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Near infrared cut-off filters

A technology of cut-off filtering and near-infrared light, applied in optics, optical components, instruments, etc., can solve the problems of difficult to achieve thinning, limit the miniaturization of the camera body, etc., and achieve the effect of low cost

Active Publication Date: 2012-07-18
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0005] In the structure of the above-mentioned optical functional parts, in order to obtain various characteristics, there are restrictions on the thickness of the parts, so it is difficult to achieve thinning, and as a result, there are problems such as restrictions on the miniaturization of the camera body.

Method used

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Embodiment Construction

[0033] Next, embodiments of the near-infrared cut filter of the present invention will be described. figure 1 and figure 2 It is a cross-sectional view of each embodiment in which the near-infrared cut filter 1 of the present invention is mounted on a solid-state imaging device package 4 .

[0034] The near-infrared cut filter 1 has a rectangular plate-like appearance, and consists of a substrate glass 2 that can transmit visible light and cut off near-infrared rays, and a film-shaped attenuation layer 3 that is provided on the light-transmitting surface of the substrate glass 2 that faces the solid-state imaging device 5 . constitute. The substrate glass 2 emits α-rays due to the inclusion of radioactive isotopes as impurities in the glass composition, but the α-rays are attenuated by the thin-film attenuation layer 3 formed on the substrate glass 2 . Thus, even if the near-infrared cut filter 1 using the substrate glass 2 that emits α-rays is mounted on the solid-state im...

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Abstract

Provided is an inexpensive near infrared cut-off filter which, by being provided with a thin-film attenuation layer that effectively blocks a rays emitted from substrate glass and that is in a form so as to not influence optical characteristics, can even be used as cover glass for a solid state imaging sensor package. The thin-film attenuation layer for attenuating a rays emitted from substrate glass is formed on at least one light-permeable surface of substrate glass produced from fluorophosphate glass containing CuO or phosphate glass containing CuO.

Description

technical field [0001] The present invention relates to a near-infrared cut filter that can be used for a cover glass for a solid-state imaging device package that is attached to the front opening of a package housing a solid-state imaging device and protects the solid-state imaging device. The element is also used as a light-transmitting window. Background technique [0002] In recent years, with the rapid development of miniaturization, thinning and low price of cameras with optical functional components equipped with solid-state imaging elements such as CCD or CMOS, the optical functional components represented by camera components are also miniaturized. Minimization and thinning or reduction of parts. [0003] Such optical functional components are mainly composed of the following components: a lens made of glass or plastic material for concentrating and introducing an image into a solid-state imaging element, a near-infrared cut filter containing a metal complex for co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/22H01L27/14
CPCH01L27/14625G02B5/208H01L27/14618H01L31/0232H01L2924/0002H01L31/02325H01L2924/00
Inventor 上条克司星野创
Owner ASAHI GLASS CO LTD
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