[특허]Modulated touch entry system and method with synchronous detection

Modulated touch entry system and method with synchronous detection 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G09G-003/02
출원번호	US-0569242 (1990-08-16)
발명자 / 주소	Wehrer Wayne J. (Austin TX)
출원인 / 주소	AMP Incorporated (Harrisburg PA 02)
인용정보	피인용 횟수 : 41 인용 특허 : 0

초록 ▼

A modulated touch entry system and corresponding method for detecting the presence and location of a member within an irradiated field. A touch entry system and corresponding method are disclosed which utilize modulated pulses of light from light emitters, such as light emitting diodes, which are detected by corresponding light detectors, such as phototransistors. The light emitters and the corresponding light detectors are arranged around a frame to provide an irradiated field. The system utilizes circuitry to precondition a signal from the light detectors prior to analyzing the presence of a “hit”; i.e., the presence of a member within the irradiated field. The circuitry includes a differential amplifier and a programmable amplifier, which consists of a digital to analog converter, a current to voltage converter, and a gain stage, to precondition the signal from the light detectors. The portion of the circuit which detects the modulation of the signal from the light detectors is synchronized with the frequency of the modulation of the light pulses so that it detects the presence or absence of modulated light pulses. A filter portion of the circuit for providing an appropriate output signal is also disclosed, as is a circuit for sampling the ambient light strength and selectively disabling the modulation detection circuit when ambient light strength exceeds a preselected value.

대표청구항 ▼

An input detection system for detecting the presence of an element in a field having a perimeter, which comprises: a plurality of light emitters located on said perimeter of said field; a plurality of light detectors located on said perimeter of said field and aligned so that, for each light emitter there is at least one corresponding light detector; control means, connected to said light emitters and said light detectors, for selectively activating said light emitters and said light detectors, wherein when a light emitter is activated, said at least one corresponding light detector is activated; means for modulating said light emitters for producing a plurality of light pulses at a preselected frequency during the activation interval of each light emitter; signal preconditioning means responsive to a signal from said light detectors for preconditioning said signal to produce a signal preconditioning output; detecting means responsive to said signal preconditioning output for detecting light pulses, wherein said pulse detecting means are substantially synchronous with said preselected frequency of said light pulses and providing pulse detecting output; and means responsive to said pulse detecting output for selectively filtering said pulse detecting output and providing a selectively filtered output signal, whereby the output of the light detecting means is progressively processed for transmission to a microprocessor.

이 특허를 인용한 특허 (41)

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Hill, Douglas B.; Su, Scott Yu Tseng; Holmgren, David E., Pointer tracking across multiple overlapping coordinate input sub-regions defining a generally contiguous input region.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

내보내기 구분	파일저장 인쇄 메일전송
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저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
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연합인증

Modulated touch entry system and method with synchronous detection 원문보기

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Modulated touch entry system and method with synchronous detection 원문보기

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