Other

Ole Gunst

Gary R Fisher

An exposure station and a film transport comprise apparatus for recording a series of strip holograms on a continuous length of non-perforated film. The apparatus includes a vacuum-platen for keeping the film stable during holographic recording and a film stepping mechanism for advancing the film in equal steps between successive exposures. The film stepping mechanism is operationally coupled to the vacuum-platen and includes a drive arm that grips the film during each advance and releases the film without backlash between successive film advances. The film stepping mechanism includes a single-acting vacuum cylinder for moving the drive arm. The apparatus does not introduce strain in the film during the transport process which could result in non-uniform demodulation of the successive strip holograms. The stepping increment (holographic strip width) is adjustable with accurate increments as small as 0.005' being obtainable. In the preferred embodiment, both film stepping mechanism and vacuum-platen assembly are driven by a single vacuum system. In another embodiment the film stepping mechanism includes a double-acting cylinder for moving the drive arm which can be activated by either fluid pressure or vacuum.

Holographic exposure station and film transport

An optical device comprising a pair of lenses mounted along a viewing axis within a housing and angularly adjustable relative to the viewing axis by a manipulator extending outside the housing. The manipulator comprises an exterior knob on a shaft extending through the housing and having a gear engaging corresponding sector gear portions of individual pivoted mounts supporting the respective lenses. A flexible, preferably elastic membrane, sealed to the respective lenses and extending therebetween, contains a fluid such as glycerine, having an index of refraction corresponding to the refractive index of the lens material. Adjustment of the manipulator knob jointly varies the angles of the respective lenses relative to the viewing axis and to each other so as to shift the direction of light transmitted through the device. The device is used by an individual in exercising eye muscles to correct a condition of squint, e.g., the cross-eyed condition not infrequently encountered in young children.

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Topanga, CA, United States of America

Ole Gunst