WO2015034217A1 - Filtre optique et dispositif d'imagerie le comprenant - Google Patents

Filtre optique et dispositif d'imagerie le comprenant Download PDF

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Publication number
WO2015034217A1
WO2015034217A1 PCT/KR2014/008109 KR2014008109W WO2015034217A1 WO 2015034217 A1 WO2015034217 A1 WO 2015034217A1 KR 2014008109 W KR2014008109 W KR 2014008109W WO 2015034217 A1 WO2015034217 A1 WO 2015034217A1
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Prior art keywords
optical filter
light
wavelength
transmittance
layer
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PCT/KR2014/008109
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English (en)
Korean (ko)
Inventor
김주영
양선호
진홍석
이민수
Original Assignee
주식회사 엘엠에스
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Priority claimed from KR20140016094A external-priority patent/KR101474902B1/ko
Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Priority to US14/917,018 priority Critical patent/US10670785B2/en
Priority to CN201480049125.1A priority patent/CN105518493B/zh
Publication of WO2015034217A1 publication Critical patent/WO2015034217A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes

Definitions

  • the present invention relates to an optical filter and an imaging device including the same.
  • An imaging device such as a camera uses a CMOS sensor to convert incident 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.
  • BSI type CMOS sensor some light is blocked by forming a wiring on the top of a photodiode (PD).
  • the BSI-type CMOS sensor can receive more incident light than the FSI-type CMOS sensor by placing the wiring under the photodiode so as to receive more light, thereby brightening the image by 70% or more.
  • cameras of 8 million pixels or more are mostly BSI type CMOS sensors.
  • Such a BSI type CMOS sensor can be structurally reached to a photodiode having a larger angle of incidence than an FSI type CMOS sensor.
  • the CMOS sensor can detect the light intensity in the wavelength region which cannot be seen by the naked eye.
  • the light of the wavelength region causes distortion of the image, and thus looks different in color.
  • an optical filter is used in front of the CMOS sensor.
  • the transmission spectrum of the optical filter is changed as the angle of incidence of the light is changed, which causes a problem of distortion of the image.
  • Patent Document 1 Japanese Laid-Open Patent No. 2008-106836
  • an object of the present invention is to provide an optical filter capable of improving color reproducibility by eliminating color differences according to incident angles of light.
  • Another object of the present invention is to provide an imaging device including the optical filter.
  • An optical filter comprising a light absorbing layer and a near infrared reflecting layer
  • the light absorption layer has an absorption maximum in the wavelength range of 670 to 720 nm
  • the wavelength at which the light transmittance of the near infrared reflecting layer is 50% is present in the range of 690 to 720 nm
  • It may include an optical filter characterized in that to satisfy the following equation (1).
  • ⁇ E * denotes a color difference between light incident in the vertical direction of the optical filter and transmitted through the optical filter and light incident at an angle of 30 ° with the vertical direction of the optical filter and transmitted through the optical filter.
  • it may include an imaging device comprising a broad filter according to the present invention.
  • Such an optical filter can prevent a shift phenomenon of the transmission spectrum of the optical filter due to the change in the incident angle of light without impairing the transmittance of the visible light region.
  • FIG. 1 is a cross-sectional view showing a laminated structure of an optical filter according to an embodiment of the present invention.
  • 2 and 6 are graphs showing light transmittance spectra of optical filters according to the present invention, respectively, in one embodiment.
  • FIG. 7 and 8 are graphs showing light transmittance spectra of an optical filter according to a comparative example, respectively.
  • FIG 9 is a graph showing ⁇ E * according to the absorption maximum wavelength ⁇ of the light absorption layer and the thickness of the light absorption layer of the optical filter according to the embodiment.
  • the "incidence angle” means an angle at which light incident on the optical filter is perpendicular to the optical filter. As the number of pixels of the imaging device is increased, the amount of incident light required also increases. Therefore, the recent imaging apparatus needs to accommodate not only light incident in the vertical direction to the optical filter but also light having 30 degrees or more with respect to the angle formed with the vertical direction.
  • ⁇ E * means light incident in the vertical direction of the optical filter and transmitted through the optical filter, and light incident at an angle of 30 ° with the vertical direction of the optical filter and transmitted through the optical filter. It means color difference.
  • the light transmitted through the optical filter can be divided into components that are substantially parallel to the incident light and scattered components.
  • the transmittance of the components substantially parallel to the incident light is called transmittance
  • the transmittance of the scattered components is called diffuse transmittance.
  • the transmittance of light is a concept including a transmittance of permeability and diffusion, but in the present invention, the transmittance of light is used as a concept that means only transmittance.
  • ⁇ E * is a concept used in the CIE Lab color space, which is a color value defined by CIE (Commission Internationale de l'Eclairage), and this concept is used in the present invention.
  • the CIE Lab color space is a color coordinate space capable of expressing color differences that can be detected by human eyesight. The distance between two different colors in the CIE Lab color space is designed to be proportional to the color difference perceived by humans.
  • the color difference in the CIE Lab color space means the distance between two colors in the CIE Lab color space. In other words, the farther the distance, the larger the color difference, and the shorter the distance, the less the color difference. This color difference can be represented by ⁇ E * .
  • L * any position in the CIE color space is represented by three coordinate values: L * , a * , b * .
  • a * indicates whether the color with the corresponding color coordinates is pure magenta or pure green, and b * indicates that the color with the color coordinates is pure yellow and pure blue ( pure blue).
  • a * ranges from -a to + a.
  • the maximum value of a * (a * max) denotes the pure magenta (pure magenta), minimum value (a * min) of a * indicates a pure green (pure green). For example, if a * is negative, the color is pure green, and positive is the color of pure magenta.
  • b * ranges from -b to + b.
  • b * max value (b * max) represents a pure yellow color (pure yellow)
  • a negative b * means a pure yellow color
  • the color difference ⁇ E * which is an arbitrary color E1 with color coordinates of (L1 * , a1 * , b1 * ) and another arbitrary color E2 with color coordinates of (L2 * , a2 * , b2 * ), is calculated by the following equation a can do.
  • ⁇ L * in Equation a means a difference between L1 * and L2 * of color coordinates of two arbitrary colors E1 and E2.
  • ⁇ a * means the difference between a1 * and a2 * in the color coordinates of E1 and E2
  • ⁇ b * means the difference between b1 * and b2 * among the color coordinates of E1 and E2.
  • the "dynamic width of the visible light region” refers to the range of light that the CMOS sensor can faithfully express on the screen.
  • the optical filter must minimize light transmittance in the infrared region.
  • noise in CMOS sensors is mainly caused by the circuit structure, especially thermal noise. Since the light in the infrared region passing through the optical filter acts as a major cause for the heat generation of the CMOS sensor, the optical filter should minimize the light transmittance in the infrared region.
  • the present invention relates to an optical filter, and as an example, an optical filter including a light absorbing layer and a near infrared reflecting layer, the absorption maximum wavelength of the light absorbing layer is present in the wavelength range of 670 to 720 nm, the light transmittance of the near infrared reflecting layer is 50
  • the wavelength which is% is present in the wavelength range of 690 to 720 nm, and may include an optical filter characterized in that the following Equation 1 is satisfied.
  • ⁇ E * denotes a color difference between light incident in the vertical direction of the optical filter and transmitted through the optical filter and light incident at an angle of 30 ° with the vertical direction of the optical filter and transmitted through the optical filter.
  • the light absorption layer of the optical filter has an absorption maximum in the wavelength range of 670 to 720 nm. This may be implemented by adjusting the type and content of the light absorbing agent included in the light absorbing layer.
  • the near infrared reflecting layer of the optical filter has a wavelength of 50% light transmittance within a wavelength range of 690 to 720 nm. This may be implemented by adjusting the thickness and the laminated structure of the dielectric multilayer film forming the near infrared reflecting layer.
  • ⁇ E * is a color coordinate (L1 * , a1 * , b1 * ) and the optical coordinates of light E1 incident in the vertical direction to the optical filter according to the present invention and transmitted through the optical filter. It means the color difference calculated by substituting the color coordinates L2 * , a2 * , b2 * of the light E2 incident at an angle of 30 ° with the vertical direction of the filter and passing through the optical filter.
  • the optical filter when the optical filter is implemented such that the color difference ⁇ E * is 1.5 or less, the human eye cannot perceive the distortion of the color present in the image represented by the display device.
  • the ⁇ E * may be 0.001 to 1.5, 0.001 to 1.2, 0.001 to 1.0, or 0.001 to 0.8.
  • the optical filter has a wavelength in the range of 600 to 750 nm, the transmittance of light incident in the vertical direction is 30% and the transmittance of light incident at an angle of 30 ° with respect to the vertical direction is 30%.
  • the absolute value ( ⁇ T 30% ) of the wavelength difference may be 15 nm or less.
  • This may mean the transmission of the optical filter for light in the 600 to 750 nm wavelength range. Specifically, it may mean that the absolute value of the wavelength difference at which the transmittance of light incident in the vertical direction with respect to the optical filter and light incident at an angle of 30 ° with respect to the vertical direction is 30% is 15 nm or less.
  • the absolute value of the wavelength difference may be 1 nm to 15 nm, 1 nm to 8 nm, or 1 nm to 5 nm.
  • the optical filter may prevent the image from discoloring even when the incident angle of the light incident through the lens of the solid-state imaging device is changed, thereby enabling the same level of color reproduction as the image observed with the naked eye.
  • by controlling the absolute value of the wavelength difference within the range to minimize the color difference can be controlled to a level that can not be recognized by human eyesight.
  • the optical filter according to the present invention may have an average transmittance of 80% or more for the visible light region (450 to 600 nm).
  • the optical filter When the optical filter is applied to an imaging device, a camera module, or the like, it is preferable that the optical transmittance is high in the visible light region.
  • the optical filter has an average transmittance of 80% or more in the visible light region, the image represented by the imaging device or the camera module to which the optical filter is applied may be expressed in the same color as the image observed by the naked eye.
  • the optical filter according to the present invention may have an average transmittance of 10% or less in the infrared region (750 to 1000 nm).
  • the condition may mean that the transmittance of the optical filter with respect to light in the infrared region is 10% or less.
  • the light absorbing layer of the optical filter may include a binder resin and a light absorbing agent dispersed in the binder resin.
  • a binder resin and a light absorbing agent dispersed in the binder resin.
  • the light absorbing agent of the binder resin is easily dispersed, there is no particular limitation, and for example, cyclic olefin resin, polyarylate resin, polysulfone resin, polyethersulfone resin, polyparaphenylene resin At least one of polyarylene ether phosphine oxide resin, polyimide resin, polyetherimide resin, polyamideimide resin, acrylic resin, polycarbonate resin, polyethylene naphthalate resin, and various organic-inorganic hybrid series resins. Can be used.
  • the light absorbing agent may be used one or more of various kinds of dyes, pigments or metal complex system compounds, it is not particularly limited.
  • the light absorbing agent may be a cyanine compound, a phthalocyanine compound, a naphthalocyanine compound, or a dithiol metal complex system compound.
  • the said light absorbing agent can be used individually by 1 type, and can mix and use 2 or more types as needed.
  • the content of the light absorbing agent may be, for example, in a range of 0.001 to 10 parts by weight, 0.01 to 10 parts by weight, or 0.1 to 5 parts by weight based on 100 parts by weight of the binder resin.
  • the content of the light absorbing agent in the above range it is possible to correct the shift (shift) phenomenon of the transmission spectrum according to the angle of incidence, and implement an excellent near-infrared blocking effect.
  • the absorption wavelength range (half-width) of the light absorption layer may be increased to minimize transmission of light that may occur in the wavelength range of the near infrared region.
  • the optical filter may satisfy the following Equation 2.
  • t abs means the thickness when the light absorber layer is formed in the same area as the light absorbing layer by using the same amount of light absorbing agent contained in the light absorbing layer.
  • the light absorbing layer of the optical filter includes a binder resin and a light absorbing agent.
  • the thickness t abs when the light absorber layer is formed using the same amount of the light absorbent contained in the light absorbing layer may mean the concentration or content of the light absorbing agent in the light absorbing layer.
  • the above-described color difference ⁇ E * may be 0.8 or less.
  • the color difference may range from 0.1 to 0.8, 0.4 to 0.8, or 0.5 to 0.6.
  • ⁇ E * of the optical filter to 0.8 or less, the human eye cannot perceive the distortion of the color present in the image represented by the display apparatus including the optical filter.
  • the color difference ⁇ E * of the optical filter is changed when the reflection characteristic of the near infrared reflecting layer included in the optical filter is changed. Specifically, when the wavelength W1 of which the transmittance becomes 50% among the characteristics of the near infrared reflecting layer is changed, the color difference ⁇ E * is changed. In this case, optimizing W1 such that ⁇ E * ) has a minimum value can prevent distortion of the image.
  • the light absorbing layer may have a thickness in the range of 1 to 100 ⁇ m.
  • the thickness of the light absorption layer may be in the range of 1 to 10 ⁇ m, 3 to 20 ⁇ m, or 5 to 30 ⁇ m.
  • the optical filter may satisfy Equation 3 below.
  • W1 means a wavelength in the wavelength range of 600 to 800 nm, the transmittance of the near-infrared reflecting layer to the light incident in the direction perpendicular to the optical filter is 50%,
  • W2 means the absorption maximum wavelength of the light absorption layer.
  • the wavelength, that is, the difference between the wavelengths W2 at which the light absorbing layer has the lowest transmittance may be 20 nm or less.
  • the W2-W1 may be 0 to 20 nm, 5 to 15 nm or 10 to 13 nm.
  • the near-infrared reflecting layer by reflecting a part of the light incident to the light absorbing layer by the near-infrared reflecting layer, it is possible to prevent problems such as deterioration of the optical filter or efficiency degradation of the optical filter that may be generated due to the light absorbing layer absorbs excessive amounts of light.
  • the optical filter may satisfy Equation 4 below.
  • W1 means a wavelength in the wavelength range of 600 to 800 nm, the transmittance of the near-infrared reflecting layer with respect to light incident in the direction perpendicular to the optical filter is 50%,
  • W2 means the absorption maximum wavelength of the light absorption layer
  • W3 means the absolute value of the difference between the two wavelengths in which the light absorption layer has a transmittance of 50% in the wavelength range of 600 nm or more.
  • Equation 4 is a wavelength (W1) of the light transmittance of the near-infrared reflecting layer 50% to the light incident in the direction perpendicular to the optical filter in the 600 to 800 nm wavelength range, the light absorbing layer has an absorption maximum
  • W1- (W2-W3 / 2) value may have a range of 1 to 65 nm, 5 to 40, or 10 to 30 nm.
  • W1- (W2-W3 / 2) by adjusting the value of W1- (W2-W3 / 2) within the above range, it is possible to minimize the transmittance of light in the near infrared region.
  • the W1- (W2-W3 / 2) value is less than 0 nm, the shift of the transmission spectrum of the optical filter due to the change of the incident angle may not be prevented, and the transmittance of light in the near infrared region may increase, thereby displaying the display.
  • the user can recognize the distortion of the color present in the image represented by the device.
  • the W1- (W2-W3 / 2) value exceeds 65 nm
  • the formulation stability of the light absorbing layer may be impaired, but rather the distortion of the image by inhibiting the light transmittance in the visible light region contributing to the generation of the image. Can be generated.
  • Equations 2 to 4 together with Equation 1 are satisfied at the same time, even if the incident angle of the light incident on the optical filter is changed, distortion of the image can be minimized, so that color can be reduced to the same level as the image observed by the naked eye. I can reproduce it.
  • Equations 1 to 4 control the wavelength representing the absorption maximum of the light absorbing layer in the range of 670 to 720 nm, and the wavelength at which the light transmittance of the near infrared reflecting layer becomes 50% is controlled in the range of 690 to 720 nm. Can be.
  • unnecessary transmission peaks may be generated in the wavelength range of the near infrared region (700 to 750 nm) according to the absorption characteristics of the light absorption layer.
  • Equation 5 may be satisfied.
  • % T NIR-peak means the maximum transmittance in the 700 to 750 nm wavelength range.
  • the% T NIR-peak means the maximum transmittance in the wavelength range of the near infrared region
  • % T NIR-peak may be 10% or less.
  • the% T NIR-peak may be represented by 0.1% to 8%, 1% to 5% or 1% to 2% or less, preferably 0%. As the% T NIR-peak approaches 0%, the distortion of the image can be reduced.
  • the transmission spectrum of the optical filter is changed when the incident angle of light incident on the optical filter applied to the image pickup device is changed. Serious distortion occurred in the image provided by the imaging device.
  • the transmittance of light incident to the optical filter vertically and transmitted through the optical filter and light incident to the optical filter in a direction perpendicular to the optical filter at 30 ° is 50%.
  • a scheme for controlling the difference in wavelengths has been introduced.
  • the optical filter according to the present invention not only the wavelength at which the transmittance of light incident at the respective incident angles is 50% according to Equations 1 to 5, but also the transmittance of light is 30%.
  • the wavelength was controlled at the same time.
  • the optical filter of the present invention was able to further reduce the distortion of the image than the conventional optical filter.
  • the optical filter according to the present invention may include a light absorbing layer and a near infrared reflecting layer including at least one light absorbing agent. Therefore, light in the near infrared region incident on the optical filter is mostly reflected by the near infrared reflecting layer.
  • the optical filter may further include a transparent substrate formed on one surface of the light absorption layer.
  • the transparent substrate may be a transparent glass substrate or a transparent resin substrate.
  • a transparent glass substrate may be used as the transparent substrate, and if necessary, a phosphate-based glass containing copper oxide (CuO) may be used.
  • a phosphate-based glass containing copper oxide (CuO) may be used.
  • the said transparent resin substrate is excellent in intensity
  • distributed can be used.
  • the kind of light transmissive resin is not particularly limited, and a binder resin mentioned as applicable to the light absorbing layer can be used. For example, by controlling the kind of the binder resin of the light absorption layer and the resin used as the transparent substrate, the interface peeling can be reduced.
  • the near infrared reflecting layer may be formed of a dielectric multilayer.
  • the near infrared reflecting layer serves to reflect light in the near infrared region.
  • the near-infrared reflection layer can use the dielectric multilayer film etc. which alternately laminated the high refractive index layer and the low refractive index layer.
  • the near-infrared reflecting layer may include an aluminum vapor deposition film if necessary; Precious metal thin film; Or a resin film in which at least one fine particle of indium oxide and tin oxide is dispersed.
  • the near infrared reflecting 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 reflecting layer is not particularly limited, and for example, a CVD method, a sputtering method, a vacuum deposition method, or the like may be applied.
  • the near-infrared reflective 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 into 5 to 61 layers, 11 to 51 layers, or 21 to 41 layers.
  • the near-infrared reflecting layer can be designed in consideration of a range of desired transmittance to refractive index and a region of a wavelength to be blocked.
  • the near-infrared reflective layer may further include a light absorbing agent dispersed in the dielectric multilayer.
  • the light absorbing agent dispersed in the dielectric multilayer film is not particularly limited as long as it is a light absorbing agent capable of absorbing a near infrared to infrared wavelength region of 500 nm or more.
  • the thickness of the dielectric multilayer film may be manufactured to be thinner, thereby miniaturizing the device.
  • the present invention may include an imaging device including the optical filter according to the present invention.
  • the optical filter according to the present invention is also applicable to display devices such as PDPs.
  • the present invention is more preferably applicable to an imaging device that requires a high pixel, for example, a camera of 8 million pixels or more.
  • the optical filter according to the present invention can be effectively applied to a camera for a mobile device.
  • TiO 2 and SiO 2 were alternately deposited using an E-beam evaporator to form a near-infrared reflective layer to have a thickness of 4.210 ⁇ m.
  • the prepared near-infrared absorbing solution was spin coated on the opposite surface of the glass substrate on which the near-infrared reflective layer was formed to form a light absorbing layer.
  • an optical filter according to the present invention was prepared.
  • the laminated structure of the manufactured optical filter is shown in FIG. Referring to FIG. 1, a near infrared reflecting layer 20 is formed on a lower surface of the glass substrate 10, and a light absorption layer 30 is formed on an upper surface of the glass substrate 10.
  • the light transmittance experiment was performed by varying the angle of incidence of light to (a) 0 ° and (b) 30 °. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near infrared reflecting layer was changed to 4.238 ⁇ m.
  • the optical transmittance measurement experiment was performed by changing the incident angle of light to (a) 0 ° and (b) 30 ° with respect to the optical filter prepared in Preparation Example 2. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near-infrared reflection layer was changed to 4.269 ⁇ m, and the incidence angles of light with respect to the optical filter prepared in Preparation Example 3 were (a) 0 ° and (b) 30. Light transmission measurement experiments were performed at different degrees. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near infrared reflecting layer was changed to 4.299 ⁇ m.
  • the optical transmittance measurement experiment was performed by varying the angle of incidence of light to (a) 0 ° and (b) 30 ° with respect to the optical filter prepared in Preparation Example 4. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near infrared reflecting layer was changed to 4.331 ⁇ m.
  • the optical transmittance measurement experiment was performed by varying the angle of incidence of light to (a) 0 ° and (b) 30 ° with respect to the optical filter prepared in Preparation Example 5. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near infrared reflecting layer was changed to 4.073 ⁇ m.
  • the optical transmittance measurement experiment was performed by varying the angle of incidence of light to (a) 0 ° and (b) 30 ° with respect to the optical filter prepared in Comparative Example 1. The results are shown in FIG.
  • An optical filter was manufactured in the same manner as in Preparation Example 1, except that the thickness of the near infrared reflecting layer was changed to 4.110 ⁇ m.
  • the optical transmittance measurement experiment was performed by varying the angle of incidence of light to (a) 0 ° and (b) 30 ° with respect to the optical filter prepared in Comparative Example 2. The results are shown in FIG.
  • the wavelength at which the transmittance of light incident in the vertical direction to the optical filter is 30%, and the optical filter
  • the absolute value ( ⁇ T 30% ) of the difference between the wavelengths of the transmittance of 30% of the incident light in the direction perpendicular to the direction of 30 ° was measured.
  • the optical filter according to the present invention has a wavelength of 600% in the wavelength range of 600 to 750 nm, the transmittance of light incident in the direction perpendicular to the optical filter is 30%, perpendicular to the optical filter and 30 ° It can be seen that the absolute value of the difference between the wavelengths of the transmittance of 30% for light incident in the angular direction is 15 nm or less.
  • an optical maximum wavelength was prepared by varying the absorption maximum wavelength ( ⁇ ) of the light absorption layer and the thickness of the light absorption layer as shown in Table 2 below.
  • ⁇ E * was measured for each optical filter and shown in Table 2 and FIG. 9.
  • the horizontal axis represents wavelength W1 at which the transmittance of the near infrared reflecting layer is 50%
  • the vertical axis represents ⁇ E * .
  • Each graph in Fig. 9 shows ⁇ E * when the wavelength W1 at which the transmittance of the near-infrared reflecting layer is 50% is different when the light absorption layer has a predetermined absorption maximum wavelength ⁇ and thickness.
  • the wavelength W1 at which the transmittance of the near infrared reflecting layer was 50% was adjusted to be in the range of 650 to 750 nm.
  • Table 2 and FIG. 9 show ⁇ E * when the absorption maximum wavelength (W1) of the light absorption layer is different when the light absorption layer has a predetermined absorption maximum wavelength ( ⁇ ) and thickness.
  • the optical filter when the absorption maximum wavelength of the light absorbing layer exists in the 670 to 720 nm range, and the wavelength (W1) is transmittance of the near-infrared reflection layer is 50% is present in 690 to 720 nm range, the light absorption layer ⁇ E * is 1.5 It confirmed that it appeared below. As a result, even if the incident angle is changed from 0 ° to 30 ° it was confirmed that the difference in color is so low that it is not recognized by the naked eye.
  • the light having a transmittance of 30% for light incident in a direction perpendicular to the optical filter, and light incident in a direction forming an angle of 30 ° with the direction perpendicular to the optical filter The absolute value ( ⁇ T 30% ) of the difference in wavelengths for which the transmittance of the resin becomes 30% was measured.
  • W1, W2, and W3 were measured to calculate W2-W1 described in Equation 2 and W1- (W2-W3 / 2) described in Equation 3 above.
  • the wavelength (W1) that the transmittance of the near infrared reflecting layer is 50% was adjusted to exist within the range of 650 to 750 nm.
  • the thickness of the light absorption layer was measured to be different from 7, 11 and 15 ⁇ m, and the results are shown in Tables 4 to 6 below.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 670 to 750 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% in the range 690-750 nm The value was found to be less than 10 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 750 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 680 to 750 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • the W2-W1 value was found to be less than 20 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 680 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 700 to 730 nm in which the transmittance of the near infrared reflecting layer is 50%. It was shown that the value of W1- (W2-W3 / 2) in the range had a range from 20 to 65 nm.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 660 to 750 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% in the range of 680 to 750 nm. The value was found to be less than 10 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 690 to 730 nm in which the transmittance of the near infrared reflecting layer is 50%. It was shown that the value of W1- (W2-W3 / 2) in the range had a range from 20 nm to 65 nm.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 660 to 700 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% in the 680 to 720 nm range The numerical value was found to be 10 nm or less, and the value of W1- (W2-W3 / 2) was found to range from 20 nm to 65 nm.
  • the light having a transmittance of 30% for light incident in a direction perpendicular to the optical filter, and light incident in a direction forming an angle of 30 ° with the direction perpendicular to the optical filter Absolute values ( ⁇ T 30% ) and% T NIR-peak values of the wavelength difference between which the transmittance was about 30% were measured.
  • the wavelength W1 at which the transmittance of the near infrared reflecting layer was 50% was adjusted to be in the range of 650 to 750 nm.
  • the thickness of the light absorbing layer was measured to be different from 7, 11 and 15 ⁇ m, and the results are shown in Tables 7 to 9 below.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 670 to 750 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% in the 700 to 750 nm range The value was found to be less than 10 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 650 to 690 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 650 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • The% T NIR-peak value was found to be less than 10% in the range.
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 690 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 700 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% The numerical value was below 10 nm and% T NIR-peak value was below 10%.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 670 to 750 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% in the range of 680 to 750 nm. The value was found to be less than 10 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 650 to 690 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 650 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • The% T NIR-peak value was found to be less than 10% in the range.
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 690 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 680 to 710 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% The numerical value was below 10 nm and% T NIR-peak value was below 10%.
  • the optical filter of Preparation Example 1 has a wavelength at which the transmittance of the near infrared reflecting layer is 50% in the range of 660 to 700 nm
  • the optical filter of Preparation Example 6 has a wavelength at which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T in the 680 to 720 nm range 30% of The value was found to be less than 10 nm.
  • the optical filter of Preparation Example 1 has a wavelength of 650 to 700 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 650 to 720 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • % T in range NIR-peak The value was found to be less than 10%.
  • the optical filter of Preparation Example 1 has a wavelength of 660 to 700 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 680 to 720 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% The numerical value was below 10 nm and% T NIR-peak value was below 10%.
  • the light having a transmittance of 30% for light incident in a direction perpendicular to the optical filter, and light incident in a direction forming an angle of 30 ° with the direction perpendicular to the optical filter Absolute values ( ⁇ T 30% ) and% T NIR-peak values of the wavelength difference between which the transmittance was about 30% were measured.
  • ⁇ T 30% and% T NIR-peak values are the same as in Experimental Example (5-3).
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 720 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 680 to 720 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ E * values in the range were found to be 1.5 or less.
  • the optical filter of Preparation Example 1 has a wavelength of 670 to 700 nm in which the transmittance of the near infrared reflecting layer is 50%
  • the optical filter of Preparation Example 6 has a wavelength of 680 to 720 nm in which the transmittance of the near infrared reflecting layer is 50%.
  • ⁇ T 30% ,% T NIR-peak and ⁇ E * It was confirmed that the numerical value appeared within the range according to the present invention.

Abstract

La présente invention concerne un filtre optique qui comprend une couche d'absorption optique et une couche de réflexion proche infrarouge, la couche d'absorption optique comprenant un maximum d'absorption dans la plage de longueurs d'ondes de 670-720 nm, la longueur d'ondes à laquelle la transmittance de la lumière de la couche de réflexion proche infrarouge est de 50% se trouvant dans la plage de 690-720 nm, et le filtre satisfaisant la formule mathématique (1). La présente invention concerne également un dispositif d'imagerie comprenant le filtre optique. [Formule mathématique (1)] ΔE*≤1,5. Dans la formule mathématique (1), ΔE* représente la différence de couleur entre la lumière ayant pénétré dans la direction verticale du filtre optique et traversé le filtre optique, et la lumière ayant pénétré dans la direction selon un angle de 30° par rapport à la direction verticale du filtre optique et traversé le filtre optique.
PCT/KR2014/008109 2013-09-06 2014-08-30 Filtre optique et dispositif d'imagerie le comprenant WO2015034217A1 (fr)

Priority Applications (2)

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US14/917,018 US10670785B2 (en) 2013-09-06 2014-08-30 Optical filter, and imaging device comprising same
CN201480049125.1A CN105518493B (zh) 2013-09-06 2014-08-30 光学滤光片及包括该光学滤光片的摄像装置

Applications Claiming Priority (4)

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KR10-2013-0107119 2013-09-06
KR20130107119 2013-09-06
KR20140016094A KR101474902B1 (ko) 2013-09-06 2014-02-12 광학 필터 및 이를 포함하는 촬상 장치
KR10-2014-0016094 2014-02-12

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US10228500B2 (en) 2015-04-23 2019-03-12 AGC Inc. Optical filter and imaging device
US10310150B2 (en) 2015-01-14 2019-06-04 AGC Inc. Near-infrared cut filter and solid-state imaging device
US10351718B2 (en) 2015-02-18 2019-07-16 AGC Inc. Optical filter and imaging device
US10365417B2 (en) 2015-01-14 2019-07-30 AGC Inc. Near-infrared cut filter and imaging device
US10386555B2 (en) 2013-09-06 2019-08-20 Lms Co., Ltd. Optical filter, and imaging device comprising same
US10598834B2 (en) 2015-12-01 2020-03-24 AGC Inc. Near-infrared light blocking optical filter having high visible light transmission and an imaging device using the optical filter
CN112368612A (zh) * 2018-07-03 2021-02-12 株式会社Lms 指纹识别传感器用光学基板以及包括其的光学滤波器

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US10386555B2 (en) 2013-09-06 2019-08-20 Lms Co., Ltd. Optical filter, and imaging device comprising same
US10670785B2 (en) 2013-09-06 2020-06-02 Lms Co., Ltd. Optical filter, and imaging device comprising same
US10310150B2 (en) 2015-01-14 2019-06-04 AGC Inc. Near-infrared cut filter and solid-state imaging device
US10365417B2 (en) 2015-01-14 2019-07-30 AGC Inc. Near-infrared cut filter and imaging device
US10351718B2 (en) 2015-02-18 2019-07-16 AGC Inc. Optical filter and imaging device
US10745572B2 (en) 2015-02-18 2020-08-18 AGC Inc. Squarylium-based dye for near-infrared optical filter
US10228500B2 (en) 2015-04-23 2019-03-12 AGC Inc. Optical filter and imaging device
US10598834B2 (en) 2015-12-01 2020-03-24 AGC Inc. Near-infrared light blocking optical filter having high visible light transmission and an imaging device using the optical filter
CN112368612A (zh) * 2018-07-03 2021-02-12 株式会社Lms 指纹识别传感器用光学基板以及包括其的光学滤波器

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