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Optical filter and information acquisition device

A filter and spectrum technology, applied in the field of information acquisition devices and filters, can solve problems such as noise, and achieve the effect of suppressing flare, remarkable effect and excellent reproducibility

Active Publication Date: 2020-11-13
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are the following problems: the incident angle dependence of the spectral transmittance curve changing according to the incident angle; light leakage that increases the transmittance of near-infrared light at high incident angles in order to obtain high reflectivity; Noise caused by near-infrared light

Method used

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Examples

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Effect test

Embodiment

[0206] Next, the present invention will be described more specifically by way of examples. However, the present invention is not limited to the following description.

[0207] In Examples, pigments used in the absorbing layer were synthesized as follows.

[0208] (NIR pigment)

[0209] As the dye (A), dye (A11-1B), dye (A12-1B), and dye (A22-1P) were synthesized by the method described in Dyes and pigments (Dyes and pigments) 73 (2007) 344-352. In addition, a dye (II-3-2) was synthesized by the method described in International Publication No. 2017 / 135359.

[0210] (UV pigment)

[0211] As a UV dye, a merocyanine dye (M-2) represented by formula (M-2) was synthesized and prepared by a conventional method. Maximum absorption wavelength λ measured by dissolving merocyanine (M-2) in methylene chloride 最大(U)DCM 396nm.

[0212]

[0213] Dissolve the above-mentioned pigment (A) in dichloromethane, measure the light absorption spectrum with a wavelength of 400nm to 1100nm, a...

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Abstract

The present invention relates to an optical filter and an information acquisition device provided with the optical filter. The optical filter is provided with an absorption layer, a reflection layer,and a transparent substrate, and has, in a spectral transmittance curve at an incident angle of 0 DEG: a wavelength at which transmittance becomes 50% in a wavelength region of 640-760 nm; an averagetransmittance of 3% or less at wavelengths of 750-1100 nm; a wavelength at which transmittance becomes 50% in a wavelength region of 400-420 nm; an average transmittance of 68% or more at wavelengthsof 640-660 nm; and a minimum transmittance of 65% or more.

Description

technical field [0001] The present invention relates to an optical filter that sufficiently transmits light in the visible wavelength range and blocks light in the near-infrared wavelength range, and an information acquisition device having the optical filter. Background technique [0002] In recent years, an in-vehicle system equipped with information equipment such as a camera is known to transmit and receive information signals such as road conditions through a glass plate (for example, a windshield of a vehicle). These in-vehicle systems are becoming more advanced year by year. By analyzing the captured images and information signals of the subjects obtained by information acquisition devices such as cameras and sensors, they can identify oncoming vehicles, vehicles in front, pedestrians, traffic signs, and lane classification. It performs various driving assistance, such as informing the driver of dangers such as boundary lines. [0003] On the other hand, cameras usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/22B32B7/023B32B17/10B32B27/18C09B23/14C09B57/00G02B5/28
CPCB32B7/023B32B17/10B32B27/18C09B23/14C09B57/00G02B5/28G02B5/22
Inventor 长谷川诚盐野和彦长田崇
Owner ASAHI GLASS CO LTD
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