Wireless induction-type diaper and monitor device thereof

Abstract

The invention provides a wireless induction-type diaper and a monitor device thereof. The wireless induction-type diaper comprises a diaper and a frequency shift-type wireless radio-frequency identification label. The diaper is equipped with an absorption layer used for absorbing liquid. The frequency shift-type wireless radio-frequency identification label comprises a core and an antenna electrically connected with the chip. The antenna at least contains an extension antenna. In the normal state, the reading frequency band of the antenna is a reading frequency band deviating from the monitordevice. The antenna is arranged on the surface of base material capable of absorbing water. The extension antenna and the water-absorbing base material contact the absorption layer of the diaper. Thewater-absorbing base material can be wetted after the absorption layer absorbs urine or moisture. Therefore, a dielectric coefficient of the base material itself is changed. The reading frequency bandof the antenna deviates from that of the monitor device. Additionally, the monitor device sends notification information indicating that the diaper is wet by urine.

Description

technical field [0001] The invention relates to a diaper, especially a wireless inductive diaper equipped with a frequency-shifting radio frequency identification tag and its monitoring equipment, which can be read by the monitoring equipment after the diaper absorbs urine or water, and then issued by the monitoring equipment. The notification message indicates that the diaper is wet. Background technique [0002] Traditional diapers only have the function of absorbing urine or water, and do not have the function of proactively notifying that the diaper is wet. In addition, there is also a known diaper that can remind others that the diaper is wet by changing the appearance color of the diaper after absorbing urine or water; The paper diaper with detection function can be used with a radio frequency reader, and the paper diaper with sensing function includes: an absorbent pad, a sensing wire set and a radio frequency identification tag. The absorbent pad has two waist side...

AI Technical Summary

Problems solved by technology

The aforementioned another known technology I533857 utilizes when the diaper body is in a wet state, because the change of the dielectric coefficient of the waterproof layer of the diaper will cause the impedance value of the metal antenna to change accordingly, thereby causing the radio frequency tag to transmit The wavelength of the electromagnetic wave signal changes. Although this technical means is different from the known technology CN103845156, the radio frequency of the radio frequency tags currently used by the people is mostly in the ultra-high frequency band. The wavelength of high-frequency radio waves is small, and it is not easy to pass through water molecules. , so water molecules absorb electromagnetic waves in this frequency band, so that when the original normal UHF label is attached to the water-containing background material, the label antenna and water form a large absorber, so the antenna cannot effectively receive electromagnetic waves. At this time, the transmission distance will get very short

Therefore, when the aforementioned known technology I533857 utilizes the diaper body as a wet state, the reading distance of the metal antenna will change from long to long due to the change of the dielectric coefficient of the diaper’s waterproof layer itself and the influence of water absorbing ultra-high frequency electromagnetic waves. Short, which uses the change of the distance of the radio frequency tag from long to short when the diaper is wet to let the reader issue an alarm

As mentioned above, when the diaper is full of water, the water will absorb electromagnetic waves. However, the transmission distance will decrease at this time, which will cause the signal to disappear. Therefore, it is impossible to judge whether the interruption is caused by the full absorption of water or other factors. In addition, such Design, the reader can read the signal of the radio frequency tag at the beginning; because the reader will continue to receive signal processing, this will cause the reader chip to overheat quickly and affect the reading performance

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