Monitor with cleaning device
A technology for cleaning devices and monitors, which is applied in the field of monitors to achieve accurate and timely detection methods and prevent malfunctions
Active Publication Date: 2014-11-26
AUTOEASY ELECTRONICS TECH
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Problems solved by technology
Humidity sensors can't do that
Method used
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Embodiment Construction
[0035] Before describing the present invention in detail, prior art and working principle of the present invention are briefly described earlier:
[0036] Traditional capacitive sensors are based on parallel plate capacitors. Its principle is: if the edge effect of the non-uniform electric field is not considered, the capacitor composed of two parallel plates has a capacitance of
[0037]
[0038] In the formula, is the dielectric constant of the medium between the plates, is the dielectric constant in vacuum, is the dielectric constant of the medium relative to vacuum, and the relative dielectric constant of air other media is the area of the plate; d is the distance between the plates.
[0039] Due to the change of the measured medium, the relevant parameters of the capacitive sensor The change of S and d makes the capacitance C change accordingly. According to this, traditional capacitive sensors can be divided into three types according to the changes of...
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A monitor with a cleaning device comprises a casing, a monitoring component and a transparent cover, wherein the monitoring component is mounted in the casing, and the transparent cover is mounted at the front end of the casing and provided with a cleaning device and a plane capacitance type sensor controlling actions of the cleaning device. The plane capacitance type sensor comprises a main plane capacitance detector and a sensor detection circuit, the main plane capacitance detector is arranged on the inner surface of the transparent cover, and the sensor detection circuit is arranged in the casing. Two electrode plates of the main plane capacitance detector are arranged on the same plane, the sensor detection circuit and the main plane capacitance detector are electrically connected, the main plane capacitance detector is used as a sensitive element of the sensor, and the sensor detection circuit detects capacitance variations caused by affection of the environment and generates control signals to control the cleaning device according to the capacitance variations. The sensor is a built-in plane capacitance sensor, when rainwater falls on the plane capacitance sensor and affects capacitance, the sensor detection circuit can judge whether the rain falls according to the capacitance variations and controls the cleaning device to act, and detection way is accurate and timely.
Description
Technical field: [0001] The invention relates to a monitor, in particular to a monitor with a cleaning device. Background technique: [0002] When the monitor in the prior art is used for a long time or the rain and fog are heavy, water mist will appear on the glass at the front of the monitor head, thereby affecting the monitoring effect. In order to overcome this problem, in the prior art, a cleaning device is provided on the front cover of the monitor to scrape off the water mist or dust on the cover. However, this removal method is generally manually controlled remotely according to the monitoring effect. It is difficult to detect in time for automatic monitoring equipment. And, when it rains, the rainwater cannot be removed in time and accurately. In order to overcome the above problems, a detection method using a humidity sensor has appeared in the prior art, for example, CN201110040607.9 patent application for invention, the publication date is September 14, 2011, ...
Claims
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IPC IPC(8): G05B19/04B08B1/00G01D5/12G01W1/14
Inventor 孙滕谌
Owner AUTOEASY ELECTRONICS TECH