Shortsightedness-preventing book fixing device

Abstract

The invention relates to a shortsightedness-preventing book fixing device. The device is fixed to a book through two clamps, a support is connected with a sliding rod through pulleys, and a distance detector, a relay and a sounder are fixed to the support. After detecting an obstacle, the distance detector sends a signal to the relay, after the relay receives the signal, a circuit of the sounder is connected, the sounder gives an alarm, when not detecting the obstacle, the distance detector stops transmitting the signal to the relay, the circuit of the sounder is disconnected by the relay, and alarm sound is stopped. The shortsightedness-preventing book fixing device has the advantages that the device is installed on the book instead of the human body, and no load is caused to the human body. When the head is too close to the book, the device will give the alarm continuously, and when the distance between the head and the book is larger than set distance, the alarm is stopped. The distance between the two clamps can be adjusted, and the device is suitable for books in various sizes. A button cell is adopted for power supply and is low in weight and small in size.

Description

technical field [0001] The invention belongs to a book fixing device, in particular to a book fixing device with myopia prevention reminder. Background technique [0002] When children read and write, the distance between the book and the head is required to be 1 meter (that is, 33cm). If the distance is too close, it may cause myopia of the eyes. Therefore, the posture of reading and writing is very important. However, because children are naturally active and have poor control, it is impossible to maintain a good learning posture all the time. Moreover, when children concentrate on reading, they will be attracted by the plot in the book, and will unconsciously approach the book, unable to complete the book and head. Keep the requirement of more than 1 meter at all times. Now the incidence of myopia in children is constantly increasing, and it is difficult for children to consciously control it due to their own reasons, and it is obviously unrealistic to rely on parents' c...

AI Technical Summary

Problems solved by technology

Although there are some devices on the market that meet the above requirements, such as anti-myopia reminder glasses, anti-myopia reminder earmuffs, etc., these devices need to be worn by children, which will cause a burden on children's bodies, and children are unwilling to wear them.

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