CN202854721U

CN202854721U - Mouse capable of effectively improving mechanical switch failure caused by increased contact resistance

Info

Publication number: CN202854721U
Application number: CN 201220563381
Authority: CN
Inventors: 温雪眉
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-10-26
Filing date: 2012-10-26
Publication date: 2013-04-03
Anticipated expiration: 2022-10-26

Abstract

A mouse capable of effectively improving mechanical switch failure caused by increased contact resistance comprises a mechanical switch and a mouse control circuit which is connected with the mechanical switch and used for receiving on-off signals of the mechanical switch. A metal oxide semiconductor (MOS) gate circuit is in serial connection between the mechanical switch and the mouse control circuit, one contact of the mechanical switch is connected with the logic input end of the MOS gate circuit, the logic output end of the MOS gate circuit is connected with an on-off signal input pin of the mouse control circuit, and the input resistance of the input end of the MOS gate circuit connected with the mechanical switch is not smaller than 50 megohms. The mouse has the advantages that when the contact resistance of the mechanical switch changes large, the mouse control circuit can still obtain right switch on-off signals, the control failure caused by increased contact resistance of the mechanical switch is effectively improved, and the service life of the mouse is prolonged.

Description

Effectively improve because contact resistance becomes and cause greatly the malfunctioning mouse of mechanical switch

Technical field

The utility model relates to the interior mechanical switch of the circuit structure of mouse, particularly mouse and the circuit connection structure between the mouse control circuit.

Background technology

Various mechanical switch is arranged in mouse, and the code switch of for example microswitch of left, center, right key, and roller, these mechanical switchs all exist because of contact wear or dirty former thereby cause the contact contact resistance to become large problem.In existing mouse circuit, mechanical switch all is directly to be connected with the control circuit of mouse, and control circuit is responsive to the change in resistance of the contact contact resistance of mechanical switch, for example, if contact resistance reaches 1 megohm, will cause controlling malfunctioning, directly affect thus serviceable life of mouse.

The utility model content

The purpose of this utility model provides a kind of can effectively the improvement because contact resistance becomes and causes greatly the malfunctioning mouse of mechanical switch.

The utility model is achieved in that effective improvement causes greatly the malfunctioning mouse of mechanical switch because contact resistance becomes, comprise mechanical switch and be connected with mechanical switch, in order to receive the mouse control circuit of mechanical switch on and off signal, between mechanical switch and mouse control circuit, be in series with the MOS gate circuit, a contact of mechanical switch is connected with the logic input terminal of MOS gate circuit, the logic output terminal of MOS gate circuit is connected with the switching signal input pin of mouse control circuit, the input end of the MOS gate circuit that connects from mechanical switch, the input impedance of this input end is not less than 50 megohms.

As preferred forms, described mechanical switch is single-pole double-throw switch (SPDT), this switch has a common port, a normally closed contact end and a normally opened contact end, and common port is connected with the logic input terminal of described MOS gate circuit, and other two tip sides connect respectively high level and low level.

The utility model has the advantages that: utilize the logic input terminal of MOS gate circuit to have the characteristics of high impedance, so that in the situation that the contact resistance of mechanical switch becomes very large, tens megohms for example, also can make reliably the logic output terminal of MOS gate circuit normally overturn, guaranteed that the mouse control circuit can access correct switch on and off signal, thereby the contact resistance change that has effectively improved because of mechanical switch causes controlling malfunctioning situation greatly, has prolonged the serviceable life of mouse.

Description of drawings

Fig. 1 is the electrical block diagram of the utility model embodiment one;

Fig. 2 is the electrical block diagram of the utility model embodiment two.

Embodiment

Embodiment one

Referring to Fig. 1, a kind of effective improvement causes the malfunctioning mouse of mechanical switch greatly because contact resistance becomes, and comprises mouse control circuit 1 and the mechanical switch K1 that is connected with the mouse control circuit.Mechanical switch K1 both can be the microswitch of the left, center, right key of mouse, also can be the code switch of roller.Between mechanical switch K1 and mouse control circuit 1, be in series with MOS gate circuit 2.The MOS gate circuit of present embodiment is a not gate.The contact of mechanical switch K1 is connected with the logic input terminal of MOS gate circuit 2, and the logic output terminal of MOS gate circuit 2 is connected with the switching signal input pin of mouse control circuit 1.From the input end of MOS gate circuit 2, the input impedance of this input end is not less than 50 megohms.

Utilize the logic input terminal of MOS gate circuit to have the characteristics of high impedance, even the contact resistance of mechanical switch K1 reaches tens megohms, also can make reliably the logic output terminal of MOS gate circuit 2 normally overturn, guarantee that mouse control circuit 1 can access correct switch on and off signal.

Embodiment two

Referring to Fig. 2, the mechanical switch K2 of present embodiment is single-pole double-throw switch (SPDT), and this switch has a common port 3, a normally closed contact end 4 and a normally opened contact end 5, and common port 3 is connected with the switching signal input pin of MOS gate circuit 2.The logic output terminal of MOS gate circuit 2 is connected with the switch contact access pin of mouse control circuit 1.The MOS gate circuit 2 of present embodiment also is a not gate.The normally closed contact end 4 of mechanical switch K2 is connected with the normally opened contact end that the two is appointed and to select one and be connected with high level, and the opposing party is connected with low level.From the input end of MOS gate circuit 2, the input impedance of this input end is not less than 50 megohms.The logic output terminal that this syndeton of single-pole double-throw switch (SPDT) can be controlled the MOS gate circuit more reliably normally overturns.

The mechanical switch K2 of present embodiment can be the microswitch of the left, center, right key of mouse.

The MOS gate circuit of above-mentioned two embodiment all is a simple not gate, but the utility model is not limited, for example, can adopt the more complicated gate circuit that is combined by various gate circuits such as Sheffer stroke gate or doors, as long as the input and output logical relation of whole gate circuit meets the control requirement of mouse.

MOS gate circuit described in the utility model can be CMOS gate circuit, PMOS gate circuit or NMOS gate circuit.

Mouse control circuit described in the utility model both can adopt special-purpose mouse control chip, also can adopt general single chip.

Mouse control circuit described in the utility model and MOS gate circuit both can be chips independently separately, also can be that the MOS gate circuit is integrated in the chip of mouse control circuit.

Claims

1. effectively improve because contact resistance becomes and cause greatly the malfunctioning mouse of mechanical switch, comprise mechanical switch and be connected with mechanical switch, in order to receive the mouse control circuit of mechanical switch on and off signal, it is characterized in that: between mechanical switch and mouse control circuit, be in series with the MOS gate circuit, a contact of mechanical switch is connected with the logic input terminal of MOS gate circuit, the logic output terminal of MOS gate circuit is connected with the switching signal input pin of mouse control circuit, the input end of the MOS gate circuit that connects from mechanical switch, the input impedance of this input end is not less than 50 megohms.

2. effective improvement as claimed in claim 1 causes greatly the malfunctioning mouse of mechanical switch because contact resistance becomes, it is characterized in that: described mechanical switch is single-pole double-throw switch (SPDT), this switch has a common port, a normally closed contact end and a normally opened contact end, common port is connected with the logic input terminal of described MOS gate circuit, and other two tip sides connect respectively high level and low level.