# US 2016/0259096 A1 · Optical absorber which absorbs light beam

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- Number: US 2016/0259096 A1
- Document ID: US20160259096A1
- Status: Published application
- Kind: A1
- Application number: 15/057,573
- Filed: 2016-03-01
- Published: 2016-09-08
- Earliest claimed: 2015-03-02
- Assignees: Fanuc Corporation
- Applicants: Fanuc Corporation
- Inventors: Takafumi Murakami; Michinori Maeda
- Web page: https://patentgrep.com/patent/US20160259096A1

## CPC

- G02B 5/003: {Light absorbing elements}
- G02B 7/008: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical absorber includes a first light-absorbing body which receives light incident from an entrance aperture and partially absorbs and reflects the incident light, and a second light-absorbing body which partially absorbs the incident light reflected by the first light-absorbing body and partially reflects the incident light toward the first light-absorbing body. The reflectance and light resistance of the first light-absorbing body are set higher than the reflectance and light resistance, respectively, of the second light-absorbing body.

## Claims

### Claim 1

An optical absorber comprising:
a first light-absorbing body which receives light incident from an entrance aperture and partially absorbs and reflects the incident light; and
a second light-absorbing body which partially absorbs the incident light reflected by the first light-absorbing body and partially reflects the incident light toward the first light-absorbing body,
wherein a reflectance and a light resistance of the first light-absorbing body are set higher than a reflectance and a light resistance, respectively, of the second light-absorbing body.

### Claim 2 (depends on 1)

The optical absorber according to claim 1, wherein a space surrounded by the first light-absorbing body and the second light-absorbing body is closed except for the entrance aperture.

### Claim 3 (depends on 1)

The optical absorber according to claim 1, wherein the incident light and the light reflected by the second light-absorbing body at least partially overlap each other in the first light-absorbing body.

### Claim 4 (depends on 1)

The optical absorber according to claim 1, further comprising a cooling unit which cools at least one of the first light-absorbing body and the second light-absorbing body.

### Claim 5 (depends on 4)

The optical absorber according to claim 4, further comprising a connecting member which connects the first light-absorbing body and the second light-absorbing body so as to transfer heat.

### Claim 6 (depends on 1)

The optical absorber according to claim 1, wherein the first light-absorbing body has a reflectance which is between 40% and 60%.

### Claim 7 (depends on 1)

The optical absorber according to claim 1, wherein the second light-absorbing body has a reflectance which is greater than 0% but is smaller than or equal to 10%.