# US 8,570,522 B2 · Capturing reflected light from a sampling surface

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- Number: US 8,570,522 B2
- Document ID: US8570522B2
- Status: Granted
- Kind: B2
- Application number: 13/538,558
- Filed: 2012-06-29
- Published: 2012-10-25
- Granted: 2013-10-29
- Earliest claimed: 2010-04-29
- Assignees: Microsoft Corporation
- Applicants: Jiaping Wang; Moshe Benezra; Xin Tong; John Michael Snyder; Baining Guo
- Inventors: Jiaping Wang; Moshe Benezra; Xin Tong; John Michael Snyder; Baining Guo
- Web page: https://patentgrep.com/patent/US8570522B2

## CPC

- G01N 21/55: Specular reflectivity
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A mechanism is disclosed for capturing reflected rays from a surface. A first and second lens aligned along a same optical center axis are configured so that a beam of light collimated parallel to the lens center axis directed to a first side, is converged toward the lens center axis on a second side. A first light beam source between the first and second lenses directs a light beam toward the first lens parallel to the optical center axis. Second light beam source(s) on the second side of the first lens, direct a light beam toward a focal plane of the first lens at a desired angle. An image capturing component, at the second side of the second lens, has an image capture surface directed toward the second lens to capture images of the light reflected from a sample capture surface at the focal plane of the first lens.

## Claims

### Claim 1

A system, comprising:
a compound lens comprising at least two lenses disposed in a manner that provides for a first focal plane at a first end of the compound lens and a second focal plane at a second end of the compound lens;
a first light source configured to direct light toward the first focal plane, a light beam from the first light source having an angle of bias from an optical center axis of the compound lens of greater than or equal to zero degrees and less than or equal to forty-five degrees;
a second light source configured to direct light toward the first focal plane, a light beam from the second light source having an angle of bias from the first focal plane of less than or equal to forty-five degrees and greater than or equal to zero degrees; and
an image capture device disposed at the second end and configured to capture light that, before being captured by the image capture device, is directed through at least part of the compound lens before being reflected from the first focal plane and directed, from the first focal plane, toward the image capture device via a first lens and a second lens comprised in the compound lens, where the first light source is between the first lens and the second lens.

### Claim 2 (depends on 1)

The system of claim 1, the reflected light reflected from the first focal plane to an image plane at the second end.

### Claim 3 (depends on 2)

The system of claim 2, the image plane and the second end of the compound lens defining an aperture therebetween.

### Claim 4 (depends on 1)

The system of claim 1, the image capture device comprising a complementary metal-oxide-semiconductor (CMOS) sensor.

### Claim 5 (depends on 1)

The system of claim 1, where the light that is directed through at least part of the compound lens before being reflected from the first focal plane is directed through merely one lens before being reflected from the first focal plane.

### Claim 6

A device, comprising:
a compound lens comprising at least two lenses disposed in a manner that provides for a first focal plane at a first end of the compound lens and a second focal plane at a second end of the compound lens;
a first light source configured to direct light toward the first focal plane, a light beam from the first light source having an angle of bias from an optical center axis of the compound lens of greater than or equal to zero degrees and less than or equal to forty-five degrees, where the first light source is between a first lens proximate the first end and a second lens proximate the second end;
a second light source, different than the first light source, configured to direct light toward the first focal plane, a light beam from the second light source having an angle of bias from the first focal plane of less than or equal to forty-five degrees and greater than or equal to zero degrees, the light beam from the second light source not directed through a lens prior to reaching the first focal plane; and
an image capture device disposed at the second end and configured to capture light reflected from the first focal plane to an image plane at the second end.

### Claim 7 (depends on 6)

The device of claim 6, the image plane and the second end of the compound lens defining an aperture therebetween.

### Claim 8 (depends on 6)

The device of claim 6, the image capture device comprising a complementary metal-oxide-semiconductor (CMOS) sensor.

### Claim 9 (depends on 6)

The device of claim 6, comprising a casing configured to mitigate light infiltration from outside the casing to inside the casing, the casing comprising a mechanism for mounting at least an image capture surface of the image capture device.

### Claim 10 (depends on 6)

The device of claim 6, comprising a casing configured to mitigate light infiltration from outside the casing to inside the casing, the casing comprising a mechanism for mounting at least one of the first light beam source or the second light beam source.