Glass and optical elements

Abstract

The objective of this invention is to provide a low-density glass capable of forming a light-shielding portion with excellent light-shielding properties and a light-transmitting portion with excellent light transmission properties, and a low-density optical element having both a light-shielding portion with excellent light-shielding properties and a light-transmitting portion with excellent light transmission properties. In the oxide glass of this invention, P... 5+ The content of ions is 7-43% cations, the content of Nb ions is 10-21% cations, and the content of Li ions is 7-43% cations. + The content is 20% or more of cations, Nb ions and Li + The total content is 48-70% cations, the Bi ion content is greater than 0% cations and less than 6% cations, and the Ba ion content is less than 6% cations. 2+ The content of Zr is less than 5% cations. 4+ The content of ions is less than 2% cations, the total content of Ti ions and W ions is less than 5% cations, and the Li content relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

Description

Technical Field

[0001] This invention relates to glass and optical components. Background Technology

[0002] In recent years, camera modules with built-in CCD, CMOS and other camera elements have been used in mobile phones, mobile information terminal devices and other devices.

[0003] In an imaging sensor, a cover glass with a light-shielding frame is disposed in front of the light-receiving part. This cover glass has a light-transmitting part (transparent part) that allows light directly incident on the light-receiving part of the imaging sensor to pass through. The light-shielding frame is formed to surround the light-transmitting part of the cover glass and serves to block stray light and other light indirectly incident on the light-receiving part. The light-shielding frame is usually formed separately on the surface of the cover glass from a different material than the light-transmitting part.

[0004] Here, Patent Document 1 discloses a glass having a light-blocking colored layer and a light-transmitting portion. According to the glass in Patent Document 1, the light-blocking colored layer can function as a light-blocking frame (light-blocking portion). In this way, it is possible to manufacture a cover glass that integrally possesses both a light-blocking portion and a light-transmitting portion on a single piece of glass.

[0005] In order to manufacture a cover glass using the glass of Patent Document 1, it is required that the transmittance of visible light, i.e., light in the wavelength range of 380 to 1100 nm, is higher in the light-transmitting part and lower in the light-shielding part.

[0006] Furthermore, in industry, cover glass is typically produced by dividing large glass sheets into multiple pieces. If the weight of the glass sheets increases, the glass becomes more prone to breakage and warping during production. Therefore, lightweight glass sheets are required in the production of cover glass.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: International Publication No. 2020 / 230649 Summary of the Invention

[0010] The problem the invention aims to solve

[0011] The present invention was made in view of the actual situation, and its object is to provide a low-density glass capable of forming a light-shielding part with excellent light-shielding properties and a light-transmitting part with excellent light transmission properties, and an optical element having a low-density light-shielding part with excellent light-shielding properties and a light-transmitting part with excellent light transmission properties.

[0012] Problem Solving Methods

[0013] The main points of this invention are as follows.

[0014] (1) An oxide glass, wherein,

[0015] P 5+ The content is 7-43% cationic.

[0016] The Nb ion content is 10-21% cations.

[0017] Li + The content is 20% or more cationic.

[0018] Nb ions and Li + The total content is 48-70% cationic.

[0019] The content of Bi ions is greater than 0 cations and less than 6 cations.

[0020] Ba 2+ The content is less than 5% cationic.

[0021] Zr 4+ The content is less than 2% cationic.

[0022] The total content of Ti and W ions is less than 5% cations.

[0023] Li content relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

[0024] (2) An optical element comprising the glass described in (1) above.

[0025] (3) An optical element integrally comprising a light-transmitting portion and a light-shielding portion having a visible light transmittance lower than that of the light-transmitting portion.

[0026] The optical element comprises oxide glass containing P 5+ Nb ions, Bi ions and Li ions + As a component of glass

[0027] The aforementioned oxide glass satisfies one or more of the following conditions (i) and (ii):

[0028] (i) Nb ions and Li + The total content is over 50% cationic.

[0029] (ii) Li content relative to Li + Na+ and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

[0030] (4) An optical element comprising glass with a specific gravity of 3.5 or less,

[0031] This optical element integrally comprises a light-transmitting portion with an internal transmittance of 96% or more at a wavelength of 380 nm when converted to a thickness of 1.0 mm, and a light-shielding portion with an optical density OD of 0.5 or more at a wavelength of 1100 nm.

[0032] The glass composition of the light-transmitting part and the light-shielding part is the same.

[0033] (5) The optical element according to any one of (2) to (4) is a cover glass.

[0034] The effects of the invention

[0035] According to the present invention, a low-density glass capable of forming a light-shielding portion having excellent light-shielding properties and a light-transmitting portion having excellent light transmittance can be provided, as well as an optical element having a low-density light-shielding portion having excellent light-shielding properties and a light-transmitting portion having excellent light transmittance. Attached Figure Description

[0036] Figure 1 This is a schematic diagram illustrating an example of an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram illustrating an example of an embodiment of the present invention. Detailed Implementation

[0038] Hereinafter, the present invention will be described in three embodiments: the first embodiment, the second embodiment, and the third embodiment. In the first to third embodiments, the present invention will be described based on the glass composition expressed as cation % (%). Therefore, unless otherwise specified, "%" in the content of glass components and the total content represents "cation %" (%).

[0039] The term "cation %" refers to the molar percentage when the sum of the contents of all cationic components is set to 100%. Additionally, "total content" refers to the total content of all cationic components (including cases where the content is 0%). Furthermore, "cation ratio" refers to the proportion (ratio) of the contents of each cationic component expressed as a cation % relative to the other (including the total content of all cationic components).

[0040] It should be noted that the percentage of anions refers to the molar percentage when the total content of all anionic components is set to 100%.

[0041] The valence of the cationic component (e.g., B) 3+ The valence is +3, Si 4+ The price is +4, La 3+ The valence of cations (+3) is a value determined by convention. When B, Si, and La, which are glass components, are expressed as oxides, it is the same as expressing them as B₂O₃, SiO₂, and La₂O₃. Therefore, when analyzing the glass composition, it is not necessary to analyze the valence of cations. Furthermore, the valence of anions (e.g., O) is also considered. 2- The valence of -2 is also a value determined by convention, similar to how the glass composition based on oxides is expressed as, for example, B2O3, SiO2, La2O3, as described above. Therefore, when analyzing the glass composition, it is not necessary to analyze the valence of the anionic components.

[0042] The content of the glass components can be quantified using known methods, such as inductively coupled plasma atomic emission spectrometry (ICP-AES) and inductively coupled plasma mass spectrometry (ICP-MS). Furthermore, in this specification and the present invention, a content of 0% for a constituent component means that the component is substantially absent, but its presence at an unavoidable impurity level is permissible.

[0043] In addition, unless otherwise specified, the refractive index in this specification refers to the refractive index nd at the d line (wavelength 587.56 nm) of yellow helium.

[0044] The Abbe number νd is used as a value to represent properties related to dispersion, as shown in the following formula. Here, nF is the refractive index of blue hydrogen at the F line (wavelength 486.13 nm), and nC is the refractive index of red hydrogen at the C line (656.27 nm).

[0045] νd=(nd-1) / (nF-nC)

[0046] Implementation Method 1

[0047] In the oxide glass of the first embodiment,

[0048] P 5+ The content is 7-43%.

[0049] The Nb ion content is 10-21%.

[0050] Li + The content is over 20%.

[0051] Nb ions and Li +The total content is 48-70%.

[0052] The content of Bi ions is greater than 0% and less than 6%.

[0053] Ba 2+ The content is less than 5%.

[0054] Zr 4+ The content is less than 2%.

[0055] The total content of Ti and W ions is less than 5%.

[0056] Li content relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

[0057] The glass in the first embodiment is an oxide glass, mainly formed of oxides. In this invention, oxide glass refers to glass containing O... 2- As an anionic component, and O 2- Glass with an anion content of 80% or more.

[0058] That is, the oxide glass of the first embodiment contains O 2- As an anionic component. Specifically, in the oxide glass of the first embodiment, O... 2- The lower limit of the content is preferably 90% anion, and more preferably in the order of 95% anion, 97% anion, and 98% anion. Additionally, O 2- The upper limit of the content is preferably 100% anion, and more preferably 99.5% anion, 99% anion, etc. 2- The content can also be 100% anion.

[0059] In the oxide glass of the first embodiment, F - The lower limit of the content is preferably 0% anion, and more preferably in the order of 0.1% anion, 0.2% anion, and 0.3% anion. F - The content can also be 0% anion. Additionally, F - The upper limit of the content is preferably 5.0% anion, and more preferably in the order of 3.0% anion, 1.0% anion, and 0.5% anion.

[0060] For the oxide glass of the first embodiment, F may also be contained as an anionic component. - and O 2-Other components. As F - and O 2- Other anionic components, such as Cl, can be cited as examples. - ,Br - I - But Cl - ,Br - I - All of these components readily volatilize during glass melting. This volatilization can lead to changes in glass properties, reduced glass homogeneity, and significant wear and tear on melting equipment. Therefore, the Cl- content is preferably below 5.0% anion, more preferably in the order of below 3.0% anion, below 1.0% anion, below 0.5% anion, and below 0.3% anion. Additionally, Br... - and I - The total content is preferably less than 5.0% anion, and more preferably in the order of less than 3.0% anion, less than 1.0% anion, less than 0.5% anion, less than 0.1% anion, and 0% anion.

[0061] In the oxide glass of the first embodiment, P 5+ The content is 7-43%. 5+ The lower limit of the content is preferably 10%, and more preferably in the order of 15%, 22%, and 27%. Additionally, P... 5+ The upper limit of the content is preferably 40%, and more preferably in the order of 37%, 34%, and 32%.

[0062] P 5+ This is a network-forming component for glass. By making P... 5+ When the content is within the above range, a light-shielding portion with excellent visible light shielding properties and a light-transmitting portion with excellent transmittance can be formed, further resulting in glass with a low specific gravity. On the other hand, P 5+ Excessive content of certain substances can lead to decreased chemical durability and reduced meltability.

[0063] In the oxide glass of the first embodiment, the Nb ion content is 10-21%. The lower limit of the Nb ion content is preferably 11%, and more preferably in the order of 12%, 14%, and 16%. Furthermore, the upper limit of the Nb ion content is preferably 20%, and more preferably in the order of 19.5%, 19%, and 18%. Regarding Nb ions, besides Nb... 5+ In addition, it can also contain Nb ions with different valences.

[0064] Nitrogen ions contribute to higher refractive index and are a component that enhances the coloration of glass. Additionally, they improve the thermal stability and chemical durability of glass. By maintaining the Nb ion content within the aforementioned range, glass capable of forming both a light-shielding section with excellent visible light blocking properties and a light-transmitting section with excellent transmittance can be obtained. On the other hand, excessive Nb ion content may lead to a decrease in the glass's resistance to devitrification and a decrease in the transmittance of the light-transmitting section to light in the short wavelength range (300–450 nm).

[0065] In the oxide glass of the first embodiment, Li + The content is over 20%. Li + The lower limit of the content is preferably 25%, and more preferably in the order of 30%, 35%, and 40%. Additionally, Li... + The upper limit of the content is preferably 60%, and more preferably in the order of 55%, 50%, and 47%.

[0066] By making Li + When the content of Li is within the above range, a light-shielding portion with excellent visible light blocking properties and a light-transmitting portion with excellent transmittance can be formed, further resulting in a glass with a low specific gravity. Furthermore, chemical strengthening of the glass becomes easier. On the other hand, Li... + Excessive content of certain substances can lead to a decrease in the thermal stability of the glass.

[0067] In the oxide glass of the first embodiment, Nb ions and Li + The total content is 48% to 70%. The lower limit of this total content is preferably 50%, and more preferably in the order of 52%, 54%, and 57%. In addition, the upper limit of this total content is preferably 75%, and more preferably in the order of 70%, 66%, and 63%.

[0068] By making Nb ions and Li + When the total content is within the above range, a light-shielding section with excellent light-shielding properties and a light-transmitting section with excellent light transmission properties can be formed, further resulting in glass with a low specific gravity. On the other hand, if the total content is too low, there is a risk of reduced light-shielding properties in the light-shielding section.

[0069] In the oxide glass of the first embodiment, the content of Bi ions is greater than 0% and less than 6%. The lower limit of the Bi ion content is preferably 0.2%, and more preferably in the order of 0.3%, 0.4%, and 0.5%. Furthermore, the upper limit of the Bi ion content is preferably 5%, and more preferably in the order of 4%, 2%, and 1%. Regarding Bi ions, besides Bi... 3+ In addition, it can also contain Bi ions with different valences.

[0070] Bi ions contribute to higher refractive index and enhance the coloration of the glass. By maintaining the Bi ion content within the aforementioned range, glass capable of forming both a light-shielding section with excellent visible light shielding and a light-transmitting section with excellent transmittance can be obtained. On the other hand, excessive Bi ion content may lead to decreased transmittance of the light-transmitting section to short wavelengths (300–450 nm). Conversely, insufficient Bi ion content may result in reduced light shielding performance of the light-shielding section.

[0071] In the oxide glass of the first embodiment, Ba 2+ The content is less than 5%. Ba 2+ The upper limit of the content is preferably 4%, and more preferably in the order of 3%, 2%, and 1%. Additionally, Ba... 2+ The lower limit of the content of Ba is preferably 0%. 2+ The content can also be 0%.

[0072] Ba 2+ It has the effect of improving the thermal stability and melting properties of glass. This is achieved by making Ba... 2+ When the content of Ba is within the above range, glass with a low specific gravity can be obtained. On the other hand, Ba... 2+ Excessive content of certain substances can lead to an increased specific gravity and decreased resistance to devitrification. Furthermore, it can reduce the thermal stability of the glass.

[0073] In the oxide glass of the first embodiment, Zr 4+ The content of Zr is less than 2%. 4+ The upper limit of the content of Zr is preferably 1.5%, and more preferably in the order of 1% and 0.5%. Additionally, Zr... 4+ The lower limit of Zr content is preferably 0%. 4+ The content can also be 0%.

[0074] Zr 4+ It has the effect of improving the thermal stability of glass. This is achieved by using Zr... 4+ When the content of Zr is within the above range, a light-shielding portion with excellent visible light shielding properties and a light-transmitting portion with excellent transmittance can be formed, further resulting in a glass with a low specific gravity. On the other hand, Zr 4+ When the content of [a certain substance] is too high, there is a tendency for the thermal stability and melting properties of the glass to decrease.

[0075] In the oxide glass of the first embodiment, the total content of Ti ions and W ions is 5% or less. The upper limit of this total content is preferably 4%, and more preferably in the order of 3%, 2%, and 1%. Furthermore, the lower limit of this total content is preferably 0%. The total content may also be 0%.

[0076] By ensuring the total content of Ti and W ions is within the aforementioned range, glass capable of forming a light-shielding section with excellent visible light shielding properties and a light-transmitting section with excellent transmittance can be obtained. On the other hand, if the total content is too high, there is a risk that the transmittance of the light-transmitting section for light in the short wavelength range (wavelength 300–450 nm) will decrease.

[0077] In the oxide glass of the first embodiment, the Li content is relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The cation ratio is 0.5 or higher. The lower limit of this cation ratio is preferably 0.7, and more preferably in the order of 0.8, 0.9, and 1. The cation ratio may also be 1.

[0078] By adjusting the cation ratio [Li] + / (Li + +Na + +K + Within the aforementioned range, a light-shielding portion with excellent light-shielding properties and a light-transmitting portion with excellent light transmission properties can be formed, resulting in a glass with a low specific gravity. On the other hand, if the cation ratio is too small, there is a risk that the light-shielding properties of the light-shielding portion may decrease.

[0079] Hereinafter, non-limiting examples are shown regarding the content and ratio of glass components other than those described above in the oxide glass of the first embodiment.

[0080] In the oxide glass of the first embodiment, B 3+ The upper limit of its content is preferably 20%, and more preferably in the order of 15%, 10%, and 8%. Additionally, B... 3+ The lower limit of its content is preferably 1%, and more preferably in the order of 3%, 5%, and 6%. 3+ The content can also be 0%.

[0081] B 3+ As a network-forming component of glass, it improves the meltability of glass. On the other hand, B 3+ Excessive amounts of [a substance] tend to reduce chemical durability. Therefore, B 3+ The content of [specific component] is preferably within the range described above.

[0082] In the oxide glass of the first embodiment, B 3+ The content relative to P 5+ The content of cation ratio [B] 3+ / P 5+The upper limit of [B] is preferably 0.5, and more preferably in the order of 0.45, 0.4, and 0.35. Additionally, the cation ratio [B] 3+ / P 5+ The lower limit of ] is preferably 0. The cation ratio [B] 3+ / P 5+ It can also be 0.

[0083] In the oxide glass of the first embodiment, Si 4+ The upper limit of the content is preferably 10%, and more preferably in the order of 7%, 5%, 3%, 2%, and 1%. Additionally, Si... 4+ The lower limit of the Si content is preferably 0.1%, and more preferably in the order of 0.2%, 0.3%, 0.4%, and 0.5%. 4+ The content can also be 0%.

[0084] Si 4+ As a network-forming component of glass, Si improves the glass's thermal stability, chemical durability, and weather resistance. On the other hand, Si... 4+ When the Si content is too high, the glass's meltability decreases, and there is a tendency for molten residue to remain in the glass raw materials. Therefore, Si 4+ The content of [specific component] is preferably within the range described above.

[0085] In the oxide glass of the first embodiment, Al 3+ The upper limit of the content is preferably 10%, and more preferably in the order of 7%, 5%, 3%, and 1%. Additionally, Al... 3+ The lower limit of the content of Al is preferably 0%. 3+ The content can also be 0%.

[0086] Al 3+ It improves the chemical durability and weather resistance of glass. On the other hand, Al... 3+ Excessive Al content can easily lead to decreased thermal stability, increased glass transition temperature (Tg), and decreased meltability in glass. Therefore, Al... 3+ The content of [specific component] is preferably within the range described above.

[0087] In the oxide glass of the first embodiment, P 5+ B 3+ Si 4+ and Al 3+ Total content [P] 5+ +B 3+ +Si 4+ +Al 3+ The lower limit of [P] is preferably 29%, and more preferably in the order of 31%, 33%, and 34%. Additionally, the total content [P] 5+ +B 3+ +Si4+ +Al 3+ The upper limit of ] is preferably 50%, and more preferably in the order of 44%, 41%, and 38%.

[0088] In the oxide glass of the first embodiment, it is preferable to have a low content of Ti ions, with an upper limit of 2.0%, and more preferably a lower content in the order of 1.5%, 1.0%, and 0.5%. The content of Ti ions can also be 0%. Here, for Ti ions, besides Ti... 4+ Ti 3+ In addition, it can also contain Ti ions with different valences.

[0089] Like Nb, W, and Bi ions, Ti ions greatly contribute to increasing the refractive index and enhance the coloration of the glass. However, excessive Ti ion content may lead to decreased transmittance of the light-transmitting portion in the short wavelength range (300–450 nm). Furthermore, it may reduce the glass's meltability and cause molten residue in the glass raw materials. Therefore, the preferred Ti ion content is within the range described above.

[0090] In the oxide glass of the first embodiment, it is preferable to have a low content of W ions, with an upper limit of 1.5%, and even more preferably a lower content in the order of 1.0% and 0.5%. The content of W ions can also be 0%. Regarding W ions, besides W... 6+ In addition, it can also contain W ions with different valences.

[0091] W ions contribute to higher refractive index and enhance the coloration of the glass. However, excessive W ion content may lead to decreased transmittance of the light-transmitting portion in the short wavelength range (300–450 nm). Therefore, the preferred W ion content is within the aforementioned range.

[0092] In the oxide glass of the first embodiment, the lower limit of the total content of Ti ions, Nb ions, and W ions [Ti+Nb+W] is preferably 10%, and more preferably in the order of 11%, 12%, 14%, and 16%. Furthermore, the upper limit of the total content [Ti+Nb+W] is preferably 21%, and more preferably in the order of 20%, 19.5%, 19%, and 18%.

[0093] In the glass of the first embodiment, the lower limit of the total content of Ti ions, Nb ions, W ions, and Bi ions [Ti+Nb+W+Bi] is preferably 11%, and more preferably in the order of 12%, 14%, and 16%. Furthermore, the upper limit of the total content [Ti+Nb+W+Bi] is preferably 21.5%, and more preferably in the order of 20.5%, 20%, and 19%.

[0094] In the oxide glass of the first embodiment, the total content of Ti ions, Nb ions, W ions, and Bi ions relative to P 5+ B 3+ and Si 4+ The total content of cation ratio [(Ti+Nb+W+Bi) / (P] 5+ +B 3+ +Si 4+ The lower limit of [(Ti+Nb+W+Bi) / (P]] is preferably 0.36, and more preferably in the order of 0.38, 0.4, and 0.42. Additionally, the cation ratio [(Ti+Nb+W+Bi) / (P] is […]. 5+ +B 3+ +Si 4+ The upper limit of )] is preferably 0.8, and even more preferably in the order of 0.75, 0.7, and 0.64.

[0095] In the oxide glass of the first embodiment, Ta 5+ The upper limit of its content is preferably 5%, and more preferably in the order of 3%, 2%, and 1%. Additionally, Ta... 5+ The lower limit of its content is preferably 0%. 5+ The content can also be 0%.

[0096] Ta 5+ It has the effect of improving the thermal stability of glass. On the other hand, Ta 5+ When the content of Ta is too high, the glass tends to have a low refractive index and reduced meltability. Therefore, Ta 5+ The content of [specific component] is preferably within the range described above.

[0097] In the oxide glass of the first embodiment, Na + The upper limit of the content is preferably 7%, and more preferably in the order of 5%, 3%, and 1%. Additionally, Na... + The lower limit of the Na content is preferably 0%. + The content can also be 0%.

[0098] By making the glass contain Na + Chemical strengthening of glass becomes easier. On the other hand, Na... + Excessive sodium content can lead to a decrease in the thermal stability of the glass. + When the content of Li increases, in order to maintain the thermal stability of the glass, it is necessary to make Li... + The reduced content of Na results in the potential inability to form both a light-blocking portion with excellent visible light-blocking properties and a light-transmitting portion with excellent light-transmitting properties. Therefore, Na... + The content of [specific component] is preferably within the range described above.

[0099] In the oxide glass of the first embodiment, Li +And Na + Total content [Li + +Na + The upper limit of [Li] is preferably 60%, and more preferably in the order of 55%, 50%, and 47%. Additionally, the total content [Li] + +Na + The lower limit is preferably 20%, and more preferably in the order of 25%, 30%, 35%, and 40%.

[0100] In the oxide glass of the first embodiment, K + The upper limit of the content is preferably 7%, and more preferably in the order of 5%, 3%, and 1%. Additionally, K + The lower limit of its content is preferably 0%. K + The content can also be 0%.

[0101] K + It has the effect of improving the thermal stability of glass. On the other hand, K + Excessive K content can lead to decreased thermal stability. + When the content of Li increases, in order to maintain the thermal stability of the glass, it is necessary to make Li... + The reduced content of K results in the potential inability to form both a light-blocking portion with excellent visible light shielding properties and a light-transmitting portion with excellent light transmittance. Therefore, K + The content of [specific component] is preferably within the range described above.

[0102] In the oxide glass of the first embodiment, Rb + The upper limit of the content is preferably 5%, and more preferably in the order of 3%, 1%, and 0.5%. Additionally, Rb... + The lower limit of its content is preferably 0%. Rb + The content can also be 0%.

[0103] In the oxide glass of the first embodiment, Cs + The upper limit of the content of Cs is preferably 5%, and more preferably in the order of 3%, 1%, and 0.5%. Additionally, Cs + The lower limit of the content of Cs is preferably 0%. + The content can also be 0%.

[0104] Rb + and Cs + They improve the meltability of glass. On the other hand, excessive amounts of these substances can lead to a decrease in the refractive index (nd) and an increase in the volatilization of glass components during melting. Therefore, Rb + and Cs + The content of each is preferably within the ranges mentioned above.

[0105] In the oxide glass of the first embodiment, Mg 2+ The upper limit of the content is preferably 15%, and more preferably in the order of 10%, 5%, 3%, and 1%. Additionally, Mg... 2+ The lower limit of Mg content is preferably 0%. 2+ The content can also be 0%.

[0106] In the oxide glass of the first embodiment, Ca 2+ The upper limit of the content is preferably 15%, and more preferably in the order of 10%, 5%, 3%, and 1%. Additionally, Ca... 2+ The lower limit of the content of Ca is preferably 0%. 2+ The content can also be 0%.

[0107] In the oxide glass of the first embodiment, Sr 2+ The upper limit of the content is preferably 15%, and more preferably in the order of 10%, 5%, 3%, and 1%. Additionally, Sr... 2+ The lower limit of the content of Sr is preferably 0%. 2+ The content can also be 0%.

[0108] Mg 2+ Ca 2+ and Sr 2+ All of these components improve the thermal stability and melt flow properties of glass. However, excessive amounts of these components can impair the high refractive index and reduce the thermal stability of the glass. Therefore, the contents of each of these glass components are preferably within the ranges described above.

[0109] In the oxide glass of the first embodiment, Mg 2+ Ca 2+ 、Sr 2+ And Ba 2+ Total content [Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ The upper limit of the total content is preferably 30%, and more preferably in the order of 25%, 20%, 18%, 15%, 10%, and 5%. Furthermore, the lower limit of the total content is preferably 0%. The total content may also be 0%.

[0110] In the oxide glass of the first embodiment, Zn 2+ The upper limit of the content is preferably 8%, and more preferably in the order of 6%, 4%, and 2%. Additionally, Zn is preferred. 2+ When the content is low, the lower limit is preferably 1%, and more preferably in the order of 0.8%, 0.6%, 0.4%, and 0%. Zn 2+ The content can also be 0%.

[0111] Zn 2+ It has the effect of improving the thermal stability of glass. On the other hand, Zn 2+ Excessive Zn content poses a risk of decreased meltability. 2+ The content of [specific component] is preferably within the range described above.

[0112] In the oxide glass of the first embodiment, Ga 3+ The upper limit of the content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Ga... 3+ The lower limit of the content of Ga is preferably 0%. 3+ The content can also be 0%.

[0113] In the oxide glass of the first embodiment, In 3+ The upper limit of its content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, In 3+ The lower limit of its content is preferably 0%. 3+ The content can also be 0%.

[0114] In the oxide glass of the first embodiment, Sc 3+ The upper limit of the content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Sc 3+ The lower limit of the content of Sc is preferably 0%. 3+ The content can also be 0%.

[0115] In the oxide glass of the first embodiment, Hf 4+ The upper limit of the content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Hf 4+ The lower limit of Hf content is preferably 0%. 4+ The content can also be 0%.

[0116] In the oxide glass of the first embodiment, Lu 3+ The upper limit of the content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Lu... 3+ The lower limit of its content is preferably 0%. 3+ The content can also be 0%.

[0117] In the oxide glass of the first embodiment, Ge 4+ The upper limit of the content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Ge 4+ The lower limit of the content of [Ge] is preferably 0%. 4+ The content can also be 0%.

[0118] In the oxide glass of the first embodiment, La3+ The upper limit of the content is preferably 5%, and more preferably in the order of 4% and 3%. Additionally, La... 3+ The lower limit of the content of La is preferably 0%. 3+ The content can also be 0%.

[0119] In the oxide glass of the first embodiment, Gd 3+ The upper limit of the content is preferably 5%, and more preferably in the order of 4% and 3%. Additionally, Gd... 3+ The lower limit of the content of Gd is preferably 0%. 3+ The content can also be 0%.

[0120] In the oxide glass of the first embodiment, Y 3+ The upper limit of the content of Y is preferably 5%, and more preferably in the order of 4% and 3%. Additionally, Y 3+ The lower limit of the content of Y is preferably 0%. 3+ The content can also be 0%.

[0121] In the oxide glass of the first embodiment, Yb 3+ The upper limit of its content is preferably 3%, and more preferably in the order of 2% and 1%. Additionally, Yb 3+ The lower limit of the content of Yb is preferably 0%. 3+ The content can also be 0%.

[0122] The cationic composition of the oxide glass in the first embodiment preferably consists mainly of the above-mentioned components, i.e., P, which is an essential component. 5+ Nb ions, Li + Bi ions, Ba as any component 2+ Zr 4+ B 3+ Si 4+ Al 3+ Ti ions, W ions, Ta 5+ Na + K + 、Rb + Cs + Mg 2+ Ca 2+ 、Sr 2+ Zn 2+ Ga 3+ In 3+ ,Sc 3+ Hf 4+ Lu 3+ 、Ge 4+ La 3+ Gd 3+ Y 3+ and Yb3+ The composition of the above-mentioned components is preferably more than 95%, more preferably more than 98%, further preferably more than 99%, and even more preferably 99.5%.

[0123] The oxide glass in this embodiment is preferably composed of the above-described components, but may also contain other components within a range that does not impair the effectiveness of the present invention.

[0124] For example, in the oxide glass of this embodiment, to further impart near-infrared light absorption properties to the glass, an appropriate amount of copper (Cu) may be included as a glass component. In addition, it may also contain V, Cr, Mn, Fe, Co, Ni, Pr, Nd, Pm, Sm, Eu, Tb, Dy, Ho, Er, Tm, Ce, etc. These components can increase the coloration of the glass, making it a source of fluorescence.

[0125] Furthermore, the presence of unavoidable impurities is not excluded in this invention.

[0126] <Other components>

[0127] Pb, As, Cd, Tl, Be, and Se are all toxic. Therefore, the oxide glass of this embodiment preferably does not contain these elements as glass components.

[0128] U, Th, and Ra are all radioactive elements. Therefore, the oxide glass of this embodiment preferably does not contain these elements as glass components.

[0129] Sb 3+ Sn 4+ and Ce 4+ It functions as a clarifying agent and is an optional glass component. Among them, Sb... 3+ It is a clarifying agent with a significant clarifying effect.

[0130] Sb 3+ The content of Sb is converted to Sb₂O₃ and expressed as an external percentage by mass (%). Here, external percentage means that the content of Sb is expressed as an external percentage by mass (%). 3+ Sn 4+ and Ce 4+ The content ratio of the cations other than Sb₂O₃ is converted to oxides in the same way, and Sb 3+ Sn 4+ and Ce 4+When the sum of the contents of all other cationic components is set to 100% by mass, the content of Sb₂O₃ is expressed as % by mass. The content of Sb₂O₃ is preferably less than 2% by mass, more preferably less than 1% by mass, further preferably less than 0.5% by mass, even more preferably less than 0.2% by mass, less than 0.1% by mass, and less than 0.05% by mass. By setting the content of Sb₂O₃ within the above range, the clarity of the glass can be improved.

[0131] Sn 4+ and Ce 4+ The content of each is also converted to oxides and expressed as an external proportion. That is, Sb 3+ Sn 4+ and Ce 4 + The content ratio of cations other than Sb is converted into oxides, and Sb is used to convert the content ratio of Sb into oxides. 3+ Sn 4+ and Ce 4+ When the sum of the contents of all cationic components other than SnO2 is set to 100% by mass, the content of SnO2 and CeO2 is expressed as mass%. The contents of SnO2 and CeO2 are preferably less than 2% by mass, more preferably less than 1% by mass, further preferably less than 0.5% by mass, and even more preferably less than 0.1% by mass, respectively. The contents of SnO2 and CeO2 can also be 0% by mass. By keeping the contents of SnO2 and CeO2 within the above ranges, the clarity of the glass can be improved.

[0132] <Glass Properties>

[0133] (Refractive index nd)

[0134] In the oxide glass of the first embodiment, the lower limit of the refractive index nd is preferably 1.68, but may also be 1.70, 1.72, or 1.73. The upper limit of the refractive index nd is not particularly limited, but is usually 1.78, and preferably 1.76.

[0135] (Abbe number νd)

[0136] In the oxide glass of the first embodiment, the lower limit of the Abbe number νd is preferably 24, but may also be 25, 26, 28, or 29. The upper limit of the Abbe number νd is not particularly limited, but is usually 35, and preferably 32.

[0137] (Glass transition temperature Tg)

[0138] In the oxide glass of the first embodiment, the upper limit of the glass transition temperature Tg is preferably 530°C, and more preferably in the order of 500°C, 480°C, and 460°C. Furthermore, the lower limit of the glass transition temperature Tg is not particularly limited, and is generally 400°C, preferably 440°C.

[0139] (Yield temperature Ts)

[0140] In the oxide glass of the first embodiment, the upper limit of the yield temperature Ts is preferably 600°C, and more preferably in the order of 570°C, 550°C, and 530°C. Furthermore, the lower limit of the yield temperature Ts is not particularly limited, and is generally 400°C, preferably 460°C.

[0141] (proportion)

[0142] In the oxide glass of the first embodiment, the specific gravity is preferably 3.5 or less, and more preferably in the order of 3.4 or less, 3.3 or less, and 3.2 or less.

[0143] (Internal transmittance)

[0144] In the oxide glass of the first embodiment, the internal transmittance at a wavelength of 380 nm, when converted to a thickness of 1.0 mm, is preferably 96% or more, and more preferably in the order of 96.5% or more, 97% or more, and 98% or more. Furthermore, the minimum internal transmittance of light in the wavelength range of 380 to 1100 nm, when converted to a thickness of 1.0 mm, is preferably 97% or more, and more preferably in the order of 98% or more, 99% or more, and 99.5% or more.

[0145] In this embodiment, glass samples with thicknesses of 2.0 mm ± 0.1 mm and 10.0 mm ± 0.1 mm are used. The spectral transmittance is measured according to JOGIS 17 (method for measuring the internal transmittance of optical glass), and the value obtained by converting it to a thickness of 1.0 mm is taken as the internal transmittance.

[0146] <Glass Manufacturing>

[0147] The oxide glass of the first embodiment can be manufactured using known glass manufacturing methods. For example, various compounds are mixed thoroughly to form a batch of raw materials, which are then added to a melting vessel for melting, clarification, and homogenization. The molten glass is then shaped and slowly cooled to obtain glass. Alternatively, the batch of raw materials can be added to a melting vessel for rough melting (rough melting), and the resulting melt is quenched and pulverized to produce glass shards. These shards are then added to a melting vessel for heating and remelting (remelting) to produce molten glass. This molten glass is then clarified and homogenized, and finally shaped and slowly cooled to obtain glass. The shaping and slow cooling of the molten glass can be performed using known methods.

[0148] Furthermore, the glass manufacturing process of this embodiment may also include a step to increase the moisture content in the molten glass. Examples of steps to increase the moisture content in the molten glass include applying water vapor to a molten atmosphere and bubbling a gas containing water vapor into the melt. The step of applying water vapor to a molten atmosphere is preferred. By including a step to increase the moisture content in the molten glass, the βOH value of the glass can be increased. By increasing the βOH value, glass with higher transparency can be obtained.

[0149] The light-shielding part can be formed in the manufactured glass using the methods described later.

[0150] The oxide glass of this embodiment can be used as an optical element. From the viewpoint of using it as an optical element, the oxide glass of this embodiment is preferably optical glass. It should be noted that the oxide glass of this embodiment is not limited to optical glass because it can be effectively used as decorative items, external decorations for small electronic devices, etc., by utilizing the decorative properties of the light-shielding part.

[0151] <Manufacturing of optical components, etc.>

[0152] The optical element comprising the oxide glass of this embodiment can be manufactured using a known manufacturing method. For example, molten glass is poured into a mold and shaped into a plate to produce a glass material. The obtained glass material is appropriately cut, ground, and polished to produce slices of a size and shape suitable for pressure forming. The slices are heated and softened, and pressure formed (reheated and pressurized) using a known method to produce an optical element blank with a shape approximating that of an optical element. The optical element blank is annealed, and then ground and polished using a known method to produce the optical element.

[0153] The light-shielding part is formed in the fabricated optical element using the method described later. Alternatively, the light-shielding part can be formed during the fabrication of the optical element.

[0154] Anti-reflective coatings, total reflection coatings, etc., can also be applied to the optical functional surfaces of the manufactured optical components according to their intended use.

[0155] According to one aspect of the present invention, an optical element comprising the aforementioned oxide glass can be provided. Examples of optical elements include spherical lenses, aspherical lenses, prisms, etc. Examples of lens shapes include various shapes such as biconvex lenses, plano-convex lenses, biconcave lenses, plano-concave lenses, convex meniscus lenses, concave meniscus lenses, etc. The optical element can be manufactured by a method including a process of machining a glass molded body made of the aforementioned oxide glass. Examples of machining processes include cutting, shaving, rough grinding, fine grinding, polishing, etc.

[0156] Another example of an optical element is an optical element used to block light incident obliquely onto the light-receiving surface of an image sensor such as a CCD or CMOS sensor. Specifically, an example is a cover glass used to block light incident obliquely onto the light-receiving surface of an image sensor.

[0157] Furthermore, according to one aspect of the present invention, the decorative nature of the light-shielding portion, as described later, can also be effectively utilized for use as a decorative item, an exterior decoration for small electronic devices, etc.

[0158] <Formation of the light-blocking part>

[0159] In the oxide glass and optical element of the first embodiment, a light-shielding portion of any shape can be formed. The light-shielding portion refers to the part of the glass itself that is colored, preferably formed in a layered manner from the glass surface inwards. In this light-shielding portion, the transmittance of visible light is reduced by coloring. Furthermore, the portion where no light-shielding portion is formed, i.e., the uncolored portion, becomes the light-transmitting portion. That is, in the oxide glass and optical element of this embodiment, an uncolored light-transmitting portion and a light-shielding portion with a visible light transmittance lower than that of the light-transmitting portion can be integrally provided. As described later, such glass can be used as an optical element that functions as a cover glass.

[0160] The light-shielding part can be formed by a process of forming a metal film of any shape on the glass surface and a process of heat treatment in a reducing atmosphere.

[0161] The metal constituting the metal film is preferably a metal that adsorbs hydrogen ions in the atmosphere and then reduces the glass components contained in the glass through the acceptance and donation of hydrogen ions and electrons. Among the glass components, a metal that reduces transition metals is more preferred. Examples include alloys containing the aforementioned metals such as Ni, Au, Ag, Pt, Pd, and Pt-Pd alloys.

[0162] The light-shielding portion can be formed using a metal paste containing the metal constituting the metal film as described above. Furthermore, there are no particular limitations on the method of forming the metal film on the glass surface, as long as the metal film can adhere tightly to the glass surface; examples include: vapor deposition, sputtering, plating, screen printing, or coating.

[0163] A reducing atmosphere only needs to contain a gas with reducing power. Examples of reducing gases include hydrogen. Therefore, a hydrogen-containing gas is preferred as a reducing atmosphere, but a synthesis gas containing hydrogen can also be used. A synthesis gas is a mixture of hydrogen and nitrogen, typically containing about 3-5% by volume of hydrogen.

[0164] In heat treatment, heating is carried out at a temperature 200°C lower than the glass transition temperature (Tg) but below the softening point. The heat treatment time can be adjusted appropriately according to the target's coloring intensity, the extent of the light-blocking area, and the thickness of the light-blocking area.

[0165] After heat treatment, the metal film is peeled off the glass surface. There are no particular limitations on the peeling method; methods such as polishing and dissolving with acidic liquids can be listed.

[0166] A light-shielding section is formed from the glass surface in contact with the metal film to the interior through heat treatment in a reducing atmosphere.

[0167] The mechanism by which the light-shielding part is formed by the above method is not particularly limited, but the following can be considered.

[0168] The coloring of the light-shielding portion formed in this embodiment is considered to originate from the reduced color of the glass composition, and particularly from the reduced color of transition metals. Normally, even when the glass molded body is heat-treated in an atmosphere containing hydrogen at a low concentration of about 3-5% by volume, the glass hardly exhibits a reduced color. However, because the aforementioned metal film adsorbs hydrogen ions from the atmosphere, the portion of the glass in contact with the metal film receives a greater supply of hydrogen ions compared to the portion not in contact with the metal film, resulting in a rapid reduction reaction. Therefore, the portion of the glass in contact with the metal film is darker in color. Due to the large amount of hydrogen ion adsorption by the metal film, the hydrogen concentration in the atmosphere is even reduced due to the adsorption of the metal film. For this reason, the portion not in contact with the metal film is less likely to undergo a reduction reaction.

[0169] That is, the coloring of the light-shielding part is preferably a reduced color derived from the glass composition as described above, and more preferably a reduced color derived from a transition metal. Examples of transition metals include Ti, Nb, W, and Bi.

[0170] In the oxide glass and optical element of this embodiment, as described above, the light-shielding portion is the part of the glass itself that is colored; therefore, the glass composition of the light-transmitting portion and the light-shielding portion is the same. However, sometimes the valence of the glass components (cations) differs between the light-transmitting portion and the light-shielding portion. Furthermore, the phrase "same glass composition" in this invention means that the compositional analysis results are consistent within the error range.

[0171] Here, the reduction reaction of the glass components, which is the main cause of coloration, proceeds in all directions from the part in contact with the metal film. That is, when viewed from the cross-section of the glass, the light-blocking part is formed along the thickness direction from the glass surface in contact with the metal film, while when viewed from the surface of the glass, the light-blocking part is formed radially from the part in contact with the metal film.

[0172] By using the above method, a darker-colored light-shielding portion can be formed. Therefore, even with a small thickness of the light-shielding portion, the transmittance can be sufficiently reduced. When the thickness of the light-shielding portion is small, the range of the light-shielding portion that radiates from the portion in contact with the metal film, as observed from the glass surface, is also smaller. That is, according to this embodiment, by adjusting the formation conditions of the light-shielding portion, a light-shielding portion with a shape substantially the same as that of the metal film can be formed when viewed from the glass surface.

[0173] In the oxide glass and optical element of this embodiment, when converted to a thickness of 1.0 mm, the maximum external transmittance of the light-shielding part in visible light (light in the wavelength range of 380 to 1100 nm) is preferably 20% or less, and more preferably in the order of 15% or less, 8% or less, and 5% or less.

[0174] External transmittance is a percentage value representing the ratio (I / I0) of the intensity of transmitted light I through the glass to the intensity of incident light I0 incident on the glass; that is, it is transmittance that also takes into account surface reflection from the glass surface. External transmittance can be obtained by measuring the transmission spectrum using a spectrophotometer. In this embodiment, the value converted to a thickness of 1.0 mm is used as the external transmittance.

[0175] In the oxide glass and optical element of this embodiment, the optical density OD of the light-shielding part at a wavelength of 1100 nm is preferably 0.5 or more, and more preferably 0.8 or more, 1.0 or more, and 1.3 or more in that order.

[0176] Optical density OD is expressed as shown in the following formula. It is a value obtained by adding a negative sign (-) to the common logarithm of the ratio of incident light intensity I0 to transmitted light intensity I.

[0177] OD = -log 10 (I / I o )

[0178] In the oxide glass and optical element of the first embodiment, the OD of the light-shielding part is large, while the OD of the light-transmitting part is small. In the measurement of OD, when measuring light passing through both the light-shielding part and the light-transmitting part, since the OD of the light-transmitting part is sufficiently small, the OD of the light-shielding part becomes dominant.

[0179] Furthermore, in oxide glass and optical elements having two opposing sides, the OD is approximately twice that of the case where light-shielding portions with the same thickness and the same degree of coloring are provided on both sides.

[0180] Furthermore, in the oxide glass and optical element of this embodiment, the OD decreases with increasing wavelength across the wavelength range from the visible light region to the near-infrared region. Therefore, in the light-shielding portion, for example, the OD at a wavelength of 780 nm is greater than the OD at a wavelength of 1100 nm.

[0181] Therefore, when there is a wavelength range for which light blocking is desired, the design is carried out by increasing the OD (exposure potential) at the longer wavelengths within that range. When designing glass that only blocks visible light, it is sufficient to set the OD to be higher at the longer wavelengths in the visible light region (e.g., 780 nm). Furthermore, when designing glass that blocks light from the visible light region to the near-infrared region, it is sufficient to set the OD to be higher at the wavelengths in the near-infrared region (e.g., 1100 nm). The OD can be controlled by adjusting the thickness of the light-blocking portion, the degree of coloration of the light-blocking portion, etc.

[0182] In the oxide glass and optical element of this embodiment, one or more surfaces may have light-shielding portions that are entirely covered, or they may have light-shielding portions patterned into arbitrary shapes. When patterning is performed, the shapes may include, for example, patterns, text, numbers, graphics, designs, identification codes, etc., or shapes drawn with straight lines or curves. Through the above method, in the oxide glass and optical element of this embodiment, the contrast between the light-shielding portions and the uncolored light-transmitting portions is significant, and light-shielding portions patterned into arbitrary shapes can be formed.

[0183] The oxide glass and optical element of this embodiment can be plate-shaped and have light-shielding portions of arbitrary shape on one or both sides. Light-shielding portions can be present on the entire surface of one or both sides, or they can be patterned into arbitrary shapes. The thickness of the glass is not particularly limited, but when light-shielding portions are formed on both sides of the glass, if the glass thickness is small, the light-shielding portions formed on one side and on the other side may sometimes overlap in the thickness direction. In this case, the light-shielding portions may also be formed in a manner that extends through the thickness direction of the glass.

[0184] Furthermore, for thin glass, warping and other deformations can sometimes occur due to the formation of light-shielding portions. The cause is not particularly specific, but it can be considered as stress generated within the glass due to the formation of the light-shielding portion. While warping may occur if a light-shielding portion is placed on only one side of the glass, sometimes light-shielding portions can be placed on both sides to counteract the stress generated within the glass. The shape of the light-shielding portion is not particularly limited. Warping and deformation caused by the formation of light-shielding portions are more likely to occur when the glass thickness is less than 1 mm.

[0185] The oxide glass and optical element of this embodiment can be plate-shaped, having light-shielding portions on both a first and a second main surface, and formed such that the light-shielding portions on the first and second main surfaces do not overlap when viewed from above. By providing the light-shielding portions in this way, glass warping and deformation caused by the formation of the light-shielding portions can be reduced. For example, by... Figure 1 As shown, providing light-shielding parts at different positions on the first and second main surfaces can sometimes reduce the warping and deformation of the glass.

[0186] Alternatively, the oxide glass and optical element of this embodiment can also be plate-shaped, having light-shielding portions on both the first and second main surfaces, and formed such that part or all of the light-shielding portion on the first main surface overlaps with part or all of the light-shielding portion on the second main surface when viewed from above. This reduces glass warping and deformation. For example, it can be as follows: Figure 2 As shown, for a sheet of glass, light-shielding portions of the same shape are formed at the same position on the first and second main surfaces of the glass when viewed from above. In this case, even if the degree of coloring is low in each of the light-shielding portions formed on the first and second main surfaces, the light-shielding portions on the first and second main surfaces appear to be deeply colored because they are observed overlapping when viewed from above. With a low degree of coloring, the degree of warping and deformation is also small. Where a lower degree of coloring is preferable, the heat treatment time in the reducing atmosphere described above can be shortened. If the heat treatment time in the reducing atmosphere is shortened, the transmittance of the light-transmitting portion (uncolored portion) other than the light-shielding portion can be maintained at a high level. As a result, the contrast between the light-shielding portion and the light-transmitting portion becomes more significant when viewed from above.

[0187] The oxide glass and optical element in this embodiment can also be plate-shaped, with a light-transmitting portion (uncolored portion) in the center when viewed from above, and a light-shielding portion provided to surround the light-transmitting portion. Such glass can be used as an optical element that functions as a cover glass.

[0188] Cover glass refers to an optical element disposed in front of a solid-state camera element, as disclosed in patent document (Japanese Patent Application Publication No. 2015-179788). In particular, it can be mounted in front of a package housing the solid-state camera element, serving as a light-transmitting window while protecting the solid-state camera element. In recent years, camera modules incorporating solid-state camera elements such as CCDs and CMOS sensors have been used in mobile phones, mobile information terminal devices, etc. Such camera modules include: a ceramic or resin funnel-shaped package housing the solid-state camera element, and a cover glass that is bonded to the periphery of the package using an ultraviolet-curable adhesive to seal the solid-state camera element.

[0189] As described above, the oxide glass and optical element of this embodiment can integrally provide a light-transmitting portion and a light-shielding portion. When the oxide glass and optical element of this embodiment are used as a cover glass, the light-shielding portion can be used to suppress the generation of light spots, ghosting, etc., caused by light reflected from the side surfaces of the cover glass.

[0190] In the oxide glass and optical element of this embodiment, since the light-shielding portion can be formed from the surface to the interior of the glass, the glass composition of the light-shielding portion and the light-transmitting portion can be identical, and they can be combined in a single piece of glass without being joined. Furthermore, in this embodiment, the light-shielding portion can have sufficient light-shielding properties, and the light-transmitting portion can have sufficient light-transmitting properties. Moreover, in this embodiment, since the light-shielding portion can be formed in any shape, and the contrast between the light-shielding portion and the light-transmitting portion is significant, the shape of the light-shielding portion can be controlled with high precision. Furthermore, in the glass of this embodiment, the refractive indices of the light-shielding portion and the light-transmitting portion are substantially the same; therefore, when used as a cover glass, interface reflection between the light-shielding portion and the light-transmitting portion can be suppressed, thereby effectively suppressing stray light.

[0191] The oxide glass and optical element of this embodiment can also be plate-shaped, with a light-transmitting portion in the center when viewed from above, and a light-shielding portion surrounding the light-transmitting portion, and the edges of the glass being light-transmitting portions. The light-shielding portion can be formed on one or both sides. Such glass can also be used as an optical element that functions as a cover glass. When used as a cover glass, the light-shielding portion can be used to suppress the generation of light spots, ghosting, etc., caused by light reflected from the sides of the cover glass. Specifically, examples include... Figure 2 Glass with a light-blocking section, as shown.

[0192] Compared to the light-blocking portion, the light-transmitting portion transmits light more fully. Therefore, light can pass through the light-transmitting portion, causing UV-curable resins, such as UV-curable adhesives, to polymerize and cure. In other words, by making the portion using the UV-curable resin a light-transmitting portion, bonding using the UV-curable resin can be achieved. When the edge of the glass is designated as a light-transmitting portion, light can pass through this edge. Therefore, when such glass is used as a cover glass, light can be transmitted from the edge, thereby fixing the glass itself or other imaging elements using the UV-curable resin.

[0193] Here, in the oxide glass and optical element of this embodiment, the glass surface in contact with the metal film can be selectively colored by heat treatment in a reducing atmosphere as described above, but sometimes the glass surface not in contact with the metal film is also slightly colored. However, by shortening the heat treatment time in the reducing atmosphere, the coloring of areas where coloring is to be suppressed, such as areas intended to be light-transmitting, can be reduced. For example, in... Figure 2As shown, for a plate-shaped glass, when light-shielding portions are formed on the first and second main surfaces of the glass, by halving the heat treatment time, the optical density (OD) of each of the light-shielding portions on the first and second main surfaces will also be approximately halved. However, by forming light-shielding portions of the same shape and in the same position when viewed from above on the first and second main surfaces of the glass, the OD of the light-shielding portion can be made the sum of the OD of the light-shielding portion on the first and second main surfaces. Furthermore, for the light-transmitting portion, by halving the heat treatment time in a reducing atmosphere, the coloration caused by heat treatment is halved and sufficiently reduced. As a result, sufficient light-shielding performance can be ensured for the light-shielding portion, and sufficient light transmission performance can be ensured for the light-transmitting portion. It should be noted that, as long as it is within the range that both light transmission performance of the light-transmitting portion and sufficient light-shielding performance of the light-shielding portion can be ensured, the light-shielding portions on the first and second main surfaces may not be strictly identical in shape, and the positions of the two light-shielding portions when viewed from above may not be strictly identical.

[0194] The oxide glass and optical element of this embodiment can also be plate-shaped and have light-shielding portions of arbitrary shape on the side. The oxide glass and optical element of this embodiment can have light-shielding portions on their entire side surface or can have light-shielding portions patterned into arbitrary shapes. Therefore, when the oxide glass and optical element of this embodiment are used as cover glass, by providing light-shielding portions of arbitrary shapes on the side, stray light from the sides of lead frames and the like surrounding the solid-state imaging element can be suppressed.

[0195] As described above, the oxide glass and optical element of this embodiment, by being plate-shaped and having light-shielding portions on the first and second main surfaces, can prevent stray light from the front of the cover glass when used as a cover glass. Furthermore, the oxide glass and optical element of this embodiment can also be plate-shaped and have light-shielding portions of arbitrary shapes on the first, second, and side surfaces. By using such glass as a cover glass, stray light generated on the front and side surfaces can be suppressed.

[0196] For the oxide glass and optical element of this embodiment, when it is in the form of a plate, the thickness of the glass is not particularly limited and can be less than 1 mm, less than 0.7 mm, or less than 0.5 mm. By being in the form of a plate with a thickness within the above range and by appropriately arranging the light-shielding portion as described above, the oxide glass and optical element of this embodiment can be used as an optical element that has the function of covering glass.

[0197] It should be noted that there is no particular limitation on the thickness of the light-shielding part in the glass cross section, but it is preferably 1 to 300 μm, more preferably 20 to 200 μm, and even more preferably 30 to 150 μm.

[0198] Implementation Method 2

[0199] The optical element of the second embodiment integrally includes a light-transmitting portion and a light-shielding portion with a visible light transmittance lower than that of the light-transmitting portion.

[0200] The optical element comprises oxide glass, and the oxide glass contains P 5+ Nb ions, Bi ions and Li ions + As a component of glass

[0201] The oxide glass described above satisfies one or more of the following (i) and (ii).

[0202] (i) Nb ions and Li + The total content is over 50%.

[0203] (ii) Li content relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

[0204] The optical element of the second embodiment integrally comprises a light-transmitting portion and a light-shielding portion having a visible light transmittance less than that of the light-transmitting portion. Visible light refers to light in the wavelength range of 380 to 1100 nm. That is, in the light-transmitting portion, the minimum internal transmittance of light in the wavelength range of 380 to 1100 nm, when converted to a thickness of 1.0 mm, is preferably 96% or more, and more preferably in the order of 96.5% or more, 97% or more, and 98% or more. In the light-shielding portion, the maximum external transmittance of light in the wavelength range of 380 to 1100 nm, when converted to a thickness of 1.0 mm, is preferably 20% or less, and more preferably in the order of 15% or less, 8% or less, and 5% or less.

[0205] It should be noted that in this embodiment, glass samples with thicknesses of 2.0 mm ± 0.1 mm and 10.0 mm ± 0.1 mm are used. The spectral transmittance in the wavelength range of 380 to 1100 nm is measured according to JOGIS 17 (method for measuring the internal transmittance of optical glass), and the value obtained by converting it to a thickness of 1.0 mm is taken as the internal transmittance.

[0206] Furthermore, external transmittance refers to the percentage of the ratio (I / I0) of the intensity of transmitted light I through the glass to the intensity of incident light I0 incident on the glass; that is, it is the transmittance that also takes into account the surface reflection of the glass surface. External transmittance can be obtained by measuring the transmission spectrum using a spectrophotometer. In this embodiment, the value obtained by converting to a thickness of 1.0 mm is used as the external transmittance.

[0207] Furthermore, the optical element of the second embodiment integrally comprises a light-transmitting portion and a light-shielding portion. Specifically, the light-shielding portion refers to the part of the glass itself that is colored, preferably formed in a layered manner from the glass surface inward. The portion where no light-shielding portion is formed, i.e., the uncolored portion, becomes the light-transmitting portion. As described above, the light-shielding portion is the part of the glass itself that is colored, therefore the glass composition of the light-transmitting portion and the light-shielding portion is the same. However, sometimes the valence of the glass components (cations) differs between the light-transmitting portion and the light-shielding portion. Furthermore, the phrase "same glass composition" in this invention means that the compositional analysis results are consistent within the error range. The method for forming the light-shielding portion can be the same as in the first embodiment. Additionally, the shape of the light-shielding portion, and other characteristics besides those described above, can also be the same as in the first embodiment.

[0208] The optical element in the second embodiment comprises P 5+ Nb ions, Bi ions and Li ions + It is made of oxide glass as a glass component. In this invention, oxide glass refers to glass containing O. 2- As an anionic component, and O 2- Glass with an anion content of 80% or more.

[0209] In the second embodiment, P in the above-mentioned oxide glass 5+ The lower limit of the content is preferably 7%, and more preferably in the order of 10%, 15%, 22%, and 27%. Additionally, P... 5+ The upper limit of the content is preferably 43%, and more preferably in the order of 40%, 37%, 34%, and 32%.

[0210] P 5+ It is a network-forming component of glass. From the viewpoint of forming a light-shielding portion with excellent visible light blocking properties and a light-transmitting portion with excellent light transmission, thereby obtaining a glass with a low specific gravity, P... 5+ The content of P is preferably within the above-mentioned range. On the other hand, P 5+ Excessive content of certain substances can lead to decreased chemical durability and reduced meltability.

[0211] In the second embodiment, the lower limit of the Nb ion content in the oxide glass is preferably 10%, and more preferably in the order of 11%, 12%, 14%, and 16%. Furthermore, the upper limit of the Nb ion content is preferably 21%, and more preferably in the order of 20%, 19.5%, 19%, and 18%. Regarding Nb ions, besides Nb... 5+ In addition, it can also contain Nb ions with different valences.

[0212] Nitrogen ions contribute to increasing the refractive index and are a component that enhances the coloration of glass. Furthermore, they improve the thermal stability and chemical durability of glass. From the viewpoint of obtaining glass that can form both a light-shielding portion with excellent visible light blocking properties and a light-transmitting portion with excellent transmittance, the Nb ion content is preferably within the aforementioned range. On the other hand, excessive Nb ion content may lead to a decrease in the glass's devitrification resistance and a decrease in the transmittance of the light-transmitting portion to light in the short wavelength range (300–450 nm).

[0213] In the second embodiment, the Bi ion content in the oxide glass is preferably greater than 0%, with a lower limit of 0.2%, and more preferably in the order of 0.3%, 0.4%, and 0.5%. Furthermore, the upper limit of the Bi ion content is preferably 6%, and more preferably in the order of 5%, 4%, 2%, and 1%. Regarding Bi ions, besides Bi... 3+ In addition, it can also contain Bi ions with different valences.

[0214] Bi ions contribute to increasing the refractive index and enhance the coloration of the glass. From the viewpoint of obtaining glass capable of forming both a light-shielding portion with excellent visible light shielding properties and a light-transmitting portion with excellent transmittance, the Bi ion content is preferably within the aforementioned range. On the other hand, excessive Bi ion content may lead to a decrease in the transmittance of the light-transmitting portion to light in the short wavelength range (300–450 nm). Conversely, insufficient Bi ion content may result in a reduction in the light-shielding properties of the light-shielding portion.

[0215] In the second embodiment, Li in the above-mentioned oxide glass + The lower limit of the content is preferably 20%, and more preferably in the order of 25%, 30%, 35%, and 40%. Additionally, Li... + The upper limit of the content is preferably 60%, and more preferably in the order of 55%, 50%, and 47%.

[0216] From the perspective of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission properties, thereby obtaining a glass with low specific gravity, Li + The content of [Li] is preferably within the above-mentioned range. Furthermore, it becomes easier to chemically strengthen the glass. On the other hand, [Li] + Excessive content of certain substances can lead to a decrease in the thermal stability of the glass.

[0217] In addition, in the second embodiment, the oxide glass satisfies one or more of the following (i) and (ii).

[0218] (i) Nb ions and Li + The total content is over 50%.

[0219] (ii) Li content relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The value is above 0.5.

[0220] (i) In the second embodiment, Nb ions and Li ions in the oxide glass described above + The lower limit of the total content is preferably 50%, and more preferably in the order of 52%, 54%, and 57%. In addition, the upper limit of the total content is preferably 75%, and more preferably in the order of 70%, 66%, and 63%.

[0221] From the perspective of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission, thereby obtaining a glass with low specific gravity, Nb ions and Li + The total content is preferably within the range described above. On the other hand, if the total content is too low, there is a risk of reduced light-blocking properties of the light-blocking portion.

[0222] (ii) In the second embodiment, the Li content in the oxide glass relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The lower limit of the cation ratio is preferably 0.5, and more preferably in the order of 0.7, 0.8, 0.9, and 1. The cation ratio can also be 1.

[0223] From the viewpoint of forming a light-shielding part with excellent visible light shielding properties and a light-transmitting part with excellent light transmission properties, thereby obtaining a glass with a low specific gravity, the cation ratio [Li] + / (Li + +Na + +K + The above-mentioned range is preferred. On the other hand, if the cation ratio is too small, there is a risk of reduced light-shielding properties of the light-shielding portion.

[0224] In the second embodiment, Ba in the above-mentioned oxide glass 2+ The upper limit of the content is preferably 5%, and more preferably in the order of 4%, 3%, 2%, and 1%. Additionally, Ba... 2+ The lower limit of the content of Ba is preferably 0%. 2+ The content can also be 0%.

[0225] Ba 2+It has the effect of improving the thermal stability and melting properties of glass. From the viewpoint of obtaining glass with a low specific gravity, Ba... 2+ The content of [specific component] is preferably within the range mentioned above. On the other hand, Ba [specific component] 2+ Excessive content of certain substances can lead to an increased specific gravity and decreased resistance to devitrification. Furthermore, it can reduce the thermal stability of the glass.

[0226] In the second embodiment, Zr in the above-mentioned oxide glass 4+ The upper limit of the content of Zr is preferably 2%, and more preferably in the order of 1.5%, 1%, and 0.5%. Additionally, Zr... 4+ The lower limit of Zr content is preferably 0%. 4+ The content can also be 0%.

[0227] Zr 4+ It has the effect of improving the thermal stability of glass. From the viewpoint of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission, thereby obtaining glass with a low specific gravity, Zr... 4+ The content of Zr is preferably within the range mentioned above. On the other hand, Zr 4+ When the content of [a certain substance] is too high, there is a tendency for the thermal stability and melting properties of the glass to decrease.

[0228] In the second embodiment, the upper limit of the total content of Ti ions and W ions in the oxide glass is preferably 5%, and more preferably in the order of 4%, 3%, 2%, and 1%. Furthermore, the lower limit of this total content is preferably 0%. The total content may also be 0%.

[0229] From the viewpoint of obtaining glass capable of forming both a light-shielding portion with excellent light-shielding properties and a light-transmitting portion with excellent light transmission properties, the total content of Ti ions and W ions is preferably within the aforementioned range. On the other hand, if this total content is too high, there is a risk that the transmittance of the light-transmitting portion to light in the short wavelength range (wavelength 300–450 nm) will decrease.

[0230] In the second embodiment, the content and ratio of glass components other than those described above in the oxide glass can be the same as in the first embodiment. Furthermore, in the second embodiment, the oxide glass can be manufactured in the same manner as the oxide glass of the first embodiment and has the same glass properties. Moreover, the optical element of the second embodiment can be manufactured in the same manner as that of the first embodiment.

[0231] Third implementation method

[0232] The optical element in the third embodiment comprises glass with a specific gravity of 3.5 or less.

[0233] This optical element integrally comprises a light-transmitting portion with an internal transmittance of 96% or more at a wavelength of 380 nm when converted to a thickness of 1.0 mm, and a light-shielding portion with an optical density OD of 0.5 or more at a wavelength of 1100 nm.

[0234] The glass composition of the light-transmitting part and the light-shielding part is the same.

[0235] The optical element in the third embodiment is made of glass with a specific gravity of 3.5 or less. The specific gravity of the glass is preferably 3.4 or less, and more preferably 3.3 or less, 3.2 or less.

[0236] By making optical elements from glass with a specific gravity within the aforementioned range, glass breakage can be prevented and glass warping suppressed during the manufacturing process. On the other hand, if the specific gravity of the glass is too high, it is prone to breakage during the manufacturing process, and there is a risk of glass warping.

[0237] The optical element of the third embodiment integrally comprises a light-transmitting portion having an internal transmittance of 96% or more at a wavelength of 380 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having an optical density OD of 0.5 or more at a wavelength of 1100 nm.

[0238] The optical element of the third embodiment integrally includes a light-transmitting portion and a light-shielding portion. Specifically, the light-shielding portion refers to the part of the glass itself that is colored, and preferably is formed in a layered manner from the glass surface inward. The portion where no light-shielding portion is formed, that is, the uncolored portion that is not colored, is the light-transmitting portion.

[0239] In the optical element of the third embodiment, the internal transmittance of the light-transmitting portion at a wavelength of 380 nm, when converted to a thickness of 1.0 mm, is 96% or more, preferably 96.5% or more, and more preferably 97% or more and 98% or more in that order.

[0240] It should be noted that in this embodiment, glass samples with thicknesses of 2.0 mm ± 0.1 mm and 10.0 mm ± 0.1 mm are used. The spectral transmittance in the wavelength range of 380 to 1100 nm is measured according to JOGIS 17 (method for measuring the internal transmittance of optical glass), and the value obtained by converting it to a thickness of 1.0 mm is taken as the internal transmittance.

[0241] In the optical element of the third embodiment, the light-shielding portion has an optical density OD of 0.5 or more at a wavelength of 1100 nm, preferably 0.8 or more, and more preferably 1.0 or more and 1.3 or more. On the other hand, the light-transmitting portion has an optical density OD of 0.15 or less at a wavelength of 1100 nm, more preferably 0.1 or less.

[0242] Optical density OD is expressed as shown in the following formula. It is a value obtained by adding a negative sign (-) to the common logarithm of the ratio of incident light intensity I0 to transmitted light intensity I.

[0243] OD = -log 10 (I / I o )

[0244] In the optical element of the third embodiment, the OD of the light-shielding part is large, while the OD of the light-transmitting part is small. In the measurement of OD, when measuring light passing through both the light-shielding part and the light-transmitting part, since the OD of the light-transmitting part is small enough, the OD of the light-shielding part becomes dominant.

[0245] Furthermore, in an optical element with two opposing surfaces, the OD is approximately twice that of an optical element with light-shielding portions of the same thickness and tinting degree on both surfaces.

[0246] Furthermore, in the optical element of this embodiment, the OD decreases with increasing wavelength across the wavelength range from the visible light region to the near-infrared region. Therefore, in the light-shielding portion, for example, the OD at a wavelength of 780 nm is greater than the OD at a wavelength of 1100 nm.

[0247] Therefore, when there is a wavelength range for which light blocking is desired, the design is carried out by increasing the OD (exposure potential) at the longer wavelengths within that range. When designing glass that only blocks visible light, it is sufficient to set the OD to be higher at the longer wavelengths in the visible light region (e.g., 780 nm). Furthermore, when designing glass that blocks light from the visible light region to the near-infrared region, it is sufficient to set the OD to be higher at the wavelengths in the near-infrared region (e.g., 1100 nm). The OD can be controlled by adjusting the thickness of the light-blocking portion, the degree of coloration of the light-blocking portion, etc.

[0248] In the optical element of the third embodiment, as described above, the light-shielding portion is the part of the glass itself that is colored, therefore the glass composition of the light-transmitting portion and the light-shielding portion is the same. However, sometimes the valence of the glass components (cations) differs between the light-transmitting portion and the light-shielding portion. Furthermore, the phrase "same glass composition" in this invention means that the compositional analysis results are consistent within the error range.

[0249] The coloring of the light-shielding part is preferably a reduced color derived from the glass composition, and more preferably a reduced color derived from a transition metal. Examples of transition metals include Ti, Nb, W, and Bi.

[0250] In the optical element of the third embodiment, since a light-shielding portion can be formed on a part of the glass, the light-shielding portion and the light-transmitting portion have the same glass composition and are not joined, so that a single piece of glass simultaneously has both a light-shielding portion and a light-transmitting portion. Furthermore, in this embodiment, the light-shielding portion has sufficient light-shielding properties, and the light-transmitting portion has sufficient light-transmitting properties. Moreover, in this embodiment, since the light-shielding portion and the light-transmitting portion can be formed into arbitrary shapes, and the contrast between them is significant, the shape of the light-shielding portion can be controlled with high precision. Furthermore, in the glass of this embodiment, the refractive indices of the light-shielding portion and the light-transmitting portion are substantially the same; therefore, when used as a cover glass, interface reflection between the light-shielding portion and the light-transmitting portion can be suppressed, thereby effectively suppressing stray light.

[0251] The method for forming the light-shielding portion can be the same as in the first embodiment. Furthermore, the shape of the light-shielding portion and other characteristics besides those described above can also be the same as in the first embodiment.

[0252] The optical element in the third embodiment is preferably composed of P 5+ Nb ions, Bi ions and Li ions + Oxide glass is formed as a glass component. In this invention, oxide glass refers to glass containing O. 2- As an anionic component, and O 2- Glass with an anion content of 80% or more.

[0253] In the third embodiment, P in the above-mentioned oxide glass 5+ The lower limit of the content is preferably 7%, and more preferably in the order of 10%, 15%, 22%, and 27%. Additionally, P... 5+ The upper limit of the content is preferably 43%, and more preferably in the order of 40%, 37%, 34%, and 32%.

[0254] P 5+ P is a network-forming component of glass. From the viewpoint of forming a light-shielding portion with excellent visible light blocking properties and a light-transmitting portion with excellent light transmission, thereby obtaining a glass with a low specific gravity, P... 5+ The content of P is preferably within the above-mentioned range. On the other hand, P 5+ Excessive content of certain substances can lead to decreased chemical durability and reduced meltability.

[0255] In the third embodiment, the lower limit of the Nb ion content in the oxide glass is preferably 10%, and more preferably in the order of 11%, 12%, 14%, and 16%. Furthermore, the upper limit of the Nb ion content is preferably 21%, and more preferably in the order of 20%, 19.5%, 19%, and 18%. Regarding Nb ions, besides Nb... 5+ In addition, it can also contain Nb ions with different valences.

[0256] Nitrogen ions contribute to increasing the refractive index and are a component that enhances the coloration of glass. Furthermore, they improve the thermal stability and chemical durability of glass. From the viewpoint of obtaining glass capable of forming both a light-shielding portion with excellent visible light blocking properties and a light-transmitting portion with excellent transmittance, the Nb ion content is preferably within the aforementioned range. On the other hand, excessive Nb ion content may lead to a decrease in the glass's devitrification resistance, and also a decrease in the transmittance of the light-transmitting portion to light in the short wavelength range (300–450 nm).

[0257] In the third embodiment, Li in the above-mentioned oxide glass + The lower limit of the content is preferably 20%, and more preferably in the order of 25%, 30%, 35%, and 40%. Additionally, Li... + The upper limit of the content is preferably 60%, and more preferably in the order of 55%, 50%, and 47%.

[0258] From the perspective of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission properties, thereby obtaining a glass with low specific gravity, Li + The content of [Li] is preferably within the above-mentioned range. Furthermore, it becomes easier to chemically strengthen the glass. On the other hand, [Li] + Excessive content of certain substances can lead to a decrease in the thermal stability of the glass.

[0259] In the third embodiment, Nb ions and Li ions in the above-mentioned oxide glass + The lower limit of the total content is preferably 48%, and more preferably in the order of 50%, 52%, 54%, and 57%. In addition, the upper limit of the total content is preferably 75%, and more preferably in the order of 70%, 66%, and 63%.

[0260] From the perspective of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission, thereby obtaining a glass with low specific gravity, Nb ions and Li + The total content is preferably within the range described above. On the other hand, if the total content is too low, there is a risk of reduced light-blocking properties of the light-blocking portion.

[0261] In the third embodiment, the Bi ion content in the oxide glass is preferably greater than 0%, with a lower limit of 0.2%, and more preferably in the order of 0.3%, 0.4%, and 0.5%. Furthermore, the upper limit of the Bi ion content is preferably 6%, and more preferably in the order of 5%, 4%, 2%, and 1%. Regarding Bi ions, besides Bi... 3+ In addition, it can also contain Bi ions with different valences.

[0262] Bi ions contribute to increasing the refractive index and also enhance the coloration of the glass. From the viewpoint of obtaining glass capable of forming both a light-shielding portion with excellent visible light shielding properties and a light-transmitting portion with excellent transmittance, the Bi ion content is preferably within the aforementioned range. On the other hand, excessive Bi ion content may lead to a decrease in the transmittance of the light-transmitting portion to light in the short wavelength range (300–450 nm). Conversely, insufficient Bi ion content may result in a reduction in the light shielding properties of the light-shielding portion.

[0263] In the third embodiment, Ba in the above-mentioned oxide glass 2+ The upper limit of the content is preferably 5%, and more preferably in the order of 4%, 3%, 2%, and 1%. Additionally, Ba... 2+ The lower limit of the content of Ba is preferably 0%. 2+ The content can also be 0%.

[0264] Ba 2+ It has the effect of improving the thermal stability and melting properties of glass. From the viewpoint of obtaining glass with a low specific gravity, Ba... 2+ The content of [specific component] is preferably within the range mentioned above. On the other hand, Ba [specific component] 2+ Excessive content of certain substances can lead to an increased specific gravity and decreased resistance to devitrification. Furthermore, it can reduce the thermal stability of the glass.

[0265] In the third embodiment, Zr in the above-mentioned oxide glass 4+ The upper limit of the content of Zr is preferably 2%, and more preferably in the order of 1.5%, 1%, and 0.5%. Additionally, Zr... 4+ The lower limit of Zr content is preferably 0%. 4+ The content can also be 0%.

[0266] Zr 4+ It has the effect of improving the thermal stability of glass. From the viewpoint of forming a light-shielding part with excellent visible light blocking properties and a light-transmitting part with excellent light transmission, thereby obtaining glass with a low specific gravity, Zr... 4+ The content of Zr is preferably within the range mentioned above. On the other hand, Zr 4+ When the content of [a certain substance] is too high, there is a tendency for the thermal stability and melting properties of the glass to decrease.

[0267] In the third embodiment, the upper limit of the total content of Ti ions and W ions in the oxide glass is preferably 5%, and more preferably in the order of 4%, 3%, 2%, and 1%. Furthermore, the lower limit of this total content is preferably 0%. The total content may also be 0%.

[0268] From the viewpoint of obtaining glass capable of forming both a light-shielding portion with excellent light-shielding properties and a light-transmitting portion with excellent light transmission properties, the total content of Ti ions and W ions is preferably within the aforementioned range. On the other hand, if this total content is too high, there is a risk that the transmittance of the light-transmitting portion to light in the short wavelength range (wavelength 300–450 nm) will decrease.

[0269] In the third embodiment, the Li content in the oxide glass is relative to Li + Na + and K + The total content of cation ratio [Li + / (Li + +Na + +K + The lower limit of the cation ratio is preferably 0.5, and more preferably in the order of 0.7, 0.8, 0.9, and 1. The cation ratio can also be 1.

[0270] From the viewpoint of forming a light-shielding part with excellent visible light shielding properties and a light-transmitting part with excellent light transmission properties, and obtaining a glass with a low specific gravity, the cation ratio [Li] + / (Li + +Na + +K + The above-mentioned range is preferred. On the other hand, if the cation ratio is too small, there is a risk of reduced light-shielding properties of the light-shielding portion.

[0271] In the third embodiment, the content and ratio of the glass components other than those described above in the oxide glass can be the same as in the first embodiment. Furthermore, in the third embodiment, the oxide glass can be manufactured in the same manner as the oxide glass of the first embodiment and has the same glass properties. Moreover, the optical element of the third embodiment can be manufactured in the same manner as that of the first embodiment.

[0272] Example

[0273] The present invention will now be described in detail with reference to the embodiments, but the present invention is not limited to these embodiments.

[0274] Glass samples with the glass composition shown in Table 1 were prepared in the following order, and various evaluations were performed.

[0275] [Table 1]

[0276]

[0277] [Glass Manufacturing]

[0278] Oxides, hydroxides, metaphosphates, carbonates, and nitrates corresponding to the constituent components of glass were prepared as raw materials. These raw materials were weighed and mixed thoroughly to achieve the composition shown in Table 1. The resulting mixed raw materials (batch raw materials) were placed in a platinum crucible and heated at 1100℃~1450℃ for 2~3 hours to produce molten glass. The molten glass was stirred to homogenize it. After clarification, the molten glass was cast into a mold preheated to an appropriate temperature. The cast glass was heat-treated near the glass transition temperature Tg for about 1 hour and then naturally cooled to room temperature in a furnace. It was then processed into a size of 40mm in length, 60mm in width, and 15mm in thickness. The two 40mm×60mm surfaces were precision polished (optical polishing) to obtain a glass sample.

[0279] [Confirmation of glass composition]

[0280] The contents of each glass component were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) for the obtained glass samples, and the compositions shown in Table 1 were confirmed.

[0281] [Determination of optical properties]

[0282] For the obtained glass samples, the refractive index nd, Abbe number νd, specific gravity, glass transition temperature Tg, and yield temperature Ts were determined. The results are shown in Table 1.

[0283] (i) Refractive index nd and Abbe number νd

[0284] The measurements were performed based on Japanese Industrial Standard JISB-7071-1.

[0285] (ii) Specific gravity

[0286] Specific gravity was determined using the Archimedes method.

[0287] (iii) Glass transition temperature Tg and yield temperature Ts

[0288] The glass transition temperature Tg and yield temperature Ts were determined using a thermomechanical analysis apparatus (TMA4000S) manufactured by MAC Science at a heating rate of 4°C / min.

[0289] (iv) Internal transmittance

[0290] The obtained glass samples were processed into thicknesses of 2.0 mm ± 0.1 mm and 10.0 mm ± 0.1 mm. The spectral transmittance in the wavelength range of 380–1100 nm was measured according to JOGIS 17 (Method for Determination of Internal Transmittance of Optical Glass), and the value was converted to a thickness of 1.0 mm as the internal transmittance. The internal transmittance at a wavelength of 380 nm is shown in Table 2.

[0291] [Formation of the light-blocking portion]

[0292] The obtained glass sample was processed into a size of 20mm in length, 20mm in width, and 1.0mm in thickness, and the two 20mm×20mm surfaces were precision polished (optical polishing). On one side of the optically polished surface, a metal film (Pt-Pd film) of arbitrary shape was formed by sputtering (sputtering current 15mA, film formation time 900 seconds).

[0293] The glass sample after the metal film was formed was heat-treated for 6 hours at the treatment temperatures shown in Table 2 while being supplied with a synthesis gas (hydrogen 3 vol% and nitrogen 97 vol%) as a reducing atmosphere at a flow rate of 0.2 L / min. It should be noted that the treatment temperature was set to be 15–20 °C lower than the glass transition temperature Tg (the range of [Tg-20 °C] to [Tg-15 °C]).

[0294] The metal film was peeled off by polishing. A glass sample with a light-shielding portion having a shape substantially the same as the metal film when viewed from above was obtained.

[0295] [OD Measurement]

[0296] For a glass sample with a light-shielding section, the incident light intensity I0 and transmitted light intensity I of the light-shielding section at a wavelength of 1100 nm were measured, and the optical density (OD) was calculated using the following formula. The results are shown in Table 2.

[0297] OD = -log 10 (I / I0)

[0298] [Table 2]

[0299] .

Claims

1. An oxide glass, wherein P 5+ a content of 27 to 43 cation %, the content of Nb ions is 10 to 21 cation%, Li + 35-60 cation %, Nb ions and Li + 48 to 70 cation %, the content of Bi ions is more than 0 cation% and 6 cation% or less, Ba 2+ a content of 5 cation % or less, Zr 4+ 2 cation % or less, the total content of Ti ions and W ions is 4 cation% or less, Li + content relative to Li + , Na + , and K + , and the cation ratio [Li + / (Li + + Na + + K + )] is 0.7 or more, The total content of Ti ions, Nb ions, W ions, and Bi ions relative to P 5+ 3+ 4+ The cation ratio [(Ti+Nb+W+Bi) / (P 5+ 3+ 4+ )] is 0.7 or less.​​​​ 2. The oxide glass according to claim 1, wherein O 2- the content of the anion is 90% or more.

3. The oxide glass according to claim 2, wherein O 2- the content of the anion is 95% or more.

4. The oxide glass according to claim 2, wherein O 2- the content of the anion is 97% or more.

5. The oxide glass according to claim 2, wherein O 2- the content of the anion is 98% or more.

6. The oxide glass according to claim 2, wherein O 2- at a content of 100 anionic %.

7. The oxide glass according to claim 1, wherein P 5+ the upper limit of the content of the cationic monomer is 40%, the lower limit of the content of Nb ions is 11 cation%, the upper limit of the content of Nb ions is 20 cation%, Li + the lower limit of the content of the cationic group is 40%, Li + the upper limit of the content of the cationic Li is 55%, the lower limit of the content of Bi ions is 0.2 cation%, the upper limit of the content of Bi ions is 5 cation%, Ba 2+ the upper limit of the content of the Ba2+ cation is 4 cation %, Zr 4+ the upper limit of the content of the cation is 1.5 cation %, B 3+ the upper limit of the content of the cationic surfactant is 15%, B 3+ the lower limit of the content of the cationic species is 1 %, Si 4+ the upper limit of the content of the Si is 10 cation %, Si 4+ the lower limit of the content of the cation is 0.1 cation %, Al 3+ the upper limit of the content of the cationic group is 10 cationic %, the upper limit of the content of Ti ions is 2.0 cation%, the upper limit of the content of W ions is 1.5 cation%, Ta 5+ the upper limit of the content of the cationic Ta is 5 %, Na + the upper limit of the content of the Na cation is 7 cation %, K + the upper limit of the content of the cationic species being 7%, Rb + the upper limit of the content of Rb is 5 cation %, Cs + the upper limit of the content of the cationic Cs is 5 %, Mg 2+ the upper limit of the content of the cation of the formula (I) is 15 cation %, Ca 2+ the upper limit of the content of the cationic group is 15 cation %, Sr 2+ the upper limit of the content of Sr is 15 cation %, Zn 2+ the upper limit of the content of Zn is 8 cation %, Ga 3+ the upper limit of the content of the Ga cation is 3 cation %, In 3+ the upper limit of the content of the cationic species is 3 cationic %, Sc 3+ the upper limit of the content of the cationic species being 3 %, Hf 4+ the upper limit of the content of the Hf cation is 3 cation %, Lu 3+ the upper limit of the content of Lu is 3 cation %, Ge 4+ the upper limit of the content of Ge is 3 cation %, La 3+ The upper limit of the content of the cation is 5 cation %, Gd 3+ the upper limit of the content of Gd is 5 cation %, Y 3+ the upper limit of the content of the cationic monomer is 5%, Yb 3+ the upper limit of the content of the Yb cation is 3 cation %, the content of Sb2O3 is less than 2 mass%, each of the contents of SnO2 and CeO2 is less than 2 mass%.

8. The oxide glass according to claim 7, wherein P 5+ the upper limit of the content of the cationic group is 37 cation %, the lower limit of the content of Nb ions is 12 cation%, the upper limit of the content of Nb ions is 19.5 cation%, Li + the upper limit of the content of the cationic Li is 50%, the lower limit of the content of Bi ions is 0.3 cation%, the upper limit of the content of Bi ions is 4 cation%, Ba 2+ the upper limit of the content of the Ba cation is 3 cation %, Zr 4+ the upper limit of the content of the Zr cation is 1 cation %, B 3+ the upper limit of the content of the cationic monomer is 10%, B 3+ the lower limit of the content of the cationic species being 3%, Si 4+ the upper limit of the content of Si is 7 cation %, Si 4+ the lower limit of the content of the cation is 0.2 cation %, Al 3+ the upper limit of the content of the cationic Al is 7%, the upper limit of the content of Ti ions is 1.5 cation%, the upper limit of the content of W ions is 1.0 cation%, Ta 5+ the upper limit of the content of the cation of 3 cation %, Na + the upper limit of the content of the cation is 5%, K + the upper limit of the content of the cationic species being 5%, Rb + the upper limit of the content of Rb is 3 cation %, Cs + the upper limit of the content of the cation Cs is 3 %, Mg 2+ the upper limit of the content of the cation is 10%, Ca 2+ the upper limit of the content of the cationic group is 10 cationic %, Sr 2+ the upper limit of the content of the Sr cation is 10 cation %, Zn 2+ the upper limit of the content of Zn is 6 cation %, Ga 3+ the upper limit of the content of the Ga cation is 2 cation %, In 3+ the upper limit of the content of the 2 cation is 2%, Sc 3+ The upper limit of the content of the cation of 2 is 2 cation %. Hf 4+ the upper limit of the content of the 2 cation is 2%, Lu 3+ The upper limit of the content of Lu is 2 cation %, Ge 4+ The upper limit of the content of the Ge is 2 cation %, La 3+ The upper limit of the content of the La cation is 4 cations %. Gd 3+ the upper limit of the content of Gd is 4 cation %, Y 3+ the upper limit of the content of the cationic species being 4%, Yb 3+ the upper limit of the content of the Yb cation is 2 cation %, the content of Sb2O3 is less than 1 mass%, each of the contents of SnO2 and CeO2 is less than 1 mass%.

9. The oxide glass according to claim 7, wherein P 5+ the upper limit of the content of the cationic group is 34 cation %, the lower limit of the content of Nb ions is 14 cation%, the upper limit of the content of Nb ions is 19 cation%, Li + the upper limit of the content of Li is 47 cation %, the lower limit of the content of Bi ions is 0.4 cation%, the upper limit of the content of Bi ions is 2 cation%, Ba 2+ the upper limit of the content of the 2 cation is 2%, Zr 4+ the upper limit of the content of the cation of 0.5 cation %, B 3+ the upper limit of the content of the cationic species being 8 cationic %, B 3+ the lower limit of the content of the cationic surfactant is 5%, Si 4+ the upper limit of the content of Si is 5 cation %, Si 4+ the lower limit of the content of the cation is 0.3 cation %, Al 3+ the upper limit of the content of the cationic Al is 5 %, the upper limit of the content of Ti ions is 1.0 cation%, the upper limit of the content of W ions is 0.5 cation%, Ta 5+ the upper limit of the content of the 2 cation is 2%, Na + the upper limit of the content of the cation is 3 %, K + the upper limit of the content of the cationic species being 3 %, Rb + the upper limit of the content of Rb is 1 cation %, Cs + the upper limit of the content of the cationic Cs is 1 %, Mg 2+ the upper limit of the content of the cation is 5%, Ca 2+ the upper limit of the content of the cationic species being 5%, Sr 2+ the upper limit of the content of Sr is 5 cation %, Zn 2+ the upper limit of the content of the Zn cation is 4 cation %, Ga 3+ the upper limit of the content of the Ga cation is 1 cation %, In 3+ the upper limit of the content of the cationic species is 1 %, Sc 3+ the upper limit of the content of the cationic species is 1 %, Hf 4+ the upper limit of the content of the Hf is 1 cation %, Lu 3+ the upper limit of the content of 1 cation % Ge 4+ the upper limit of the content of the cation of 1 cation %, La 3+ the upper limit of the content of the cation of 3 cation %, Gd 3+ the upper limit of the content of Gd is 3 cation %, Y 3+ the upper limit of the content of the cationic species being 3 %, Yb 3+ the upper limit of the content of Yb is 1 cation %, the content of Sb2O3 is less than 0.5 mass%, each of the contents of SnO2 and CeO2 is less than 0.5 mass%.

10. The oxide glass according to claim 7, wherein P 5+ the upper limit of the content of the cationic group is 32 cation %, the lower limit of the content of Nb ions is 16 cation%, the upper limit of the content of Nb ions is 18 cation%, the lower limit of the content of Bi ions is 0.5 cation%, the upper limit of the content of Bi ions is 1 cation%, Ba 2+ the upper limit of the content of the 1 cation is 1%, B 3+ the lower limit of the content of the cationic species being 6%, Si 4+ the upper limit of the content of the Si is 3 cation %, Si 4+ the lower limit of the content of the cation is 0.4 cation %, Al 3+ the upper limit of the content of Al is 3 cation %, the upper limit of the content of Ti ions is 0.5 cation%, Ta 5+ the upper limit of the content of the 1 cation is 1%, Na + the upper limit of the content of the 1 cation is 1%, K + the upper limit of the content of the cationic species is 1 %, Rb + The upper limit of the content of Rb is 0.5 cation %, Cs + The upper limit of the content of Cs is 0.5 cation %, Mg 2+ the upper limit of the content of the Mg cation is 3 %, Ca 2+ the upper limit of the content of the cationic species being 3 %, Sr 2+ the upper limit of the content of the Sr cation is 3 cation %, Zn 2+ the upper limit of the content of the Zn2+ cation is 2 %, the content of Sb2O3 is less than 0.2 mass%, each of the contents of SnO2 and CeO2 is less than 0.1 mass%.

11. The oxide glass according to claim 7, wherein Si 4+ the upper limit of the content of the Si is 2 cation %, Si 4+ the lower limit of the content of Si is 0.5 cation %, Al 3+ the upper limit of the content of the cationic Al is 1 %, Mg 2+ the upper limit of the content of the 1 cation is 1%, Ca 2+ the upper limit of the content of the cationic species being 1 %, Sr 2+ the upper limit of the content of the 1 cation is 1%, the content of Sb2O3 is less than 0.1 mass%.

12. The oxide glass according to claim 7, wherein Si 4+ the upper limit of the content of the Si is 1 cation %, the content of Sb2O3 is less than 0.05 mass%.

13. The oxide glass according to claim 1, wherein Nb ions and Li + the lower limit of the total content of Li and Na is 50 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 75 cation %, the upper limit of the total content of Ti ions and W ions is 3 cation%, The lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.8, The upper limit of the ratio [B 3+ / P 5+ ] of cations is 0.5, P 5+ , B 3+ , Si 4+ and Al 3+ with a lower limit of 29 cations % for the total content [P 5+ +B 3+ +Si 4+ +Al 3+ ], The upper limit for the total content of [P 5+ + B 3+ + Si 4+ + Al 3+ ] is 50 cation %, the lower limit of the total content [Ti+Nb+W] of Ti ions, Nb ions and W ions is 10 cations%, the upper limit of the total content [Ti+Nb+W] is 21 cations%, the lower limit of the total content [Ti+Nb+W+Bi] of Ti ions, Nb ions, W ions and Bi ions is 11 cations%, the upper limit of the total content [Ti+Nb+W+Bi] is 21.5 cations%, the lower limit of the cation ratio [(Ti + Nb + W + Bi) / (P 5+ + B 3+ + Si 4+ )] is 0.36, The upper limit of the cation ratio [(Ti + Nb + W + Bi) / (P 5+ + B 3+ + Si 4+ )] is 0.64, Li + and Na + The upper limit for the total content of Li + and Na + is 60 cations %, The lower limit of the total content of [Li + +Na + ] is 20 cation %, Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ The upper limit of the total content of Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ is 30 cation %.

14. The oxide glass according to claim 13, wherein Nb ions and Li + The lower limit of the total content of Li and Nb ions is 52 cation %. Nb ions and Li + The upper limit of the total content of Li and Nb ions is 70 cation %, the upper limit of the total content of Ti ions and W ions is 2 cations%, the lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.9, The upper limit of the ratio [B 3+ / P 5+ ] of cations is 0.45, P 5+ , B 3+ , Si 4+ and Al 3+ with a lower limit of 31 cations % for the total content [P 5+ + B 3+ + Si 4+ + Al 3+ ] The upper limit for the total content of [P 5+ + B 3+ + Si 4+ + Al 3+ ] is 44 cations %, the lower limit of the total content [Ti+Nb+W] of Ti ions, Nb ions and W ions is 11 cations%, the upper limit of the total content [Ti+Nb+W] is 20 cations%, the lower limit of the total content [Ti+Nb+W+Bi] of Ti ions, Nb ions, W ions and Bi ions is 12 cations%, the upper limit of the total content [Ti+Nb+W+Bi] is 20.5 cations%, the lower limit of the cation ratio [(Ti + Nb + W + Bi) / (P 5+ + B 3+ + Si 4+ )] is 0.38, Li + and Na + The upper limit for the total content of Li + and Na + is 55 cations %. The lower limit of the total content of [Li + +Na + ] is 25 cation %, Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ in total [Mg 2+ + Ca 2+ + Sr 2+ + Ba 2+ ] is 25 cation %.

15. The oxide glass according to claim 13, wherein Nb ions and Li + the lower limit of the total content of the cations being 54 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 66 cation %, the upper limit of the total content of Ti ions and W ions is 1 cations%, the lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 1, The upper limit of the ratio [B 3+ / P 5+ ] of cations is 0.4, P 5+ , B 3+ , Si 4+ and Al 3+ with a lower limit of 33 cations % for the total content [P 5+ +B 3+ +Si 4+ +Al 3+ ] The upper limit for the total content of [P 5+ + B 3+ + Si 4+ + Al 3+ ] is 41 cations %, the lower limit of the total content [Ti+Nb+W] of Ti ions, Nb ions and W ions is 12 cations%, the upper limit of the total content [Ti+Nb+W] is 19.5 cations%, the lower limit of the total content [Ti+Nb+W+Bi] of Ti ions, Nb ions, W ions and Bi ions is 14 cations%, the upper limit of the total content [Ti+Nb+W+Bi] is 20 cations%, the lower limit of the cation ratio [(Ti + Nb + W + Bi) / (P 5+ + B 3+ + Si 4+ )] is 0.4, Li + and Na + The upper limit for the total content of Li + and Na + is 50 cations %. The lower limit of the total content of [Li + +Na + ] is 30 cation %. Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ . The upper limit of the total content of Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ is 20 cation %.

16. The oxide glass according to claim 13, wherein Nb ions and Li + the lower limit of the total content of Li and Na being 57 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 63 cation %, The upper limit of the ratio [B 3+ / P 5+ ] of cations is 0.35, P 5+ , B 3+ , Si 4+ and Al 3+ with a lower limit of 34 cations% for the total content [P 5+ + B 3+ + Si 4+ + Al 3+ ] The upper limit for the total content of [P 5+ + B 3+ + Si 4+ + Al 3+ ] is 38 cation %, the lower limit of the total content [Ti+Nb+W] of Ti ions, Nb ions and W ions is 14 cations%, the upper limit of the total content [Ti+Nb+W] is 19 cations%, the lower limit of the total content [Ti+Nb+W+Bi] of Ti ions, Nb ions, W ions and Bi ions is 16 cations%, the upper limit of the total content [Ti+Nb+W+Bi] is 19 cations%, The lower limit of the cation ratio [(Ti + Nb + W + Bi) / (P 5+ + B 3+ + Si 4+ )] is 0.42, Li + and Na + The upper limit for the total content of Li + and Na + is 47 cations %. The lower limit of the total content of [Li + +Na + ] is 35 cation %, Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ The upper limit of the total content of Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ [ Mg 2+ + Ca 2+ + Sr 2+ + Ba 2+ ] is 18 cations %.

17. The oxide glass according to claim 13, wherein the lower limit of the total content [Ti+Nb+W] of Ti ions, Nb ions and W ions is 16 cations%, the upper limit of the total content [Ti+Nb+W] is 18 cations%, The lower limit of the total content of [Li + +Na + ] is 40 cation %, Mg 2+ Ca 2+ 、Sr 2+ And Ba 2+ Total content [Mg 2+ +Ca 2+ +Sr 2+ +Ba 2+ The upper limit is 15 cations.

18. The oxide glass according to claim 13, wherein Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ . The upper limit of the total content of Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ is 10 cation %.

19. The oxide glass according to claim 13, wherein Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ . The upper limit of the total content of Mg 2+ , Ca 2+ , Sr 2+ , and Ba 2+ is 5 cations %.

20. The oxide glass according to claim 1, wherein P 5+ Nb ions, Li + Bi ions, Ba 2+ Zr 4+ B 3+ Si 4+ Al 3+ Ti ions, W ions, Ta 5+ Na + K + Rb + Cs + Mg 2+ Ca 2+ Sr 2+ Zn 2+ Ga 3+ In 3+ Sc 3+ Hf 4+ Lu 3+ Ge 4+ La 3+ Gd 3+ Y 3+ and Yb 3+ The lower limit of the total content of the cations is 95%.

21. The oxide glass according to claim 20, wherein P 5+ Nb ion, Li + Bi ion, Ba 2+ Zr 4+ B 3+ Si 4+ Al 3+ Ti ion, W ion, Ta 5+ Na + K + Rb + Cs + Mg 2+ Ca 2+ Sr 2+ Zn 2+ Ga 3+ In 3+ Sc 3+ Hf 4+ Lu 3+ Ge 4+ La 3+ Gd 3+ Y 3+ and Yb 3+ The lower limit of the total content of the 98 cations %.

22. The oxide glass according to claim 20, wherein P 5+ Nb ions, Li + Bi ions, Ba 2+ Zr 4+ B 3+ Si 4+ Al 3+ Ti ions, W ions, Ta 5+ Na + K + Rb + Cs + Mg 2+ Ca 2+ Sr 2+ Zn 2+ Ga 3+ In 3+ Sc 3+ Hf 4+ Lu 3+ Ge 4+ La 3+ Gd 3+ Y 3+ and Yb 3+ The lower limit of the total content of the 99 cations % of the cations.

23. The oxide glass according to claim 20, wherein P 5+ Nb ion, Li + Bi ion, Ba 2+ Zr 4+ B 3+ Si 4+ Al 3+ Ti ion, W ion, Ta 5+ Na + K + Rb + Cs + Mg 2+ Ca 2+ Sr 2+ Zn 2+ Ga 3+ In 3+ Sc 3+ Hf 4+ Lu 3+ Ge 4+ La 3+ Gd 3+ Y 3+ and Yb 3+ The lower limit of the total content of the cations is 99.5%.

24. The oxide glass according to claim 1, wherein Pb, As, Cd, Tl, Be, Se, U, Th, Ra are not contained as glass components.

25. The oxide glass according to claim 1, which the lower limit of the refractive index nd is 1.68, the upper limit of the refractive index nd is 1.78, the lower limit of the Abbe number vd is 24, the upper limit of the Abbe number vd is 35, the upper limit of the glass transition temperature Tg is 530°C, the lower limit of the glass transition temperature Tg is 400°C, the upper limit of the yield temperature Ts is 600°C, the lower limit of the yield temperature Ts is 400°C, the specific gravity is 3.5 or less.

26. The oxide glass according to claim 25, wherein the lower limit of the refractive index nd is 1.70, the upper limit of the refractive index nd is 1.76, the lower limit of the Abbe number vd is 25, the upper limit of the Abbe number vd is 32, the upper limit of the glass transition temperature Tg is 500°C, the lower limit of the glass transition temperature Tg is 440°C, the upper limit of the yield temperature Ts is 570°C, the lower limit of the yield temperature Ts is 460°C, the specific gravity is 3.4 or less.

27. The oxide glass according to claim 25, wherein the lower limit of the refractive index nd is 1.72, the lower limit of the Abbe number vd is 26, the upper limit of the glass transition temperature Tg is 480°C, the upper limit of the yield temperature Ts is 550°C, the specific gravity is 3.3 or less.

28. The oxide glass according to claim 25, wherein the lower limit of the refractive index nd is 1.73, the lower limit of the Abbe number vd is 28, the upper limit of the glass transition temperature Tg is 460°C, the upper limit of the yield temperature Ts is 530°C, the specific gravity is 3.2 or less.

29. The oxide glass according to claim 25, wherein the lower limit of the Abbe number vd is 29.

30. The oxide glass according to claim 1, wherein the internal transmittance at a wavelength of 380 nm, converted to a thickness of 1.0 mm, is 96% or more.

31. The oxide glass according to claim 30, wherein the internal transmittance at a wavelength of 380 nm, converted to a thickness of 1.0 mm, is 96.5% or more.

32. The oxide glass according to claim 30, wherein the internal transmittance at a wavelength of 380 nm, converted to a thickness of 1.0 mm, is 97% or more.

33. The oxide glass according to claim 30, wherein the internal transmittance at a wavelength of 380 nm, converted to a thickness of 1.0 mm, is 98% or more.

34. The oxide glass according to claim 1, wherein the minimum value of the internal transmittance for light in the wavelength range of 380 to 1100 nm, converted to a thickness of 1.0 mm, is 97% or more.

35. The oxide glass according to claim 34, wherein the minimum value of the internal transmittance for light in the wavelength range of 380 to 1100 nm, converted to a thickness of 1.0 mm, is 98% or more.

36. The oxide glass according to claim 34, wherein the minimum value of the internal transmittance for light in the wavelength range of 380 to 1100 nm, converted to a thickness of 1.0 mm, is 99% or more.

37. The oxide glass according to claim 34, wherein the minimum value of the internal transmittance for light in the wavelength range of 380 to 1100 nm, converted to a thickness of 1.0 mm, is 99.5% or more.

38. An optical member comprising the oxide glass according to any one of claims 1 to 37.

39. The optical member according to claim 38, comprising an oxide glass having a specific gravity of 3.5 or less, The optical member integrally has a light-transmitting portion having an internal transmittance of 96% or more at a wavelength of 380 nm when converted to a thickness of 1.0 mm, and a light-blocking portion having an optical density OD of 0.5 or more at a wavelength of 1100 nm, The glass composition of the light-transmitting portion and the light-blocking portion is the same.

40. The optical member according to claim 38, which is a cover glass that shields light obliquely incident to a light-receiving surface of an image sensor, The optical member has a light-blocking portion having a maximum value of external transmittance of 20% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

41. The optical member according to claim 40, wherein The optical member has a light-blocking portion having a maximum value of external transmittance of 15% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

42. The optical member according to claim 40, wherein The optical member has a light-blocking portion having a maximum value of external transmittance of 8% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

43. The optical member according to claim 40, wherein The optical member has a light-blocking portion having a maximum value of external transmittance of 5% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

44. The optical member according to claim 38, which has a light-blocking portion having an optical density OD of 0.5 or more at a wavelength of 1100 nm.

45. The optical member according to claim 44, wherein the light-blocking portion has an optical density OD of 0.8 or more at a wavelength of 1100 nm.

46. The optical member according to claim 44, wherein the light-blocking portion has an optical density OD of 1.0 or more at a wavelength of 1100 nm.

47. The optical member according to claim 44, wherein the light-blocking portion has an optical density OD of 1.3 or more at a wavelength of 1100 nm.

48. The optical member according to claim 38, which is plate-shaped and has a light-blocking portion patterned into an arbitrary shape on one or both surfaces.

49. The optical member according to claim 38, which is plate-shaped and has a light-blocking portion surrounding a light-transmitting portion, which is an uncolored portion, in a central portion in a plan view.

50. The optical member according to claim 38, which is a cover glass mounted on a front surface of a package that houses a solid-state imaging device and used as a light-transmitting window while protecting the solid-state imaging device.

51. The optical member according to claim 38, which is plate-shaped and has a light-blocking portion surrounding a light-transmitting portion, which is an uncolored portion, in a central portion in a plan view, and a glass edge portion is a light-transmitting portion.

52. The optical member according to claim 38, which is plate-shaped and has a light-blocking portion on a side surface.

53. The optical member according to claim 38, which is plate-shaped and has a thickness of 1 mm or less, The light-blocking portion has a thickness of 1 to 300 μm in a glass cross section.

54. The optical member according to claim 53, which has a thickness of 0.7 mm or less, The light-shielding portion has a thickness of 20 to 200 μm in the glass profile.

55. The optical element according to claim 53, having a thickness of 0.7 mm or less, The light-shielding portion has a thickness of 30 to 150 μm in the glass profile.

56. An optical element integrally provided with a light-transmitting portion and a light-shielding portion having a transmittance of visible light lower than that of the light-transmitting portion, The optical element comprises an oxide glass comprising P 5+ , Nb ions, Bi ions and Li + As a glass component, Li + the content of Li is 35-60 cation %, P 5+ the content of the cationic is 27~43%, The total content of Ti ions, Nb ions, W ions, and Bi ions relative to P 5+ B 3+ and Si 4+ The total content of cation ratio [(Ti+Nb+W+Bi) / (P] 5+ +B 3+ +Si 4+ The value is below 0.

7. The total content of Ti ions and W ions is 4 cation% or less, The oxide glass satisfies one or more of the following (i) and (ii): (i) Nb ions and Li + 50 cation % or more, (ii) Li + content relative to Li + , Na + , and K + . The cation ratio [Li + / (Li + + Na + + K + )] is 0.7 or more.

57. The optical element according to claim 56, comprising an oxide glass having a specific gravity of 3.5 or less, The optical element integrally has a light-transmitting portion having an internal transmittance of 96% or more at a wavelength of 380 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having an optical density OD of 0.5 or more at a wavelength of 1100 nm, The glass composition of the light-transmitting portion and the light-shielding portion is the same.

58. The optical element according to claim 56, having a light-transmitting portion having a minimum value of an internal transmittance of 96% or more for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having a maximum value of an external transmittance of 20% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

59. The optical element according to claim 58, having a light-transmitting portion having a minimum value of an internal transmittance of 96.5% or more for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having a maximum value of an external transmittance of 15% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

60. The optical element according to claim 58, having a light-transmitting portion having a minimum value of an internal transmittance of 97% or more for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having a maximum value of an external transmittance of 8% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

61. The optical element according to claim 58, having a light-transmitting portion having a minimum value of an internal transmittance of 98% or more for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm, and a light-shielding portion having a maximum value of an external transmittance of 5% or less for light in a wavelength range of 380 to 1100 nm when converted to a thickness of 1.0 mm.

62. The optical element according to claim 56, wherein The light-shielding portion is a portion in which the glass itself is colored, and the glass composition of the light-transmitting portion and the light-shielding portion is the same.

63. The optical element according to claim 56, wherein O 2- 80% or more, P 5+ The upper limit for its content is 40% cationic. The lower limit of the content of Nb ions is 10 cation%, The upper limit of the content of Nb ions is 21 cation%, The content of Bi ions exceeds 0 cation%, The upper limit of the content of Bi ions is 6 cation%, Li + the lower limit of the content of the cationic group is 40 cation %, Li + the upper limit of the content of the cation is 55%, Nb ions and Li + The lower limit of the total content of Li and Nb ions is 52 cation %. Nb ions and Li + The upper limit of the total content of Li and Nb ions is 75 cation %, the lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.8, Ba 2+ the upper limit of the content of the cation is 5%, Zr 4+ the upper limit of the content of the Zr cation is 2 cation %, The upper limit of the total content of Ti ions and W ions is 3 cation%.

64. The optical element according to claim 63, wherein P 5+ the upper limit of the content of the cationic group is 37 cation %, The lower limit of the content of Nb ions is 11 cation%, the upper limit of the content of Bi ions is 5 cations %, the lower limit of the content of Bi ions is 0.2 cations %, the upper limit of the content of Bi ions is 5 cations %, Li + the upper limit of the content of the cation is 50%, Nb ions and Li + the lower limit of the total content of the cations being 54 cation %, Nb ions and Li + The upper limit of the total content of the cations is 70 cation %, the lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.9, Ba 2+ the upper limit of the content of the Ba2+ cation is 4 cation %, Zr 4+ the upper limit of the content of the cation is 1.5 cation %, the upper limit of the total content of Ti ions and W ions is 2 cations %.

65. The optical element according to claim 63, wherein P 5+ the upper limit of the content of the cationic group is 34 cation %, the lower limit of the content of Bi ions is 0.3 cations %, the upper limit of the content of Bi ions is 4 cations %, the lower limit of the content of Bi ions is 0.3 cations %, the upper limit of the content of Bi ions is 4 cations %, Li + the upper limit of the content of Li is 47 cation %, Nb ions and Li + the lower limit of the total content of Li and Na being 57 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 66 cation %, The lower limit of the cation ratio [Li + / (Li + + Na + + K + ) is 1, Ba 2+ the upper limit of the content of the Ba cation is 3 cation %, Zr 4+ the upper limit of the content of the Zr cation is 1 cation %, the upper limit of the total content of Ti ions and W ions is 1 cation %.

66. The optical element according to claim 63, wherein P 5+ the upper limit of the content of the cationic species being 32 cationic %, the lower limit of the content of Bi ions is 0.5 cations %, the upper limit of the content of Bi ions is 2 cations %, the lower limit of the content of Bi ions is 0.5 cations %, the upper limit of the content of Bi ions is 2 cations %, Nb ions and Li + the upper limit of the total content of the 63 cations being 63 Ba 2+ the upper limit of the content of the 2 cation is 2%, Zr 4+ The upper limit of the content of the cation is 0.5%.

67. The optical element according to claim 63, wherein the lower limit of the content of Bi ions is 0.5 cations %, the upper limit of the content of Bi ions is 1 cation %.

68. The optical element according to claim 56, which has a specific gravity of 3.4 or less, the internal transmittance of the light-transmitting portion at a wavelength of 380 nm is 96.5% or more when converted to a thickness of 1.0 mm, Ba 2+ The upper limit of the content of the 1 cation is 1%. the optical density OD of the light-blocking portion at a wavelength of 1100 nm is 0.8 or more, the optical density OD of the light-transmitting portion at a wavelength of 1100 nm is 0.15 or less, the glass composition of the light-transmitting portion and the light-blocking portion is the same.

69. The optical element according to claim 68, which has a specific gravity of 3.3 or less, the internal transmittance of the light-transmitting portion at a wavelength of 380 nm is 97% or more when converted to a thickness of 1.0 mm, the optical density OD of the light-blocking portion at a wavelength of 1100 nm is 1.0 or more, the optical density OD of the light-transmitting portion at a wavelength of 1100 nm is 0.1 or less.

70. The optical element according to claim 68, which has a specific gravity of 3.2 or less, the internal transmittance of the light-transmitting portion at a wavelength of 380 nm is 98% or more when converted to a thickness of 1.0 mm, the optical density OD of the light-blocking portion at a wavelength of 1100 nm is 1.3 or more. the lower limit of the content of Bi ions is 0.5 cations %, the upper limit of the content of Bi ions is 2 cations %, 71. The optical element of claim 56, comprising an oxide glass comprising P 5+ , Nb ions, Bi ions, and Li + as glass components, and comprising 80% or more of O 2- , P 5+ The upper limit for its content is 40% cationic. the content of Bi ions exceeds 0 cations %, the upper limit of the content of Bi ions is 6 cations %, Li + the lower limit of the content of the cationic group is 40%, Li + the upper limit of the content of the cationic Li is 55%, Nb ions and Li + The lower limit of the total content of Li and Nb ions is 48 cation %. Nb ions and Li + The upper limit of the total content of Li and Nb ions is 75 cation %, the upper limit of the total content of Ti ions and W ions is 3 cations %.

72. The optical element according to claim 71, wherein Ba 2+ the upper limit of the content of the cation is 5%, Zr 4+ the upper limit of the content of the Zr cation is 2 cation %, the lower limit of the content of Bi ions is 0.5 cations %, The lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.

8. the upper limit of the content of Bi ions is 2 cations %, P 5+ the upper limit of the content of the cationic groups is 37 cationic %, the lower limit of the content of Bi ions is 0.2 cations %, the upper limit of the content of Bi ions is 5 cations %, Li + the upper limit of the content of the cation is 50%, Nb ions and Li + the lower limit of the total content of the cations being 50 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 70 cation %, the upper limit of the total content of Ti ions and W ions is 2 cations %.

73. The optical element according to claim 71, wherein Ba 2+ the upper limit of the content of the Ba2+ cation is 4 cation %, Zr 4+ the upper limit of the content of the cation is 1.5 cation %, the lower limit of the content of Bi ions is 0.5 cations %, The lower limit of the ratio of cations [Li + / (Li + + Na + + K + ) is 0.

9. the upper limit of the content of Bi ions is 2 cations %. P 5+ the upper limit of the content of the cationic species is 34 cationic %, ​ ​ Li + the upper limit of the content of Li is 47 cation %, Nb ions and Li + the lower limit of the total content of Li and Na cations is 52 cation %, Nb ions and Li + The upper limit of the total content of Li and Nb ions is 66 cation %, the lower limit of the content of Bi ions is 0.3 cation%, the upper limit of the content of Bi ions is 4 cation%, Ba 2+ the upper limit of the content of the Ba cation is 3 cation %, Zr 4+ the upper limit of the content of the Zr cation is 1 cation %, the upper limit of the total content of Ti ions and W ions is 1 cation%.

74. The optical element according to claim 71, wherein P 5+ the upper limit of the content of the cationic species is 32 cationic %, the lower limit of the content of Nb ions is 14 cation%, the upper limit of the content of Nb ions is 19 cation%, Nb ions and Li + the lower limit of the total content of the cations being 54 cation %, Nb ions and Li + the upper limit of the total content of Li and Na being 63 cation %, the lower limit of the content of Bi ions is 0.4 cation%, the upper limit of the content of Bi ions is 2 cation%, Ba 2+ the upper limit of the content of the 2 cation is 2%, Zr 4+ The upper limit of the content of the cation is 0.5%.

75. The optical element according to claim 71, wherein the lower limit of the content of Nb ions is 16 cation%, the upper limit of the content of Nb ions is 18 cation%, Nb ions and Li + the lower limit of the total content of Li and Na is 57 cation %, the lower limit of the content of Bi ions is 0.5 cation%, the upper limit of the content of Bi ions is 1 cation%, Ba 2+ The upper limit of the content of the 1 cation is 1%.

76. The optical element according to any one of claims 38 to 75, which is a cover glass.

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