Showing papers on "Binoculars published in 1989"
Patent•
5 Oct 1989
TL;DR: In this paper, four prism pairs are arranged in two mirror symmetrical housing halves joined by a pivot axis to provide focussing for both eyepieces, and four prisms are rotatable through small angles above axes parallel to the base centre line.
Abstract: Each barrel has a lens and ocular lens systems with prism pairs lying between them, half overlapping and mutually perpendicularly offset w.r.t their base centre line. The prisms are arranged in two mirror symmetrical housing halves joined by a pivot axis to provide focussing for both eyepieces. All four prisms are rotatable through small angles above axes parallel to the base centre line. They are driven by control elements controlled by angular acceleration sensors detecting hand-held housing disturbances. ADVANTAGE - Adjustments can be made whilst maintaining acquired image in view using high magnification binoculars.
15 citations
Patent•
30 Jun 1989
TL;DR: In this paper, a focal-length adjusting assembly for a pair of binoculars which adjusts the eyepieces relative to the optics and which can hold the adjusting screw or rod in a click-stopped position is presented.
Abstract: The present invention relates to a focal-length adjusting assembly for a pair of binoculars which adjusts the eyepieces relative to the optics and which can hold the adjusting screw or rod in a click-stopped position which automatically positions the eyepieces in a position for viewing an object at an infinite distance.
7 citations
Patent•
[...]
6 Dec 1989
TL;DR: In this article, the authors proposed a utility model for watching large screen TV, wide screen TV and stereoscopic TV, where a concave and convex cylinder lens with different longitudinal and horizontal magnifying power are separately used as an eye lens and objective lens assembly.
Abstract: The utility model discloses a telescopic type sight glasses for TV which alters the limitation of general binoculars that the optical axles of two lens barrels of general binocular are parallel, and eye lens and objective lens are separately made of a concave spherical mirror and a convex spherical mirror, and only distant scenery can be watched through the general binocular. The utility model adopts a visual angle adjusting mechanism to make the optic axial angle of the two lens barrels adjustable. The utility model has miscellaneous functions of watching large screen televisions, wide screen televisions and stereoscopic televisions, because a concave and convex spherical lens are separately used as an eye lens and objective lens assembly, and a concave convex cylinder lens with different longitudinal and horizontal magnifying power are separately used as an eye lens and objective lens assembly.
6 citations
22 Dec 1989
TL;DR: In failing light, binocul are used to detect objects that the naked eye cannot detect as discussed by the authors, and this application is primarily of interest in military fire control; however, it is not suitable for use in outdoor applications.
Abstract: A binocular extends the range of human vision. Binoculars enable the user to see objects at greater distances or, alternatively, to see greater detail in distant objects. In failing light, binocul are used to detect objects that the naked eye cannot detect. Binoculars also extend the range of stereo vision of the user; this application is primarily of interest in military fire control.
4 citations
TL;DR: This chapter discusses the component of the basic optical systems, and the performance of the individual components is explained to help the reader to select the appropriate type of lens to use in a laboratory setup for trying out as a prototype of a new instrument.
Abstract: Publisher Summary This chapter discusses the component of the basic optical systems. The performance of the individual components is explained to help the reader to select the appropriate type of lens to use in a laboratory setup for trying out as a prototype of a new instrument. Most of the designs shown were designed for a particular requirement, so any change of it may require a new optimized design. However, some requirements are not lens-limited so they may be usable as they are. A good example of a terrestrial telescope is the optics in a pair of prism binoculars. The optics found in binoculars has been made in large numbers, and many shops have the capability of making this kind of optics. Surplus lenses can be found at reasonable prices. Eyepieces with apparent fields up to 45° have been made using an aspheric surface. The aspheric surface is used mainly to correct the spherical aberration in the position of the exit pupil. The projection lenses and condensers is discussed. The chapter discusses the lens systems for laser systems.