Abstract: The coil component includes a coil, a first core having a first magnetic permeability, and a second core having a second magnetic permeability lower than the first magnetic permeability. The first core and the second core form a magnetic path. The coil forms two or more winding windows. The first core contacts with an entirety of one side line extending in a second direction of each of the winding windows, and protrudes from both ends of one side line of at least one of the winding windows. The second core contacts with three side lines other than the one side line of each of the winding windows. A surface resistance of the first core between two points that are 20 mm away from each other is not less than 5 ? after a high-temperature storage test. A drive frequency of the coil component is not less than 20 kHz.

Abstract: Provided is a semiconductor device and a method of manufacturing a semiconductor device in which deterioration of energy loss is suppressed. The semiconductor device includes: a drift layer of a first conductivity type provided between a first main surface and a second main surface of a semiconductor substrate; and a field stop layer of the first conductivity type having an impurity concentration higher than that of the drift layer and provided between the drift layer and the second main surface. A net carrier concentration profile at room temperature of the field stop layer have at least one peak from the second main surface toward the first main surface. A hydrogen atom concentration profile of the field stop layer have at least two peaks from the second main surface toward the first main surface. The hydrogen atom concentration profile has more peaks than the net carrier concentration profile.

Abstract: A first regrowth layer and a second regrowth layer comprising GaAs having high resistance are regrown on a surface of an etching stop layer exposed to the bottom of a first groove and a second groove, and then n-type InGaAs is regrown on the first regrowth layer and the second regrowth layer, whereby a source region and a drain region configured to make contact with a channel layer are formed in the first groove and the second groove respectively.

Abstract: A piezoelectric vibrator manufacturing method includes a cavity forming step for forming depressions for a cavities on at least one of two wafers; a bonding electrode film forming step for forming bonding electrode films on bonded surfaces of the both wafers; a mount pattern forming step for forming a pair of mount patterns in the cavity; a through hole forming step for forming a pair of through holes in the cavity; a through electrode forming step for forming a pair of through electrodes electrically connected with the pattern in the cavity; a mount step for electrically connecting the pattern and a piezoelectric vibrating strip, a superimposing step for superimposing the both wafers and storing getter materials; a bonding step for anodically bonding the both wafers to fabricating a wafer member; a gettering step for adjusting the degree of vacuum in the interior of the cavity while measuring a series resonance resistance value; and a cutting step for cutting the wafer member into individual pieces.

Abstract: A piezoelectric vibrator manufacturing method includes a cavity forming step for forming depressions for a cavities on at least one of two wafers; a bonding electrode film forming step for forming bonding electrode films on bonded surfaces of the both wafers; a mount pattern forming step for forming a pair of mount patterns in the cavity; a through hole forming step for forming a pair of through holes in the cavity; a through electrode forming step for forming a pair of through electrodes electrically connected with the pattern in the cavity; a mount step for electrically connecting the pattern and a piezoelectric vibrating strip, a superimposing step for superimposing the both wafers and storing getter materials; a bonding step for anodically bonding the both wafers to fabricating a wafer member; a gettering step for adjusting the degree of vacuum in the interior of the cavity while measuring a series resonance resistance value; and a cutting step for cutting the wafer member into individual pieces.

Abstract: A recoil starter includes a base plate that has a bearing portion formed therein and a rotary shaft that is supported by the bearing portion so as to pass through the base plate. A rope reel is rotatably supported at one side of the base plate, and a recoil rope is wound around the rope reel. A recoil spiral spring urges the rope reel to rewind the recoil rope. A damper spring has one end connected to the rotary shaft and the other end connected to the rope reel, and a clutch mechanism is disposed on an end of the rotary shaft at the other side of the base plate. The clutch mechanism transfers a rotational force to an engine.

Abstract: To provide an airtight terminal and a piezoelectric vibrator having a strong rigidity of a lead despite a small-sized constitution, and provide a method of fabricating an airtight terminal constituting a lead penetrating inside of a stem by one piece and a piezoelectric vibrator with an excellent yield. A stem 11 filled with a filling member 13 is penetrated only with one piece of a lead 12 formed from a lead frame. As an electric terminal, a conductive lead 16 connected to the stem 11 is provided other than the lead 12. The lead 12 and the conductive lead 16 of an airtight terminal 10 constituted by the stem 11, the lead 12, the filling member 13, the conductive lead 16 are connected to a piezoelectric vibrating piece 20, further, the stem 11 is capped to a case 30 to thereby constitute a piezoelectric vibrator 1.

Abstract: A method is provided for producing a piezoelectric vibrator having an airtight terminal comprised of an annular stem, a lead disposed to pass through the stem and formed of a conductive material, and a filler for fixing the lead in the stem, and the piezoelectric vibrator having a vibrating piece connected to the lead of the airtight terminal and a case bonded to the airtight terminal to cover the vibrating piece. The method comprises an airtight terminal production process that produces the airtight terminal on a lead frame, and a piezoelectric vibrator assembly process that assembles the piezoelectric vibrator using the produced airtight terminal and on the same lead frame on which the airtight terminal is produced.

Abstract: To provide an airtight terminal and a piezoelectric vibrator having a strong rigidity of a lead despite a small-sized constitution, and provide a method of fabricating an airtight terminal constituting a lead penetrating inside of a stem by one piece and a piezoelectric vibrator with an excellent yield. A stem 11 filled with a filling member 13 is penetrated only with one piece of a lead 12 formed from a lead frame. As an electric terminal, a conductive lead 16 connected to the stem 11 is provided other than the lead 12. The lead 12 and the conductive lead 16 of an airtight terminal 10 constituted by the stem 11, the lead 12, the filling member 13, the conductive lead 16 are connected to a piezoelectric vibrating piece 20, further, the stem 11 is capped to a case 30 to thereby constitute a piezoelectric vibrator 1.

Abstract: According to an aspect of the present invention, there is provided a recoil starter including: a base plate that has a bearing portion formed therein; a rotary shaft that is supported by the bearing portion so as to pass through the base plate; a rope reel that is rotatably supported at one side of the base plate; a recoil rope that is wound around the rope reel; a recoil spiral spring that urges the rope reel to rewind the recoil rope; a damper spring that has one end connected to the rotary shaft and the other end connected to the rope reel; and a clutch mechanism that is disposed on an end of the rotary shaft at the other side of the base plate and that transfer a rotational force to an engine.

Abstract: To provide an airtight terminal and a piezoelectric vibrator having a strong rigidity of a lead despite a small-sized constitution, and provide a method of fabricating an airtight terminal constituting a lead penetrating inside of a stem by one piece and a piezoelectric vibrator with an excellent yield. A stem 11 filled with a filling member 13 is penetrated only with one piece of a lead 12 formed from a lead frame. As an electric terminal, a conductive lead 16 connected to the stem 11 is provided other than the lead 12. The lead 12 and the conductive lead 16 of an airtight terminal 10 constituted by the stem 11, the lead 12, the filling member 13, the conductive lead 16 are connected to a piezoelectric vibrating piece 20, further, the stem 11 is capped to a case 30 to thereby constitute a piezoelectric vibrator 1.

Abstract: A method for producing an airtight terminal having an annular stem, a lead passing through the stem and formed of a conductive material, and a filler for fixing the lead in the stem includes (1) a lead contour formation step of disposing a base and a lead formation portion on a plate- or strip-shaped conductive material and forming a contour of the lead on the lead formation portion with at least one end of the lead connected to the base, (2) a filler shaping and sintering step of filling the lead having a contour with the filler in a predetermined position and shaping and sintering the filler, (3) a stem mounting step of mounting the stem to a perimeter of the sintered filler, (4) a firing step of heating, melting, and cooling the sintered filler in the stem and bringing the lead into close contact with the stem to fix the lead to the stem through the filler, (5) a metal film formation step of forming a metal film on a surface of the lead, and (6) a cutting step of separating the one end of the lead from the

Abstract: To propose a structure of a small-sized airtight terminal capable of restraining a reduction in yield of steps of fabricating an airtight terminal and steps of integrating a piezoelectric vibrator and a mold structure of a surface mount type piezoelectric vibrator in correspondence with the airtight terminal, there is provided a surface mount type piezoelectric vibrator including a piezoelectric vibrating piece having a pair of exciting electrodes, a first electrode of the pair of exciting electrodes being electrically connected to the lead, and a second electrode thereof being electrically connected to a stem of an airtight terminal, a case of a bottomed cylinder type fixed to the stem to cover the piezoelectric vibrating piece to form an airtight space, a first external electrode terminal electrically conductive to the first electrode by way of the lead, a second external electrode terminal electrically conductive to the second electrode, and a mold resin molded to be formed on surfaces of the case and the

Abstract: To provide an airtight terminal and a piezoelectric vibrator having a strong rigidity of a lead despite a small-sized constitution, and provide a method of fabricating an airtight terminal constituting a lead penetrating inside of a stem by one piece and a piezoelectric vibrator with an excellent yield. A stem 11 filled with a filling member 13 is penetrated only with one piece of a lead 12 formed from a lead frame. As an electric terminal, a conductive lead 16 connected to the stem 11 is provided other than the lead 12. The lead 12 and the conductive lead 16 of an airtight terminal 10 constituted by the stem 11, the lead 12, the filling member 13, the conductive lead 16 are connected to a piezoelectric vibrating piece 20, further, the stem 11 is capped to a case 30 to thereby constitute a piezoelectric vibrator 1.

Abstract: To propose a structure of a small-sized airtight terminal capable of restraining a reduction in yield of steps of fabricating an airtight terminal and steps of integrating a piezoelectric vibrator and a mold structure of a surface mount type piezoelectric vibrator in correspondence with the airtight terminal, there is provided a surface mount type piezoelectric vibrator including a piezoelectric vibrating piece having a pair of exciting electrodes, a first electrode of the pair of exciting electrodes being electrically connected to the lead, and a second electrode thereof being electrically connected to a stem of an airtight terminal, a case of a bottomed cylinder type fixed to the stem to cover the piezoelectric vibrating piece to form an airtight space, a first external electrode terminal electrically conductive to the first electrode by way of the lead, a second external electrode terminal electrically conductive to the second electrode, and a mold resin molded to be formed on surfaces of the case and the

Abstract: A piezoelectric vibrator production method is disclosed, which can cope with a reduction in piezoelectric vibrator size and improve assembly accuracy and quality. The method of producing a piezoelectric vibrator having an airtight terminal composed of an annular stem, a lead disposed to pass through the stem and formed of a conductive material, and a filler for fixing the lead in the stem, a vibrating piece connected to the lead, and a case bonded to the airtight terminal to cover the vibrating piece, the method comprising an airtight terminal production process for producing the airtight terminal, and a piezoelectric vibrator assembly process for assembling the piezoelectric vibrator using the airtight terminal, wherein in the airtight terminal production process and the piezoelectric vibrator assembly process, the airtight terminal is arranged and held on a same lead frame and is caused to flow consistently.

Abstract: An airtight terminal that is small but provides good yield and a method for producing the same, an airtight terminal best suited for use in a piezoelectric vibrator and a method for producing the same, and a small piezoelectric vibrator with a small change in properties that uses these airtight terminals are to be provided.