摘要:
An acoustic wave device of the present application includes a piezoelectric substrate (14), interdigital transducer electrodes (13) formed on the piezoelectric substrate (14), and an SiO2 film (12) formed so as to cover the electrodes (13). The acoustic wave device also includes a displacement adjustment film (11) formed on the SiO2 film (12), and the displacement adjustment film (11) is formed from a substance whose acoustic velocity is slower than that of the substance forming the SiO2 film (12). According to this configuration, it is possible to suppress unnecessary waves as well as improve temperature characteristics. Also, by mounting such an acoustic wave device in a communication module or communication apparatus, it is possible to achieve an improvement in reliability.
摘要:
An acoustic wave element includes: resonators 2 each including an electrode to excite acoustic waves; a power supply wiring portion 3 that is disposed so as to connect the resonators 2 electrically; a piezoelectric substrate 4 on which the resonators 2 and the power supply wiring portion 3 are formed; a second medium 5 that is formed on the piezoelectric substrate 4 so as to cover the resonators 2; and a third medium 6 that is formed on the piezoelectric substrate 4 so as to cover at least the second medium 5 and the power supply wiring portion 3. A side surface 34 of the power supply wiring portion 3 that is in contact with a surface of the piezoelectric substrate 4 forms an obtuse first angle θ with respect to the surface 4a of the piezoelectric substrate 4.
摘要:
An elastic wave device is described which includes a piezoelectric substrate, comb-shaped electrodes having teeth electrodes that are disposed so as to face each other on the piezoelectric substrate, a non-overlapping area in which the teeth electrodes of the comb-shaped electrodes do not overlap each other, and a overlapping area in which the teeth electrodes overlap each other and the velocity of sound is higher than that in the non-overlapping area.
摘要:
An acoustic wave device includes a piezoelectric substrate, interdigital electrodes arranged on the piezoelectric substrate, a first dielectric element arranged between the interdigital electrodes, a second dielectric element that covers the interdigital electrodes and the first dielectric element, and an adjustment element that has been formed on the first dielectric element. The adjustment element has been formed from a material whose specific gravity is greater than that of the first dielectric element and that of the second dielectric element.
摘要:
An elastic wave device including a piezoelectric substrate, comb-like electrodes formed on the piezoelectric substrate, and a dielectric layer formed on the piezoelectric substrate. The dielectric layer formed on the piezoelectric substrate covers the comb-like electrodes and the thickness of the dielectric layer formed on the piezoelectric substrate is larger than the sum of the thickness of the comb-like electrodes and the thickness of the dielectric layer formed on the comb-like electrodes.
摘要:
An angular velocity sensor is provided that includes a frame, an oscillator and torsion bars that connect the oscillator to the frame. The frame, the oscillator and the torsion bar are formed integral with each other by etching a material substrate in the thickness direction of the substrate. The oscillator, configured in the form of an H, includes a support, two first arms and two second arms. These arms extend from the support in an arm-extending direction perpendicular to the thickness direction of the substrate. The oscillator includes a mounting surface that is provided with a piezoelectric driver for generating in-plane oscillation of the oscillator, and with a piezoelectric detector for detecting out-of-plane oscillation of the oscillator.
摘要:
The present invention relates to a method of manufacturing a semiconductor device for forming an insulated gate field effect transistor in a completely isolated SOI layer, and has for its object to prevent depletion or inversion surely by introducing impurities of sufficiently high concentration into an SOI layer adjacent to an isolating film filled up between element regions of the SOI layer and a backing insulating layer and to aim at flattening of the SOI substrate surface, and further, includes the steps of implanting impurity ions into a semiconductor layer from an oblique direction so as to reach the semiconductor layer under an oxidation-preventive mask using the oxidation-preventive mask as a mask for ion implantation, heating the semiconductor layer in an oxidizing atmosphere with the oxidation-preventive mask so as to form a local oxide film to isolate the semiconductor layer, and also forming a impurity region with impurities implanted into the semiconductor layer in a region adjacent to the local oxide film and to at least an insulating layer under the semiconductor layer.
摘要:
The present invention relates to a method of manufacturing a semiconductor device for forming an insulated gate field effect transistor in a completely isolated SOI layer, and has for its object to prevent depletion or inversion surely by introducing impurities of sufficiently high concentration into an SOI layer adjacent to an isolating film filled up between element regions of the SOI layer and a backing insulating layer and to aim at flattening of the SOI substrate surface, and further, includes the steps of implanting impurity ions into a semiconductor layer from an oblique direction so as to reach the semiconductor layer under an oxidation-preventive mask using the oxidation-preventive mask as a mask for ion implantation, heating the semiconductor layer in an oxidizing atmosphere with the oxidation-preventive mask so as to form a local oxide film to isolate the semiconductor layer, and also forming a impurity region with impurities implanted into the semiconductor layer in a region adjacent to the local oxide film and to at least an insulating layer under the semiconductor layer.