摘要:
A zoom lens comprises a first lens group having a positive refractive power and a second lens group having a negative refractive power sequentially from an object to be photographed. The first lens group comprises an aperture, a front group including at least two lens components having a positive refractive power, and a lens component which has a negative refractive power and an object-side lens surface of which has a concave surface directed toward an object side, and a rear group located nearer to an image than the aperture and including at least one lens component having a positive refractive power. The front group is located nearer to the object than the aperture and has a positive refractive power as a whole. The second lens group comprises at least one lens component having a positive refractive power and at least two lens components having a negative refractive power. A relative distance between the first and second lens groups is changed to perform zooming.
摘要:
A zoom lens comprises a first lens group having the positive refractivity which relatively travels along the optical axis to change the distance between the groups for varying powers, and a second lens group having negative refractivity. The first lens group has sequentially from an object side a first positive lens component, a second negative lens component, a third lens component having positive refractivity, a fourth positive lens component, and fifth lens component having positive refractivity, and the second lens group has sequentially from the object side a sixth positive lens component, a seventh negative lens component, and an eighth negative lens component. Further, the first lens group includes a diaphragm adjacent to the fifth lens component, and the zoom lens is characterized in being structured to satisfy conditions given below.78
摘要:
A centrifugally cast composite roll comprising an outer layer having a composition comprising by mass 2.5-9% of C, 0.1-3.5% of Si, 0.1-3.5% of Mn, and 11-40% of V, the balance being Fe and inevitable impurities; an intermediate layer made of a high-speed steel alloy, which is formed inside the outer layer; and an inner layer made of cast iron or steel, which is formed inside the intermediate layer.
摘要:
To provide an electrode unit for a prismatic battery capable of increasing the output of the battery while suppressing the battery internal resistance value and improving the degree of freedom of the size of the electrode plate. An electrode unit for a prismatic battery including an electrode group in which positive electrode plates and negative electrode plates in an almost rectangular shape are alternately stacked with separators interposed therebetween. In each of the positive electrode plate and the negative electrode plate, core material exposed portions are formed at least on two side edges. The positive electrode plates and the negative electrode plate are stacked such that their core material exposed portions are directed not to overlap each other in the stack direction. The electrode unit for a prismatic battery includes a positive current collector having a shape capable of joining to all of the core material exposed portions of the positive electrode plates constituting the electrode group, and a negative current collector capable of joining to all of the core material exposed portions of the negative electrode plates constituting the electrode group, not in contact with the positive current collector.
摘要:
To a column line to which a selected memory cell is connected, a write bias voltage is supplied through a selection gate transistor having different channel conductivity type than the memory cell transistor. Current drivability of the selection gate transistor is adapted to be larger than a leak current of the memory cell and to supply a current smaller than the channel current when a channel is formed in one aspect. When a verifying voltage is applied to the selected word line, a large channel current flows when a channel is formed, potential of a subbit line is changed accordingly, and programming is suppressed. In another aspect, the selection gate transistor serves as a constant current source to make the programming speed of the memory cells constant. Thus distribution of threshold values after programming can be made narrow.
摘要:
For taking a characteristic impedance matching of signal transmission lines in a package which carries thereon a semiconductor chip with a very high-speed LSI formed thereon, there is provided a semiconductor integrated circuit device wherein one ends of signal transmission lines formed on a main surface of a package substrate are extended up to the position just under pads formed on a main surface of the semiconductor chip and are connected to the pads on the chip electrically through bump electrodes, while opposite ends of the signal transmission lines are extended to the outer peripheral portion of the main surface of the package substrate and outer leads are bonded thereto.
摘要:
A strain detector includes a passive member for receiving an external force, magnetostrictive layers formed on a surface of passive member and made of a magnetic material containing nickel and at least one kind of metal sulfide produced from reaction of a metal more reactive with sulfur than nickel with sulfur as an impurity, and a detection coil provided close to an exterior of magnetostrictive layers and used for detecting variations of permeability caused by strain of the magnetostrictive layers in response to the external force.
摘要:
An air intake device for an automotive vehicle which comprises a upper shroud member interconnecting front ends of a pair of wheel apron reinforcements and a radiator disposed below the upper shroud member. An intake port of an intake duct for the vehicle is disposed near an upper portion of the upper shroud member. The air intake device also includes a sealing panel member disposed in front of the upper shroud member for forming an air passage which leads fresh air to the intake port. The sealing panel member comprises a pair of panels which forms a part of the air passage between both inside ends of the panels.
摘要:
A spool of a valve main body is switched and driven by exciting a solenoid coil by supplying a DC or AC voltage. An intensity of the magnetism generated by the excitation of the solenoid coil is detected by a magnetic sensor. When a predetermined sensor output is obtained, an indicator lamp is lit to indicate that the spool has operated correctly. The intensity of the magnetism due to the DC excitation is detected by magnetoresistive devices. The intensity of magnetism due to the AC excitation is detected by a pickup coil or a current transformer.
摘要:
A poppet valve in which a poppet is slidable in a valve body and opens or closes a main valve path for pressurized fluid at one end. The pressurized fluid is conveyed to a back pressure chamber at the rear of the poppet either through a reduced flow path or through a valve arrangement between the surfaces of the poppet and a poppet spool slidable within the poppet. Either a control rod or the poppet spool moving relative to the poppet opens a flow path at the side of the back pressure chamber and the flow continues through a hollow in the spool or the control rod to an oil chamber away from the back pressure chamber where it is released to a tank.