JPH09141678A - Manufacture of composite optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an air bubble liable to cause the deterioration of an optical performance in the resin layer of a manufactured composite optical device by changing a section in which a resin comes into contact with a molding die at a low speed. SOLUTION: The optical face 1a of a molding die 1 is brought into contact with the top part 5a of a resin by moving the molding die 1 at a speed of about 0.1mm/sec. A section in which the molding die 1 is moved at this speed is between the distance h (2.7-0.04T)mm and the lower limits of a variation (2.5-0.04T)mm. Therefore, by moving the molding die 1 at a low speed (0.1mm/ sec) only in this section, the optical face 1a of the molding die 1 comes into contact the resin 5, so that no air bubbles may be mixed into the resin 5. T deg.C is an ambient temperature and h is the distance between the molded face of a basic material 2 on a central axis and the top part 5(a) of the resin 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite type optical element in which a resin layer is formed on a base material of an optical element.

[0002]

2. Description of the Related Art Conventionally, when a composite type optical element is manufactured, when a resin discharged onto a molding surface of a substrate is brought into contact with an optical surface of a mold (a surface pressing the resin), bubbles are generated in the resin. It is a well-known fact that it is easily mixed. Therefore, in order to prevent the inclusion of air bubbles, for example, the invention described in Japanese Patent Application Laid-Open No. 5-8231 is disclosed.

The above invention is a method of bringing the optical surface of the mold into contact with the resin on the substrate at a low speed. Further, even after the optical surface of the mold contacts the resin, the pressing of the mold must be continued until the resin has a desired resin layer shape. Even at this time, it is a well-known fact that bubbles are trapped in the resin when pressed at a high speed. Therefore, according to the above-mentioned invention, although the pressure is not as low as that at the time of contact, the pressing is still performed at a low speed until the desired resin layer shape is formed.

[0004]

The resin discharged onto the molding surface of the base material has a different viscosity depending on the ambient temperature.
Therefore, when the amount of discharged resin is constant, the distance between the molding surface of the base material and the top of the discharged resin on the central axis varies depending on the ambient temperature. Therefore, the position where the optical surface of the mold and the top of the resin discharged onto the molding surface of the base material come into contact with each other differs depending on the ambient temperature.

However, in the above prior art,
There is no description about how to control the contact position between the optical surface of the mold and the top of the resin. Of course, by setting a wide range where it is expected that the optical surface of the mold and the top of the resin will contact, it is possible to prevent air bubbles from entering when the optical surface of the mold and the top of the resin contact. You can do it. However, when the optical surface of the mold and the top of the resin contact each other, it is necessary to move the mold at the lowest speed.
It has the drawback of increasing costs. Further, if the temperature of the entire equipment is controlled, the position where the optical surface of the mold and the top of the resin contact each other does not change, but this causes a significant cost increase.

An object of the present invention is to provide a composite optical element which can minimize the extension of the tact time at the time of manufacturing even if the ambient temperature changes, and in which bubbles are not mixed in the resin layer. It is to provide a manufacturing method.

[0007]

According to a first aspect of the present invention, an energy curable resin is supplied to the surface of a base material of an optical element, a mold having a desired optical surface is brought into contact with the resin to spread the resin,
In a method of manufacturing a composite optical element in which a desired resin layer is formed between a substrate surface and a mold, energy is applied to the composite type optical element, and a section in which the mold contacts the resin at a low speed is changed according to an ambient temperature. And a method for manufacturing a composite optical element.

The details of the invention of claim 1 will be described below.
As shown in FIG. 1, under the condition of the ambient temperature of 25 ° C., the resin 5 is applied to the molding surface of the base material 2 having a radius of curvature of 100 mm on the molding surface, the other surface being flat and having a diameter of 25 mm. ．
A case will be described in which 1 g is discharged and a mold (not shown) having a desired optical surface is brought into contact with the resin 5 to spread the resin 5 on the base material 2.

In the above case, the distance h between the molding surface of the substrate 2 and the top of the resin 5 on the central axis is about 1.6 mm.
However, in the manufacture of the composite optical element, the resin discharge amount varies and the stop position varies when the mold is moved. Therefore, it is necessary to give a certain width to the section where the mold is moved at a low speed. . So, when we proceeded with the study,
When the optical surface of the moving mold comes into contact with the top of the resin 5, a low-speed section required to prevent air bubbles from entering is the optical surface of the mold and the substrate 2 on the central axis when the ambient temperature is 25 ° C.
It was found that the distance from the molding surface of was from the position of 1.7 mm to the position of 1.5 mm. Therefore, the mold speed may be set so as to move at 0.1 mm / sec in this section, and the time is 2 sec.

However, when the ambient temperature changes, the resin 5
Since the viscosity of the resin also changes, the shape of the resin 5 discharged onto the base material 2 changes. That is, the distance h between the molding surface of the base material 2 and the top of the resin 5 on the central axis also changes. For example, when the ambient temperature is 20 ° C., the distance h between the molding surface of the base material 2 and the top of the resin 5 on the central axis is about 1.8 mm.
When the ambient temperature is 30 ° C., the distance h between the molding surface of the base material 2 and the top of the resin 5 on the central axis is about 1.4 mm.
Becomes

It has been found from a study that the distance h changes substantially linearly within the above temperature range (20 ° C. to 30 ° C.). Therefore, when the ambient temperature is 20 ° C., in the section where the mold is moved at a low speed, the distance between the optical surface of the mold and the molding surface of the base material 2 on the central axis is 1 in consideration of the range of variation described above. It is necessary to set from the position of 1.9 mm to the position of 1.7 mm. Also, the ambient temperature is 30 ° C.
In the case of No. 1, in the section where the mold is moved at a low speed, the distance between the optical surface of the mold and the molding surface of the base material 2 on the central axis from the position of 1.5 mm is 1. Three
It is necessary to set up to the position of mm.

Therefore, when the atmosphere temperature is T ° C. in the range of 20 ° C. to 30 ° C., the section where the mold must be moved at a low speed is located on the central axis from the molding surface of the base material 2 to the mold. The distance to the optical surface is from the position of (2.7-0.04T) mm to the position of (2.5-0.04T) mm. Then, when an attempt is made to manufacture a composite optical element in a place where the ambient temperature may change in the range of 20 ° C. to 30 ° C., the gap between the optical surface of the mold and the molding surface of the base material 2 on the central axis. The mold must be moved from the position of 1.9 mm to the position of 1.3 mm at 0.1 mm / sec. Therefore, the total time for the die to move at 0.1 mm / sec is 6 sec.

On the other hand, the ambient temperature is 20 ° C to 30 ° C.
Even if an attempt is made to manufacture a composite type optical element in a range that may change within the range of 1, the range in which the mold moves at 0.1 mm / sec can be limited by measuring the ambient temperature as needed. . That is, in the section in which the mold is moved at 0.1 mm / sec when the ambient temperature is T ° C., the distance between the optical surface of the mold and the molding surface of the substrate 2 on the central axis is (2.7-0. The movement of the mold is controlled so as to be from the position of 04T) mm to the position of (2.5-0.04T) mm. By this control, the time for moving the mold at 0.1 mm / sec is constant at 2 sec regardless of the ambient temperature. That is, the takt time hardly changes even when the ambient temperature during manufacturing changes.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIGS. 2 to 7 are manufacturing process diagrams showing the present embodiment. As shown in FIG. 2, a required amount of the energy curable resin 5 is discharged onto the glass base material 2 having concave surfaces on both sides. The radius of curvature of the molding surface of the base material 2 is 100 mm,
The radius of curvature of the non-molding surface (the surface on which the resin is not placed) is 20 m
m, the outer diameter is 25 mm. At the outermost peripheral portion of the molding surface of the base material 2, an end surface 2a perpendicular to the central axis and having a radial width of 2 mm is provided so as to be axially symmetrical with respect to the central axis of the base material 2. The required amount of the resin 5 has been determined in advance, and its weight is 0.1 g.

Next, as shown in FIG.
It is moved at a high speed until just before it comes into contact with the top 5a. However, the relationship between the ambient temperature T ° C. and the distance h (mm) between the molding surface of the base material 2 and the resin top portion 5a on the central axis is a result of examination, and as a result, h = 2.6−0.04T. It has been found. Therefore, the upper limit of the variation is set in the section in which the mold 1 is moved at high speed, and the distance between the optical surface 1a of the mold 1 and the molding surface of the substrate 2 on the central axis is (2.7-0.04T) mm. Up to the position. The mold 1 has an optical surface 1a having a radius of curvature of 90 mm and a diameter of 20 mm, and the central axis thereof is the same as the central axis of the substrate 2 and is held so as to be vertically movable.

Next, as shown in FIG.
The optical surface 1a of the mold 1 is brought into contact with the top portion 5a of the resin 5 by moving it at 1 mm / sec. The section in which the mold 1 is moved at this speed is between the distance h (2.7-0.04T) mm and the lower limit of the variation (2.5-0.04T) mm. The die 1 is operated at low speed (0.1 mm
/ Sec), the optical surface 1a of the mold 1 and the resin 5 always come into contact with each other. Further, since the mold 1 and the resin 5 are brought into contact with each other at a low speed, air bubbles are not mixed in the resin 5. Furthermore, the time required for this step is constant at 2 seconds regardless of the ambient temperature, and the takt time during manufacturing does not become extremely long.

Then, as shown in FIG. 5, the thickness of the resin layer 3 on the central axis is a desired value (0.1 m in this embodiment).
The mold 1 is moved until it becomes m). The moving speed at this time does not need to be as low as 0.1 mm / sec,
It may be about 0.5 mm / sec. In this state,
The resin layer 3 is cured by irradiating energy from below the base material 2 by means not shown. At the time when the irradiation of energy is completed, the contact body in which the mold 1, the base material 2 and the resin layer 3 are integrated is formed.

Next, as shown in FIG. 6, when the contact member is raised, the peeling member 4 previously provided above a part of the end surface 2a of the base material 2 is removed from the end surface 2a of the base material 2. Make surface contact with. However, the end surface 2 of the base material 2 is provided below the peeling member 4.
It is assumed that a flat surface 4a parallel to a is formed. Then, the weight is first concentrated on the end surface 2a of the base material 2 where the flat surface 4a of the peeling member 4 is in contact, and then the weight is applied.
Disperse throughout. Further, if the contact body is continuously raised in this state, as shown in FIG.
The composite optical element 6 in which the resin layer 3 and the resin layer 3 are integrated is peeled off.

According to this embodiment, even if the ambient temperature changes, air bubbles that would deteriorate the optical performance are not mixed in the resin layer of the manufactured composite optical element, and at the time of manufacturing. The takt time does not increase.

(Second Embodiment) FIGS. 8 to 11 are manufacturing process diagrams showing the present embodiment. As shown in FIG. 8, a required amount of the energy curable resin 5 is discharged onto the glass base material 2 whose concave surface is a concave surface and whose non-molding surface (a surface on which the resin is not placed) is a convex surface. The radius of curvature of the molding surface of the base material 2 is 20 m
m, the radius of curvature of the non-molded surface is 50 mm, and the outer diameter is 25 mm. At the outermost peripheral portion of the molding surface of the base material 2, an end surface 2a perpendicular to the central axis and having a radial width of 2 mm is provided so as to be axially symmetrical with respect to the central axis of the base material 2. The required amount of the resin 5 has been determined in advance, and its weight is 0.14 g.

Next, as shown in FIG.
It is moved at a high speed until just before it comes into contact with the top 5a. However, the relationship between the ambient temperature T ° C. and the distance h (mm) between the molding surface of the base material 2 and the resin top portion 5a on the central axis is h = 2.15-0.03T as a result of the examination. It has been found. Therefore, in the section where the mold 1 is moved at high speed, the upper limit of the variation is set, and the distance between the optical surface 1a of the mold 1 and the molding surface of the base material 2 on the central axis is (2.25-0.03T) mm.
Up to the position. The mold 1 has an optical surface 1a with a radius of curvature of 18 mm and a diameter of 20 mm, and its central axis is the same as the central axis of the substrate 2 and is held so as to be vertically movable.

Next, as shown in FIG. 10, the mold 1 is moved at 0.1 mm / sec to bring the optical surface 1a of the mold 1 into contact with the top 5a of the resin 5. The section in which the mold 1 is moved at this speed is the distance h (2.25-0.03T).
mm is the lower limit of variation (2.05-0.03
T) up to mm. By moving the mold 1 at a low speed (0.1 mm / sec) only in this section, the optical surface 1a of the mold 1 and the resin 5 are always in contact with each other. Further, since the mold 1 and the resin 5 are brought into contact with each other at a low speed, air bubbles are not mixed in the resin 5. Furthermore, the time required for this process is constant at 2 seconds regardless of the ambient temperature,
The takt time at the time of manufacturing does not become extremely long.

Then, as shown in FIG. 11, the thickness of the resin layer 3 on the central axis has a desired value (0.1 m in the present embodiment).
The mold 1 is moved until it becomes m). The moving speed at this time does not need to be as low as 0.1 mm / sec,
It may be about 0.5 mm / sec. The subsequent steps from the step of curing the resin layer 3 to the step of peeling the mold 1 and the resin layer 3 are the same as those in the first embodiment, and the description thereof will be omitted.

According to the present embodiment, even if the ambient temperature changes, air bubbles that would deteriorate optical performance are not mixed in the resin layer of the manufactured composite optical element, and at the time of manufacturing. The takt time does not increase.

(Third Embodiment) FIGS. 12 to 15 are manufacturing process diagrams showing the present embodiment. As shown in FIG.
A required amount of the energy curable resin 5 is discharged onto the glass substrate 2 having concave surfaces on both sides. The radius of curvature of the molding surface of the base material 2 is 30 mm, the radius of curvature of the non-molding surface (the surface on which the resin is not placed) is 70 mm, and the outer diameter is 40 mm. An end face 2a perpendicular to the central axis and having a radial width of 1.5 mm is provided on the outermost peripheral portion of the molding surface of the substrate 2 so as to be axially symmetric with respect to the central axis of the substrate 2. There is. The required amount of the resin 5 has been determined in advance, and its weight is 0.2 g.

Next, as shown in FIG. 13, the mold 1 is moved at a high speed until just before contacting the top 5a of the resin 5.
However, the relationship between the atmospheric temperature T ° C. and the distance h (mm) between the molding surface of the base material 2 and the resin top 5a on the central axis is h = 3.5-0.06T as a result of the examination. It has been found. Therefore, the upper limit of the variation is set in the section where the mold 1 is moved at high speed, and the distance between the optical surface 1a of the mold 1 on the central axis and the molding surface of the substrate 2 is (3.6-0.06T) mm. Up to the position. The mold 1 has an optical surface 1a having a radius of curvature of 24 mm and a diameter of 36 mm, and its central axis is the same as the central axis of the substrate 2 and is held so as to be movable up and down.

Then, as shown in FIG. 14, the mold 1 is moved at 0.1 mm / sec to bring the optical surface 1a of the mold 1 into contact with the top 5a of the resin 5. The section in which the mold 1 is moved at this speed is the distance h (3.6-0.06T) m.
The lower limit of the variation from m is (3.4-0.06T) m
Up to m. The die 1 is operated at low speed (0.1
(mm / sec), the optical surface 1a of the mold 1 and the resin 5 always come into contact with each other. Further, since the mold 1 and the resin 5 are brought into contact with each other at a low speed, air bubbles are not mixed in the resin 5. Furthermore, the time required for this step is constant at 2 seconds regardless of the ambient temperature, and the takt time during manufacturing does not become extremely long.

Then, as shown in FIG. 15, the thickness of the resin layer 3 on the central axis is a desired value (0.1 m in this embodiment).
The mold 1 is moved until it becomes m). The moving speed at this time does not need to be as low as 0.1 mm / sec,
It may be about 0.5 mm / sec. The subsequent steps from the step of curing the resin layer 3 to the step of peeling the mold 1 and the resin layer 3 are the same as those in the first embodiment, and the description thereof will be omitted.

According to this embodiment, even if the ambient temperature changes, air bubbles that would deteriorate optical performance are not mixed in the resin layer of the manufactured composite optical element, and at the time of manufacture, The takt time does not increase.

[0030]

The effect of the present invention is that even if the ambient temperature changes, air bubbles that would deteriorate optical performance are not mixed in the resin layer of the manufactured composite optical element, and at the time of manufacturing. Tact time does not increase.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram showing the first embodiment.

FIG. 2 is a manufacturing process diagram showing the first embodiment.

FIG. 3 is a manufacturing process diagram showing the first embodiment.

FIG. 4 is a manufacturing process diagram showing the first embodiment.

FIG. 5 is a manufacturing process diagram showing the first embodiment;

FIG. 6 is a manufacturing process diagram showing the first embodiment;

FIG. 7 is a manufacturing process diagram showing the first embodiment;

FIG. 8 is a manufacturing process diagram showing the second embodiment.

FIG. 9 is a manufacturing process diagram showing the second embodiment.

FIG. 10 is a manufacturing process diagram showing the second embodiment.

FIG. 11 is a manufacturing process diagram showing the second embodiment.

FIG. 12 is a manufacturing process diagram showing the third embodiment.

FIG. 13 is a manufacturing process diagram showing the third embodiment.

FIG. 14 is a manufacturing process diagram showing the third embodiment.

FIG. 15 is a manufacturing process diagram showing the third embodiment.

[Explanation of reference numerals] 1 mold 2 base material 3 resin layer 4 peeling member 5 resin

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 11:00

Claims (1)

[Claims] 1. An energy-curable resin is supplied to the surface of a base material of an optical element, a mold having a desired optical surface is brought into contact with the resin to spread the resin, and a desired resin is provided between the base material surface and the mold. In a method of manufacturing a composite optical element in which a resin layer is formed and then irradiated with energy, a section of a mold contacting the resin at a low speed is changed according to an ambient temperature. Method.