1 of an acoustic wave propagating through the first IDT electrode satisfy a relation: 0.03\xd7\u03bb1<TG\u2266TA.
9. The acoustic wave element according to claim 8, wherein height TH of the second projection, thickness TB of the second IDT electrode, and wavelength \u03bb2 of an acoustic wave propagating through the second IDT electrode satisfy a relation: 0.03\xd7\u03bb2<TH\u2266TB.
10. The acoustic wave element according to claim 1, further comprising:
a second dielectric layer provided on an upper surface of the first dielectric layer, and allows a transverse wave to transmit faster than a transverse wave transmitting through the first dielectric layer;
a first external terminal provided on an upper surface of the second dielectric layer and electrically connected to the first IDT electrode; and
a second external terminal provided on an upper surface of the second dielectric layer and electrically connected to the second IDT electrode,
wherein a difference between a height of the upper surface of the second dielectric layer above the first IDT electrode and a height of the upper surface of the second dielectric layer above the second IDT electrode is smaller than a difference between a height of the upper surface of the first dielectric layer above the first IDT electrode and a height of the upper surface of the first dielectric layer above the second IDT electrode.
11. The acoustic wave element according to claim 1,
wherein the first IDT electrode constitutes a first filter passing a signal in a first frequency band, and
wherein the second IDT electrode constitutes a second filter passing a signal in a second frequency band lower than the first frequency band.
12. The acoustic wave element according to claim 1,
wherein the first IDT electrode forms a series resonator having a first resonance frequency;
wherein the second IDT electrode forms a parallel resonator having a second resonance frequency lower than the first resonance frequency, and
wherein the series resonator and the parallel resonator constitute a ladder-type filter.
13. An electronic apparatus comprising:
the acoustic wave element according to claim 1; and
an electronic component connected to the acoustic wave element.