Abstract: An objective lens (20) and an optical scanning device (30, 20, 50) provided with such a lens are described, of which lens both surfaces (22, 23), viewed from the object side, are concave, while the focal length is considerably smaller than its thickness (d) of along the axis and the surface (23) at the image side is aspherical. When using this objective lens, the scanning device may be very compact.

Abstract: A soft focus lens comprising a lens for softening arranged to axially move to selectively change the soft focus effect, a lens for focus adjustment arranged to axially move to adjust the focus, a driver for moving the lens for focus adjustment, a selector device for moving the lens for softening to select axial positions and a computing circuit for computing the amount of movement of the lens for focus adjustment to cancel the shift of the focal point resulting from the movement of the lens for softening and producing an output to the driver.

Abstract: Herein disclosed is a parallel beam shaping optical system which is an afocal anamorphic optical system. The optical system comprises two prisms for shaping a bundle of beams in a desired direction. The optical system is constructed so that an incident light is in parallel to the emergent light. Two shaping optical sub-systems each composed of the above-described optical system may be combined with each other to obtain a desired shaping of a ray of light.

Abstract: Optical systems for use with attachments for a conventional reflex motion picture camera to permit stereographic cinematography are disclosed. The optical systems include lens systems having four powered elements having negative, positive, negative, and positive focal lengths respectively. The lens systems are adapted to be used with the Bernier stereographic cinematography attachment system as modified for reflex motion cameras. The lens systems include a normal lens system, a wide angle lens system, and a telephoto lens system. The wide angle lens system further includes plane parallel refractive elements to increase its overall length without changing its back focal length, and the telephoto lens system is adapted to be used with internal displacement prisms which bring the images produced by the telephoto lens system into the camera flange opening.

Abstract: An objective lens comprising five lens elements and intended for use in an optical recording system wherein a laser beam is focused onto a recording surface located beneath a plastic layer over the disc. The disclosed lens has a relatively large numeric aperture of 0.75, but has a relatively large working distance between the lens and the disc and a relatively low total mass, to facilitate rapid movement of the lens. In addition, the lens is color corrected to accommodate a range of spectral frequencies present in the laser beam.

Abstract: A system for generating pulses of laser radiation which vary in frequency with time to achieve a chirp or frequency sweep in which single or multiple laser spectra in the form of mode lines are displaced or shifted in frequency during the generation of the laser pulse. The system provides for the mode line shift through the use of an optical wedge which moves tranversely through one of the optical paths utilized in the optical loop to generate the laser pulse. This provides a linear increase with time in the optical path length so as to perturb the wavelength of oscillation of the laser output, which results in a linear chirp. In a preferred embodiment a number of prisms of optically dense material with a wedge-like profile are mounted on a rotating disc. When the disc with the prisms is interposed in the optical loop of an injection locked laser oscillator, successive prisms traverse the laser's optical loop.