JPH0768569A - Manufacture of composite type optical element - Google Patents

Abstract

PURPOSE:To manufacture an excellent composite type optical element without impairing a part around the most outer peripheral part of the surface of a resin layer when a metallic mold is separated from the resin layer. CONSTITUTION:An energy setting type resin is placed on at least one surface on a substrate 2 of an optical element. A required resin layer 3 is formed by pushing with a metal mold 1 for molding the optical element. The resin layer 3 is cured by irradiation with energy, and the cured resin layer is separated from the metal mold 1 to manufacture a composite type optical element. Herein the metallic mold having a shape wherein an angle of 15 deg.-45 deg. is made by a central axis outside an effective diameter of an optical surface of the metallic mold 1, and a distance from a surface perpendicular to the central axis passing a point on the most outer peripheral part within the optical effective diameter of a molded surface of the substrate grows the larger as it is separated the more apart from the central axis, is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a composite type optical element.

[0002]

2. Description of the Related Art Various methods are conventionally known for manufacturing a composite optical element. For example, JP-A-4-144
Japanese Patent No. 718 proposes a method of using a mold divided into an inner mold and an outer mold that are independently movable up and down outside the effective diameter of the optical surface of the mold (the surface that contacts the resin layer). .

[0003]

However, Japanese Laid-Open Patent Publication No. 4-1 is used.
According to the conventional method described in Japanese Patent No. 44718, the shape of the outermost peripheral portion of the surface of the resin layer (the surface in contact with the mold) is considerably acute depending on the angle between the optical surface of the outer mold and the central axis. Therefore, the vicinity of the outermost peripheral portion of the surface of the resin layer becomes brittle, the vicinity of the outermost peripheral portion of the surface of the resin layer is damaged when the mold and the resin layer are peeled off, or the resin layer within the optically effective diameter is formed along with the peripheral portion. There was a problem of damage. Here, when only the resin layer outside the optically effective diameter is damaged, there is no problem in terms of performance as an optical element, but since the outer peripheral portion of the resin layer can be visually confirmed, it cannot be used as a product.

The present invention has been made in view of such conventional problems, and provides a good composite optical element without damaging the vicinity of the outermost periphery of the resin layer surface when the mold and the resin layer are peeled off. It is an object of the present invention to provide a method for manufacturing a composite optical element that can be manufactured.

[0005]

In order to solve the above-mentioned problems, the present invention is to mount an energy-curable resin on at least one surface of a substrate of an optical element, and use an optical element molding die. In a method for manufacturing a composite optical element, which comprises pressing to form a desired resin layer, curing the resin layer by irradiation of energy, and peeling the cured resin layer from the mold, the effective optical surface of the mold An angle of 15 degrees or more and 45 degrees or less is formed with the central axis on the outside of the diameter, and as it goes away from the central axis, it passes through the outermost peripheral point in the optically effective diameter of the base material and is perpendicular to the central axis. It was decided to use a mold having a shape with a large distance.

Further, according to the present invention, an energy curable resin is placed on at least one surface of a substrate of an optical element,
In the method for producing a composite optical element, the desired resin layer is formed by pressing with an optical element molding die, the resin layer is cured by energy irradiation, and the cured resin layer is peeled from the die. A film made of a substance having a poorer wettability with a resin than the material of the mold is provided outside the effective diameter of the optical surface of the mold, and the outside of the effective diameter of the optical surface of the mold is the central axis.
It has an angle of 5 degrees or more and 55 degrees or less, and has such a shape that the distance from the surface perpendicular to the central axis passes through the point of the outermost peripheral portion within the optically effective diameter of the molding surface of the base material as the distance from the central axis increases. I decided to use a mold.

[0007]

First, the case where the angle .theta. Formed with the central axis of the outer periphery of the optical effective diameter of the mold is 10 degrees will be described with reference to FIG. When the resin placed on the center of the base material 2 is spread by pressing the mold 1, the side surface of the resin layer 3 has a shape as shown in FIG. The intermediate portion of the resin layer 3 is recessed toward the central axis side, as compared with the portion where the mold 1 contacts the mold 1 and the portion where the resin layer 3 contacts the base material 2. At this time, if the contact angle at the outermost peripheral portion where the mold 1 and the resin layer 3 contact each other is θ ₁ , this θ ₁ becomes smaller than 10 degrees, so that the resin layer 3 is separated when the mold 1 and the cured resin layer 3 are peeled off. The outermost peripheral portion of 3 is easily damaged. That is, in order to prevent the outermost peripheral portion of the resin layer 3 from being damaged at the time of peeling, θ must be larger than 10 degrees. Therefore, as a result of repeated examination,
It was found that when θ is 15 degrees or more, the mold 1 and the cured resin layer 3 can be peeled off without damaging the outermost peripheral portion of the resin layer 3.

Next, the case where the angle .theta. Formed with the central axis of the outer periphery of the optical effective diameter of the mold is 50 degrees will be described with reference to FIG.
Here, the method of forming the resin layer 3 is similar to that in the case of FIG. Therefore, the shape of the side surface of the resin layer 3 is similar to that in the case of FIG. The part is recessed toward the central axis. At this time, if the contact angle at the outermost peripheral portion where the mold 1 and the resin layer 3 are in contact is θ ₂ , then θ ₂ should theoretically be larger than when θ is smaller than 50 degrees. However, in reality, the resistance when the resin spreads along the outer periphery of the optically effective diameter of the mold 1 becomes small, so that the resin layer 3
The difference between the outermost peripheral portion of the portion contacting the mold 1 and the intermediate portion of the resin layer 3 is larger than that when θ is smaller than 50 degrees. Therefore, the shape of the outermost peripheral portion where the mold 1 and the resin layer 3 are in contact with each other is sharper and θ ₂ is smaller than that when θ is smaller than 50 degrees, so that when the mold 1 and the cured resin layer 3 are peeled off, the resin layer The outermost peripheral portion of 3 is easily damaged. That is, in order to prevent the outermost peripheral portion of the resin layer 3 from being damaged at the time of peeling, θ must be smaller than 50 degrees. Therefore, as a result of repeated studies, it was found that if θ is 45 degrees or less, the mold 1 and the cured resin layer 3 can be peeled off without damaging the outermost peripheral portion of the resin layer 3.

Next, with reference to FIG. 3, a case will be described in which a substance having a poorer wettability with respect to resin than the mold is provided on the outer periphery of the optical effective diameter of the mold. Here, the method for forming the resin layer 3 is the same as in the case of FIG. 2, and the angle θ formed by the outer peripheral portion of the optical effective diameter of the mold 1 with the central axis is also 50 degrees as in the case of FIG. At this time, when the contact angle at the outermost peripheral portion where the mold 1 and the resin layer 3 are in contact with each other is θ ₃ , the outer peripheral portion of the optically effective diameter of the mold 1 is more wettable by the resin than other parts of the mold 1. Is bad, so Figure 2
In this case, the contact angle θ ₃ is larger than the contact angle θ ₂ . Therefore, as a result of further studies using a Teflon film for the substance having poor wettability, if θ is 55 degrees or less, the mold 1 and the cured resin layer 3 are not damaged without damaging the outermost peripheral portion of the resin layer 3. It turned out that it can be peeled off.

As a result of further study based on the above three results, as shown in FIG. 4, when the angle θ with the central axis of the outer peripheral portion of the optical effective diameter of the mold 1 is 30 degrees, the mold is 1 and resin layer 3
It was found that the contact angle θ _{4 at the} outermost peripheral portion where is in contact with is the largest. Further, when a substance having a wettability lower than that of the mold 1 with respect to the resin is provided on the outer peripheral portion of the optical effective diameter of the mold 1, θ ₄ becomes maximum when θ in FIG. 4 is 35 degrees. It has been found.

Further, since the composite optical element is generally manufactured at room temperature, there is no great difference in the angle of the energy-curable resin used for the manufacture in contact with the mold.
Therefore, the allowable range of θ does not change even if the type of resin changes.

[0012]

First Embodiment First, the configuration will be described. As shown in FIG. 5, the mold 1 is held so as to be vertically movable, the outside of the effective diameter of the optical surface of the mold 1 forms an angle of 15 degrees with the central axis, and the mold 1 moves away from the central axis. Has a conical shape such that the distance from the surface passing through the outermost peripheral portion within the effective diameter and being perpendicular to the central axis is large. Below the mold 1, spherical polishing is performed,
A glass base material 2 whose central axis is the same as that of the mold 1 and whose both surfaces are concave is provided. The base 2 has a molding surface (a surface on which the resin layer is placed) having a radius of curvature of 20 mm and an outer diameter of 25 mm.
Is. In addition, a surface 2a having a width of 1 mm in the radial direction perpendicular to the center axis is provided on the outermost peripheral portion of the molding surface of the base material 2 so as to be axisymmetric with respect to the center axis of the base material 2. There is. A resin layer 3 made of a urethane acrylate-based ultraviolet curable resin is interposed between the mold 1 and the base material 2, and the mold 1, the base material 2 and the resin layer 3 are in close contact with each other. Here, the thickness of the resin layer 3 on the central axis is 0.1 mm and the effective diameter is 2
It is 0 mm. Further, above the surface 2a of the base material 2, a peeling member 4 capable of making surface contact with this surface is provided.

Next, the manufacturing method of this embodiment will be described. As shown in FIG. 6, a required amount of resin 5 is discharged onto the upper surface of the base material 2. Next, as shown in FIG. 7, by lowering the mold 1 to bring it closer to the base material 2, the resin 5 is spread, and the resin 5 is formed at a position where the resin 5 forms the resin layer 3 having a desired thickness. Stop the descent. At this time, the outermost peripheral portion of the surface of the resin layer 3 is in contact with the portion outside the effective diameter of the mold 1. In this state, ultraviolet rays are irradiated from below the base material 2 by means not shown to cure the resin layer 3. As a result, as shown in FIG.
And the contact body in which the resin layer 3 is integrated is formed. Next, as shown in FIG. 9, when the contact body is raised, the peeling member 4 comes into surface contact with the surface 2 a provided on the outer peripheral portion of the base material 2. Then, as shown in FIG. 10, the composite optical element 6 in which the base material 2 and the resin layer 3 are integrated is peeled from the mold 1 easily and instantly.

According to the manufacturing method of this embodiment, since the contact angle at the position where the outermost peripheral portion of the resin layer 3 and the mold 1 contact each other is large to some extent, the resin layer 3 is separated when the mold 1 and the resin layer 3 are peeled off.
The composite optical element 6 without damaging the outermost peripheral portion of the surface
Can be manufactured.

[0015]

Second Embodiment First, the configuration will be described. As shown in FIG. 11, in this embodiment, the mold 1 of the first embodiment is divided into an inner mold 1b and an outer mold 1c that can move up and down independently of each other inside and outside the optically effective diameter. The angle between the optical axis of the outer mold 1c and the central axis is 45 degrees, both sides of the substrate 2 are convex, and the radius of curvature of the molding surface is 100 mm and the outer diameter is 30 m.
m, that a V-shaped groove 2b having a width of 1.5 mm and a depth of 1 mm with which the peeling member 4 can contact is provided on the side surface of the base material 2, and the central axis of the resin layer 3. The upper thickness is 0.2m
m, the effective diameter is 26 mm, the peeling member 4 having a shape capable of surface contact with the V-shaped groove 2 b is provided outside the base material 2, and the peeling member 4 is not shown. This is different from Example 1 in that it can be moved back and forth with respect to the central axis of the base material 2 by the above means. Further, in this embodiment, since the molding surface of the base material 2 is a convex surface, a resin having a viscosity of about 2500 cps is selected so that the resin does not protrude from the outer diameter of the base material 2 during molding. Other configurations are the same as those in the first embodiment. In this embodiment, a resin having a viscosity of 2500 cps is used, but since the contact angle between the mold 1 and the resin does not largely change depending on the type of resin, the radius of curvature and the outer diameter of the molding surface of the base material 2 are different. In this case, by using resins having different viscosities, it is possible to prevent the resin from protruding from the base material when the resin is pressed.

Next, the manufacturing method of this embodiment will be described. This example is different from Example 1 only in the step of separating the mold 1 and the resin layer 3, and therefore only this step will be described below. First,
As shown in FIG. 12, when the mold 1 and the resin layer 3 are peeled off, the peeling member 4 approaches the central axis and comes into surface contact with the V-shaped groove 2 b of the base material 2. Next, as shown in FIG.
By raising the outer mold 1c, the outer mold 1c and the resin layer 3
The portion outside the optically effective diameter of is peeled off. Next, as shown in FIG. 14, the inner mold 1b is raised to raise the inner mold 1b.
b and the portion inside the optically effective diameter of the resin layer 3 are peeled off.

According to the manufacturing method of this embodiment, since the contact angle at the position where the outermost peripheral portion of the resin layer 3 and the mold 1 contact each other is large to some extent, the resin layer 3 is separated when the mold 1 and the resin layer 3 are peeled off.
The composite optical element 6 without damaging the outermost peripheral portion of the surface
Can be manufactured. Further, since the mold 1 is composed of the inner mold 1b and the outer mold 1c which can independently move up and down, the angle formed with the central axis of the outer mold 1c can be changed by changing the conditions, and the inner mold 1b can be changed. Since the outer mold 1c and the outer mold 1c can be separately manufactured, the mold 1 can be easily processed.

[0018]

Third Embodiment First, the configuration will be described. As shown in FIG. 15, in this embodiment, a Teflon (registered trademark) film 1d having a thickness of 10 mm is provided on the optical surface of the outer die 1c of the mold 1 of the second embodiment, and the outer die 1c and the center are formed. The angle formed by the axes is 55 degrees, and the base material 2 is a meniscus lens whose molding surface is concave and the surface opposite to the molding surface is convex, and the radius of curvature of the molding surface is 20.
The other configuration is the same as that of the second embodiment, except that the outer diameter is 0 mm and the outer diameter is 40 mm, the thickness of the resin layer 3 on the central axis is 0.15 mm, and the effective diameter is 35 mm. The manufacturing method of this embodiment is the same as that of the second embodiment.

According to this embodiment, since the contact angle at the position where the outermost peripheral portion of the resin layer 3 and the mold 1 contact each other is large to some extent, the surface of the resin layer 3 is separated when the mold 1 and the resin layer 3 are peeled off. The composite optical element 6 can be manufactured without damaging the outermost peripheral portion. Further, a Teflon film 1d having a lower wettability with respect to resin than the material of the mold on the outside of the optically effective diameter of the mold 1.
Since the outermost peripheral portion of the resin layer 3 is provided in contact with the Teflon film 1d, the contact angle can be made larger than in the case where the mold material and the resin layer 3 are in direct contact. Also, mold 1
Is composed of an inner mold 1b and an outer mold 1c which can be independently moved up and down, the angle formed by the central axis of the outer mold 1c can be changed by changing the conditions, and the inner mold 1b and the outer mold 1c can be changed. Can be manufactured separately, so that the mold 1 can be easily processed.

In this embodiment, the mold 1 is composed of the inner mold 1b and the outer mold 1c which are independently movable up and down, but the mold 1 in which the inner mold 1b and the outer mold 1c are integrated is used. The same effect can be obtained when there is.

Further, in each of the above-described embodiments, only one peeling member for peeling the mold 1 and the resin layer 3 is provided, but the present invention is not limited to this, and the peeling member is not limited to this. It is possible to provide two, three, or a member having an axisymmetric shape with respect to the entire circumference of the base material 2, and similar effects can be obtained.

[0022]

As described above, according to the method for manufacturing a composite optical element of the present invention, since the contact angle at the position where the outermost peripheral portion of the resin layer and the mold contact each other is large to some extent, the mold and the resin Without damaging the outermost peripheral part of the resin layer when peeling the layer,
A good composite optical element can be manufactured, and as a result, the yield as a product is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a manufacturing method of the present invention.

FIG. 2 is a vertical sectional view showing a manufacturing method of the present invention.

FIG. 3 is a vertical cross-sectional view showing the manufacturing method of the present invention.

FIG. 4 is a vertical cross-sectional view showing the manufacturing method of the present invention.

FIG. 5 is a vertical sectional view showing the manufacturing method according to the first embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view showing the manufacturing method of the first embodiment.

FIG. 7 is a vertical cross-sectional view showing the manufacturing method of the first embodiment.

FIG. 8 is a vertical cross-sectional view showing the manufacturing method of the first embodiment.

FIG. 9 is a vertical cross-sectional view showing the manufacturing method of the first embodiment.

FIG. 10 is a vertical cross-sectional view showing the manufacturing method of the first embodiment.

FIG. 11 is a vertical cross-sectional view showing the manufacturing method of the second embodiment of the present invention.

FIG. 12 is a vertical cross-sectional view showing the manufacturing method of the second embodiment.

FIG. 13 is a vertical cross-sectional view showing the manufacturing method of the second embodiment.

FIG. 14 is a vertical cross-sectional view showing the manufacturing method of the second embodiment.

FIG. 15 is a vertical cross-sectional view showing the manufacturing method of the third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 1b Inner mold 1c Outer mold 1d Teflon film 2 Base material 3 Resin layer 4 Separation member 5 Resin 6 Composite optical element

Claims (2)

[Claims] 1. An energy-curable resin is placed on at least one surface of a substrate of an optical element, and a desired resin layer is formed by pressing with an optical element molding die, and the resin is irradiated by energy. In the method for producing a composite optical element, in which a layer is cured and the cured resin layer is peeled from the mold, an angle of 15 degrees or more and 45 degrees or less is formed outside the effective diameter of the optical surface of the mold with the central axis. None, and characterized by using a mold having a shape in which the distance from the surface perpendicular to the central axis through the point of the outermost peripheral portion within the optically effective diameter of the molding surface of the substrate increases as the distance from the central axis increases. Method for manufacturing composite optical element. 2. An energy-curable resin is placed on at least one surface of a base material of an optical element, and a desired resin layer is formed by pressing with an optical element molding die, and the resin is irradiated with energy. In a method of manufacturing a composite optical element in which a layer is cured and a cured resin layer is peeled from the mold, the wettability to a resin is worse than the material of the mold on the outside of the effective diameter of the optical surface of the mold. A film made of a substance is provided, and the outside of the effective diameter of the optical surface of the mold is 15 degrees or more with the central axis 55.
Use a mold that has an angle of less than 4 degrees and that has a shape in which the distance from the surface perpendicular to the central axis increases through the point of the outermost peripheral portion within the optically effective diameter of the molding surface of the substrate as it moves away from the central axis. A method for manufacturing a composite optical element, comprising: