Abstract: An object is to provide a technique enabling conversion efficiency to be increased irrespective of an operating ambient temperature. A DC-DC converter includes switching elements, a drive unit which drives the switching elements to conduct synchronous rectification, a freewheel diode connected in parallel to the switching element, and a temperature detection circuit which detects a temperature of the freewheel diode. The drive unit stops driving the switching element when the temperature detected by the temperature detection circuit is equal to or lower than a predetermined first threshold value.

Abstract: A semiconductor device of the present invention includes a transistor having a drain and a source, a voltage being applied between the drain and the source from a high-voltage power supply, a drive device that generates a source voltage and a gate voltage for the transistor from a voltage of a low-voltage power supply lower than that of the high-voltage power supply, and a voltage dividing circuit connected to the low-voltage power supply, wherein when the source voltage is lower than a certain value, an output voltage from the voltage dividing circuit is applied to the source.

Abstract: An object is to provide a technique enabling conversion efficiency to be increased irrespective of an operating ambient temperature. A DC-DC converter includes switching elements, a drive unit which drives the switching elements to conduct synchronous rectification, a freewheel diode connected in parallel to the switching element, and a temperature detection circuit which detects a temperature of the freewheel diode. The drive unit stops driving the switching element when the temperature detected by the temperature detection circuit is equal to or lower than a predetermined first threshold value.

Abstract: A voltage detecting circuit of the present invention is formed of a differential amplifier and an H-detection filter circuit, and the differential amplifier amplifies a potential difference between an input voltage and a primary-side voltage to obtain a differential amplified voltage. The H-detection filter circuit extracts low frequency components of the differential amplified voltage to output a detection voltage. A DC/DC control IC outputs, to a control electrode of a transistor, a PWM signal obtained by shaping a pulse width based on the detection voltage, to thereby control an on/off operation of the transistor.

Abstract: A semiconductor device of the present invention includes a transistor having a drain and a source, a voltage being applied between the drain and the source from a high-voltage power supply, a drive device that generates a source voltage and a gate voltage for the transistor from a voltage of a low-voltage power supply lower than that of the high-voltage power supply, and a voltage dividing circuit connected to the low-voltage power supply, wherein when the source voltage is lower than a certain value, an output voltage from the voltage dividing circuit is applied to the source.

Abstract: A voltage detecting circuit of the present invention is formed of a differential amplifier and an H-detection filter circuit, and the differential amplifier amplifies a potential difference between an input voltage and a primary-side voltage to obtain a differential amplified voltage. The H-detection filter circuit extracts low frequency components of the differential amplified voltage to output a detection voltage. A DC/DC control IC outputs, to a control electrode of a transistor, a PWM signal obtained by shaping a pulse width based on the detection voltage, to thereby control an on/off operation of the transistor.

Abstract: A gate circuit includes a gate resistive element connected at one end to the gate of a power device, an on-switching device connected between a power supply and the other end of the gate resistive element, a first resistive element whose connection to the gate is controlled by a first switching device, a second resistive element whose connection to the gate is controlled by a second switching device, and having a higher resistance value than the first resistive element, excessive current suppression means for turning on the first switching device just when the current in the power device reaches a predetermined value, and turn-off delay means for, after the excessive current suppression means turns on the first switching device, turning off the on-switching device and the first switching device and turning on the second switching device to turn off the power device.

Abstract: A gate circuit includes a gate resistive element connected at one end to the gate of a power device, an on-switching device connected between a power supply and the other end of the gate resistive element, a first resistive element whose connection to the gate is controlled by a first switching device, a second resistive element whose connection to the gate is controlled by a second switching device, and having a higher resistance value than the first resistive element, excessive current suppression means for turning on the first switching device just when the current in the power device reaches a predetermined value, and turn-off delay means for, after the excessive current suppression means turns on the first switching device, turning off the on-switching device and the first switching device and turning on the second switching device to turn off the power device.

Abstract: In a method for delivering a nucleic acid of the invention, a nucleic acid is introduced into a cell by pressing the nucleic acid supported on a surface of a solid substrate against the cell. According to the method, the nucleic acid can be delivered into the cell simply at a low cost without placing a heavy burden on the cell at a high nucleic acid delivery efficiency. By allowing the surface of the solid substrate to support the nucleic acid in the form of a complex with a polyamine or a cationic lipid and pressing it against the cell, the introduction efficiency into the cell can be further improved. In the invention, by using a nucleic acid useful for gene therapy as the nucleic acid, a high-efficiency device for gene therapy can be obtained.

Abstract: A partial curved on-vehicle rear view mirror, wherein a center main portion (1) is formed in a flat surface, but an outer portion (2) is formed in a gentle convex surface toward the outside, a lower portion (4) is also formed in a gentle convex surface toward the lower side, and an inner portion (3) is also formed in a convex surface toward the inside so that the view of the mirror can be safely and efficiently increased in each direction. Since the center main portion (1) is formed in the flat surface, the safety of the operations of automobiles, motorcycles, and so on can be sufficiently increased by sufficiently expanding the rear view to the sides and also expanding the view in the lower side while sufficiently securing visual stability.

Abstract: A thread winder unit, which is capable of winding thread of spools set on spool bars, is removably attached to a machine body. The sewing machine includes a feed motor for feeding the thread during sewing, an upper thread state detecting sensor disposed between the feed motor and the thread winder unit for detecting tensed thread, and a CPU for controlling thread winding operations based on a signal from the upper thread state detecting sensor. The sewing machine intermittently drives the feed motor in a reverse direction to that in the sewing to feed the thread toward the thread winder unit, every time the upper thread state detecting sensor detects the tensed thread, and the thread winder unit winds the fed thread around the spool. The CPU, recognizing the thread wound by a given amount, stops winding.

Abstract: There are provided an upper shaft clutch mechanism 140, a bobbin 22 including a slit 39, a horizontal holder 4 including an inner holder 18 and a blade tip 42, a bobbin driving member 11, bobbin driving member moving means 94 for moving the bobbin driving member 11 to freely advance or retreat between two positions having a separating position and a connecting position, a thread holding and catching member 48 including an upper thread holding portion 59, an upper thread engaging portion 60 and a thread position regulating portion 58 which are always set in a retreat position and are set in an entry position during a thread winding operation, thread holding and catching member moving means 53 for moving the thread holding and catching member 48 to freely advance or retreat between two positions having a retreat position and an entry position, and a thread winding operation control portion 193 for controlling the operation of each portion during the thread winding operation.

Abstract: In an embroidery sewing machine having a lower thread winding device, when the non-lower thread state of the bobbin is detected by a residual amount sensor, a sewing machine motor is stopped to detect and recognize the size of the embroidering frame of an embroidering device by means of a frame size sensor and the embroidering frame is moved corresponding to the size to position the corner of a workpiece held in the embroidering frame under a needle. Then, an extra sewing operation is carried out over the corner to consume the lower thread remaining in the bobbin, and subsequently, it is decided whether or not the embroidering frame is moved by a distance required for completely extracting the lower thread from the bobbin (an amount of the residual lower thread is detected when the non-thread state is detected by the residual amount sensor).

Abstract: A thread winder unit, which is capable of winding thread of spools set on spool bars, is removably attached to a machine body. The sewing machine includes a feed motor for feeding the thread during sewing, an upper thread state detecting sensor disposed between the feed motor and the thread winder unit for detecting tensed thread, and a CPU for controlling thread winding operations based on a signal from the upper thread state detecting sensor. The sewing machine intermittently drives the feed motor in a reverse direction to that in the sewing to feed the thread toward the thread winder unit, every time the upper thread state detecting sensor detects the tensed thread, and the thread winder unit winds the fed thread around the spool. The CPU, recognizing the thread wound by a given amount, stops winding.

Abstract: There are provided an upper shaft clutch mechanism 140, a bobbin 22 including a slit 39, a horizontal holder 4 including an inner holder 18 and a blade tip 42, a bobbin driving member 11, bobbin driving member moving means 94 for moving the bobbin driving member 11 to freely advance or retreat between two positions having a separating position and a connecting position, a thread holding and catching member 48 including an upper thread holding portion 59, an upper thread engaging portion 60 and a thread position regulating portion 58 which are always set in a retreat position and are set in an entry position during a thread winding operation, thread holding and catching member moving means 53 for moving the thread holding and catching member 48 to freely advance or retreat between two positions having a retreat position and an entry position, and a thread winding operation control portion 193 for controlling the operation of each portion during the thread winding operation.

Abstract: In an embroidery sewing machine having a lower thread winding device, when the non-lower thread state of the bobbin is detected by a residual amount sensor, a sewing machine motor is stopped to detect and recognize the size of the embroidering frame of an embroidering device by means of a frame size sensor and the embroidering frame is moved corresponding to the size to position the corner of a workpiece held in the embroidering frame under a needle. Then, an extra sewing operation is carried out over the corner to consume the lower thread remaining in the bobbin, and subsequently, it is decided whether or not the embroidering frame is moved by a distance required for completely extracting the lower thread from the bobbin (an amount of the residual lower thread is detected when the non-thread state is detected by the residual amount sensor).

Abstract: A light pulse having a high intensity generated from LD pumped solid state laser is launched into optical fiber from its one end to generate induced Raman scattering. The induce Raman scattering light emitted from the other end of optical fiber has a wide spectrum of wavelengths with strong intensity. Thus obtained induced Raman scattering light is introduced into optical fiber under test from its one end. Subsequently, the backward scattering light returning to the aforementioned one end is taken out by means of optical coupler or optical switch to brought into optical detectors, which, in turn, detects the light so as to be measured on the intensity of the particular wave components by every period of time by means of digital averaging circuit and computer.

Abstract: A temperature distribution analyzer is disclosed. In the analyzer, a measuring optical fiber is provided so as to extend through a target region in order to analyze the temperature distribution of the region. A LD pumped solid state laser generates pulse light having high energy and supplies the pulse light to one of the terminal portions of an optical fiber. This causes a stimulated-Raman-scattering phenomenon in the optical fiber whereby Raman-scattered light is obtained from the other terminal portion of the excitation optical fiber. An optical filter selects light having a predetermined wavelength from the Raman-scattered light and outputs the selected light. An optical device introduces the output light of the optical filter to one of the terminal portions of the measuring optical fiber and receives Raman-backscattered light generated in the measuring optical fiber through the same terminal portion. A photodetector converts the Raman-backscattered light to an electrical signal.

Abstract: A ground guidance system for airplanes in which loop coils of a predetermined shape are continuously buried in a specific section of a taxiway for airplanes, an airplane is continuously detected based on changes of self-inductances of the loop coils with movement of the airplane while discriminating airplanes from other objects and admission or inhibition of advance in the specific section to a subsequent airplane according to the presence or absence of the airplane in the specific section and which has a fail-safe structure not generating an output at the time of a system or circuit failure or accident.

Abstract: This invention relates to an electronic sewing machine in which sewing data consisting of the needle sewing positions encoded for each stitch of a predetermined stitch pattern is stored. It comprises at least a memory for storing sewing data consisting of the encoded stitch data in group in regard to the stitches the needle sewing positions of which change regularly and the read out time data which instructs the reading out of the encoded stitch data by the number of times equal to the number of stitches encoded in group. This composition is effective not only in reducing the capacity required for storing stitch data but also shortening the time required to process the stitch data.