Abstract: The present invention provides a machine tool capable of achieving a higher feed rate of a spindle and weight reduction while ensuring necessary stiffness of a column. The present invention includes: a bed 2; a saddle 4 disposed on the bed 2 to be movable in a Y-axis direction in a front view of the machine; a table 5 disposed on the saddle 4 to be movable in an X-axis direction; a column 3 having a shape of a gate that is bridged over a travel range of the table 5 and has right and left legs 3a fixed on the bed 2 and a beam connecting tops of the right and left legs 3a; and a spindle head 6 disposed on a front face of the beam 3b to be movable in a Z-axis direction.

Abstract: A liquid crystal device comprising: at least,

Abstract: A spindle device of a machine tool such as a milling machine and a machining center and a method of replacing a spindle, the spindle device wherein the housing of a spindle head (5) is divided into a front housing (23) and a rear housing (25), a spindle (7) is installed in the front housing (23) through front bearings (9), and a built-in motor rotor (43), a bearing case (33) through rear bearings (11), and a draw bar (51) for clamping a tool are installed on and in the spindle (7) to form a front housing unit (93); the method comprising the step of replacing the spindle (7) and the bearings by replacing the front housing unit (93), whereby, when the spindle device comes out of order, the spindle and bearings can be easily replaced in a short time and the stop time of the machine tool can be minimized at a site where the machine tool is used.

Abstract: A shaft bearing structure of spindle motor, which holds a rotor rotationally by a shaft bearing and a bearing holder fixed on a motor base of a stator, the rotor is fixed with a spindle shaft and confronted with the stator, an oil cycle material retains and re-flows lubricating oil circulating around the spindle shaft in the shaft bearing, wherein the oil cycle material is placed in the gap between the inner circumference of the bearing holder and the periphery of the spindle shaft, and placed at least contiguous to one edge of the shaft bearing in axial direction of the spindle shaft.

Abstract: A capacitor C1 and a switch element SG are provided in the primary side of a transformer TT in a start-up circuit 5. Charge stored in the capacitor C1 is discharged when the switch element SG is turned on. A capacitor C2 and a rectifying element D2 are inserted between the output of a DC-AC converting circuit 4 and ground. The capacitor C2 is charged by a current flowing in the forward direction of a rectifying element D2. A capacitor C3 and a rectifying element D3 are inserted between a node between the secondary winding T2 of a transformer T and a rectifying element D1, which form a DC-DC converting circuit 3, and a node on a line connecting the second capacitor C2 and the rectifying element D2. The capacitor C3 is charged by a current flowing in the direction as defined by the third rectifying element D3. A node between the capacitor C3 and the rectifying element D3 is connected to a voltage supplying line to the capacitor C1 of the start-up circuit 5, whereby its charge is stored.

Abstract: In a discharge-lamp lighting circuit 1, a DC-DC converter circuit 3 for boosting or lowering DC input voltage Vin from a DC power supply 2, a DC-AC converter circuit 4 for converting the output voltage of the DC-DC converter circuit to AC voltage, and a control circuit 9 for controlling the supply of electric power to a discharge lamp 6 are provided. Further, the supply of power to the discharge lamp 6 is decreased in response to the lowering of the DC input voltage when the lowering of the DC input voltage Vin is detected. The supply of power to the discharge lamp 6 is lowered as the ambient temperature rises even though the lowering of the DC input voltage Vin remains unchanged.

Abstract: A discharge lamp device for a vehicle includes a lighting circuit for performing lighting controls of a discharge lamp for high beam and a discharge lamp for low beam, both lamps having the same rating. The lighting circuit controls the power supply such that the electrical power input when the discharge lamp for high beam is lighted is greater than the electrical power input when the discharge lamp for low beam is lighted.

Abstract: A shaft bearing structure of spindle motor, which holds a rotor rotationally by a shaft bearing and a bearing holder fixed on a motor base of a stator, the rotor is fixed with a spindle shaft and confronted with the stator, an oil cycle material retains and re-flows lubricating oil circulating around the spindle shaft in the shaft bearing, wherein the oil cycle material is placed in the gap between the inner circumference of the bearing holder and the periphery of the spindle shaft, and placed at least contiguous to one edge of the shaft bearing in axial direction of the spindle shaft.

Abstract: A low phosphorous lubricating oil composition for internal combustion engines comprising an alkylthiocarbamate compound of the formula: wherein each of R1, R2, R3, and R4 independently represents an alkyl group of 1-18 carbon atoms, and (X) represents S, S—S, S—CH2—S, S—CH2CH2—S, S—CH2CH2CH2—S, or S—CH2CH(CH3)—S, and additive compositions and additive packages utilizing the above compound.

Abstract: In a discharge-lamp lighting circuit 1, a DC-DC converter circuit 3 for boosting or lowering DC input voltage Vin from a DC power supply 2, a DC-AC converter circuit 4 for converting the output voltage of the DC-DC converter circuit to AC voltage, and a control circuit 9 for controlling the supply of electric power to a discharge lamp 6 are provided. Further, the supply of power to the discharge lamp 6 is decreased in response to the lowering of the DC input voltage when the lowering of the DC input voltage Vin is detected. The supply of power to the discharge lamp 6 is lowered as the ambient temperature rises even though the lowering of the DC input voltage Vin remains unchanged.

Abstract: A capacitor C1 and a switch element SG are provided in the primary side of a transformer TT in a start-up circuit 5. Charge stored in the capacitor C1 is discharged when the switch element SG is turned on. A capacitor C2 and a rectifying element D2 are inserted between the output of a DC-AC converting circuit 4 and ground. The capacitor C2 is charged by a current flowing in the forward direction of a rectifying element D2. A capacitor C3 and a rectifying element D3 are inserted between a node between the secondary winding T2 of a transformer T and a rectifying element D1, which form a DC-DC converting circuit 3, and a node on a line connecting the second capacitor C2 and the rectifying element D2. The capacitor C3 is charged by a current flowing in the direction as defined by the third rectifying element D3. A node between the capacitor C3 and the rectifying element D3 is connected to a voltage supplying line to the capacitor C1 of the start-up circuit 5, whereby its charge is stored.

Abstract: A low phosphorous lubricating oil composition for internal combustion engines comprising an alkylthiocarbamate compound of the formula: 1

Abstract: A lighting system provides an auxiliary lighting circuit for turning on an auxiliary light source in place of the discharge lamp if the abnormality in the lighting circuit is detected.

Abstract: When a photopolymerization compound (molecular weight: not less than 300) having at least two ultraviolet light sensitive portions in its molecular structure is mixed with ferroelectric liquid crystal and an exposure to ultraviolet light is performed, a continuous structure is formed over almost whole length between two glass substrates, and a continuous twisted structure is formed between the glass substrates in the state of liquid crystal molecular orientation. Before the exposure to ultraviolet light, the photopolymerization compound does not exhibit satisfactory compatibility with the ferroelectric liquid crystal to be mixed, but exhibits phase separation in the mixed state. The ferroelectric liquid crystal has a bookshelf layer structure.

Abstract: A steady-state condition in which respective discharge lamps for main beam and for dipped beam are both turned on, a sum (P1+P2) of a value of power supplied to each discharge lamp is controlled to be smaller than a sum (P1R+P2R) of a rated power value for each discharge lamp.