# US 10,502,870 B2 · Optical assembly

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- Number: US 10,502,870 B2
- Document ID: US10502870B2
- Status: Granted
- Kind: B2
- Application number: 14/433,589
- Filed: 2013-10-02
- Published: 2015-09-10
- Granted: 2019-12-10
- Earliest claimed: 2012-10-04
- Assignees: North Inc.
- Applicants: North Inc.
- Inventors: Christophe Le Gros; Jonathan Masson; Lucio Kilcher
- Web page: https://patentgrep.com/patent/US10502870B2

## CPC

- G02B 3/005: {arranged along a single direction only, e.g. lenticular sheets (G02B3/0043 takes precedence)}
- G02B 3/0006: {Arrays (G02B3/02, G02B5/188 take precedence)}
- G02B 3/0056: {arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses (G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085)}
- G02B 5/0215: {the surface having a regular structure}
- G02B 13/22: Telecentric objectives or lens systems
- G02B 5/10: with curved faces
- G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)}
- G02B 2027/0118: {comprising devices for improving the contrast of the display / brillance control visibility}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical assembly, and in particular an optical assembly which uses a microlens array or a micromirror array to reduce speckle. It further concerns an optical component which comprises a micromirror array.

## Claims

### Claim 1

An optical assembly comprising:
a microlens array, the microlens array comprising a first surface to receive light and a second surface to emit light;
a Fresnel lens disposed adjacent to the second surface to optically communicate with the second surface of the microlens array; and
a pin hole array disposed adjacent to the second surface of the microlens array between the microlens array and the Fresnel lens, the pin hole array disposed a distance from the microlens array substantially equal to the focal length of the microlens array.

### Claim 2 (depends on 1)

The optical assembly of claim 1, comprising an array of lenslets defining the first surface.

### Claim 3 (depends on 2)

The optical assembly of claim 2, wherein a size of each pin hole of the pin hole array is greater than or equal to a spot size of the light emitted by the microlens array.

### Claim 4 (depends on 3)

The optical assembly of claim 3, wherein the size of each pin hole of the pin hole array is between 1 and 100 micrometers.

### Claim 5 (depends on 1)

The optical assembly of claim 1, comprising a telecentric lens to optically communicate with the microlens array.

### Claim 6 (depends on 1)

The optical assembly of claim 1, wherein the pin hole array comprises light absorbing material.