Optical cloaking system

• US 9,405,118 B1
• Filed: 12/14/2012
• Issued: 08/02/2016
• Est. Priority Date: 05/14/2012
• Status: Active Grant

• Current Assignee: Weimin Lu
• Original Assignee: Weimin Lu
• Inventors: Lu, Weimin
• Primary Examiner(s): Wilkes, Zachary
• Assistant Examiner(s): King, George G
• Application Number:
  US13/714,770
• Time in Patent Office: 1,327 Days
• Field of Search: 359/837
• US Class Current: 1/1
• CPC Class Codes: F41H 3/00 Camouflage, i.e. means or methods for concealment or disguise for vessels B63G8/34, B63G13/02 ; sound camouflage, i.e. simulating gun fire noise, F41A33/04; dummy or decoy targets F41J; chaff per se F41J2/00; ammunition for dispensing chaff F42B5/15, F42B12/70; radar absorbing fabrics H01Q17/005
• CPC Class Codes: G02B 13/0095 Relay lenses or rod lenses in instruments for viewing the inside of hollow bodies G02B23/2446
• CPC Class Codes: G02B 17/006 Systems in which light light is reflected on a plurality of parallel surfaces, e.g. louvre mirrors, total internal reflection [TIR] lenses Fresnel mirrors G02B5/09, Fresnel lenses G02B3/08
• CPC Class Codes: G02B 17/023 for extending or folding an optical path, e.g. delay lines
• CPC Class Codes: G02B 17/045 having static image erecting or reversing properties only optical derotators G02B27/642; optical devices for controlling the direction of light using movable or deformable optical elements G02B26/08
• CPC Class Codes: G02B 17/0844 off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
• CPC Class Codes: G02B 17/086 wherein the system is made of a single block of optical material, e.g. solid catadioptric systems
• CPC Class Codes: G02B 27/00 Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
• CPC Class Codes: G02B 27/0075 with means for altering, e.g. increasing, the depth of field or depth of focus
• CPC Class Codes: G02B 5/04 Prisms

Abstract

An optical cloaking system which optically cloaks/hides an object in the visible light spectrum such that the object appears invisible, while permitting a background behind the object to be viewed substantially without distortion. The system includes at least one optical device manufactured using common optical materials in the form of prisms, lenses, mirrors, and the like, which is placed between an observer an the object to be cloaked, and the optical device bends and/or compresses light such that the light passes around a cloaked space in which an object is disposed, and the observer viewing a larger space including the cloaked space will not see the object, but will see a background behind the object in full view substantially undistorted in relation to the rest of the larger space.

Claims

1. An optical cloaking system consisting of:

a first optical device which is transparent and formed entirely of material with a positive refractive index; and

a second optical device which is transparent and formed entirely of material with a positive refractive index, wherein

the first and second optical devices have a same shape, are configured to be disposed symmetrically to each other on opposite sides of an adjacent object to be cloaked, and which jointly create a cloaked object cavity between the optical devices encompassing the adjacent object from the viewpoint of an observer positioned with either of the optical devices between the observer and the object,

the first optical device comprises a first portion which compresses and bends, only by refraction in substantially only one direction, light rays entering the first portion at a predetermined angle to a direction at which the light enters the first portion, and passes the compressed and bent light, and a second portion which receives the compressed and bent light rays which are passed from the first portion, which further alters a size ratio of and bends the received light rays only by refraction in substantially the same direction as the first portion, and which emits the further altered and bent light rays in a direction substantially parallel to the direction at which the light rays enter the first portion,

the second optical device comprises a third portion which receives the further altered and bent light rays which are emitted from the second portion, alters a size ratio of and bends the received light rays only by refraction in a manner opposite to the second portion, and passes the light rays, and a fourth portion which receives the light rays passed from the third portion, bends and decompresses the light rays only by refraction in a manner opposite to the first portion, and emits the light rays with a size ratio and directivity the same as the light rays which enter the first portion,

said first and second optical devices are movable relative to each other so that a size of the cloaked object cavity is variable based on a distance between the first and second optical devices.

2. An optical cloaking system according to claim 1, wherein a bottom surface of each of the first and second optical devices is flat.

3. An optical cloaking system according to claim 1, wherein each of the first and second optical devices is a self-supporting member such that an observer can view a background behind each of the first and second optical devices without any obstruction and seamlessly right up to the outer peripheral edges each of the first and second optical devices.

4. An optical cloaking system according to claim 1, wherein each of said optical devices is a continuous molded member or a continuous extruded member.

5. An optical cloaking system according to claim 1, wherein the second portion of the first optical device emits the further altered and bent light rays such that they pass through a space adjacent one face of the cloaked object cavity, said space having a size less than one half of a size of the cloaked object cavity.