SU427329A1 - NON-CONTACT KEY - Google Patents

Description

one

The proposed key is intended for manual entry of information, for example, into communication channels, computing, measuring and printing devices, into various automation systems.

The key can be used in computing, telegraphy, typewriting, instrument making, / both as a separate module, and as a custom of these keyboard modules.

Known keys of a similar purpose are constructed by capacitive, photoelectric, and magnetically sensitive operating principles. There are also keys in which the magnetically sensitive element (Hall sensor, magnetoresistor) changes its electrical parameters depending on the induction of the magnetic field acting on it.

In such keys, obtaining a sufficient induction differential acting on the magnetic element, due to structural and technological difficulties, and the presence of a return spring significantly reduces the reliability and durability of the device.

In order to simplify the construction, increase the safety and durability of work and reduce the size, a non-contact key is offered, in the kite of which the magnetic system is broken, consisting of a stationary ferromagnetic sterile and a mobile standing magnet. The latter is made in the form of a roller and placed in transverse guide bodies. The movable magnet has the ability to move in the direction perpendicular to the axis of the device when interacting with the angled bevel of the shank of the keyboard head.

FIG. 1 shows a device in longitudinal section; in fig. 2 - (section on L-L and a fig. 1.

A ferromagnetic rod (for example, a permanent magnet 2) is fixed in a diamagnetic case / and a permanent magnet 3, made, for example, in the form of a roller, which is not limited from movement in the (direction, transverse pendicle The device axes are magnetized along the axis and are located on one side with the ion-polar poles and the ends of the magnets, which ensures that the mobile magnet 5 is attracted to the stationary 2.

Between the magnets 2 and the longitudinal guides of the housing are placed the shank 4 of the button head 5, provided with an angular bevel 6, facing the movable magnet and ensuring its movement. The magnetically sensitive element 7 is installed in the housing at the end of the movable magnet (Fig. 2).

The housing is equipped with a cavity for accommodating electronic circuit elements.

On the keyboard, the proposed key is shown in the initial (starting) position, in which the MOBILE magnet is tritted to the stationary magnet, and the head 5 is in the uppermost position.

When pressing the knob 5, the shank 4 moves. Along the axis of the device and by its angular bevel 6 moves the movable magnet, approx. Its end face to the magnetosensitive element 7.

After removing the force, the interaction force MarHHtoiB moves. (Rolls) the movable magnet towards the stationary. In this case, the movable magnet acts on the angular bevel 6, removes the shank, and the key on the head occupies the initial (starting) position. In the starting position, the movable magnet is pressed to the out-of-motion, providing the key with vibration resistance and creating for the operator the so-called effect of the feeling of the initial state.

Subject invention

A contactless key comprising a housing, a magnet system, a magnetically sensitive element and a key head, characterized in that, in order to simplify the design and increase its reliability, the small-size system is IB as a freely installed direct magnet guide with the angular bevel of the tail part of the keyhead, and a ferromagnetic rod, made in the form of a permanent magnet, rigidly fixed, in the case and positioned with their poles opposite to the poles of the movable Agnita.