초록 ▼

An optical rotator such as a Pechan rotator is arranged to rotate an image about a given axis. Light entering an input surface of the rotator is subjected to a number (e.g. five) of reflections, alternate reflections being total internal reflections and the intervening ones being mirror reflections.

An optical rotator such as a Pechan rotator is arranged to rotate an image about a given axis. Light entering an input surface of the rotator is subjected to a number (e.g. five) of reflections, alternate reflections being total internal reflections and the intervening ones being mirror reflections. At least one of the surfaces, preferably one at which total internal reflection occurs, bears a layered polarizing material arranged to impart a defined polarization effect as between light entering and exiting the rotator.

대표청구항 ▼

An optical image rotating device comprising an input surface, a plurality of reflective surfaces for reflecting light entering the device through said input surface, at least one of said reflective surfaces bearing a layered polarising material, and the device also comprising an output surface, the

An optical image rotating device comprising an input surface, a plurality of reflective surfaces for reflecting light entering the device through said input surface, at least one of said reflective surfaces bearing a layered polarising material, and the device also comprising an output surface, the layered polarising material being arranged to impose a predetermined polarisation effect between light entering the device at said input surface and leaving the device at said output surface, the device being rotatable, the optical axes of the input and output beams being parallel with the axis of rotation of the device.