Holographic sensor, especially for recognition of moisture on a glass pane of a motor vehicle

• US 20040075828A1
• Filed: 11/12/2003
• Published: 04/22/2004
• Est. Priority Date: 09/26/2001
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Stampfer, Stefan, Sautter, Helmut
• Granted Patent: US 7,187,440 B2
• Time in Patent Office: Days
• US Class Current: 356/239.8
• CPC Class Codes: B60S 1/0822 characterized by the arrangement or type of detection means
• CPC Class Codes: B60S 1/084 including a hologram
• CPC Class Codes: B60S 1/0881 characterized by the attachment means on the windshield
• CPC Class Codes: B60S 1/0888 characterized by the attachment of the elements in a unit
• CPC Class Codes: G01N 21/552 Attenuated total reflection

Abstract

A holographic sensor for recognizing moisture on a glass pane (14) of a motor vehicle, having a casing (22), a carrier layer (28), and a diffractive element (12) and an adhesive layer (30), the diffractive element (12) being fixed, preferably glued, on the carrier layer (28). Furthermore, a sensor is shown, whose diffractive element (12) is embodied as an embossed hologram.

Claims

1. A holographic sensor, in particular for recognizing moisture on a glass pane (14) of a motor vehicle, having a casing (22) and at least one diffractive element (12),

wherein a carrier layer (28) is provided, on which the at least one diffractive element (12) is fixed, preferably glued thereon.

2. The holographic sensor as recited in claim 1,

wherein the carrier layer (28) may be attached, preferably glued, to the glass pane (14).

3. The holographic sensor as recited in one of the preceding claims,

wherein at least one transmitter (16) and/or at least one receiver (20) are situated in the casing (22) and the casing (22) is connected at least indirectly to the carrier layer (28).

4. The holographic sensor as recited in one of the preceding claims,

wherein the carrier layer (28) is connected to at least one fixing element (24) to which the casing (22) is fixed.

5. The holographic sensor as recited in claim 1,

wherein

at least one transmitter (16) and/or receiver (20) are situated in the casing (22), able to emit or receive the radiation having at least one frequency f,

the fixing element (24), at least in parts, is essentially transparent for the radiation of at least one frequency f,

the fixing element (24) may be attached to the glass pane (14),

the fixing element (24) bears the carrier layer (28) bearing the diffractive element (12).

6. The holographic sensor as recited in one of claims 4 or 5,

wherein the fixing element (24) is designed as one piece with the carrier layer (28).

7. A holographic sensor, in particular for recognizing moisture on a glass pane (14) of a motor vehicle, having a casing (22) and a diffractive element (12), which may be glued to the glass pane (14) via an adhesive layer (30),

wherein the diffractive element (12) is embodied as an embossed hologram.