Near infrared cut-off filter

A cut-off filter, near-infrared technology, applied in the direction of instruments, optical components, optics, etc., can solve problems such as not taking into account suppression

Active Publication Date: 2014-12-10
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the proposals disclosed in Patent Documents 1 and 2, no consideration is given to suppressing the pulsation accompanying changes in the incident angle, so if the incident angle ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0042] figure 1 It is a cross-sectional view of the near-infrared cut filter 10 (hereinafter referred to as IRCF10 ) of the first embodiment. figure 2 It is a cross-sectional view of the optical multilayer film 12 included in the IRCF10. image 3 is a cross-sectional view of the first SWPF portion 12B of the optical multilayer film 12 . Below, refer to Figure 1 ~ Figure 3 , illustrating the structure of IRCF10.

[0043] like figure 1 As shown, the IRCF 10 includes a transparent substrate 11 and an optical multilayer film 12 provided on at least one main surface of the transparent substrate 11 . In addition, the optical multilayer film 12 may be provided on one main surface of the transparent substrate 11 , or may be separately provided on each main surface of the transparent substrate 11 .

[0044] (transparent substrate 11)

[0045] The material of the transparent substrate 11 is not particularly limited as long as it can transmit light in at least the wavelength rang...

Embodiment 1

[0110] The optical multilayer film is composed of titanium oxide (high refractive index film), tantalum oxide (medium refractive index film), and silicon oxide (low refractive index film) (LMHML). In addition, the optical multilayer film has a passband with an average transmittance of 85% or more in the wavelength range of 400 to 700 nm, and an average transmittance of 10% or less in the wavelength range of 780 to 1000 nm on the near infrared side of the passband. The stop band of the region. Investigate the spectral characteristics of the optical multilayer film under the condition of 0° incidence by simulation. In the wavelength range of 400-700nm, there is no 2T at the position where the transmittance locally decreases by 5% or more. L / (T H +2T M ) of 100% (maximum), 0% (minimum), 70% of the film structure. 2T where there is no local decrease in the transmittance of the optical multilayer film by 5% or more L / (T H +2T M ) of 100% (maximum value), 0% (minimum value),...

Embodiment 2

[0115] The optical multilayer film has the same repeated lamination structure as in Example 1, except that it has a stop band in a region where the average transmittance is 10% or less in the wavelength range of 920 to 1170 nm on the near-infrared side of the above-mentioned pass band. . Investigate the spectral characteristics of the optical multilayer film under the condition of 0° incidence by simulation. In the wavelength range of 400-700nm, there is no 2T at the position where the transmittance locally decreases by 5% or more. L / (T H +2T M ) of 100% (maximum), 0% (minimum), 70% of the film structure. 2T where there is no local decrease in the transmittance of the optical multilayer film by 5% or more L / (T H +2T M ) of 100% (maximum value), 0% (minimum value), and 70% film structure are shown in Table 2 below. 2T L / (T H +2T M ) of 100% (maximum value) is 0.865, 0% (minimum value) is 0.807, and 70% is 0.847.

[0116] [Table 2]

[0117]

[0118] Figure 7 I...

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Abstract

A near infrared cut-off filter has a repeating laminated structure of a high refractive index film, a medium refractive index film and a low refractive index film; the filter has a pass band in which the mean transmissivity is at least 85% in a wavelength range of 400 to 700 nm and a stop band in which the width of the region in which the mean transmissivity in a wavelength range of 750 to 1100 nm is no more than 10% is 100 to 280 nm.

Description

Technical field [0001] The present invention relates to a near-infrared cutoff filter, and particularly to a near-infrared cutoff filter having an optical multilayer film formed on a transparent substrate. Background technique [0002] Charge Coupled Device (CCD) image sensors, Complementary Metal Oxide Semiconductor (CMOS) image sensors, etc. (hereinafter referred to as solid-state imaging devices) are used in digital cameras, digital video cameras, etc. . However, the spectral characteristics of these solid-state imaging elements have stronger sensitivity to infrared light than the human visual sensitivity characteristics. Therefore, in digital cameras, digital video cameras, etc., spectral correction based on a near-infrared cutoff filter is performed. [0003] As a near-infrared cut filter, for example, one containing Cu 2+ Near-infrared absorbing colored glass filters such as fluorophosphate-based glass that contain ions as coloring components. However, since a colo...

Claims

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Application Information

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IPC IPC(8): G02B5/28G02B5/22G02B5/26
CPCG02B5/28G02B5/208G02B5/22G02B5/26
Inventor 馆村满幸
Owner ASAHI GLASS CO LTD
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