Apparatus lid opening detecting device and detecting method

Abstract

This invention relates to machine cover open detecting device and the detecting method. It belongs to mechanical switch and electronic circuit field. Turn on and off salient point, mechanical switch and contact follow the cover open and close are set on the detecting device. The contact is connected to signal detecting storage circuit, initial state input and cover detecting output circuit are set in the storage circuit. The cover is determined whether it has been opened through output mouth level high and low. Computer storage information in the detecting device doesn't allow to be opened; it can be abstract by special using device. Device safe using and investigating after the cover is opened is easier. The circuit structure of the device is simple, cost is low. The device can be power supplied by secondary battery or external power supply, the battery is on charging state when external supply is used, so the battery using life is greatly prolonged, and the trouble of incessant changing battery is avoided. Battery low voltage comparison circuit is set to alarm low battery, and provide great convenience to consumer. It can be used to device detecting of tax control cashing machine and device familiar.

Description

(1) Technical field: [0001] The invention is a machine cover opening detection device and a detection method, in particular for the detection of the machine cover opening of a tax-controlled cash register and similar equipment in use. It belongs to the electric switch category (H01H) and the measurement electric variable category (G01R). (two) background technology: [0002] The existing lid opening and closing detection methods generally have the following types: ①Purely mechanical methods. ② Photoelectric detection method. ③ Electromagnetic detection method. ④Mechanical switch plus electronic detection method. Each method has its own characteristics and deficiencies. Generally, it is necessary to choose a suitable method according to the purpose of the function to be achieved by the tested equipment. [0003] A tax-controlled cash register or similar equipment that has been disclosed or is being developed operates in the following way: the cash register inputs data thr...

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Problems solved by technology

[0004] For the cover opening detection device required for the above-mentioned tax-controlled cash register or similar equipment, if a purely mechanical device is used, the structure will be complicated and the cost will be high

If a photoelectric detection device is used, the power consumption of the photoelectric switch will be large

The Chinese patent discloses that the name "rotation angle detection device" (02160466) is an electromagnetic detection method. Although the power consumption is lower than that of the photoelectric detection method, the device uses a magnetoresistive sensor and a connected CPU to perform steering control. Angle detection belongs to the field of angle measurement and is not suitable for the detection of the opening of the above-mentioned equipment of the present invention, and the electronic equipment is complex and expensive

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