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按键结构及基本概念


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KEY PAD DESIGN ? PHYSICAL PROPERTIES
Basic Properties of Rubber Key Pads Materials

ITEM
COLOR Specific Gravity (比重) Hardness (硬度) (JIS A)

UNIT

S-116
Milky White Translucent

S-102
Milky White Translucent

S-103
Grayish White

REMARK

g/cm

3

1.12

1.15

1.22

---

°
2

40

50

60

normally to use JIS type A.

Tensile Strength (抗張強度) Elongation (伸長率) Linear Shrinkage (縮收率) Compression Set (壓縮永久變型量) Tear Strength (撕裂強度) (A Type)

kg/cm

75

90

73

--拉 斷 時 的 長度減去原來 的長度除以原來的長度. 1000* (1-(38/1000))

%

450

340

280

%

4

3.8

3.4

%

11

12

13

---

kg/cm

11

14

15

與 離 模 時的壽命有關

Plasticity Number (Williams) (可塑度) Volume resistivity (體積阻抗) UL 94 (防火實驗規格)
* Test Method Conforms JISK -6301 And JIS-C-2123

230

260

305

針對生膠而言

(ohm-cm)

1*10

15

1*10

15

1*10

15

---

94HB

94HB

94HB

---

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Rubber Keypads Specifications (一)
Rubber Key Specification
Actuation force………...…………………………………...………………….……… 20 to 500 grams Contact resistance …………………………………………….…..….………...……Less than 200 ohms Cycle life………..……………………………………………...……….……….……500k to 30 million Operating temperature range……………………………………….………………....… - 20 C to 180 C Storage temperature rang….……………………………………..………….………..… - 30 C to 250 C Contact rating .………………………………………………...………....……5 milliamperes at 12VDC …………………………………………………………..……..……for 0.5seconds and 20 million cycles Contact bounce…………………………………………….……..……….……less than 12 milliseconds Insulation resistance………………………………………..….………….….. greater than 10 500VDC Breakdown voltage…………………….………… ……….……………...…25 to 30KV per millimeter
12 o o o o

ohms at

NOTE: All specifications noted above are for general reference. Special applications may require more detailed specifications which are available upon customer's request.

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Rubber Keypads Specifications (二)
Dimension Tolerance Key Pad 0 to 10 mm ± 0.10 m/m 10 to 20 mm ± 0.15 m/m 20 to 30 mm ± 0.20 m/m 30 to 40 mm ± 0.25 m/m 40 to 50 mm ± 0.30 m/m 50 mm or greater ± 0.6% Computer Key Pad 200 to 250 mm ± 0.6mm 250 to 300 mm ± 0.6mm 400 to 450 mm ± 0.8mm 450 to 500 mm ± 0.8mm

NOTE: All specifications noted above are for general reference. Specical applications may require more detailed specifications which are available upon customer's request.
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Rubber Keypads Specifications (三)
Actuation force tolerance Key Pad 50 grams ± 15 grams 75 grams ± 20 grams 100 grams ± 25 grams 125 grams ± 25 grams 150 grams ± 30 grams 175 grams ± 30 grams 200 grams or greater ± 20% Computer Key Pad 40 grams ± 8 grams 50 gram s ± 8 grams 60 grams ± 10 grams 80 grams ± 10 grams

NOTE: All specifications noted above are for general reference. Specical applications may require more detailed specifications which are available upon customer's request.
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Key Pad Design Terminology
1

Key top

2

Web
3

Key Base or Pad

7

PCB

5 6

Travel Knee Wall

4

Conduct Conductive Pill

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1 Keytop A non-conductive,silicone rubber pushbutton.w or w/o Printing,Plastic keycaps or P-Top can also be designed-in for "push-on" fit .keytops are available in dual hardness. 2 Web The flexible "moving" non-conductive rubber part.The web's shape affects the operating reliability and tactile response feeling of the switch 3 Key Base or Pad A single rubber sheet that ccontains one or more keytops/switches 4 Conductive Pill The current carrying conductive silicone portion of ther rubber switch which "bridges" a contact circuit on the PCB. Note: other contact materials available for special design. 5 Travel The distance required to depress the rubber keytop to complete electrical connection between conductive pills and the printed circuit board. 11 10 9 8 Volume Resistivity Electrical resistance within one centimetre square ot conductrve material. Expressed as Ohm-Centimeters. Hardness The hardness of rubber is measured in durometer.The higher of the durometer; the harder of the material and the higher force of key pad. Force Or Peak Force The minimum force value required to collapse the web of the keypad. Click Ratio The difference between peak force and the return force of a rubber key pad . Expressed as a% of peak force . This characteristic is caused by the sudden collapse of the web of key pad. The degree of snap is a function of force and travel. 7 6 Knee Wall The internal height between button and web end. PCB Printed circuit Board.

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Key Pad Design Terminology(一)
1

Key top

KEY TOP A non-conductive, silicone rubber pushbutton. w or w/o printing, Plastic keycaps or P-top can also be designed-in for "push-on" fit. keytops are available in dual hardness.
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Key Pad Design Terminology(二)

2

Web

WAB The flexible "moving" non-conductive rubber part. The web's shap affects the operating reliability and tactile response feeling of the switch
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Key Pad Design Terminology(三)

3

Key Base or pad

Key Base or Pad
A single rubber sheet that contains one or more keytops/switches

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Key Pad Design Terminology(四)

4

Conductive pill

Conductive Pill
The current carrying conductive silicone portion of ther rubber switch which "bridges" a contact circuit on the PCB. Note: Other contact materials available for special design.
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Key Pad Design Terminology(五)

5

Travel

Travel
The distance required to depress the rubber keytop to complete electrical connection between conductive pills and the printed circuit board.

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Key Pad Design Terminology(六)

6

Knee Wall

Knee Wall
The internal height between button and web end.

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Key Pad Design Terminology(七)

7

PCB

PCB
Printed circuit Board.

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KEY PAD DESIGN HUMAN FEELING CONSIDERATIONS
Force-Stroke Curve of Rubbei Keypad
FORCE (gram) Fp Fg Fd Fm M P A

Force

Stroke

Fc

C

Location
R

Fr

O
Sp Sc(Sr) Sa

STROKE (mm)

Travel

*Fp Fc Fa *Fr Fm Fd Fg Sp Sa Sc(Sr) O P C A R M O-P P-C C-A A-R-M-O

Peak Force (Fmax) Contact Force Actual Contact Force Min.Return Force(Fmin) Max.Return Force Drop Force (Fd=Fp-Fc) Gap Force(Fg=Fp-Fm) Peak Storke Actual Storke Contact Storke Original Point Peak Point Contact Point Actual (CONTACT)Point Return Point Max Return Point Preload Travel Travel To Contact Post Travel Return Travel

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Human Feeling Factor Considerations (一 ) (一

Structure

Force-Stroke Curve

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

F

20~350

0.5~3.0

0.5~2.0

Telephone,Remote Control.Automotive Radio,Toys, Calculator,…etc.

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Human Feeling Factor Considerations (二 ) (二

Structure

Force-Stroke Curve F

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

30~250

0.7~1.5

0.5~2.0

Telephone, Remote Control. Toys,Games, Calculator, …etc.

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Human Feeling Factor Considerations (三 ) (三

Structure

Force-Stroke Curve F

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

30~150

0.5~3.0

1.0~5.0

Telephone, Remote Control Toys,Measuring instruments, Office Machine …etc.

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Human Feeling Factor Considerations (四 ) (四

Structure

Force-Stroke Curve F

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

30~80

2.0~4.0

5.0~2.0

Computer Typewriter, …etc.

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Human Feeling Factor Considerations (五 ) (五

Structure

Force-Stroke Curve F

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

30~200

1.0~2.5

0.5~3.0

Telephone, Typewriter, Test Instruments …etc.

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Human Feeling Factor Considerations (六 ) (六

Structure

Force-Stroke Curve F

Force Range (grams)

Stroke Range (mm)

Cycle Life (kk)

Typical Uses

20~80

0.2~1.0

0.5~1.0

Remote Control Calculator, Typewriter, Computer …etc.

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Keypad Design Design Recommendations

P1

1

A

B b

a

A&B are dimensions of plastic a &b are dimensions of rubber (A-a) ≧0.8mm,(B-b) ≧ 0.6mm is better
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Keypad Design Design Recommendations

P2
r

2

R R:the corner radius of plastic r: the corner radius of rubber 1mm ≦ R ≦ 1.5mm,0.75mm ≦ r

≦ 1.25mm is better

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Keypad Design Design Recommendations

P3

3
H

S

H:the dimension between key top & plastic

S:the stroke of key pad
H-S ≧ 1.5mm is better

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Keypad Design Design Recommendations

P4

4

No flash in plastic is better

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Keypad Design Design Recommendations

P5
(b)

5

(a)

(a) is better design than (b)

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Keypad Design Design Recommendations

P6

6

T W Linear shrinkage control design T ≦0.3mm is better W=2~3mm is better
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Keypad Design Design Recommendations

P7

7
D

d

D-d

≧ 2~3mm is better

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Keypad Design Design Recommendations

P8

8

t p p : diameter of post t :the gap between post&conductive pill p ≧ 1.0mm is better t=0.1~0.15mm is better

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Keypad Design Design Recommendations

P9

9
FORCE

F1
Fc

F2

S1

S2

F C : click force F C =F1-F2≧25g is better

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Keypad Design Design Recommendations

P10

10

FORCE

FR

R F R :return force R F R≧ 30g is better
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F S

SR

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Rubber key Design Guide
? Assembly Methods- option 1

Key Top

Bezel

Rubber Key

PCB

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Rubber key Design Guide
? Assembly Methods- Option 2

Rubber Key

Bezel

PCB

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Rubber key Design Guide
? Artwork Print Option 1
Button Graphics

Graphics offcenter ± 0.3m/m

Wear resistance: All keys must pass 15 cycles minimum wear on RCA Abrader, 2018664 per IU4001 PORA 5.3.1e

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Rubber key Design Guide key Design Guide
? Artwork Print Option 2
Full Surface Printing

a a=0.5mm ±0.15mm

b=0.5mm ±0.15mm a b b

Wear resistance: All keys must pass 15 cycles minimum wear on RCA Abrader, 2018664 per IU4001 PORA 5.3.1e

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Dimensional Recommendations of Key Pad (1)

Tear Line 2 Notes: 1.Typical outside radius is 1.0 to 1.5mm. 2.Minimum radius is 0.5 mm. 3.Minimum inside radius is 0.5 mm. 4.Spacing between the key web and guide hole is 1.0 mm or more. 5.Guide holes are a min 1.0mm diameter. 6 Min.distance of guide hole to edge is 1.0mm. 6 4 3 5 1

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Dimensional Recommendations of Key Pad (2)
8

10

7. The with of a rubber dome base is typically 2.0mm more than a. 8. The min. radius for the side edges of key tops is 0.25mm 9. The min. radius for the top edges of key tops is 0.3 mm 10. Draft angle 1.0 ±0.5°

1.0 ±0.5°

a
7

9

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Keypad Design—Conductive Pill options
Conductive Pill Type

Items Cicle Square Ellipse Print Type

Standard Sizes Φ2, Φ2.5,Φ3,Φ3.5,Φ4,Φ4.5,Φ5,Φ6,Φ7,Φ8 13*13, 11*11, 7*7 2*3.5, 2*4.5, 2*7, 2*8, 3*7.5, 3*11, 4*6 Circle, Square, Ellipse,…etc.

Conductive Pill Resistance: Less than 200 ohms with 100 gr Plus Peak Force Loading Life: 20 million Print Type Resistance: Less than 1K ohms, with 100 gr Plus Peak Force Loading Life: 1*10 Note: The round pills are more economic than others pill shapes.
6

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PCB Circle Type

. Gold Traces (4 pattens)

. Carbon Traces (3 pattens)

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Key Pad Design Illuminated Options-1
Side LED Mounting
? With light shield
Key top

PCB LED

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Key Pad Design Illuminated Options-2
Full LED Illumination

Key Top

PCB

LED

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Key Pad Design Illuminated Options-3
Light pipe ? Insert moulding of a plastic or silicone light pipe directly into the key top

Light pipe

Key Top

PCB

LED

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Special Design for Construction Ideas-1

? Different shorehardness in the basic keypade and keys

Different hardness and clours available

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Special Design for Construction Ideas-2

? Packingbulb hollow for less connection pressure

PCB

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Special Design for Construction Ideas-3

? Construction idea distance holder Led

PCB

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Special Design for Construction Ideas-4

? Square key top design with Led window.

Space of Led

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Special Design for Construction Ideas-5

? Led on Same P.C.B

Translucent Rubber Led

PCB

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Special Design for Construction Ideas-6

? Control the full travel

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