A crystal structure arrangement used in a spatial light modulator wherein an electrooptic crystal structure faces an electron beam source, such as a photocathode or an electron gun, within a vacuum envelope. Electrons emitted from the electron beam source in response to an image or image signal source are stored on the surface of the electrooptic crystal structure to form a charge image thereon and then to change the refractive index of the electrooptic crystal structure corresponding to the sto...

A spatial frequency filter is adapted to an image sensor having a two-dimensional spatial frequency plane whose first quadrant includes a first prescribed point, whose second quadrant includes a second prescribed point, whose third quadrant includes a third prescribed point and whose fourth quadrant includes a fourth prescribed point. The two-dimensional spatial frequency plane has a vertical axis and a horizontal axis. The spatial frequency filter includes the combination of a primary filter pa...

A blazed output for a grating or filter is obtained by writing the real part of a complex function on a first portion of a recording medium and the imaginary part on a second portion of the recording medium, and introducing a phase shift between the first portion and second portion. A spatial light modulator, such as a magneto optic spatial light modulator (MOSLM) is preferably divided along the diagonal bisector of the MOSLM. The Fourier transform of the input function is taken and the cosine t...

Apparatus and a related method for generating a uniphase reference beam from a weak and aberrated input probe beam in an optical system. A portion of the input probe beam is split off and injected into the cavity of a laser, such as a semiconductor diode laser, where four-wave mixing takes place and an amplified input wave or its phase conjugate is output. Because the laser cavity is selected to provide single-mode operation, the laser provides not only amplification but an output that includes ...

A three-dimensional spatial input apparatus including a series of coplanar, single axis accelerometers configured to provide information on translation along and rotation around a set of orthogonal axes. A preprocessing computer determines the acceleration values output by the accelerometers and converts these values into a series of acceleration, velocity and position values in relation to the axis system, with corrections based on a change in the influence of gravity on the device as it rotate...

A transplanter machine rotates seedling plants from a horizontal file to a vertical orientation by use of a plant holder which has a dwell when in a loading position. The plant holder will accelerate the seedling plants from a relatively low velocity to a velocity that is matched to the machine travel speed such that the plant is inserted into the ground at a zero velocity relative to the ground. The plant holders are mounted upon holder arms which are pivotably connected to a rotating hub. Each...

A reticular spatial structure comprising a plurality of perimetral rod-like elements which are associable, at their ends, with perimetral nodes; a plurality of variable-length rod-like elements hinged to connecting nodes having a spherical contact surface adapted to allow the rotation of at least part of the variable-length rod-like elements both about the axis of said elements and with respect to the geometrical center of the various nodes, for the extension of the variable-length elements duri...

An asynchronous multi-stable state circuit particularly adapted for use in a shift register. The bits move through the stages asynchronously. Each stage is capable of storing a 1, 0 or .phi. bit and has three control states; quiescent, set and clear. When a given stage is in the quiescent state a clear signal from a succeeding stage will cause the given stage to store or register a bit .phi. therein. This effectively puts the stage in a waiting condition. When this occurs, the control state swit...

An article transfer apparatus and method is provided wherein a plurality of article pickup heads mounted on a movable support means is operative to pick up a plurality of spaced articles at a transfer station and move the articles to an output area while the array of articles is being compacted or spread, as desired. The adjustment of the space between the articles is accomplished by making the pickup heads in the form of collapsible suction cups with anti-collapse stiffening means on one side o...

An apparatus for visibly indicating a spatial plane is disclosed, including a light emitter for generating a beam of light, means for dividing said beam of light into a pair of light beams, and means for scanning that pair of light beams in a pair of planes, wherein the planes in which the light beams are scanned are adjacent, symmetrical, and on either side of the spatial plane which is to be indicated. Specifically, the light emitter is a laser, and the means for scanning the pair of light bea...