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Optical filter and ambient light sensor

An optical filter and light source technology, applied in optics, optical components, scientific instruments, etc., can solve problems such as reduced incident light, difficulty in detecting accurate illuminance or misoperation of color tone, and adverse effects of ambient light sensor detection accuracy, etc., to achieve High OD value, high visible light transmittance, and the effect of improving detection accuracy

Inactive Publication Date: 2021-03-02
JSR CORPORATIOON
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, in response to the request for emphasizing the design of the information terminal device, it is required to reduce the transmittance of the transmission window that allows light to enter the ambient light sensor (make it a blackened appearance), but there is a problem that visible light is relatively weak compared to infrared The amount of incident light is reduced, making it difficult to detect accurate illuminance or color tone, resulting in erroneous operation
[0011] However, in a device equipped with both the biometric authentication system and the ambient light sensor as described above, the 940nm light used in the biometric authentication system may degrade the detection accuracy of the ambient light sensor. influences

Method used

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  • Optical filter and ambient light sensor

Examples

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Embodiment

[0206] Hereinafter, although an Example demonstrates this invention, this invention is not limited at all by the said Example. In addition, "part" and "%" mean "part by mass" and "% by mass" unless otherwise indicated. In addition, the measurement method of each physical property value and the evaluation method of physical property are as follows, in the measurement and evaluation using an optical filter, in principle, the light-scattering layer is made the upper side (for example, the light incident surface).

[0207]

[0208] The molecular weight of the resin is measured by the following method (a) or (b) in consideration of the solubility of each resin in a solvent and the like.

[0209] (a) Gel Permeation Chromatography (GPC) device (150C type, column: H type column produced by Tosoh (Tosoh) company, developing solvent: o-dichlorobenzene) manufactured by Waters (WATERS) Company, The weight average molecular weight (Mw) and the number average molecular weight (Mn) of sta...

Synthetic example

[0233] Compound (A) used in the following Examples and Comparative Examples was synthesized by a generally known method. As a general synthesis method, the method described in Japanese Patent No. 4740631 etc. is mentioned, for example.

Synthetic example 1

[0235] The 8-methyl-8-methoxycarbonyltetracyclo[4.4.0.1 represented by the following formula (2) 2，5 .1 7，10 ] 100 parts of dodec-3-ene (hereinafter also referred to as "DNM"), 18 parts of 1-hexene (molecular weight regulator), and 300 parts of toluene (a solvent for ring-opening polymerization reaction) were charged to the nitrogen-substituted reaction container, and the solution was heated to 80°C. Then, 0.2 parts of a toluene solution (0.6 mol / L) of triethylaluminum as a polymerization catalyst and a toluene solution (0.025 mol / L) of methanol-modified tungsten hexachloride were added to the solution in the reaction vessel 0.9 parts, and the solution was heated and stirred at 80° C. for 3 hours, thereby performing a ring-opening polymerization reaction to obtain a ring-opening polymer solution. The polymerization conversion rate in the polymerization reaction was 97%.

[0236] [chemical 7]

[0237]

[0238] 1,000 parts of the ring-opening polymer solution obtained in ...

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Abstract

The present invention addresses the problem in providing an optical filter that can improve the detection accuracy of an ambient light sensor even if a system for authenticating biometric features andthe ambient light sensor are arranged at close positions. The optical filter of the present invention has a substrate (i) and a light scattering layer formed on at least one surface of the substrate(i), and is characterized in that an OD value when measured at a wavelength of 940 nm from the direction perpendicular to the optical filter is 3 or more.

Description

technical field [0001] The invention relates to an optical filter and an ambient light sensor using the optical filter. Background technique [0002] In recent years, ambient light sensors have been developed for use in information terminal devices such as smartphones and tablet terminals. The ambient light sensor in the information terminal device is used as an illuminance sensor that senses the illuminance of the environment where the information terminal device is placed and adjusts the brightness of the display, or senses the color tone of the environment where the information terminal device is placed and adjusts the brightness of the display. A color sensor that adjusts the color tone, etc. [0003] In order to match human visual perception to the brightness or hue of the display in a natural form, it is important that only visible light reaches the ambient light sensor. For example, the ambient light sensor can make the spectral sensitivity characteristic close to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/22G01J1/02G01J1/04G02B5/26G02B5/28G03B11/00H01L31/0232
CPCG01J1/02G01J1/04G02B5/22G02B5/26G02B5/28G03B11/00H01L31/0232
Inventor 三井达郎安藤嘉彦
Owner JSR CORPORATIOON
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