CN1277449C - Electrostatic discharge protection on circuit board - Google Patents
Electrostatic discharge protection on circuit board Download PDFInfo
- Publication number
- CN1277449C CN1277449C CN 03130667 CN03130667A CN1277449C CN 1277449 C CN1277449 C CN 1277449C CN 03130667 CN03130667 CN 03130667 CN 03130667 A CN03130667 A CN 03130667A CN 1277449 C CN1277449 C CN 1277449C
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- CN
- China
- Prior art keywords
- circuit board
- electrostatic discharge
- esd
- sub
- main circuit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Elimination Of Static Electricity (AREA)
Abstract
The present invention relates to an electrostatic discharge protective device on a circuit board. The present invention utilizes two separated circuit boards. When electrostatic discharge current is generated on the first circuit board, the electrostatic discharge current can not impact chips of the second circuit board, and the chips on the second circuit board can be protected from the impact of the electrostatic discharge current.
Description
Technical field
The present invention is relevant for the electrostatic discharge (ESD) protection on the circuit board, and particularly relevant for the current protection path that prevents that in the separate type circuit board other circuit board static discharges from impacting.
Background technology
In general, electrostatic charge can be accumulated in the surface of human body, and the amount of this electrostatic charge can arrive several kilovolts greatly.If touch metal with hand, the circuit board of especially general IC chip or embedding IC chip, electrostatic charge on one's body can discharge in a flash on IC chip or the circuit board, this promptly be called static discharge (Electro Static Discharge, ESD).And static discharge current probably can cause the misoperation or the damage of IC chip.
Please refer to Fig. 1, it represents the circuit board wiring schematic diagram of known thin compact disc device.The circuit board of thin compact disc device can be divided into two parts, and sub-circuit board (Sub-Board) 200 is fixed on the removable pallet (Tray), and 100 of main circuit boards (Main Board) are fixed on the casing.The flexible winding displacement of U type (Flexible Cable) 300 that is connected between two circuit boards can be used as all control signals of transmitting between main circuit board 100 and the sub-circuit board 200.Therefore, sub-circuit board 200 can be put into (TrayIn) and still keeps being connected with all control signals of main circuit board 100 with the action of taking out (Tray Out) along with removable pallet.
In general, Spindle Motor 202, Spindle Motor chip for driving 204, optical head (not shown) and optical head control chip 206 are arranged on the sub-circuit board 200.And analogue signal processor (Analog Signal Microprocessor) 102, Digital Signal Processing/decoding processor (DSP/DecoderMicroprocessor) 104, flash memory dies (Flash ROM) 106, static RAM (SDRAM) chip 108 are arranged on the main circuit board 100.Above-mentioned device all utilizes the flexible winding displacement 300 of U type to be connected with the control signal on the chip, is omitted among the figure.And except control signal, the ground path 120,220 of two circuit boards 100,200 also must utilize a connecting line 320 in the flexible winding displacement 300 of U type to connect.And main circuit board 100 because and utilize screw 110 to fix between the casing, moreover ground path 120 can be connected with screw 110, makes casing have earthing potential.
Because removable pallet when putting into and take out CD, can contact with the user.Therefore, static discharge current can be flowed to the ground path 220 of sub-circuit board 200 by the user.Known this static discharge current is delivered to ground path 120 on the main circuit board 100 via a connecting line 320 in the flexible winding displacement 300 of U type again, and conduction causes screw 110 backs and derives optical disc apparatus by casing again.Yet before static discharge current flow to screw 110, static discharge current may impact on the main circuit board 100 processor or chip, caused the damage of processor or chip or the main circuit board 100 can not regular event.
Summary of the invention
Purpose of the present invention proposes the electrostatic discharge (ESD) protection on a kind of circuit board.Make the static discharge current that is produced on the sub-circuit board can the not flow through processor and the chip of main circuit board, the impact that can not be subjected to static discharge current in order to processor on the protection main circuit board and chip.
The present invention proposes the electrostatic discharge (ESD) protection on a kind of circuit board, in order to receive the static discharge current that is produced and be transmitted to first ground path on the sub-circuit board by sub-circuit board; Have a connecting line in the flexible winding displacement at least, one end end is connected to first ground path; And, have an electrostatic discharge (ESD) protection path to be directly connected between the other end and a retaining element of connecting line on the main circuit board, and second ground path on the main circuit board is directly connected to retaining element.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
It represents the circuit board wiring schematic diagram of known thin compact disc device Fig. 1; And
The circuit board wiring schematic diagram of the 2nd its expression thin compact disc device of the present invention.
The figure number explanation
100 main circuit boards, 102 analogue signal processors
104 Digital Signal Processing/decoding processor 106 flash memory dies
108 static random access memory chips, 110 screws
120 ground paths, 122 electrostatic discharge (ESD) protection paths
200 sub-circuit boards, 202 Spindle Motors
204 Spindle Motor chip for driving, 206 optical head control chips
The flexible winding displacement of 220 ground paths, 300 U types
320 connecting lines
Embodiment
Please refer to Fig. 2, the circuit board wiring schematic diagram of its expression thin compact disc device of the present invention.The circuit board of thin compact disc device can be divided into two parts, and sub-circuit board (Sub-Board) 200 is fixed on the removable pallet (Tray), and 100 of main circuit boards (Main Board) are fixed on the casing.
The present invention first design one electrostatic discharge (ESD) protection path 122 on the configuration of main circuit board 100, the one end is connected to a connecting line 320 in the flexible winding displacement 300 of U type, and this connecting line 320 is connected with ground path 220 on the sub-circuit board 200.The other end then is directly connected to screw 110.And according to embodiments of the invention, this electrostatic discharge (ESD) protection path 122 has the live width of broad, and it is 0.75mm, but above-mentioned limit for width only is with reference to usefulness, in fact, as long as live width is greater than minimum feature 0.15mm.Moreover ground path 120 layouts that are connected to chip and processor on the main circuit board 100 are directly connected to screw 110.
Since known static discharge current can be delivered on the main circuit board 100 by the ground path 220 of sub-circuit board 200 and impact processors all on the main circuit board and chip after by screw 110 static discharge current is transmitted to casing.
Therefore, the damage that static discharge current causes processor and chip can be avoided in the designed electrostatic discharge (ESD) protection path 122 of the present invention.When static discharge current was delivered on the main circuit board 100 by the ground path 220 of sub-circuit board 200, electrostatic discharge (ESD) protection path 122 directly was transmitted to static discharge current screw 110 and is discharged into outside the optical disc apparatus by casing.Therefore, can significantly reduce the impact of static discharge current, and then make that main circuit board can normal operation processor and chip.
Therefore, advantage of the present invention makes the static discharge current that is produced on the sub-circuit board can the not flow through processor and the chip of main circuit board, the impact that can not be subjected to static discharge current in order to processor on the protection main circuit board and chip.
In sum; though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from design of the present invention and scope; can carry out various changes and modification, so protection scope of the present invention is as the criterion with the claim institute restricted portion that is proposed.
Claims (5)
1. the electrostatic discharge (ESD) protection system on the circuit board in order to receive a static discharge current that is produced and be transmitted to one first ground path (220) on this sub-circuit board by a sub-circuit board (200), comprising:
One flexible winding displacement (300) has at least an end of a connecting line (320) to be connected to this first ground path in this flexible winding displacement; And
One main circuit board (100); have an electrostatic discharge (ESD) protection path (122) to be directly connected between the other end and a retaining element (110) of this connecting line on this main circuit board, and one second ground path (120) on this main circuit board is directly connected to this retaining element.
2. the electrostatic discharge (ESD) protection system on the circuit board as claimed in claim 1, wherein this retaining element (110) is a screw.
3. the electrostatic discharge (ESD) protection system on the circuit board as claimed in claim 1, wherein this sub-circuit board (200) is fixed on the removable pallet of an optical disc apparatus, and this main circuit board (100) is fixed on the casing of this optical disc apparatus.
4. the electrostatic discharge (ESD) protection system on the circuit board as claimed in claim 3, wherein this optical disc apparatus is a thin compact disc device.
5. the electrostatic discharge (ESD) protection system on the circuit board as claimed in claim 1, wherein this flexible winding displacement (300) is the flexible winding displacement of a U type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130667 CN1277449C (en) | 2003-05-07 | 2003-05-07 | Electrostatic discharge protection on circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03130667 CN1277449C (en) | 2003-05-07 | 2003-05-07 | Electrostatic discharge protection on circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1549663A CN1549663A (en) | 2004-11-24 |
| CN1277449C true CN1277449C (en) | 2006-09-27 |
Family
ID=34322646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03130667 Expired - Fee Related CN1277449C (en) | 2003-05-07 | 2003-05-07 | Electrostatic discharge protection on circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1277449C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100397957C (en) * | 2005-04-26 | 2008-06-25 | 佛山市顺德区顺达电脑厂有限公司 | Method for eliminating statics on main board |
-
2003
- 2003-05-07 CN CN 03130667 patent/CN1277449C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1549663A (en) | 2004-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060927 Termination date: 20140507 |