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Near-infrared cut filter and solid-state imaging device

A cut-off filter and near-infrared technology, which can be used in instruments, image communications, televisions, etc., can solve problems such as insufficient permeability and lack of access to near-infrared cut-off filters and optical filters.

Active Publication Date: 2015-07-01
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of light-absorbing glass filters to shield light of wavelengths in the near-infrared region and the transmittance of the wavelength band (630 to 700 nm) required for brighter imaging of dark areas are not sufficient.
In addition, since there is a limit to forming a layer that does not hinder the function of the solid-state imaging device, an optical filter having a sufficient near-infrared cut filter function cannot be obtained at present.

Method used

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Examples

Experimental program
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preparation example Construction

[0197] For the preparation of the coating liquid, stirring devices such as a magnetic stirrer, an autorotation / revolution mixer, a bead mill, a planetary mill, and an ultrasonic homogenizer can be used. In order to secure high transparency, it is preferable to sufficiently stir. Stirring can be carried out continuously or intermittently.

[0198] The coating of the coating liquid can be performed by dip coating, cast coating, spray coating, spin coating, bead coating, wire bar coating, knife coating, roll coating, curtain coating, slit coating, etc. Coating methods such as die coating, gravure coating, slot reverse coating, micro gravure printing, inkjet or comma coating. In addition, a bar coating method, a screen printing method, a flexographic printing method, or the like can also be used.

[0199] The near-infrared absorbing layer 2 is formed on the glass substrate 1 by coating the above-mentioned coating liquid on the glass substrate 1 and then drying it. When the coat...

Embodiment

[0240] Hereinafter, the present invention will be described in detail based on examples. The present invention is not limited at all by the embodiments and examples described below. Examples 1 to 11 and Examples 14 to 24 are examples of the present invention, and Examples 12 and 13 and Examples 25 and 26 are comparative examples. The NIR filters of Examples 1 to 11 have the same figure 1 The cross-sectional view shown is the same as the cross-sectional view of the NIR filter. The NIR filters of Examples 14-24 have the same figure 2 The cross-sectional view shown is the same as the cross-sectional view of the NIR filter.

[0241] [1] NIR filter composed of glass substrate and near-infrared absorption layer

example 1

[0243] squaraine as NIR absorbing pigment A dye (compound (F11-2)) was mixed in a ratio of 0.6 parts by mass to 100 parts by mass of the polyester resin (manufactured by Osaka Gas Chemicals, trade name: B-OKP2, refractive index 1.63) 15 parts by mass % cyclohexanone solution, stirred and dissolved at room temperature to obtain a coating solution. Using an applicator with a gap of 30 μm, apply the obtained coating solution on a fluorophosphate glass (manufactured by Asahi Glass Co., Ltd., trade name: NF50-E) with a thickness of 0.56 mm as a base material by the die coating method, and heat at 100° C. It was heated for 5 minutes and dried to obtain a NIR filter 1 in which a near-infrared absorbing layer with a film thickness of 2.3 μm was formed. Table 2 shows the results of the transmittance (average transmittance at 400 to 550 nm and average transmittance at 650 to 720 nm) of the NIR filter 1 measured using a Hitachi, Ltd. spectrophotometer (trade name: U4100).

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Abstract

There are provided a near-infrared cut filter that effectively uses near-infrared absorbing glass and a near-infrared absorbing dye and is excellent in a near-infrared shielding property, and a high-sensitivity solid-state imaging device including the same. A near-infrared cut filter includes: a near-infrared absorbing glass substrate made of CuO-containing fluorophosphate glass or CuO-containing phosphate glass; and a near-infrared absorbing layer containing a near-infrared absorbing dye (A) and a transparent resin (B), on at least one principal surface of the near-infrared absorbing glass substrate, wherein an average value of a transmittance in a 400 nm to 550 nm wavelength range is 80% or more, and an average value of a transmittance in a 650 nm to 720 nm wavelength range is 15% or less.

Description

technical field [0001] The present invention relates to a near-infrared cut filter having a near-infrared shielding effect and a solid-state imaging device having the same. Background technique [0002] In recent years, optical filters that sufficiently transmit light in the visible wavelength range and shield light in the near-infrared wavelength range have been used in various applications. [0003] For example, solid-state imaging elements (CCD, CMOS, etc.) are used in imaging devices such as digital still cameras and digital video cameras. In order to make the sensitivity of the solid-state imaging device close to that of human vision, an optical filter is arranged between the imaging lens and the solid-state imaging device. [0004] Among them, as an optical filter for an imaging device, there are known near-infrared-absorbing glasses in which CuO or the like is added to fluorophosphate-based glass or phosphate-based glass in order to selectively absorb light in the ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/22C08K5/3437C08L101/12G02B5/28
CPCC03C2217/73G02B5/226C03C3/17G02B5/208C03C3/16G02B5/223C03C17/42H04N5/357C03C3/247C03C2217/70C03C2218/365C03C4/082C03C3/19C08K5/3437G02B1/04G02B5/281H04N5/335C03C2204/00C08L67/00C08L101/12H04N23/11H04N25/00H04N25/60
Inventor 小西哲平有嶋裕之盐野和彦保高弘树长谷川诚下田博司小森敦生驹文
Owner ASAHI GLASS CO LTD
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