CN1302690C - ESD protection device and tactile keys with ESD protection - Google Patents

Abstract

The present invention provides an electrostatic discharge protection device, which can protect a touch key module. The touch key module at least has a circuit substrate, a key unit and a key marking panel. An insulating sleeve and a conductive plate are used to isolate and discharge static electricity to protect the touch key module. Thus, a touch key module with electrostatic discharge protection capability and an electronic device using the key module are provided.

Description

ESD protection device and tactile keys with ESD protection

technical field

The invention relates to an electrostatic discharge protection device, in particular to an electrostatic discharge protection device suitable for a touch key module.

Background technique

Electrostatic discharge (Electrostatic Discharge, hereinafter referred to as ESD) is ubiquitous in the measurement, assembly, installation and use of integrated circuits, which may cause damage to integrated circuits and indirectly affect the functions of electronic systems. However, the most common causes of ESD stress are the following three models: (1) human body model: the model defined by the US Military Standard No. 883 Method 3015.6 (MIL-STD-883, Method 3015.6) , which represents the ESD stress caused when the static electricity carried by the human body touches the pins of the integrated circuit. (2) Machine model: The ESD stress caused by the static electricity of the machine touching the pins of the integrated circuit is measured according to the existing industry standard EIAJ-IC-121 method 20. (3) Charge device model: In the subsequent process, the integrated circuit with the original charge contacts the grounded conductive substance, thus forming an ESD pulse path for the integrated circuit.

Most electronic products will be in an ESD environment 99% of the time in their life cycle, and ESD disturbances can cause the device to lock up, restart, lose data or reduce reliability. In the destruction of ESD, static electricity will cause devastating damage to I/O ports, which may cause data bit ghosting, product damage, and hardware failure of electronic equipment or damage to components.

The most obvious effect of ESD damage is component failure, where a sudden discharge of static electricity from a finger or other conductor can destroy static-sensitive components or microcircuits. An electronic component at risk of electrostatic discharge may be completely unaffected, or damaged but not immediately noticeable, but its life expectancy may be reduced due to intermediate degradation, which is a potential equipment operation failure. ESD events degrade components and cause failure during continued use. ESD damage can be cumulative, causing the damaged components to function intermittently, and this type of failure has a certain degree of concealment. Another important impact of ESD is the interference with operating equipment. The energy transmitted and emitted by the ESD event can be mistaken for valid data by the operating system, causing temporary errors during data transmission. cause malfunction or damage to electronic components.

Since touch switches are widely available in the market, there is no good solution to the impact of ESD. Therefore, it is quite appropriate to prevent the accumulation of electrostatic charges to avoid the generation of ESD.

Contents of the invention

The main purpose of the present invention is to provide an electrostatic discharge protection device, in particular to an electrostatic discharge protection device suitable for a touch key module, so as to solve the above problems.

The purpose of the present invention is achieved by providing an electrostatic discharge protection device for protecting a touch key module, the touch key module at least has a circuit substrate, a key unit and a key label panel, the above-mentioned The button unit passes through the above-mentioned button label panel and protrudes from the button label panel. The above-mentioned electrostatic discharge protection device includes: an insulating sleeve, which is arranged between the above-mentioned button unit and the above-mentioned circuit substrate, and covers a part of the above-mentioned button unit, It is used to isolate the static electricity on the above-mentioned key unit from the above-mentioned circuit substrate. The above-mentioned key unit is defined as a first key part by the part covered by the insulating sleeve, and the above-mentioned key unit is not defined by the part covered by the insulating cover as a second part. The key part; and a conductive flat plate, which is arranged between the above-mentioned circuit substrate and the above-mentioned key marking panel, the above-mentioned conductive flat plate has at least one hollow part, so that the above-mentioned second key part passes through the above-mentioned hollow part, and the hollow part of the above-mentioned conductive flat plate The part has an inner edge, and there is a distance between the inner edge and the button unit, and the insulating cover has a creepage distance, and the creepage distance is larger than the distance, when a user touches the button unit, the touch-sensitive A static electricity is generated in the button module, and the above-mentioned conductive plate is used for deriving the above-mentioned static electricity.

The present invention provides a touch key module with electrostatic discharge protection capability, comprising: a circuit substrate; a key unit; a key marking panel, the key unit passes through the key marking panel and protrudes from the key marking panel ; an insulating sleeve, arranged between the above-mentioned key unit and the above-mentioned circuit substrate, and covering a part of the above-mentioned key unit, for isolating the static electricity on the key unit from the above-mentioned circuit substrate, and the above-mentioned key unit is covered by the insulating sleeve It is defined as a first button part, and the above-mentioned button unit is not defined as a second button part by the part covered by the insulating sleeve; The flat plate has at least one hollow part, so that the above-mentioned second button part is set through the above-mentioned hollow part, the hollow part of the above-mentioned conductive flat plate has an inner edge, and there is a distance between the inner edge and the above-mentioned key unit, and the above-mentioned insulating cover has A creepage distance. The creepage distance is greater than the distance. When a user touches the key unit, a static electricity is generated in the touch key module. The conductive plate is used to discharge the static electricity.

The present invention also provides an electronic device, at least having a touch key module with electrostatic discharge protection capability, including: a main body; a touch key module disposed in the main body; wherein, the touch key module is at least It has a circuit substrate, a button unit and a button label panel, the button unit passes through the button label panel and protrudes from the button label panel; an insulating sleeve is arranged between the button unit and the circuit substrate, and A part of the above-mentioned key unit is covered to isolate the static electricity on the key unit from the above-mentioned circuit substrate, and the above-mentioned key unit is defined as a first key part by the covering part of the insulating cover, and the above-mentioned key unit is not covered by the insulating cover The covering part is defined as a second button part; and a conductive plate, which is arranged between the above-mentioned circuit substrate and the above-mentioned button label panel, and the above-mentioned conductive plate has at least one hollow part, so that the above-mentioned second key part passes through the above-mentioned hollow part It is provided that the hollow part of the above-mentioned conductive plate has an inner edge, and there is a distance between the above-mentioned inner edge and the above-mentioned key unit, and the above-mentioned insulating cover has a creeping distance, and the above-mentioned creeping distance is greater than the above-mentioned distance, when a user touches the The button unit generates a static electricity in the touch button module, and the conductive plate is used for deriving the static electricity.

To sum up, in order to achieve the above purpose, the present invention provides an electrostatic discharge protection device for protecting a touch key module. The touch key module at least has a circuit substrate, a key unit and a key label panel. The key unit is arranged on the circuit substrate and has a first part and a second part. The second part passes through the key marking panel and protrudes from the key marking panel.

The electrostatic discharge protection device includes an insulating sleeve and a conductive plate, the insulating sleeve is arranged between the key unit and the circuit substrate, and covers the first part of the key unit, and uses the insulating property to isolate the static electricity on the key unit from the circuit substrate, so as to Avoid static electricity passing through the path of the key unit to damage the circuit substrate and components on the substrate.

A conductive flat plate is arranged between the circuit substrate and the button marking panel. Its conductive property is used as the shortest discharge path. Because the conductive flat plate itself has at least one hollow part, the second part can pass through the hollow part.

When a user touches the key unit to generate static electricity in the touch key module, the conductive plate utilizes its conductive property to guide the static electricity to the reference ground, so as to avoid system or equipment damage or malfunction.

Description of drawings

FIG. 1 is a schematic diagram of a touch key module 1 with electrostatic discharge protection capability according to a first embodiment of the present invention;

2 is a top view of the touch key module 1 with electrostatic discharge protection capability according to the first embodiment of the present invention;

3 is a side view of the touch key module 1 with electrostatic discharge protection capability according to the first embodiment of the present invention;

FIG. 4 is a schematic diagram of a liquid crystal display with an electrostatic discharge protection touch key module according to a second embodiment of the present invention.

Detailed ways

FIG. 1 is a schematic diagram of a touch key module 1 with electrostatic discharge protection capability according to the present invention. As shown in FIG. 1 , an insulating sleeve 30 is disposed between a key unit 20 and a circuit substrate 50 , and covers the first portion 201 of the key unit 20 . A conductive flat plate 10 is disposed between the circuit substrate 50 and a key marking panel 40 . The key unit 20 also includes a second portion 202 . The conductive plate 10 has at least one hollow portion, so that the second portion 202 of the key unit 20 not covered by the insulating sleeve 30 can pass through the above hollow portion.

The working principle of the touch button module of the present invention is as follows. The insulating cover 30 is disposed between the key unit 20 and the circuit substrate 50 , and covers the first portion 201 of the key unit 20 to isolate the static electricity on the key unit 20 from the circuit substrate 50 . A conductive flat plate 10 is arranged between the circuit substrate 50 and the key label panel 40 to guide static electricity to a reference ground GND. The conductive flat plate 10 has at least one hollow part so that the key unit 20 is not covered by the insulating sleeve 30 The covered second portion 202 passes through the hollow portion and protrudes from the button identification panel 40 .

FIG. 2 shows a top view of the above-mentioned touch key module 1 . FIG. 3 shows a side view of the touch key module 1 along the direction 3-3'. As shown in FIG. 2 , the hollow portion of the conductive plate 10 has an inner edge, and there is a distance D between the inner edge and the key unit 20 , and the distance D must be less than 1 mm. As shown in FIG. 3 , the insulating sleeve 30 has a creepage distance S, and the creepage distance S needs to be greater than the distance D, for example, the creepage distance S is twice or more than the distance D.

When a user touches the key unit 20 , static electricity may be generated on the key unit 20 . When the static electricity is generated, the insulating cover 30 can isolate the static electricity on the key unit from the circuit substrate 50 . In addition, because the distance D between the inner edge of the hollow part of the conductive plate 10 and the key unit 20 is less than 1mm, and the creeping distance S of the insulating sleeve 30 is greater than twice the distance D, static electricity can be directly guided from the conductive plate 10 to a reference ground GND or the chassis to form the shortest path for discharge, thereby protecting the key unit 20 and the circuit substrate 50 . Various electronic products, such as mobile phones, liquid crystal displays, personal digital assistants (PDAs), etc., can use the above design to protect the touch key module, thereby protecting the peripheral electronic components.

FIG. 4 is a schematic diagram of a liquid crystal display equipped with an electrostatic discharge protection touch key module according to the present invention. As shown in FIG. 4 , a touch key module 1 is disposed in a liquid crystal display 60 . The touch key module 1 has a circuit substrate 50, which contains the control function of the liquid crystal display 60; a key unit 20, which cooperates with the circuit substrate 50 to control the liquid crystal display 60; control function. An insulating cover 30 is arranged between a key unit 20 and a circuit substrate 50, and covers the first part 201 of the key unit 20, in order to isolate the static electricity on the key unit 20 from the circuit substrate 50, so that the static electricity will not flow from the key unit 20 enters the circuit substrate 50 and causes the circuit substrate 50 to be damaged. A conductive flat plate 10 is disposed between the circuit substrate 50 and a key marking panel 40 . The conductive plate 10 has at least one hollow portion, so that the second portion 202 of the key unit 20 not covered by the insulating sleeve 30 can pass through the hollow portion and protrude from the key label panel 40 .

The hollow portion of the conductive plate 10 has an inner edge, and there is a distance D between the inner edge and the key unit 20, and the distance D must be less than 1mm. The insulating sleeve 30 has a creepage distance S, and the creepage distance S needs to be greater than the distance D, for example, the creepage distance S is twice or more than the distance D. When a user touches the above-mentioned key unit 20, a static electricity may be generated on the key unit 20. When the static electricity is generated, the distance S along the surface of the insulating cover 30 is greater than twice the inner edge of the hollow part of the conductive plate 10 and the key unit 20. Under the condition of the distance D, the static electricity can be directly guided to the reference ground GND or the chassis through the conductive plate 10, and become the shortest discharge path, thereby protecting and preventing the liquid crystal display 60 from being damaged due to the touch key module Faulty or damaged peripheral components.

In summary, the present invention has the following advantages:

In the present invention, an insulating sleeve is arranged between a circuit substrate and a key unit, and covers a part of the key unit. Due to the function of the insulating cover, the static electricity of the key unit can be isolated from the circuit substrate, and a conductive plate can be used to guide the static electricity on the key unit to the reference ground or the chassis. In terms of cost, only adding an insulating sleeve and a conductive plate will naturally increase its economic benefits. In terms of function, it can even achieve the effect of completely eliminating static electricity.

Although the present invention has been disclosed in conjunction with the above two preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The protection scope of the invention shall be defined by the claims.

Claims (15)

1. electrostatic discharge protective equipment; in order to protect a touch-controlled key module; above-mentioned touch-controlled key module has a circuit substrate, a push-button unit and a button at least and indicates panel; above-mentioned push-button unit passes above-mentioned button sign panel and protrudes from this button and indicates on panel, and above-mentioned electrostatic discharge protective equipment comprises:

One insulating case, be arranged between above-mentioned push-button unit and the foregoing circuit substrate, and coat the part of above-mentioned push-button unit, in order to static on the above-mentioned push-button unit and foregoing circuit substrate isolates, above-mentioned push-button unit is defined as one first button part by this insulating case covered section, and above-mentioned push-button unit is not defined as one second button part by this insulating case covered section; And

One conductive plate, being arranged at foregoing circuit substrate and above-mentioned button indicates between the panel, above-mentioned conductive plate has at least one hollow-out parts, make above-mentioned second button partly pass above-mentioned hollow-out parts, the hollow-out parts of above-mentioned conductive plate has an inner edge, and has a spacing between above-mentioned inner edge and the above-mentioned push-button unit, above-mentioned insulating case has a creepage distance, above-mentioned creepage distance is greater than above-mentioned spacing, when a user touches this push-button unit and produce a static in above-mentioned touch-controlled key module, this above-mentioned conductive plate is in order to derive above-mentioned static.

2. electrostatic discharge protective equipment as claimed in claim 1, wherein, above-mentioned conductive plate also couples one with reference to ground connection, and static is emitted with reference to ground connection via above-mentioned.

3. static discharge Bao Zhi device as claimed in claim 2, wherein, above-mentioned is a chassics earth with reference to ground connection.

4. electrostatic discharge protective equipment as claimed in claim 1, wherein, above-mentioned spacing is less than 1mm.

5. electrostatic discharge protective equipment as claimed in claim 1, wherein, the creepage distance of above-mentioned insulating case is at least two times of above-mentioned spacing.

6. touch-controlled key module with electrostatic discharge (ESD) protection ability comprises:

One circuit substrate;

One push-button unit;

One button indicates panel, and above-mentioned push-button unit passes above-mentioned button sign panel and protrudes from this button and indicates on panel;

One insulating case, be arranged between above-mentioned push-button unit and the foregoing circuit substrate, and coat the part of above-mentioned push-button unit, in order to static on the push-button unit and foregoing circuit substrate isolates, above-mentioned key unit is defined as one first button part by this insulating case covered section, and above-mentioned key unit is not defined as one second button part by this insulating case covered section; And

One conductive plate, being arranged at foregoing circuit substrate and above-mentioned button indicates between the panel, above-mentioned conductive plate has at least one hollow-out parts, make above-mentioned second button partly pass above-mentioned hollow-out parts setting, the hollow-out parts of above-mentioned conductive plate has an inner edge, and has a spacing between above-mentioned inner edge and the above-mentioned push-button unit, above-mentioned insulating case has a creepage distance, above-mentioned creepage distance is greater than above-mentioned spacing, when a user touches this push-button unit and produce a static in above-mentioned touch-controlled key module, this above-mentioned conductive plate is in order to derive above-mentioned static.

7. key-press module as claimed in claim 6, wherein, above-mentioned conductive plate also couples one with reference to ground connection, and static is emitted with reference to ground connection via above-mentioned.

8. key-press module as claimed in claim 7, wherein, above-mentioned is a chassics earth with reference to ground connection.

9. key-press module as claimed in claim 6, wherein, above-mentioned spacing is less than 1mm.

10. key-press module as claimed in claim 6, wherein, the creepage distance of above-mentioned insulating case is at least two times of above-mentioned spacing.

11. an electronic installation has the touch-controlled key module of an electrostatic discharge (ESD) protection ability at least, comprising:

One main body;

One touch-controlled key module is arranged in the aforementioned body;

Wherein, above-mentioned touch-controlled key module has a circuit substrate, a push-button unit and a button at least and indicates panel, and above-mentioned push-button unit passes above-mentioned button sign panel and protrudes from this button and indicates on panel;

One insulating case, be arranged between above-mentioned push-button unit and the foregoing circuit substrate, and coat the part of above-mentioned push-button unit, in order to static on the push-button unit and foregoing circuit substrate isolates, above-mentioned key unit is defined as one first button part by this insulating case covered section, and above-mentioned key unit is not defined as one second button part by this insulating case covered section; And

One conductive plate, being arranged at foregoing circuit substrate and above-mentioned button indicates between the panel, above-mentioned conductive plate has at least one hollow-out parts, make above-mentioned second button partly pass above-mentioned hollow-out parts setting, the hollow-out parts of above-mentioned conductive plate has an inner edge, and has a spacing between above-mentioned inner edge and the above-mentioned push-button unit, above-mentioned insulating case has a creepage distance, above-mentioned creepage distance is greater than above-mentioned spacing, when a user touches this push-button unit and produce a static in above-mentioned touch-controlled key module, this above-mentioned conductive plate is in order to derive above-mentioned static.

12. electronic installation as claimed in claim 11, wherein, above-mentioned conductive plate also couples one with reference to ground connection, and static is emitted with reference to ground connection via above-mentioned.

13. electronic installation as claimed in claim 12, wherein, above-mentioned is a chassics earth with reference to ground connection.

14. electronic installation as claimed in claim 11, wherein, above-mentioned spacing is less than 1mm.

15. electronic installation as claimed in claim 11, wherein, the creepage distance of above-mentioned insulating case is at least two times of above-mentioned spacing.

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