[특허]Broad band pass filter including metal layers and dielectric layers of alternating refractive index

Broad band pass filter including metal layers and dielectric layers of alternating refractive index 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G02B-007/18 G02B-005/28
출원번호	US-0046232 (1993-04-13)
발명자 / 주소	Austin R. Russel (Novato CA)
출원인 / 주소	Photran Corporation (Lakeville MN 02)
인용정보	피인용 횟수 : 91 인용 특허 : 0

초록 ▼

A visible light transmitting, near-infrared reflecting filter for a substrate, comprises a central group of layers (26) including two metal layers (32 and 36) separated by a spacer-layer (34) and bounded by admittance-matching layers (32 and 38). The spacer-layer has an optical thickness of less than one-half wavelength of visible light and the admittance-matching layers have an optical thickness of less than one-quarter wavelength of visible light. On each side of the central group is a group of layers (24 and 28) for boosting near infrared reflectivity of the filter, and for providing low reflection and high transmission for visible light. Each of these near-infrared-reflection-boosting groups including a high refractive index layer (40 and 42) and at least one low refractive index layer (46 and 48). The high index layer has an optical thickness of about one-quarter wavelength at a near-infrared wavelength, and the low refractive index layer has a refractive index of less than one-quarter wavelength at the near-infrared wavelength.

대표청구항 ▼

An optical interference filter for a substrate, comprising: ten layers, said layers designated the first through the tenth in consecutive numerical order beginning with the layer furthest from the substrate; said first layer of a material having a low refractive index and having an optical thickness of about one-eighth wavelength at a first wavelength in the near-infrared spectral region; said second and tenth layers of a material having a high refractive index and having an optical thickness of about one-quarter wavelength at said first wavelength; said third and ninth layers of a material having a low refractive index and having an optical thickness between one-quarter and one eighth wavelength at said first wavelength; said fourth and eighth layers of a material having a high refractive index and having an optical thickness of less than one-quarter wavelength at a second wavelength in the visible spectrum; said fifth and seventh layers being metal layers and having a thickness between about 12.5 and 30.0 nanometers; said sixth layer of a material having a high refractive index and having an optical thickness less than one-half wavelength at said second wavelength; said first wavelength being between about 800 and 1250 nanometers and said second wavelength being between about 480 and 560 nanometers; and said high refractive index being between about 1.65 and 2.65 at a wavelength of about 520 nm and said low refractive index being between about 1.35 and 1.65 at a wavelength of about 520 nm.

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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

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연합인증

Broad band pass filter including metal layers and dielectric layers of alternating refractive index 원문보기

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Broad band pass filter including metal layers and dielectric layers of alternating refractive index 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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