JP6775026B2 - Composite optical element - Google Patents

Description

The present invention relates to composite optical elements.

In a composite optical element in which a resin layer is provided on the surface of a glass base material, a resin composition sandwiched between a central portion of the surface of the glass base material and a molding surface of a molding mold is typically a glass base. The resin composition is expanded along the surface of the material toward the outer diameter side, and the expanded resin composition is cured to produce the resin composition (see, for example, Patent Document 1 and Patent Document 2).

In the composite optical element described in Patent Document 1, the resin layer is applied not only to the optical element surface provided in the central portion of the surface of the glass base material but also to the notched surface provided on the outer periphery of the optical element surface. Is also formed, and the cutout surface is a rough surface from the viewpoint of enhancing the adhesion of the resin layer.

In the composite optical element described in Patent Document 2, the resin layer is formed not only on the central portion of the surface of the glass base material but also on the outer peripheral portion, and the resin layer formed on the outer peripheral portion of the glass base material. An inclined portion that gradually becomes thinner toward the outer diameter side is formed on the optically effective outside.

Japanese Patent Application Laid-Open No. 2008-299148 Japanese Patent Application Laid-Open No. 2013-254200

In the above method for manufacturing a composite optical element, it is desirable that the resin composition is uniformly spread in a circular shape from the central portion of the surface of the glass base material, but the spread of the resin composition may be non-uniform. For example, in the composite optical element described in Patent Document 1, the notched surface provided on the outer periphery of the optical element surface on which the resin layer is formed is a rough surface, and the resin composition on the surface of the glass base material. The wettability of the resin composition may differ between the optical element surface and the notched surface, and the spread of the resin composition may become non-uniform due to the influence of this change in wettability. If the spread of the resin composition is not uniform, a portion covered by the resin layer and a portion not covered by the resin layer may occur on the same circumference of the surface of the glass substrate, resulting in a poor appearance. Yes, and there is a risk of ghosting.

With respect to the non-uniform spread of the resin composition, in the composite optical element described in Patent Document 2, an inclined portion gradually thinning toward the outer diameter side is formed on the optically effective outside of the resin layer. The molding space between the surface of the glass base material for molding the inclined portion of the resin layer and the molding surface of the molding mold (hereinafter referred to as the inclined portion molding space) is gradually narrowed toward the outer diameter side and toward the outer diameter side. Due to the gradually narrowing space shape, the flow resistance toward the outer diameter side in the inclined partial molding space of the resin composition becomes higher than the flow resistance in the circumferential direction. Therefore, when the resin composition spread toward the outer diameter side along the surface of the glass base material reaches the inclined partial molding space, the resin composition flows in the inclined partial molding space in the circumferential direction. As a result, the inclined partial molding space is filled with the resin composition, and the non-uniform spread of the resin composition is suppressed.

However, in order to fill the inclined partial molding space with the resin composition by utilizing the difference between the flow resistance toward the outer diameter side of the resin composition and the flow resistance in the circumferential direction, the flow resistance toward the outer diameter side is used. It is necessary to make a relatively large difference between the flow resistance in the circumferential direction and the flow resistance in the circumferential direction. Therefore, a suitable viscosity is required for the resin composition, but as the viscosity increases, it takes time to spread the resin composition along the surface of the glass base material, and the production efficiency decreases. Further, if it is attempted to shorten the time for spreading the resin composition, there is a possibility that air bubbles may be caught in the resin composition even by a slight change in the wettability of the molding surface of the molding die.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composite optical element having a resin layer uniformly spread on the surface of a glass substrate and having excellent manufacturing efficiency.

The composite optical element of one aspect of the present invention includes a glass base material having an optical surface and a flange surface provided on the outer periphery of the optical surface, and a resin layer formed on the optical surface and the flange surface. , The optical surface of the resin layer and the surface opposite to the flange surface side are exposed, and the resin layer gradually becomes thicker toward the outer periphery in the flange surface region overlapping the flange surface. Moreover, it has at least one exposed annular convex portion, the flange surface is a flat surface, and the inner diameter side edge of the surface of the annular convex portion located closest to the optical surface side in the flange surface region of the resin layer. The thickness of the portion extending from the inner diameter side to the inner diameter side is uniform, and the angle formed by the tangent line at the inner diameter side edge and the flange surface is 60 ° or more and 90 ° or less in the cross section including the optical axis. The arithmetic average roughness Ra is 0.3 μm or more and 2.0 μm or less.

According to the present invention, it is possible to provide a composite optical element having a resin layer uniformly spread on the surface of a glass base material and having excellent manufacturing efficiency.

It is sectional drawing of an example of the composite optical element for demonstrating the embodiment of this invention. It is an enlarged view of the part surrounded by the broken line circle II of FIG. It is sectional drawing which shows the main part of the modification of the composite optical element of FIG. 1 in an enlarged manner. It is sectional drawing of the molding mold used for manufacturing the composite optical element of FIG. It is an enlarged view of the part surrounded by the broken line circle V of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is a schematic diagram which shows the behavior of the curable resin composition in the manufacturing process of the composite optical element of FIG. It is sectional drawing of the modification of the molding die of FIG.

1 and 2 show an example of a composite optical element for explaining an embodiment of the present invention.

The composite optical element 1 shown in FIGS. 1 and 2 includes a glass base material 2 and a resin layer 3 that overlaps one surface of the glass base material 2.

One surface of the glass base material 2 on which the resin layer 3 overlaps has a circular optical surface 4 and a flange surface 5 provided on the outer periphery of the optical surface 4. Although the optical surface 4 is formed in a concave spherical shape in the illustrated example, the optical surface 4 is not limited to the concave spherical surface shape, and may be formed in a flat surface shape or a convex spherical surface shape.

The resin layer 3 is formed in a circular shape concentric with the optical surface 4, has an optical surface region 6 overlapping the optical surface 4, and a flange surface region 7 overlapping the flange surface 5, and has the optical surface 4 and the flange surface. It is formed on top of 5. The flange surface region 7 does not have to overlap the entire flange surface 5, and in the illustrated example, the outer edge of the flange surface region 7 is arranged in the surface of the flange surface 5.

It prevents the outer edge of the flange surface region 7 of the resin layer 3 arranged in the surface of the flange surface 5 from being visually recognized from the other surface side of the glass base material 2, and also prevents flare and ghost from occurring during use. In this example, the flange surface 5 is roughened in order to suppress the surface roughness, and the surface roughness of the flange surface 5 is larger than the surface roughness of the optical surface 4. As a method of roughening the flange surface 5, a method of roughening the flange surface 5 by grinding the flange surface 5 with a coarse grinding wheel, and a method of molding the flange surface 5 using a roughened molding die. By doing so, a method of roughening the flange surface 5 and a method of roughening the flange surface 5 by performing sandblasting after masking the lens to expose only the flange surface 5 can be exemplified. From the viewpoint of shielding the outer edge of the resin layer 3 and suppressing the occurrence of flare and ghost, the surface roughness of the flange surface 5 is preferably 0.3 μm or more in arithmetic average roughness Ra.

As shown in FIG. 2, the flange surface region 7 of the resin layer 3 is provided with an annular convex portion 8 centered on the optical axis x (see FIG. 1). The annular convex portion 8 is formed so as to gradually become thicker toward the outer circumference, and the angle formed by the tangent line t1 and the flange surface 5 at the inner diameter side edge 8e of the surface of the annular convex portion 8 in the cross section including the optical axis x. θ1 is 60 ° or more and 90 ° or less. In the examples shown in FIGS. 1 and 2, one annular convex portion 8 is provided in the flange surface region 7, but as in the example shown in FIG. 3, a plurality of annular convex portions 8 are provided in the flange surface region 7. May be provided concentrically with each other.

4 and 5 show molding dies used in the manufacture of the composite optical element 1.

The method for manufacturing the composite optical element 1 is a step of sandwiching the curable resin composition R between the optical surface 4 of the glass base material 2 and the molding surface 11 of the molding die 10 and between the optical surface 4 and the molding surface 11. The curable resin composition R sandwiched between the two was spread along the optical surface 4 and the flange surface 5 of the glass substrate 2 toward the outer diameter side, and the curable resin composition R was spread along the optical surface 4 and the flange surface 5. A step of curing the curable resin composition R to form the resin layer 3 is provided.

The molding surface 11 of the molding die 10 has an optical surface region 12 arranged to face the optical surface 4 of the glass base material 2 and a flange surface region 13 arranged to face the flange surface 5. The optical surface region 12 is formed in a convex spherical shape in the illustrated example, but is not limited to the convex spherical shape. As described above, an annular convex portion 8 (see FIG. 2) that gradually becomes thicker toward the outer periphery is formed in the flange surface region 7 of the resin layer 3 that is a cured product of the curable resin composition R, and the curable resin composition. The flange surface region 13 of the molding surface 11 for molding R is provided with an annular recess 14 that gradually becomes deeper toward the outer periphery corresponding to the annular convex portion 8 of the resin layer 3, and is provided on the surface of the annular recess 14. The angle θ2 formed by the tangent line t2 and the flange surface 5 on the inner diameter side edge 14e is 60 ° or more and 90 ° or less.

6A and 6B schematically show the behavior of the curable resin composition R in the process of being spread toward the outer diameter side along the flange surface 5 of the glass substrate 2. FIG. 6A shows the behavior of the curable resin composition R at an angle θ2. The behavior of the curable resin composition R when it is relatively small is shown, and FIG. 6B shows the behavior of the curable resin composition R when the angle θ2 is relatively large.

In the process in which the curable resin composition R is spread toward the outer diameter side along the flange surface 5, the curable resin composition R wets and spreads over the flange surface region 13 of the molding surface 11, but the curable resin composition When the edge of R on the molding surface 11 reaches the inner diameter side edge 14e of the surface of the annular recess 14, the wet spread of the curable resin composition R is temporarily blocked by the inner diameter side edge 14e.

When the curable resin composition R extends beyond the inner diameter side edge 14e to the surface of the annular recess 14, the annular shape of the curable resin composition R with respect to the displacement amount Δr along the flange surface 5 of the curable resin composition R. Examining the displacement amount Δh along the surface of the recess 14, the larger the angle θ2, the larger the displacement amount Δh. That is, the larger the angle θ2, the more the wetting spread of the curable resin composition R along the surface of the annular recess 14 is suppressed.

By suppressing the wet spread of the curable resin composition R along the surface of the annular recess 14 in this way, the local spread of the curable resin composition R along the flange surface 5 is suppressed, and the curability is curable. The spread of the resin composition R is made uniform in a circular shape. Since the wet spread of the curable resin composition R along the surface of the annular recess 14 is related to the surface tension of the curable resin composition R, the glass base material 2 is irrespective of the viscosity of the curable resin composition R. It is possible to efficiently form the resin layer 3 uniformly spread on the optical surface 4 and the flange surface 5.

Then, by setting the angle θ2 formed by the tangent line t2 and the flange surface 5 at the inner diameter side edge 14e of the surface of the annular recess 14 to 60 ° or more, the curable resin composition R spreads locally along the flange surface 5. Can be sufficiently suppressed, and the resin layer 3 uniformly spread in a circle on the optical surface 4 and the flange surface 5 of the glass base material 2 can be efficiently formed. On the other hand, if the angle θ2 is larger than 90 °, a so-called undercut is formed in the annular convex portion 8 of the resin layer 3, making it difficult to remove the molding die 10. Therefore, the angle θ1 formed by the tangent line t1 and the flange surface 5 at the inner diameter side edge 8e of the surface of the annular convex portion 8 of the resin layer 3 formed by the angle θ2 and the annular concave portion 14 and corresponding to the angle θ2. Is 60 ° or more and 90 ° or less.

7A and 7B, and 8A and 8B, schematically show the behavior of the curable resin composition R in the process of being spread toward the outer diameter side along the flange surface 5 of the glass substrate 2. FIG. 7A shows the behavior of the curable resin composition R when the distance D between the inner diameter side edge 14e of the surface of the annular recess 14 of the molding die 10 and the flange surface 5 of the glass base material 2 is relatively large. Reference numeral 7B shows the behavior of the curable resin composition R when the interval D is relatively small. The interval D is the distance of the flange surface 5 in the normal direction. Further, FIG. 8A shows the behavior of the curable resin composition R when the surface roughness of the flange surface 5 is relatively large, and FIG. 8B shows the curing when the surface roughness of the flange surface 5 is relatively small. The behavior of the sex resin composition R is shown.

The angle formed by the tangent line t3 at the inner diameter side edge 14e of the liquid surface of the curable resin composition R blocked by the inner diameter side edge 14e and the normal line n of the flange surface 5 passing through the inner diameter side edge 14e is the wet spread angle. As β, it is preferable to reduce the wetting spread angle β from the viewpoint of uniformly spreading the curable resin composition R in a circular shape.

As shown in FIGS. 7A and 7B, the smaller the interval D, the smaller the wetting spread angle β. Preferably, the thickness T (see FIG. 2) of the inner diameter side edge 8e of the surface of the annular convex portion 8 of the resin layer 3 formed by the interval D and the annular recess 14 and corresponding to the interval D is 0.5 mm. It is as follows.

The flange surface 5 is a rough surface from the viewpoint of shielding the outer edge of the resin layer 3 and suppressing the generation of flare and ghost. However, the larger the surface roughness of the flange surface 5, the more the curable resin composition R becomes. It easily spreads on the flange surface 5, and as shown in FIGS. 8A and 8B, the smaller the surface roughness of the flange surface 5, the smaller the wet spread angle β. Preferably, the surface roughness of the flange surface 5 is 2.0 μm or less in arithmetic average roughness Ra.

Further, the wet spread angle β is related to the surface tension of the curable resin composition R, and the larger the surface tension, the smaller the wet spread angle β. Examples of the curable resin composition having a relatively large surface tension include a curable resin composition containing a polymerizable aromatic-containing monomer, which is 40% by mass or more based on the total solid content of the curable resin composition. It is preferable to contain the polymerizable aromatic-containing monomer of.

The polymerizable aromatic-containing monomer is a compound containing an aromatic group in its structure and containing a polymerizable unsaturated double bond such as a (meth) acryloyl group or a vinyl group. Examples of the aromatic group include a benzene ring, a naphthalene ring, a biphenyl ring, a heterocycle, and the like, and examples of the heterocycle include a morpholine ring, a piperidine ring, a pyrrolidine ring, a piperazine ring, and the like. Examples of the polymerizable aromatic-containing monomer include JP2012-140579, JP2014-198819, JP2015-178547, JP2015-193809, and JP2012-082386. The polymerizable aromatic-containing monomer described in 1) can be used.

As shown in FIG. 9, a plurality of annular recesses 14 may be provided concentrically in the flange surface region 13 of the molding surface 11. In this case, as shown in FIG. 3, a plurality of annular protrusions may be provided. 8 are concentrically provided in the flange surface region 7 of the resin layer 3. By providing the plurality of annular recesses 14, the wet spread of the curable resin composition R that wets and spreads over the flange surface region 13 of the molded surface 11 is blocked by the inner diameter side edges 14e of each of the annular recesses 14 and thus cured. The spread of the sex resin composition R can be further made uniform.

An experimental example will be described below.

<Glass substrate>
As shown in FIG. 1, a glass base material having an optical surface 4 and a flange surface 5 provided on the outer periphery of the optical surface 4 was prepared. The optical surface 4 is formed in a concave spherical shape having an outer diameter of 36 mm and a radius of curvature of 20 mm. Further, the flange surface 5 was subjected to a grinding process using a grindstone, and the arithmetic average roughness Ra of the ground flange surface 5 was evaluated.

Arithmetic average roughness Ra of the flange surface 5, the shape profile of the flange surface 5 in the radial direction of the glass substrate as a _{(x i, f (x i} )), defined by the following equation. CMM: (trade name UA3P Panasonic Corporation), as [Delta] x i ₌ 1 [mu] m, the shape of the flange surface 5 in the radial direction of the glass substrate was 1mm measured and evaluated using the measured shape profile.

Ra = ∫ | f (x) | dx = Σ | f (x _i ) | Δx _i ... (1)
Here, in the equation (1), Δx _i = x _{i + 1} −x _i .

<Preparation of curable resin composition>
Tricyclodecanedimethanol diacrylate (trade name: A-DCP manufactured by Shin-Nakamura Chemical Co., Ltd.) as a polymerizable aromatic-free polymer (base polymer), and O-phenylphenyl acrylate (commodity) as a polymerizable aromatic-containing monomer. Name: PhOEA manufactured by Tokyo Kasei Kogyo Co., Ltd.) or benzyl acrylate (trade name: manufactured by BnA Aldrich), and 1-hydroxycyclohexylphenylketone (trade name: manufactured by Irg184 BASF) as a photoradical polymerization initiator are shown in Table 1. Mixing was performed according to the composition ratio shown to prepare curable resin compositions 1 to curable resin compositions 4 having different contents of the polymerizable aromatic-containing monomer with respect to the total solid content.

<Molding of curable resin composition>
The optical surface 4 of the glass base material and the flange surface 5 of the glass base material were subjected to a silane coupling treatment to strengthen the adhesion with the resin layer 3. Then, 0.66 ml of a curable resin composition was placed in the central portion of the optical surface 4 of the glass substrate subjected to the silane coupling treatment, and the curable resin composition was molded using a molding die. As the molding die, the molding die shown in FIGS. 4 and 5 in which one annular recess 14 is provided in the flange surface region 13 of the molding surface 11, or two annular recesses 14 in the flange surface region 13 of the molding surface 11. The angle θ2 (see FIG. 5) formed by the tangent line t2 and the flange surface 5 at the inner diameter side edge 14e of the surface of the annular recess 14 was set for each experimental example by using the molding die shown in FIG. The molding surface 11 was formed in a convex spherical shape having an outer diameter of 37 mm and a radius of curvature of 21 mm, which is common to all the molding molds of the experimental examples. Then, until the distance D (see FIGS. 7A and 7B) between the inner diameter side edge 14e of the surface of the annular recess 14 of the molding die and the flange surface 5 of the glass base material becomes a value set for each experimental example, the glass base material is used. And the molding die are relatively close to each other at a speed of 0.1 mm / s, and the curable resin composition is spread toward the outer diameter side along the optical surface 4 and the flange surface 5 of the glass substrate. The curable resin composition was filled between the optical surface 4 and the flange surface 5 and the molding surface 11. The curable resin composition filled between the optical surface 4 and the flange surface 5 and the molding surface 11 is irradiated with ultraviolet light from an ultraviolet irradiation lamp to cure the curable resin composition to form a resin layer 3. Formed.

<Evaluation of filling property>
The above curable resin composition was molded 10 times for each experimental example, and inside the outermost annular recess 14, the curable resin composition was formed between the surface of the glass substrate and the molding surface 11 of the mold. The probability that the product was filled without voids (filling success rate) was evaluated. The evaluation results are shown in Table 2 together with the angle θ2, the interval D, the surface roughness (arithmetic mean roughness) Ra, the number of annular recesses 14, and the type of curable resin composition used for each experimental example.

In Experimental Examples 1 to 7, the angle θ2 formed by the tangent line t2 and the flange surface 5 at the inner diameter side edge 14e of the surface of the annular recess 14 of the molding die is less than 60 °, and the filling success rate is 40% or less. On the other hand, in Experimental Examples 8 to 16 in which the angle θ2 was 60 ° or more, the filling success rate was 70% or more. From this, by setting the angle θ2 to 60 ° or more, the local spread of the curable resin composition along the flange surface 5 can be sufficiently suppressed, and as a result, the optical surface 4 and the flange surface of the glass substrate can be sufficiently suppressed. It can be seen that the resin layer that spreads uniformly in a circle can be formed on 5.

Further, comparing Experimental Example 2 and Experimental Example 3 in which only the distance D between the inner diameter side edge 14e of the surface of the annular recess 14 of the molding die and the flange surface 5 of the glass base material is different, the experimental example in which the distance D is 1000 μm. In Experimental Example 2, the filling success rate is 10%, whereas in Experimental Example 2 where the interval D is 500 μm, the filling success rate is improved to 40%. From this, it can be seen that the interval D is preferably 500 μm or less (0.5 mm or less) from the viewpoint of uniformly spreading the curable resin composition in a circular shape. In particular, in Experimental Example 10 in which the interval D is 250 μm, the filling success rate is 100%, and it can be seen that the interval D is more preferably 250 μm or less.

Comparing Experimental Example 15 and Experimental Example 16 in which only the surface roughness Ra of the flange surface 5 is different, filling was successful in Experimental Example 16 in which the surface roughness Ra of the flange surface 5 is 2.08 μm, which is larger than 2.0 μm. While the rate is 80%, in Experimental Example 15 in which the surface roughness Ra of the flange surface 5 is 2.0 μm or less and 1.12 μm, the filling success rate is improved to 90%. Further, when comparing Experimental Example 12 and Experimental Example 15 in which only the number of annular recesses 14 is different, the filling success rate of Experimental Example 15 in which the number of annular recesses 14 is one is 90%, whereas the annular recess is 90%. In Experimental Example 12, in which the number of 14 is 2, the filling success rate is improved to 100%. From this, it can be seen that the surface roughness Ra of the flange surface 5 is preferably 2.0 μm or less, and a plurality of annular recesses 14 are preferably provided from the viewpoint of uniformly spreading the curable resin composition in a circular shape.

Further, comparing Experimental Example 2, Experimental Example 5, Experimental Example 6, and Experimental Example 7 in which only the type of the curable resin composition is different, the curable resin composition 1 containing no polymerizable aromatic-containing monomer is used. The priority success rate of Experimental Example 5 was 20%, and the filling success rate of Experimental Example 6 using the curable resin composition 2 in which the content of the polymerizable aromatic-containing monomer was less than 40% by mass was 25%. On the other hand, in Experimental Example 2 and Experimental Example 7 using the curable resin composition 3 or the curable resin composition 4 in which the content of the polymerizable aromatic-containing monomer is 40% by mass or more, the filling success rate is 40. It has improved to%. Similarly, when comparing Experimental Example 9, Experimental Example 13, and Experimental Example 14 in which only the types of curable resin compositions are different, the content of the polymerizable aromatic-containing monomer is less than 40% by mass. The curable resin composition 3 or the curable resin composition in which the filling success rate of Experimental Example 13 using the resin composition 2 is 75%, while the content of the polymerizable aromatic-containing monomer is 40% by mass or more. In Experimental Example 9 and Experimental Example 14 using the object 4, the filling success rate is improved to 90%. From this, from the viewpoint of uniformly spreading the curable resin composition in a circular shape, a curable resin composition containing a polymerizable aromatic-containing monomer having a relatively large surface tension is preferable as the curable resin composition. It can be seen that the content of the polymerizable aromatic-containing monomer with respect to the total solid content is more preferably 40% by mass or more.

As described above, the composite optical element disclosed in the present specification is formed on a glass base material having an optical surface and a flange surface provided on the outer periphery of the optical surface, and the optical surface and the flange surface. The resin layer comprises at least one annular convex portion that gradually becomes thicker toward the outer periphery in a flange surface region that overlaps the flange surface, and the above-mentioned resin layer is provided in a cross section including an optical axis. The angle formed by the tangent line at the inner diameter side edge of the surface of the annular convex portion and the flange surface is 60 ° or more and 90 ° or less.

Further, the composite optical element disclosed in the present specification has a thickness of 0.5 mm or less at the inner diameter side edge of the surface of the annular convex portion.

Further, in the composite optical element disclosed in the present specification, the surface roughness of the flange surface is larger than the surface roughness of the optical surface.

Further, in the composite optical element disclosed in the present specification, the arithmetic average roughness Ra of the flange surface is 0.3 μm or more and 2.0 μm or less.

Further, in the composite optical element disclosed in the present specification, the resin layer has a plurality of the annular convex portions in the flange surface region.

Further, in the composite optical element disclosed in the present specification, the resin layer is a cured product of a curable composition containing a polymerizable aromatic-containing monomer.

Further, in the composite optical element disclosed in the present specification, the content of the polymerizable aromatic-containing monomer in the curable composition is 40% by mass or more based on the total solid content of the curable composition. is there.

The present invention can be used for a composite optical element in which a resin layer is provided on the surface of a glass substrate.

The embodiments of the present invention have been described in detail above, but this is merely an example, and the present invention can be carried out in a mode in which various modifications are made without departing from the spirit thereof. This application is based on a Japanese patent application filed on September 29, 2016 (Japanese Patent Application No. 2016-191673), the contents of which are incorporated herein by reference.

1 Composite optical element 2 Glass base material 3 Resin layer 4 Optical surface of glass base material 5 Flange surface of glass base material 6 Optical surface area of resin layer 7 Flange surface area of resin layer 8 Cyclic convex portion 8e Inner diameter of annular convex portion surface Side edge 10 Molding mold 11 Molding surface 12 Optical surface area of molding surface 13 Flange surface area of molding surface 14 Annular recess 14e Inner diameter side edge of annular recess surface D Interval n Normal line R Curable resin composition T Thickness t1 tangent line t2 tangent line t3 tangent x optical axis β wet spread angle Δh displacement amount Δr displacement amount θ1 angle θ2 angle

Claims (6)

A glass base material having an optical surface and a flange surface provided on the outer periphery of the optical surface,
A resin layer formed on the optical surface and the flange surface, and
With
The surface of the resin layer opposite to the optical surface and the flange surface side is exposed.
The resin layer has at least one annular convex portion that is gradually thickened and exposed toward the outer periphery in a flange surface region that overlaps the flange surface.
The flange surface is a flat surface and
In the flange surface region of the resin layer, the thickness of the portion extending from the inner diameter side edge to the inner diameter side of the surface of the annular convex portion located most on the optical surface side is uniform.
In the cross section including the optical axis, the angle formed by the tangent line at the inner diameter side edge and the flange surface is 60 ° or more and 90 ° or less.
A composite optical element having an arithmetic mean roughness Ra of the flange surface of 0.3 μm or more and 2.0 μm or less. The composite optical element according to claim 1.
A composite optical element having a thickness of 0.5 mm or less at a portion extending from the inner diameter side edge to the inner diameter side . The composite optical element according to claim 1 or 2.
A composite optical element in which the surface roughness of the flange surface is larger than the surface roughness of the optical surface. The composite optical element according to any one of claims 1 to 3.
The resin layer is a composite optical element having a plurality of the annular convex portions in the flange surface region. The composite optical element according to any one of claims 1 to 4.
The resin layer is a composite optical element which is a cured product of a curable composition containing a polymerizable aromatic-containing monomer. The composite optical element according to claim 5.
A composite optical element in which the content of the polymerizable aromatic-containing monomer in the curable composition is 40% by mass or more with respect to the total solid content of the curable composition.

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