US4737631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter of photoelectric touch panel with integral spherical protrusion lens
Assignee: Alps Alpine Co Ltd
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Filing: 1986-05-19
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Granted: 1988-04-12
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Expires: 2006-05-19
Abstract
Abstract A filter of a photoelectric touch panel which is disposed on the front of an array mounted with light emitting elements and/or light receiving elements and disposed around a faceplate in the form of a frame, and characterized in that converging sections are formed on the filter at least at positions corresponding to the individual elements, thereby eliminating preparation of converging lenses.
Inventors
- 👤 Hiroaki Sasaki
- 👤 Kazuo Hasegawa
- 👤 Junichi Ouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:22
CPC Classifications
G; G06; G06F; G06F3/00; H; H03; H03K; H03K17/00; H03K17/94; H03K17/941; H03K17/943
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
179 words
In a photoelectric touch panel having arrays of light emitting elements and light receiving elements disposed around the sides of a display screen for forming a matrix of light beams in front of the display screen for detecting the presence of a pointing object interposed in the matrix, and a filter disposed in front of the light receiving and emitting elements around the sides of the display screen for preventing light external to the panel from affecting the light receiving elements and light from the light emitting elements from being projected outside the panel, the improvement comprising said filter being formed as a single rectangular frame body of which the sides have on their surfaces facing into the matrix a plurality of spherical protrusions integrally formed thereon at positions corresponding to respective ones of the light emitting and receiving elements, said spherical protrusions serving the function of focusing light beams emitted or received by the light elements forming the matrix in combination with the function of said filter preventing light from being received or projected externally of said panel.
Claim 2
Dependent Claim
179 words
In a photoelectric touch panel having arrays of light emitting elements and light receiving elements disposed around the sides of a display screen for forming a matrix of light beams in front of the display screen for detecting the presence of a pointing object interposed in the matrix, and a filter disposed in front of the light receiving and emitting elements around the sides of the display screen for preventing light external to the panel from affecting the light receiving elements and light from the light emitting elements from being projected outside the panel, the improvement comprising said filter being formed as a single rectangular frame body of which the sides have on their surfaces facing into the matrix a plurality of spherical protrusions integrally formed thereon at positions corresponding to respective ones of the light emitting and receiving elements, said spherical protrusions serving the function of focusing light beams emitted or received by the light elements forming the matrix in combination with the function of said filter preventing light from being received or projected externally of said panel.
Claim 3
Dependent Claim
18 words
A filter of a photoelectric touch panel according to claim 1, wherein said elements are LEDs and/or phototransistors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |