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WO1998039785B1 - Electrostatic discharge protection in a portable communication device - Google Patents

Electrostatic discharge protection in a portable communication device

Info

Publication number
WO1998039785B1
WO1998039785B1 PCT/SE1998/000208 SE9800208W WO9839785B1 WO 1998039785 B1 WO1998039785 B1 WO 1998039785B1 SE 9800208 W SE9800208 W SE 9800208W WO 9839785 B1 WO9839785 B1 WO 9839785B1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
communication device
domefoil
keypad
esd
Prior art date
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.)
Ceased
Application number
PCT/SE1998/000208
Other languages
French (fr)
Other versions
WO1998039785A1 (en
Filing date
Publication date
Priority claimed from SE9700736A external-priority patent/SE513069C2/en
Priority to EP98908352A priority Critical patent/EP0965139B1/en
Application filed filed Critical
Priority to KR1019997007924A priority patent/KR100540352B1/en
Priority to JP53842298A priority patent/JP3883014B2/en
Priority to CA002282446A priority patent/CA2282446A1/en
Priority to EEP199900380A priority patent/EE04407B1/en
Priority to HK00106242.3A priority patent/HK1027212B/en
Priority to BR9807813-5A priority patent/BR9807813A/en
Priority to DE69832778T priority patent/DE69832778D1/en
Priority to AU66402/98A priority patent/AU732251B2/en
Publication of WO1998039785A1 publication Critical patent/WO1998039785A1/en
Publication of WO1998039785B1 publication Critical patent/WO1998039785B1/en
Priority to NO19994167A priority patent/NO317121B1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Abstract

A portable communication device (10) has an electronic circuit board (20) arranged inside a housing (12), and a keypad (30), the individual keys (32) of which are arranged, when depressed, to collapse a respective tactile dome (52) on a domefoil (50) interposed between the keypad and the circuit board, so as to establish electric contact with a respective contact point (22) on the circuit board. The communication device has means for protecting the circuit board from electrostatic discharge (ESD). The domefoil (50) is formed as a non-conductive sheet providing an air-tight and/or electrostatic seal between the keypad (30) and the circuit board (20), whereby the domefoil functions as said ESD-protective means.

Claims

AMENDED CLAIMS[received by the International Bureau on 18 August 1998 (18.08.98); original claims 1-10 replaced by amended claims 1-8 (2 pages)]
1. A portable communication device (10), comprising an electronic circuit board (20) arranged inside a housing (12) , and a keypad (30) , the individual keys (32) of which are arranged, when depressed, to collapse a respective tactile dome (52) on a domefoil (50) interposed between the keypad and the circuit board, so as to establish electric contact with a respective contact point (22) on the circuit board, said communication device being provided with means for protecting the circuit board from electrostatic discharge (ESD) , c h a r a c t e r i z e d in that said domefoil (50) is formed as a non-conductive sheet providing an air-tight and/or electrostatic seal between the keypad (30) and the circuit board (20) , said domefoil thereby functioning as said ESD-protective means, and in that an electrically conductive layer is embedded in the domefoil (50) and is connected to ground means, said layer thereby preventing electromagnetic interference between the device and its surroundings .
2. A communication device according to claim 1, wherein said circuit board is provided with means (24) for illuminating the keys (32) in the keypad (30) and said domefoil (50) is provided with additional domes (54) covering the illuminating means (24), thereby protecting the circuit board (20) from ESD.
3. A communication device according to claim 2, wherein said additional domes (54) are made transparent to the light emitted from the illuminating means (24) .
4. A communication device according to claim 2, wherein said additional domes (54) are made white or 12
glossy, so as to enhance the illumination of the keys (32) in the keypad (30) .
5. A communication device according to claim 2, wherein said additional domes (54) are printed with a screen or dot pattern.
6. A communication device according to any preceding claim, wherein the domefoil (50) is provided with air chan- nels for dissipating heat generated by the circuit board (20) or components thereon.
7. A communication device according to any preceding claim, wherein the device is a radio telephone, preferably a cellular telephone.
8. A method of protecting a keypad-operated device (10) from electrostatic discharge between a keypad (30) and an electronic circuit board (20) inside the device, c h a r a c t e r i z e d by providing the device (10) with a domefoil (50), comprising a set of tactile domes (52) and at least the entire front surface of which being made from an electrically isolating material, as an air-tight and/or electro- static seal between the keypad (30) and the circuit board (20) , and by providing the interior of the domefoil (50) with an electrically conductive and grounded layer, said layer acting as an electromagnetic shield between the circuit board (20) and electronic equipment external to the device (10) .
PCT/SE1998/000208 1997-03-03 1998-02-06 Electrostatic discharge protection in a portable communication device Ceased WO1998039785A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
BR9807813-5A BR9807813A (en) 1997-03-03 1998-02-06 Portable communication device and process to protect a keyboard operated device against electrostatic discharge.
HK00106242.3A HK1027212B (en) 1997-03-03 1998-02-06 A portable communication device
KR1019997007924A KR100540352B1 (en) 1997-03-03 1998-02-06 Electrostatic Discharge Protection in Portable Communication Devices
JP53842298A JP3883014B2 (en) 1997-03-03 1998-02-06 Electrostatic discharge protection in portable communication devices
CA002282446A CA2282446A1 (en) 1997-03-03 1998-02-06 Electrostatic discharge protection in a portable communication device
EEP199900380A EE04407B1 (en) 1997-03-03 1998-02-06 Portable communications device and method for protecting a keypad controlled communications device against electrostatic charges
DE69832778T DE69832778D1 (en) 1997-03-03 1998-02-06 PROTECTION AGAINST ELECTROSTATIC DISCHARGES IN A PORTABLE COMMUNICATION DEVICE
EP98908352A EP0965139B1 (en) 1997-03-03 1998-02-06 Electrostatic discharge protection in a portable communication device
AU66402/98A AU732251B2 (en) 1997-03-03 1998-02-06 Electrostatic discharge protection in a portable communication device
NO19994167A NO317121B1 (en) 1997-03-03 1999-08-27 ESD protection of portable communication device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9700736-3 1997-03-03
SE9700736A SE513069C2 (en) 1997-03-03 1997-03-03 Protection against electrostatic discharge in a portable communication device

Publications (2)

Publication Number Publication Date
WO1998039785A1 WO1998039785A1 (en) 1998-09-11
WO1998039785B1 true WO1998039785B1 (en) 1998-10-15

Family

ID=20405983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000208 Ceased WO1998039785A1 (en) 1997-03-03 1998-02-06 Electrostatic discharge protection in a portable communication device

Country Status (18)

Country Link
US (1) US6207912B1 (en)
EP (1) EP0965139B1 (en)
JP (1) JP3883014B2 (en)
KR (1) KR100540352B1 (en)
CN (1) CN1169173C (en)
AR (1) AR011924A1 (en)
AU (1) AU732251B2 (en)
BR (1) BR9807813A (en)
CA (1) CA2282446A1 (en)
CO (1) CO4780083A1 (en)
DE (1) DE69832778D1 (en)
EE (1) EE04407B1 (en)
ID (1) ID27860A (en)
MY (1) MY123189A (en)
NO (1) NO317121B1 (en)
RU (1) RU2204871C2 (en)
SE (1) SE513069C2 (en)
WO (1) WO1998039785A1 (en)

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JP2007294320A (en) * 2006-04-26 2007-11-08 Sunarrow Ltd Method for manufacturing key top for push-button switch
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