# US 2019/0355870 A1 · Optical structure

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- Number: US 2019/0355870 A1
- Document ID: US20190355870A1
- Status: Published application
- Kind: A1
- Application number: 16/414,282
- Filed: 2019-05-16
- Published: 2019-11-21
- Earliest claimed: 2018-05-19
- Assignees: Mettler-Toledo Instruments (Shanghai) Co., Ltd.; Mettler-Toledo International Trading (Shanghai) Co., Ltd.
- Applicants: Mettler-Toledo Instruments (Shanghai) Co. Ltd; Mettler-Toledo International Trading (Shanghai) Co. Ltd
- Inventors: Changlin Wang; Hong Zhu; Fengjin Wang; Min Xu; Cong Wang
- Web page: https://patentgrep.com/patent/US20190355870A1

## CPC

- G02B 27/141: {using dichroic mirrors}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical structure has a cavity (1) with an opening provided at one end and a first through hole or first gap (21) provided at the end opposite the opening. The cavity is further provided internally with a beam splitter or a dichroic mirror (4). A first LED (31) emits light into the cavity through the first through hole or the first gap, which passes directly passing through the beam splitter or dichroic mirror and exits from the opening of the cavity A second LED (32) emits light into the cavity through a second through hole or second gap (22) in a side of the cavity, which is reflected by the beam splitter or dichroic mirror. It is then fused with the light emitted by the first LED. The light emitted by the respective LEDs have an identical optical path length to the beam splitter or the dichroic mirror.

## Claims

### Claim 1

An optical structure, comprising:
a cavity with an opening provided at an end thereof, a first through hole or gap provided at an end opposite the opening, a second through hole or gap provided along one side of the cavity, and a beam splitter or dichroic mirror positioned internally in the cavity;
a first light-emitting diode (“LED”), arranged to emit light into the cavity through the first through hole or gap such that the light emitted passes directly through the beam splitter or dichroic mirror and exits from the opening; and
a second LED, arranged to emit light into the cavity through the second through hole or gap that is provided in one side of the cavity such that the light emitted is reflected by the beam splitter or dichroic mirror and fuses with the light emitted by the first LED, wherein the light emitted by the respective LEDs to the beam splitter or the dichroic mirror has the same optical path length.

### Claim 2 (depends on 1)

The optical structure of claim 1, further comprising:
a photodiode, arranged at a third through hole in the cavity or at the second gap and at a set distance from the second LED.

### Claim 3 (depends on 2)

The optical structure of claim 2, further comprising:
a light barrier, disposed between the photodiode and the second LED to keep the photodiode from direct exposure to the light emitted by the second LED.

### Claim 4 (depends on 1)

The optical structure of claim 1, further comprising:
a first circuit board on which the first LED is provided; and
a second circuit board on which the second LED is provided.

### Claim 5 (depends on 3)

The optical structure of claim 3, further comprising:
a first circuit board on which the first LED is provided; and
a second circuit board on which the second LED and photodiode are provided.

### Claim 6 (depends on 1)

The optical structure of claim 1, wherein the first LED and the second LED emit light at the same time.

### Claim 7 (depends on 1)

The optical structure of claim 1, wherein the first LED and the second LED emit light at different times.

### Claim 8 (depends on 1)

The optical structure of claim 1, further comprising:
a lens or lens set, disposed at the opening of the cavity, to convert the fused light into parallel light or condensed light.

### Claim 9 (depends on 8)

The optical structure of claim 8, wherein the lens or lens set is removably disposed at the opening.

### Claim 10 (depends on 8)

The optical structure of claim 8, further comprising:
a connector, threadingly connected at the opening of cavity, to dispose the lens or lens set.

### Claim 11 (depends on 1)

The optical structure of claim 1, wherein the light emitted by the first LED has a different wavelength than the light emitted by th second LED.

### Claim 12 (depends on 1)

A sensor, comprising:
an optical structure according to claim 1.

### Claim 13 (depends on 12)

The sensor of claim 12, wherein:
the sensor is a chroma sensor.

### Claim 14 (depends on 13)

The sensor of claim 13, wherein:
the sensor is a turbidity sensor.

### Claim 15 (depends on 12)

The sensor of claim 12, wherein:
the sensor is a combined chroma/turbidity two-in-one sensor.