A planar coil includes a winding of N turns (N is an integer greater than or equal to 2). Letting r.sub.i (n) be a radius of an inner circumference of a winding portion at the n.sup.th turn (n is an integer greater than or equal to 1 and less than or equal to N) from the inner side; r.sub.o (n) be a radius of an outer circumference of the same; r.sub.min be a radius of an inner circumference of the innermost winding portion; W.sub.total be a difference between a radius of an outer circumference ...

A sound generating transducer or speaker including a vibratable diaphragm on a frame and in spaced and confronting relation with a polarity defining backing, preferably magnetic in nature, conductive means on the diaphragm to receive an audio frequency electric signal to cause attraction and repulsion between the diaphragm and the backing, the diaphragm being divided into definite vibratable areas by divider strips bearing against the diaphragm such that each diaphragm area has a fundamental res...

A planar receptacle for pluggable mounting of electronic component leads therein which is formed by applying a resilient, electrically conductive material over an apertured base, and forming a pattern of planar cuts in said resilient layer over each aperture in the base such that when an electronic component lead is pressed onto the resilient layer over an aperture, the resilient layer will deform into the aperture to form at least one contact apron capable of supporting said electronic componen...

For measuring the viscosity of a thin planar film of fluid which may be simple, may contain solid particles in suspension, may be a mixture of several fluids, or may be any combination of these; a planar viscometer including (1) a mixing tank, (2) a planar flow generator including in series a long straight cylinder, a long diffuser, a short converging nozzle and a planar transition section of constant section, and (3) means forming a laminar flow passage.

A plane antenna comprises a power-supply circuit, a radiator circuit and an earthing conductor which are stacked respectively with a dielectric layer interposed between them, in which the power-supply and radiator circuits are made independent of each other as electromagnetically coupled to each other and at least one of the dielectric layers is formed with a foamed resin, whereby insertion loss can be reduced to remarkably improve the antenna characteristics. Only with the interposition of the ...

A digging machine for planing a road. The machine has a massive main frame supported by large endless tracks. An elongated digging member has spaced shafts located at the opposed ends thereof. One of the shafts pivotally supports the digging member from the rear end of the main frame, while the other shaft rotatably supports a digging head. The digging head is rotated by spaced, endless chains that are driven by sprockets located on the pivot shaft and thereby rotates sprockets located on the ot...

A spring is constructed as a resilient U-shaped piece comprising a middle portion and leg portions disposed in the same plane, the leg portions including a bearing for taking an external load. The bearings are disposed on the leg portions in such a manner that a line passing through the centers of the bearings is parallel to the middle portion.

An improved bellows for use with a folding camera comprises a sheet of opaque resilient material, extending over an opening in the camera body. When the camera is folded, the bellows material is collapsed to a substantially flat plane, and when the camera is unfolded, the bellows material is expanded to define a light-tight, tent-like extension from the back of the camera. In a preferred embodiment of the invention, the bellows material possesses a dimpled, or wrinkled microstructure such that t...

A planar antenna is provided, at optional power-supply terminals in power-supply circuit pattern provided in parallel with radiation circuit pattern and ground conductor layer, with additional power-supply terminals having a phase difference of an integer multiple of wavelength .lambda.g, while the radiation circuit pattern is provided with additional radiation elements respectively corresponding to each of the additional power-supply terminals, whereby the planar antenna can be made to attain a...

A planar antenna comprising a dielectric layer containing a homopolymer of 3-methylbutene-1 or a copolymer of 3-methylbutene-1 and an alpha-olefin of from 2 to 12 carbon atoms, a polyene or a mixture thereof, a conductor laminated on the whole back surface of said dielectric layer and a circularly polarized radiation microstrip element formed from a metal foil and provided on the other surface of said dielectric layer.