CN101241396B

CN101241396B - Keyboard capable of locking key

Info

Publication number: CN101241396B
Application number: CN2007102001583A
Authority: CN
Inventors: 高政欣
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2007-02-06
Filing date: 2007-02-06
Publication date: 2012-05-23
Anticipated expiration: 2027-02-06
Also published as: CN101241396A

Abstract

A keyboard capable of locking keys comprises a plurality of keys, a keyboard control chip for controlling the operation states of the keys through programming and having GPIO pins, and a switch control circuit comprising a key locking switch button and a MOS switch transistor. A grid of the MOS switch transistor is connected to the key locking switch button. A source of the MOS switch transistor is connected to a voltage power supply. A drain of the MOS switch transistor is connected to the GPIO pins of the keyboard control chip. The key locking switch button can control the conduction or cut-off of the MOS switch transistor so as to change the electrical level status of the GPIO pins, thus the keyboard control chip with a program controls the plurality of keys to be locked or unlocked. The invention prevents the misoperation of staff and improves the operational reliability of the device.

Description

But the keyboard of locking key

Technical field

The present invention relates to a kind of keyboard.

Background technology

Keyboard is one of most important input equipment on server, workstation and the common personal computer.

At present, the part buttons such as numerical key on the keyboard that uses on server, workstation and the personal computer can be locked, but also have most of button not to be locked and constantly be in the triggering state.So, when some important operations or test formula are worked on computers,, be prone to cause said operation or test formula to interrupt suddenly because operating personnel can careless mistake bump button.So, then not only waste moves or the test duration, also possibly cause serious economy loss, thereby has reduced the reliability when this kind equipment uses.

Summary of the invention

In view of foregoing, but be necessary to provide a kind of keyboard of the locking key that can all lock to all buttons on the keyboard.

But the present invention provides a kind of keyboard of locking key; Comprise that the programming of plurality of keys, a usefulness controls said button and make state and have GPIO pin keyboard control chip and an ON-OFF control circuit; Said ON-OFF control circuit comprises a key-locking switch button and a MOS switching transistor; The grid of said MOS switching transistor is connected to said key-locking switch button; The source electrode of said MOS switching transistor is connected to a voltage source; The drain electrode of said MOS switching transistor is connected to the GPIO pin of said keyboard control chip, the conducting of the said MOS switching transistor of said key-locking switch button may command or be locked or unlock by make the keyboard control chip that is composed of program control said plurality of keys with the level state that changes said GPIO pin.

Compare prior art; But the keyboard of said locking key is through being applied to said ON-OFF control circuit on the said keyboard control chip; Make all buttons on the said keyboard all can under the situation of needs, be locked; Thereby prevented staff's maloperation, improved the reliability that this kind equipment uses.

Description of drawings

Combine embodiment that the present invention is done further description with reference to the accompanying drawings.

But Fig. 1 is the stereographic map of the preferred embodiments of the keyboard of the present invention's locking key.

But Fig. 2 is the partial circuit figure of the preferred embodiments of the keyboard of the present invention's locking key.

Embodiment

Please consult Fig. 1 and Fig. 2 jointly, but the preferred embodiments of the keyboard 10 of the present invention's locking key comprises a Keysheet module and an ON-OFF control circuit 30.Said Keysheet module comprises a keyboard body 22, is arranged at a plurality of keys 24 and a keyboard control chip 26 on the said keyboard body 22.Said keyboard control chip 26 is used for the duty of the said button 24 of programming Control; Said keyboard control chip 26 has general input and output (General-purpose I/O Port; Be GPIO) pin 262; Said GPIO pin 262 is the lock-out state pin of said button 24, and when said GPIO pin 262 received low level signal, said button 24 all was locked; Otherwise when said GPIO pin 262 received high level signal, said button 24 was disengaged locking and is in normal operating conditions.

Said ON-OFF control circuit 30 comprises a key-locking switch button 32, a switch control element Q, a pull-up resistor R0, a filter capacitor C1 and a resistance R 1.In preferred embodiments of the present invention, said key-locking switch button 32 adopts the tumbler switch button, and said switch control element Q adopts the P-MOS switching transistor.Said key-locking switch button 32 comprises one first pin 1, one second pin 2 and one the 3rd pin 3; Stir said key-locking switch button 32 said first and

second pin

1,2 or said second and third pin 2,3 are communicated with, first pin 1 of said key-locking switch button 32 is connected to the output terminal of a 3.3V voltage source, its 3rd pin 3 direct ground connection.The grid G (control end) of said switch control element Q is connected to second pin 2 of said key-locking switch button 32, and the grid G of said switch control element Q also is connected to the output terminal of said 3.3V voltage source behind said pull-up resistor R0; The source S of said switch control element Q directly is connected to the output terminal of said 3.3V voltage source, and the drain D (output terminal) of said switch control element Q is connected to the GPIO pin 262 of said keyboard control chip 26.Said filter capacitor C1 and resistance R 1 are parallel between the drain D and ground of said switch control element Q.

But the course of work of the keyboard 10 of said locking key is following: when computing machine stable operation program; But the key-locking switch button 32 of stirring the keyboard 10 of said locking key to the right is communicated with said first and

second pin

1,2; The grid G of then said switch control element Q (P-MOS switching transistor) is a high level; Because said switch control element Q is the P-MOS transistor; So end, the GPIO pin 262 of then said keyboard control chip 26 receives low level signal, has avoided maloperation thereby said button 24 is locked.When the formula operation finishes needs use keyboard; But the key-locking switch button 32 of stirring the keyboard 10 of said locking key left is communicated with said second and third pin 2,3; The grid G of then said switch control element Q is a low level; Said switch control element Q conducting, the GPIO pin 262 of drain D output high level signal to the said keyboard control chip 26 of said switch control element Q, then said button 24 all is disengaged locking and is in normal operating conditions.

In this preferred embodiments, but said key-locking switch button 32 is arranged at the place, dead zone, upper right side of the keyboard 10 of said locking key.Need to prove that said switch control element Q also can be the switching transistor or the on-off circuit of other form, like N-MOS switching transistor, triode etc.; Said key-locking switch button 32 also is not limited to above-mentioned tumbler switch.

But the keyboard 10 of the present invention's locking key is through being applied to said ON-OFF control circuit 30 on the said keyboard control chip 26; Make all buttons 24 of said Keysheet module 20 all can under the situation of needs, be locked; Thereby prevented staff's maloperation, improved the reliability that this kind equipment uses.

Claims

1. but the keyboard of a locking key; Comprise the keyboard control chip that plurality of keys and a usefulness are programmed and controlled said button duty and have the GPIO pin; It is characterized in that: but the keyboard of said locking key also comprises an ON-OFF control circuit; Said ON-OFF control circuit comprises a key-locking switch button and a MOS switching transistor; The grid of said MOS switching transistor is connected to said key-locking switch button; The source electrode of said MOS switching transistor is connected to a voltage source, and the drain electrode of said MOS switching transistor is connected to the GPIO pin of said keyboard control chip, the conducting of the said MOS switching transistor of said key-locking switch button may command or be locked or unlock by make the keyboard control chip that is composed of program control said plurality of keys with the level state that changes said GPIO pin.

But 2. the keyboard of locking key as claimed in claim 1, it is characterized in that: said key-locking switch button is the tumbler switch button, said key-locking switch button comprises one first pin, one second pin and one the 3rd pin; Stirring said key-locking switch button can make said first and second pin or said second and third pin be communicated with respectively; First pin of said key-locking switch button is connected to a voltage source; Second pin of said key-locking switch button is connected to the grid of said MOS switching transistor, the 3rd pin ground connection of said key-locking switch button.

But 3. the keyboard of locking key as claimed in claim 2, it is characterized in that: said ON-OFF control circuit also comprises a resistance, and said MOS switching transistor is a P-MOS switching transistor, and the drain electrode of said P-MOS switching transistor is also via said resistance eutral grounding.

But 4. the keyboard of locking key as claimed in claim 3, it is characterized in that: said ON-OFF control circuit also comprises a pull-up resistor, the grid of said P-MOS switching transistor also is connected to said voltage source behind said pull-up resistor.

But 5. the keyboard of locking key as claimed in claim 3, it is characterized in that: said ON-OFF control circuit further comprises a filter capacitor, said filter capacitor and said resistance are parallel between the drain electrode and ground of said P-MOS switching transistor.