US5557079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic device with shielded keypad interface
Assignee: Motorola Solutions Inc
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Filing: 1995-07-03
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Granted: 1996-09-17
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Expires: 2015-07-03
Abstract
Abstract An electronic device (100) has a housing (110), and a shielded keypad interface (150) for actuating a switch (285, 290) accessible through an opening (115) within the housing (110). The keypad interface (150) has a key surface (265) that is aligned with the opening (115) and with the switch (285, 290). A conductive layer (250) between the key surface (265) and the switch (285, 290) covers the opening (115). The conductive layer (250) is electrically isolated from the switch (285, 290), and coupled to electrical ground (255) to provide an electrical shield for the keypad interface (150).
Inventors
- 👤 Greg D. Jackson
- 👤 Tyler D. Jensen
- 👤 Julio C. Castaneda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:18
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/702; H01H2231/00; H01H2231/022; H01H2239/00; H01H2239/004
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
118 words
An electronic device having a shielded keypad interface, comprising: a housing having a keypad interface portion with an opening therein that forms a key hole; a substrate mounted within the housing, the substrate having circuitry including switch contacts mounted thereon; a keypad mechanically coupled to the housing, comprising: an actuator mounted within the key hole, the actuator having an externally accessible key surface; and a resilient insulative material having first and second opposing surfaces, the first surface being metallized with conductive material, the second surface having a movable contact disposed thereon, the movable contact being aligned with the actuator the conductive material being coupled to electrical ground; wherein the conductive material provides an electrical shield for the circuitry.
Claim 2
Dependent Claim
118 words
An electronic device having a shielded keypad interface, comprising: a housing having a keypad interface portion with an opening therein that forms a key hole; a substrate mounted within the housing, the substrate having circuitry including switch contacts mounted thereon; a keypad mechanically coupled to the housing, comprising: an actuator mounted within the key hole, the actuator having an externally accessible key surface; and a resilient insulative material having first and second opposing surfaces, the first surface being metallized with conductive material, the second surface having a movable contact disposed thereon, the movable contact being aligned with the actuator the conductive material being coupled to electrical ground; wherein the conductive material provides an electrical shield for the circuitry.
Claim 3
Dependent Claim
15 words
The electronic device of claim 1, wherein the resilient insulative material is impermeable to oil.
Claim 4
Dependent Claim
14 words
The electronic device of claim 1, wherein the movable contact comprises a conductive pad.
Claim 5
Dependent Claim
35 words
The electronic device of claim 1, wherein the resilient insulative material comprises first and second layers of Mylar adhesively bonded together, the first layer being metallized, and the cavity being formed within the second layer.
Claim 6
Dependent Claim
26 words
The electronic device of claim 1, wherein the housing has metallization disposed thereon, and the conductive material is electrically coupled to the metallization of the housing.
Claim 7
Dependent Claim
144 words
An electronic device having a shielded keypad interface, comprising: a housing having a keypad interface and having a button hole extending through the keypad interface; a substrate having circuitry mounted within the housing, the circuitry including a pair of switch contacts; a keypad disposed adjacent to the pair of switch contacts, the keypad comprising: a resilient insulative material having first and second opposing surfaces, the first surface being metallized with an electrically conductive material, the second surface having a cavity; a contact pad disposed within the cavity of the resilient insulative material; an actuator button disposed within the housing and having a portion extending through the button hole, the actuator button being in register with the conductive pad; wherein the conductive material is electrically grounded and provides an electrical shield that protects the circuitry from electromagnetic interference through the opening in the keypad interface.
Claim 8
Dependent Claim
144 words
An electronic device having a shielded keypad interface, comprising: a housing having a keypad interface and having a button hole extending through the keypad interface; a substrate having circuitry mounted within the housing, the circuitry including a pair of switch contacts; a keypad disposed adjacent to the pair of switch contacts, the keypad comprising: a resilient insulative material having first and second opposing surfaces, the first surface being metallized with an electrically conductive material, the second surface having a cavity; a contact pad disposed within the cavity of the resilient insulative material; an actuator button disposed within the housing and having a portion extending through the button hole, the actuator button being in register with the conductive pad; wherein the conductive material is electrically grounded and provides an electrical shield that protects the circuitry from electromagnetic interference through the opening in the keypad interface.
Claim 9
Dependent Claim
14 words
The electronic device of claim 6, wherein the resilient material is impermeable to oil.
Claim 10
Dependent Claim
35 words
The electronic device of claim 7, wherein the resilient insulative material comprises first and second layers of Mylar adhesively bonded together, the first layer being metallized, and the cavity being formed within the second layer.
Claim 11
Dependent Claim
26 words
The electronic device of claim 6, wherein the housing has metallization disposed thereon, and the conductive material is electrically coupled to the metallization of the housing.
References Cited (Backward Citations)
US3890480A
Cited
US4336529A
Cited
US4680724A
Cited
US4456800A
Cited
US5031027A
Cited
US5241695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-09-17 | 2000-03-18 | 2000-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-09-17 | 2004-03-18 | 2004-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-09-17 | 2008-03-18 | 2008-09-17 | $7700.00 | Window Closed / Lapsed |