Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Abstract: An impact fastening tool may include a motor; a hammer configured to be rotationally driven by the motor; an anvil configured to be hit in a rotational direction by the hammer; a signal obtainer configured to obtain a variable signal which varies in accordance with a hit to the anvil by the hammer; and a seating determiner configured to determine whether or not a fastener has been seated based on the variable signal obtained by the signal obtainer, wherein the seating determiner is configured to determine whether or not the fastener has been seated based on a signal component of the variable signal obtained by the signal obtainer, the signal component corresponding to a predetermined reference frequency.

Abstract: An impact fastening tool may include a motor; a hammer configured to be rotationally driven by the motor; an anvil configured to he hit in a rotational direction by the hammer; a signal obtainer configured to obtain a variable signal. which varies in accordance with a hit to the anvil by the hammer; and a seating determiner configured to determine whether or not a fastener has been seated based on the variable signal obtained by the signal obtainer, wherein the seating determiner is configured to determine whether or not the fastener has been seated based on a signal component of the variable signal obtained by the signal obtainer, the signal component corresponding to a predetermined reference frequency.

Abstract: The present application discloses an apparatus including: a motor model that reflects a characteristic of a motor and includes at least inputs pertaining to a first quantity of state and a second quantity of state and an output pertaining to a third quantity of state; a comparator that calculates a difference between the third quantity of state in an actual motor and the third quantity of state output from the motor model; and an amplifier that amplifies an output of the comparator at a predetermined gain. The first quantity of state in the actual motor is input into the motor model as the first quantity of state, and an output of the amplifier is input into the motor model as the second quantity of state. The apparatus then uses the output of the amplifier as an estimated value of the second quantity of state in the actual motor.

Abstract: The present application discloses an apparatus including: a motor model that reflects a characteristic of a motor and includes at least inputs pertaining to a first quantity of state and a second quantity of state and an output pertaining to a third quantity of state; a comparator that calculates a difference between the third quantity of state in an actual motor and the third quantity of state output from the motor model; and an amplifier that amplifies an output of the comparator at a predetermined gain. The first quantity of state in the actual motor is input into the motor model as the first quantity of state, and an output of the amplifier is input into the motor model as the second quantity of state. The apparatus then uses the output of the amplifier as an estimated value of the second quantity of state in the actual motor.

Abstract: A motor speed control system includes a pulse outputting device capable of outputting a pulse each time a motor rotates, a pulse interval determining device capable of determining a pulse interval between the pulses outputted, and a comparative value calculating device capable of obtaining a comparative value as the product of a first value and a second value. The first value can correspond to the pulse interval determined, and the second value can correspond to a set rotational speed of the motor. The system can further include a set value calculating device capable of obtaining a set value as the product of the second value and a third value and a controller capable of controlling a supply of power to the motor such that a difference between the set value and the comparative value decreases.

Abstract: A motor speed control system includes a pulse outputting device capable of outputting a pulse each time a motor rotates, a pulse interval determining device capable of determining a pulse interval between the pulses outputted, and a comparative value calculating device capable of obtaining a comparative value as the product of a first value and a second value. The first value can correspond to the pulse interval determined, and the second value can correspond to a set rotational speed of the motor. The system can further include a set value calculating device capable of obtaining a set value as the product of the second value and a third value and a controller capable of controlling a supply of power to the motor such that a difference between the set value and the comparative value decreases.

Abstract: Power tool 1 may include table 5 on which work W is positioned. A portion of a circular blade 3 protrudes above table 5. Circular blade 3 may be driven by a motor. The motor may be controlled by a control device 90. Work W is cut by means of an operator sending work W positioned on an upper face of table 5 in the direction of the circular blade 3 while circular blade 3 is being driven by the motor. Power tool 1 may include first radar device 86 and second radar device 87 for monitoring a predetermined area in the vicinity of circular blade 3. First radar device 86 may detect whether objects other than work are present in the vicinity of a outer edge of circular blade 3. Second radar device 87 may detect the location of objects moving within the predetermined area in the vicinity of circular blade and detects the speed at which the objects are moving in the direction in which work is sent.

Abstract: A radar device for measuring distance within short range is provided. The radar device has a first wave-detecting circuit for multiplying radio wave voltage being transmitted from a transmitting antenna by radio wave voltage being received by a receiving antenna, in addition, the device has a second wave-detecting circuit for multiplying radio wave voltage being transmitted from the transmitting antenna by radio wave voltage shifted by the shifting means from the radio wave being received by the receiving antenna. Alternatively, the second wave-detecting circuit may multiply radio wave voltage shifted by the shifting means from the radio wave being transmitted from the transmitting antenna by radio wave voltage being received by the receiving antenna. Based on output voltages from the first and second detecting circuit, the distance to the target may be decided unambiguously.

Abstract: Power tool 1 may include table 5 on which work W is positioned. A portion of a circular blade 3 protrudes above table 5. Circular blade 3 may be driven by a motor. The motor may be controlled by a control device 90. Work W is cut by means of an operator sending work W positioned on an upper face of table 5 in the direction of the circular blade 3 while circular blade 3 is being driven by the motor. Power tool 1 may include first radar device 86 and second radar device 87 for monitoring a predetermined area in the vicinity of circular blade 3. First radar device 86 may detect whether objects other than work are present in the vicinity of a outer edge of circular blade 3. Second radar device 87 may detect the location of objects moving within the predetermined area in the vicinity of circular blade and detects the speed at which the objects are moving in the direction in which work is sent.

Abstract: Power tool 1 may include table 5 on which work W is positioned. A portion of a circular blade 3 protrudes above table 5. Circular blade 3 may be driven by a motor. The motor may be controlled by a control device 90. Work W is cut by means of an operator sending work W positioned on an upper face of table 5 in the direction of the circular blade 3 while circular blade 3 is being driven by the motor. Power tool 1 may include first radar device 86 and second radar device 87 for monitoring a predetermined area in the vicinity of circular blade 3. First radar device 86 may detect whether objects other than work are present in the vicinity of a outer edge of circular blade 3. Second radar device 87 may detect the location of objects moving within the predetermined area in the vicinity of circular blade and detects the speed at which the objects are moving in the direction in which work is sent.

Abstract: Power tool (10) may include solenoid coil (1) that functions as a drive source for plunger (5). Battery (3) may be connected with solenoid coil (1), battery (3) supplying a current to solenoid coil (1). Solenoid coil (1) may store magnetic energy while current from battery (3) flows through solenoid coil (1). The magnetic energy stored in solenoid coil (1) may be transformed into kinetic energy of plunger (5), whereby plunger (5) being moved from a first position to a second position. The magnetic energy stored in solenoid coil (1) is determined by the current flowing through solenoid coil (1) and has no relationship with the voltage of battery (3). Consequently, sufficient power can be conveyed to plunger (5) even if the voltage of battery (3) is low.

Abstract: A radar device for measuring distance within short range is provided. The radar device has a first wave-detecting circuit for multiplying radio wave voltage being transmitted from a transmitting antenna by radio wave voltage being received by a receiving antenna, in addition, the device has a second wave-detecting circuit for multiplying radio wave voltage being transmitted from the transmitting antenna by radio wave voltage shifted by the shifting means from the radio wave being received by the receiving antenna. Alternatively, the second wave-detecting circuit may multiply radio wave voltage shifted by the shifting means from the radio wave being transmitted from the transmitting antenna by radio wave voltage being received by the receiving antenna. Based on output voltages from the first and second detecting circuit, the distance to the target may be decided unambiguously.

Abstract: Power tool 1 may include table 5 on which work W is positioned. A portion of a circular blade 3 protrudes above table 5. Circular blade 3 may be driven by a motor. The motor may be controlled by a control device 90. Work W is cut by means of an operator sending work W positioned on an upper face of table 5 in the direction of the circular blade 3 while circular blade 3 is being driven by the motor. Power tool 1 may include first radar device 86 and second radar device 87 for monitoring a predetermined area in the vicinity of circular blade 3. First radar device 86 may detect whether objects other than work are present in the vicinity of a outer edge of circular blade 3. Second radar device 87 may detect the location of objects moving within the predetermined area in the vicinity of circular blade and detects the speed at which the objects are moving in the direction in which work is sent.

Abstract: Power tool (10) may include solenoid coil (1) that functions as a drive source for plunger (5). Battery (3) may be connected with solenoid coil (1), battery (3) supplying a current to solenoid coil (1). Solenoid coil (1) may store magnetic energy while current from battery (3) flows through solenoid coil (1). The magnetic energy stored in solenoid coil (1) may be transformed into kinetic energy of plunger (5), whereby plunger (5) being moved from a first position to a second position. The magnetic energy stored in solenoid coil (1) is determined by the current flowing through solenoid coil (1) and has no relationship with the voltage of battery (3). Consequently, sufficient power can be conveyed to plunger (5) even if the voltage of battery (3) is low.

Abstract: A lighting device includes a mount adapted to be attached to a power tool. A flexible support extends from the mount and permits the lighting device to be oriented in any desired direction. A fluorescent lamp is mounted on the flexible support opposite to the mount. An electric circuit serves to light the fluorescent lamp and includes an inverter circuit.

Abstract: A lighting device includes a mount adapted to be attached to a power tool. A flexible support extends from the mount and permits the lighting device to be oriented in any desired direction. A fluorescent lamp is mounted on the flexible support opposite to the mount. An electric circuit serves to light the fluorescent lamp and includes an inverter circuit.