System and method for binary focus in night vision devices

Active Publication Date: 2014-06-05
ELBIT SYSTEMS OF AMERICA LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a focusing device for a night vision optical device that can automatically focus on a target at a certain distance. This is achieved by detecting the orientation of the device and moving the lens assembly accordingly to either focus on the target or the surrounding environment. The device can also be used in a night vision optical device that has a built-in sensor to detect its orientation, making it easier to focus on the target without having to manually adjust the focus. The technical effect of this invention is that it provides a more efficient and effective way to focus on a target in a night vision optical device, without the need for manual adjustment.

Problems solved by technology

In addition, the weight of existing autofocus devices, in particular, the weight of the electro-mechanical driver and battery components, tends to reduce the mobility of the observer.

Method used

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  • System and method for binary focus in night vision devices
  • System and method for binary focus in night vision devices
  • System and method for binary focus in night vision devices

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Embodiment Construction

[0025]The invention will next be illustrated with reference to the figures. Such figures are intended to be illustrative rather than limiting and are included herewith to facilitate explanation of the present invention. The figures are not to scale, and are not intended to serve as engineering drawings.

[0026]Referring to FIG. 1, a block diagram illustrating a position of a focal plane (FP) FP1 (or FP2) relative to objective lens 102 for object 104 (or object 104′) at different distances from the objective lens. Objective lens 102 represents a general objective lens, and may include one or more optical lens elements. In general, objective lens 102 passes light rays 106 (or light rays 108) from object 104 (or object 104′) and produces light rays 106′ (or light rays 108′) that converge onto FP1. (or FP2). The focal plane represents the position of the focused image of an object. Typically, the focal plane represents the position of an imaging device (not shown), such as a CCD detector,...

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Abstract

Focusing devices and methods for controlling a focal position of an objective lens assembly in a night vision optical device are provided. The focusing device includes an objective lens assembly positioned at a first or second focus position from an imaging device and a binary focus controller, coupled to the objective lens assembly, configured to translate the objective lens assembly relative to the imaging device to either the first or second focus position. The objective lens assembly is translated to either the first or second focus position in response to an orientation of the night vision optical device.

Description

FIELD OF INVENTION[0001]The present invention relates to a binary focus mechanism for use with an optical device, particularly suited for night vision goggle applications.BACKGROUND OF THE INVENTION[0002]Night vision systems are used in a wide variety of military, industrial and residential applications to enable sight in a dark environment. For example, night vision systems are utilized by military aviators during nighttime flights or military soldiers patrolling the ground. As another example, security cameras use night vision systems to monitor dark areas.[0003]Conventional image intensified night vision equipment utilize an image intensifier (I2) to amplify a low light level (LL) scene. The image intensifier collects tiny amounts of light in a dark environment, including the lower portion of the infrared light spectrum, that are present in the environment but may be imperceptible to the human eye. The image intensifier amplifies the light so that the human eye can perceive the i...

Claims

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Application Information

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IPC IPC(8): G02B7/09
CPCG02B7/08G02B23/125G02B7/287G02B7/105G02B21/088G02B7/09G02B7/28G02B23/00
InventorDOBBIE, BLAIR REUBEN
OwnerELBIT SYSTEMS OF AMERICA LLC