An image-stabilized optical device comprising, from front to rear, a first lens group of negative power, a second lens group of positive power and a rear lens group of positive power for forming an image, wherein the second lens group rotates around a point which is on the optical axis away from its rear principal point rearward by a distance of about .beta.2.multidot.f1/(1-.beta.2) where .beta.2 is the image magnification of the second lens group and f1 is the focal length of the first lens gro...

An improved mounting for a rotating diffraction grating assembly as used in a spectrophotometer directly connects the grating to the galvanometer that rotates the grating. The galvanometer is gimbally mounted on a plate so that its position, and that of the grating, can be adjusted so that the plane of dispersion of the grating passes through a desired point when the grating is rotated.

The fabrication and structure of a hermetically sealed, environmentally-sensitive, thin film coating between two planar transmitting substrates is disclosed. The edges of the substrates are metallized to allow solder to wet and form a vapor barrier. Two such substrates are assembled with an O-ring spacer or an epoxy/glue spacer and the assembly is then soldered to a protective ring using a benign low temperature indium based solder. Fluxes from the soldering step are separated from the coating b...

A sample filter holder for use with a microscope for holding the filter in a planar condition on the stage of the microscope so that automatic focusing of the microscope can be performed on particle samples dispersed on the filter. The holder includes a base having a well communicating with an inlet port which is connected to a suction pump. A screen assembly is positioned within the well. The screen assembly includes a disk having a screen positioned on its top surface and secured to the disk a...

A rearview mirror for a motor vehicle. A mirror body is adjustably disposed in a housing that is pivotable about a vertical axis. Longitudinally shiftable adjustment elements are provided for the remote adjustment of the mirror body. So that this mirror can be tilted for safety reasons, the adjustment elements, in the vicinity of the interface between the housing and the base for the housing, are respectively provided with coupling halves for a pull and compression-resistant connection.

An optical window is disclosed for association with a scanning face of a laser scanner wherein a laser beam is projected through the window to define a scanning pattern and the optical window is supported such that at least one surface of the window is angularly oriented relative to the scanning face to improve the incidence angles of the laser beam on the window and/or the refractive angles of the laser beam at the window. Preferably, the window comprises a composite block of optical material h...

An optical bypass switch receives arbitrarily polarized light from an input optical fiber which is divided into the P and S-polarized light beams by a polarization beamsplitter. These P and S-polarized light beams are focussed to a magneto-optic garnet wherein the plane of polarization is rotated in accordance with a desired switching function and directed to an output optical fiber determined by the polarization rotation state established in the magneto-optic garnet.

A material has a reflective surface which bears a light diffracting pattern in the form of a series of well-defined grooves and ridges, wherein the transverse cross-section of the surface has a non-cyclical sequence of peaks and troughs. The pattern is produced by a method involving the interference of a first reference beam of coherent light with a second beam of coherent light, the second beam consisting of a bundle of divergent beams all of which illuminate the same area as the first beam. Ap...

The invention contemplates a stereoscopic binocular surgical microscope wherein a principal objective of defined focal length is rigidly attached to the microscope and serves both observation-ray paths; an additional lens system is swingably positionable in and out of the ray paths for quick change of focal length, without changing the principal objective, and the additional lens system has provision for selective small radial adjustment of the axis of the additional lens system with respect to ...

In order to improve the angle of sight and the light intensity of the light markings of keys on a keyboard, the keys are provided with a light conducting body arranged over the individual light sources of the individual light sources of the individual keys. This semi-conducting body preferably has the form of a truncated wedge whose truncated top face substantially coincides with the key top face and the bottom directed towards the light source is composed of no less than two facets of which the...