The invention relates to a viewing instrument wherein the image being viewed by the user may be frozen owing to the provision of a memory function. In connection with the freezing of the image, the latter may be magnified in such a manner that a highly magnified image may be viewed without such discomfort as is due to shaking movements of the image while the user may perform a wide-angle-of-vision search for an image to be magnified.

Viewing apparatus for precisely locating and viewing a specific feature or area of the body, particularly in a hard-to-view area. The apparatus includes a viewing device, a general illumination device and a light beam pointer device. The viewing device may be a mirror and/or a camera with monitor. The viewing device is mountable on a freestanding support stand that provides a means for maneuvering the viewing device into a desired position and holding it in that position without the viewing devi...

A reference plate is situated on an optical axis of an eyepiece. The reference plate includes a first glass plate and a second glass plate. One surface of the first glass plate and one surface of the second glass plate are bonded. Cross hairs are formed on the bonded surface of the first glass plate by using a chromium plating and so on. A radius of curvature of the bonded surface accords with the field curvature of the sagittal image surface of the eyepiece.

A viewing system such as a panoramic sight for a tank, adapted for operation in both the visible and infra-red wavebands, comprising at least one common optical component which is receptive to both types of radiation and a means for subsequently separating the visible and infra-red radiation before reaching direct viewing and indirect viewing apparatus.

Viewing apparatus for providing a viewer with an apparent 3-D image includes a diffusing holographic optical element screen, horizontal strip lamps for illuminating the screen from a plurality of different positions and a liquid crystal display for effecting spatial modulation of the light from the respective positions so as to illuminate respective images on the screen. The arrangement is such as to provide a plurality of viewing zones whereby each image can be seen only from a corresponding on...

At least two television reception tuners are used in a viewing center system, one for the television signals and the other for supplementary information transmitted during the blanking intervals and separated in the reception center by a data separation stage. A programmable control stage including a microprocessor accepts information not only from the data separator, but also from a manual remote control input device and from a timing control stage. A signal source switching unit for both the a...

An improved optical projection viewing system is provided with a novel wide projection angle relay projection lens and a novel magnifying biocular viewing lens. The magnifying biocular viewing lens has non-symmetric front and rear biconvex surfaces having a uniform field distance when viewing the entire image on the viewing screen. The biocular viewing lens has positive distortion and color separation which is compensated for by negative distortion and color separation provided in the relay proj...

An apparatus for viewing and measuring using a partially reflective grating superimposed with the object. The invention provides efficient separation of viewing and measurement spectra from a common axis for a clear view of the object in conjunction with an accurate interferometric measuring system.

A portable apparatus for simultaneously viewing a transparency and a reflection copy image. The apparatus preferably complies with American National Standard Institute standards "Direct Viewing of Photographic Color Transparencies" and "Viewing Conditions for the Appraisal of Color Quality and Color Uniformity in the Graphic Arts." The apparatus includes a case which opens to have a cover portion positioned approximately horizontally near the top of an approximately vertical body portion. Pivota...

An underwater viewing device in the form of a generally rectangular, open topped, one-piece, transparent container having a flexible pad at the open top for the face of the user, ventilation openings formed through the upper front and rear walls of the device, and a pair of handles in the form of squeezable bulbs attached to tubing lengths extended into the forward, bottom area of the container. Periodic squeezing of the handles causes air to be drawn through the front vent, circulated to the re...