# US 10,871,270 B2 · Optical devices for providing corridor dual wallwash

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- Number: US 10,871,270 B2
- Document ID: US10871270B2
- Status: Granted
- Kind: B2
- Application number: 16/014,421
- Filed: 2018-06-21
- Published: 2018-12-27
- Granted: 2020-12-22
- Earliest claimed: 2017-06-22
- Assignees: Signify Holding B.V.
- Applicants: Signify Holding B.V.
- Inventors: Orestes Orbe
- Web page: https://patentgrep.com/patent/US10871270B2

## CPC

- F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)}
- F21V 5/043: {the lens having cylindrical faces, e.g. rod lenses, toric lenses}
- F21V 7/0091: {using total internal reflection}
- F21V 7/045: {with spherical surface}
- F21V 7/06: with parabolic curvature
- F21V 7/09: with a combination of different curvatures
- G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems}
- G02B 19/0061: {the light source comprising a LED}
- F21Y 2101/00: Point-like light sources
- F21Y 2115/10: Light-emitting diodes [LED]
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

An optical device for a light fixture can include a quasi-semi-cylindrical outer perimeter that includes a substantially planar bottom surface, a top surface located adjacent to the bottom surface, where the top surface has a curvature, and a pair of side surfaces located adjacent to the bottom surface and the top surface, where the pair of side surfaces are located opposite each other. The optical device can also include a body bounded by the outer perimeter. The optical device can further include an inner optical feature disposed in the body at the bottom surface, where the inner optical feature forms a cavity bounded by multiple segments, wherein each two adjacent segments form an angle relative to each other. The cavity can be configured to receive a light source of the light fixture.

## Claims

### Claim 1

An optical device for a light fixture, the optical device comprising:
a quasi-semi-cylindrical outer perimeter comprising:
a substantially planar bottom surface;
a top surface located adjacent to the bottom surface, wherein the top surface has a width and a curvature along its length; and
a pair of side surfaces located adjacent to the bottom surface and the top surface, wherein the pair of side surfaces are located opposite each other;
a body bounded by the outer perimeter; and
an inner optical feature disposed in the body at the bottom surface, wherein the inner optical feature forms a cavity bounded by a plurality of segments, wherein each two adjacent segments form a non-perpendicular angle relative to each other, wherein the plurality of segments of the inner optical feature are configured to refract light emitted by a light source into the cavity,
wherein the cavity is configured to receive a light source of the light fixture,
wherein the inner optical feature and the top surface are symmetrical about an axis that runs parallel to the width of the top surface and through a middle of the planar bottom surface and about a plane through the axis that is perpendicular to the substantially planar bottom surface,
wherein each side surface of the pair of side surfaces comprises a refractive material, wherein the pair of side surfaces are configured to reflect, through total internal reflection, a portion of the light refracted by the plurality of segments of the inner optical feature,
wherein the top surface is configured to further refract the portion of the light reflected off the pair of side surfaces and a remainder of the light emitted by the light source that is refracted by the plurality of segments without previously coming into contact with the pair of side surfaces, and
wherein the light emitted through the top surface diverges from a virtual axis perpendicular to the substantially planar bottom surface.

### Claim 2 (depends on 1)

The optical device of claim 1, wherein the curvature of the top surface forms a semi-circle.

### Claim 3 (depends on 1)

The optical device of claim 1, wherein the bottom surface comprises at least one coupling feature that is configured to couple to the light fixture.

### Claim 4 (depends on 1)

The optical device of claim 1, wherein the portion of the light and the remainder of the light traveling through the body are substantially unaltered by the body.

### Claim 5 (depends on 1)

The optical device of claim 1, wherein the plurality of segments that form the cavity of the inner optical feature comprise a first segment, a second segment, a third segment, and a fourth segment, wherein the first segment is adjacent to the bottom surface, wherein the second segment is adjacent to the first segment, wherein the third segment is adjacent to the second segment, and wherein the fourth segment is adjacent to the third segment and the bottom surface.

### Claim 6 (depends on 5)

The optical device of claim 5, wherein the first segment and the second segment are separated by a first junction, wherein the second segment and the third segment are separated by a second junction, wherein the third segment and the fourth segment are separated by a third junction, wherein the first junction and the third junction have a first length, wherein the second junction has a second length, wherein the second length is greater than the first length.

### Claim 7 (depends on 5)

The optical device of claim 5, wherein the first segment and the bottom surface form a first angle, wherein the fourth segment and the bottom surface form the first angle, wherein the first segment and the second segment form a second angle, wherein the third segment and the fourth segment form the second angle, and wherein the second segment and the third segment form a third angle.

### Claim 8 (depends on 7)

The optical device of claim 7, wherein the first angle is acute, wherein the second angle is obtuse, and wherein the third angle is acute.

### Claim 9 (depends on 8)

The optical device of claim 8, wherein light traversing through the top surface, when the bottom surface is coupled to the light fixture in a ceiling of a corridor, is emitted toward both side walls in the corridor at a wallwash angle with no direct down light.

### Claim 10 (depends on 9)

The optical device of claim 9, wherein the wallwash angle is approximately 30° from vertical.

### Claim 11 (depends on 7)

The optical device of claim 7, wherein the first angle is acute, wherein the second angle is obtuse, and wherein the third angle is obtuse.

### Claim 12 (depends on 11)

The optical device of claim 11, wherein the first angle is acute, wherein the second angle is slightly greater than 90°, and wherein the third angle is slightly less than 180°.

### Claim 13 (depends on 12)

The optical device of claim 12, wherein light traversing through the top surface, when the bottom surface is coupled to the light fixture in a ceiling of a corridor, is emitted toward both side walls in the corridor with direct down light.

### Claim 14 (depends on 13)

The optical device of claim 13, wherein positioning the optical device below a plane formed by the ceiling eliminates harsh shadows along a top end of both side walls adjacent to the ceiling.

### Claim 15 (depends on 1)

The optical device of claim 1, wherein the plurality of segments of the inner optical feature are oriented along a length of the bottom surface, wherein the length of the bottom surface is defined by two opposing ends that adjoin the top surface.

### Claim 16 (depends on 1)

The optical device of claim 1, wherein each segment of the plurality of segments is a spline.

### Claim 17

A light fixture comprising:
a light source assembly comprising at least one light source; and
an optical device disposed adjacent to the at least one light source, wherein the optical device comprises:
a quasi-semi-cylindrical outer perimeter comprising:
a bottom surface that is substantially planar;
a top surface located adjacent to the bottom surface, wherein the top surface has a curvature; and
a pair of side surfaces located adjacent to the bottom surface and the top surface, wherein the pair of side surfaces are located opposite each other;
a body bounded by the outer perimeter; and
an inner optical feature disposed in the body at the bottom surface, wherein the inner optical feature forms a cavity bounded by at least four segments, wherein each two adjacent segments form an angle relative to each other,
wherein the at least one light source is disposed in the cavity,
wherein light emitted by the at least one light source travels through the cavity of the inner optical feature and is refracted by at least one of the at least four segments,
wherein at least a portion of the light is subsequently reflected, through total internal reflection, off of one of the pair of side surfaces within the body,
wherein the at least a portion of the light subsequently exits the body through and is refracted by the top surface of the quasi-semi-cylindrical outer perimeter, and
wherein the inner optical feature is symmetrical along a virtual plane oriented along the length of the inner optical feature.

### Claim 18 (depends on 17)

The light fixture of claim 17, wherein the optical device is a total internal reflection optic that only allows light emitted by the at least one light source of the light source assembly to exit through the top surface of the optical device.

### Claim 19

An optical device for a light fixture, the optical device comprising:
a quasi-semi-cylindrical outer perimeter comprising:
a substantially planar bottom surface;
a top surface located adjacent to the bottom surface, wherein the top surface has a curvature along its length and a width; and
a pair of side surfaces located adjacent to the bottom surface and the top surface,
wherein the pair of side surfaces are located opposite each other;
a body bounded by the outer perimeter; and
an inner optical feature disposed in the body at the bottom surface, wherein the inner optical feature forms a cavity bounded by a plurality of segments, wherein each two adjacent segments form an angle relative to each other,
wherein the cavity is configured to receive a light source of the light fixture,
wherein the inner optical feature and the top surface are symmetrical about a virtual plane in the body that is perpendicular to the substantially planar bottom surface,
wherein the virtual plane is oriented along the width of the substantially planar bottom surface, and wherein the virtual plane, when extended into the cavity, intersects a middle of the substantially planar bottom surface along a length of the substantially planar bottom surface, wherein at least a portion of the light is subsequently reflected, through total internal reflection, off of one of the pair of side surfaces within the body,
wherein light emitted by the light source traverses through the top surface and forms a split beam on either side of the virtual plane with no direct down light along the virtual plane.

### Claim 20 (depends on 19)

The optical device of claim 19, wherein light emitted into the cavity only exits through the top surface.