Abstract: A voltage controlled oscillator controls an oscillation frequency based on a control voltage supplied from an external control voltage terminal. The voltage controlled oscillator includes a reference bias voltage circuit and a gain adjustment circuit. The reference bias voltage circuit includes multiple serial resistances between a reference voltage and a ground. The reference bias voltage circuit controls a switch coupled in parallel to at least one of the serial resistances and thus changes a voltage dividing ratio of the serial resistances so as to set a reference bias voltage. The gain adjustment circuit adjusts a gain of the control voltage. The gain adjustment circuit includes multiple resistances and multiple switching elements. The gain adjustment circuit controls the switching elements to form a voltage dividing circuit between the reference bias voltage and the external control voltage terminal so as to generate an automatic frequency control voltage.

Abstract: [Problem] In a SAW device using a SH-wave type surface acoustic wave, obtain a means to improve the Q factor. [Means to Solve the Problem] A surface acoustic wave (SAW) device includes a rotated Y-cut quartz crystal substrate where a cut angle “?” is set in ?64.0°<?<?49.3° with a crystalline Z-axis, an interdigital transducer (IDT) electrode formed on the quartz crystal substrate along a perpendicular direction to a crystalline Z-axis (a Z?-axis direction) of the quartz crystal substrate and grating reflectors disposed at both sides of the IDT, wherein a normalized electrode film thickness “H/?” which is a film thickness “H” of the IDT electrode normalized by an electrode period “?” of the IDT electrode is 0.04?H/??0.12, and a normalized crossing width “W/?” which is a crossing width “W” of the IDT electrode normalized by the electrode period “?” is set in the range of 20?W/??50.

Abstract: A flexural vibration piece includes: a base portion; and a vibration arm extending from the base portion, wherein the vibration arm has first and second main faces which are arranged to be opposite each other, the first and second main faces respectively have first and second grooves which are formed in the longitudinal direction of the vibration arm, the first groove has a plurality of first groove portions which are divided in the longitudinal direction of the vibration arm and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction, the second groove has a plurality of second groove portions which are divided in the longitudinal direction of the vibration arm, and arranged to be alternately shifted on both sides with respect to the longitudinal center line of the vibration arm in the longitudinal direction and on an opposite side to the first groove portions with respect to the longitudinal center line, and a predeterm

Abstract: A pressure sensor includes: a housing; a pressure input orifice opened at a pipe sleeve of the housing; a diaphragm sealing the pressure input orifice, the diaphragm having a first surface serving as a pressure receiving surface; a pressure sensitive unit using a direction of detecting a force as a detecting axis. A first end of the pressure sensitive unit is connected to a central area of a second surface of the diaphragm. A second end of the pressure sensitive unit is connected to the housing. The detecting axis is approximately orthogonal to the pressure receiving surface. A circumference of a portion where the central area and the first end of the pressure sensitive unit are in contact with each other is located inside a circumference of the central area. A thickness of the central area is larger than a thickness of an area surrounding the central area.

Abstract: A tuning fork resonator element that has a base portion, first and second resonating arms extending from the base portion in a first direction, and a support frame sandwiching the first and second resonating arms and being connected to the base portion includes: a first excitation electrode, formed in an area close to a connection portion with the base portion of the support frame, being connected to a mount electrode with a conductive adhesive; a second excitation electrode, formed in at least one of an area sandwiching the first and second resonating arms of the support frame and an area positioned farther than the first and second resonating arms in the first direction, being connected to a mount electrode with the conductive adhesive; and a cut portion of the support frame formed on an external surface of the support frame.

Abstract: A wavelength splitting element for splitting a multiplexed light beam in wavelength bands ?1, ?2 and ?3 into light beams in separate wavelength bands and emitting the split light beams from separate emission ports, includes: a first filter for splitting the multiplexed light beam in the wavelength bands ?1, ?2 and ?3 into a light beam in the wavelength band ?1 that the first filter passes in a first direction and into a light beam in the wavelength bands ?2 and ?3 that the first filter reflects; a second filter, which is provided in the direction of the light beam in the wavelength bands ?2 and ?3 that has been reflected by the first filter, for splitting the light beam in wavelength bands ?2 and ?3 that has been reflected by the first filter into a light beam in the wavelength band ?3 that the second filter passes in a second direction and into a light beam in the wavelength band ?2 that the second filter reflects; and a third filter, which is provided in the direction of the light beam that has been reflect

Abstract: A mobile navigation system gyro module comprises: first and second gyro sensors outputting angular velocities ?1, ?2 around first and second axes intersecting at an acute angle ?12; a sign determination circuit determining a sign of ?1; a correction circuit correcting the first and second gyro sensor outputs; and a computation circuit computing ??=?(?1?2+SA2) and SA=(?2???1? cos ?12)/sin ?12 using angular velocities ?1?, ?2? from the correction circuit, and outputting angular velocity ? by multiplying ?? by the sign of ?1, wherein the correction circuit includes: first and second offset adjustment circuits outputting ?1? and ?2? by respectively subtracting from ?1 and ?2, corrections B1 and B2 corresponding to the first and second gyro sensor outputs when the mobile unit stops; and the angular velocity ? is around an axis coplanar with and between the first and second axes.

Abstract: A gyro-module includes: a first gyro element component having a first detection axis and a second detection axis, and outputting at least a signal that is based on angular velocity around the first detection axis and the second detection axis; a second gyro element component having a first detection axis and a second detection axis, and outputting at least a signal that is based on angular velocity around the first detection axis and the second detection axis; a third gyro element component having a first detection axis; a first operation circuit conducting an operation of an output signal from the first gyro element component and an output signal from the third gyro element component; and a second operation circuit conducting an operation of an output signal from the second gyro element component and an output signal from the third gyro element component.

Abstract: A piezoelectric device includes: a piezoelectric resonator element; a package storing the piezoelectric resonator element therein in a manner to mount the piezoelectric resonator element on a base portion thereof composed of at least three layers that are layered; and a through hole penetrating through the base portion. In the device, the through hole includes a first hole formed on a first layer which is positioned to face the piezoelectric resonator element among the three layers; a second hole formed on a second layer contacting with the first layer; a third hole formed larger than the second hole on a third layer contacting with the second layer; and a metal coat formed on an inner wall surface of the second hole, and a sealing part for sealing the package is formed with a sealant in at least the second hole.

Abstract: A laminated wave plate includes a first wave plate with a phase difference of ?1=180° with respect to a designed wavelength ?0 and a second wave plate with a phase difference of ?2=180°, in which the first wave plate and the second wave plate are arranged and laminated so that optical axes thereof intersect each other, the laminated wave plate converting an incident linearly-polarized beam into a linearly-polarized beam obtained by rotating a polarization plane of the incident linearly-polarized beam by a predetermined angle ? and outputting the converted linearly-polarized beam. When in-plane bearing angles formed by the polarization plane of the incident linearly-polarized beam and optical axes of the first and second wave plates are represented by ?1 and ?2 and an optical axis adjustment amount is represented by a, the following expressions are satisfied: ?1=?/4+a; and ?2=3?/4?a.

Abstract: A laminated half-wave plate includes: first and second wave plates having optical axes intersecting each other, wherein when phase differences of the first and second wave plates with respect to a wavelength ? are represented by ?1 and ?2, in-plane bearing angles formed by a polarization plane of a linearly-polarized beam incident on the laminated half-wave plate and the optical axes of the first and second wave plates are represented by ?1 and ?2, an angle formed by the polarization directions of the linearly-polarized beams incident on and emitted from the laminated half-wave plate is represented by ?, and an optical axis adjustment amount is represented by a, the following expressions are satisfied: ?1=180°+n×360°; ?2=180°+n×360° (where n in ?1 and ?2 is a non-negative integer); ?1=?/4+a; and ?2=3?/4?a.

Abstract: A SAW resonator which, using a quartz crystal substrate with Euler angles (?1.5°???1.5°, 117°???142°, and 42.79°?|105|?49.57°, includes an IDT which excites a stop band upper end mode SAW, and grooves hollowed out of the substrate positioned between electrode fingers configuring the IDT, wherein, when the wavelength of the SAW is ? and the depth of the inter-electrode finger grooves is G, ? and G satisfy the relationship of 0.01??G and wherein, when the line occupation rate of the IDT is ?, the groove depth G and line occupation rate ? satisfy the relationships of ?2.0000×G/?+0.7200????2.5000×G/?+0.7775 provided that 0.0100??G?0.0500?, ?3.5898×G/?+0.7995????2.5000+G/?+0.7775 provided that 0.0500?<G?0.0695?.

Abstract: A flexural vibration piece includes: a flexural vibrator that has a first region on which a compressive stress or a tensile stress acts due to vibration and a second region having a relationship in which a tensile stress acts thereon when a compressive stress acts on the first region and a compressive stress acts thereon when a tensile stress acts on the first region, and performs flexural vibration in a first plane; and a heat conduction path, between the first region and the second region, that is formed of a material having a thermal conductivity higher than that of the flexural vibrator and thermally connects between the first region and the second region, wherein when m is the number of heat conduction paths, ?th is the thermal resistivity of the heat conduction path, ?v is the thermal resistivity of the flexural vibrator, tv is the thickness of the flexural vibrator in, a direction orthogonal to the first plane, and tth is the thickness of the heat conduction path, a relationship of tth?(1/m)×tv×(?th/?v

Abstract: An optical article includes a plurality of light transmissive members and a plurality of optical functional films, wherein the plurality of light transmissive members are disposed to face one another; the optical functional film is disposed such that the optical functional film is sandwiched between the light transmissive members; a bonding layer that bonds a surface of the optical functional film to a surface of the light transmissive member is provided; the optical functional film is a multilayer film in which a plurality of low refractive index layers and a plurality of high refractive index layers are alternately arranged and a layer in contact with the side of the bonding layer is a high refractive index layer; and the bonding layer is a plasma-polymerized film having the same refractive index as that of the low refractive index layer.

Abstract: A flexural vibration piece includes: a flexural vibrator that has a first region on which a compressive stress or a tensile stress acts due to vibration and a second region having a relationship in which a tensile stress acts thereon when a compressive stress acts on the first region and a compressive stress acts thereon when a tensile stress acts on the first region, and performs flexural vibration in a first plane; and a heat conduction path, in the vicinity of the first region and the second region, that is formed of a material having a thermal conductivity higher than that of the flexural vibrator and thermally connects between the first region and the second region, wherein when m is the number of heat conduction paths, ?th is the thermal conductivity of the heat conduction path, ?v is the thermal conductivity of the flexural vibrator, tv is the thickness of the flexural vibrator in a direction orthogonal to the first plane, and tth is the thickness of the heat conduction path, a relationship of tth?(tv/

Abstract: A pressure sensor includes: a housing having openings at both ends thereof; a pair of pressure-receiving devices configured to seal the openings respectively and transmit a pressure from the outside to the interior of the housing; a force transmission device configured to connect the pair of pressure-receiving devices and transmit a force that one of the pressure-receiving devices receives to the other pressure-receiving device; and a pressure-sensitive element having a pressure-sensitive portion and a pair of base portions to be connected to both ends of the pressure-sensitive portion, wherein a line connecting the pair of base portions and a detection axis, which is a direction of detection of the force, and the direction of displacement of the force transmission device are arranged in parallel; the one of the base portions is a first fixed portion, a pair of connecting devices extending from the other base portion so as to interpose the pressure-sensitive portion are connected respectively to a pair of sec

Abstract: A resonator element includes: a resonating body having a first region and a second region, the first region receiving a compression stress or an extension stress by a vibration, the second region receiving an extension stress responding to the compression stress in the first region, or a compression stress responding to the extension stress of the first region; and at least one film layer, on a surface of the resonating body between the first and the second regions, having thermal conductivity higher than thermal conductivity of the resonating body. In the element, the film layer includes a recessed section in which at least one film layer is removed between the first and the second regions.

Abstract: A surface acoustic wave resonator includes: an IDT which is disposed on a quartz crystal substrate with an Euler angle of (?1.5°???1.5°, 117°???142°, 41.9°?|?|?49.57°) and which excites a surface acoustic wave in an upper mode of a stop band; and an inter-electrode-finger groove formed by recessing the quartz crystal substrate between electrode fingers of the IDT, wherein the following expression: 0.01??G where ? represents a wavelength of the surface acoustic wave and G represents a depth of the inter-electrode-finger groove, is satisfied and when a line occupancy of the IDT is ?, the depth of the inter-electrode-finger groove G and the line occupancy ? are set to satisfy the following expression: ?2.5×G/?+0.675????2.5×G/?+0.775.

Abstract: A surface acoustic wave device comprises a surface acoustic wave element, including: a piezoelectric substrate, a first interdigital transducer unit having a first interdigital transducer and a second interdigital transducer formed on the piezoelectric substrate, and a second interdigital transducer unit having a third interdigital transducer and a fourth interdigital transducer formed on the piezoelectric substrate; a first terminal electrically coupled to the first interdigital transducer; a second terminal electrically coupled to the second interdigital transducer; a first variable resistor electrically coupling the first terminal to the third interdigital transducer; a second variable resistor electrically coupling the first terminal to the fourth interdigital transducer; a third variable resistor electrically coupling the second terminal to the third interdigital transducer; and a fourth variable resistor electrically coupling the second terminal to the fourth interdigital transducer.

Abstract: A pressure sensor element includes: a package, a first diaphragm provided on a first surface of the package, a second diaphragm provided on a second surface of the package, and a pressure sensing element disposed in the package, the pressure sensing element including: a first base formed at one end in a longitudinal direction of the pressure sensing element, a second base formed at the other end in the longitudinal direction, and a resonating portion formed between the first base and the second base. In the element, the first and second surfaces are opposed to each other. The pressure sensor element is disposed such that the longitudinal direction is orthogonal to a displacement direction of each of the first and second diaphragms. The first base is connected to the first diaphragm while the second base is connected to the second diaphragm.