摘要:
A horizontal type DMISFET is remarkably improved in its endurance of an over-voltage applied to a drain electrode thereof. In this MIS type semiconductor device, an N+-type source region assuming an octagonal-shaped configuration in plan view is selectively formed in a first P-type base region in a manner such that the N+-type source region is disposed adjacent to a peripheral portion of a P+-type base region, provided that the N+-type source region is not disposed on a center line through which a center of an N+-type drain region is connected with a center of the first P-type base region.
摘要:
A mechanism for fast-forwarding/rewinding operations in which an intermittent gear driven by a motor is used for actuating a control member for advancing and releasing one or more of a head, pinch roller and idler for tape reproduction against the force of an elastic member while a lock means can lock the control member in the reproducing mode, the locked condition by the lock means being released by operation of one or both of the operation levers for fast-forwarding and rewinding operations.
摘要:
A power field effect transistor includes a bulge portion and/or a constricted portion in at least one of the heavily doped drain contact region and the lightly doped channel forming region, and heavily doped source regions are formed in the lightly doped channel forming region at intervals, wherein the avalanche breakdown takes place at the bulge portion and/or the constricted portion due to the concentration of electric field in the presence of excess voltage applied to the heavily doped drain contact region, and the breakdown current flows through the gaps between the heavily doped source regions so that a emitter-base junction of a parasitic bipolar transistor is not strongly biased.
摘要:
A ceramic device is disclosed that has a silicon base plate, a first ceramic film formed on a first surface of the silicon base plate, a second ceramic film formed on a second surface of the silicon base plate opposite to the first surface, and an operation opening formed in the silicon base plate between the first and second surfaces. A surface portion of the first ceramic film exposed to the operation opening Is a mirror surface having 0.05 micrometers or less of center line average height Ra. A mirror surface keeping film can be formed between the first surface of the silicon base plate and the first ceramic film for keeping a mirror surface in an etching step to etch the silicon base plate, and the silicon base plate can be reduced partially in the etching step for forming an operation opening thereby exposing a corresponding portion of the mirror surface keeping film to the operation opening.
摘要:
A transmission system in a cam mechanism having a cam and a driven member to be driven by the cam which comprises an electromagnetic plunger and a control member for having said driven member be driven by said cam while said electromagnetic plunger is energized and releasing said driven member from driving force of said cam when said electromagnetic plunger is deenergized.
摘要:
An operating device for switching a slide switch by moving a slide member of the slide switch in response to movement of an operating member includes an acting member which is provided on the operating member, is engageable with the slide member, and is movable against elastic force of an elastic member. The elastic force is slightly larger than the force necessary for slidable movement of the slide member and the stroke of the operating member is larger than that of the slide member.
摘要:
A semiconductor device enables a semiconductor element to turn off accurately and quickly at the time of short circuit of the load to protect the semiconductor element from the short circuit of the load. The semiconductor device comprises a first switching measure for turning on/off a current flowing into the load, a current detector for detecting current flowing into the load, a second switching measure for turning on/off a connection between the current detector and the load, and a controller for controlling the first switching measure and the second switching measure. The controller turns on the first switching measure, before turning on the second switching measure at the start of driving of the load. The current detector turns off the first switching measure when detecting excess current.
摘要:
A semiconductor device including first, second, third and fourth MOSFETs constituting an H bridge circuit. Each of the first and second MOSFETs is a vertical DMOSFET and each of the third and fourth MOSFETs is a lateral DMOSFET having a surface diffusion region formed in a portion of a drain region. The surface diffusion region has a conductivity type opposite that of a source region of the lateral DMOSFET and is electrically connected to the source region. Each of the surface diffusion regions may be made of a part of a channel stop region formed under a field insulator film. Each of the third and fourth MOSFETs may be a lateral DMOSFET having no surface diffusion region. Low on-resistance and small chip size of the device are obtained.