# US 2014/0194748 A1 · Imaging device

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- Number: US 2014/0194748 A1
- Document ID: US20140194748A1
- Status: Published application
- Kind: A1
- Application number: 14/137,242
- Filed: 2013-12-20
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Olympus Corporation
- Applicants: Olympus Corporation
- Inventors: Yusuke Yamamoto; Kosei Tamiya
- Web page: https://patentgrep.com/patent/US20140194748A1

## CPC

- A61B 5/0059: {using light, e.g. diagnosis by transillumination, diascopy, fluorescence (photoacoustic A61B5/0093; optical measurement of heart rate A61B5/02416; optical measurement of blood flow A61B5/0261; optical measurement of analytes A61B5/1455)}
- A61B 5/0086: {using infrared radiation}
- A61B 5/489: {Blood vessels}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

A color filter has a transmission band in a visible region and an infrared region. A first substrate is arranged below the color filter and has a first photoelectric conversion element which outputs a first signal charge according to an amount of exposure of a light passing through the color filter. A second substrate has a second photoelectric conversion element outputting a second signal charge according to an amount of exposure of a light, having sensitivity in at least the infrared region, which passes through the first substrate, and is arranged on a surface on an opposite side to a light-receiving surface of the first substrate. A signal read-out circuit reads out the first signal charge as a first electrical signal, and reads out the second signal charge as a second electrical signal.

## Claims

### Claim 1

An imaging device comprising:
a first filter that has a transmission band transmitting a light of a visible region and an infrared region;
a first substrate that is arranged below the first filter, and has a first photoelectric conversion element which outputs a first signal charge according to an amount of exposure of a light passing through the first filter;
a second substrate that has a second photoelectric conversion element outputting a second signal charge according to an amount of exposure of a light, having sensitivity in at least the infrared region, which passes through the first substrate, and is arranged on a surface on an opposite side to a light-receiving surface of the first substrate; and
a signal read-out circuit that reads out the first signal charge as a first electrical signal, and reads out the second signal charge as a second electrical signal.

### Claim 2 (depends on 1)

The imaging device according to claim 1, wherein a size of a pixel including the second photoelectric conversion element is integer times a size of a pixel including the first photoelectric conversion element.

### Claim 3 (depends on 1)

The imaging device according to claim 1, wherein the first filter includes a filter that transmits a plurality of types of light beams of the infrared region.

### Claim 4 (depends on 1)

The imaging device according to claim 1, further comprising a second filter that is arranged between the first substrate and the second substrate and shields the light of the visible region.

### Claim 5 (depends on 1)

The imaging device according to claim 1, further comprising a correction circuit that reduces influence on the first signal charge which derives from the light of the infrared region, by using the second electrical signal.

### Claim 6 (depends on 1)

The imaging device according to claim 1, further comprising:
a supporting base that supports a finger;
an illumination system that irradiates the supporting base with a light having a spectral distribution in the visible region and the infrared region; and
an optical system that guides a light passing through the finger, which is supported by the supporting base, and a light reflected at the finger to the first substrate.

### Claim 7 (depends on 1)

The imaging device according to claim 1, further comprising:
an illumination system that irradiates a subject with a light having spectral distribution in the visible region and an excitation light exiting fluorescence which has spectral distribution in the infrared region; and
an optical system that guides a light from the subject to the first substrate.