CN112287630A - Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit - Google Patents
Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit Download PDFInfo
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- CN112287630A CN112287630A CN201910616328.9A CN201910616328A CN112287630A CN 112287630 A CN112287630 A CN 112287630A CN 201910616328 A CN201910616328 A CN 201910616328A CN 112287630 A CN112287630 A CN 112287630A
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- resistance
- resistance value
- keyboard
- resistor
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000005259 measurement Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 7
- 238000004020 luminiscence type Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Input From Keyboards Or The Like (AREA)
Abstract
The invention discloses a method for improving the resistance value of a loop in a keyboard and optimizing the layout of a printed circuit, wherein the loop of each keyboard lamp is connected in parallel in the circuit, and the method comprises the step of connecting a resistor in series on the loop of each keyboard lamp, so that the total resistance value on each loop tends to be the same, and the maximum deviation value is controlled within 2 omega. Connecting corresponding resistors in series according to the resistance value in the loop to meet the design requirement of the resistance value in the whole loop, ensuring that the resistors in the loop meet the design requirement and the current is stable, and achieving the consistency of LED luminescence; the resistor is simple in series connection, strong in practicability and reliable.
Description
Technical Field
The invention relates to the field of backlight keyboards, in particular to a method for improving the light-emitting effect of a backlight keyboard during use by improving the consistency of loop resistance values.
Background
The backlight keyboard is mainly characterized in that keys or a panel of the keyboard emits light, and key letters can be clearly seen under the condition that the light is not turned on at night. The integrated circuit board on the present backlight keyboard is made of printed circuit. For example, in the chinese patent with the publication number CN203771186U, the keyboard lamps (LED lamps) are connected in parallel, so that the brightness of each key is substantially equivalent, and each loop needs to be bent and detoured to obtain a better loop resistance value when the printed circuit layout is performed, which results in a complex printed circuit and is prone to different brightness of the lamps during the use.
Disclosure of Invention
To overcome the above-mentioned drawbacks, the present invention provides a method for improving the resistance of the loop in the keyboard and optimizing the layout of the printed circuit.
In order to achieve the above purposes, the invention adopts the technical scheme that: a method for improving the resistance of the loop in keyboard and optimizing the layout of printed circuit includes connecting the loop of each keyboard lamp in parallel to the circuit, connecting a resistor in series to the loop of each keyboard lamp to make the total resistance of each loop be the same and control the maximum deviation value to be within 2 omega.
The specific method comprises the following steps:
step 1, when a circuit is printed on a PCB or an FPC, firstly, two power lines are printed, and the two power lines detour and sequentially pass through keys on each keyboard;
step 3, presetting a target resistance value according to the overall layout condition of the circuit, wherein the target resistance value is larger than the first loop resistance value, and calculating the difference value A between the target resistance value and the first loop resistance value;
and 4, selecting a resistor closest to A, wherein the difference value between the resistance value of the resistor and A is less than 1 omega, and connecting the resistor to a corresponding loop in series so as to enable the resistance value on each loop to be approximately the same.
Further, the estimation of the resistance of each loop in step 2 should be in a non-energized state, and the actual resistance of the loop can be obtained by measurement.
Compared with the prior art, the invention meets the design requirement of the resistance value in the whole loop according to the resistance value in the loop which is connected with the corresponding resistor in series, ensures that the resistor in the loop meets the design requirement and the current is stable, and achieves the consistency of LED luminescence (which cannot be distinguished by naked eyes); the resistor is simple in series connection, strong in practicability and reliable.
Drawings
Fig. 1 is a schematic diagram of a keyboard lamp connection circuit according to an embodiment of the invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Examples
In the method for improving the resistance of the loops in the keyboard and optimizing the layout of the printed circuit in the embodiment, the loops of each keyboard lamp are connected in parallel in the circuit, and the method comprises the step of connecting a resistor in series on the loop of each keyboard lamp, so that the total resistance on each loop tends to be the same, and the maximum deviation value is controlled within 2 omega.
The method comprises the following specific operation steps:
step 1, when a circuit is printed on a PCB or an FPC, firstly, two power lines are printed in series, and the two power lines detour and sequentially pass through keys on each keyboard;
step 3, presetting a target resistance value according to the overall layout condition of the circuit, wherein the target resistance value is larger than the first loop resistance value, and calculating the difference value A between the target resistance value and the first loop resistance value;
and 4, selecting a resistor closest to A, wherein the difference value between the resistance value of the resistor and A is less than 1 omega, and connecting the resistor to a corresponding loop in series so as to enable the resistance value on each loop to be approximately the same.
In step 2, the resistance of each loop is estimated to be in a non-energized state, and the actual resistance of the loop can be obtained by measurement, and the actual resistance test of the loop can refer to the chinese patent with patent number CN99104822.9, entitled method for determining a loop width compensation value by measuring the loop resistance.
Referring to fig. 1, a circuit is printed on a PCB or FPC board (100), three circuits S1, S2, and S2 are connected in parallel in fig. 1, a keyboard light 1A and a resistor 1B are connected in series to the circuit S1, a keyboard light 2A and a resistor 2B are connected in series to the circuit S2, and a keyboard light 3A and a resistor 3B are connected in series to the circuit S3.
The resistance values of all the loops in the keyboard are inconsistent, and the resistance values in the same loop can be calculated and predicted; after the resistance value in each loop is confirmed before design, a proper resistor or an adjustable resistor is added to meet the design requirement of the resistance value of the loop, and resistors with different resistance values are added according to the difference of the resistance values of each loop to meet the design requirement so as to control the current stability of each loop; the stable and uniform light emitting effect is realized, and the problem of inconsistent brightness of the lamp caused by different impression currents of resistance is solved.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the present invention is not limited thereto, and any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. A method for improving the resistance of the loop in the keyboard and optimizing the layout of the printed circuit includes connecting a resistor in series with the loop of each keyboard lamp to make the total resistance of each loop be the same and control the maximum deviation value to be within 2 omega.
2. The method of claim 1, further comprising the steps of:
step 1, when a circuit is printed on a PCB or an FPC, firstly, two power lines are printed in series, and the two power lines detour and sequentially pass through keys on each keyboard;
step 2, connecting a loop in parallel at each key, respectively connecting two ends of the loop with two power lines, estimating the resistance of the loop, adding a keyboard lamp on the loop, and adding the resistance of the keyboard lamp and the resistance of the loop to form a first loop resistance;
step 3, presetting a target resistance value according to the overall layout condition of the circuit, wherein the target resistance value is larger than the first loop resistance value, and calculating a difference value A between the target resistance value and the first loop resistance value;
and 4, selecting a resistor closest to A, wherein the difference value between the resistance value of the resistor and A is less than 1 omega, and connecting the resistor to a corresponding loop in series so as to enable the resistance value on each loop to be approximately the same.
3. The method as claimed in claim 1, wherein the resistance of each circuit in step 2 is estimated to be in a non-powered state, and the actual resistance of each circuit is obtained by measurement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910616328.9A CN112287630A (en) | 2019-07-09 | 2019-07-09 | Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910616328.9A CN112287630A (en) | 2019-07-09 | 2019-07-09 | Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112287630A true CN112287630A (en) | 2021-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910616328.9A Pending CN112287630A (en) | 2019-07-09 | 2019-07-09 | Method for improving resistance value of inner loop of keyboard and optimizing layout of printed circuit |
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| CN (1) | CN112287630A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778510A (en) * | 2010-01-18 | 2010-07-14 | 海洋王照明科技股份有限公司 | LED signal indicator light and multipath LED drive circuits thereof |
| CN101979915A (en) * | 2010-08-05 | 2011-02-23 | 上海闻泰电子科技有限公司 | Method for improving bright uniformity of LED lamps |
| CN201903837U (en) * | 2010-08-10 | 2011-07-20 | 精元电脑股份有限公司 | Series-parallel circuit of luminescent keyboard |
| CN102933002A (en) * | 2012-11-19 | 2013-02-13 | 北京小米科技有限责任公司 | Driving circuit, system and method with mobile terminal keyboard lamps |
| CN202931640U (en) * | 2012-11-19 | 2013-05-08 | 北京小米科技有限责任公司 | Drive circuit and drive system for keyboard lamp of mobile terminal |
| CN205670514U (en) * | 2016-06-15 | 2016-11-02 | 嘉兴淳祥电子科技有限公司 | A kind of New LED illuminated keyboard circuit board |
| CN107277982A (en) * | 2017-08-03 | 2017-10-20 | 苏州瑞光电子科技股份有限公司 | LED light emission drive circuits |
| US20170322453A1 (en) * | 2015-12-22 | 2017-11-09 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight module, liquid crystal display device and backlight adjustment method thereof |
-
2019
- 2019-07-09 CN CN201910616328.9A patent/CN112287630A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101778510A (en) * | 2010-01-18 | 2010-07-14 | 海洋王照明科技股份有限公司 | LED signal indicator light and multipath LED drive circuits thereof |
| CN101979915A (en) * | 2010-08-05 | 2011-02-23 | 上海闻泰电子科技有限公司 | Method for improving bright uniformity of LED lamps |
| CN201903837U (en) * | 2010-08-10 | 2011-07-20 | 精元电脑股份有限公司 | Series-parallel circuit of luminescent keyboard |
| CN102933002A (en) * | 2012-11-19 | 2013-02-13 | 北京小米科技有限责任公司 | Driving circuit, system and method with mobile terminal keyboard lamps |
| CN202931640U (en) * | 2012-11-19 | 2013-05-08 | 北京小米科技有限责任公司 | Drive circuit and drive system for keyboard lamp of mobile terminal |
| US20170322453A1 (en) * | 2015-12-22 | 2017-11-09 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight module, liquid crystal display device and backlight adjustment method thereof |
| CN205670514U (en) * | 2016-06-15 | 2016-11-02 | 嘉兴淳祥电子科技有限公司 | A kind of New LED illuminated keyboard circuit board |
| CN107277982A (en) * | 2017-08-03 | 2017-10-20 | 苏州瑞光电子科技股份有限公司 | LED light emission drive circuits |
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