Abstract: The method and system focuses a projected image with a multiple rotationally symmetric aspheric surfaces and an ellipsoidal reflector-relay onto or in a user's eye. The image is projected from the first elliptical foci and is focused on the eye at the second foci. A peripherally mounted outboard projector unit uses three lenses and a substantially flat projector surface. Alternatively, an inboard mounted projector unit uses two lenses with non-rotationally symmetric aspheric surfaces and a biconic projector surface (organic light emitting diode (OLED) or curved silicon). The image projector-lens system and the ellipsoid pupil relay are correctly positioned on the head of the user by a head mount system which may be goggles, eye glasses worn by the user, or screens or shields depending from a head piece or helmet worn by the user.

Abstract: A three mirror anastigmatic optic (and corresponding method of making) comprising a primary mirror, a secondary mirror, a tertiary mirror, and a vertex common to the primary and tertiary mirrors.

Abstract: A multi-channel acousto-optic spectrometer employs a multi-channel Bragg cell, Fourier transform imaging optics and two-dimensional charge coupled device photodetector array to simultaneously process a plurality of parallel channels of respectively adjacent frequency bands of a wideband radio frequency signal. The signal modulation and optical transmission characteristics of the spectrometer are such that the respective acousto-optic channels to which the respective sub-bands portions of the signal are applied do not interfere with one another and are imaged upon closely spaced regions of the two-dimensional photodetector array.

Abstract: In accordance with the present invention there is provided a hydraulic drive assembly including a driven member having a hydraulic pump located therein for selectively circulating liquids within the driven member, a drive shaft connected to the driven member for turning the drive shaft of the hydraulic pump, and a control member for selectively varying the flow of fluids from the pump.