Prismatic Eyepiece Attachment for Telescopic Gun Sights

a technology of eyepiece and telescopic sights, which is applied in the field of telescopic gun sights, can solve the problems of comb spoiling the natural lines of rifle stock, unsuitable rifle for use with open sights, and the need for two separate eye positions for telescopic sight and reflector sigh

Inactive Publication Date: 2016-12-08
LUCIDA RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Enables shooters to maintain a proper cheek weld and achieve high aiming accuracy by allowing the use of telescopic sights with improved ergonomics, eliminating the need for raised rifle stocks and reducing the need for separate eye positions when switching between telescopic and reflector sights.

Problems solved by technology

However, a raised comb spoils the natural lines of the rifle stock.
A raised comb also make the rifle unsuitable for use with open sights.
A major drawback of the configuration shown in FIG. 1(b) is that the telescopic sight and the reflector sight require two separate eye positions.

Method used

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  • Prismatic Eyepiece Attachment for Telescopic Gun Sights
  • Prismatic Eyepiece Attachment for Telescopic Gun Sights
  • Prismatic Eyepiece Attachment for Telescopic Gun Sights

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

A. Principle of Operation

[0018]It is well-known that a wedge prism would deviate the direction of a monochromatic beam of light by α degrees where

α=θ−ξ+sin−1(√{square root over (n2−sin2 θ)}×sin ξ−sin θ cos ξ).  (1)

[0019]In the above formula α is the beam deviation angle, ξ the apex angle of the prism, θ is the incidence angle of the incoming beam and n is the index of refraction of the glass material used for making the prism. This notation is shown in FIG. 2(a).

[0020]For a wedge prism with small apex angle ξ and when the incidence angle θ is not too steep, (1) is simplified as

α≈(n−1)ξ.  (2)

[0021]When a wedge prism is used to bend the path of a collimated (parallel) polychromatic light beam, the only major abberation introduced is chromatic change in the beam deviation angle. This abberation can be corrected by using an achromatic prism. An achromatic prism is made by combining two or more prisms of different refractive index as shown in FIG. 2(b). The component prisms are so design...

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Abstract

An attachment device that shifts the exit pupil position of a telescopic gun sight is introduced. The attachment includes a refracting wedge prism to tilt the viewing axis of the telescopic sight. This, in turn, shifts the position of the exit pupil of the telescopic sight and makes it possible to view the target image from an eye position offset from the sight's optical axis. The invention provides improved ergonomics for the shooter.

Description

I. CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional application of my co-pending application Ser. No. 14,732,524, filed on Jun. 5, 2015. A new figure (FIG. 4) has been added to better illustrate the invention in perspective view. All the features of the invention described or shown in the present application have been previously disclosed in the specifications or the drawings of the parent application. No new matter has been added.II. FIELD OF THE INVENTION[0002]This application is in the field of telescopic gun sights used on small arms. Specifically, it describes an attachment which can be connected to the eyepiece side of a telescopic gun sight to move its eyepoint to a more comfortable position. The shooter can maintain a proper cheek weld on the weapon stock, as taught in small weapon training for achieving high accuracy of target hits.III. BACKGROUND OF THE INVENTION[0003]Telescopic gun sights also called riflescopes are widely used to assist aimin...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F41G11/00G02B26/08F41G1/38
CPCF41G11/00G02B26/0891F41G1/38G02B23/02G02B25/001G02B27/32
InventorJAHROMI, OMID S.
OwnerLUCIDA RES