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Detect contamination of leds

A radiator and cooling device technology, applied in the field of LED pollution detection, can solve problems such as UV light reflection, cover breakage, etc.

Active Publication Date: 2020-01-07
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem that arises in practice with such radiators is that the UV light is reflected by dirt on the transparent cover
This causes a temperature difference within the disc (transparent cover) which causes stress
If the temperature difference is too high, the cover will break

Method used

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  • Detect contamination of leds

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Embodiment Construction

[0015] The printed circuit board 2 in the printing machine 1 has a plurality of LED radiators 3 which are each assigned a cooling device 5 . A transparent cover 4 is provided in the outlet region of the UV radiation. The temperature of cooling device 5 is monitored permanently, which takes place via electronics 8 , which is connected to the controller of printing press 1 and to optical output means 6 . Calculate the average value from the measurement results. Based on this average value, a threshold value is ascertained over time, which is smaller than the temperature difference value between the average temperature and the temperature at which the transparent cover 4 could break if the individual cooling units reached this temperature. In addition, limit values ​​for the average temperature are defined. If this limit value is reached, this means that the transparent cover 4 is heavily soiled and must be cleaned or replaced. First, the transparent cover 4 is clean. The tem...

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Abstract

The invention relates to a device for detecting contamination of a transparent cover of a printed circuit board with LED radiators. The LED radiators are cooled individually or in groups. The device is characterized in that the temperature of individual or groups of cooling devices is detected and contamination is deduced from a comparison of the temperatures with one another.

Description

Background technique [0001] LED UV dryer is used to harden UV ink (UV-Farbe) or UV varnish (UV-Lack). This is especially the case when printing three-dimensional components and sheets of any material with the aid of an inkjet or offset printing press. [0002] DE 10 2009 007 873 A1 describes an LED dryer for printing presses for curing inks that are dried by UV light. In this case, a plurality of LEDs are arranged in rows on the carrier transversely to the conveying direction of the printing material. [0003] A device for preventing contamination of LEDs is described in WO 2011 / 031529 A2. Here, a plurality of LEDs are accommodated in a housing which is provided with a transparent cover in the region of the outlet for the UV radiation. [0004] A device is known from DE 10 2013 019 814 A1, which makes it possible to ascertain the degree of contamination of a transparent cover of an LED module. In this case, the temperature measurement is carried out at one or more points o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J29/38B41J11/00B41J29/00B41F23/04B41F33/00G21K5/00
CPCB41F23/04B41F33/0036B41J11/002B41J29/00B41J29/38G21K5/00B41F23/0453B41F33/00B41J11/00214G01K13/00B41F7/02
Inventor O·戈特沙尔特M·科尔曼
Owner HEIDELBERGER DRUCKMASCHINEN AG