Described is an internally mode stabilized injection laser. Stabilization is obtained in a coupled cavity structure where one cavity is passive. The passive cavity is a high efficiency waveguide with dimensions chosen to suppress unwanted modes.

The invention relates to a charged-coupled transversal filter of the parallel-in series-out (PISO) type having a buried channel of one conductivity type and zones diffused into the channel of the other conductivity type, which zones constitute the clock electrodes. The inputs also comprise a zone of the one conductivity type which is provided in the associated zone of the second conductivity type. The weighting factors are formed by selecting the sizes of these zones, which constitute the emitte...

An automatic information transmission system for a mobile object, the system including a response unit arranged to be carried along with the mobile object, and an interrogation unit arranged to be disposed alongside the path of movement of the mobile object for movement of the response unit past the interrogation unit. The interrogation unit is arranged to emit a carrier signal at a first frequency and to receive a signal at a second frequency different from the first frequency. The response uni...

A flexible coupling is disclosed for joining together shaft sections to form one continuous shaft which may be rotatably driven by a drive means provided at one end of the continuous shaft.

A squeegee attachment for a wet/dry vacuum cleaner having an elongate cleaning head and a deformable blade inserted into the head such that the blade barely extends past a lower portion of the cleaning head which forms part of a suction part, the blade effectively blocking the part in its nondeformed position and opening the part in its deformed position so as to create a maximum amount of suction at the surface to be cleaned.

A laser employs a Fabry-Perot etalon, coupled to an optical cavity, to control either the power or the frequency of the laser substantially independently.

A pointing device comprises a mouse tablet having a regular repetitive pattern of field sensitive pixels on the surface thereof, and a mouse including coupling elements movable across the mouse tablet, wherein the coupling elements establish position-dependent field coupling with the pixels. Analysis of the coupling yields mouse motion and direction of motion. In one embodiment, the pixels are deployed in rows and columns and a pair of coupling elements are provided for sensing motion and direct...

An improved loop coupled YIG resonator has a coupling loop of three sections, a loop section partially encircling a YIG resonator, and two straight end sections. The end sections together with a ground plane enclosing one end of the resonator cavity form a transmission line, the characteristic impedance of which is determined by the distance of the end section above the ground plane. The characteristic impedance is chosen to match the transmission line input to which the coupling loop is connect...

A programmable oscillator includes first and second transistors having their emitters coupled by a capacitor, and a pair of current sources coupling respective transistors to ground. A switching means is provided having a first state coupling the collector of the first transistor to the base of the second transistor and coupling the collector of the second transistor to the base of the first transistor, and a second state coupling the collectors of the first and second transistors to ground such...

In a microwave device, for example a microwave local oscillator with a harmonic mixer for feedback control, problems of coupling the mixer circuit to the R.F. cavity are overcome by providing a d.c. blocking capacitor of the mixer on a planar surface of a support extending across an aperture in one wall of the cavity. In preferred embodiments the capacitor is a planar device formed by a plurality of interdigitated fingers. These fingers are oriented to couple magnetically with the R.F. energy at...