Abstract: A high speed projection lens system particularly adaptable for a television projection system having a viewing screen and a video image forming surface is provided. The projection lens system includes a first thin meniscus lens element convex to the projection screen having an aspherical Fresnel type surface; a second thin meniscus lens element concave to the projection screen having an aspherical Fresnel type surface and a weak third thin aspherical meniscus lens element.

Abstract: A separator for separating micron and submicron sized particles from a carrying gas, is disclosed. A carrier gas contains a component which is capable of condensation in the separator. The carrier gas is accelerated and flows at high velocity in a duct. The lower limit of the high velocity is approximately Mach 1.0. Due to the acceleration to the high velocity the static temperature of the carrying gas decreases. As a result, the condensable component condenses on micron and mainly on submicron sizes particles which act as nucleation sites. Liquid droplets formed during the condensation are in the micron size range. The paths of the high velocity flow of the carrier gas and of the solid and liquid particles carried therein is influenced by a combination of a centrifugal force and an oblique shock zone which is created within the high velocity flow. As a result, the particles travel a different path than the carrying gas and are effectively captured and disposed by an appropriately positioned receiving member.

Abstract: A hollow pentagonal roof type reflecting mirror assembly for use in a viewfinder optical system of a single lens reflex camera is dust tight to prevent entry of dust into the inside hollow space and includes a filtered vent aperture to allow passage of vapor so that condensation will not occur inside the assembly. The assembly includes a hollow pentagonal body having roof and front mirrors and at least one vent aperture and a shielding or sealing member arranged to close the vent hole. The shielding or sealing member is made of a dust proof and ventilative material such as a foamed plastic, a paper and a cloth to filter out any dust particles.

Abstract: The present invention is directed to an inverted telephoto type wide angle lens system having eight lens groups and eight lens elements which fulfill the following conditions:______________________________________ 0.75f < .vertline.f.sub.1,2,3 .vertline. < 1.1f f.sub.1,2,3 < 0 0.89f < f.sub.1,2,3,4,5 < 2.3f 0.5 < d.sub.7 /d.sub.6 < 2.0 1.0 < d.sub.8 /d.sub.10 < 2.4 1.5 < d.sub.7 /d.sub.9 < 5.2 ______________________________________wherein f.sub.1,2,3 represents the total focal length of the first to third single lens elements; f.sub.1,2,3,4,5 represents the total focal length of the first to fifth single lens elements; f represents the focal length of the entire lens system, and d.sub.i represents the i-th axial distance numbered consecutively from the front of the lens system.

Abstract: A densitometer apparatus is disclosed which is adapted for accurately measuring the density of a liquid and particularly of a slurry flowing in a pipeline. The apparatus includes a pipe section which is coupled to the rest of the pipeline by substantially friction and resistance free hydrostatic bearings in such a manner that the pipe section is able to move, at least to a limited extent, in a direction parallel with the earth's gravitational field. The weight of the pipe section is accurately measured together with the weight of the slurry or liquid contained therein by load cells, strain gauges or the like. A unique flow velocity meter is also disclosed. The flow velocity meter includes two densitometers positioned at a predetermined distance from one another on the pipeline, and measures the time it takes a density fluctuation pattern to travel from one densitometer to another.

Abstract: An improved tesser type objective lens system having a rear aperture stop with a relatively wide field angle of about 60.degree. and an F-number of about F 2.8 is provided. The thickness of the second negative lens in the lens system is increased relative to the total axial distance of the lens system which permits the reduction of the Petzval sum while maintaining a balance correction of spherical aberration and coma.

Abstract: A toy device adapted for threading beads upon a thread or line is disclosed. A container for beads is mounted to a preferably transparent chassis. The container has an outlet port or hole in a lower part thereof through which beads may fall out of the container one-by-one. A first end of the guide wire or like member is mounted substantially in the center of the outlet port. The container is continuously shaken through a hand actuated crank and ratchet gear assembly. As a result of the shaking, the beads undergo a random motion which eventually causes the beads to fall one-by-one through the outlet port onto the guide wire with the guide wire substantially centered in the central aperture of each bead. A bead advancing assembly which comprises two rotatable members having cut-away portions to capture the beads, is operatively associated with an intermediate portion of the guidewire.

Abstract: An electrical coupler for transmitting high frequency electrical signals from a coaxial transmission to a microstrip transmission line. The coupler is adapted to match the characteristic impedance of the two media and the electromagnetic field patterns of the two media at the interfaces therewith. The coupler provides a transition having a very low reflections at frequencies at least up to 18 GHz. The preferred embodiment transitions utilize a cylindrical outer conductor and an inner conductor which is centered relative the outer conductor at the coaxial end of the coupler and gradually shifted offcenter so that it is very near the outer conductor at the microstrip end of the coupler. The characteristic impedance of the coupler is maintained at a constant value by appropriate variation of the inner conductor. Other features are disclosed.

Abstract: A pentagonal prism for use in a viewfinder of a single lens reflex camera makes use of total reflection of viewfinder light flux at effective optical path regions on its pair of roof surfaces. The prism constitutes a module together with a protection cover attachable thereto for protection of the roof surfaces. The cover is provided with a pair of roof walls accomodated to the roof surfaces of the prism and including recessed portions corresponding to the effective optical path regions on the roof surfaces and peripheral portions corresponding to portions on the roof walls out of the effective optical path regions. Upon attachment of the cover to the prism, the peripheral portions contact the portions on the roof surfaces out of the effective optical path regions and an air space which ensures the total reflection is left between the inner surfaces of the recessed portions and the effective optical path regions on the roof surfaces.

Abstract: A collar for supporting and positioning a diffusion tube in a furnace used in the manufacture of semiconductors, integrated circuits and the like, is disclosed. The collar has a resilient core and an outer cover enclosing the core. The core and the cover are made of materials which readily withstand the normal operating temperatures of the furnace. The collar is dimensioned to tightly fit around a circumference of the diffusion tube, and to fit within an aperture provided in a support block of the furnace. The collar permits precise positioning of the diffusion tube relative to a helical heating coil provided in the furnace.

Abstract: A hand held, short range FM radar device is provided employing a unique tracking circuit and a predistortion circuit to linearize the sweep function to a Gunn oscillator which produces the rf signal. A parabolic generator comprising a linear operational amplifier and passive elements connected thereto is used to shape the saw tooth sweep signal to the Gunn oscillator.The output is directly read out on an LED display; an audio signal is also produced whose frequency is a function of target distance.

Abstract: A modified Gauss type lens system of 5-group, 6-element is disclosed, which lens system comprises first to third and fifth groups each consisting of a single lens element and a fourth group consisting of a doublet and fulfills the following conditions:2.8f<f.sub.1,2,3 <10f0.25<(d.sub.1 +d.sub.2 +d.sub.3 +d.sub.4 +d.sub.5)/.SIGMA.d<0.35(N.sub.1 +N.sub.2 +N.sub.5 +N.sub.6)/4>1.721.0<r.sub.6 /.vertline.r.sub.7 .vertline.<1.50.2f<.vertline.r.sub.7 .vertline.<0.35fN.sub.1, N.sub.2 >1.7130<.nu..sub.1, .nu..sub.2, .nu..sub.5, .nu..sub.6 <5628 <.nu..sub.3, .nu..sub.

Abstract: A key incorporating a miniature light source in a handle thereof, is disclosed. A key body member comprises a substantially elongated first portion and a second portion disposed in an angular relationship to the first portion. The handle of the key comprises a retainer member which incorporates a channel adapted for slidably receiving and retaining the second portion of the key body member. A locking member, comprising a part of the handle, is adapted for interfacing with the retainer member and for removable attachment thereto. A tab protruding from the locking member is disposed adjacent to an opening of the channel thereby locking the key body member into the assembled structure. A suitable cavity is provided within the handle member for operative mounting of a miniature power source, a miniature light bulb and a pressure actuated switch.

Abstract: A multiple game assembly that can be carried in a player's pocket is provided. A plurality of game boards are contained within the housing assembly and an exterior indicator can select any specific game. When the housing assembly is open the preselected game board is automatically positioned in an operative mode. Each game sheet includes a magnetizable substrate that is capable of retaining magnetic game pieces.

Abstract: A zoom lens barrel is constructed such that the axial movement and rotation of a single operation ring relative to a stationary barrel causes zooming and focusing respectively and provides a device for providing constant magnification photography. This is accomplished by a plurality of cam grooves provided on one of the operation ring and the stationary barrel and a guide pin provided on the other of the operation ring and the stationary barrel and releasably engageable with each of the cam grooves. Each of the cam grooves forces the operation ring to rotate upon axial movement of the operation ring through the engagement with the guide pin such that magnification remains constant during focusing. The magnification that remains constant during focusing varies depending on which of the cam grooves the guide pin is engaged with.

Abstract: A steering assembly particularly adapted for incorporation into a remote controlled toy car is disclosed. The steering assembly includes a pair of kingpins which fixedly mount two steered wheels of the toy car. The kingpins are pivotably mounted on axles attached to a chassis of the toy car. The kingpins are also moveable on their respective axles in a substantially vertical direction relative to the chassis of the toy car. A mechanism is provided to simultaneously pivot both kingpins about their respective axles in a proportional response to a steering input by a player so that the steered wheels of the cars are turned to a desired extent. Each kingpin is in an operative camming relationship with at least one member fixedly attached to the chassis of the toy car so that the kingpin located on the inside of a turn is caused to move downward and the other kingpin located on the outside of the turn is caused to move upward.

Abstract: A control device adapted for remotely controlling a plurality of moving appendages or functions of a toy or a small machine, is disclosed. The toy includes a drive motor which provides power to rotate a drive gear. A control gear is pivotably mounted within the toy. It is permanently meshed with the drive gear and is laterally displaceable relative thereto. A plurality of output gears are mounted in the toy in positions wherein the control gear is capable of selectively meshing with each output gear dependent upon the positioning of the control gear relative to the drive gear. Each output gear drives a different appendage or function of the toy. A control motor which is actuable at the option of a player through a suitable remote control device, is provided in the toy. The control motor rotates a cam which laterally moves a cam follower connecting piece.

Abstract: A building or structure having a substantially hemispherical form is disclosed. The building is assembled from a plurality of prefabricated structural elements or panel members and is well suited for providing living and storage space and the like. Each of the panel members has a substantially spherical exterior surface, a curvature of which is determined solely by the desired radius of the hemi-spherical building. The panel members are attached to one another in a partially overlapping configuration. Points of attachment of the panel members are arranged according to a predetermined geometrical pattern or configuration. The buildings or structures of the invention show surprisingly large structural integrity even though panel members of relatively small wall thickness are used.

Abstract: A remote controlled self-propelled toy vehicle is disclosed which is capable of moving on a solid support surface and also on water. Two motors and a power source are mounted to the hull of the toy vehicle. Each motor drives, through a suitable transmission assembly, a drive wheel and a screw propeller. The drive wheels are disposed to come into contact with the solid support surface for operation as a land going vehicle, and the screw propellers are disposed for submersion in water when the toy vehicle is operated as a boat.Steering of the vehicle is accomplished on the solid surface and also on water by varying the power output of the motors so that uneven power output of the two motors causes the vehicle to turn. A suitable, preferably radio signal emitting remote control system and associated circuitry is provided to allow a player to steer the vehicle from a remote location.