Glare protection device
AssigneeOptrel AG
InventorPeter Hones
Life of this patent
Estimating the term…
Abstract
The glare protection device for welding applications contains an active electro-optical filter element (2) with an electronic control circuit (3). The active filter element (2) absorbs the UV-radiation up to 380 nm. An IR-plastic filter (10) is completely joined with the active electro-optical filter element by a compact adhesive layer (11) and together with it forms a single optical and mechanical unit (1) having a high transmittance in the visual region of the spectrum. The IR-plastic filter (10) contains a dye that absorbs the infrared radiation in a wavelength range of 780-1400 nm. With this, a robust, cheap and safe in operation glare protection device for various applications is created.
Claims16
A glare protection device comprising:
- an active electro-optical filter element (2), which comprises at least one liquid crystal (LCD) layer (5) as well as polarisation layers (8, 18), with a dedicated electronic control circuit (3) for controlling the transmission of the active electro-optical filter element (2), wherein the active electro-optical filter element (2) practically completely absorbs the ultraviolet (UV) radiation in the spectrum up to 380 nm so that the UV-transmittance of the active electro-optical filter element (2) in the spectrum up to 380 nm amounts to a maximum of about 0.1%, and wherein the UV-absorption takes place primarily in the polarisation layers (8, 18) of the active electro-optical filter element (2);
- an infrared (IR) plastic filter (10) comprising a dye that is stable over time, and that absorbs infrared (IR) radiation in a wavelength range of at least 780 nm to 1400 nm, wherein the IR-plastic filter (10) is completely joined to the active electro-optical filter element (2) by means of a compact adhesive layer (11);
- and
- the IR-plastic filter (10) and the active electro-optical filter element (2) together form a compact optical and mechanical unit (1) having a transmittance in the visible range of the spectrum from 400 nm to 650 nm, which amounts to at least 3.2%.
A glare protection device comprising:
- an active electro-optical filter element (2), which comprises at least one liquid crystal (LCD) layer (5) as well as polarisation layers (8, 18), with a dedicated electronic control circuit (3) for controlling the transmission of the active electro-optical filter element (2), wherein the active electro-optical filter element (2) practically completely absorbs the ultraviolet (UV) radiation in the spectrum up to 380 nm so that the UV-transmittance of the polarisation layers (8, 18) of the active electro-optical filter element (2) in the spectrum up to 380 nm amounts to a maximum of about 0.1%;
- an infrared (IR) plastic filter (10) comprising a dye that is stable over time, and that absorbs infrared (IR) radiation in a wavelength range of at least 780 μm to 1400 μm, so that the mean transmittance of the IR-plastic filter (10) between 780 nm and 1400 nm amounts to a maximum of 0.2%, wherein the IR-plastic filter (10) is completely joined to the active electro-optical filter element (2) by means of a compact adhesive layer (11);
- and
- the IR-plastic filter (10) and the electro-optical active filter element (2) together form a compact optical and mechanical unit (I) having a transmittance in the visible range of the spectrum from 400 nm to 650 nm, which amounts to at least 3.2%.
Dependencies are inferred from the claim text.