WO2017146210A1 - カバーガラスの積層構造、カメラ構造、撮像装置 - Google Patents
カバーガラスの積層構造、カメラ構造、撮像装置 Download PDFInfo
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- WO2017146210A1 WO2017146210A1 PCT/JP2017/007101 JP2017007101W WO2017146210A1 WO 2017146210 A1 WO2017146210 A1 WO 2017146210A1 JP 2017007101 W JP2017007101 W JP 2017007101W WO 2017146210 A1 WO2017146210 A1 WO 2017146210A1
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- light
- cover glass
- film
- infrared light
- infrared
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
- G02B1/115—Multilayers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/18—Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/26—Reflecting filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
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- 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
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- 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
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
-
- 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
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Definitions
- This invention relates to the laminated structure of the cover glass provided in an imaging device.
- an imaging device using a solid-state imaging device that is, a so-called digital camera
- information communication devices such as personal computers (PCs), tablet PCs, and smartphones have become widespread and are used on a daily basis.
- These information communication devices often incorporate a small camera module, and at present, they may be equipped with a high-performance device in which the number of pixels of the image sensor exceeds 10 million (see FIG. 11A).
- Smartphones which are information communication devices, especially mobile communication devices, tend to be thinner and lighter, and the camera module that is the component is required to have a short length in the optical axis direction. There is a strong demand.
- an internal mechanism of an imaging apparatus essential for imaging such as a lens unit including an optical lens group, a lens carrier, an imaging device, and a magnet holder is defined as a camera module.
- a camera module including a cover glass that protects the internal mechanism of the imaging apparatus from the outside is defined as a camera structure.
- the camera module 1 is mainly composed of a lens unit 50, a lens carrier 40, a magnet holder 30, an optical filter 60, and an image sensor 70 (for example, see JP2013-153361A). ).
- the optical filter mainly plays a role of cutting light in the near infrared region.
- the human eye is sensitive to light in the visible region (visible light) with a wavelength of 380 nm to 780 nm.
- the image sensor generally has sensitivity to visible light and longer wavelength light, that is, light having a wavelength of about 1.1 ⁇ m. Therefore, if the image captured by the image sensor is used as it is as a photograph, it does not look natural to human eyes and causes a sense of discomfort. Therefore, the camera module has been configured to incorporate an optical filter (near infrared light cut filter) that cuts light in the near infrared region.
- an optical filter near infrared light cut filter
- the near-infrared light cut filter for example, glass containing phosphate or fluorophosphate that absorbs light in the near-infrared region called blue glass is used.
- the present invention intends to provide a new camera structure in which an optical filter is removed.
- the present invention is a laminated structure of a cover glass that protects an internal mechanism of an imaging device from the outside, and includes a transparent substrate that transmits light, a near-infrared light absorbing film that absorbs light in the near-infrared region, and And a near-infrared light reflecting film that reflects light in the near-infrared region.
- the cover glass that protects the internal mechanism of the imaging apparatus, for example, the digital camera from the outside can cut the light in the near infrared region, and the near infrared light is cut inside the camera. There is an effect that an image can be improved without incorporating a filter.
- the present invention provides the laminated structure of cover glass according to (1) above, wherein the transparent substrate is crystallized glass.
- the present invention provides the cover glass laminated structure according to any one of (1) and (2) above, wherein the near infrared light absorbing film contains an organic dye.
- the light absorption is not dependent on the incident angle, and in the near infrared region. There is an effect that light can be cut.
- the present invention provides the laminated structure of the cover glass according to any one of (1) to (3) above, wherein the near-infrared light reflecting film is a dielectric multilayer film.
- the human eye is sensitive to so-called visible light having a wavelength of 380 nm to 780 nm.
- the image sensor generally has sensitivity up to light having a longer wavelength, that is, light having a wavelength of about 1.1 ⁇ m, including visible light. Therefore, if the image captured by the image sensor is used as it is as a photograph, it does not look natural and causes a sense of discomfort.
- the invention of (4) above by providing the near-infrared light reflecting film by the dielectric multilayer film, light having a wavelength of 700 nm or more that cannot be absorbed by the near-infrared light absorbing film is cut. It becomes possible to acquire an image having a natural hue.
- the present invention is characterized in that the dielectric multilayer film is formed by laminating a plurality of types of oxide films having different refractive indexes, and the adjacent oxide films are different types of oxide films.
- the laminated structure of the cover glass as described in (4) above is provided.
- the wavelength of light desired to be reflected can be controlled by changing the material, the film thickness, and the number of layers constituting the oxide film.
- the cover glass that protects the camera in the device from the outside world can cut light in the ultraviolet region
- the optical lens formed of the synthetic resin that is a component of the camera is made of ultraviolet rays. It is possible to prevent deterioration due to light, and the antireflection function for light in the visible region makes it possible to capture more incident light and obtain a brighter image.
- the antireflection film is a dielectric multilayer film, and is configured by alternately laminating nitride films and oxide films. Construction.
- a nitride film has a higher hardness than an oxide film.
- the use of the nitride film as the material constituting the antireflection film has the effect of improving the scratch resistance.
- the antireflection film is formed on the light incident side with reference to the transparent substrate, and the light emission side from the side farthest from the transparent substrate with respect to the transparent substrate.
- the near-infrared light reflection film and the near-infrared light absorption film are formed, and the cover glass laminated structure according to the above (6) or (7) is provided.
- the antireflection film that reflects the light in the ultraviolet region and suppresses the reflection of the light in the visible region is provided on the light incident side.
- the near-infrared light absorbing film formed on the substrate is prevented from being deteriorated by light in the ultraviolet region.
- the near infrared light reflection film is provided on the light output side farthest from the transparent substrate, the near infrared light absorption film formed on the transparent substrate side of the near infrared reflection film is deteriorated such as moisture. There is an effect that the causative substance is difficult to enter.
- the present invention includes any one of the above (1) to (7), further comprising an antifouling coating film for preventing contamination from the outside on the outermost side where light enters.
- a laminated structure of the described cover glass is provided.
- the cover glass of the imaging device has many opportunities for contamination, such as touching clothes and fingers on a daily basis.
- contamination such as touching clothes and fingers on a daily basis.
- the image captured by the camera is deteriorated.
- the invention of the above (9) by covering the outermost side of the cover glass with the antifouling coating film, there is an effect that it is easy to remove dirt and an image with excellent image quality can always be taken.
- the imaging device is an information communication device
- the cover glass is continuously installed in a housing of the information communication device.
- the laminated structure of the cover glass as described in 1. is provided.
- an optical filter is conventionally applied to a cover glass that has mainly played a role of protecting an internal mechanism from dirt and impact.
- a cover glass that has mainly played a role of protecting an internal mechanism from dirt and impact.
- the present invention is a camera structure including a cover glass having the laminated structure of cover glasses according to the above (1) to (9), and an optical lens group disposed on the cover glass side and the cover glass And an image sensor that receives light incident through the optical lens group, and a near-infrared light cut filter that cuts light in a near-infrared region between optical paths from the optical lens group to the image sensor.
- a camera structure characterized by being not disposed.
- the overall length of the camera structure can be shortened and reduced in size, and near-infrared light is placed near the image sensor. Since no cut filter is arranged, in the manufacturing process of the near-infrared light cut filter, there is a remarkable effect that particulate dust adhering to the surface of the filter does not fall on the surface of the image sensor and deteriorate the image. Play.
- a process for arranging and assembling the near-infrared light cut filter is not required, which contributes to further cost reduction, yield improvement, and work efficiency.
- the present invention provides an image pickup apparatus having the camera structure described in (11) above.
- the present invention is a laminated structure of a cover glass that protects the internal mechanism of the imaging device from the outside, and includes a transparent substrate that transmits light and a near-infrared light reflecting film that reflects light in the near-infrared region.
- a laminated structure of cover glass is provided.
- the cover glass since the cover glass has a near-infrared light reflecting film that reflects light, an effect of preventing near-infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved.
- the cover glass that protects the internal mechanism of the imaging device from the outside can cut light in the ultraviolet region, so that an optical lens formed of a synthetic resin that is a component of the camera, etc. Can be prevented from being deteriorated by ultraviolet rays, which contributes to a longer life.
- the cover glass since the cover glass has an antireflection function that prevents reflection of light in at least the visible region, it is possible to capture more incident light and obtain a remarkable effect that a brighter image can be acquired.
- the present invention is a camera structure including a cover glass having the laminated structure of the cover glass according to the above (13) or (14), the optical lens group disposed on the cover glass side, and the cover A camera structure comprising: an imaging element that receives light incident through glass and the optical lens group; and an inner transparent plate that is disposed between the optical lens group and the imaging element and transmits light. I will provide a.
- the camera structure since the camera structure includes the inner transparent plate that is disposed between the optical lens group and the image sensor and transmits light, dust attached to the surface of the image sensor is reduced. As a result, a remarkable effect of improving the image quality can be obtained.
- the present invention provides the camera structure as described in (15) above, wherein the inner transparent plate is a synthetic resin film.
- near-infrared light that mainly cuts light in the near-infrared region near the image sensor in the optical path between the optical lens group and the image sensor.
- a light cut filter was provided.
- the near-infrared light cut filter needs to include a near-infrared light reflecting film that reflects near-infrared light and a near-infrared light-absorbing film that absorbs near-infrared light.
- near-infrared light cut filters often use a glass containing phosphate or fluorophosphate that absorbs light in the near-infrared region called blue glass, but blue glass is generally brittle, It was difficult to produce a product having a thickness of 200 ⁇ m or less with few dust particles with good yield.
- blue glass is generally brittle, It was difficult to produce a product having a thickness of 200 ⁇ m or less with few dust particles with good yield.
- the near-infrared light reflecting film must have a dielectric multilayer structure formed by sputtering or the like, and has a good uniformity on the synthetic resin film. It was difficult to form.
- a synthetic resin film can be used for the inner transparent plate.
- Synthetic resin films can be made up to a thickness of 100 ⁇ m or less, and the length of the camera structure can be shortened and thinned. As a result, the thickness of information communication equipment incorporating the camera can be further reduced. There is a remarkable effect of being able to.
- the present invention provides the camera structure described in (15) or (16) above, wherein the inner transparent plate has a thickness of 0.2 mm or less.
- the thickness of the inner transparent plate is as thin as 0.2 mm or less, the length of the camera structure can be shortened and thinned, and as a result, the thickness of the information communication device incorporating the camera can be further reduced. There is an effect that can be done.
- the antireflection layer when the antireflection layer is provided on the lens group side surface of the inner transparent plate, more incident light is taken in by the antireflection function for preventing reflection of light in at least the visible region. This makes it possible to obtain a brighter image. If an antireflection film is provided on the image sensor side of the inner transparent plate, reflected light caused by the inner transparent plate, particularly reflected light from the image sensor itself, is further reflected by the inner transparent plate and returned to the image sensor. And the image quality can be improved.
- the invention according to any one of (15) to (17), wherein the inner transparent plate includes an antireflection layer for preventing reflection of light in at least a visible region on both surfaces. Provide the camera structure.
- the micro-projection structure consisting of micro-projections formed on the surface of the inner transparent plate, the so-called moth-eye structure antireflection layer, prevents light reflection over a wide band. Therefore, according to the invention of (20), by forming the antireflection film having the moth-eye structure, the reflected light caused by the inner transparent plate is remarkably reduced over a wide band, and the image quality can be improved. Play.
- the present invention provides the camera structure as described in (18) or (19) above, wherein the antireflection layer is a coating film formed on a surface of the inner transparent plate.
- a multilayer film in which two types of thin films having different light refractive indexes are alternately laminated can form an antireflection film for light. It is known that such a multilayer film can also be obtained by applying a synthetic resin. According to the invention of the above (21), there is a remarkable effect that an inner transparent plate including an antireflection film having a stable quality in a large amount at a low cost can be produced.
- the described camera structure is provided.
- the present invention provides the camera structure as described in (21) above, wherein the near infrared light absorbing portion includes an organic dye.
- the light absorption is not dependent on the incident angle, and in the near infrared region. There is an effect that light can be cut.
- the present invention provides an imaging apparatus having the camera structure described in (15) to (23) above.
- the cover glass has a near-infrared light reflecting film that reflects light
- an effect of preventing near-infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved.
- the inner transparent plate is disposed between the optical lens group and the image sensor and transmits light, dust adhering to the surface of the image sensor can be reduced. Therefore, the image quality is improved as compared with the prior art, and there is a remarkable effect that an imaging device equipped with a small camera structure can be realized at low cost.
- a cover glass that protects an internal mechanism of an imaging device, particularly a camera included in a mobile communication device, from the outside can cut light in the near infrared region, and a near infrared light cut filter is provided inside the camera.
- the image quality of the image can be improved, and the significant effects of downsizing, cost reduction, and simplification of the assembly process can be obtained.
- (A) It is sectional drawing of the camera structure applied to the portable communication apparatus A which is an imaging device which concerns on 1st embodiment of this invention.
- (B) It is structural drawing of the cover glass with an optical filter function.
- (C) It is structural drawing of the cover glass with an optical filter function provided with two or more antireflection films.
- (A) It is a figure which shows the incident angle dependence of the spectral transmittance about a near-infrared-light reflection film.
- (B) It is explanatory drawing explaining the definition of an incident angle. It is a figure which shows the incident angle dependence of the spectral transmittance in the cover glass with an optical filter function provided with the near-infrared-light absorption film and the near-infrared-light reflection film.
- (D) It is a structure figure of the inner side transparent plate provided with the moth eye structure which exhibits a reflection preventing function on both surfaces by using a transparent synthetic resin film as a base material.
- (A) It is sectional drawing of the camera structure applied to the portable communication apparatus A which is an imaging device which concerns on 4th embodiment of this invention.
- (B) It is a structural diagram of a cover glass with a near infrared light reflection function.
- (C) It is a structure figure of the inner side transparent plate provided with two or more antireflection films by using transparent glass as a base material.
- (A) It is sectional drawing of the camera structure applied to the portable communication apparatus A which is an imaging device which concerns on 5th embodiment of this invention.
- (B) It is a structural diagram of a cover glass with a near infrared light reflection function.
- C It is a structural diagram of an inner transparent plate that includes a plurality of antireflection films and further includes a near-infrared light absorbing film.
- (A) It is sectional drawing of the camera structure applied to the portable communication apparatus A which is an imaging device which concerns on the 6th embodiment of this invention.
- (B) It is a structural diagram of a cover glass with a near infrared light reflection function.
- (C) It is a structural diagram of a plate with a near infrared light absorption function.
- D It is a structure figure of the inner side transparent plate provided with two or more antireflection films by using transparent glass as a base material.
- FIG. 1A shows a camera structure applied to the imaging apparatus according to the first embodiment of the present invention.
- the imaging device is an information communication device or a portable communication device A.
- the camera structure includes a cover glass 100 with an optical filter function and a camera module 1 housed in a housing 20 of a portable communication device A such as a smartphone from the light incident side.
- the camera module 1 includes a lens unit 50 which is an optical lens group disposed on the cover glass 100 side with an optical filter function, and an image sensor 70 that receives light incident through the cover glass 100 with the optical filter function and the lens unit 50.
- a near-infrared light cut filter that cuts light in the near-infrared region is not disposed between the optical paths from the lens unit 50 to the image sensor 70.
- the image sensor 70 and the substrate 80 are mainly configured and fixed to the smartphone housing 20.
- the connection between the image sensor 70 and the substrate 80 may be connected by wire bonding or flip chip mounting.
- a significant difference from the conventional camera structure of FIG. 11B is that the optical filter 60 (see FIG. 11B) that cuts near-infrared light, which has been conventionally required for improving the image quality, is omitted. . Instead, a filter function for cutting light in the near-infrared region has been added to the cover glass 10 that has been mainly responsible for protecting the camera module 1 conventionally. With this structure, the length D2 of the entire camera structure can be made shorter than the conventional D1 (see FIG. 11B), and the optical filter 60 is not disposed in the vicinity of the image sensor 70.
- the particulate dust (particles) adhering to the surface of the filter does not fall on the surface of the image sensor 70 and deteriorate the image.
- a process for arranging and assembling the near-infrared light cut filter 60 is not necessary, which contributes to further cost reduction, yield improvement, and work efficiency.
- the mobile communication device A can be manufactured more compactly, thinner, and more inexpensively.
- FIG. 1B shows a laminated structure of a cover glass 100 with an optical filter function that is continuously installed in the casing of the mobile communication device A and protects the camera module as an internal mechanism from the outside.
- the cover glass 100 with an optical filter function uses a crystallized glass 130 as a transparent substrate that transmits light, and an antireflection film 120 that reflects light in the ultraviolet region and suppresses reflection of light in the visible region has a crystal structure. It is formed on the light incident side with reference to the vitrified glass 130.
- An antifouling coating film 110 for preventing contamination from the outside is provided on the outermost side where light enters.
- a near-infrared light reflecting film 150 that reflects light in the near-infrared region, and near-infrared light that absorbs light in the near-infrared region.
- An absorption film 140 is formed.
- An antireflection film 120 may be further formed on the farthest side of the light emission side (see FIG. 1C).
- crystallized glass is difficult to transmit light because of large crystal particles.
- recent technological advances have made it possible to control crystal particles to nanometer size, such as the impact-resistant and high-hardness clear glass ceramics manufactured by OHARA, Inc. Company Ohara, [online], What's New> Impact Release / High Hardness Clear Glass Ceramics Release Information (Press Release Distribution), [Search February 9, 2016], Internet (URL: http: //www.ohara) -Inc.co.jp/jp/news/dl/pressrelease151216.pdf)).
- the cover glass 100 with an optical filter function is implement
- blue glass as the cover glass 100 with an optical filter function
- the near-infrared light absorbing film 140 or the near-infrared light reflecting film 150 on the sapphire glass having a high hardness to form the cover glass 100 with an optical filter function. Workability is low compared to the case of using the vitrified glass 130.
- the antifouling coating film 110 prevents fingerprint stains and sebum stains and makes it easy to wipe off the stains.
- the antifouling coating film 110 is formed of a fluorine-based coating agent or the like, and is formed on the outermost side on the light incident side in the cover glass laminated structure by coating or spraying.
- the antireflection film 120 reflects light in the ultraviolet region and suppresses reflection of light in the visible region.
- the antireflection film 120 is a dielectric multilayer film, and is configured by alternately stacking nitride films and oxide films.
- the dielectric film constituting the antireflection film 120 is formed by alternately stacking a plurality of nitride films and oxide films.
- the nitride film silicon nitride, silicon oxynitride, aluminum nitride, or the like can be used.
- the stoichiometric ratio of oxygen to nitrogen (oxygen / nitrogen) is preferably 1 or less.
- silicon oxide (SiO 2), aluminum oxide (Al 2 O 3), or the like can be used as the oxide film.
- silicon nitride or silicon oxynitride as the film of the antireflection film 120, the antireflection film 120 can be formed using the same film formation method and film formation apparatus as the near infrared light reflection film 150 described later. Process advantageous.
- the antireflection film 120 may be an oxide film instead of a nitride film.
- a material for such an oxide film in addition to silicon oxide, titanium oxide (TiO2), aluminum oxide (Al2O3), zirconium oxide (ZrO2), tantalum oxide (Ta2O5), niobium oxide (Nb2O5), or the like may be used. it can.
- TiO2 titanium oxide
- Al2O3 aluminum oxide
- ZrO2 zirconium oxide
- Ta2O5 tantalum oxide
- Nb2O5 niobium oxide
- the antireflection film 120 uses a known film formation method such as a vacuum deposition method, a sputtering method, an ion beam assisted deposition method (IAD method), an ion plating method (IP method), an ion beam sputtering method (IBS method), or the like. be able to. It is desirable to use a sputtering method or an ion beam sputtering method for forming the nitride film.
- a known film formation method such as a vacuum deposition method, a sputtering method, an ion beam assisted deposition method (IAD method), an ion plating method (IP method), an ion beam sputtering method (IBS method), or the like.
- IAD method ion beam assisted deposition method
- IP method ion plating method
- IBS method ion beam sputtering method
- the near infrared light absorption film 140 is formed on the surface of the crystallized glass 130 opposite to the antireflection film 120 described above, that is, on the image sensor 70 side of the cover glass 100 with an optical filter function.
- the near-infrared light absorbing film 140 has a function of transmitting light in the visible region and absorbing part of light from the red region to the near-infrared region.
- the near-infrared light absorbing film 140 includes an organic dye and is composed of a resin film having a maximum absorption wavelength in the range of 650 nm to 750 nm (see the broken line in FIG. 4).
- the near-infrared light absorbing film 140 is adjacent to the crystallized glass 130, it is desirable to reduce the difference in refractive index between the two to reduce the reflectance at the interface.
- an azo compound, a phthalocyanine compound, a cyanine compound, a diimonium compound, or the like can be used as the organic dye.
- Polyacryl, polyester, polycarbonate, polystyrene, polyolefin, or the like can be used as a resin material as a binder (pigment binder) constituting the near-infrared light absorbing film 140.
- the resin material may be a mixture of a plurality of resins, or may be a copolymer using a monomer of the resin.
- the resin material may be any material that has a high transmittance with respect to light in the visible region, and is selected in consideration of compatibility with an organic dye, a film formation process, cost, and the like.
- a quencher quenching dye
- a sulfur compound may be added to the resin material.
- the following method can be used to form the near infrared light absorbing film 140.
- the resin binder is dissolved in a known solvent such as methyl ethyl ketone and toluene, and the above organic dye is added to prepare a coating solution.
- this coating solution is applied to the crystallized glass 130 with a desired film thickness by, for example, spin coating, and dried and cured in a drying furnace.
- the near-infrared light reflection film 150 is a dielectric multilayer film formed by alternately laminating a plurality of dielectric materials having different refractive indexes, like the antireflection film 120.
- the dielectric multilayer film constituting the near-infrared light reflection film 150 is formed by laminating a plurality of types of oxide films having different refractive indexes, and the adjacent oxide films are different types of oxide films.
- the near-infrared light reflecting film 150 is formed by alternately stacking several tens of layers of two kinds of oxide films.
- titanium oxide TiO2
- aluminum oxide Al2O3
- zirconium oxide ZrO2
- tantalum oxide Ta2O5
- niobium oxide Nb2O5
- each oxide film is formed to have a thickness of ⁇ / 4, where ⁇ is the wavelength of light to be reflected.
- ⁇ is the wavelength of light to be reflected.
- the film may be designed so that ⁇ reflects light in the near infrared region.
- the near-infrared light reflection film 150 is also formed using the same film formation method and film formation apparatus as those of the antireflection film 120 described above.
- the human eye is sensitive to so-called visible light having a wavelength of 380 nm to 780 nm.
- the image sensor generally has sensitivity up to light having a longer wavelength, that is, light having a wavelength of about 1.1 ⁇ m, including visible light. Therefore, if the image captured by the image sensor is used as it is as a photograph, it does not look natural and causes a sense of discomfort.
- the near-infrared light absorbing film is provided with the near-infrared light reflecting film 150 made of a dielectric multilayer film.
- the near-infrared light reflection film 150 alone is used to cut light in the near-infrared region, the reflectivity greatly changes depending on the incident angle of incident light, as will be described later.
- the light transmission rate is less dependent on the incident angle of light.
- An infrared light cut filter can be configured.
- the cover glass 100 that protects the camera in the smartphone housing 20 from the outside can cut light in the ultraviolet region by the antireflection film 120, an optical lens group formed of a synthetic resin that is a component of the camera. It is possible to prevent the (lens unit 50) from being deteriorated by ultraviolet rays, and it is also possible to prevent the near-infrared light absorbing film 140 containing an organic dye from being deteriorated by ultraviolet rays. Further, the antireflection function for the light in the visible region can capture more incident light and acquire a bright image.
- the antireflection film 120 is configured by alternately laminating nitride films and oxide films. Generally, a nitride film has a higher hardness than an oxide film, and reaches a hardness of 9H or more in a pencil hardness test. Therefore, the antireflection film 120 including the nitride film has an effect of improving scratch resistance. Further, the nitride film is denser and denser than the oxide film. Since it does not contain oxygen as a component, it is not a source of oxygen.
- providing the nitride film outside the near infrared light absorbing film 140 prevents the penetration of oxygen and moisture into the near infrared light absorbing film 140, and has an effect of suppressing deterioration of the near infrared light absorbing film 140. .
- an optical filter has a large number of optical boundary surfaces.
- the lens has an advanced antireflection film. It is difficult to achieve the same transmittance as a lens with an optical filter that cuts light in the near-infrared region, and reflected light is returned to the lens side. This causes stray light that produces ghosts in the image.
- the optical filter 60 is placed in the immediate vicinity of the image sensor 70 on the optical path between the lens unit 50 and the image sensor 70, it is difficult to avoid the ghost as described above.
- the stray light as described above is not generated, so that a remarkable effect of improving the image quality is obtained.
- FIG. 2 (A) shows an experimental result on how the spectral transmittance characteristic of the near-infrared light reflecting film formed of the dielectric film depends on the incident angle of light.
- the incident angle A is defined as shown in FIG.
- T on the vertical axis represents spectral transmittance, and the unit is% (percent).
- ⁇ on the horizontal axis indicates the wavelength of light, and the unit is nm (nanometer) (the same applies to the following figures).
- the sample is obtained by alternately stacking 40 layers of titanium dioxide (TiO2) and silicon dioxide (SiO2) with a predetermined film thickness on glass.
- the broken line indicates the spectral transmittance when the incident angle of light is 30 °. From FIG. 2, it was confirmed that a significant spectral transmittance difference occurs with respect to light having a wavelength of about 700 nm, which is a red region, at light incident angles of 0 degrees and 30 degrees. If there is such a difference, the color tone of the image is greatly changed between the center and the peripheral portion of the image, which causes the final deterioration of the image quality.
- FIG. 3 shows how the spectral transmittance of the cover glass 100 with an optical filter function according to the present embodiment including both a near-infrared light absorbing film and a near-infrared reflecting film depends on the incident angle of light.
- the experimental result about whether to do is shown.
- the near-infrared light absorbing film a resin film containing an organic dye and having a thickness of 5 ⁇ m or less is used, and the near-infrared light reflecting film has the same configuration as that shown in FIG.
- the solid line indicates the spectral transmittance when the incident angle of light is 0 degree
- the broken line indicates the incident angle of light of 15 degrees
- the dashed line indicates the spectral transmittance when the incident angle of light is 30 degrees. It can be confirmed that the incident angle dependency is smaller than in the case of FIG.
- FIG. 4 shows a cover glass 100 with an optical filter function (solid line) provided with a near-infrared light absorbing film 140 and a near-infrared light reflecting film 150, and a cover glass (dashed line) on which only the near-infrared light absorbing film 140 is formed. It is the figure which compared the experimental result in the spectral transmittance measurement of the cover glass (one-dot chain line) which formed only the near-infrared-light reflection film 150.
- the configurations of the near-infrared light absorbing film 140 and the near-infrared light reflecting film 150 are the same as those in FIGS. However, all incident angles of light are 0 degree.
- the human eye mainly has sensitivity to so-called visible light having a wavelength of 380 nm to 780 nm. Therefore, when imaging is performed to an area of 800 nm or more where the imaging element 70 has sensitivity, as described above, the human eye Becomes an unnatural image.
- the near-infrared light reflection film 150 is designed to cut light having a wavelength of 700 nm or more, and a steep decrease in spectral transmittance is actually measured in the vicinity of 700 nm.
- the near-infrared light absorbing film 140 and the near-infrared light reflecting film 150 are combined to form a cover glass 100 with an optical filter function. As shown by the solid line in FIG. About 650 nm, it can confirm that the high transmittance
- FIG. 5 is a diagram showing the spectral transmittance of the cover glass with an optical filter function included in the camera structure according to the second embodiment of the present invention.
- a cover glass with a so-called dual-band optical filter function and a camera structure that can acquire images even at night are provided.
- the cover glass 100 with an optical filter function includes a near-infrared light reflecting film D having a high light transmittance for a part of light in the near-infrared region. Since the film structure of the near-infrared light reflection film D is a known technique, the description thereof is omitted.
- a dual band cover glass that transmits part of the light in the visible region and the light in the near infrared region can be realized.
- the spectral transmittance of the near-infrared light reflection film D and the dual-band cover glass represents a calculated value at a wavelength of 750 nm or more. According to the camera structure provided with such a dual band cover glass, a remarkable effect that the lane boundary line or the roadway outer line can be easily seen on the road at night can be obtained.
- FIG. 6A is a cross-sectional view of a camera structure applied to a mobile communication device A that is an imaging apparatus according to a third embodiment of the present invention.
- the camera structure includes a cover glass 210 with an optical filter function that protects the internal mechanism of the imaging apparatus from the outside and the camera module 1.
- the camera module 1 moves the lens unit 50 in the axial direction in order to realize an optical lens group that is an internal mechanism of the imaging apparatus, that is, a lens unit 50, a lens carrier 40 that holds the lens unit 50, and an autofocus function.
- An inner transparent plate 240 is provided as a base material.
- the inner transparent plate 240 has a thin plate-like structure, and covers at least a part of the surface of the image sensor 70 when the image sensor 70 is viewed from the lens unit 50 side in the axial direction.
- FIG. 6B is a structural diagram of the cover glass 210 with an optical filter function.
- the cover glass 210 with an optical filter function uses the crystallized glass 130 as a transparent substrate that transmits light, and the antireflection film 120 that reflects light in the ultraviolet region and suppresses reflection of light in the visible region is a crystal. It is formed on the light incident side with reference to the vitrified glass 130.
- An antifouling coating film 110 for preventing contamination from the outside is provided on the outermost side where light enters.
- a near-infrared light reflecting film 150 that reflects light in the near-infrared region, and near-infrared light that absorbs light in the near-infrared region.
- An absorption film 140 is formed.
- An antireflection film 120 may be further formed on the farthest side of the light emission side (see FIG. 1C).
- the cover glass 210 with an optical filter function has a laminated structure of cover glass that protects the internal mechanism of the imaging device from the outside, and includes a crystallized glass 130 that is a transparent substrate that transmits light, and light in the near infrared region. And a near-infrared light reflecting film 150 that reflects the light.
- the cover glass 210 with an optical filter function further includes an antireflection film 120 that reflects light in the ultraviolet region and at least prevents reflection of light in the visible region.
- the cover glass 210 with an optical filter function includes a near-infrared light absorbing film 140 that absorbs light in the near-infrared region, and the near-infrared light absorbing film 140 contains an organic dye.
- a camera structure applied to the mobile communication device A that is an imaging apparatus according to the third embodiment of the present invention includes the above-described cover glass 210 with an optical filter function, and an optical disposed on the cover glass 210 side with an optical filter function.
- the lens group (lens unit 50), the image sensor 70 that receives light incident through the cover glass 210 with an optical filter function and the lens unit 50, and the lens unit 50 and the image sensor 70 are arranged to transmit light.
- the manufacturing method of the near-infrared reflective film 150, the near-infrared absorption film 140, and the antireflection film 120 is the same as that of the first embodiment, description thereof is omitted.
- FIG. 6C is a structural diagram of the inner transparent plate 240 provided with a plurality of antireflection films using the transparent glass 220 as a base material.
- the inner transparent plate 240 includes an antireflection layer 230 that prevents reflection of light in at least the visible region on both surfaces of the transparent glass 220.
- the antireflection layer 230 is formed by the same method as the antireflection film 120.
- the camera structure applied to the portable communication device A that is the imaging device according to the third embodiment of the present invention is a laminated structure of a cover glass that protects the internal mechanism of the imaging device from the outside, and is transparent to transmit light.
- Crystallized glass 130 as a substrate
- near-infrared light reflection film 150 that reflects light in the near-infrared region
- antireflection film that reflects light in the ultraviolet region and prevents reflection of light in at least the visible region 120
- the image sensor 70 that receives light incident through the cover glass 210 and the optical lens group, and the transparent glass 2 that is disposed between the optical lens group and the image sensor 70 and transmits light.
- a camera structure characterized in that it comprises an inner transparent plate 240.
- the cover glass 210 with an optical filter function has the near-infrared light reflecting film 150 that reflects light.
- an effect of preventing near infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved.
- a member provided with the near-infrared light reflection film 150 in a region close to the image pickup element 70, reflection of light incident on the internal mechanism of the image pickup apparatus can be suppressed, resulting in stray light. This can significantly reduce the cause of ghosts and flares.
- the cover glass 210 with an optical filter function that protects the internal mechanism of the imaging device from the outside world is capable of emitting light in the ultraviolet region. Since it can be cut, an optical lens or the like formed of a synthetic resin that is a component of the camera can be prevented from being deteriorated by ultraviolet rays, which contributes to a longer life.
- the cover glass 210 with an optical filter function includes the antireflection film 120 that prevents reflection of light in at least the visible region, it is possible to capture more incident light and to obtain a brighter image. There is an effect.
- the near-infrared light absorbing film 140 formed on the cover glass 210 with an optical filter function has a near red color. Since organic dyes that absorb external light are included, near-infrared light is not dependent on the blue glass, which is generally used as a filter material for absorbing near-infrared light. There is an effect that light in the infrared region can be suppressed.
- the camera structure is disposed between the optical lens group and the imaging device 70 and transmits light. Since the transparent plate 240 is provided, dust adhering to the surface of the image sensor can be reduced, and as a result, a remarkable effect of improving the image quality can be obtained.
- the antireflection layer 230 that prevents reflection of light in at least the visible region is provided on both surfaces of the inner transparent plate 240. Therefore, more incident light can be captured, and reflected light caused by the inner transparent plate 240, particularly reflected light from the image sensor 70 itself, is further reflected by the inner transparent plate 240 to be captured by the image sensor 70. It is possible to prevent the image from returning to, and to improve the image quality.
- the specific structures and manufacturing methods of the near-infrared reflecting film 150, the near-infrared absorbing film 140, the anti-reflection film 120, and the anti-reflection layer 230 are the same as those in the first embodiment, description thereof is omitted.
- FIG. 6D shows a camera structure applied to the mobile communication device A that is an imaging apparatus according to the third embodiment, in which an inner transparent plate 240 using a transparent glass as a base material and a transparent synthetic resin film as a base material are used.
- This is a part of a modified embodiment in which the inner transparent plate 242 is replaced. That is, it is a structural diagram of the inner transparent plate 242 using the transparent synthetic resin film 222 as a base material and the transparent synthetic resin film having a moth-eye structure that exhibits an antireflection function on both surfaces as a base material.
- the inner transparent plate 242 having a transparent synthetic resin film as a base material has a thickness of 0.2 mm or less.
- the inner transparent plate 242 based on a transparent synthetic resin film includes a moth-eye structure 232 that prevents reflection of light in at least the visible region on both sides.
- the moth-eye structure does not reduce the reflection by using the interference effect like a dielectric multilayer film, but reduces the reflection by eliminating the interface where the refractive index changes rapidly.
- a fine protrusion structure composed of a large number of fine protrusions having a height of about several hundred nm is formed on the surface, and the repetition period of the protrusions is related to the wavelength range in which the effect of reducing reflection appears. Since the moth-eye structure is a well-known technique, the description is omitted, but in the case of this modified embodiment, for example, a transparent acrylic resin is used as the transparent synthetic resin film 222, and the anti-reflection function is formed by forming the moth-eye structure by transfer or molding. Is realized.
- the moth-eye structure 232 preferably has an antireflection function for light in the visible region, and preferably has an antireflection function for light in the ultraviolet region and light in the near infrared region.
- a multilayer film obtained by applying a synthetic resin as an antireflection layer on the surface of the transparent synthetic resin film 222 as a base material can be considered.
- a multilayer film obtained by alternately laminating two types of thin films having different light refractive indexes can form a light antireflection film. It is known that such a multilayer film can also be obtained by applying a synthetic resin.
- the inner transparent plate 240 having an antireflection film of stable quality is formed in a large quantity and at a low cost with stable quality.
- the antireflection film 232 having a moth-eye structure on both surfaces of the inner transparent plate 242 made of a transparent synthetic resin film as a base material is remarkably reduced over a wide band including the visible light region, and the image quality can be improved.
- FIG. 7A is a cross-sectional view of a camera structure applied to a mobile communication device A that is an imaging apparatus according to a fourth embodiment of the present invention.
- the camera structure includes a cover glass 215 with a near-infrared light reflecting function that reflects near-infrared light, and an inner transparent plate 240 that uses transparent glass as a base material. Since other configurations are the same as those of the third embodiment described above, description thereof is omitted.
- FIG. 7B is a structural diagram of the cover glass 215 with a near infrared light reflection function.
- the cover glass 215 with a near-infrared light reflection function uses the crystallized glass 130 as a transparent substrate that transmits light, reflects the light in the ultraviolet region, and suppresses the reflection of the light in the visible region. Is formed on the light incident side with reference to the crystallized glass 130.
- An antifouling coating film 110 for preventing contamination from the outside is provided on the outermost side where light enters.
- a near-infrared light reflecting film 150 that reflects light in the near-infrared region is formed on the light emission side with respect to the crystallized glass 130.
- An antireflection film 120 may be further formed on the farthest side of the light emission side (see FIG. 1C).
- FIG. 7C is a structural diagram of the inner transparent plate 240 that includes the transparent glass 220 as a base material and includes a plurality of antireflection layers 230.
- the inner transparent plate 240 includes antireflection layers 230 on both surfaces of the transparent glass 220.
- the camera structure applied to the mobile communication device A that is the imaging device according to the fourth embodiment of the present invention is a laminated structure of a cover glass that protects the internal mechanism of the imaging device from the outside, and is transparent to transmit light.
- Crystallized glass 130 as a substrate near-infrared light reflection film 150 that reflects light in the near-infrared region, and antireflection film that reflects light in the ultraviolet region and prevents reflection of light in at least the visible region 120, a cover glass 215 with a near infrared light reflection function, an optical lens group disposed on the cover glass 215 side with a near infrared light reflection function, a cover glass 215 with a near infrared light reflection function, and an optical lens group And an inner transparent plate 240, which is disposed between the optical lens group and the image sensor 70 and is made of a transparent glass 220 that transmits light.
- the near-infrared light reflecting film 150 in which the cover glass 215 with a near-infrared light reflecting function reflects light Therefore, an effect of preventing near-infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved. Further, since it is not necessary to place a member provided with the near-infrared light reflection film 150 in a region close to the image pickup element 70, reflection of light incident on the internal mechanism of the image pickup apparatus can be suppressed, resulting in stray light. This can significantly reduce the cause of ghosts and flares.
- the cover glass 215 with a near-infrared light reflecting function that protects the internal mechanism of the imaging device from the outside is in the ultraviolet region. Therefore, it is possible to prevent an optical lens or the like formed of a synthetic resin that is a component of the camera from being deteriorated by ultraviolet rays, which contributes to a long life. Further, since the cover glass 215 with a near-infrared light reflection function has the antireflection film 120 that prevents reflection of light in at least the visible region, more incident light can be taken in and a brighter image can be acquired. There is a remarkable effect.
- the camera structure is disposed between the optical lens group and the imaging device 70 and transmits light. Since the transparent plate 240 is provided, dust adhering to the surface of the image sensor can be reduced, and as a result, a remarkable effect of improving the image quality can be obtained.
- the antireflection layer 230 that prevents reflection of light in at least the visible region is provided on both surfaces of the inner transparent plate 240. Therefore, more incident light can be captured, and reflected light caused by the inner transparent plate 240, particularly reflected light from the image sensor 70 itself, is further reflected by the inner transparent plate 240 to be captured by the image sensor 70. It is possible to prevent the image from returning to, and to improve the image quality.
- FIG. 8A is a cross-sectional view of a camera structure applied to a mobile communication device A that is an imaging apparatus according to the fifth embodiment of the present invention.
- This camera structure includes a cover glass 215 with a near-infrared light reflecting function that reflects near-infrared light, and an inner transparent plate 244 with a near-infrared light absorbing function using transparent glass as a base material. Since other configurations are the same as those of the third embodiment described above, description thereof is omitted.
- FIG. 8B is a structural diagram of the cover glass 215 with a near infrared light reflection function.
- the cover glass 215 with a near-infrared light reflection function uses the crystallized glass 130 as a transparent substrate that transmits light, reflects the light in the ultraviolet region, and suppresses the reflection of the light in the visible region. Is formed on the light incident side with reference to the crystallized glass 130.
- An antifouling coating film 110 for preventing contamination from the outside is provided on the outermost side where light enters.
- a near-infrared light reflecting film 150 that reflects light in the near-infrared region is formed on the light emission side with respect to the crystallized glass 130.
- An antireflection film 120 may be further formed on the farthest side of the light emission side (see FIG. 1C).
- FIG. 8C includes a plurality of antireflection layers 230 that prevent reflection of light in at least the visible region, and further includes a near infrared light absorption film 140 that is a near infrared light absorption unit.
- FIG. 6 is a structural diagram of an inner transparent plate 244.
- the inner transparent plate 244 with a near infrared light absorption function uses the transparent glass 220 as a base material, and the near infrared light absorption film 140 is provided on the transparent glass 220.
- the antireflection layer 230 is formed on the light incident side with reference to the transparent glass 220, and the antireflection layer 230 and the near-infrared light absorbing film are formed on the light emission side in order from the farthest side with respect to the transparent glass 220. 140 is provided.
- the near-infrared light absorbing film 140 contains an organic dye.
- the specific structures and manufacturing methods of the near-infrared reflecting film 150, the near-infrared absorbing film 140, the anti-reflection film 120, and the anti-reflection layer 230 are the same as those in the first embodiment, description thereof is omitted.
- the inner transparent plate 244 with a near infrared light absorption function may be replaced with one similar to the inner transparent plate 242 having a transparent synthetic resin film as a base material (see FIG. 6D).
- the near-infrared light absorbing film 140 is preferably provided.
- a synthetic resin thin plate containing at least a part of an organic dye that absorbs light in the near-infrared region is used. May be.
- a so-called blue glass plate that absorbs light in the near-infrared region may be used in the same manner as a conventional near-infrared light cut filter. It can also be realized by attaching a film that cuts near-infrared light on a transparent plate.
- the near-infrared light reflecting film 150 that reflects light by the cover glass 215 with a near-infrared light reflecting function. Therefore, an effect of preventing near-infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved. Further, since it is not necessary to place a member provided with the near-infrared light reflection film 150 in a region close to the image pickup element 70, reflection of light incident on the internal mechanism of the image pickup apparatus can be suppressed, resulting in stray light. This can significantly reduce the cause of ghosts and flares.
- the cover glass 215 with a near-infrared light reflecting function that protects the internal mechanism of the imaging device from the outside is in the ultraviolet region. Therefore, it is possible to prevent an optical lens or the like formed of a synthetic resin that is a component of the camera from being deteriorated by ultraviolet rays, which contributes to a long life. Further, since the cover glass 215 with a near-infrared light reflection function has the antireflection film 120 that prevents reflection of light in at least the visible region, more incident light can be taken in and a brighter image can be acquired. There is a remarkable effect.
- the near infrared light absorbing film 140 formed on the inner transparent plate 244 with a near infrared light absorbing function is used.
- the light in the visible region is reflected on both surfaces of the inner transparent plate 244 with a near infrared light absorption function. Since the antireflection layer 230 for preventing is provided, more incident light can be captured. Reflected light caused by the inner transparent plate 244 with near infrared light absorption function, particularly reflected light from the image sensor 70 itself, is further reflected by the inner transparent plate 244 with near infrared light absorption function and returns to the image sensor 70. Since this can be prevented, there is a remarkable effect that the image quality can be improved.
- FIG. 9A is a cross-sectional view of a camera structure applied to a mobile communication device A that is an imaging apparatus according to the sixth embodiment of the present invention.
- This camera structure includes, in order from the light incident side, a cover glass 215 with a near infrared light reflecting function that reflects near infrared light, a plate 217 with a near infrared light absorbing function that absorbs near infrared light, and a transparent An inner transparent plate 240 based on glass is provided. Since other configurations are the same as those of the third embodiment, description thereof is omitted.
- FIG. 9B is a structural diagram of the cover glass 215 with a near infrared light reflection function.
- the cover glass 215 with a near-infrared light reflection function uses the crystallized glass 130 as a transparent substrate that transmits light, reflects the light in the ultraviolet region, and suppresses the reflection of the light in the visible region. Is formed on the light incident side with reference to the crystallized glass 130.
- An antifouling coating film 110 for preventing contamination from the outside is provided on the outermost side where light enters.
- a near-infrared light reflecting film 150 that reflects light in the near-infrared region is formed on the light emission side with respect to the crystallized glass 130.
- An antireflection film 120 may be further formed on the farthest side of the light emission side (see FIG. 1C).
- FIG. 9C is a structural diagram of the plate 217 with a near infrared light absorption function.
- the near infrared light absorbing plate 217 has a thin plate-like structure, includes a plurality of antireflection layers 230 that prevent reflection of light in at least the visible region, and further includes a near infrared light absorbing film 140.
- the plate 217 with an absorption function uses the transparent glass 220 as a base material, and a near infrared light absorption film 140 is provided adjacent to the transparent glass 220.
- the antireflection layer 230 is formed on the light incident side with reference to the transparent glass 220, and the antireflection layer 230 and the near-infrared light absorbing film are formed on the light emission side in order from the farthest side with respect to the transparent glass 220. 140 is provided.
- the plate 217 with a near infrared light absorption function is disposed closer to the internal structure than the cover glass 215 with a near infrared light reflection function.
- a thin plate of a synthetic resin containing at least a part of an organic dye that absorbs light in the near infrared region may be used as a base material. good.
- a so-called blue glass plate that absorbs light in the near-infrared region may be used in the same manner as a conventional near-infrared light cut filter. It can also be realized by attaching a film that cuts near-infrared light on a transparent plate.
- FIG. 9D is a structural diagram of the inner transparent plate 240 made of transparent glass and having a plurality of antireflection layers 230 using the transparent glass 220 as a base material.
- the inner transparent plate 240 includes antireflection layers 230 on both surfaces of the transparent glass 220.
- the near-infrared light reflecting film 150 in which the cover glass 215 with a near-infrared light reflecting function reflects light Therefore, an effect of preventing near-infrared light from the outside from entering the internal mechanism of the imaging apparatus can be achieved. Further, since it is not necessary to place a member provided with the near-infrared light reflection film 150 in a region close to the image pickup element 70, reflection of light incident on the internal mechanism of the image pickup apparatus can be suppressed, resulting in stray light. This can significantly reduce the cause of ghosts and flares.
- the cover glass 215 with a near-infrared light reflection function that protects the internal mechanism of the imaging device from the outside is in the ultraviolet region. Therefore, it is possible to prevent an optical lens or the like formed of a synthetic resin that is a component of the camera from being deteriorated by ultraviolet rays, which contributes to a long life. Further, since the cover glass 215 with a near-infrared light reflection function has the antireflection film 120 that prevents reflection of light in at least the visible region, more incident light can be taken in and a brighter image can be acquired. There is a remarkable effect.
- the near infrared light absorbing film 140 formed on the plate 217 with the near infrared light absorbing function includes: Since organic dyes that absorb near-infrared light are included, without using blue glass generally used as a filter material for absorbing light in the near-infrared region, light absorption is not dependent on incident angle, There is an effect that light in the near infrared region can be cut.
- the light in the visible region is reflected on both surfaces of the inner transparent plate 240 using the transparent glass 220 as a base material. Since the antireflection layer 230 is provided to prevent the incident light, more incident light can be taken in, and the reflected light caused by the inner transparent plate 240, particularly the reflected light from the image pickup device 70 itself, is further increased. It is possible to prevent the light from being reflected by 240 and return to the image sensor 70 and to improve the image quality.
- FIG. 10 is a diagram for explaining the effect of the present invention by comparing an image captured with the conventional camera structure with an image captured with the camera structure according to the third embodiment of the present invention.
- FIG. 10A is an explanatory diagram for explaining an experimental method of an experiment performed with a conventional camera structure.
- a light emitting diode having a specific center wavelength was used as a light source, and the emitted light was imaged.
- a light emitting diode having a central wavelength of 460 nm was used as the light source 300.
- a low reflective material 320 is placed in the background of the light source 300, and a high reflective material 310 is placed around the low reflective material 320.
- flare phenomenon When the lens is pointed in the direction of the light source where the light intensity is high, the phenomenon that light is repeatedly reflected on the lens surface or the like and an unnecessary image is reflected is called flare phenomenon or ghost phenomenon.
- a phenomenon in which a part of an image is excessively exposed is called a flare phenomenon, and a phenomenon in which a clear unnecessary image is reflected by repeated reflection of light on a lens surface is called a ghost phenomenon.
- the conventional camera structure includes a cover glass 350, an optical lens group 330, a near-infrared light cut filter 340, and an image sensor 70 in order from the light incident side.
- the near-infrared light cut filter 340 is disposed between the optical lens group 330 and the image sensor 70.
- FIG. 10B is a cross-sectional view of a conventional cover glass 350.
- the cover glass 350 includes the antireflection film 120 on the transparent glass 360.
- the antireflection film 120 is provided on the optical glass group 330 side of the transparent glass 360.
- FIG. 10C is a cross-sectional view of a conventional near-infrared light cut filter 340.
- the near-infrared light cut filter 340 includes a near-infrared light reflection film 390 on the light incident side with reference to the blue glass 380 as a base material, and has an antireflection layer 230 on the imaging element 70 side.
- the blue glass 380 has a function of absorbing light in the near infrared region.
- FIG. 10D is an image captured by the image sensor 70 having the conventional camera structure described with reference to FIGS. 10A to 10C.
- a petal-like ghost G is generated around the light source 300, indicating that the image quality is degraded.
- Such a ghost phenomenon can occur even when the center wavelength of the light source 300 is changed from 420 nm to 660 nm.
- FIG. 10E is an explanatory diagram for explaining an experiment method of an experiment performed with the camera structure according to the third embodiment of the present invention.
- a light-emitting diode having a central wavelength of 460 nm was used as the light source 300 in the same manner as in the above-described experiments of FIGS. 10 (A) to 10 (D).
- the camera structure according to the third embodiment of the present invention includes a cover glass 400 with an optical filter function, an optical lens group 330, an inner transparent plate 450, and an image sensor 70 in order from the light incident side.
- the inner transparent plate 450 is disposed between the optical lens group 330 and the image sensor 70.
- FIG. 10F is a cross-sectional view of the cover glass 400 with an optical filter function in the camera structure according to the embodiment of the present invention.
- the cover glass 400 with an optical filter function includes a transparent glass 360 as a base material, includes the antireflection film 120 on the light incident side with the transparent glass 360 as a reference, and a near infrared light cut layer 395 on the optical lens group 330 side. Have. Although the near-infrared light cut layer 395 is not described in detail here, it has a near-infrared light absorption film 140 and a near-infrared light reflection film 150 (see FIG. 6B).
- FIG. 10G is a cross-sectional view of the inner transparent plate 450 in the camera structure according to the embodiment of the present invention.
- the inner transparent plate 450 uses the transparent glass 360 as a base material, and the antireflection layer 230 is provided on both surfaces of the transparent glass 360.
- the specific structure and manufacturing method of the near-infrared reflecting film 150, the near-infrared absorbing film 140, and the antireflection layer 230 are the same as those in the first embodiment, description thereof is omitted.
- FIG. 10H is an image captured by the camera structure according to the embodiment of the present invention. Although strong light is received centering on the light source 300, a ghost as shown in FIG. 10D does not occur, and it can be seen that the image quality is improved.
- the laminated structure of the camera structure, the imaging device, and the cover glass according to the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. Of course.
- the cover glass laminated structure and camera structure according to the present invention to a so-called dual camera in which two camera modules used as a camera of a mobile communication device such as a smartphone are combined has a great effect.
- a dual camera usually two camera modules are arranged side by side. With a dual camera, images can be recorded under two different conditions, and these can be combined to adjust the exposure and aperture of a single-lens reflex camera.
- two optical filters are required, but if the cover glass with an optical filter function according to the present invention is used, the optical filter in the camera module can be omitted, and the assembly process is simplified. With only one cover glass, it is possible to obtain an image with better image quality than when an optical filter is used.
- a cover glass of a camera of a mobile communication device such as a smartphone is provided independently of the smartphone casing 20 as shown in FIG.
- the surface of the smartphone housing 20 is covered with a single piece of glass with a continuous optical filter function.
- a glass having a laminated structure similar to the cover glass 100 with an optical filter function, the cover glass 210 with an optical filter function, or the cover glass 215 with a near infrared light reflection function according to the first embodiment of the present invention is used. Use it.
- the order of stacking the near-infrared light absorbing film 140 and the near-infrared light reflecting film 150 may be reversed.
- the near-infrared light absorbing film 140, the near-infrared light reflecting film 150, and the crystallized glass 130 are configured in this order from the imaging element 70 side.
- a cover glass structure according to the present invention by pasting a film having a near-infrared light absorbing function, a near-infrared light reflecting function, an antireflection function, etc., to a glass or a synthetic resin film, respectively, Such a method may be used as long as the inner transparent plate can be realized.
- a thin plate of a synthetic resin containing at least a part of an organic dye that absorbs light in the near-infrared region may be used as a base material.
- a so-called blue glass plate that absorbs light in the near-infrared region may be used in the same manner as a conventional near-infrared light cut filter. It can be realized by attaching a film that cuts near infrared light on a transparent plate.
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Abstract
Description
モニウム系化合物などを用いることができる。近赤外光吸収膜140を構成するバインダー(色素の結着剤)としての樹脂材料としては、ポリアクリル、ポリエステル、ポリカーボネイト、ポリスチレン、ポリオレフィンなどを用いることができる。樹脂材料は、複数の樹脂を混合してもよく、また上記樹脂のモノマーを用いた共重合体であってもよい。また、樹脂材料は、可視領域の光に対して透過率の高いものであればよく、有機色素との相性、成膜プロセス、コスト等を考慮して選択される。また、近赤外光吸収膜140の耐紫外線性を向上させるために、樹脂材料に硫黄化合物などのクエンチャー(消光色素)を添加してもよい。
10 カバーガラス
20 スマートフォン筐体
30 マグネットホルダ
40 レンズキャリア
50 レンズユニット
60 光学フィルタ
70 撮像素子
80 基板
100 光学フィルタ機能付きカバーガラス
110 防汚コート膜
120 反射防止膜
130 結晶化ガラス
140 近赤外光吸収膜
150 近赤外光反射膜
160 入射面
170 出射面
180 測定対象
190 入射光
200 垂直軸
210 光学フィルタ機能付きカバーガラス
215 近赤外光反射機能付きカバーガラス
217 近赤外光吸収機能付きプレート
220 透明ガラス
222 透明合成樹脂フィルム
230 反射防止膜
232 モスアイ構造
240 内側透明プレート
242 透明合成樹脂フィルムを基材とした内側透明プレート
244 近赤外光吸収機能付き内側透明プレート
300 光源
310 高反射材
320 低反射材
330 光学レンズ群
340 近赤外光カットフィルタ
350 カバーガラス
360 透明ガラス
370 反射防止膜
380 ブルーガラス
390 近赤外光反射膜
395 近赤外光カット層
400 光学フィルタ機能付きカバーガラス
450 内側透明プレート
A 携帯通信機器
G ゴースト
Claims (24)
- 撮像装置の内部機構を外界から保護するカバーガラスの積層構造であって、
光を透過する透明基板と、
近赤外領域の光を吸収する近赤外光吸収膜と、
近赤外領域の光を反射する近赤外光反射膜と、
を備えることを特徴とするカバーガラスの積層構造。 - 前記透明基板は、結晶化ガラスであることを特徴とする請求の範囲1に記載のカバーガラスの積層構造。
- 前記近赤外光吸収膜には、有機色素が含まれることを特徴とする請求の範囲1または請求の範囲2に記載のカバーガラスの積層構造。
- 前記近赤外光反射膜は、誘電体多層膜であることを特徴とする請求の範囲1から請求の範囲3のいずれか一の請求の範囲に記載のカバーガラスの積層構造。
- 前記誘電体多層膜は、屈折率が互いに異なる複数種類の酸化膜を複数積層することで形成され、隣接する前記酸化膜は互いに異なる種類の酸化膜であることを特徴とする請求の範囲4に記載のカバーガラスの積層構造。
- 紫外領域の光を反射し、且つ、可視領域の光の反射を抑止する反射防止膜をさらに備えることを特徴とする請求の範囲1から請求の範囲5のいずれか一の請求の範囲に記載のカバーガラスの積層構造。
- 前記反射防止膜は、誘電体多層膜であり、且つ、窒化膜と酸化膜を交互に積層して構成されることを特徴とする請求の範囲6に記載のカバーガラスの積層構造。
- 前記透明基板を基準として、光の入射側に前記反射防止膜が形成され、且つ、
前記透明基板を基準として、光の出射側に、前記透明基板から最も遠い側から順に、
前記近赤外光反射膜と、
前記近赤外光吸収膜と、
が形成されることを特徴とする請求の範囲6または請求の範囲7に記載のカバーガラスの積層構造。 - 光が入射する側の最も外側に、外界からの汚れを防止するための防汚コート膜をさらに備えることを特徴とする請求の範囲1から請求の範囲8のいずれか一の請求の範囲に記載のカバーガラスの積層構造。
- 前記撮像装置は、情報通信機器であり、
前記カバーガラスは、情報通信機器の筐体に連続して設置されることを特徴とする、請求の範囲1から請求の範囲9に記載のカバーガラスの積層構造。 - 請求の範囲1から請求の範囲9に記載のカバーグラスの積層構造を有するカバーガラスを備えるカメラ構造であって、
前記カバーガラス側に配置される光学レンズ群と
前記カバーガラス及び前記光学レンズ群を介して入射した光を受光する撮像素子と、
を備え、
前記光学レンズ群から前記撮像素子までの光路間に近赤外領域の光をカットする近赤外光カットフィルタを配置しないことを特徴とするカメラ構造。 - 請求の範囲11に記載のカメラ構造を有することを特徴とする撮像装置。
- 撮像装置の内部機構を外界から保護するカバーガラスの積層構造であって、
光を透過する透明基板と、
近赤外領域の光を反射する近赤外光反射膜と、
を備えることを特徴とするカバーガラスの積層構造。 - 紫外領域の光を反射し、且つ、少なくとも可視領域の光の反射を防止する反射防止膜をさらに備えることを特徴とする請求の範囲13に記載のカバーガラスの積層構造。
- 請求の範囲13または請求の範囲14に記載のカバーグラスの積層構造を有するカバーガラスを備えるカメラ構造であって、
前記カバーガラス側に配置される光学レンズ群と、
前記カバーガラス及び前記光学レンズ群を介して入射した光を受光する撮像素子と、
前記光学レンズ群と前記撮像素子の間に配置され、光を透過する内側透明プレートと
を備えることを特徴とするカメラ構造。 - 前記内側透明プレートは、合成樹脂フィルムであることを特徴とする請求の範囲15に記載のカメラ構造。
- 前記内側透明プレートの厚みは、0.2mm以下であることを特徴とする請求の範囲15または請求の範囲16に記載のカメラ構造。
- 前記内側透明プレートは、少なくとも可視領域の光の反射を防止する反射防止層を備えることを特徴とする請求の範囲15から請求の範囲17のうちのいずれかに記載のカメラ構造。
- 前記内側透明プレートの両面に、少なくとも可視領域の光の反射を防止する反射防止層を備えることを特徴とする請求の範囲15から請求の範囲17のうちのいずれかに記載のカメラ構造。
- 前記反射防止層は、前記内側透明プレートの表面に形成される微細な突起からなる微細突起構造であることを特徴とする請求の範囲18または請求の範囲19に記載のカメラ構造。
- 前記反射防止層は、前記内側透明プレートの表面に形成される塗膜であることを特徴とする請求の範囲18または請求の範囲19に記載のカメラ構造。
- 前記内側透明プレートは、近赤外領域の光を吸収する近赤外光吸収部をさらに備えることを特徴とする請求の範囲15から請求の範囲21のうちのいずれかに記載のカメラ構造。
- 前記近赤外光吸収部は、有機色素を含むことを特徴とする請求の範囲22に記載のカメラ構造。
- 請求の範囲15から請求の範囲23に記載のカメラ構造を有することを特徴とする撮像装置。
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