Time filter

Source Type

A quartz crystal resonator element includes an AT-cut quartz crystal substrate, the substrate having edges parallel to each of a Z axis obtained by rotating a Z axis in a range of 120 to +60 about a Y axis and an X axis perpendicular to the Z axis when an angle formed by rotating a +Z axis in a direction of a +X axis about the Y axis is a positive rotation angle; a thin section that forms a resonating section; and a thick section adjacent to the resonating section, the thin section and the thick section being formed on the quartz crystal substrate by wet etching. The thin section is formed either on a main surface of the substrate corresponding to a +Y-axis side or on a main surface of the substrate corresponding to a Y-axis side. When the thin section is formed by the etching on the main surface of the +Y-axis side, the thick section is provided at least a +Z-axis-side end of the thin section, whereas when the thin section is formed by the etching on the main surface of the Y-axis side, the thick section is provided at least a Z-axis-side end of the thin section.


Patent
Seiko Epson Corporation and Epson Toyocom Corporation | Date: 2011-07-29

A flexural resonator element includes a base body and a beam with a groove and a through-hole, the beam being extended in a Y direction from the base body and flexurally vibrating in an X direction orthogonal to the Y direction, the groove being formed on a surfaces of the beam perpendicular to a Z direction orthogonal to the X direction and the Y direction, and the through-hole having a smaller width in the X direction than a width of an opening of the groove in the X direction and penetrating from an inner surface of the groove formed on the surface of the beam to a surface of the beam opposite to the surface of the beam having the groove.


Patent
Epson Toyocom Corporation | Date: 2011-04-27

A method for manufacturing an acceleration sensing unit includes: providing an element support substrate in which a plurality of element supporting members is arranged so as to form a plane, each of the element supporting members being coupled to the other element supporting member through a supporting part and having a fixed part and a movable part that is supported by the fixed part through a beam, the beam having a flexibility with which the movable part is displaced along an acceleration detection axis direction when an acceleration is applied to the movable part; providing an stress sensing element substrate in which a plurality of stress sensing elements is arranged so as to form a plane, each of the stress sensing elements being coupled to the other stress sensing element through an element supporting part and having a stress sensing part and fixed ends that are formed so as to have a single body with the stress sensing part at both ends of the stress sensing part; disposing the stress sensing element substrate on the element support substrate such that the fixed ends of each stress sensing element are situated on the fixed part and the movable part; fixing the fixed ends onto the fixed part and the movable part, and dividing the element supporting part and the supporting part.


Patent
Epson Toyocom Corporation | Date: 2011-01-04

An inertial sensor, comprises a detection element detecting an amount of a physical quantity in a detection axis direction, a plurality of support members having flexibility and supporting nearly a center of the detection element, and a package substrate housing the detection element and the plurality of support members. In a case when an X-axis is defined as an extending direction of the plurality of support members, a Y-axis is perpendicular to the X-axis in a plane including the detection element, and a Z-axis is perpendicular to the X-axis and the Y-axis, one of load components in a direction of the Y-axis of the detection member applied to the plurality of support members is nearly equal to other among the plurality of support members, and one of load components in a direction of the Z-axis is nearly equal to the other among the plurality of support members.


Patent
Epson Toyocom Corporation | Date: 2011-06-14

[Problems to be Solved] To obtain a laminated quarter-wave plate having a bandwidth of a plurality of wavelengths to be a phase difference of 90 degrees broadened [Means to Solve the Problem] A laminated wave plate of the present invention includes a first wave plate having a phase difference of 1 and a second wave plate having a phase difference of 2 with respect to a wavelength , the first wave plate and the second wave plate being bonded together so that an optical axis of the first wave plate and an optical axis of the second wave plate are intersected each other to function as a quarter-wave plate as a whole, the laminated wave plate comprising following equations from (1) to (6): 1=360(n1+1) . . . (1); 2=90(2n2+1) . . . (2); 1=(12a11a)/(1211) . . . (3); 2=(12b11b)/(1211) . . . (4); cos 21=1(1cos F)/2(1cos 1) . . . (5); and 2=455 . . . (6), wherein 1 is an optic axis orientation of the first wave plate, 2 is an optic axis orientation of the second wave plate, and each of 1112, n1, and n2 is a natural number starting from 1.


Patent
Epson Toyocom Corporation | Date: 2011-07-07

A physical section of an atomic oscillator includes: a gas cell in which gaseous metal atoms are sealed, and the gas cell includes a first window having optical transparency; a light source that emits excitation light toward the metal atoms through the first window; a first heating unit that disposes at the first window and that is located between the first window and the light source; and a Peltier element that is stacked on the first heating unit, that is located between the first heating unit and the light source, and that decreases a temperature of a side of the Peltier element facing the light source than a temperature of an opposite side of the Peltier element facing the gas cell.


Patent
Epson Toyocom Corporation | Date: 2011-07-01

A surface acoustic wave device, includes: an interdigital transducer serving as an electrode pattern to excite a Rayleigh surface acoustic wave, the interdigital transducer including a comb-tooth-shaped electrode having a plurality of electrode fingers; a piezoelectric substrate on which the interdigital transducer is formed, the piezoelectric substrate being made of a quartz substrate that is cut out at a cut angle represented by an Euler angle representation (, , ) of (0, 95155, 33||46); electrode finger grooves formed between the electrode fingers of the comb-tooth-shaped electrode; and electrode finger bases being quartz portions sandwiched between the electrode finger grooves and having upper surfaces on which the electrode fingers are positioned. The surface acoustic wave device provides an excitation in an upper limit mode of a stop band of the surface acoustic wave.


First and a second wave plates using quartz crystal having birefringence are laminated together in such a manner that their optical axes intersect to form a laminated wave plate functioning as a half-wave plate as a whole. Phase differences of the first and the second wave plates relative to an ordinary ray and an extraordinary ray with respect to a predetermined wavelength are set to be 1 and 2, an order of a high-mode order is set to be a natural number n, whereby the high-order mode laminated half-wave plate is formed so as to satisfy: 1=180+360n; and 2=180+360n.


Patent
Epson Toyocom Corporation | Date: 2011-03-18

An electronic device includes: an outline configuration including a first surface, a second surface facing opposite from the first surface, and a mounting surface coupled to the first and second surfaces; a first substrate including a first electrode; a second substrate including a second electrode; a resin disposed between the first and second substrates; and an electric element sealed with the resin and having an outline configuration of a polyhedron, the electric element being disposed such that a broadest surface of the polyhedron faces one of the first substrate and the second substrate. The first surface is one surface of the first substrate, the one surface being opposite from another surface of the first substrate on a side adjacent to the resin. The second surface is one surface of the second substrate, the one surface being opposite from another surface of the second substrate on a side adjacent to the resin. The mounting surface includes: an exposed surface of the resin between the first and second substrates, and side surfaces of the first and second substrates adjacent to the exposed surface. The first electrode is disposed at an end of the first surface adjacent to the mounting surface and electrically coupled to the electric element. The second electrode is disposed at an end of the second surface adjacent to the mounting surface.


It is possible to reduce the size of a surface acoustic wave resonator by enhancing a Q value. In a surface acoustic wave resonator 1 in which an IDT, 12 having electrode fingers 12a and 12b for exciting surface acoustic waves is formed on a crystal substrate 11, the line occupying ratio causing the maximum electromechanical coupling coefficient and the line occupying ratio causing the maximum reflection of the surface acoustic waves in the IDT 12 are different from each other, the center of the IDT 12 has the line occupying ratio causing an increase in electromechanical coupling coefficient in comparison with the edges of the IDT 12, and the edges of the IDT 12 have the line occupying ratio causing an increase in reflection of the surface acoustic waves in comparison with the center of the IDT 12.

Loading Epson Toyocom Corporation collaborators
Loading Epson Toyocom Corporation collaborators