Temperature indicator

A temperature indicator and indication technology, applied to thermometers, instruments, and thermometers with physical/chemical changes, etc., can solve problems such as user erroneous impressions, complex temperature indicators, and temperature indicators that cannot give any information, etc., to achieve manufacturing and handle the effect easily
CN101040175AInactive Publication Date: 2007-09-19KONINK PHILIPS ELECTRONICS NV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KONINK PHILIPS ELECTRONICS NV
Publication Date
2007-09-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

A temperature indicator (1) for indicating a high temperature at a surface (13) comprises a light-emitting electrochemical cell (4) having a first electrode (8), a second electrode (9) and a light-emitting layer (10) being sandwiched between the two electrodes (8, 9). The light-emitting layer (10) comprises a matrix and ions being movable in the matrix, the mobility of said ions in said matrix being temperature dependent. A power source (5) is adapted for driving the light-emitting cell (4) with an AC voltage. The frequency of the AC voltage is tuned in such a way that, above a certain temperature level, the ions move fast enough in the matrix to provide a sufficient charge gradient in the light-emitting electrochemical cell (4) for the light-emitting electrochemical cell (4) to emit light before the AC power source (5) shifts the polarity of the voltage.
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Description

technical field

[0001] The present invention relates to a temperature indicator adapted to be placed on a surface for providing a visual indication of the temperature of the surface.

[0002] The invention also relates to a method of forming a temperature indicator adapted to be placed on a surface for providing a visual indication of the temperature of the surface. Background technique

[0003] High temperatures are involved when used in many electrical appliances. Examples of these appliances are irons, water heaters, electric stoves, ovens, frying pans, toasters, Washington cookie cutters, and the like. To avoid injury, such as burns, to people using these appliances, indicators are needed to tell people using these appliances that they are hot and must be careful. This high temperature indication is usually achieved with a temperature sensor, a control unit connected to this temperature sensor, and a warning light that lights up on the control unit when the sensor dete...

Claims

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