US5546457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Terminal apparatus
Assignee: Fujitsu Ltd
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Filing: 1995-05-16
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Granted: 1996-08-13
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Expires: 2015-05-16
Abstract
Abstract A telephone having a plurality of key tops and a small number of light sources for illuminating the key tops with a thin construction. A switch panel formed of a transparent material is mounted on a case of the telephone. The switch panel has a plurality of holes through which the key tops of a key top sheet are respectively inserted. An opaque film is formed on an outer surface of the switch panel. A plurality of conductive contracts are formed on a lower surface of the key top sheet at positions corresponding to the respective key tops. A plurality of switch patterns are formed on a printed circuit board so as to respectively face the conductive contacts. With this construction, the switch panel functions as a light guiding board, thereby efficiently illuminating the plurality of key tops by means of the small number of light sources such as LEDs.
Inventors
- 👤 Masashi Tomura
- 👤 Hisamitsu Takagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:40
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/22; H04M1/23; H04M1/0202; H04M1/0206; H04M1/0208; H04M1/0214
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A terminal apparatus comprising: a case; a printed circuit board accommodated in said case and formed with a plurality of switch patterns; a switch panel fixed to said case, said switch panel having a plurality of holes at positions corresponding to said plurality of switch patterns, said switch panel comprising: a light conducting transparent portion having an outer surface; and an opaque film formed on the outer surface of said transparent portion so as to be integrated with said transparent portion; a key top sheet having a plurality of key tops operable by a human user, said key top sheet being mounted on said printed circuit board with said key tops respectively inserted through said holes of said switch panel so that said switch panel and said key tops form outer surface portions of the terminal apparatus when said key tops are being operated by the human user; a plurality of conductive contacts provided on a lower surface of said key top sheet at positions corresponding to said key tops so as to respectively face said switch patterns with a predetermined distance defined; and a plurality of light sources in visual communication with said switch panel for introducing light into said switch panel to thereby conduct the light to a region of the switch panel through which said key tops are inserted.
Claim 2
Dependent Claim
222 words
A terminal apparatus comprising: a case; a printed circuit board accommodated in said case and formed with a plurality of switch patterns; a switch panel fixed to said case, said switch panel having a plurality of holes at positions corresponding to said plurality of switch patterns, said switch panel comprising: a light conducting transparent portion having an outer surface; and an opaque film formed on the outer surface of said transparent portion so as to be integrated with said transparent portion; a key top sheet having a plurality of key tops operable by a human user, said key top sheet being mounted on said printed circuit board with said key tops respectively inserted through said holes of said switch panel so that said switch panel and said key tops form outer surface portions of the terminal apparatus when said key tops are being operated by the human user; a plurality of conductive contacts provided on a lower surface of said key top sheet at positions corresponding to said key tops so as to respectively face said switch patterns with a predetermined distance defined; and a plurality of light sources in visual communication with said switch panel for introducing light into said switch panel to thereby conduct the light to a region of the switch panel through which said key tops are inserted.
Claim 3
Dependent Claim
41 words
The terminal apparatus according to claim 1, wherein each of said key tops is formed of a translucent material, and said key top sheet comprises an opaque sheet member and said translucent key tops integrally fixed to said opaque sheet member.
Claim 4
Dependent Claim
51 words
The terminal apparatus according to claim 2, wherein said opaque sheet member of said key top sheet comprises a supporting portion contacting said printed circuit board, a key top mounting portion spaced from said printed circuit board, and a skirt portion connecting said supporting portion with said key top mounting portion.
Claim 5
Dependent Claim
21 words
The terminal apparatus according to claim 1, wherein said plurality of light sources are LEDs provided in said key top sheet.
Claim 6
Dependent Claim
27 words
The terminal apparatus according to claim 1 further comprising a shielding member accommodated in said case, wherein said printed circuit board is mounted on said shielding member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |