A beam amount of a diode gun type pick-up tube is controlled in response to an incident light amount. Such beam control is carried out by making an excess beam amount constant. The calculation of the excess beam amount is done by subtracting a control electrode current and a signal current from a cathode current in case of the diode gun type pick-up tube.

A tantalum condenser includes a metallic electrode cap; a tantalum material fitted to the metallic electrode cap; a cylindrical metallic electrode facing to the metallic electrode cap; a tantalum lead projected from one end surface of the tantalum material; and a projection formed integrally with one end surface of the metallic electrode, and welded to the tantalum lead, wherein a part of the metallic electrode cap, the tantalum material, a part of the metallic electrode, the tantalum lead and t…

In a method for forming a coil and a coil formed by the method, a first wire having a thick insulating coating is inserted into a hole of a workpiece and wound around a peripheral surface of the workpiece to form a first winding layer, and a second wire having a thin insulating coating is continuously wound around the first wire to form a second winding layer so that a coil apparatus is formed. A junction between the ends of the first wire and the second wire serves as an intermediate tap for th…

Disclosed is a semiconductor device, such as a solid-state imager or a delay line, having its body and a peripheral circuit formed on the same chip, in which the peripheral circuit is divided into segments and dispersedly arranged around the body of the device. Such an arrangement reduces influence of dark current on the signal, which has been an outstanding problem encountered in such a semiconductor device.

A microwave circuit having a transmission line, a conductor and a dielectric gripped therebetween is disclosed. In this case, stubs are provided on the transmission line in at least two positions, at least one of the stubs extends across the transmission line to the both sides thereof with different lengths, and the distance between adjacent stubs and the lengths thereof are so selected that the transmission line has a predetermined frequency band and attenuation characteristics.

A diaphragm for an electro acoustic transducer, such as a loudspeaker, includes first and second parallel sheet members, a honeycomb core member sandwiched between the sheet members, and a damping layer interposed between each sheet member and the honeycomb core member for increasing the internal energy loss of the diaphragm.

A multi-channel recording and/or reproducing apparatus is disclosed, wherein a plurality of rotary magnetic heads scan a magnetic tape to form a plurality of skewed parallel tracks simultaneously. These heads are aligned substantially in the scanning direction on a single head base plate. Preferably, these heads are so secured as to form parallel skewed tracks without guardbands therebetween. Each head has the same thickness, and is mounted on a head base. Even though the thickness of each head …

In an electronic circuit arrangement mounted on a printed circuit board in which leadless circuit parts are attached to the printed circuit board with adhesive. A white paint is applied onto a region to which adhesive is applied, and an adhesive containing pigment contrastable to the white paint is applied onto the paint.

There are provided an optical disc and an optical recording apparatus to form a tracking groove onto an optically recordable disc. This apparatus comprises: a recording beam generator to generate a recording beam such as a laser beam having a predetermined spot size so as to form a pattern of a predetermined width onto the disc; a light deflector arranged on an optical path of the recording beam generator; and a driver for driving the light deflector for reciprocally moving the recording beam in…

A digital recording and reproducing system for ME tape uses a class 4 partial-response encoder in the recording apparatus and a corresponding decoder in the reproducing apparatus. A high signal-to-noise ratio is achieved without the need for a phase equalizer.