# US 11,442,219 B2 · Frustrum reflector plate

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,442,219 B2
- Document ID: US11442219B2
- Status: Granted
- Kind: B2
- Application number: 17/418,991
- Filed: 2019-03-05
- Published: 2022-03-31
- Granted: 2022-09-13
- Earliest claimed: 2019-03-05
- Assignees: Hewlett-Packard Development Company, L.P.
- Applicants: Hewlett-Packard Development Company, L.P.
- Inventors: Super Liao; Kuan-Ting Wu; Cheng-Hua Yu
- Web page: https://patentgrep.com/patent/US11442219B2

## CPC

- F21V 5/02: of prismatic shape (F21V5/04 takes precedence)
- G02B 6/0055: {Reflecting element, sheet or layer}
- F21V 7/05: plane
- F21V 13/04: the elements being reflectors and refractors {(for vehicle rear lights F21S43/40)}
- G02B 6/0086: {Positioning aspects}
- G02F 1/133615: {Edge-illuminating devices, i.e. illuminating from the side}
- G02B 6/0031: {Reflecting element, sheet or layer}
- G02F 1/133524: {Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides}
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- 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
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

A lighting system may include a light guide to receive light from a light source; and a reflector plate including a frustrum structure formed on the surface of the reflector plate to receive refracted light from the light guide.

## Claims

### Claim 1

A lighting system, comprising:
a light guide to receive light from a light source; and
a reflector plate, comprising:
a frustrum structure formed on the surface of the reflector plate to receive refracted light from the light guide, the frustrum structure comprising:
a first base, and
a second base parallel to the first base, wherein the first base has a larger surface area than the second base and the second base is coupled to the surface of the reflector plate.

### Claim 2 (depends on 1)

The lighting system of claim 1, wherein a plurality of frustrum structures are formed on the surface of the reflector plate to receive the refracted light along an entirely of a surface of the light guide facing the reflector plate.

### Claim 3 (depends on 1)

The lighting system of claim 1, wherein the frustrum structure and reflector plate are integrated into a single piece to receive refracted light throughout the entirety of the reflector plate.

### Claim 4 (depends on 1)

The lighting system of claim 1, wherein the frustrum structure is of the form of a right frustrum.

### Claim 5 (depends on 1)

The lighting system of claim 1, wherein the reflector plate comprises:
a first layer of frustrum structures; and
a second planar layer affixed to each of the plurality of frustrum structures to align the plurality of frustrum structures along a common plane.

### Claim 6 (depends on 5)

The lighting system of claim 5, wherein the second planar layer is a chassis of the lighting system.

### Claim 7 (depends on 6)

The backlight reflector of claim 6, wherein the plurality of frustrum prism structures comprises differently colored frustrum prism structures.

### Claim 8

A backlight reflector, comprising:
a plurality of frustrum prism structures aligned along a common plane, the prism structures comprising a plurality of trapezoidal surfaces, a first base, and a second base parallel to the first base, wherein the first base has a larger surface area than the second base; and
a planar layer coupled to each of the prism structures;
wherein:
each of the plurality of prism structures receive refracted light from a light guide and return the light incident to the light guide;
the second base of each of the plurality of prism structures are coupled to a surface of the planar layer; and
the first base is adjacent the light guide.

### Claim 9 (depends on 8)

The backlight reflector of claim 8, wherein a pitch of the prism structures is between 50 and 150 micrometers.

### Claim 10 (depends on 8)

The backlight reflector of claim 8, wherein the planar layer is a portion of a chassis used to hold the backlight reflector.

### Claim 11 (depends on 8)

The backlight reflector of claim 8, wherein each of the plurality of prism structures are in the form of a right frustrum and wherein angle of the side of the right frustrum are between 30 and 50 degrees relative to a base of the frustrum structures.

### Claim 12 (depends on 8)

The backlight reflector of claim 8, wherein a base of the prism structure faces the light guide.

### Claim 13 (depends on 8)

The backlight reflector of claim 8, wherein an angle of frustrum prism structures at an edge of the planar layer is different than an angle of frustrum prism structures at a center of the planar layer.

### Claim 14 (depends on 8)

The backlight reflector of claim 8, wherein a pitch between a first pair of adjacent frustrum prism structures is different than a second pair of adjacent frustrum prism structures based on a different placement of the first and second pair across the planar layer.

### Claim 15 (depends on 8)

The backlight reflector of claim 8, further comprising a gradient pitch among the plurality of frustrum prism structures across the planar layer.

### Claim 16

A method of forming a backlight reflector for a lighting system, comprising:
with a three-dimensional printing device:
forming a frustrum prism onto a planar surface, the frustrum prism comprising a first base and a second base which second base is parallel to the first base, wherein:
the first base has a larger surface area than the second base; and
the second base is coupled to the surface of the planar surface; and
placing the frustrum prism behind a light guide, wherein the first base is adjacent the light guide.

### Claim 17 (depends on 16)

The method of claim 16, wherein the planar surface is a chassis of the light system.

### Claim 18 (depends on 16)

The method of claim 16, wherein the planar surface is of a planar light guide.

### Claim 19 (depends on 16)

The method of claim 16, where the angle of the sides of the prism next to and relative to the base is between 30 and 50 degrees.

### Claim 20 (depends on 16)

The method of claim 16, further comprising, with the three-dimensional printing device, three-dimensional printing the frustrum prism on a chassis used to hold the backlight reflector.