Optical element, optical instrument, imaging device, and method for manufacturing an optical element

Abstract

To provide an optical element that has both excellent appearance quality and excellent environmental durability.SOLUTION: An optical element comprises: a glass substrate that has a first surface and a second surface opposite to the first surface; a resin part that is provided on the first surface; and a light shielding film that covers at least part of a side face of the glass substrate and part of the first surface. The second surface is a light incident surface or a light emission surface. The light shielding film is partially provided between the glass substrate and the resin part. The coefficient of linear expansion of the light shielding film is between the coefficient of linear expansion of the glass substrate and the coefficient of linear expansion of the resin part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an optical element, an optical device, an imaging apparatus, and a method for manufacturing an optical element.

Background Art

[0002] As one of optical elements, a lens in which a cured product of a resin composition is provided on a transparent substrate such as glass is known. Such a lens is manufactured by using a molding die, providing a resin composition between the substrate and the molding die, and polymerizing or copolymerizing to form a cured product of a desired shape on the surface of the substrate. A lens manufactured by such a manufacturing method is called a replica element. Conventionally, for the purpose of improving the appearance quality of a replica element, a method of reducing internal reflection due to unnecessary light by forming a light-shielding film on the flange portion of the lens is known. Patent Document 1 discloses, as an example of a replica element, an aspherical lens molded such that the outermost peripheral end face of a cured product of a resin composition is covered with a light-shielding film.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, although the optical element disclosed in Patent Document 1 has excellent appearance quality, cracks may occur in the resin when it is used in a low-temperature environment, and there are problems with the environmental durability of the lens. An object of the present invention is to provide an optical element having excellent appearance quality and excellent environmental durability, and a method for manufacturing the optical element.

Means for Solving the Problems

[0005] An optical element according to one aspect of the present invention comprises a glass substrate having a first surface and a second surface facing the first surface, a resin portion provided on the first surface, and a light-shielding film covering at least a portion of the side surface of the glass substrate and a portion of the first surface, wherein the second surface is the incident or outgoing surface of light, a portion of the light-shielding film is provided between the glass substrate and the resin portion, and the coefficient of linear expansion of the light-shielding film is between the coefficient of linear expansion of the glass substrate and the coefficient of linear expansion of the resin portion.

[0006] A method for manufacturing an optical element according to another aspect of the present invention is a method for manufacturing an optical element having a glass substrate having a first surface and a second surface facing the first surface, and a resin portion provided on the first surface, wherein the second surface is a light incident surface or an exit surface, comprising: a preparation step of preparing the glass substrate on which a light-shielding film is formed; a filling step of filling a resin composition between the glass substrate and a mold; a curing step of curing the resin composition to form the resin portion; and a release step of releasing the resin portion from the mold, wherein the light-shielding film is formed on the glass substrate so as to cover at least a part of the side surface of the glass substrate and a part of the first surface, and the filling step includes filling the resin composition so that a part of the resin composition is filled between the light-shielding film and the mold. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an optical element that combines excellent appearance quality and excellent environmental durability, as well as a method for manufacturing the optical element. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing an optical element according to the first embodiment of the present invention. [Figure 2] This is a schematic diagram showing an optical element according to another embodiment of the present invention. [Figure 3] This is a schematic diagram showing an optical element according to another embodiment of the present invention. [Figure 4] This is a schematic diagram showing a method for manufacturing an optical element according to the first embodiment of the present invention. [Figure 5] This is a schematic diagram showing an imaging device according to a second embodiment of the present invention. [Modes for carrying out the invention]

[0009] [First Embodiment] An optical element and a method for manufacturing the optical element according to the first embodiment of the present invention will be described with reference to Figure 1.

[0010] First, the configuration of the optical element according to this embodiment will be explained using Figure 1. Figure 1 is a schematic diagram showing the configuration of the optical element 10 according to this embodiment. Figure 1(a) is a plan view showing the optical element 10. Figure 1(b) is a cross-sectional view in the thickness direction along line AA' in Figure 1(a). Figure 1(c) is a cross-sectional view showing an enlarged portion of the optical element 10.

[0011] The optical element 10 according to this embodiment is a type of optical element called a replica lens. As shown in Figure 1, the optical element 10 according to this embodiment has a transparent glass substrate 1 and a resin part 2 which is a cured resin composition formed on the glass substrate 1. The resin part 2 is in close contact with the first surface 1A of the glass substrate 1. The thickness of the resin part 2 in the optical axis direction O is not uniform in the radial direction of the optical element 10, but has a non-uniform distribution within the plane. As a result, the surface of the resin part 2 is given an aspherical shape.

[0012] Since the optical element 10 according to this embodiment is constructed as an aspherical lens using a resin part 2, it can be manufactured at a higher cycle rate compared to an aspherical lens made only of glass. Therefore, according to this embodiment, an aspherical lens can be manufactured at a low cost.

[0013] The optical element 10 also includes a light-shielding film 3 that covers at least a portion of the side surface 1F and a portion of the outermost periphery of the first surface 1A of the glass substrate 1. The light-shielding film 3 is formed in close contact with the glass substrate 1. The glass substrate 1 has a first surface 1A consisting of a spherical optical surface 1C and a flat surface 1D, and a second surface 1B opposite the first surface 1A. The optical surface 1C is concave spherical, and the second surface 1B is convex spherical. The flat surface 1D is provided so as to surround the optical surface 1C via a ridge line 1E and connect to the optical surface 1C. That is, the first surface 1A has the optical surface 1C, the flat surface 1D provided on the outer edge of the optical surface 1C, and the ridge line 1E which is the boundary line between the optical surface 1C and the flat surface 1D. The second surface 1B is either the incident surface or the outgoing surface of light in the optical element 10. Also, of the two optical surfaces of the resin part 2, the surface opposite to the surface in contact with the first surface 1A is the other of the incident surface or the outgoing surface of light in the optical element 10. Note that the first surface 1A and the surface of the resin part 2 in contact with the first surface 1A are the refractive surfaces of light in the optical element 10. In other words, the surface of the resin part 2 of the optical element 10 is open to the outside air, and no other optical elements are provided on the surface of the resin part 2.

[0014] Preferably, the resin portion 2 is provided so as shown in Figure 1 that it extends from the optical surface 1C across the ridge line 1E to a part of the flat surface 1D. In this case, the end portion 2A of the resin portion 2 is provided on the flat surface 1D.

[0015] A portion of the light-shielding film 3 is provided between the resin part 2 and the glass substrate 1 at the outermost periphery of the resin part 2. This allows the light-shielding film 3 to block the bright lines that are diffusely reflected by internal reflection of unwanted light taken in from the outermost side surface of the resin part 2 when viewed from the second surface 1B side of the glass substrate 1, thereby improving the appearance quality. Furthermore, in this invention, the coefficient of linear expansion of the light-shielding film 3 is between the coefficient of linear expansion of the glass substrate 1 and the coefficient of linear expansion of the resin part 2. This allows the light-shielding film 3 to mitigate the thermal stress caused by the difference in the coefficients of linear expansion between the resin part 2 and the glass substrate 1 when a thermal shock occurs that causes the optical element 10 to cool rapidly, resulting in an optical element 10 with excellent long-term environmental durability.

[0016] In the optical element 10 shown in FIG. 1, the thickness of the resin part 2 having an aspherical shape is the maximum thickness that is thicker than the thickness at the center P0 at a point P1 located between the center P0, which is the center of the spherical optical surface 1C, and the end. Here, the thickness of the resin part 2 refers to the thickness in the optical axis direction O with respect to the spherical optical surface 1C of the glass substrate 1. In the present invention, the thickness of the resin part 2 at a certain point Px in the radial direction of the optical surface 1C is the average value of the thicknesses measured at three points: the point Px, and two adjacent points Px - 1 and Px + 1 that are 0.5 mm apart from the point Px in the radial direction of the optical surface 1C. Here, the point Px - 1 is a point located closer to the center P0 than the point Px, and the point Px + 1 is a point located closer to the outer periphery of the optical surface 1C than the point Px. By molding the resin part 2 in such a shape, the optical element 10, which is a replica lens, is configured as an aspherical lens having an aspherical shape.

[0017] It is preferable that the optical element 10 satisfies at least one of the following two conditions. One is that the ratio of the maximum thickness in the optical axis direction O of the resin part 2 to the thickness in the optical axis direction O of the resin part 2 at the center position P0 of the optical surface 1C is 5 or more. The optical element 10 in which the ratio of the thickness of the resin part 2 at the point P1 to the thickness of the resin part 2 at the center position of the optical surface 1C is 5 or more has a large aspherical amount, and thus has optical characteristics that can be suitably used as the front lens of a wide-angle zoom lens.

[0018] The other condition is that the ratio of the minimum thickness in the optical axis direction O of the resin part 2 to the thickness in the optical axis direction O of the resin part 2 at the center position of the optical surface 1C is 1 / 5 or less. The optical element 10 that satisfies this condition also becomes a lens with a large aspherical amount, so that the correction of distortion and chromatic aberration becomes more effective. Therefore, by using the optical element 10 that satisfies this condition, excellent image quality can be obtained in a wide-angle lens, a telephoto lens, etc., where a particularly wide field of view is required.

[0019] On the other hand, in a replica lens with a large aspherical amount, due to the influence of increased residual stress during molding, cracks are likely to occur in the resin part 2 due to stress caused by thermal shock. This is because if the thickness of the resin part 2 is too thick, the thermal stress increases according to the thickness, and as a result, the probability of the resin part cracking increases. In particular, in the resin part 2 formed on the ridge line 1E, stress concentration due to thermal shock is likely to occur, so it is preferable to interpose the light-shielding film 3 as a stress relaxation layer on the ridge line 1E. That is, as shown in FIG. 1, it is preferable that the light-shielding film 3 is provided so as to spread from the flat surface 1D across the ridge line 1E to a part of the optical surface 1C. Thereby, it is also possible to effectively block the bright line with the light-shielding film 3. At this time, the end 3A of the light-shielding film 3 provided on the first surface 1A is in a state provided on the optical surface 1C. However, the configurations of the resin part 2 and the light-shielding film 3 in the present invention are not limited to the example shown in FIG. 1. For example, as shown in FIG. 2, the light-shielding film 3 may be provided only on at least a part of the flat surface 1D without straddling the ridge line 1E. Even in this case, by interposing the light-shielding film 3 having an appropriate linear expansion coefficient between the glass substrate 1 and the resin part 2 at the end of the resin part 2, cracking of the resin part 2 can be suppressed.

[0020] Also, for example, as shown in FIG. 3, the resin part 2 may have the outermost periphery on the optical surface 1C without straddling the ridge line 1E, and the resin part 2 may not be provided on the flat surface 1D. In this case, the light-shielding film 3 is continuously formed from the flat surface 1D across the ridge line 1E to the optical surface 1C. At the outermost periphery of the resin part 2, as in the example shown in FIG. 2, it is important to interpose the light-shielding film 3 having an appropriate linear expansion coefficient between the glass substrate 1 and the resin part 2. In short, in the present invention, the outermost periphery of the resin part 2 may be on either the optical surface 1C or the flat surface 1D. At the outermost periphery of the resin part 2, it is an essential configuration to interpose the light-shielding film 3 having an appropriate linear expansion coefficient between the glass substrate 1 and the resin part 2. Thereby, the appearance quality of the optical element 10 can be improved, and furthermore, cracking of the resin part 2 due to thermal stress relaxation can be suppressed.

[0021] In the optical element 10 according to this embodiment, the width of the laminated region R, which is the region where the resin portion 2 and the light-shielding film 3 are laminated, in the direction perpendicular to the optical axis direction O is preferably 1% or more and 10% or less, when the radius r of the optical surface 1C is taken as 100%. Here, the radius r of the optical surface 1C is the distance from the center P0 of the optical surface 1C to the edge line 1E in the direction perpendicular to the optical axis direction O. If the ratio of the width of the laminated region R to the radius r of the optical surface 1C is 1% or more, bright lines can be suppressed even when the half-opening angle of the optical element 10 is large, and a deterioration in appearance quality can be suppressed. In addition, a larger width of the laminated region R allows the light-shielding film 3 to function effectively as a stress-relieving layer. Furthermore, by having a ratio of the width of the laminated region R to the radius r of the optical surface 1C of 10% or less, it is possible to avoid unnecessarily increasing the outer diameter of the lens.

[0022] In this invention, there are no particular limitations on the coefficient of linear expansion of the resin part 2. However, if the coefficient of linear expansion of the resin part 2 is 50 ppm / K or higher, it will be a value that is far from the coefficient of linear expansion of the glass substrate 1, resulting in higher thermal stress. On the other hand, the high toughness of the resin part 2 makes it less likely for cracks to occur. Furthermore, if the coefficient of linear expansion of the resin part 2 is 150 ppm / K or lower, the difference with the coefficient of linear expansion of the glass substrate 1 will not become too large, and excessive thermal stress can be suppressed. Therefore, it is preferable that the coefficient of linear expansion of the resin part 2 is between 50 ppm / K and 150 ppm / K. Here, the coefficient of linear expansion is a value measured using thermomechanical analysis (TMA) or the like in the room temperature range of -30°C to 70°C.

[0023] Unlike bonded lenses, the surface of the replica lens opposite to the side of the resin part 2 that contacts the glass substrate 1 is exposed to the atmosphere. Therefore, the resin part 2 absorbs moisture from the air and expands. Due to the expansion of the resin part 2, residual stress is generated in the replica lens, and there is a possibility that the resin part 2 may crack when a sudden thermal shock occurs. For this reason, the water absorption expansion rate of the resin part 2 of the optical element 10 according to this embodiment is preferably 0.8% or less. By doing so, the water absorption expansion of the resin part 2 can be suppressed, and the cracking of the resin part 2 can be further suppressed. The water absorption expansion rate of the resin part 2 is more preferably 0.5% or less. As described above, by interposing a light-shielding film 3 having an appropriate coefficient of thermal expansion between the resin part 2 and the glass substrate 1 at the outermost periphery of the resin part 2, the optical element 10 can possess both excellent appearance quality and environmental durability.

[0024] As the glass substrate 1, a transparent glass can be used. In this specification, "transparent" means that the transmittance of light in the wavelength range of 400 nm to 780 nm is 10% or more. Specifically, as the glass substrate 1, examples include general optical glass such as silicate glass, borosilicate glass, and phosphate glass, as well as quartz glass, glass ceramics, and the like. Although Figure 1 shows a case where the optical surface 1C is concave spherical and the second surface 1B is convex spherical, the shape of the glass substrate 1 is not particularly limited. The shape of the optical surface 1C on the first surface 1A, which is the surface of the glass substrate 1 that contacts the resin part 2, can be appropriately selected from concave spherical, convex spherical, axisymmetric aspherical, and planar surfaces according to desired characteristics.

[0025] The glass substrate 1 preferably has a circular planar shape when viewed from above in a direction along the optical axis of the optical element 10 passing through the center P0 of the optical surface 1C, which is the center of the lens, as shown in Figure 1(a). Having a circular planar shape for the glass substrate 1 improves the accuracy of assembling the optical element 10 when using the optical element 10 as a lens in an optical system, as will be described later.

[0026] In this embodiment, the resin portion 2 is provided in close contact with the glass substrate 1 or the light-shielding film 3 on the optical surface 1C of the glass substrate 1 and on a part of the flat surface 1D that spans the edge line 1E. The surface of the resin portion 2 has an aspherical shape. The resin portion 2 has a coefficient of linear expansion different from that of the glass substrate 1. The resin composition 2a for forming the resin portion 2 (see Figure 4(a)) is a polymerizable composition and is preferably an energy-curable composition suitable for molding using a mold. An energy-curable composition is a composition that contains components that polymerize and harden into a resin by applying either or both light energy and / or thermal energy from an uncured state. Among energy-curable compositions, it is more preferable that the resin composition 2a is an ultraviolet-curable resin composition. Examples of ultraviolet-curable materials included in the ultraviolet-curable resin composition include monomers having (meth)acrylate groups and epoxy resins. In this specification, the notation (meth)acrylate means acrylate or methacrylate. In other words, for example, (meth)acrylate group means either an acrylate group or a methacrylate group.

[0027] Since the resin portion 2, which is the cured product of the resin composition 2a, is made of organic material, when combined with the glass substrate 1, the coefficients of linear expansion differ between the glass substrate 1 and the resin portion 2. Therefore, when a temperature change occurs in the optical element 10 as described above, thermal stress is mainly generated in the resin portion 2 at the ridge line 1E. However, according to this embodiment, as described above, such thermal stress can be dispersed to suppress or prevent cracking of the resin portion 2 due to thermal stress.

[0028] The resin composition 2a for forming the resin part 2 includes a curable material, and a polymerizable monomer may be used as the curable material. Examples of polymerizable monomers include (meth)acrylate monomers such as methyl methacrylate, ethylene methacrylate, methyl acrylate, ethyl acrylate, and butyl acrylate, as well as ethylene-based unsaturated monomers such as acrylic acid, styrene, butadiene, and divinylbenzene. Furthermore, to facilitate the handling of the resin composition 2a, adjustments may be made to increase the viscosity of the resin composition 2a by using a polymerizable monomer with a high molecular weight in advance as the curable material. In addition, the resin composition 2a may contain other organic or inorganic substances other than the curable material to adjust its optical and mechanical properties. Furthermore, the resin composition 2a may contain a polymerization initiator. The polymerization initiator may be a photopolymerization initiator or a thermal polymerization initiator, and can be determined by the selected manufacturing process. However, when replica molding is performed to form the aspherical shape of the resin part 2, a photopolymerization initiator is preferred from the viewpoint of a fast curing speed.

[0029] Examples of commercially available photopolymerization initiators include 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone, 1-hydroxycyclohexylphenyl ketone, bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide, 4-phenylbenzophenone, 4-phenoxybenzophenone, 4,4′-diphenylbenzophenone, and 4,4′-diphenoxybenzophenone.

[0030] The content of the photopolymerization initiator in the resin composition 2a is preferably in the range of 0.01% by mass or more and 10% by mass or less. If the content of the photopolymerization initiator is 0.01% by mass or more, high reactivity can be obtained, and if it is 10% by mass or less, the decrease in the light transmittance of the cured resin part 2 can be suppressed. Unreacted polymerization initiator remains in the cured resin part 2. Furthermore, the resin composition 2a may optionally contain polymerization inhibitors, antioxidants, light stabilizers (HALS), ultraviolet absorbers, silane coupling agents, mold release agents, pigments, dyes, etc.

[0031] The resin part 2 is preferably highly transparent. Specifically, the resin part 2 is preferably 70% or more in terms of internal transmittance at a wavelength of 400 nm when calculated at a thickness of 500 μm. Furthermore, the Abbe number of the resin part 2 is preferably 50 or more and less than 60. If the transparency and Abbe number of the resin part 2 are within these ranges, various optical designs can be accommodated when the optical element 10 is used as a lens in an optical system.

[0032] The light-shielding film 3 of the optical element 10 according to this embodiment will be described. The light-shielding coating used to form the light-shielding film 3 can be a compound having an epoxy group, inorganic fine particles, a colorant, and an amine-based curing agent, but is not limited to these; any material that absorbs visible light with a wavelength of 400 nm to 700 nm can be used. Examples of such colorants include pigments such as carbon black, titanium black, iron oxide, and copper-iron-manganese composite oxide. When using dyes as colorants, one type may be used, or multiple dyes such as black, red, yellow, and blue may be mixed. Furthermore, the light-shielding paint can use a resin obtained by crosslinking epoxy resin and amine-based cured products. Examples of epoxy resins that can be used include bisphenol A type, bisphenol F type, polyfunctional epoxy resin, flexible epoxy resin, brominated epoxy resin, glycidyl ester type epoxy resin, polymer type epoxy resin, and biphenyl type epoxy resin. One type of epoxy resin may be used alone, or multiple types may be mixed. When epoxy resin is used in the light-shielding paint, the paint may further contain an amine-based curing agent to cure the epoxy group compound. The amine-based curing agent is not particularly limited as long as it satisfies the desired properties, and known amine-based curing agents can be used. Specifically, for example, linear aliphatic, polyamide, alicyclic, aromatic, dicyandiamide, adipic acid dihyazide, etc., can be used as amine-based curing agents. These may be used alone, or multiple types may be mixed. As inorganic nanoparticles, silica nanoparticles, titanium dioxide, zirconium oxide, aluminum oxide, yttrium oxide, cadmium oxide, diamond, strontium titanate, germanium, and other nanoparticles can be used. In this invention, the coefficient of linear expansion of the light-shielding film 3 lies between the coefficient of linear expansion of the glass substrate 1 and the coefficient of linear expansion of the resin portion 2. The coefficient of linear expansion of the light-shielding film 3 can be adjusted mainly by the mixing ratio of the resin contained in the light-shielding film 3 and the inorganic fine particles.

[0033] Next, a method for manufacturing the optical element 10 according to this embodiment will be described with reference to Figure 4. Figure 4 is a cross-sectional view showing the arrangement of each component in the process of forming the resin portion 2 of the optical element 10 shown in Figure 1 on the first surface 1A of the glass substrate 1. Figure 4 shows the arrangement of each component in a cross-section along the lamination direction of the glass substrate 1 and the resin portion 2.

[0034] First, in the preparation step, a glass substrate 1 with a light-shielding film 3 molded onto it and a resin composition 2a for forming the resin part 2 are prepared. Here, in order to improve the adhesion between the glass substrate 1 and the light-shielding film 3 and the resin portion 2 which is a cured product of the resin composition 2a, it is preferable to pre-treat the first surface 1A of the glass substrate 1 and the surface of the light-shielding film 3. If the glass substrate 1 is made of glass, pretreatments such as silane coupling treatment, corona discharge treatment, UV ozone treatment, and plasma treatment can be selected.

[0035] From the viewpoint that adhesion can be further improved by directly chemically bonding the surface forming the resin part 2, such as the first surface 1A, with the resin part 2, it is preferable to perform a coupling treatment using a silane coupling agent as a pretreatment. That is, it is preferable to further have a coating step before the next filling step in which the coupling agent is applied to at least a part of the first surface 1A that is not covered by the light-shielding film 3 and a part of the surface of the light-shielding film 3.

[0036] Specific silane coupling agents include, for example, 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 8-methacryloxyoctyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, and 3-methacryloxypropyltriethoxysilane.

[0037] Next, in the filling process, the resin composition 2a is filled between the glass substrate 1 and the mold 4. Specifically, first, as shown in Figure 4(a), the resin composition 2a is dropped onto the surface of the mold 4. The resin composition 2a is, as described above, a UV-curable resin composition containing, for example, a photopolymerization initiator. The glass substrate 1 is then placed on the ejector 5 and positioned opposite the mold 4. The mold 4 is, for example, a mold that has a desired aspherical inverted shape on its surface and can be manufactured by cutting a metal base material such as stainless steel or steel that has been plated with NiP or oxygen-free copper using a precision machining tool. A release agent may also be applied to the surface of the mold 4 to control the release properties of the resin part 2. The type of release agent is not particularly limited, but for example, a fluorine coating agent can be used as a release agent.

[0038] Next, as shown in Figure 4(b), the ejector 5 is lowered, bringing the mold 4 closer to the glass substrate 1, thereby providing the resin composition 2a to the glass substrate 1. The ejector 5 is lowered further, filling the space between the mold 4 and the glass substrate 1 with uncured resin composition 2a, and molding it into the desired shape.

[0039] In the method for manufacturing an optical element according to the present invention, the filling step includes filling the resin composition 2a such that a portion of the resin composition 2a is filled between the light-shielding film 3 and the mold 4. By doing so, when the resin composition 2a is cured, the light-shielding film 3 can be interposed between the resin part 2 and the glass substrate 1.

[0040] Next, in the curing process, the resin composition 2a is cured to form the resin part 2. Here, an example of curing the resin composition 2a by irradiating it with ultraviolet light will be described. As shown in Figure 4(b), ultraviolet light is irradiated from the second surface 1B of the glass substrate 1 toward the resin composition 2a between the glass substrate 1 and the mold 4 using an ultraviolet light source 6, thereby polymerizing and curing the resin composition 2a. This yields the resin portion 2, which is a polymerized and cured product of the resin composition 2a.

[0041] In this process, the resin composition 2a filled between the light-shielding film 3 and the mold 4 remains uncured because ultraviolet light is blocked by the light-shielding film 3 and does not receive ultraviolet irradiation. Therefore, one method is to make the inner surface of the ejector 5 a mirror surface in order to mold the resin part 2 between the light-shielding film 3 and the mold 4. This allows the ultraviolet light irradiated from the ultraviolet light source 6 to be reflected off the inner surface of the ejector 5 and wrap around between the light-shielding film 3 and the mold 4. As a result, the resin composition 2a between the light-shielding film 3 and the mold 4 can be cured without leaving any uncured areas.

[0042] Another method for curing the resin composition 2a between the light-shielding film 3 and the mold 4 is to use a glass material that allows ultraviolet light to pass through as the material for the mold 4, and to irradiate the glass substrate 1 with ultraviolet light not only from the second surface 1B side but also from the side on which the mold 4 is placed. This makes it possible to cure the resin composition 2a between the light-shielding film 3 and the mold 4.

[0043] The curing step preferably includes irradiating the resin portion 2, which is formed between the light-shielding film 3 and the mold 4 by the curing of the resin composition 2a, with ultraviolet light such that the curing reaction rate is 40% or more and 95% or less. This allows the resin portion 2 to be easily demolded as a cured product in the demolding step described later. Subsequently, in the release process, the polymerized and hardened resin portion 2 is released from the mold 4, thereby obtaining an optical element 10 having an aspherical resin portion 2 formed on a glass substrate 1. Furthermore, after forming the resin part 2, additional irradiation with ultraviolet light or heat treatment may be performed in air or an oxygen-free atmosphere. In particular, if a portion of the resin composition 2a that was between the light-shielding film 3 and the mold 4 remains uncured even after demolding, it is necessary to additionally irradiate with ultraviolet light from the side of the resin part 2 to cure the resin composition 2a that was between the light-shielding film 3 and the mold 4.

[0044] The optical element 10 according to this embodiment can be manufactured by the above manufacturing method. In the filling step, the resin composition 2a may be dropped onto both the mold 4 and the glass substrate 1, or it may be dropped only onto the glass substrate 1. Furthermore, if the resin composition 2a contains a thermal polymerization initiator as a curing initiator, the curing step may include a heat treatment step.

[0045] [Second Embodiment] The optical element 10 according to the first embodiment described above can be applied to various devices and equipment such as optical instruments and imaging devices. In this embodiment, optical instruments and imaging devices will be described as specific application examples of the optical element 10 according to the first embodiment.

[0046] (optical equipment) Specific examples of applications of the optical element 10 according to the first embodiment include lenses that constitute optical equipment (photographic optical systems) for cameras and video cameras, and lenses that constitute optical equipment (projection optical systems) for liquid crystal projectors. It can also be used in pickup lenses for DVD recorders and the like. These optical devices have a housing and an optical system having at least one lens disposed within the housing. The optical device according to this embodiment is characterized in that at least one of these lenses is the optical element 10 according to the first embodiment.

[0047] (Imaging device) The imaging device according to this embodiment comprises a housing, an optical system having at least one lens disposed within the housing, and an image sensor that receives light that has passed through the optical system. The present embodiment is characterized in that at least one of the lenses is the optical element 10 according to the first embodiment.

[0048] Figure 5 is a schematic diagram showing the configuration of a single-lens reflex digital camera 500, which is an example of a preferred embodiment of an imaging device using the optical element 10 according to the first embodiment. In Figure 5, the camera body 502 and the lens barrel 501, which is an optical device, are coupled together, and the lens barrel 501 is a so-called interchangeable lens that can be attached to and detached from the camera body 502. Light from the subject is captured through an optical system consisting of multiple lenses 503, 505, etc., arranged on the optical axis of the imaging optical system within the housing 520 of the lens barrel 501. The optical element 10 according to the first embodiment can be used, for example, as lenses 503 and 505. Here, lens 505 is supported by an inner barrel 504 and is movably supported relative to the outer barrel of the lens barrel 501 for focusing and zooming. During the observation period before shooting, light from the subject is reflected by the main mirror 507 inside the camera body housing 521, passes through the prism 511, and is then projected onto the photographer's viewfinder lens 512. The main mirror 507 is, for example, a half-mirror, and the light that passes through the main mirror is reflected by the sub-mirror 508 towards the AF (autofocus) unit 513, and this reflected light is used, for example, for distance measurement. The main mirror 507 is also attached and supported by the main mirror holder 540 by adhesive or the like. During shooting, the main mirror 507 and sub-mirror 508 are moved out of the optical path via a drive mechanism (not shown), the shutter 509 is opened, and the image sensor 510 receives the light that has entered from the lens barrel 501 and passed through the photographic optical system to form a photographic image. The aperture 506 is configured to change the brightness and depth of field during shooting by changing the aperture area. Although the imaging device was described using a single-lens reflex digital camera, the optical element 10 can also be used in smartphones, compact digital cameras, drones, etc.

[0049] [Examples] The present invention will be described in more detail below using examples. First, the evaluation method for the optical element will be explained. The optical element was evaluated based on its appearance and lens cracking.

[0050] (exterior) The optical elements obtained in each example and comparative example were visually inspected from the second surface, which is the side opposite the resin portion, and the visibility of the emission lines was evaluated. At that time, levels were ranked as follows: A for levels where the emission lines were not visible at all, B for levels where the emission lines were slightly visible but not problematic, and C for levels where the emission lines were clearly visible.

[0051] (Cracked lens) The optical elements obtained in each example and comparative example were placed in a freezer maintained at a temperature of -40°C from room temperature. After 24 hours, the optical elements were removed and returned to room temperature (25°C), and their appearance was evaluated. Furthermore, stress simulations during rapid cooling at -40°C were performed using the finite element method to calculate the thermal stress at the ends of the resin portion, which were presumed to be the crack initiation points. Optical elements were ranked as follows: those without cracks in the resin part and with a stress value of less than 10 MPa at the end of the resin part were ranked as A; those without cracks in the resin part and with a stress value of 10 MPa or more at the end of the resin part were ranked as B; and those with cracks in the resin part were ranked as C.

[0052] Next, the optical elements relating to each embodiment and comparative example will be described. (Example 1) The optical element 10 shown in Figure 1 was manufactured using the manufacturing method shown in Figure 4. The glass substrate 1 is a 44mm diameter optical glass (S-TIM8, manufactured by Ohara Corporation) having a flat surface 1D with a width of 5mm and a ridge line 1E between the flat surface 1D and the optical surface 1C. The glass substrate 1 has a light-shielding film 3 (GT7-II, manufactured by Canon Chemicals). The light-shielding film 3 is formed with an inner diameter of 33mm and is applied across the ridge line 1E to the optical surface 1C. The shape of the glass substrate 1 is such that one surface (optical surface 1C) is a concave spherical shape with a diameter of 34mm, and the other surface (second surface 1B) is a convex spherical shape with a diameter of 44mm. For type 4, a NiP layer plated on a metal base material was cut using a precision machining tool to form a shape that was an inversion of the aspherical shape of the resin part 2 to be molded. The inner surface of ejector 5 was given a mirror finish to reflect ultraviolet rays.

[0053] Next, in order to improve the adhesion between the glass substrate 1 and the resin part 2, a silane coupling agent having a methacrylic group as a functional group was applied to the surface of the glass substrate 1 and the light-shielding film 3.

[0054] Next, resin composition 2a was filled between mold 4 and glass substrate 1. The resin composition 2a used contained an acrylic monomer having a cyclic hydrocarbon as its main chain and reactive acrylate groups at its terminals, and a polymerization initiator (Omnirad 184 (1-hydroxycyclohexyl phenyl ketone), manufactured by IGM Resins). Subsequently, the intensity at a wavelength of 365 nm was 10 mW / cm². 2The resin composition 2a was cured by irradiating the entire surface with ultraviolet light for 200 seconds, and the cured resin composition 2a was released from the mold 4 to form the resin part 2 on the glass substrate 1. The intermediate obtained by releasing the resin was placed in an oven and heated at 80°C for 24 hours to produce the optical element according to Example 1. The width of the lamination region R between the light-shielding film 3 and the resin part 2 in the obtained optical element 10 was measured. The outer diameter of the resin part 2 (distance from the center P0 to the end of the resin part 2 in a direction perpendicular to the optical axis direction O) was 35 mm, and the light-shielding film 3 was interposed in a region of 1 mm at the outermost edge. The ratio of the width of the lamination region R to the radius of the optical surface 1C was 1 mm / 17 mm × 100% = 6%. The coefficients of linear expansion of the glass substrate 1, the light-shielding film 3, and the resin part 2 were measured in the range of -30°C to 70°C using a thermomechanical analyzer TMA (METTLER TOLEDO), and were found to be 8 ppm / K, 60 ppm / K, and 100 ppm / K, respectively.

[0055] The water absorption and expansion rate of resin part 2 was measured as follows. First, to measure the water absorption expansion rate, a resin portion 2 was cut from the surface of a separately prepared optical element 10. Specifically, an incision was made in the resin portion 2 on the surface of the optical element 10 using a feather razor, and the razor was inserted into the adhesive surface between the resin portion 2 and the glass substrate 1 to peel off the film. The thickness distribution of the film within one sample was kept within a 10% variation. The shape of the film was a strip of 10 mm x 1 mm. The water absorption expansion coefficient of the peeled film was measured using the tensile load method with a device that measures the linear expansion coefficient of materials (TMA-4000SE + HC9700 (humidity controlled type), manufactured by NETZSCH Japan), while controlling the temperature and humidity to 60°C and 90%RH. The curing reaction rate of the resin part 2 formed between the light-shielding film 3 and the mold 4 was measured using a Fourier transform infrared spectrometer (FTIR) (product name: Spectrum One, manufactured by PerkinElmer). Specifically, the peak area related to the carbon double bond in the absorption spectrum of the resin part 2 obtained by FTIR was determined and calculated using the following formula.

number

[0056] (Example 2) An optical element 10 according to Example 2 was fabricated in the same manner as in Example 1, except that an acrylic monomer having a linear hydrocarbon as its main chain was used as the material for the resin composition 2a. The coefficient of linear expansion of the resin portion of the optical element 10 according to Example 2 was 170 ppm / K.

[0057] (Example 3) An optical element 10 according to Example 3 was manufactured in the same manner as in Example 1, except that the resin part 2 was formed so that its outer diameter was 33.8 mm. In the optical element 10 according to Example 3, the resin part 2 was formed only on the optical surface 1C without crossing the ridge line 1E, as shown in Figure 3. The width of the laminated region R was 0.4 mm, and the ratio of the width of the laminated region R to the radius of the optical surface 1C was 0.4 mm / 17 mm × 100% = 2%.

[0058] (Example 4) An optical element 10 according to Example 4 was fabricated in the same manner as in Example 1, except that the resin part 2 was formed so that its outer diameter was 33.2 mm. In the optical element 10 according to Example 4, the resin part 2 was formed only on the optical surface 1C without crossing the ridge line 1E, as shown in Figure 3. The width of the laminated region R was 0.1 mm, and the ratio of the width of the laminated region R to the radius of the optical surface 1C was 0.1 mm / 17 mm × 100% = 0.5%.

[0059] (Example 5) An optical element 10 according to Example 5 was fabricated in the same manner as in Example 1, except that a silane coupling agent having a vinyl group was used as the silane coupling agent. In the optical element 10 according to Example 5, a float of the resin part 2 was observed on the flat surface 1D.

[0060] (Example 6) As the resin composition 2a, a mixture of the resin composition 2a used in Example 1 and a resin composition 2a containing an acrylic monomer having urethane as the main chain and the polymerization initiator, in a weight ratio of 80:20, was used. Otherwise, the optical element 10 according to Example 6 was fabricated in the same manner as in Example 1.

[0061] (Example 7) An optical element 10 according to Example 7 was fabricated in the same manner as in Example 1, except that the internal reflection of the ejector was not utilized in the ultraviolet irradiation process. In the optical element 10 according to Example 7, the outer diameter of the resin part 2 was 33.4 mm.

[0062] (Example 8) An optical element 10 according to Example 8 was manufactured in the same manner as in Example 1, except that a quartz glass mold was used in the ultraviolet irradiation process and ultraviolet irradiation was performed simultaneously from above and below. In the optical element 10 according to Example 8, the outer diameter of the resin part 2 was 35.7 mm.

[0063] (Example 9) An optical element 10 according to Example 9 was manufactured in the same manner as in Example 1, except that additional ultraviolet irradiation was performed from the resin part 2 side after demolding. In the optical element 10 according to Example 9, the outer diameter of the resin part 2 was 35.7 mm.

[0064] (Examples 10, 18, 20-22) The optical elements 10 according to Examples 10, 18, and 20-22 were manufactured in the same manner as in Example 1, except that a different mold 4 was used for the shape corresponding to the aspherical shape of the resin part 2 compared to the mold 4 used in Example 1.

[0065] (Example 11) A light-shielding film 3 was formed on a glass substrate 1 using a paint obtained by adding 20 parts by weight of QSG-100 (manufactured by Shin-Etsu Chemical Co., Ltd.) to 100 parts by weight of GT7-II (manufactured by Canon Chemical Co., Ltd.) and stirring until homogeneous. In addition, as the resin composition 2a, a mixture of the resin composition 2a used in Example 1 and a resin composition 2a containing an acrylic monomer having a cyclic hydrocarbon as the main chain and acrylate groups in the side chains and terminals, and the above polymerization initiator, was used in a weight ratio of 50:50. The optical element 10 according to Example 11 was manufactured in the same manner as in Example 1 otherwise.

[0066] (Example 12) As the resin composition 2a, a mixture of the resin composition 2a used in Example 1 and the resin composition 2a used in Example 2 was used in a weight ratio of 30:70. Otherwise, the optical element 10 according to Example 12 was fabricated in the same manner as in Example 1.

[0067] (Example 13) An optical element 10 according to Example 13 was manufactured in the same manner as in Example 1, except that a quartz glass mold was used in the ultraviolet irradiation process and ultraviolet irradiation was performed simultaneously from above and below. In the optical element 10 according to Example 13, the outer diameter of the resin part 2 was 36.4 mm.

[0068] (Example 14) As resin composition 2a, a mixture of resin composition 2a used in Example 1 and resin composition 2a containing an acrylic monomer having a cyclic hydrocarbon as the main chain and acrylate groups in the side chains and terminals, and the polymerization initiator, was used in a weight ratio of 80:20. Otherwise, the optical element 10 according to Example 14 was fabricated in the same manner as in Example 1.

[0069] (Example 15) As the resin composition 2a, a mixture of the resin composition 2a used in Example 1 and the resin composition 2a used in Example 2 was used in a weight ratio of 40:60. Otherwise, the optical element 10 according to Example 15 was fabricated in the same manner as in Example 1.

[0070] (Examples 16, 17, 19) The optical elements 10 according to Examples 16, 17, and 19 were manufactured in the same manner as in Example 4, except that a different mold 4 was used for the shape corresponding to the aspherical shape of the resin part 2 compared to the mold 4 used in Example 4.

[0071] (Example 23) As resin composition 2a, a mixture of resin composition 2a used in Example 1 and resin composition 2a containing an acrylic monomer having urethane as the main chain and the polymerization initiator, in a weight ratio of 70:30, was used. Otherwise, the optical element 10 according to Example 23 was fabricated in the same manner as in Example 1.

[0072] (Comparative Example 1) An optical element according to Comparative Example 1 was manufactured in the same manner as in Example 1, except that a light-shielding film was formed on the side surfaces and a portion of the flat surface of the glass substrate, as well as on the edges of the resin portion, after filling the space between the glass substrate without a light-shielding film and the mold and curing the resin composition. The curing reaction rate was measured at the edge of the resin portion on which the light-shielding film is laminated.

[0073] (Comparative Example 2) An optical element according to Comparative Example 2 was fabricated in the same manner as in Example 1, except that the inner diameter of the light-shielding film was set to 37 mm and there was no laminated region R. The curing reaction rate was measured at the edges of the resin portion.

[0074] (Comparative Example 3) An optical element according to Comparative Example 3 was fabricated in the same manner as in Example 1, except that 50 parts by weight of titanium dioxide (MT-05: manufactured by Teika Co., Ltd.) was added to the paint for forming the light-shielding film, and the resulting paint was used to form a light-shielding film on a glass substrate. The coefficient of linear expansion of the light-shielding film of the optical element according to Comparative Example 3 was 110 ppm / K.

[0075] Table 1 below summarizes the physical properties and evaluation results for each example and the optical element related to its comparability.

[0076] In Table 1, P0 and P1 correspond to the center P0 and point P1 of the optical surface 1C shown in Figure 1, respectively, where the resin portion 2 has its maximum thickness. Point P1 is 13 mm away from the center P0 in the radial direction of the optical surface 1C. The laminated area width ratio in Table 1 indicates the ratio of the width of the area where the resin portion and the light-shielding film are laminated to the radius of the optical surface. Table 1 shows that the optical elements 10 in Examples 1 to 23 are all superior to the optical elements in Comparative Examples 1 to 3.

[0077] [Table 1]

[0078] The disclosure of embodiments of the present invention includes the following configurations and methods. (Composition 1) A glass substrate having a first surface and a second surface facing the first surface, A resin part provided on the first surface, The glass substrate comprises a light-shielding film covering at least a portion of the side surface and a portion of the first surface, The second surface is the incident or outgoing surface of light, A portion of the light-shielding film is provided between the glass substrate and the resin portion. The linear expansion coefficient of the light-shielding film is between the linear expansion coefficient of the glass substrate and the linear expansion coefficient of the resin part. An optical element characterized by the following features. (Configuration 2) The ratio of the maximum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 5 or more, and The ratio of the minimum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 1 / 5 or less. An optical element according to configuration 1, satisfying at least one of the following conditions. (Composition 3) The optical element according to configuration 1 or 2, wherein the coefficient of linear expansion of the resin portion is 50 ppm / K or more and 150 ppm / K or less. (Composition 4) The first surface has an optical surface, a flat surface provided on the outer edge of the optical surface, and a ridge line that forms the boundary line between the optical surface and the flat surface. The resin portion is provided so as to extend from the optical surface across the ridge line to a part of the flat surface, The optical element according to any one of configurations 1 to 3, wherein the light-shielding film is provided so as to extend from the flat surface across the ridge line to a part of the optical surface. (Composition 5) The optical element according to configuration 4, wherein the width of the region where the resin portion and the light-shielding film are laminated, in a direction perpendicular to the optical axis direction, is 1% or more and 10% or less when the radius of the optical surface is taken as 100%. (Composition 6) The optical element according to any one of configurations 1 to 5, wherein the water absorption expansion rate of the resin portion is 0.8% or less. (Composition 7) An optical instrument comprising a housing and an optical system having at least one lens disposed within the housing, An optical device characterized in that at least one of the lenses is an optical element described in any of configurations 1 to 6. (Composition 8) An imaging device comprising a housing, an optical system having at least one lens disposed within the housing, and an image sensor that receives light passing through the optical system, An imaging device characterized in that at least one of the lenses is an optical element described in any of configurations 1 to 6. (Method 1) A method for manufacturing an optical element comprising a glass substrate having a first surface and a second surface facing the first surface, and a resin portion provided on the first surface, wherein the second surface is either an incident surface or an outgoing surface for light, A preparation step of preparing the glass substrate on which the light-shielding film is formed, A filling step of filling the glass substrate and the mold with a resin composition, A curing step in which the resin composition is cured to form the resin part, A mold release step for releasing the resin part, It has, The light-shielding film is formed on the glass substrate so as to cover at least a portion of the side surface and a portion of the first surface of the glass substrate. A method for manufacturing an optical element, comprising the filling step of filling the resin composition such that a portion of the resin composition is filled between the light-shielding film and the mold. (Method 2) The method for manufacturing an optical element according to Method 1, wherein the curing step includes irradiating ultraviolet light such that the curing reaction rate of the resin portion formed by the curing of the resin composition between the light-shielding film and the mold is 40% or more and 95% or less. (Method 3) A method for manufacturing an optical element according to method 1 or 2, further comprising a coating step of applying a coupling agent to at least a portion of the first surface not covered by the light-shielding film and a portion of the surface of the light-shielding film, prior to the filling step. [Explanation of Symbols]

[0079] 1. Glass substrate 1A 1st page 1B 2nd side 1C optical surface 1D flat surface 1E Ridge 1F side 2 Resin part 2a Resin composition Type 4 5 Ejectors 10 Optical elements R lamination area 500 Imaging device (digital camera) 501 Optical Instruments (Lens Barrels) 502 Camera body 503 lens 505 lens

Claims

1. A glass substrate having a first surface and a second surface facing the first surface, A resin part provided on the first surface, The glass substrate comprises a light-shielding film covering at least a portion of the side surface and a portion of the first surface, The second surface is the incident or outgoing surface of light, A portion of the light-shielding film is provided between the glass substrate and the resin portion. The linear expansion coefficient of the light-shielding film is between the linear expansion coefficient of the glass substrate and the linear expansion coefficient of the resin part. The ratio of the maximum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 5 or more, and The ratio of the minimum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 1 / 5 or less. An optical element characterized by satisfying at least one of the following conditions.

2. The optical element according to claim 1, wherein the coefficient of linear expansion of the resin portion is 50 ppm / K or more and 150 ppm / K or less.

3. The first surface has an optical surface, a flat surface provided on the outer edge of the optical surface, and a ridge line that forms the boundary line between the optical surface and the flat surface. The resin portion is provided so as to extend from the optical surface across the ridge line to a part of the flat surface, The optical element according to claim 1, wherein the light-shielding film is provided so as to extend from the flat surface across the ridge line to a part of the optical surface.

4. The optical element according to claim 3, wherein the width of the region in which the resin portion and the light-shielding film are laminated is 1% or more and 10% or less when the radius of the optical surface is taken as 100%.

5. The optical element according to claim 1, wherein the water absorption expansion rate of the resin portion is 0.8% or less.

6. A glass substrate having a first surface and a second surface facing the first surface, A resin part provided on the first surface, The glass substrate comprises a light-shielding film covering at least a portion of the side surface and a portion of the first surface, The second surface is the incident or outgoing surface of light, A portion of the light-shielding film is provided between the glass substrate and the resin portion. The linear expansion coefficient of the light-shielding film is between the linear expansion coefficient of the glass substrate and the linear expansion coefficient of the resin part. The first surface has an optical surface, a flat surface provided on the outer edge of the optical surface, and a ridge line that forms the boundary line between the optical surface and the flat surface. The resin portion is provided so as to extend from the optical surface across the ridge line to a part of the flat surface, The optical element is characterized in that the light-shielding film is provided so as to extend from the flat surface across the ridge line to a part of the optical surface.

7. The ratio of the maximum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 5 or more, and The ratio of the minimum thickness of the resin portion in the optical axis direction to the thickness of the resin portion in the optical axis direction at the center position of the optical surface of the first surface is 1 / 5 or less. The optical element according to claim 6, which satisfies at least one of the following conditions.

8. The optical element according to claim 6, wherein the coefficient of linear expansion of the resin portion is 50 ppm / K or more and 150 ppm / K or less.

9. The optical element according to claim 6, wherein the width of the region in which the resin portion and the light-shielding film are laminated is 1% or more and 10% or less when the radius of the optical surface is taken as 100%.

10. The optical element according to claim 6, wherein the water absorption expansion rate of the resin portion is 0.8% or less.

11. An optical instrument comprising a housing and an optical system having at least one lens disposed within the housing, An optical device characterized in that at least one of the lenses is an optical element according to any one of claims 1 to 10.

12. An imaging device comprising a housing, an optical system having at least one lens disposed within the housing, and an image sensor that receives light passing through the optical system, An imaging device characterized in that at least one of the lenses is an optical element according to any one of claims 1 to 10.

13. A method for manufacturing an optical element comprising a glass substrate having a first surface and a second surface facing the first surface, and a resin portion provided on the first surface, wherein the second surface is either an incident surface or an outgoing surface for light, A preparation step of preparing the glass substrate on which the light-shielding film is formed, A filling step of filling the glass substrate and the mold with a resin composition, A curing step in which the resin composition is cured to form the resin part, A mold release step for releasing the resin part, It has, The light-shielding film is formed on the glass substrate so as to cover at least a portion of the side surface and a portion of the first surface of the glass substrate. A method for manufacturing an optical element, comprising the step of filling the resin composition such that a portion of the resin composition is filled between the light-shielding film and the mold, thereby obtaining the optical element according to any one of claims 1 to 10.

14. The method for manufacturing an optical element according to claim 13, wherein the curing step includes irradiating ultraviolet light such that the curing reaction rate of the resin portion formed by the curing of the resin composition between the light-shielding film and the mold is 40% or more and 95% or less.

15. The method for manufacturing an optical element according to claim 13, further comprising a coating step of applying a coupling agent to at least a portion of the first surface not covered by the light-shielding film and a portion of the surface of the light-shielding film, prior to the filling step.

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