Cloaking devices constructed from reflection boundaries and color filters and vehicles comprising the same

Patent metadata

Field	Value
Publication number	US-10688930-B2
Application number	US-201815883875-A
Country	US
Kind code	B2
Filing date	Jan 30, 2018
Priority date	Jan 30, 2018
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

A cloaking device includes an object-side, an image-side, a cloaked region (CR) between the object-side and the image-side. An object-side CR reflection boundary and a plurality of object-side color filters are positioned on the object side and an image-side CR reflection boundary and a plurality of image-side color filters are positioned on the image-side. The plurality of object-side color filters are spaced apart from and positioned generally parallel to the object-side CR reflection boundary, and the plurality of image-side color filters are spaced apart from and positioned generally parallel to the image-side CR reflection boundary. The plurality of object-side color filters and the plurality of image-side color filters may be co-planar and light from an object located on the object-side of the cloaking device propagates via at least two optical paths to form an image of the object on the image-side of the cloaking device.

First claim

What is claimed is:

1. A cloaking device comprising:
an object-side, an image-side, a reference optical axis extending from the object-side to the image-side, a bisecting axis extending between the object-side and the image-side, and a cloaked region (CR) between the object-side and the image-side;
an object-side CR reflection boundary and a plurality of object-side color filters spaced apart from and positioned generally parallel to the object-side CR reflection boundary; and
an image-side CR reflection boundary and a plurality of image-side color filters spaced apart from and positioned generally parallel to the image-side CR reflection boundary;
wherein light from an object located on the object-side of the cloaking device and obscured by the CR propagates via at least two optical paths to form an image of the object on the image-side of the cloaking device such that the light from the object appears to pass through the CR.

2. The cloaking device of claim 1 , wherein:
each of the plurality of object-side color filters and each of the plurality of image-side color filters comprise a cut-off wavelength; and
the plurality of object-side color filters and the plurality of image-side color filters are sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis.

3. The cloaking device of claim 1 , wherein the plurality of object-side color filters comprise a plurality object-side long-pass color filters and the plurality of image-side color filters comprise a plurality of image-side long-pass color filters.

4. The cloaking device of claim 1 , wherein:
the plurality of object-side color filters comprise a plurality of object-side long-pass color filters sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis with increasing short cut-off wavelengths from the reference optical axis to the bisecting axis; and
the plurality of image-side color filters comprise a plurality of image-side long-pass color filters sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis with increasing short cut-off wavelengths from the reference optical axis to the bisecting axis.

5. The cloaking device of claim 1 , wherein the plurality of object-side color filters comprise a plurality of object-side short-pass color filters and the plurality of image-side color filters comprise a plurality of image-side long-pass color filters.

6. The cloaking device of claim 1 , wherein:
the plurality of object-side color filters comprise a plurality of object-side short-pass color filters sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis with decreasing long cut-off wavelengths from the reference optical axis to the bisecting axis; and
the plurality of image-side color filters comprise a plurality of image-side short-pass color filters sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis with decreasing long cut-off wavelengths from the reference optical axis to the bisecting axis.

7. The cloaking device of claim 1 , wherein the plurality of object-side color filters are co-planar and the plurality of image-side color filters are co-planar.

8. A cloaking device assembly comprising:
an object-side, an image-side, a cloaked region (CR) between the object-side and the image-side, a reference optical axis extending from the object-side to the image-side, and a bisecting axis extending between the object-side and the image-side;
a first object-side CR reflection boundary and a plurality of first object-side color filters on a first side of the reference optical axis, wherein the plurality of first object-side color filters are spaced apart from and positioned generally parallel to the first object-side CR reflection boundary; and
a second object-side CR reflection boundary and a plurality of second object-side color filters positioned on a second side of the reference optical axis opposite the first side, wherein the plurality of second object-side color filters are spaced apart from and positioned generally parallel to the second object-side CR reflection boundary;
a first image-side CR reflection boundary and a plurality of first image-side color filters positioned on the first side of the reference optical axis, wherein the plurality of first image-side color filters are spaced apart from and positioned generally parallel to the first image-side CR reflection boundary; and
a second image-side CR reflection boundary and a plurality of second image-side color filters positioned on the second side of the reference optical axis opposite the first side, wherein the plurality of second image-side color filters are spaced apart from and positioned generally parallel to the second object-side CR reflection boundary;
wherein light from an object located on the object-side of the cloaking device assembly and obscured by the CR is redirected around the CR via at least two optical paths on the first side of the reference optical axis and at least two optical paths on the second side of the reference optical axis to form an image of the object on the image-side of the cloaking device assembly such that the light from the object appears to pass through the CR.

9. The cloaking device assembly of claim 8 , wherein:
the plurality of first object-side color filters on the first side of the reference optical axis comprise a plurality of first cut-off wavelengths;
the plurality of second object-side color filters on the second side of the reference optical axis comprise a plurality of second cut-off wavelengths;
the plurality of first image-side color filters on the first side of the reference optical axis comprise the plurality of first cut-off wavelengths;
the plurality of second image-side color filters on the second side of the reference optical axis comprise the plurality of second cut-off wavelengths; and
the plurality of first object-side color filters, the plurality of second object-side color filters, the plurality of first image-side color filters, and the plurality of second image-side color filters are sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis.

10. The cloaking device assembly of claim 9 , wherein the plurality of second cut-off wavelengths are equal to the plurality of first cut-off wavelengths.

11. The cloaking device assembly of claim 8 , wherein the plurality of first object-side color filters, the plurality of second object-side color filters, the plurality of first image-side color filters and the plurality of second image-side color filters are long-pass color filters.

12. The cloaking device assembly of claim 8 , wherein the plurality of first object-side color filters, the plurality of second object-side color filters, the plurality of first image-side color filters and the plurality of second image-side color filters are long-pass color filters sequentially arranged in a cut-off wavelength order between the reference optical axis and the bisecting axis with increasing short cut-off wavelengths from the reference optical axis to the bisecting axis.

13. The cloaking device assembly of claim 8 , wherein the plurality of first object-side color filters, the plurality of second object-side color filters, the plurality of first image-side color filters and the plurality of second image-side color filters are short-pass color filters.

14. The cloaking device assembly of claim 8 , wherein the plurality of first object-side color filt

Assignees

• Toyota Eng & Mfg North America

Inventors

• Ji Chengang
• Lee Kyu-Tae
• Banerjee Debasish

Classifications

• B60R1/10

  Front-view mirror arrangements; {(specially adapted for covering the peripheral part of the vehicle B60R1/002)}; Periscope arrangements {, i.e. optical devices using combinations of mirrors, lenses, prisms or the like (specially adapted for covering the peripheral part of the vehicle B60R1/002; for viewing traffic-lights B60R1/005); Other mirror arrangements giving a view from above or under the vehicle} · CPC title

• G02B17/006

  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 title

• G02B5/20 Primary

  Filters (polarising elements G02B5/30) · CPC title

• B60R1/007

  specially adapted for covering the lateral blind spot not covered by the usual rear-view mirror · CPC title

• B60R2300/202

  displaying a blind spot scene on the vehicle part responsible for the blind spot · CPC title