SU997023A1

SU997023A1 - Contact-free key

Info

Publication number: SU997023A1
Application number: SU802967609A
Authority: SU
Inventors: Владимир Филиппович Лярский; Валентина Константиновна Перфилова; Владимир Яковлевич Антонов; Александр Павлович Земсков; Владимир Николаевич Таиров; Владимир Олегович Щербина; Анатолий Иванович Рухлин
Original assignee: Предприятие П/Я В-8543
Priority date: 1980-08-04
Filing date: 1980-08-04
Publication date: 1983-02-15

Description

Изобретение относитс к автоматике и вычнстщтельной техник и может быть применено в устройствах, где используетс импульсный управл ккоий сигнал, возникающий при нажатии на клавишу, в частности в электронных клавишных вычислительных машинах.The invention relates to automation and computing technician and can be applied in devices that use a pulse control signal that occurs when you press a key, in particular in electronic keyboard computing machines.

Известно устройство дл . ввода информации, которое содержит электретную пленку, расположенную между первым электродом, закрепленным на диэлектрической плате, и вторым подвижным электродом. В таком устройстве дл обеспечени посто нной скорости подвижного электрода используют посто нный магнит t13.A device is known for. input information, which contains an electret film located between the first electrode, mounted on a dielectric plate, and the second movable electrode. In such an apparatus, a permanent magnet t13 is used to provide a constant speed of the moving electrode.

Недостатком данного устройства вл етс наличие большого количества деталей, что ведет к у;9еличению габарита и веса, а использование магнита может привестик нежелательному изменению импульса из-за изменени скорости, -которое происходат в результате старени магнита и воздействи , внешних магнитных полей7The disadvantage of this device is the presence of a large number of parts, which leads to the increase in size and weight, and the use of a magnet can lead to an undesirable change in impulse due to a change in speed, which occurs as a result of aging of the magnet and the effect of external magnetic fields7

Известно устройство, включающее в себ неподвижный электрод, выполненный на печатной плате, электрет, расположенный на неподвижном электроде , подвижный электрод и клавишу.A device comprising a fixed electrode formed on a printed circuit board, an electret located on a fixed electrode, a movable electrode, and a key are known.

Подвижный электрод выполнен в форме мембраны, котора опираетс своими крайними точками на токопровод щую шайбу, выполненную на печатной плате.гКлавиша св зана с толкателем, нижний конец которого расположен на. подвижном электроде (мембране) С2.The movable electrode is made in the form of a membrane, which, at its extreme points, rests on a conductive washer formed on a printed circuit board. The key is connected to a pusher, the lower end of which is located on. movable electrode (membrane) C2.

Недостатками известного устройства вл ютс сложность и ненадежность The disadvantages of the known devices are the complexity and unreliability

10 токоотвода с подвижного электрода (мембраны) и необходимость приложени довольно большого усили дл i срабатывани мембраны, что снижает надежность устройства.10 of the current collector from the moving electrode (membrane) and the need to apply a fairly large force for the response of the membrane, which reduces the reliability of the device.

1515

Наиболее близкой по технической сущности к предлагаемому вл)|етс бесконтактна клавиша, содержаща клавишную головку с выступом, установленную в направл ющих корпуса, . The closest to the technical essence of the proposed Vl) | is a contactless key containing a key head with a protrusion installed in the body guides,.

20 основание которого выполнено из диэлектрического материгша, неподвижный электрод с расположенным на нем электретом и т Ьдвижный электрод , закрепленные на основании корпу25 са. Подвижный электрод выполнен в . виде пластины, по оси симметрии которой с одной стороны выполнен V-образный вырез, а с противоположной стороны - прорезь, концы пластины 20 whose base is made of a dielectric material, a fixed electrode with an electret located on it and a fixed electrode mounted on the base of the body. The movable electrode is made in. as a plate, on the axis of symmetry of which, on one side, a V-shaped cut is made, and on the opposite side, a slot, the ends of the plate

Claims

The 30 of the y-shaped notch is fixed and spring-loaded, with the plate facing a convex surface towards the stationary electrode, and under the middle part of the plate on the base a stop is placed. However, such a key is characterized by low reliability due to the non-stability of the signal, since it is difficult to obtain identical parts and clearances on which the mobile electrode depends on this design. The aim of the invention is to increase reliability. The goal is achieved by the fact that in a contactless key comprising a housing, a fixed electrode / formed at the base of the housing, an electret film located on a fixed electrode, a movable electrode, a pusher and a head connected to the pusher, the movable electrode is in the form of an elastic plate. In the form of an arch, one end of which is located, and the other is raised and secured at the base of the body, the elastic plate is made in the shape of an arch, an opening is made in the elastic plate at the end fixed at the base of the body, m aperture has a U-shape facing to the fixed end in osnovanii.korpusa elastic plate. Figure 1 shows a contactless key, a general view; Fig. 2 shows the structure of a moving electrode, isometric view. The contactless key consists of; base 1 with a stationary electrode 2 mounted on it. Electret film 3 is located on the stationary electrode 2. The movable electrode 4 is an elastic plate having the shape of an arch. One side of the movable electrode 4 is lifted above the base 1 and fixed to its live part / connected to one of the leads 5. On the base 1, a body 6 is installed, in the guides of which the pusher 7 moves with the key head 8 fixed on it, the pusher 7 is spring-loaded A return spring 9, an elastic plate 4, on the side fixed to the current-carrying part of the base 1, has an opening 10, which is U-shaped. The device works as follows. When an external force is applied, the keyboard 8, moving in the direction of the body b, transmits the force through the pusher 7 to the elastic plate 4, the elastic plate 4, c. the turn, the stability, changes its shape dramatically in the direction of the stationary electrode 2 and spreads across electret 3. When an elastic plate 4 (mobile electrode) moves in the electric field of electret 3, electrodes 4 and 2 undergo a change in induced charges; As a result, a current pulse appears in the external circuit, which causes a voltage pulse to appear on the load. When the elastic plate 4 is flattened on the electret 3 (hd button until it stops), the signal pulse on the load is zero. The return of the elastic plate 4 to its original position occurs when the load is relieved by means of a return spring 9 or due to the elastic properties of the plate. The proposed design of the movable electrode is characterized by good repeatability of dimensions during mass production and does not require additional operations during assembly. Thus, the stability of the signal is ensured, which increases the reliability of the key operation. In addition, this device does not require much effort to operate, and the speed and working surface of the moving electrode is sufficient to produce a pulse of the order of 1-30 V with a load of 1-10 MΩ. Such a pulse can be controlled without further effort. Claim 1. Non-contact key comprising a housing, a fixed electrode formed at the base of the housing, an electret film disposed on the fixed electrode, a movable electrode, a pusher and a head connected to the pushrod, in order to improve reliability keys, the movable electrode is made in the form of an elastic plate in the form of an arch, one end of which is located, and the other is raised and fixed at the base of the body. 2. The key according to claim 1, that is, so that in the elastic plate at the end fixed at the base of the body, a hole is made. 3, A key according to claim 2, about a tol yu and Yush-i so that the hole has a U-shape, facing the end of the elastic plate fixed at the base of the body. Sources of information taken into account during the examination 1. USSR author's certificate No. 510797, cl. G About R 3/02, 1974.

2. US patent number 3653038, cl. 340-365, published, 1972,

3. USSR Author's Certificate No. 847311, class G 06 F 3/02, 1979 (prototype),