摘要:
A distance measuring device having a light projector and a light receptor, at least one of which is caused to move so that when the intersection of their optical paths is disposed at an object, its coincidence is detected by the signal generated in the light receptor for measuring the distance from the device to the object based on the triangulation. In order to obtain a clear peak signal, according to the invention, for the light source, use is made of a light energy distribution characteristic which is higher at the marginal zone than at the central zone.
摘要:
An optoelectronic device comprising a light-sensitive device which produces or modifies an electric current in dependence upon the intensity of light incident thereon, and a light-emitting device arranged to emit light in response to said electric current and so disposed that part of said emitted light is incident upon the light-sensitive device to provide positive feedback.
摘要:
The zener diode structure is fabricated by standard monolithic processes and provides a constant reference voltage for driving a high impedance load. The diode includes an anode element provided by P-type diffusion into an epitaxial layer. Electrical connections between the anode and the surface terminals of the device are provided by ''''base'''' diffusion. A cathode element is formed by an ''''emitter'''' diffusion which extends from the surface of the epitaxial layer, into the base diffusion, and borders the anode to form an anode-to-cathode junction. Since the base diffusion has a higher resistivity than the anode-to-cathode junction, buried breakdown occurs at the anode-to-cathode junction. The drive current for the zener is conducted by a path between a first anode terminal, which is connected to the base diffusion, and the cathode terminal. The constant reference voltage is developed between a second anode terminal, which is also connected to the base diffusion, and the cathode terminal.
摘要:
A Josephson tunnelling circuit is fabricated by forming layers of insulation and superconducting metallization on a substrate. The layers form Josephson tunnelling junctions, superconducting lines, superconducting contacts and other elements which may be needed. Josephson tunnelling junctions are formed by three layers, a thin tunnelling oxide between two superconducting layers. Superconducting contacts are formed between either of the two superconducting layers and an overlying third superconducting layer. The latter layer includes a metal, preferably indium, which has a free energy of oxide formation which is at least as high - or higher - than the alloys forming the first and second layers.
摘要:
High voltage planar diode structure having a semiconductor body with a planar surface. The body has a region of a first conductivity type extending to the surface and a second region in the body of opposite conductivity type and also extending to the surface and being defined by a dish-shaped P-N junction within said first region and extending to the surface. A layer of insulating material is provided on the surface and has an opening therein exposing the surface in an area overlying the second region. The insulating layer is graduated in thickness so that it becomes progressively thicker in a direction away from the opening in the insulating layer. Metallic means is disposed on the insulating layer and makes contact to said second region through the opening in the insulating layer and forms a field plate which generally overlies the depletion layer which is formed during operation of the diode.
摘要:
A transistor having a high inverse gain value, and especially a multi-emitter transistor, is provided both with an additional feedback emitter directly connected to the base and positioned adjacent to the base contact, together with a base resistor portion between the region of the base having the base contact and the additional emitter and the region of the base in which each other emitter is formed.
摘要:
A switching device is provided in a semiconductor structure including a first region with three regions in rectifying contact therewith and, additionally, an ohmic contact thereon. Two of the rectifying contacts are symmetrically disposed with respect to the third and to the ohmic contact on the first region to provide the equivalent of two matched transistors having common emitter and base regions. The ohmic contact on the first region may, for example, be located between or extend around the two symmetrically disposed rectifying contacts, or have an ''''E'''' or ''''H'''' shape, or it may extend around the third rectifying contact. When a switching signal is applied across the ohmic contact on the first region and the third rectifying contact a low impedance path is provided between the other two rectifying contacts.
摘要:
A metal-insulator semiconductor structure for use in particular as a switching element with thermally reversible memory and comprising a semiconductor substrate, a film of amorphous insulator material on the said substrate and a metallic film which is deposited at least partially on the said insulator film, characterized in that the said amorphous insulator film exhibits a resistivity which is lower than the intrinsic resistivity of the said amorphous insulator material and which is comprised between 107 and 1011 Omega -cm at ambient temperature, the decrease in the said resistivity being due to the diffusion of ions into the said amorphous insulator film, the said structure being in a conducting or insulating stage within a predetermined temperature range, in an insulating state above the said range and in a conducting state below the said range.
摘要:
Voltage-dependent resistor comprising a foil of insulating material in which semiconductor grains are embedded, which project from the foil on both sides and are in contact with electrode layers applied to both sides of the foil, the grains having a diameter of not more than 150 Mu and consist of a IIIV compound, preferably GaP having an energy gap of at least 1.1 eV.
摘要:
A semiconductor rectifier device particularly suited for mixing and/or detecting electric wave signals in the microwave frequency range and having a high resistance to RF burnout is disclosed. A semiconductive region having an impurity concentration greater than a prescribed amount is located in a semiconductor body of opposite polarity to the region. A metal in face to face contact with the region and the semiconductor body forms an N-type and a P-type Schottky-barrier junction. A PN junction is also defined at the interface of the semiconductive region and semiconductor body such that under the influence of a low signal level no injection occurs at the PN junction but under the influence of a high signal level large injection occurs at the PN junction causing a large change in the impedance and capacitance of the device. As a result the semiconductor device, previously matched to the line at low RF signal level becomes mismatched and highly reflective of RF energy at high RF signal level, thus preventing burnout. (For the purposes of this disclosure low signal level is defined as 1-2 mW. typically of electromagnetic energy but no greater than 50 mW. per diode, whereas high signal level is any electromagnetic energy over 50 mW.