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Collimator sight
A collimator sight is a type of optical sight that allows the user looking into it to see an illuminated aiming point aligned with the device the sight is attached-to regardless of eye position (with little parallax).〔(Elementary optics and application to fire control instruments By United States. Dept. of the Army, section 8-24 )〕 Collimator sights are 'blind' sights; that is, they are used with both eyes open while one looks into the sight, with one eye open and moving the head to alternately see the sight and then at the target, or using one eye to partially see the sight and target at the same time.〔( Elementary optics and applications to fire control instruments: May, 1921 By United States. Army. Ordnance Dept, page 84 )〕 Collimator sights are a relatively old idea,〔Surveillance and target acquisition systems A. L. Rodgers - 1983 – page 201〕 being used in many forms for almost 100 years.〔(America's munitions 1917-1918: Report of Benedict Crowell, THE ASSISTANT SECRETARY OF DIRECTOR OF MUNITIONS , United States. War Dept - 1919 - Page 142 )〕 They are also referred to as collimating sights 〔William C Farmer, Ordnance field guide, page 279〕 or "occluded eye gunsight" (OEG).〔Jan Kay, International Defense Directory, 1991-92, page 241〕
==Description==
The basic layout of a collimator sight is a closed tube with a lens at its open end and a luminous reticle mounted near the closed end at the focus of the lens, creating an optical collimator. The reticle is illuminated by an electronic light source (an incandescent light bulb or, more recently, a light-emitting diode) or by ambient light gathered behind the reticle via an opalescent window or fiber optic light pipe.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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