A device for measuring the magnitude of displacements with the aid of gratings having a real image optical system whose magnification is one with a reflection optical system adapted to reflect a light incident on a grating plane and project the light again on the same grating plane in a direction which is the same as that of the incident light to produce a moire fringe whose strength varies in response to the displacement of the grating. The moire fringe thus produced is observed to measure the ...

A wide angle camera lens system of retrofocus type comprising a forward lens system having a negative refractive power and consisting of first and second lens elements and a master lens system having positive refractive power and consisting of third and fourth lens elements and a backward lens system having positive refractive power and consisting fifth, sixth and seventh lens elements and giving negative refractive power to an air lens formed between the third and fourth lens elements in the ma...

This apparatus uses one or more drums each having a number of small holes or convex lenses for converting a light ray emitted from a light source into light spots each having a small diameter. The light spots are projected onto a scanning raster region through which moves a picture film. A light passed through the film is converted into an electrical signal adapted to be supplied to a conventional television receiver.

An accurate lens system for producing an extremely small image in a reduced scale, which is constructed as 6 components and 8 lenses and consists of first and second components of positive meniscus lenses, each component consisting of a single lens, third and fourth components of negative lenses, each component consisting of two lenses made integral into a unit lens, and fifth and sixth components of positive lenses, each component consisting of a single lens, all lenses being arranged in succes...

A mirror drum optical system for use in a microscopic spectrophotometer has a system of a lens and mirrors adapted to be inserted into and retracted from the optical path. A camera is arranged to photograph the specimen and the centering of the pinholes and reflex viewing system and photoindicator permit sequential observation and measurement by an observer.

An accelerometer for providing direct measurement of the velocity of the head of a golf club by attaching to the shaft of the golf club the accelerometer comprising an inertia mass in its chassis supported by spring means for movement relative to and parallel to the gold club shaft when the club is swung. The deviation of the inertia mass is indicated by an indicating means able to give a stational and definite indication.

A planapochromatic objective lens system for use in microscopes, which is constructed as two groups and six lenses and in which a first group of lenses comprises a first negative meniscus lens that has at its object side a concave surface, and a second positive lens slightly air spaced from the first meniscus lens, and a second group of lenses is separated from the first group of lenses by a long air space and comprises a compound lens including third, fourth and fifth lenses, the fourth lens sa...

An objective lens system having a large work distance and adapted for use in microscopes, which is constructed as seven components and nine lenses and consists of a first component of convex meniscus lens that has at its object side a concave surface, second and third components of convex lenses, a fourth component of composite convex lens, a fifth component of composite meniscus lens that has at its image side a deep concave surface, a sixth component of meniscus lens that has at its object sid...

A lens system having a long focal length, which consists of a first positive lens component, a second positive meniscus lens component that has at its object side a convex surface, a third negative lens component, a fourth negative lens component and a fifth positive lens component, large air spaces being present between the third component lens and the fourth component lens and between the fourth lens components and the fifth lens components, respectively, and which is defined by the following ...

A super telephoto lens system having a small telephoto ratio, which comprises front lens components consisting of a biconvex lens element, biconcave lens element and positive compound meniscus lens component, and a rear lens component spaced apart from said front lens components by a large air space inclusive of an iris diaphragm and consisting of a negative compound meniscus lens component, all lens elements being arranged in succession from the side of an object, and which is defined by the fo...