# US 2014/0196525 A1 · Sensor device for detecting moisture on a pane

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- Number: US 2014/0196525 A1
- Document ID: US20140196525A1
- Status: Published application
- Kind: A1
- Application number: 14/157,128
- Filed: 2014-01-16
- Published: 2014-07-17
- Earliest claimed: 2013-01-17
- Assignees: Hella KGaA Hueck & Co.
- Applicants: Hella KGaA Hueck & Co.
- Inventors: Thomas NIEMANN; Torsten EGGERS
- Web page: https://patentgrep.com/patent/US20140196525A1

## CPC

- G01N 21/55: Specular reflectivity
- B60S 1/0833: {Optical rain sensor}
- G01N 21/552: Attenuated total reflection
- B60S 1/0837: {with a particular arrangement of the optical elements}
- 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)
- B60S: SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR

## Abstract

In a sensor device for detecting moisture on a pane comprising at least one transmitter which emits light which is reflected at the pane and received by at least one receiver, an optical system is provided between the transmitter and the receiver, which brings about a multiple reflection between the pane and the optical system. A particularly good measurement is thereby made possible.

## Claims

### Claim 1

A sensor device for detecting moisture on a pane comprising at least one transmitter which emits light which is reflected at the pane and received by at least one receiver,
wherein an optical system is provided between the transmitter and the receiver, which brings about a multiple reflection between the pane and the optical system,
wherein the sensor device has a frame which can be fastened to the pane, the optical system extends in an annular shape over the entire frame, and the frame of the sensor device is used for holding further components, in particular a camera.

### Claim 2 (depends on 1)

The sensor device according to claim 1, wherein the optical system has a mirror which is disposed parallel to the pane.

### Claim 3 (depends on 1)

The sensor device according to claim 1, wherein transmitters and receivers are configured as diodes.

### Claim 4 (depends on 1)

The sensor device according to claim 1, wherein the optical system is disposed on the inner side of the frame.

### Claim 5 (depends on 1)

The sensor device according to claim 1, wherein the optical system is designed such that the multiple reflection takes place at angles between 40° and 50°.

### Claim 6 (depends on 1)

The sensor device according to claim 1, wherein the optical system is configured in such a manner that the angle of reflection at the pane smaller than the angle of reflection in the optical system, in particular the mirror disposed in the optical system.

### Claim 7 (depends on 1)

Motor vehicle having a windscreen and sensor device according to claim 1 disposed on the widescreen.