# US 12,181,687 B2 · Optical devices and systems with dichroic beamsplitter color combiner

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- Number: US 12,181,687 B2
- Document ID: US12181687B2
- Status: Granted
- Kind: B2
- Application number: 18/586,678
- Filed: 2024-02-26
- Published: 2024-06-13
- Granted: 2024-12-31
- Earliest claimed: 2018-11-08
- Assignees: Lumus Ltd.
- Applicants: Lumus Ltd.
- Inventors: Eitan Ronen; Motke Gilo
- Web page: https://patentgrep.com/patent/US12181687B2

## CPC

- G02B 27/283: {used for beam splitting or combining}
- G02B 27/126: {The splitting element being a prism or prismatic array, including systems based on total internal reflection}
- G02B 27/141: {using dichroic mirrors}
- G02B 27/286: {for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another (G02B5/3083 takes precedence; light guide coupling means utilising polarising elements G02B6/34)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A first dichroic beamsplitter is deployed in a first prism on a plane oblique to a light-wave entrance surface. A second dichroic beamsplitter is deployed in a second prism on a plane oblique to a light-wave entrance surface such that polarized light in a first polarization state relative to the first dichroic beamsplitter is in a second polarization state relative to the second dichroic beamsplitter. The first dichroic beamsplitter transmits polarized light of a first color in the first polarization state relative to the first dichroic beamsplitter, and reflects polarized light of a second color in the first polarization state relative to the first dichroic beamsplitter. The second dichroic beamsplitter transmits polarized light of the first and second colors in a second polarization state relative to the second dichroic beamsplitter, and reflects polarized light of a third color in the first polarization state relative to the second dichroic beamsplitter.

## Claims

### Claim 1

An optical device comprising:
a first prism including:
a first light-wave entrance surface, a second light-wave entrance surface, and a light-wave exit surface, and
a first dichroic beamsplitter configuration deployed within the first prism on a plane oblique to at least one of the light-wave entrance surfaces;
a second prism including:
a first light-wave entrance surface, a second light-wave entrance surface, and a light-wave exit surface, and
a second dichroic beamsplitter configuration deployed within the second prism on a plane oblique to at least one of the light wave entrance surfaces of the second prism such that light in a first polarization state with regards to the first dichroic beamsplitter configuration is in a second polarization state with regards to the second dichroic beamsplitter configuration;
a first source of polarized light that produces red light that is s-polarized with regards to the first dichroic beamsplitter configuration;
a second source of polarized light that produces blue light that is s-polarized with regards to the first dichroic beamsplitter configuration; and
a third source of polarized light that produces green light that is s-polarized with regards to the first dichroic beamsplitter configuration, the first dichroic beamsplitter configuration transmitting the polarized red light and reflecting the polarized blue light so as to output polarized mixed light though the light-wave exit surface of the first prism, the polarized mixed light being a mixture of the polarized red light and the polarized blue light,
the second dichroic beamsplitter configuration transmitting the polarized mixed light and reflecting the polarized green light so as to output mixed light though the light wave exit surface of the second prism, the mixed light being a mixture of the polarized red light, polarized blue light and polarized green light.

### Claim 2 (depends on 1)

The optical device of claim 1, further comprising:
a chromatic retarder associated with the light-wave exit surface of the second prism, the chromatic retarder oriented to change a polarization state of the polarized red light and the polarized blue light of the mixed light.

### Claim 3 (depends on 1)

The optical device of claim 1, wherein the light-wave entrance surfaces of at least one of the first or the second prism are orthogonal to each other.

### Claim 4 (depends on 1)

The optical device of claim 1, wherein an optical coupling is provided between the light-wave exit surface of the first prism and the second light-wave entrance surface of the second prism, wherein the optical coupling optically couples the first prism with the second prism.

### Claim 5 (depends on 4)

The optical device of claim 4, wherein the optical coupling includes optical cement.

### Claim 6 (depends on 4)

The optical device of claim 4, wherein the optical coupling includes a mechanical arrangement.

### Claim 7 (depends on 1)

The optical device of claim 1, wherein at least one of the first prism or the second prism is a square cuboid prism.