WO2014163405A1 - 근적외선 커트 필터 및 이를 포함하는 고체 촬상 장치 - Google Patents
근적외선 커트 필터 및 이를 포함하는 고체 촬상 장치 Download PDFInfo
- Publication number
- WO2014163405A1 WO2014163405A1 PCT/KR2014/002870 KR2014002870W WO2014163405A1 WO 2014163405 A1 WO2014163405 A1 WO 2014163405A1 KR 2014002870 W KR2014002870 W KR 2014002870W WO 2014163405 A1 WO2014163405 A1 WO 2014163405A1
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- WO
- WIPO (PCT)
- Prior art keywords
- infrared cut
- cut filter
- near infrared
- transmittance
- layer
- Prior art date
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14625—Optical elements or arrangements associated with the device
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
Definitions
- the present invention relates to a near-infrared cut filter having a novel structure and a solid-state imaging device including the same.
- the camera uses a CMOS sensor to convert light into an electrical signal to produce an image.
- the newly developed BSI type (Back Side Illuminated type) CMOS sensor instead of the FSI type (Front Side Illuminated type) CMOS sensor, which has been widely used for realizing high quality images due to the high pixel resolution of the camera. Is the trend for main cameras.
- the FSI type CMOS sensor some light is blocked by forming a wiring on the top of a photodiode (PD).
- PD photodiode
- the BSI type CMOS sensor places the wiring under the photodiode so as to receive more light, thereby making the image brighter by 70% or more than the FSI type CMOS sensor. Therefore, most cameras of 8 million pixels or more adopt a BSI method.
- the reason why the BSI type CMOS sensor has such an advantage is that more incident light reaches the photodiode than the FSI type CMOS sensor.
- the reason that more incident light arrives is because the structure is improved to accommodate light having a relatively large angle of incidence.
- the incident angle range of the incident light is widened in the process of improving the structure to accommodate more incident light in the photodiode of the camera.
- An object of the present invention is to provide a near-infrared cut filter that can solve the color difference according to the incident angle of the incident light.
- Another object of the present invention is to provide a solid-state imaging device including the near infrared cut filter.
- the near-infrared cut filter according to an embodiment of the present invention satisfies the following conditions (A) and (B).
- the absolute value of the difference from the longest wavelength Lb at which the transmittance for light is 30% is 25 nm or less, and
- the wavelength Ma at which the transmittance of light incident in the vertical direction to the near infrared cut filter is 50%, and the direction perpendicular to the near infrared cut filter and the angle of 30 ° The absolute value of the difference between the wavelengths Mb at which the transmittance of the incident light at 50% is 50% is 10 nm or less.
- a solid-state imaging device including the near infrared cut filter is provided.
- Such a near-infrared cut filter can prevent the shift phenomenon of the transmission spectrum according to the incident angle of light, without impairing the transmittance of the visible light region.
- FIG. 1 and 2 are cross-sectional views showing a laminated structure of a near infrared cut filter according to an embodiment of the present invention.
- FIG 3 is a cross-sectional view illustrating a laminated structure of a near infrared cut filter according to an exemplary embodiment of the present invention.
- FIG. 4 is a cross-sectional view showing a laminated structure of a near infrared cut filter according to a comparative example.
- 5 is a graph showing the light transmission spectrum of the near infrared cut filter according to an embodiment of the present invention.
- FIG. 6 is a graph showing a light transmission spectrum of a near infrared cut filter according to a comparative example.
- the near infrared cut filter according to the present invention is characterized by satisfying the following conditions (A) and (B).
- ) of the difference from the longest wavelength Lb for which the transmittance to light is 30% may be 25 nm or less, 20 nm or less, more specifically 5 nm or less.
- the near infrared cut filter may have an absolute value of a difference between La and Lb in a range of 1 to 25 nm.
- the transmittance is rapidly changed between the wavelengths La and Lb near the ultraviolet wavelength range, thereby increasing the ultraviolet cut efficiency.
- the absolute value of the difference between the wavelengths Mb such that the transmittance of the light incident to the incident light in a direction at an angle of 30 ° to 50% may be 10 nm or less, 8 nm or less, and more specifically 5 nm or less.
- the near infrared cut filter may have an absolute value of a difference between Ma and Mb in a range of 1 to 10 nm.
- the "incidence angle” is an angle of light incident on the near infrared cut filter, and means an angle formed by a direction perpendicular to the near infrared cut filter and light incident on the near infrared cut filter.
- the pixels of the solid-state imaging device increase, the amount of light of incident light required increases. Therefore, a recent solid-state imaging device needs to accommodate not only light incident in the vertical direction to the near infrared cut filter but also light incident at an angle of 30 degrees or more with respect to the vertical direction.
- the near infrared cut filter may further satisfy conditions (C) and (D).
- the average value of the transmittance for light incident in the vertical direction to the near infrared cut filter may be 80% or more, 85% or more, 90% or more, and more specifically 95% or more.
- the near-infrared cut filter may have an average value of 80 to 95% of a transmittance for light incident in a direction perpendicular to the near-infrared cut filter in a wavelength region of 430 to 600 nm.
- the transmittance in the visible light region is high and at the same time a constant transmittance in the wavelength region is shown. If the near-infrared cut filter exhibits a transmittance lower than the above range in the 430-600 nm wavelength region, the application range may be limited because the intensity of light transmitted through the filter is not sufficient.
- the average value of the transmittance for light incident in the vertical direction to the near infrared cut filter may be 15% or less, 10% or less, and more specifically 5% or less.
- the near-infrared cut filter may have an average value of 0.1 to 15% of a transmittance for light incident in a direction perpendicular to the near-infrared cut filter in a wavelength region of 750 to 1150 nm.
- the near-infrared cut filter of the present invention can effectively block light in the region of 750 to 1150 nm by applying a near-infrared cut layer having excellent near-infrared reflection performance.
- the near infrared cut filter the substrate; Ultraviolet absorbing layer; And a near infrared cut layer.
- the ultraviolet absorbing layer and the near-infrared cut layer include both structures stacked in the same direction or formed in both directions with respect to the substrate.
- the near infrared cut filter may have a structure in which an ultraviolet absorbing layer is formed on one surface of the substrate, and the near infrared cut layer is formed on an opposite surface of the substrate on which the ultraviolet absorbing layer is formed.
- the substrate may be a glass substrate or a transparent resin substrate.
- Transparent glass can be used for a glass substrate, and phosphate type glass containing CuO can be used as needed.
- glass As a board
- substrate made of a transparent resin is excellent in intensity
- distributed can be used.
- the kind of light transmissive resin is not particularly limited, and examples thereof include cyclic olefin resins, polyarylate resins, polysulfone resins, polyether sulfone resins, polyparaphenylene resins, polyarylene ether phosphine oxide resins, and poly One or more kinds of mid resin, polyetherimide resin, polyamideimide resin, acrylic resin, polycarbonate resin, polyethylene naphthalate resin, and various organic-inorganic hybrid series resins can be used.
- the ultraviolet absorbing layer may have an absorption maximum in the wavelength range of 380 to 430 nm.
- an ultraviolet absorber having an absorption maximum in the wavelength range of 380 to 430 nm, the ultraviolet light absorbing layer can be more effectively cut.
- the ultraviolet absorbing layer may have a structure in which the ultraviolet absorbent is dispersed in the resin.
- the ultraviolet absorber is not particularly limited as long as it has an absorption maximum in the 380 to 430 nm region.
- examples of the ultraviolet absorbents include ABS 407 manufactured by Exiton; UV381A, UV381B, UV382A, UV386A, VIS404A from QCR Solutions Corp; H.W.
- the kind of resin used for the ultraviolet absorbing layer is not particularly limited, and light transmitting resins mentioned as applicable to the above-mentioned transparent resin substrate can be used. Accordingly, when the substrate is formed of the light transmissive resin, since the ultraviolet absorbing layer and the linear expansion coefficient are similar, the peeling between the substrate and the ultraviolet absorbing layer is reduced compared to the case of forming the substrate from the transparent glass.
- cyclic olefin resins include ARTON of JSR, ZEONEX of ZEON, Topas of TOPAS Advanced Polymers, and polycarbonate resins of APEL of MITSUI, and polyamideimide resin of Mitubishi Rayon. Acrypet, NKK's SOXR, and TOYOBO's VYLOMAX.
- the UV absorbing layer is prepared by mixing UV386A (produced by QCR solution) and Topas 6045-04 (produced by TOPAS Advanced Polymers, COC) and toluene solvent (produced by Sigma Aldrich) to prepare a UV absorbing solution. It can be formed using an ultraviolet absorbing solution.
- the near infrared cut layer serves to reflect light in the near infrared region.
- the near-infrared cut layer is formed by alternately laminating a resin film, a high refractive index layer, and a low refractive index layer formed by, for example, dispersing a metal oxide fine particle containing an aluminum vapor deposition film, a noble metal thin film, and indium oxide as main components and adding tin oxide.
- a dielectric multilayer film can be used.
- the near-infrared cut layer may have a structure in which a dielectric layer having a first refractive index and a dielectric layer having a second refractive index are alternately stacked.
- the refractive index difference between the dielectric layer having the first refractive index and the dielectric layer having the second refractive index may be 0.2 or more, 0.3 or more, or 0.2 to 1.0.
- the dielectric layer having the first refractive index may be a layer having a relatively high refractive index
- the dielectric layer having the second refractive index may be a layer having a relatively low refractive index.
- the refractive index of the dielectric layer having the first refractive index may range from 1.6 to 2.4
- the refractive index of the dielectric layer having the second refractive index may range from 1.3 to 1.6.
- the dielectric layer having the first refractive index may be formed of one or more selected from the group consisting of titanium oxide, alumina, zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide and indium oxide.
- the indium oxide may further contain a small amount of titanium oxide, tin oxide, cerium oxide, and the like as necessary.
- the dielectric layer having the second refractive index may be formed of one or more selected from the group consisting of silica, lanthanum fluoride, magnesium fluoride, and sodium alumina fluoride.
- the method for forming the near infrared cut layer is not particularly limited, and may be performed by, for example, a CVD method, a sputtering method, a vacuum deposition method, or the like.
- a dielectric layer having a first refractive index and a dielectric layer having a second refractive index may be alternately stacked in a 5 to 61 layer, 11 to 51 layer, or 21 to 31 layer structure.
- the near infrared cut layer can be designed in consideration of a range of desired reflection to refractive index, a region of wavelength to be blocked, and the like.
- the near infrared cut filter may further include a near infrared absorbing layer containing a near infrared absorber.
- the near infrared absorbing layer may have a structure in which a near infrared absorber is dispersed in the resin. Most of the light in the near infrared region is reflected through the near infrared cut layer. However, when the angle of incidence of light becomes wider, the transmission spectrum of the near infrared cut layer may be different when light enters the near infrared cut filter vertically (incident angle 0 °) and when it has a large angle of incidence, resulting in color distortion of the image. Phenomenon occurs. Such problems can be solved by forming a near infrared absorbing layer.
- the near-infrared cut filter simultaneously forms a near-infrared cut layer and a near-infrared absorbing layer, thereby preventing deterioration of the filter.
- deterioration may occur due to the light energy absorbed by the near infrared absorbing layer.
- such a deterioration phenomenon is prevented by simultaneously forming a near infrared cut layer and a near infrared absorbing layer.
- the kind of resin which forms a near-infrared absorption layer is not specifically limited, For example, cyclic olefin resin, polyarylate resin, polysulfone resin, polyether sulfone resin, polyparaphenylene resin, polyarylene ether phosphine oxide At least one of resins, polyimide resins, polyetherimide resins, polyamideimide resins, acrylic resins, polycarbonate resins, polyethylene naphthalate resins, and various organic-inorganic hybrid series resins can be used.
- the near infrared absorbing layer may include a near infrared absorbent that satisfies the conditions (E) and (F).
- the near-infrared absorber one or more kinds of dyes, pigments, or metal complex compounds of various kinds may be used, and are not particularly limited.
- a cyanine compound, a phthalocyanine compound, a naphthalocyanine compound or a dithiol metal complex compound may be used as the near infrared absorber.
- the near-infrared absorbent may be used alone or in some cases, may be used by mixing two paper phases or by separating the two layers into two layers.
- the content of the near infrared absorber may be, for example, in a range of 0.001 to 10 parts by weight, 0.01 to 10 parts by weight, or 0.5 to 5 parts by weight based on 100 parts by weight of the resin.
- FIG. 1 is a cross-sectional view showing a laminated structure of a near infrared cut filter according to an embodiment of the present invention.
- a near-infrared cut layer 20 made of a dielectric multilayer is formed on a lower surface of the glass substrate 10.
- the near infrared cut layer 20 serves to block and reflect light in the near infrared region.
- the near infrared absorbing layer 40 is formed on the upper surface of the glass substrate 10.
- the near-infrared absorbing layer 40 includes a near-infrared absorber dispersed in a resin, and the near-infrared absorbent has an absorption maximum in the 600-800 nm wavelength region, a transmittance of 80% or more in the 430-600 nm wavelength region, and an absorption maximum.
- the absolute value of the difference between the longest wavelength Na at which the transmittance is 70% in the following wavelength range and the shortest wavelength Nb at which the transmittance is 30% in the wavelength range of 600 nm or more is 75 nm or less. .
- the ultraviolet absorbing layer 30 may be formed on the near infrared absorbing layer 40.
- the ultraviolet absorbing layer 30 has the shortest wavelength La at which the transmittance for light incident in the direction perpendicular to the near infrared cut filter is 70% in the wavelength region of 380 nm or more and the direction perpendicular to the near infrared cut filter in the wavelength region of 430 nm or less.
- the absolute value of the difference from the longest wavelength Lb at which the transmittance of the incident light is 30% is 25 nm or less, and the transmittance of light incident in the direction perpendicular to the near infrared cut filter in the wavelength region of 380 to 430 nm.
- the absolute value of the difference between the wavelength Ma at 50% and the wavelength Mb at which the transmittance is 50% for light incident in a direction perpendicular to the near infrared cut filter and at an angle of 30 ° is 15 nm or less. It is characterized by.
- an anti-reflection layer 50 may be formed on the ultraviolet absorbing layer 30.
- the anti-reflection layer 50 serves to reduce the phenomenon that the light incident to the near infrared cut filter is reflected at the interface, thereby increasing the amount of incident light to the near infrared cut filter.
- the anti-reflection layer 50 is formed to reduce surface reflection to increase efficiency and to remove interference or scattering caused by reflected light.
- the anti-reflection layer 50 may be formed by forming a thin film on the surface of a dielectric having a smaller refractive index than glass using a method such as vacuum deposition.
- the anti-reflection layer 50 may be formed by using various commercially available materials without particular limitation.
- the near infrared absorbing layer 40 is formed on the glass substrate 10 and the ultraviolet absorbing layer 30 is formed on the near infrared absorbing layer 40 has been described, but the stacking order is not limited thereto.
- the UV absorbing layer 30 may be formed on the glass substrate 10, and then the NIR absorbing layer 40 may be formed on the UV absorbing layer 30, or the antireflective layer 50 may be formed on the NIR absorbing layer 40.
- the form which further includes a near-infrared absorber in the ultraviolet absorbing layer 30 is also possible.
- the ultraviolet absorbing layer 30 and the near infrared absorbing layer 40 may be formed between the glass substrate 10 and the near infrared cut layer 20.
- the order of laminating the ultraviolet absorbing layer 30 and the near infrared absorbing layer 40 between the glass substrate 10 and the near infrared cut layer 20 may be appropriately selected as described above. Also in this case, by adding a near infrared absorber to the ultraviolet absorbing layer 30 without separately forming the near infrared absorbing layer 40, ultraviolet rays and near infrared rays can be absorbed in one layer.
- the present invention also provides a solid-state imaging device comprising the above-described near infrared cut filter.
- the near-infrared cut filter which concerns on this invention is applicable also to display apparatuses, such as a PDP.
- the present invention is more preferably applicable to a solid-state imaging device that requires a high pixel recently, for example, a camera of 8 million pixels or more.
- the near infrared cut filter according to the present invention can be effectively applied to a camera for a mobile device.
- a borosilicate glass (Schott D Schott D 263 T) was washed with a nanostrip (Nano-strip, Cyantek) to prepare a glass substrate.
- a high refractive index dielectric layer (Ti 3 O 5 ) and a low refractive index dielectric layer (SiO 2 ) were alternately deposited using an E-beam evaporator to form a near infrared cut layer.
- a high refractive index dielectric layer (Ti 3 O 5 ) and a low refractive index dielectric layer (SiO 2 ) were alternately deposited using an E-beam evaporator to form a near infrared cut layer.
- an ultrasonic cleaner In order to remove the foreign substances generated during the deposition process was cleaned using an ultrasonic cleaner.
- UV386A available from QCR Solution
- a UV absorbing dye a UV absorbing dye
- Topas 6015-04 from TOPAS Advanced Polymers, COP
- toluene from Sigma Aldrich
- the prepared ultraviolet absorbing solution was then spin coated onto the opposite side of the glass substrate on which the near infrared cut layer was formed. Specifically, using a spin coater while rotating the glass substrate at a speed of 1000 rpm or more, the ultraviolet absorbing solution was coated on the glass substrate to form an ultraviolet absorbing layer, and left for at least one day to volatilize the remaining solvent. .
- FIG. 3 it can be seen that the near-infrared blocking layer 20 is formed on the lower surface of the glass substrate 10 and the ultraviolet absorbing layer 30 is formed on the upper surface of the glass substrate 10.
- a near infrared cut filter was manufactured in the same manner as in Example, except that the ultraviolet absorbing layer was not formed.
- the laminated structure of the manufactured near infrared cut filter is shown in FIG. Referring to FIG. 4, it can be seen that the near-infrared blocking layer 21 is formed on the upper surface of the glass substrate 11.
- the light transmission spectrum of the near-infrared cut filter manufactured in the Example and the comparative example was measured, respectively.
- the light transmission spectrum was measured for the light a incident in the direction perpendicular to the near infrared cut filter and the light b incident in the direction perpendicular to the direction near the near infrared cut filter and at an angle of 30 °.
- the light transmission spectra are shown in FIGS. 5 and 6, respectively.
- FIG. 5 is a light transmission spectrum of the near infrared cut filter prepared in Example 1.
- FIG. 5 in the wavelength region of 380 to 430 nm, the wavelength Ma at which the transmittance of light incident in the direction perpendicular to the near infrared cut filter is 50%, the angle perpendicular to the near infrared cut filter, and the angle of 30 °. It can be seen that the absolute value of the difference between the wavelengths Mb at which the transmittance of the incident light in the direction of forming 50% becomes 50% is 5 nm or less.
- FIG. 6 is a light transmission spectrum of the near infrared cut filter manufactured in Comparative Example 1.
- FIG. 6 in the wavelength region of 380 to 430 nm, the wavelength Mc at which the transmittance of light incident in the vertical direction to the near infrared cut filter is 50%, the angle perpendicular to the near infrared cut filter, and the angle of 30 °. It can be seen that the absolute value of the difference between the wavelengths Md at which the transmittance for light incident in the direction of forming 50% becomes 50% exceeds 11 nm.
- the near-infrared cut filter according to the present invention can effectively prevent the shift of light according to the incident angle in the 380 to 430 nm region.
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Abstract
Description
Claims (15)
- 투과율이 하기 조건 (A) 및 (B)를 충족하는 근적외선 커트 필터:(A) 380 nm 이상 파장 영역에서 근적외선 커트 필터에 수직 방향으로 입사되는 광에 대한 투과율이 70%가 되는 가장 짧은 파장(La)과, 430 nm 이하 파장 영역에서 근적외선 커트 필터에 수직 방향으로 입사되는 광에 대한 투과율이 30%가 되는 가장 긴 파장(Lb)과의 차이의 절대치가 25 nm 이하, 및(B) 380~430 nm 파장 영역에서, 근적외선 커트 필터에 수직 방향으로 입사되는 광에 대한 투과율이 50%가 되는 파장(Ma)과, 근적외선 커트 필터에 수직한 방향과 30°의 각도를 이루는 방향에서 입사되는 광에 대한 투과율이 50%가 되는 파장(Mb)의 차이의 절대치가 10 nm 이하.
- 제 1항에 있어서,상기 근적외선 커트 필터는 조건 (C) 및 (D)를 충족하는 것을 특징으로 하는 근적외선 커트 필터:(C) 430~600 nm 파장 영역에서, 근적외선 커트 필터에 수직 방향으로 입사되는 광에 대한 투과율의 평균치가 80% 이상; 및(D) 750~1150 nm 파장 영역에서, 근적외선 커트 필터에 수직 방향으로 입사되는 광에 대한 투과율의 평균치가 15% 이하.
- 제 1항에 있어서,상기 근적외선 커트 필터는,기판; 자외선 흡수층; 및 근적외선 커트층을 포함하는 것을 특징으로 하는 근적외선 커트 필터.
- 제 3항에 있어서,자외선 흡수층은 상기 기판의 일면 상에 형성되고,근적외선 커트층은 자외선 흡수층이 형성된 기판의 반대면에 형성된 것을 특징으로 하는 근적외선 커트 필터.
- 제 3항에 있어서,근적외선 흡수제를 함유하는 근적외선 흡수층을 더 포함하는 것을 특징으로 하는 근적외선 커트 필터.
- 제 5항에 있어서,상기 근적외선 커트 필터는,상기 기판의 일면 상에 상기 자외선 흡수층 및 근적외선 흡수층이 형성된 것을 특징으로 하는 근적외선 필터.
- 제 6항에 있어서,상기 자외선 흡수층은 상기 적외선 흡수층 상에 형성된 것을 특징으로 하는 근적외선 필터.
- 제 3항에 있어서,상기 기판은 유리 기판인 것을 특징으로 하는 근적외선 커트 필터.
- 제 3항에 있어서,상기 기판은 투명 수지제 기판인 것을 특징으로 하는 근적외선 커트 필터.
- 제 3항에 있어서,상기 자외선 흡수층은 380~430 nm 파장 영역에서 흡수 극대를 가지는 자외선 흡수제를 포함하는 것을 특징으로 하는 근적외선 커트 필터.
- 제 10항에 있어서,상기 자외선 흡수층은 600~800 nm 파장 영역에서 흡수 극대를 갖는 근적외선 흡수제를 더 포함하는 것을 특징으로 하는 근적외선 커트 필터.
- 제 3항에 있어서,상기 근적외선 커트층은 제1 굴절률을 가지는 유전체층과 제2 굴절률을 가지는 유전체층이 교대 적층된 구조이며,제1 굴절률과 제2 굴절률의 차이는 0.2 이상인 것을 특징으로 하는 근적외선 커트 필터.
- 제 12항에 있어서,상기 근적외선 커트층은 제1 굴절률을 가지는 유전체층과 제2 굴절률을 가지는 유전체층이 5 내지 61층 구조로 교대 적층된 것을 특징으로 하는 근적외선 커트 필터.
- 제 5항에 있어서,상기 근적외선 흡수층은 조건 (E) 및 (F)를 만족하는 흡수제를 포함하는 것을 특징으로 하는 근적외선 커트 필터:(E) 600~800 nm 파장 영역에서 흡수 극대가 있고, 430~600 nm 파장 영역에서 투과율이 80% 이상이고,(F) 흡수 극대 이하의 파장 영역에서 투과율이 70%가 되는 가장 긴 파장(Na)과, 600 nm 이상의 파장 영역에서 투과율이 30%가 되는 가장 짧은 파장(Nb)과의 차이의 절대값이 75 nm 이하.
- 제 1 항 내지 제 14 항 중 어느 하나의 항에 따른 근적외선 커트 필터를 포함하는 고체 촬상 장치.
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US10082610B2 (en) | 2018-09-25 |
US20160139308A1 (en) | 2016-05-19 |
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