JP7690188B2 - Manufacturing method of molded lens, molded lens, and molding die - Google Patents

Description

The present invention relates to a method for manufacturing a molded lens that improves moldability, a molded lens, and a molding die.

Lens units with multiple lenses built into a lens barrel are built into, for example, mobile terminals and in-vehicle imaging modules. Lenses include glass lenses and resin (plastic) lenses, and hybrid lenses, which combine glass and resin for weight reduction, productivity, durability, etc., and in which a photocurable resin is bonded to the surface of glass, are also becoming more common.

Injection molding, UV curing, LIM molding, etc., lenses are manufactured using molds. When molding lenses, the transferability is increased to produce high-precision lenses, but this results in poor demoldability.

For example, Patent Document 1 describes an improvement in mold releasability at least on the mold surface that comes into contact with the resin (particularly the bottom surface of the mold cavity). Patent Document 2 describes an improvement in mold releasability without increasing the number of steps before and after molding.

JP 2008-307735 A JP 2012-045900 A

However, demolding, which is generally a problem with molded products made using a metal mold, is also often an issue with molded lenses.

Compared to glass lenses, the shape of the lens surface of a resin molded lens changes more over time, and if the shape of the lens surface changes, there is a problem that the optical performance of the lens unit as a whole can deteriorate due to changes in, for example, the focal length.

In photocuring molding, when optical performance is taken into consideration, it is necessary to provide an excess area (non-lens portion) on the outer periphery of the aspheric effective portion of the lens portion. This is intended to replenish resin from the non-lens portion to avoid a shortage of resin in the lens portion when the photocuring resin cures and shrinks, resulting in poor transferability. In addition, when dropping the photocuring resin, a dispenser or other equipment is used to control the variation in the amount, but since it cannot be completely controlled, the non-lens portion is provided and used as an area to cover the variation between shots. Furthermore, when photocuring, the volume of the photocuring resin decreases by the amount that the photocuring resin shrinks, so good molding is possible by procuring external air from between the substrate having optical functions and the lens molding die. In addition, the supply amount of resin in the non-lens portion must be less than 100% of the volume set in the molding die. This is because, when the photocurable resin is evenly supplied up to the outer periphery of the non-lens portion, air is taken in from the outside to make up for the curing shrinkage of the photocurable resin, and this phenomenon ultimately causes air bubbles to appear inside the lens (non-lens portion or lens portion). In the following explanation, in order to distinguish between the lens portion and non-lens portion of a molded lens and the lens portion and non-lens portion of a molding die, the lens portion and non-lens portion of a molded lens will be referred to as the molded lens portion and molded non-lens portion, and the lens portion and non-lens portion of a molding die will be referred to as the mold lens portion and molded non-lens portion.

When trying to miniaturize a molded lens, this excess area becomes an obstacle, limiting the miniaturization of the outer diameter (or outer shape) of the substrate that has the optical function to which the molded lens part is attached. Forcibly reducing the size of the molding die will induce the inclusion of air bubbles, resulting in a defective molded lens.

In consideration of the above circumstances, the present invention provides a method for producing a molded lens, a molded lens, and a molding die that improves demolding properties, and is characterized by making it difficult for air bubbles to get into the molded product when the photocurable resin is cured, even if the photocurable resin is supplied up to the outer periphery limit of the molding die, making it possible to reduce the size of the molded lens.

A manufacturing method of a molded lens according to one aspect of the present invention that solves the above-mentioned problems is a manufacturing method of a molded lens in which a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion are formed of a photocurable resin, the molded lens portion and the molded non-lens portion are molded lenses joined to a substrate having an optical function, and the manufacturing method of a molded lens according to one aspect of the present invention includes a step of supplying the photocurable resin to a molding die having a mold lens portion and a mold non-lens portion having shapes corresponding to the molded lens portion and the molded non-lens portion, respectively , a step of joining the photocurable resin and the substrate having an optical function inside the molding die, a step of curing the molded lens portion with light before photocuring the molded non-lens portion, and a step of forming the molded lens portion by photocuring the molded non-lens portion. a step of hardening a non-lens portion with the light beam, and a step of releasing the molded lens from the molding die , wherein a convex portion is formed in the mold non-lens portion of the molding die, and a concave portion is formed in the mold non-lens portion of the molding die, the concave portion reaching the outermost periphery of the mold non-lens portion in a radial direction, outside the mold non-lens portion of the mold non-lens portion relative to the convex portion, and wherein when a distance from a center of the molding die to the outermost periphery of the mold lens portion is X1, a distance from the center of the molding die to the outermost periphery of the mold non-lens portion is X2, and X3 is defined by the following mathematical formula (1), the outer positions of the convex portions formed in the mold non-lens portion are located more inside than X3 .
(X2-X1)÷2=X3 Formula (1)

The method for manufacturing a molded lens is characterized in that the photocurable resin is an ultraviolet-curable resin that is cured by the light having a wavelength of 300 nm to 400 nm.

The method for manufacturing a molded lens is characterized in that the substrate having an optical function has a function of transmitting light wavelengths of 300 nm to 400 nm, and the photocurable resin is bonded to the surface of the substrate having an optical function.

a molded lens having a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion, the molded lens portion being bonded to a substrate having an optical function; a concave portion is formed in the molded non -lens portion of the molded lens; and a convex portion is formed in the molded non-lens portion of the molded lens, the convex portion reaching the outermost periphery of the molded non-lens portion in the radial direction, outside the molded non-lens portion relative to the concave portion; and when the distance from the center of the molded lens to the outermost periphery of the molded lens portion is X1, the distance from the center of the molded lens to the outermost periphery of the molded non-lens portion is X2, and X3 is defined by the following mathematical formula (1), the outer position of the concave portion formed in the molded non-lens portion is located inside X3 .
(X2-X1)÷2=X3 Formula (1)

The photocurable resin is a UV-curable resin that cures with light of 300 to 400 nm. A molded lens.

The substrate having the optical function has a function of transmitting light wavelengths of 300 nm to 400 nm, and the molded lens is characterized in that the photocurable resin is bonded to the surface of the substrate having the optical function.

A molded lens, characterized in that the molded lens portion or the molded non-lens portion is bonded to one or both sides of a glass lens.

a mold for molding a molded lens, in which a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion are formed from a photocurable resin, the mold for molding a molded lens has a mold lens portion and a mold non-lens portion having shapes corresponding to the molded lens portion and the molded non-lens portion, respectively, a convex portion is formed in the mold non- lens portion of the molding mold, and a concave portion is formed in the mold non-lens portion of the molding mold, the concave portion reaching the outermost periphery of the mold non-lens portion in the radial direction, outside the mold non-lens portion relative to the convex portion, and the distance from the center of the molding mold to the outermost periphery of the mold lens portion is X1, the distance from the center of the molding mold to the outermost periphery of the mold non-lens portion is X2, and X3 is defined by the following mathematical formula (1),
(X2-X1)÷2=X3 Formula (1)

The present invention provides a manufacturing method for a molded lens, a molded lens, and a molding die that improves demolding properties and enables a reduction in the outer diameter of the molded lens.

A perspective view of a conventional molding die Cross-sectional view of conventional molded lens manufacturing Cross-sectional view of conventional molded lens manufacturing (bubble generation phenomenon) Cross-sectional view of the molded lens manufacturing method of the present invention. FIG. 1 is a perspective view of a molding die according to the present invention. FIG. 1 is a perspective view of a molded lens according to the present invention. FIG. 2 is a perspective view of the molding die of the present invention. FIG. 2 is a perspective view of a molded lens according to the present invention. FIG. 3 is a perspective view of the molding die of the present invention. FIG. 3 is a perspective view of a molded lens according to the present invention. FIG. 4 is a perspective view of the molding die of the present invention. FIG. 4 is a perspective view of a molded lens according to the present invention.

The preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiment are merely examples to facilitate understanding of the invention, and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations, and elements not directly related to the present invention are not illustrated.

In the present invention, if resin is not completely supplied to the mold lens portion (effective area) of the molding die, the optical performance of the molded lens will not be satisfied, but resin does not have to be completely supplied to the mold non-lens portion (general flange portion, etc.), and there is no significant effect on the optical performance of the molded lens. Furthermore, the molded non-lens portion is intended to include all parts of the molded lens that are molded with resin other than the molded lens portion.

Fig. 1 shows a perspective view of a conventional molding die 1, and Fig. 2 shows a cross-sectional view of the molding die 1, a substrate 11 having an optical function, and a photocurable resin 12 when a molded lens is manufactured using the conventional molding die 1. The molding die 1 has a mold lens portion 1-1 and a mold non-lens portion 1-2, which are important for the performance of the molded lens, and on the outer periphery of the molding die 1 is a substrate receiving portion 1-3 of the molding die 1 for placing the substrate 11 having an optical function.

In order to satisfy the optical performance of the molded lens, the photocurable resin 12 must be completely supplied to the mold lens portion 1-1, but the optical properties are not significantly affected even if the photocurable resin 12 is not completely supplied to the mold non-lens portion 1-2. The supply of the photocurable resin 12 must be controlled while taking into consideration the supply variation of the photocurable resin 12. Examples of supply variation include shot-to-shot variation of a dispenser that supplies the photocurable resin 12 and fluctuations in the viscosity of the photocurable resin 12 due to the environment. If the supply amount of the photocurable resin 12 becomes large and exceeds the outermost periphery of the mold non-lens portion 1-2, it may cause a poor appearance of the molded lens or a deterioration in productivity.

3 shows the phenomenon of air bubbles 13 occurring during the manufacture of a molded lens. When a conventional molding die 1 is used and photocurable resin 12 is evenly supplied up to the outermost periphery of the die non-lens portion 1-2, air is supplied from the outside to make up for the shrinkage of the photocurable resin 12 as it cures, and as a result, air bubbles 13 may appear in the die non-lens portion 1-2.

4 shows a cross-sectional view of the molded lens produced according to the present invention, and the method for producing the molded lens of the present invention is as follows. An appropriate amount of photocurable resin 12 is supplied near the center of the mold lens portion 2-1 of the molding die 2. Then, a substrate 11 having an optical function is placed on the substrate receiving portion 2-3 of the molding die 2, and UV curing is performed to bond the photocurable resin 12 and the substrate 11 having an optical function inside the molding die 2. At that time, it is important to transfer the shape of the molded non-lens portion, which is intended to achieve good molding by procuring external air from between the substrate 11 having an optical function and the molding die 2 when the molded lens portion and the photocurable resin 12, which are important for the performance of the molded lens, are cured and shrunk, to the shape of the molding die 2 (mold lens portion 2-1, mold non-lens portion 2-2) , and it is important not to deteriorate the releasability while maintaining the transferability for producing a high-precision molded lens.

A feature of UV curing of a general molded lens is that curing is completed from the thin resin part, and curing shrinkage of the resin occurs at that time. For example, the resin that is insufficient due to the curing shrinkage of the resin may be filled from the thick resin part. The thick resin part will complete curing with only the remaining resin that is reduced in the state where the resin is filled in the thin resin part, and in the part where the resin is reduced, the resin is bonded to itself without being completely transferred to the molding die. As a result, the part where the resin is reduced is prone to sink marks. Therefore, in the area where the thickness of the photocurable resin is different, there are places where a phenomenon called sink marks occurs, and the present invention utilizes this phenomenon to form a convex part 2-4 on the mold non-lens part 2-2 while maintaining the transferability of the mold lens part 2-1 of the molding die 2, and has a structure that does not deteriorate the releasability to improve productivity. However, with regard to photocuring of mold lens portion 2-1, it is possible to avoid the phenomenon of sink marks in the molded lens portion within mold lens portion 2-1 by photocuring only the molded non-lens portion within mold lens portion 2-1 before photocuring the molded non-lens portion within the mold non-lens portion .

Additionally, X1, X2, and X3 are shown in Fig. 4 to explain the position of convex portion 2-4 formed in mold non-lens portion 2-2 (molded non-lens portion) of molding die 2. X1 shown in Fig. 4 is the distance from the center of molding die 2 to the outermost periphery of mold lens portion 2-1 (molded lens portion) , X2 is the distance from the center of molding die 2 to the outermost periphery of mold non-lens portion 2-2 (molded non-lens portion) , the position of convex portion 2-4 formed in mold non-lens portion 2-2 (molded non-lens portion) is the position obtained by adding X1 to X3 calculated by the following formula (1), and the position of convex portion 2-4 is defined by the following formula (1).
(X2-X1)÷2=X3 Formula (1)

Therefore, position X3 of convex portion 2-4 formed in mold non-lens portion 2-2 (molded non-lens portion) of molding die 2 is formed within a range of positions obtained by subtracting the distance from the center of molding die 2 to the outermost peripheral position X1 of mold lens portion 2-1 (molded lens portion) from the distance X2 from the center of molding die 2 to the outermost peripheral position of mold non-lens portion 2-2 (molded non-lens portion) plus half the distance from the center of molding die 2 to the outermost peripheral position of mold lens portion 2-1 (molded lens portion) .

Furthermore, there are no particular restrictions on the shape of the convex portion 2-4 formed in the mold non-lens portion 2-2 (molded non-lens portion) of the molding die 2, but in terms of height, it naturally cannot be greater than the height of the substrate receiving portion 2-3 of the molding die 2, and in terms of width, its inner position cannot be formed within the mold lens portion 2-1 (molded lens portion) of the molding die 2, and its outer position cannot be formed beyond the position X3.

Fig. 5 is a perspective view of the molding die 2 used in producing the molded lens of the present invention shown in Fig. 4, and it can be seen that a convex portion 2-4 is formed in the non-lens portion 2-2 of the molding die 2. The convex portion 2-4 shown in Fig. 5 is formed in a circumferential shape, but there is no limitation on the shape of the convex portion.

FIG. 6 is a perspective view of a molded lens manufactured using the manufacturing method for the molded lens of FIG. 4 and the molding die 2 of FIG. 5. The convex portion 2-4 formed in the mold non-lens portion 2-2 of the molding die 2 described in FIG. 5 and the manufacturing method of FIG. 4, which are features of the present invention, is formed as a concave portion 6-3 in the manufactured molded lens 6.

In conventional methods for manufacturing molded lenses, it was necessary to take cure shrinkage into consideration and to avoid supplying photocurable resin evenly to the non -lens portions of the molding die , and to provide excess area in the non-lens portions of the molding die.

If the photocurable resin is evenly supplied up to the outermost periphery of the molding die, air is taken in from the outside when the photocurable resin cures and shrinks, resulting in the formation of air bubbles in the molding non-lens portion. In other words, if the photocurable resin is supplied up to the outer periphery limit of the mold non-lens portion of the molding die, the photocurable resin, the substrate having optical functionality, and the molding die come into close contact and do not separate, and air enters, which can result in air bubbles, but the manufacturing method of the present invention makes it possible to avoid this phenomenon.

7 shows a perspective view of a molding die 3 used in the manufacture of a molded lens according to the present invention, and the manufacturing method of a molded lens according to the present invention is carried out as follows. An appropriate amount of photocurable resin 12 is supplied near the center of the mold lens portion 3-1 of the molding die 3. Then, a substrate 11 having an optical function is placed on the substrate receiving portion 3-3 of the molding die 3, and UV curing is carried out to bond the photocurable resin 12 and the substrate 11 having an optical function inside the molding die 3. At that time, when the mold lens portion 3-1 and the photocurable resin 12, which are important for the performance of the molded lens, cure and shrink, it is possible to achieve good molding by procuring external air from the recess 3-5 of the molding die 3, and the outer periphery of the photocurable resin 12 becomes free, so that cure and shrinkage can be carried out smoothly and air bubbles are less likely to occur.

The molding die 3 shown in Fig. 7 is characterized in that a recess 3-5 is formed on the outer periphery of the die non-lens portion 3-2 of the molding die 3, and air bubbles are less likely to occur in a manufacturing method for a molded lens that uses the molding die 3 shown in Fig. 7. In addition, in order to manage (control) the thickness of the molded lens, it is necessary to abut the substrate receiving portion 3-3 of the molding die 3 against the substrate 11 having an optical function, but since it is not necessary to abut the entire periphery of the substrate receiving portion 3-3 of the molding die 3, for example, it is possible to provide a slit shape in the substrate receiving portion 3-3 of the molding die 3, and when the photocurable resin 12 cures and shrinks, external air is supplied from the substrate 11 having an optical function and the recess 3-5 of the molding die 3, enabling good molding.

Furthermore, when it is desired to miniaturize the molded lens, the substrate receiving portion 1-3 of the molding die 1 places limitations on miniaturization of the outer diameter (or outer shape) of the substrate 11, which has an optical function of bonding the photocurable resin 12. Forcibly making the mold non-lens portion 1-2 of the molding die 1 small will induce the inclusion of air bubbles, resulting in a defective molded lens.

7, the molding die 3 of the present invention has a shape that does not generate air bubbles, by removing a part of the mold non-lens portion 3-2 of the molding die 3. Since the recesses 3-5 are formed up to the outermost periphery of the molding die 3, when the photocurable resin 12 cures and shrinks, external air is taken in from the recesses 3-5 of the molding die 3, enabling good molding and making it difficult for air bubbles to be generated.

There are no particular restrictions on the shape of the recesses 3-5 formed in the mold non-lens portion 3-2 of the molding die 3, but in the height direction, they naturally will not be higher than the height of the substrate receiving portion 3-3 of the molding die 3, and in the width direction, although it will vary depending on the number of steps, the inner position cannot be formed within the mold lens portion 3-1 of the molding die 3, and the outer position is formed reaching the outermost periphery of the molding die 3. There are no particular restrictions on the number of steps, and it is desirable for them to be formed evenly, but the optimum steps can be set as appropriate.

FIG. 8 is a perspective view of a molded lens 7 manufactured using the molding die 3 of FIG. 7, and the recess 3-5 formed in the mold non-lens portion 3-2 of the molding die 3 shown in FIG. 7, which is a feature of the present invention, is formed as a convex portion 7-4 in the manufactured molded lens 7.

Figure 9 shows a molding die 4 in which the recesses 3-5 formed in the molding die 3 of Figure 7 are not uniformly formed, and Figure 10 shows a molded lens 8 molded with the molding die 4 of Figure 9.

The molded lens 8 in FIG. 10, formed using the molding die 4 in FIG. 9, is characterized in that, for example, in the case of a molded lens 8 formed in a circle, the molding position (angle) of the molded lens 8 can be limited based on the unevenly formed convex portion 8-4 of the molded lens 8. If the molding die 4 has eccentricity, the eccentric direction of the molded lens 8 can be limited, so that when multiple molded lenses 8 are incorporated into a lens barrel to produce a lens unit, they can be assembled in the same eccentric direction as other molded lenses. For example, when assembling using an automatic machine, it is possible to perform assembly by image recognition of the unevenly formed portions.

When multiple molded lenses are incorporated into a lens barrel to produce a lens unit, the number and shape of the recesses 4-5 (protruding portions 8-4 of the molded lens) of the molding die 4 can be changed for each molded lens to manage the multiple molded lenses, making it possible to manage the type and lot of the molded lenses. The recesses 4-5 (protruding portions 8-4 of the molded lens) of the molding die 4 only need to be formed in at least one location, and the shape does not have to be parallel lines; for example, they may have curved, oblique lines, or stepped shapes in some places, allowing for a high degree of freedom in the formation.

The molding die 5 in FIG. 11 has a convex portion 5-4 formed therein, which corresponds to the convex portion 2-4 that is a characteristic of the molding die 2 shown in FIG. 4 and FIG. 5, and also has a concave portion 5-5 formed therein, which corresponds to the concave portion 3-5 that is a characteristic of the molding die 3 shown in FIG. 7. FIG. 12 shows a molded lens 9 molded using the molding die 5.

As shown in the molding die 5 in FIG. 11 and the molded lens 9 in FIG. 12, the convex portion of the molding die (the concave portion of the molded lens) and the concave portion of the molding die (the convex portion of the molded lens) have a high degree of freedom in combination and shape, and can be set appropriately depending on the optical performance and shape of the molded lens.

The photocurable resin 12 used in the present invention is optimally an ultraviolet-curable resin that cures with light of 300 nm to 400 nm. Similarly, the substrate 11 having an optical function has the function of transmitting light of wavelengths of 300 nm to 400 nm, and it is desirable to bond the ultraviolet-curable resin to the substrate 11 having an optical function.

The mold lens parts (1-1, 2-1, 3-1, 4-1, 5-1) and mold non-lens parts (1-2, 2-2, 3-2, 4-2, 5-2) produced by the molded lens production method according to the present invention are bonded to one or both sides of a substrate 11 having an optical function, and are selected according to the optical performance required for the molded lens. In addition, the substrate 11 having an optical function for molding the molded lens parts and molded non-lens parts can also be formed on the molded lens part of a glass lens on which a molded lens part has already been formed, and it is possible to produce molded lens parts and molded non-lens parts on any substrate depending on the application. In addition, even if a coating has been applied in advance to the substrate 11 having an optical function, it is possible to produce a molded lens as appropriate.

The molded lens in the above-mentioned embodiment has a cylindrical shape, but the present invention allows a high degree of freedom in the external shape, and can be set appropriately depending on the specifications of the molded lens.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Furthermore, various improvements and modifications can be made to the above embodiments without departing from the spirit of the present invention.

1 Molding mold 1
1-1 mold lens part 1-2 mold non-lens part 1-3 substrate receiving part 2 molding mold 2
2-1 mold lens part 2-2 mold non-lens part 2-3 substrate receiving part 2-4 convex part 3 molding mold 3
3-1 Mold lens part 3-2 Mold non-lens part 3-3 Substrate receiving part 3-5 Recess 4 Molding mold 4
4-1 Mold lens part 4-2 Mold non-lens part 4-3 Substrate receiving part 4-5 Recess 5 Molding mold 5
5-1 mold lens part 5-2 mold non-lens part 5-3 substrate receiving part 5-4 convex part 5-5 concave part 6 molded lens 6-1 molded lens part of molded lens 6-2 molded non-lens part of molded lens 6-3 concave part of molded lens 7 molded lens 7-1 molded lens part of molded lens 7-2 molded non-lens part of molded lens 7-4 convex part of molded lens 8 molded lens 8-1 molded lens part of molded lens 8-2 molded non-lens part of molded lens 8-4 convex part of molded lens 9 molded lens 9-1 molded lens part of molded lens 9-2 molded non-lens part of molded lens 9-3 concave part of molded lens 9-4 convex part of molded lens 11 substrate having optical function 12 photocurable resin 13 air bubbles

Claims (8)

A method for manufacturing a molded lens, in which a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion are formed of a photocurable resin,
a molded lens in which the molded lens portion and the molded non-lens portion are bonded to a substrate having an optical function,
supplying the photocurable resin to a molding die having a mold lens portion and a mold non-lens portion having shapes corresponding to the molded lens portion and the molded non-lens portion , respectively ;
bonding the photocurable resin and the optically functional substrate inside the molding die;
curing the molded lens portion with light before photo-curing the molded non-lens portion;
curing the molded non-lens portion with the light;
and releasing the molded lens from the molding die.
a convex portion is formed in the mold non-lens portion of the molding die ,
a recessed portion is formed in the mold non-lens portion of the molding die, the recessed portion being located outside the mold non-lens portion relative to the protruding portion and reaching an outermost periphery of the mold non-lens portion in a radial direction;
a distance from the center of the molding die to the outermost peripheral part of the mold lens portion is defined as X1, a distance from the center of the molding die to the outermost peripheral part of the mold non-lens portion is defined as X2, and X3 is defined by the following mathematical formula (1), wherein an outer position of the convex portion formed in the mold non-lens portion is located inside X3 :
(X2-X1)÷2=X3 Formula (1) 2. The method for manufacturing a molded lens according to claim 1 , wherein the photocurable resin is an ultraviolet-curable resin that is cured by the light having a wavelength of 300 nm to 400 nm. 3. The method for manufacturing a molded lens according to claim 1 or 2, characterized in that the substrate having an optical function transmits light having a wavelength of 300 nm to 400 nm, and the photocurable resin is bonded to a surface of the substrate having an optical function. A molded lens in which a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion are formed of a photocurable resin,
a molded lens in which the molded lens portion and the molded non-lens portion are bonded to a substrate having an optical function,
a recess is formed in the molded non-lens portion of the molded lens ,
a convex portion is formed on the molded non-lens portion of the molded lens, the convex portion being located outside the concave portion and reaching an outermost periphery of the molded non-lens portion in a radial direction;
a distance from the center of the molded lens to the outermost peripheral part of the molded lens portion is X1, a distance from the center of the molded lens to the outermost peripheral part of the molded non-lens portion is X2, and X3 is defined by the following mathematical formula (1), wherein an outer position of the recess formed in the molded non-lens portion is located inside X3 :
(X2-X1)÷2=X3 Formula (1) 5. The molded lens according to claim 4 , wherein the photocurable resin is an ultraviolet-curable resin that is cured by light having a wavelength of 300 nm to 400 nm. The molded lens according to claim 4 or 5, characterized in that the substrate having an optical function transmits light having a wavelength of 300 nm to 400 nm, and the photocurable resin is bonded to a surface of the substrate having an optical function. 7. The molded lens according to claim 4 , wherein the molded lens portion or the molded non-lens portion is bonded to one or both sides of a glass lens. A mold for a molded lens, in which a molded lens portion for refracting light and a molded non-lens portion on the outer periphery of the molded lens portion are formed of a photocurable resin,
the molding die has a mold lens portion and a mold non-lens portion having shapes corresponding to the molded lens portion and the molded non-lens portion, respectively;
a convex portion is formed in the mold non-lens portion of the molding die ,
a recessed portion is formed in the mold non-lens portion of the molding die, the recessed portion being located outside the mold non-lens portion relative to the protruding portion and reaching an outermost periphery of the mold non-lens portion in a radial direction;
a distance from a center of the molding die to the outermost peripheral portion of the mold lens portion is defined as X1, a distance from the center of the molding die to the outermost peripheral portion of the mold non-lens portion is defined as X2, and X3 is defined by the following mathematical formula (1), wherein an outer position of the convex portion formed in the mold non-lens portion is located more inside than X3 :
(X2-X1)÷2=X3 Formula (1)