A solid state electronic device comprising an element including two semiconductor crystal regions of different effective mass of carriers forming a junction therebetween, and electrodes for forming two orthogonal electric fields in said element, in which carriers may be totally reflected at the junction by controlling one of the two fields to cause an abrupt change in the current flowing through the element.

A hydraulic control system in a power shift transmission of a crawler type tractor which has a change-over valve connected to a first branched fluid passage branched from the fluid passage connecting a first speed valve to low speed clutches and also connected to a second branched fluid passage branched from the fluid passage connecting a second speed valve to a first turning valve, and a pressure-reducing valve connected to at least one of the branched fluid passages for reducing the hydraulic ...

The steering device for endless tracked vehicle provided with dual type power transmission mechanism capable of driving right and left endless track mechanisms separately, which comprises providing right and left clutches for forward and reverse movements between two pivotal turn valves, wherein when a pivotal turn is made, fluid selectively flows into the right and left clutches for forward and reverse movement through the liquid path from the pivotal turn valve as the speed valve for a speed c...

The present invention is directed to an ultrasonic sound source made up of diaphragms composed of rectangular plates adapted, in dimensions, to vibrate in a stripes mode, and mounted, in spaced relation and in multiple stages, on a longitudinal resonance rod which is connected to the horn of the vibrator to produce the ultrasonic waves above the audio-frequency. Thus, an intense ultrasonic sound source which is free from noises and is superior in radiation efficiency is provided.

A susceptor on which a wafer is placed, and an upper electrode are arranged in the processing chamber of an etching apparatus to oppose each other. An optical transmission window is disposed in the side wall of the processing chamber. The upper electrode and the susceptor are supplied with RF powers from a second RF power supply and a first RF power supply, respectively, to excite a plasma in the processing chamber. Emission of the plasma is detected by an optical detector through the optical tr...

An electric current control method for a servomotor using DQ conversion capable of increasing an acceleration torque and stabilizing a current control for deceleration when a voltage is saturated. It is determined whether the voltage command is saturated over a maximum voltage which a power amplifier is able to output (Step T1). When the voltage command is saturated, a saturation process is performed for rewriting an integrator of a Q-phase current control loop (Step T2), it is further determine...

When an initialization switch of the TV lens is turned on, an iris is opened and a zoom lens group is moved to a telephoto end automatically. An AF function moves a focus lens group to focus the TV lens according to a focus evaluation value obtained from a video signal. Then, the zoom lens group is moved to a wide end, and the AF function moves a master lens group to focus the TV lens according to the focus evaluation value. The focusing with the focus lens group while the zoom lens group is pla...

A servomotor control method capable of preventing an overshoot in positioning a movable part of a machine in the case where the position of the movable part is controlled in a full-closed loop. When an output P1 of a first acceleration/deceleration processing section of a bell-type acceleration/deceleration process becomes "0", a coefficient k3 of incomplete integration is set to a relatively small value .alpha., and a torque limit value TL is set to a relatively small value TLL. The incomplete ...

An image blur correcting apparatus is controlled in accordance with panhead data signals received from a panhead apparatus to save energy while compensating the performance of the panhead apparatus with an image blur correcting function of the image blur correcting apparatus. The panhead apparatus outputs a variety of panhead data signals such as a panhead identification signal representing the type of the panhead apparatus, a signal representing the panning or tilting operation, a signal repres...

There are provided a position control signal generating means and a rate control signal generating means for driving a master lens group. One of these two means is validated by means of a changeover switch. A macro-shooting controller including the rate control signal generating means also serves as a zoom controller. After the position control signal generating means is validated to adjust a flange back length, the rate control signal generating means is validated, and then the master lens grou...