JP2014061664A - Light irradiation device for lens substrate, and method for producing lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light irradiation device for lens substrates, in which the lens substrate can be exposed uniformly to light when the lens substrate is irradiated with light and to provide a method for producing a lens.SOLUTION: The light irradiation device (1) for lens substrates includes: a long light source (111); a substrate holding means (131) for clamping the lens substrate (S) at the position opposed to the long light source; rotating means (132, 133) for rotating the lens substrate; and a repetitive movement means (14) for repetitively moving at least one of the lens substrate and the long light source so that the center of a light quantity distribution to be formed by the long light source is made to pass through, at least, a zone from the center of the lens substrate to one end thereof.

Description

  The present invention relates to a light irradiation apparatus that irradiates light onto a lens substrate for forming a photocured film or the like.

  Conventionally, spectacle lenses are provided with a film such as a hard coat film or a photochromic layer on the surface in order to impart functions. When forming a film on the lens substrate, a method may be employed in which a photocurable film is formed on the lens substrate, and the film is cured by irradiation with light such as ultraviolet rays. In the light irradiation, since the surface of the lens substrate is a curved surface, it is not easy to irradiate light uniformly on the lens substrate. For example, in the case of light irradiation to a spectacle lens having a small curvature radius on the surface, the difference in the amount of light irradiated between the center and the peripheral portion of the spectacle lens may become significant. In that case, the photocured film is slowly or insufficiently cured at the periphery of the lens, and the properties such as the adhesion of the cured film may be non-uniform.

In Patent Document 1, a transmitted light amount adjustment unit is disposed between a light source and a lens substrate, and the amount of light reaching the lens substrate is made uniform by reducing the amount of light shielding from the central portion to the peripheral portion of the transmitted light amount adjustment unit. A method is disclosed. As the transmitted light amount adjusting section, a plurality of holes are provided in a light-shielding substrate, and the transmitted light amounts of the central portion and the peripheral portion are adjusted by changing the area of the holes.
In Patent Document 2, a reflection surface that guides reflected light of a light source from a light source is installed on the lens substrate, the amount of reflected light applied to the peripheral portion of the lens substrate is adjusted, and the central portion and the peripheral portion of the lens substrate are adjusted. Discloses a method for adjusting the difference in the amount of irradiation light.

JP 2011-209408 A JP 2012-3089 A

According to the method of Patent Document 1 or 2, since the lens substrate has various types of curved surfaces, it is necessary to perform complicated adjustment on the transmitted light amount adjustment unit and the reflection surface corresponding to each lens substrate.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens substrate light irradiating device that uniformly irradiates light onto a lens substrate when irradiating light onto the lens substrate, and a method for manufacturing a lens.

That is, the present invention relates to the following [1] to [5].
[1] a long light source;
Substrate holding means for holding the lens substrate at a position facing the long light source;
Rotating means for rotating the lens substrate;
Repetitive operation means for repetitively operating at least one of the lens substrate and the long light source so that the center of the light amount distribution formed by the long light source passes from at least the center to one end of the lens substrate;
A light irradiation device for a lens substrate, comprising:
[2] The lens substrate light irradiating device according to [1], wherein an operation direction of the repetitive operation unit is a direction perpendicular to a rotation axis of the rotation unit.
[3] an external chamber provided with the long light source;
An internal chamber provided in the external chamber, wherein at least a part of a surface facing the long light source is formed of a light transmissive member,
The substrate holding means is installed to hold the lens substrate at a position facing the light source through the light transmitting member;
The light irradiation apparatus for a lens substrate according to [1] or [2], wherein the repetitive operation means repeatedly operates the internal chamber.
[4] The internal chamber includes an inert gas introduction hole, a baffle plate installed in the vicinity of the inert gas introduction hole so that an inert gas flow is not directly applied to the lens substrate, and an inert gas discharge. The light irradiation device for a lens substrate according to any one of [1] to [3], further including a hole.
[5] A method for producing a lens in which a photocurable film formed on a lens substrate is cured by light irradiation with a long light source,
The lens substrate is rotated so that the lens substrate is rotated at a position facing the long light source, and the center of the light quantity distribution formed by the long light source passes from at least the center to one end of the lens substrate. A method for manufacturing a lens, wherein at least one of a long light source is repeatedly operated to emit light from the long light source.

ADVANTAGE OF THE INVENTION According to this invention, when irradiating light on a lens substrate, the light irradiation apparatus for lens substrates which irradiates light uniformly on a lens substrate, and the manufacturing method of a lens can be provided.
When the lens substrate is allowed to stand facing the long light source, a distribution of the irradiation light amount is formed on the lens substrate.
On the other hand, by rotating the lens substrate facing the long light source, it is possible to obtain the uniformity of the irradiation light amount at least at the same distance from the center of the lens substrate. However, if only the lens substrate is rotated, the amount of irradiation light at the central portion increases due to the curved surface of the lens substrate, and the amount of irradiation light at the peripheral portion decreases.
Therefore, in addition to the rotation of the lens substrate, at least one of the lens substrate and the long light source so that the center of the light amount distribution formed by the long light source passes from at least the center of the lens substrate to one end. By repeating the operation, it is possible to adjust the irradiation light amount in the peripheral portion, and to make the irradiation light amount on the lens substrate uniform.

FIG. 1 is a schematic cross-sectional view of a lens substrate light irradiation apparatus 1 according to an embodiment of the present invention. FIG. 2 is a schematic perspective view of the lens substrate light irradiation apparatus 1 according to an embodiment of the present invention. FIG. 3A shows the positional relationship between the rod-shaped light source and the xyz axis, and FIG. 3B is a model diagram showing the distribution of the amount of irradiation light on the x axis in FIG. FIG. 4 is a schematic diagram for explaining the operation of the lens substrate from the viewpoint of the rod-shaped light source side. FIG. 5 is a schematic diagram for explaining the operation of the lens substrate from the viewpoint of the rod-shaped light source side. FIG. 6 is a schematic diagram for explaining a modification of the rotation of the lens substrate. FIG. 7 is a schematic diagram for explaining a modification example of the repetitive operation from the viewpoint of the rod-shaped light source side. FIG. 8 is an explanatory diagram of a section on the lens substrate.

  The light irradiation device for a lens substrate is formed by a long light source, a substrate holding unit that holds the lens substrate at a position facing the long light source, a rotating unit that rotates the lens substrate, and the long light source. Repetitive operation means for repetitively operating at least one of the lens substrate and the long light source so that the center of the light quantity distribution passes from at least the center to one end of the lens substrate. By the rotation and repetitive operation, the difference in the amount of irradiation light between the central portion and the peripheral portion of the lens substrate is adjusted. As a result, the amount of irradiation light on the lens substrate can be made uniform.

The long light source means a light source having a long surface facing the lens substrate or forming a long light amount distribution on the surface facing the light source. As the long light source, for example, a straight tube lamp, a rod light source such as a light source in which a number of light emitting diodes (LEDs) are arranged in a straight line, a U-shaped tube lamp, and a serpentine tube lamp are used. The length of the long light source in the longitudinal direction is preferably selected to be at least larger than the radius of the lens substrate.
For example, in the rod-shaped light source, as shown in FIG. 3, the distribution of the irradiation light amount is formed on the opposing planes. A position showing the highest irradiation light amount on the plane is set as the center of the light amount distribution. That is, in the rod-shaped light source, the center of the linear light amount distribution is formed along the rod shape of the light source.

In the present invention, the repetitive operation is repeated so that the center of the light amount distribution formed by the long light source passes from at least the center to one end of the lens substrate.
The repetitive motion is not particularly limited, and examples thereof include a swing motion and a circular motion. When swinging, it may be reciprocating on a straight line or it may be centrifugal swinging reciprocating on an arc.
The operation direction of the repetitive operation means is preferably a direction perpendicular to the rotation axis of the rotation means.

Examples of the lens substrate include a circular lens substrate for spectacles.
The diameter of the lens substrate is preferably 60 to 80 mm.
An arbitrary base curve (hereinafter sometimes referred to as “BC”) of the lens substrate is used. For example, a base curve of 8 to 10 is used.

  The lens substrate light irradiation device includes an external chamber provided with the long light source, and an internal chamber provided in the external chamber, wherein at least a part of a surface facing the long light source is formed of a light transmitting member. It is preferable to further comprise. Further, it is preferable that the substrate holding means is installed so as to hold the lens substrate at a position facing the light source through the light transmitting member, and the repetitive operation means repetitively operates the internal chamber. . By providing the internal chamber in this manner and rotating the lens substrate in the chamber, it becomes difficult to be affected by the air flow caused by the repetitive operation, so that the photocured film can be easily formed uniformly.

  Although it does not restrict | limit especially as a light transmissive member, When a long light source is an ultraviolet lamp, it is preferable to comprise with the raw material which permeate | transmits ultraviolet light, such as a synthetic quartz.

  The internal chamber includes an inert gas introduction hole, a baffle plate installed in the vicinity of the inert gas introduction hole so that an inert gas flow does not directly hit the lens substrate, and an inert gas discharge hole. Furthermore, it is preferable to have. By providing the means for introducing the inert gas in this way, it is possible to perform photocuring in an inert gas atmosphere and to prevent oxygen inhibition. In particular, by providing a baffle plate, it is possible to prevent the film before curing from being roughened by the flow of inert gas.

  The method for producing a lens of the present invention is a method in which a photocurable film formed on a lens substrate is cured by light irradiation with a long light source. In the manufacturing method, the lens substrate is rotated at a position facing a long light source, and the center of the light amount distribution formed by the long light source passes through at least the center to one end of the lens substrate. Light is emitted from the long light source by repeatedly operating at least one of the substrate and the long light source.

Here, the photocurable film includes a photocurable resin composition. The photocurable resin composition is preferably a photocurable composition that functions as a photochromic layer and a hard coat film after curing.
Examples of the photocurable resin composition include a photo radical curable composition, a photo cation curable composition, and a hybrid curable composition thereof.
Examples of the photo radical curable composition include a composition containing an acrylate compound and an energy ray sensitive radical polymerization initiator.
Although it does not specifically limit as an acrylate compound, A polyfunctional acrylate and a monofunctional acrylate are mentioned. The polyfunctional acrylate is not particularly limited as long as it is a compound having a plurality of acrylate groups, and examples thereof include trifunctional acrylates, dendrimers having a terminal acrylate group, and hyperbranched polymers.
Examples of the photocationic curable composition include a combination of a compound having an epoxy group and a silane compound or a compound having two or more hydroxy groups. As the photoinitiator here, an energy ray sensitive cationic polymerization initiator can be used.
As a photocurable resin composition, it is preferable to have a metal oxide particle further. Examples of the metal oxide include fine particles such as aluminum oxide, titanium oxide, zirconium oxide, and silicon oxide.
45-95 mass% is preferable with respect to a photocurable resin composition, and, as for content of polyfunctional acrylate, 35-90 mass% is preferable. 45-95 mass% is preferable with respect to a photocurable resin composition, and, as for content of the polymeric compound of a photocationic curable composition, 35-90 mass% is preferable. 0.1-10 mass% is preferable with respect to a photocurable resin composition, and, as for content of a photoinitiator, 0.5-5 mass% is more preferable. The content of the metal oxide particles is preferably 5 to 180 parts by mass and more preferably 60 to 150 parts by mass with respect to 100 parts by mass of the total amount of the polyfunctional acrylate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a cross section of a lens substrate light irradiation apparatus 1 according to an embodiment of the present invention. FIG. 2 is a perspective view of the lens substrate light irradiation apparatus 1. In FIG. 2, the external chamber 11 is indicated by a dotted line as a perspective view.
The lens substrate light irradiation apparatus 1 includes an external chamber 11 and an internal chamber 12 provided in the external chamber.
The external chamber 11 has a fixing part 112 for fixing the rod-shaped light source 111 at the upper part of the external chamber, a light shielding part 113 for preventing light from leaking from the side surface of the external chamber, and a pedestal 114. The rod-shaped light source 111 is a straight tubular ultraviolet lamp.

  The internal chamber 12 includes a housing 121 and a light transmission window 122 for taking light into the interior provided on the surface of the housing facing the rod-shaped light source 111. The light transmission window 122 is configured by a light transmission member. The internal chamber 12 has an inert gas introduction hole 125 and an inert gas discharge hole 126 in order to purge an inert gas such as nitrogen. Further, in the vicinity of the inert gas introduction hole 125, a baffle plate 127 is provided from the viewpoint of preventing the surface of the film formed on the lens substrate from being roughened due to the gas flow, when the film is uncured. .

  In the internal chamber 12, a substrate holding part 131 that holds the lens substrate S is provided at a position facing the rod-shaped light source 111. The substrate holding part 131 has a mechanism for holding the lens substrate so that the convex surface of the lens substrate faces the rod-shaped light source 111. The substrate holding part 131 is connected to a rotating shaft 132 that rotates the substrate holding part, and the rotating shaft is further connected to a first drive mechanism 133 including a rotating mechanism.

  The internal chamber 12 is provided on the movable base 14. The movable pedestal 14 includes a pedestal main body 141, a guide rail 142 attached to the pedestal main body so as to be movable in the horizontal direction (x-axis direction in FIG. 1), and a second drive mechanism 143 that swings the pedestal main body in the horizontal direction. And have.

The lens substrate light irradiation device 1 is operated as follows.
A lens substrate S having an uncured photocurable film formed on a convex surface is mounted on the substrate holding part 131 in the internal chamber 12. The lens substrate S is rotated around the rotation shaft 132 by the first drive mechanism 133, and the movable pedestal 14 is further moved laterally (in the x-axis direction in FIG. 1) by the second drive mechanism 143. In this way, while being operated by the first drive mechanism 133 and the second drive mechanism 143, light is irradiated from the rod-shaped light source 111 to cure the photocurable film on the lens substrate S. Since the light irradiation is performed in the external chamber 11, light can be prevented from leaking by the light shielding portion 113, and the safety of work can be improved. Further, the irradiated light reaches the photocurable film on the lens substrate S through the light transmission window 122 provided on the upper portion of the internal chamber 12 and is cured.

  When irradiating light, an inert gas is introduced from the inert gas introduction hole 125 of the internal chamber 12. The air flow of the introduced inert gas collides with the baffle plate 127 and is discharged from the inert gas discharge hole 126 so as not to directly hit the lens substrate. In this way, the inside chamber is purged with the inert gas. Thereby, oxygen inhibition etc. can be prevented by making the inside of the internal chamber generated during light irradiation an inert gas atmosphere.

Hereinafter, the distribution of the irradiation light amount in the lens substrate light irradiation apparatus 1 and the relationship between the rotation of the lens substrate S and the swing operation will be described in detail.
FIG. 3A shows the positional relationship between the rod-shaped light source 111 and the xyz axis, and FIG. 3B is a model diagram showing the distribution of the irradiation light quantity on the x axis in FIG. Thus, on the plane facing the rod-shaped light source, the point closest to the rod-shaped light source (shown in FIG. 3A) is perpendicular to the major axis of the rod-shaped light source (the x-axis direction in FIG. 3A). The distribution of the amount of irradiation light occurs with the light amount center PC at a point orthogonal to the z-axis. Distribution of irradiation light quantity in a direction perpendicular to the major axis of the rod-shaped light source (x-axis direction) at any location in the direction parallel to the major axis of the rod-shaped light source on the surface (y-axis direction in FIG. 3A). Occurs and the center of the light quantity appears linearly in the direction parallel to the major axis of the rod-shaped light source (the y-axis direction in FIG. 3A).

  In addition to the distribution of the irradiation light amount generated based on the properties of the rod-shaped light source, the distribution of the irradiation light amount occurs on the lens substrate surface based on the convex base curve. That is, even in the direction parallel to the major axis of the rod-shaped light source (in the y-axis direction in FIG. 3A), the amount of irradiation light at the central portion of the lens substrate is large and the amount of irradiation light at the peripheral portion is small due to the base curve. .

The lens substrate S is held by the substrate holding part 131 at a position facing the rod-shaped light source 111 with the convex surface facing the rod-shaped light source. Subsequently, the lens substrate S is rotated via the rotation shaft 132. Here, the lens substrate S is rotated about the center of the lens substrate as an axis. Thereby, the irradiation light quantity on the surface of the lens substrate S becomes a uniform irradiation light quantity concentrically from at least the center.
The rotation speed of the lens substrate S is preferably a rotation speed such that the surface of the coating film is not rough depending on the properties of the photocured film, for example, preferably 1 to 3000 ppm, more preferably 5 to 1000 ppm, 10 to 300 ppm is more preferable.

FIG. 4 is a schematic diagram for explaining the repetitive operation of the lens substrate from the viewpoint on the rod-shaped light source side. In the repetitive operation, in addition to the rotation of the lens substrate S, as shown in FIG. 4A, the center PC of the light amount distribution is changed from the center SC of the lens substrate S as shown in FIG. The PC is swung so as to pass to one end of the lens substrate S, and the difference in the amount of irradiation light between the central portion and the peripheral portion of the lens substrate is adjusted, so that the amount of irradiation light on the lens substrate S is made uniform.
The direction of the swing is not particularly limited as long as the center moves so as to pass from at least the center to one end of the lens substrate. For example, as shown in FIG. 4, it may be the swing direction of T1 or the swing direction of T2.
The swaying width is, for example, a width at which the amount of movement in the direction perpendicular to the major axis of the rod-shaped light source becomes the radius r of the lens substrate S. In this case, one end of the swing operation is a position where the center of the irradiation light amount and the center of the lens substrate S coincide (FIG. 4B), and the other end of the swing operation is the center of the irradiation light amount and the lens substrate S. By swinging as a position where one end coincides (FIG. 4A), the amount of irradiation light on the lens substrate can be made uniform.
Further, as shown in FIG. 5, the swing width may be equal to or larger than the same width as the diameter 2r of the lens substrate S, for example. In this case, one end of the swing operation is a position where the center PC of the irradiation light amount and one end of the lens substrate S coincide (FIG. 5A), and the other end of the swing operation is the center of the irradiation light amount and the lens substrate. By swinging as a position where the other end of S coincides (FIG. 5C), it is possible to make the irradiation light amount on the lens substrate uniform.
The speed of swinging is not particularly limited, and it is preferable to operate at such a speed that the surface of the film is not rough, depending on the properties of the photocured film, for example, preferably 1 to 1000 mm / s, 500 mm / s is more preferable, and 10 to 300 mm / s is still more preferable.

(Modification)
FIG. 6 is a schematic diagram for explaining a modification of the rotation of the lens substrate. The rotation of the lens substrate S may be perpendicular to the rod-shaped light source 111 as shown in FIG. 1, but has an inclination with respect to the vertical facing direction as shown in FIG. May be. In this case, the lens substrate light irradiation device 1 is configured by tilting the rotation shaft 132 in the internal chamber 12.

FIG. 7 is a schematic diagram for explaining a modification example of the repetitive operation from the viewpoint of the rod-shaped light source side.
As shown in FIGS. 7A to 7D, the rod-shaped light source 111 is operated on the circular trajectory T3 so that the light quantity center PC passes from one end to the other end of the lens substrate S. You may let them. In this case, the lens substrate light irradiation device 1 is configured such that the guide rail 142 is formed on a circular track and the movable base 14 is operated on the guide rail 142 by the second drive mechanism.

  The present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

In a glass container, 1-methoxy-2-propanol as a solvent, metal oxide (silica sol, trade name PGM-ST, manufactured by Nissan Chemical Industries Ltd.) and silane coupling agent (trade name: KBM-503, Shin-Etsu Chemical) Made by Co., Ltd.) and stirred at 55 ° C. and 450 rpm to coat the metal oxide with a silane coupling agent.
Subsequently, 50 parts by mass of a polyfunctional acrylate {pentaerythritol acrylate (trade name M-306, manufactured by Toa Gosei Co., Ltd., triacrylate <1 hydroxyl group in one molecule> 65 to 70%), dendritic aliphatic compound (Trade name SIRIUS-501, made by Osaka Organic Chemical Industry Co., Ltd.) 50 parts by mass} 100 parts by mass, 100 parts by mass of the metal oxide coated with the silane coupling agent, and a leveling agent (trade name: Y-7006) , Polyoxyalkylene / dimethylpolysiloxane copolymer manufactured by Toray Dow Corning Co., Ltd.) and a reaction initiator (trade name: IRGACURE 184, manufactured by Ciba Specialty Chemicals Co., Ltd.) were prepared.
EYNOA base material (trade name, manufactured by HOYA Co., Ltd., polythiourethane resin, refractive index 1.67, center thickness 1.0 mm, lens power 0.00) is used as the lens substrate, and the above-mentioned photocuring is applied to each substrate. The functional resin composition solution was applied with a spin coater (Mikasa Co., Ltd.).
The lens substrate light irradiation apparatus 1 was used to irradiate the above lens substrate under the conditions shown in Table 1. The rocking was performed such that the rocking direction was perpendicular to the long axis of the rod-shaped light source, and the rocking width was 2r with respect to the radius r of the lens substrate. Evaluation was performed according to the following adhesion evaluation method.

(Evaluation of adhesion)
100 cross-cuts at 1.5 mm intervals on the coating film, and after the adhesive tape (registered trademark: cello tape, manufactured by Nichiban Co., Ltd.) is firmly attached to the cross-cut, the adhesive tape is rapidly peeled off and cured. As shown in FIG. 8, the lens substrate was divided into nine sections on the basis of the center PC of the initial light amount distribution as shown in FIG.
◎. There were no eyes peeled off.
○. The number of eyes peeled off was 1 or more and 2 or less.
Δ. The number of peeled eyes was 3 or more and 4 or less.
×. Five or more eyes were peeled off.

  The lens substrate light irradiation apparatus of the present invention can provide a lens substrate light irradiation apparatus that uniformly irradiates light onto the lens substrate, and a method for manufacturing a lens. For this reason, according to the apparatus of this invention, a hard-coat film | membrane etc. can be provided on a lens board | substrate using photocurable resin.

1: Lens substrate light irradiation device 11: External chamber 111: Rod light source 112: Fixed portion 113: Light shielding portion 114: Base 12: Internal chamber 121: Housing 122: Light transmission window 125: Inert gas introduction hole 126: Non Active gas discharge hole 127: Baffle plate 131: Substrate holding part 132: Rotating shaft 133: First drive mechanism 14: Movable base 141: Base body 142: Guide rail 143: Second drive mechanism S: Lens substrate SC: Lens center PC : Center of light intensity

Claims (5)

A long light source;
Substrate holding means for holding the lens substrate at a position facing the long light source;
Rotating means for rotating the lens substrate;
Repetitive operation means for repetitively operating at least one of the lens substrate and the long light source so that the center of the light amount distribution formed by the long light source passes from at least the center to one end of the lens substrate;
A lens substrate light irradiation device comprising:   The light irradiation apparatus for a lens substrate according to claim 1, wherein an operation direction of the repetitive operation unit is a direction perpendicular to a rotation axis of the rotation unit. An external chamber provided with the long light source;
An internal chamber provided in the external chamber, wherein at least a part of a surface facing the long light source is formed of a light transmissive member,
The substrate holding means is installed to hold the lens substrate at a position facing the light source through the light transmitting member;
The light irradiation apparatus for a lens substrate according to claim 1, wherein the repetitive operation means repeatedly operates the internal chamber.   The internal chamber includes an inert gas introduction hole, a baffle plate installed in the vicinity of the inert gas introduction hole so that an inert gas stream does not directly hit the lens substrate, an inert gas discharge hole, The lens substrate light irradiation device according to claim 1, further comprising: A method for producing a lens in which a photocurable film formed on a lens substrate is cured by light irradiation with a long light source,
The lens substrate is rotated so that the lens substrate is rotated at a position facing the long light source, and the center of the light quantity distribution formed by the long light source passes from at least the center to one end of the lens substrate. A method for manufacturing a lens, wherein at least one of a long light source is repeatedly operated to emit light from the long light source.