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Dual band night vision device

a night vision device and dual band technology, applied in the field of night vision devices, can solve the problems of reducing the sensitivity of the focusing assembly to tilt, rotation, or decentration

Inactive Publication Date: 2008-12-04
FLIR SURVEILLANCE
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  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a night vision device that allows for the simultaneous viewing of both visible light and infrared light images, with the two images appearing to originate from the same angle at the same time. The device includes a multispectral objective lens that transmits and focuses both visible / near infrared light and infrared light. The dichroic device separates the two types of light and directs them towards an infrared camera. The infrared camera is connected to a display that can be the same or separate from the image intensifying assembly. The device also includes an elastomer-restricted image intensifier mount that ensures the image remains in sharp focus. The technical effects of this invention include improved image quality, reduced parallax, and improved targeting accuracy."

Problems solved by technology

Use of a low diopter focus lens decreases the sensitivity of the focusing assembly to tilt, rotation, or decentration of the focus lens.

Method used

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Embodiment Construction

[0043]The present invention provides a night vision device capable of producing an intensified visible light image, an infrared image, or both images overlayed upon each other to appear as a single image.

[0044]Referring to FIG. 1, a night vision device 10 is illustrated, with the illustrated example being a night sight for a firearm. The night sight 10 includes a forward end 12 which faces the target in use, and the back end 14 through which a shooter or other user may view an image through the night vision device 10, possibly through a daytime telescopic sight. A housing 16 holds the components of the night vision device 10. A multispectral objective lens 18 is secured within the forward end 12. Preferred embodiments of the multispectral objective lens 18 are catadioptric lenses that include a central obscured area 20 surrounded by a usable area 22, but alternative layouts within the forward end 12 of the housing 16 permit the use of refractive objective lens elements. A multispect...

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Abstract

A night vision device provides both an amplified visible light image and an infrared image, overlayed upon each other so that they appear to be a single image. A user may select to utilize either an intensified visual image only, an infrared image only, or ratios of both images simultaneously. Dichroic surfaces within the night vision device are utilized first to separate light into visible and infrared portions, and then to recombine the visible and infrared images to a single image.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to night vision devices. More specifically, the present invention provides a night sight for use with a telescopic day sight, capable of providing imagery in the visible light and / or infrared wavelength bands.[0003]2. Description of the Related Art[0004]The use of a light source to illuminate the target—whether visible light or near-infrared—has the disadvantage of indicating the location of the shooter. Laser aiming devices carry the same disadvantage. Thermal infrared imaging, which does not require a light source, has the disadvantage of producing an unnatural image. Light gathering and intensifying night vision devices produce natural images, but are only useful to the extent that there is available light to gather light and intensify. The use of tritium illuminated sights, while making the sights more visible, fails to illuminate the target even if the tritium-illuminated aiming reticl...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02B23/12
CPCF41G1/32F41G1/38G02B23/12
Inventor POCHAPSKY, EUGENEKEITZER, SCOTT
Owner FLIR SURVEILLANCE
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