JPH0351870Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a key switch, and particularly to a code switch configured to output a coded switch signal when a key is operated.

(b) Prior art In general, in keyboards equipped with a large number of key switches, in order to associate numbers or letters with each key switch, a separate coding circuit B is connected to each switch contact A as shown in Figure 1. It is used so that it is output as a code signal corresponding to the switch, that is, the output signal of each switch is given weight. Therefore, this type of device has the inconvenience of requiring a separate encoding circuit.

(c) Purpose of the invention This invention was proposed in view of the above points, and by incorporating a coding structure into each key switch, the switch signal can be weighted and output in advance. The present invention aims to provide a cord switch that is easy to use for keyboards, is easy to assemble during manufacture, and is inexpensive.

(d) Structure of the invention This invention provides a key operation section of a key switch with a plurality of magnet accommodating sections each having a weight for setting a code, and a magnet accommodating section selected according to a desired code signal. A magnetically sensitive switch element such as a reed switch is installed in the opposite part of the magnet accommodating part when the key operation part is pressed, and when the key operation part is pressed. This is a code switch which is capable of sending out an output signal from a magnetically sensitive switch element in accordance with a desired code signal.

(e) Embodiments Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram of the code switch S according to this invention. In the figure, reference numeral 1 denotes a key operation unit, which is equipped with a key top 1a and an operating rod 1b.
It is possible to push the button up and down. A protrusion 1c is provided around a part of the operating rod 1b.
Four magnet accommodating portions 1 _C0 to 1 _C3 are formed in the magnet accommodating portions 1 C0 to 1 C3, each of which is given a weight for code setting. In this example, a 4-bit binary code is set as an example, so a weight of "×2 ⁰ " is assigned to magnet housing 1 _C0 , and similarly, magnet housing 1
_C1 has a weight of “×2 ¹ ”, magnet accommodating portion 1 _C2 has a weight of “×2 ² ”, and magnet accommodating portion 1 _C3 has a weight of “×2 ³ ”.
The weight is given as follows. When the key operation section 1 is pushed downward with a finger, reed switches 41 to 44 are respectively installed at opposing positions of the magnet housing sections _1C0 to _1C3 . Note that these reed switches 41 to 44 can be replaced with other magnetically sensitive switch elements. In addition, output terminals 41a, 41b, 42 are connected to the outside from the switch case 3 from the reed switches 41 to 44, respectively.
a, 42b, 43a, 43b, 44a, 44b are extended. Note that the output terminals 41b, 42b, 4
3b and 44b can also be commonly connected within the switch case 3 to form a common terminal.

In such a code switch S, a code is set by selectively accommodating a required number of code setting magnets 5 in the magnet accommodating portions _1C0 to _1C3 according to the weights assigned to each magnet. Therefore, when the key operating section 1 is pressed, only the reed switch located at the opposite portion of the magnet accommodating section in which the code setting magnet 5 is housed is switched on, and a switch signal is sent out as a code signal as set. That will happen. Therefore, the code setting can be easily performed by simply changing the arrangement of the magnets 5 accommodated in the magnet accommodating portions 1 _C0 to 1 _C3 . Note that when the code setting is fixed, it is advantageous in terms of cost to eliminate reed switches that are not set.

(f) Effect of the invention This invention is configured so that the switch signal is sent as a code signal as described above, so there is no need to add a coding circuit outside the key switch, and it can be used as a code switch for keyboards, etc. It's good to use. In addition, a code setting magnet is housed in a detachable manner, and a plurality of magnet accommodating parts are provided, each with a weight for code setting, and a desired code signal can be sent out simply by changing the arrangement of the magnets, so the unit can Only one type is required, assembly is easy during production, and the cost is low.

[Brief explanation of the drawing]

Fig. 1 is an example of a conventional circuit that encodes and sends a switch signal, Fig. 2 is a schematic diagram of the code switch according to this invention, and Fig. 3 shows its output circuit,
FIG. 4 shows another output circuit embodiment. S...Code switch, 1...Key operation section, 1
a...Key top, 1b...Operating rod, 1 _C0 to 1 _C3
... Magnet housing section, 41 to 44 ... Reed switch, 5 ... Code setting magnet.

Claims (1)

[Scope of utility model registration request] A key operation section and a plurality of magnet accommodating sections that can detachably house code setting magnets in conjunction with the key operation section and each have a weight for code setting are provided, and the key operation section is pushed. In this state, a magnetically sensitive switch element is installed at a portion facing the magnet accommodating section, and a required number of code setting magnets are accommodated in the magnet accommodating section according to their respective weights, and a desired code signal is applied to the magnetically sensitive switch element. A code switch characterized in that it is configured to send out an output signal.