JP2011031492A - Gasket for manufacturing lens containing functional film and method of manufacturing plastic lens using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket capable of handling various shaped functional films and contributing to productivity improvement of a functional lens. <P>SOLUTION: The gasket is used for manufacturing the lens containing the functional film. The gasket is formed of a cylindrical body having two openings for fitting and inserting a first mold for forming one side surface of the lens and a second mold for forming the other side surface respectively. The cylindrical body has a holdable recessed part capable of moving a peripheral edge part of the functional film which is formed by a first projecting band and a second projecting band projected from the inner wall surface over the entire circumference in the circumferential direction, over the entire circumference in the circumferential direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a gasket used for producing a plastic lens including a functional film such as a light control film and a polarizing film by cast polymerization, and a plastic including a functional film by cast polymerization using the gasket. The present invention relates to a method of manufacturing a lens.

  By providing a functional film such as a light control film and a polarizing film between lens base materials, it is performed to give desired performance to various lenses such as spectacle lenses. As a method of manufacturing a functional lens including such a functional film, a method of injecting and polymerizing a lens raw material solution on both sides of the functional film in a state where the functional film is disposed in the cavity of the mold (casting) (Referred to as Patent Documents 1 to 3).

JP 2009-45886 A JP 2004-1362 A JP 2008-93825 A

In any of the methods described in Patent Documents 1 to 3, in order to prevent the functional film from moving in the cavity, a portion for sandwiching and fixing the functional film is provided on the gasket constituting the mold. However, as a result of the study by the present inventors, it has been found that the above method has the following problems.
(1) In the above method, an opening (injection port) for injecting the lens raw material liquid is usually provided in one of two spaces separated by a functional film. For this reason, in order to allow the lens raw material liquid to flow into the other space, a gap is provided in addition to the portion where the functional film of the gasket is sandwiched and fixed, and the lens raw material liquid is allowed to flow through this gap. However, since the flow rate from such a limited gap is small, it has been an obstacle to injecting the raw material liquid into the cavity in a short time.
(2) Since the functional film is clamped and fixed, it is difficult to adjust the position after assembly.
(3) Since the functional film is usually manufactured to have the same curvature as the lens curvature, the shape of the functional film differs depending on the type of lens. In order to sandwich and fix such films having different shapes, it is necessary to design a gasket according to the shape, which causes a decrease in productivity and an increase in cost, particularly when manufacturing a small amount of various types of lenses.

  Therefore, an object of the present invention is to provide a gasket that can be applied to functional films of various shapes and can contribute to improvement of productivity of functional lenses.

As a result of intensive studies to achieve the above object, the present inventors have held the functional film with a gasket in a state of being freely movable over the entire periphery of the peripheral portion, thereby the above (1) to ( It was found that the problem 3) can be solved. This is due to the following reason.
(1) Since the functional film is arranged in a state where it can have a gap with the gasket over the entire periphery, the raw material liquid can be flown in a large amount from this gap, and the speed is higher than that when flowing from a slight gap. Can be injected.
(2) Since the functional film can be freely moved even in the state where it is disposed on the gasket, the position of the functional film after assembly can be adjusted.
(3) Since the portion of the gasket that holds the functional film need not be sandwiched and fixed, the gasket having the same shape can be used for various types of functional films.
Further, according to the study by the inventors of the present application, the functional film held in the above state did not cause a large positional shift during the injection of the lens raw material liquid. This is considered to be because when the lens raw material liquid is injected into the cavity, the functional film is lifted by buoyancy and is maintained stably in this state thereafter. In the past, it was thought that the functional film had to be clamped and fixed. However, the fact that the functional film can be stably placed in the cavity without clamping is a new fact found by the present inventors. is there.
The present invention has been completed based on the above findings.

That is, the above object was achieved by the following means.
[1] A gasket used for manufacturing a lens including a functional film,
A cylindrical body having two openings for inserting and inserting a first mold for forming one surface of the lens and a second mold for forming the other surface,
The cylindrical body is formed by a first projection band and a second projection band that are provided on the inner wall surface so as to protrude over the entire circumference in the circumferential direction. The peripheral edge of the functional film is movable over the entire circumference in the circumferential direction. The gasket having a recess capable of being held.
[2] The gasket according to [1], wherein the cylindrical body is configured by fitting the outer peripheral portion of the second cylindrical member into the inner peripheral portion of the first cylindrical member.
[3] One of the first protrusion band and the second protrusion band is included in the first cylindrical member, and the other is included in the second cylindrical member.
The gasket according to [2], wherein the concave portion is formed by fitting the inner peripheral portion and the outer peripheral portion.
[4] One of the first projecting band and the second projecting band is located on the inner wall surface of the first cylindrical member, and the other projecting band extends over the entire end surface of the second cylindrical member. The gasket according to [3], wherein the gasket is a protruding protrusion.
[5] A first mold for forming one surface of the lens and a second mold for forming the other surface are formed in the two openings of the gasket according to any one of [1] to [4]. Forming a cavity including the concave portion by inserting each of them;
In the cavity, disposing a functional film in a state where the peripheral portion is held movably over the entire circumference in the concave portion,
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens.
[6] The first mold for forming one surface of the lens and the second mold for forming the other surface are respectively inserted into the two openings of the gasket according to [3] or [4]. Forming a cavity including the recess,
With the functional film disposed on either the first cylindrical member or the second cylindrical member, the outer peripheral portion of the second cylindrical member is fitted into the inner peripheral portion of the first cylindrical member. Thus, the functional film is held in a recessed portion formed by the protrusion band included in the first cylindrical member and the protrusion band included in the second cylindrical member so that the peripheral edge portion can move over the entire circumference. Arranged in a
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens.
[7] The cavity has two spaces separated by the functional film,
The gasket has an injection port for injecting the plastic lens raw material liquid into any one of the two spaces.
Injecting the plastic lens raw material liquid from the injection port, and injecting the plastic lens raw material liquid from the space provided with the injection port to the other space through the gap between the peripheral edge of the functional film and the concave portion, [5] The method for producing a plastic lens according to [6].
[8] The method includes positioning the mold by bringing a projecting side surface of a projecting band provided on the cylindrical body of the gasket into contact with a peripheral surface of the molding surface of the first mold or the second mold. The manufacturing method of the plastic lens in any one of-[7].

  According to the present invention, productivity of a plastic lens (functional lens) including a functional film can be improved.

It is sectional drawing of the shaping | molding die containing the gasket concerning 1 aspect of this invention. It is the top view seen from the opening 8A side in the state which does not insert a mold in the gasket shown in FIG. 1, and the top view seen from the opening 8B side. It is sectional drawing of the cylindrical member 6 shown in FIG. 1, and sectional drawing which shows the state which inserted mold 5A in opening 8A of the cylindrical member 6. FIG. It is sectional drawing which shows the state which has arrange | positioned the functional film 2 in sectional drawing of the cylindrical member 7 shown in FIG. 1, and the opening 8B of the cylindrical member 7. FIG. It is sectional drawing which shows the one aspect | mode of the cylindrical member which comprises a gasket. It is explanatory drawing which shows the process of inject | pouring a plastic lens raw material liquid to the shaping | molding die shown in FIG. It is a graph which shows the measurement result of the position of the polarizing film in each polarizing lens produced in the example. It is a graph which shows thickness distribution of the polarizing lens produced in the Example.

The present invention relates to a gasket used for manufacturing a lens including a functional film. The gasket of the present invention comprises a cylindrical body having two openings for inserting and inserting a first mold for forming one surface of the lens and a second mold for forming the other surface, respectively. The cylindrical body is formed by a first protrusion band and a second protrusion band projecting on the inner wall surface over the entire circumference in the circumferential direction, and holds the periphery of the functional film movably over the entire circumference. It has a possible recess.
Hereinafter, although the gasket of this invention is demonstrated based on drawing, this invention is not limited to the following aspect.

  FIG. 1 is a cross-sectional view of a mold including a gasket according to one embodiment of the present invention. In FIG. 1, a mold 1 is inserted into a gasket that is a cylindrical body formed by assembling a first cylindrical member 6 and a second cylindrical member 7, and two openings 8A and 8B of the gasket. Molds 5A and 5B. In the cavity 9 closed by the gasket and the two molds, a lens-shaped molded body is obtained by injecting and curing the lens raw material liquid. Here, as shown in FIG. 1, by placing the functional film 2 in the cavity before the injection of the lens raw material liquid, the lens substrate and the functional film can be integrally molded in the mold.

  The gasket (cylindrical body) shown in FIG. 1 has two protruding bands 3 and 4 on the inner wall surface. A plan view of the gasket shown in FIG. 1 viewed from the opening 8A side without inserting a mold is shown in the upper view of FIG. 2, and a plan view of the gasket shown in FIG. As shown in FIG. 2, the protrusion bands 3 and 4 are provided on the inner wall surface of the gasket over the entire circumference. As shown in FIG. 1, a functional film is hold | maintained at the recessed part (part surrounded by the dotted line in FIG. 1) formed by these two protrusion bands. This recessed part can hold | maintain a functional film so that a movement over the perimeter of the circumferential direction is possible. That is, the functional film 2 is held in the cavity 9 so as to be freely movable up and down and up and down without being clamped and fixed by the protrusion bands 3 and 4. In the embodiment shown in FIG. 1, the functional film 2 has a peripheral portion of one surface in contact with the protrusion band 4 and a lower portion in contact with the bottom surface of the recess. For example, if the mold is inclined, the functional film 2 is in the recess. And the contact state is released. The functional film arranged in such a state can be changed in position by tweezers or the like even after being arranged in the cavity. Therefore, position adjustment after assembly is possible. In addition, as described above, the functional film held in the above state did not cause a large positional shift during the injection of the lens raw material liquid. This is considered to be because when the lens raw material liquid is injected into the cavity, the functional film is lifted by buoyancy, and is thereafter stably maintained in this state. In addition, sandwiching the functional film may cause wrinkles and creases, especially when the functional film is thin. Therefore, holding the functional film without interposing it may cause wrinkles or creases in the functional film. This is also advantageous in that the occurrence can be prevented.

  In order to hold the functional film in a movable state, the distance between the two protrusion bands constituting the recess is made wider than the film thickness of the functional film and the inner diameter of the gasket is made wider than the outer diameter of the functional film. do it. For example, the interval between the protrusion bands is set to be about 1.02 to 12.5 times the film thickness of the functional film, and the inner diameter of the gasket in the recess is set to 1.001 to 1. It is preferable that the size is about 05 times. Further, in order to hold the functional film in a predetermined position, it is preferable to form the concave portion in a tapered shape whose width becomes narrower toward the opening portion. For example, the tapered recess can be formed by inclining at least one protrusion band toward the other protrusion band. In the embodiment shown in FIG. 1, the protrusion band 3 has an angle of 90 ° with the inner wall surface of the gasket, and the protrusion band 4 is formed in a state inclined about 30 ° toward the protrusion band 3. 3. It is also possible to incline the protrusion band 4 with respect to the other protrusion band, and to incline the protrusion band 3 toward the protrusion band 4. The tilt angle is not particularly limited as long as the functional film can be held.

The gasket included in the mold shown in FIG. 1 is composed of two cylindrical members 6 and 7, but it is not essential that the gasket of the present invention has a two-part configuration. It can also be a gasket made of a single cylindrical member having In the gasket having such a configuration, the functional film can be disposed in the concave portion by, for example, pressing the functional film with tweezers or the like. In this case, however, slight wrinkles and scratches may occur when the functional film is pushed in. On the other hand, in the case of a two-part gasket, it is only necessary to assemble two cylindrical members in a state where a functional film is arranged on one cylindrical member as will be described later. This is advantageous in that the film can be arranged.
Hereinafter, the two-part gasket will be described in more detail.

  3 is a sectional view (left figure) of the cylindrical member 6 (hereinafter also referred to as “inner cylindrical member”) 6 shown in FIG. 1 and a sectional view showing a state in which the mold 5A is inserted into the opening 8A of the cylindrical member 6 (FIG. (Figure on the right). 4 is a cross-sectional view (left view) of the cylindrical member (hereinafter also referred to as “outer cylindrical member”) 7 shown in FIG. 1 and a cross-sectional view showing a state in which the functional film 2 is disposed in the opening 8B of the cylindrical member 7. (Right figure). The gasket (cylindrical body) shown in FIG. 1 is configured by fitting the outer peripheral portion of the outer cylindrical member into the inner peripheral portion of the inner cylindrical member.

  As described above, in order to construct a gasket by assembling two cylindrical members with a functional film disposed on one cylindrical member, one of the two protrusion bands is provided on the inner cylindrical member, and the other is provided on the outer cylindrical member. It is preferable. Thus, if the outer peripheral portion of the inner cylindrical member is fitted into the inner peripheral portion of the outer cylindrical member in a state where the functional film is disposed on one cylindrical member side, the functionality is reduced in the concave portion formed by the two protruding bands. A film can be placed.

  The inner cylindrical member shown in FIG. 3 has a protruding band 4 protruding from the entire circumference of the end surface, and the outer cylindrical member shown in FIG. 4 has a protruding band 3 protruding on the inner wall surface thereof. The protrusion band 3 in FIG. 4 is provided with a stepped portion (portion surrounded by a dotted line), and this stepped part contacts the protrusion band 3 of the inner cylindrical member to position the inner cylindrical member, It plays the role which determines the space | interval of the recessed part formed of two protrusion bands. Alternatively, the outer cylindrical member is not provided with a stepped portion, and a projection band 4 is provided on the inner wall surface of the inner cylindrical member as shown in FIG. It is also possible to adjust the interval between the recesses.

  Each cylindrical member can be provided with a holding portion for positioning and holding the mold. This holding part can be, for example, a protrusion or a protrusion band provided on the inner wall surface of the cylindrical member. Or the protrusion band for forming the said recessed part can also serve as the holding | maintenance part for positioning holding | maintenance of a mold. In the cylindrical member shown in FIG. 3, the protrusion band 4 plays a role of positioning the mold 5 </ b> A by bringing one protrusion side surface into contact with the peripheral edge of the molding surface of the mold 5 </ b> A. Thereby, the role which controls the space | interval of mold 5A and a functional film can also be played.

  For example, as shown in FIG. 3, the outer peripheral portion of the inner cylindrical member 6 in which the mold 5 </ b> A is arranged is arranged on the outer cylindrical member 7 in which the functional film 2 is arranged on the opening side into which the inner cylindrical member is inserted as shown in FIG. 4. The molding die shown in FIG. 1 can be configured by inserting and inserting the mold 5B into the other opening of the outer cylindrical member. Alternatively, after assembling the two cylindrical members, the two molds may be respectively inserted into the openings, or the two cylindrical members may be assembled with the two molds being respectively inserted into the openings. In order to adjust the position of the functional film after assembling, it is preferable to insert one mold after assembling the two cylindrical members as described above. It is preferable that the inner cylindrical member and the outer cylindrical member have such a shape that the outer peripheral portion of the inner cylindrical member and the inner peripheral portion of the outer cylindrical member can be in close contact with each other so that the injected lens raw material liquid does not flow out after the assembly. . In addition, each cylindrical member is manufactured by injection molding or the like from an elastic resin such as ethylene vinyl acetate copolymer, polyethylene, polypropylene, polyethyl acrylate, silicon rubber, or a mixture of polypropylene and ethylene propylene rubber. Can do. Similarly, a gasket made of a single member can be produced from an elastic resin by injection molding or the like.

  Since the gasket of the present invention described above holds the functional film without sandwiching it, the functional film having various curvatures can be held by a single-shaped gasket without the need to design and manufacture the gasket for each functional film. Can do. For example, a functional film having a curvature of about 2 to 5 base curves can be handled by a single type of gasket. In addition, a functional film for a lens having a complicated surface shape such as a progressive power lens or a toric lens is usually manufactured to have this complicated surface shape. Therefore, in the conventional method for sandwiching the functional film, it is necessary to individually design and manufacture gaskets having sandwiching and fixing portions corresponding to these complicated surface shapes according to the surface shape. On the other hand, according to the gasket of the present invention, since it is not necessary to provide a clamping and fixing part, it is possible to deal with a functional film having the above complicated surface shape by a simple gasket shape.

Furthermore, the present invention relates to a method for producing a plastic lens including a functional film using the gasket. The method for producing a plastic lens of the present invention includes the following two aspects. The following aspect 1 uses the gasket of the present invention, and the following aspect 2 uses the gasket of the present invention comprising a cylindrical body composed of the aforementioned inner cylindrical member and outer cylindrical member. Hereinafter, modes 1 and 2 are also referred to as the production method of the present invention.
(Aspect 1)
By inserting and inserting the first mold for forming one surface of the lens and the second mold for forming the other surface into the two openings of the gasket of the present invention, the cavity including the concave portion is formed. Forming,
In the cavity, disposing a functional film in a state where the peripheral portion is held movably over the entire circumference in the concave portion,
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens.
(Aspect 2)
A first lens for forming one surface of the lens in the two openings of the gasket of the present invention constructed by fitting the outer peripheral portion of the second cylindrical member into the inner peripheral portion of the first cylindrical member. Forming a cavity including the recess by fitting and inserting a mold and a second mold for forming the other surface,
With the functional film disposed on either the first cylindrical member or the second cylindrical member, the outer peripheral portion of the second cylindrical member is fitted into the inner peripheral portion of the first cylindrical member. Thus, the functional film is held in a recessed portion formed by the protrusion band included in the first cylindrical member and the protrusion band included in the second cylindrical member so that the peripheral edge portion can move over the entire circumference. Arranged in a
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens.
Hereinafter, the production method of the present invention will be described in more detail.

  Two molds (first mold and second mold) used in the production method of the present invention have a molding surface for forming an optical functional surface of a plastic lens. For example, two molds, one of which is a convex surface (also called a lower mold) having a molding surface on the convex surface side where the rear surface (concave surface) of the plastic lens is to be formed, and the other is a concave surface to form the front surface (convex surface) of the plastic lens. It can be a combination of concave molds (also called upper molds) having a molding surface on the side. The mold shown in FIG. 1 includes a pair of molds in the above combination. However, the mold used in the present invention is not limited to the above combination, and a mold corresponding to a desired lens shape may be selected and used. The inner diameter of the cylindrical body of the gasket may be substantially the same as or slightly smaller than the outer diameter of each mold that is inserted into the opening. Further, the mold attached to the cylindrical body may be clamped with a spring or the like in a direction to be pushed into the cylindrical body from both sides as necessary, and fixed to the gasket. As described above, it is preferable to dispose the functional film in the recess before fitting at least one mold because the position of the functional film can be adjusted. The distance between the molding surfaces of the two molds corresponds to the thickness of the plastic lens to be molded including the functional film. The thickness of the plastic lens to be molded is, for example, about 1 to 30 mm, but is not limited to the above range. Further, as described above, it is also preferable to position the mold by bringing the protrusion side surface of the protrusion band provided on the gasket into contact with the peripheral edge of the first mold or the second mold. In the embodiment shown in FIG. 1, the mold 5 </ b> A is positioned by bringing the protrusion side surface of the protrusion band 4 into contact with the peripheral edge of the molding surface of the mold 5 </ b> A.

  A functional film is disposed in the formed cavity before the injection of the lens raw material liquid. Details of the method of arranging the functional film are as described above. As described above, when a gasket composed of a two-part cylindrical body is used, the outer peripheral portion of the inner cylindrical member is placed outside with the functional film disposed on either the inner cylindrical member or the outer cylindrical member. The functional film is placed in a recessed portion formed by a protrusion band included in each cylindrical member by being inserted into the inner peripheral portion of the cylindrical member in a state where the peripheral portion is held movably over the entire circumference. (Aspect 2) is preferable. For example, to form the mold shown in FIG. 1, the outer periphery of the second cylindrical member (inner cylindrical member) with the functional film disposed on the inner peripheral portion of the first cylindrical member (outer cylindrical member). By inserting a part into the inner peripheral part, a recess formed by a projecting band located on the inner wall surface of the first cylindrical member and a projecting band projecting over the entire end surface of the second cylindrical member, It is preferable to arrange the functional film in a state where the peripheral portion is held movably over the entire circumference.

  As a functional film arrange | positioned at the said recessed part, various functional films, such as a light control film and a polarizing film, can be mentioned, What is necessary is just to select the functional film according to the desired performance which should be provided to a lens. These functional films can be obtained as commercial products or can be formed by a known method. Although the film thickness of a functional film is not specifically limited, For example, it is about 0.05-50 micrometers. As described above, it is preferable to set the interval between the two protrusion bands forming the concave portion in which the functional film is disposed according to the film thickness of the functional film. Moreover, the specific gravity of the functional film generally used for producing the functional lens is smaller than the specific gravity of the plastic lens raw material liquid. As shown in the examples described later, in the gasket of the present invention, the reason why the functional film is not greatly displaced even though the functional film is not sandwiched and fixed is that when the plastic lens raw material liquid is injected into the cavity, this raw material liquid It is considered that a functional film having a lower specific gravity is lifted by buoyancy and is maintained stably thereafter.

  After forming a cavity including a recess in which the functional film is disposed, a plastic lens raw material liquid is injected into the cavity. The lens raw material liquid to be injected into the cavity can usually contain raw material monomers, oligomers and / or prepolymers of various polymers constituting a plastic lens base material, preferably a plastic lens base material for spectacle lenses. A mixture of two or more monomers can also be included to form The plastic lens raw material liquid contains a polymerizable (curable) component, and is molded into a lens shape by being polymerized (cured) in the cavity. The curable component may be a thermosetting component or a photocurable component, but in the casting polymerization, a thermosetting component is usually used. If necessary, a catalyst selected according to the kind of monomer can be added to the lens raw material liquid. The lens raw material liquid may also contain various commonly used additives.

  Specific examples of the lens raw material liquid include, for example, a copolymer of methyl methacrylate and one or more other monomers, a copolymer of diethylene glycol bisallyl carbonate and one or more other monomers, and a copolymer of polyurethane and polyurea. Examples thereof include a raw material liquid capable of polymerizing a coalescence, polycarbonate, polystyrene, polyvinyl chloride, unsaturated polyester, polyethylene terephthalate, polyurethane, polythiourethane, a sulfide resin using an ene-thiol reaction, a vinyl polymer containing sulfur, and the like. Of the above, urethane is preferred as the curable component, but is not limited thereto. The injection of the lens raw material liquid into the cavity can be performed by introducing the plastic lens raw material liquid into the cavity from the injection port provided in the gasket, as in normal casting polymerization.

  In the manufacturing method of the present invention, the lens raw material liquid is injected in a state where the functional film is disposed in the cavity. Therefore, the cavity has two spaces separated by the functional film. The lens raw material liquid is usually injected into one of the two spaces from an injection port provided in the gasket. This point will be described with reference to FIG.

FIG. 6 is an explanatory view showing a process of injecting the plastic lens raw material liquid into the mold shown in FIG.
In a normal functional lens, a functional film is disposed at a position close to the object side. The distance between the molding surface that forms the optical function surface on the object side and the functional film is usually set to about 0.2 to 1.0 mm. Also in the embodiment shown in FIG. 6, the functional film 2 is disposed at a position close to the mold 5 </ b> A side (upper mold side) that forms the optical function surface on the object side. The space 9-2 formed by the mold 5A and the functional film is narrower than the space 9-1 formed by the mold 5B (lower mold) that forms the optical functional surface on the eyeball side and the functional film 2. In order to facilitate the injection operation and shorten the injection time, it is preferable to inject the plastic lens raw material liquid into the space 9-1. Therefore, in the embodiment shown in FIG. 6, in order to inject the plastic lens raw material liquid into the space 9-1, the gasket 1 is provided with an injection port 10 on the space 9-1 side. Therefore, the plastic lens raw material liquid M introduced from the injection port 10 is first introduced into the space 9-1. Here, since the functional film 2 is held in the concave portion of the gasket 1 so as to have a space all around and in the front-rear direction, the plastic lens raw material liquid M injected into the space 9-1 is It can flow into the space 9-2 formed by the mold 5A and the functional film 2 through the gap between the peripheral edge portion and the concave portion of the inner wall surface of the gasket. Moreover, the movement of air from one space to the other space is also possible through this gap. In this way, the plastic lens raw material liquid and air can be moved through the gap over the entire circumference in the circumferential direction of the functional film, compared with the case where the raw material liquid is introduced from a limited space as in the conventional method. Thus, the difference in the injection speed of the lens raw material liquid M between the space 9-1 and the space 9-2 can be reduced, and the injection speed of the lens raw material liquid M from the space 9-1 to the space 9-2 can be increased.

  Next, after the injection of the lens raw material liquid into the cavity, the injected lens raw material liquid is heated, irradiated with light, etc., to cause a curing reaction of the curable component contained in the lens raw material liquid, and to form a lens-shaped molded body Can be obtained. Curing reaction conditions (for example, heating temperature raising program) are not particularly limited, and may be determined according to the type of lens raw material liquid to be used. After the curing process is completed, the two molds that are in close contact with the lens are separated (released) by a known method, so that a functional film is formed between the two lens substrates corresponding to the spaces 9-1 and 9-2. It is possible to obtain a plastic lens (functional lens) having Various functionalities such as hard coat film, antireflection film, water repellent film, ultraviolet absorption film, infrared absorption film, photochromic film, antistatic film, etc. are further applied on the functional lens obtained after release. A film can also be laminated | stacked by the well-known film-forming method.

  Through the above steps, a plastic lens including a functional film can be obtained with high productivity. The obtained functional lens can be suitably used as various lenses such as spectacle lenses.

  In the following, the present invention will be further explained by examples. However, this invention is not limited to the aspect shown in the Example.

1. Manufacture of Polarized Lens As described above, the outer peripheral portion of the inner cylindrical member 6 assembled with the mold 5A is inserted into the inner peripheral portion of the outer cylindrical member 7 with the polarizing film disposed on the outer cylindrical member 7 side. As a result, the mold shown in FIG. 6 was assembled. Thereby, the polarizing film 2 was arrange | positioned at the recessed part formed of the two protrusion bands 3 and 4 as shown in FIG. The thickness of the polarizing film is 30 μm, the distance between the protrusion band 3 and the protrusion band 4 at the opening of the recess is 0.04 mm, the outer diameter of the polarizing film is 67 mm, and the inner diameter of the gasket composed of two cylindrical members is 67 at the recess. 0.1 mm. When the mold was moved up, down, left and right in this state, the polarizing film was freely movable while being held in the recesses in the mold. For example, for a functional film having a thickness of 30 to 40 μm and an outer diameter of 67 to 88 mm, the interval between the two protrusion bands in the recess opening is set to about 0.04 to 0.5 mm, and the inner diameter of the gasket is set to the recess Is preferably about 67.1 to 90 mm. Next, the mold 5B was fitted into the opening on the outer cylindrical member 7 side to form a cavity. A lens raw material solution containing a thermosetting urethane monomer was injected into the formed cavity, and the monomer was cured by heat polymerization using a predetermined polymerization program. The mold was released from the cured lens after polymerization. After the mold release, annealing treatment was performed with a predetermined program.
The above process was repeated to produce a total of eight meniscus polarizing lenses having a polarizing film therein.

2. Position measurement of polarizing film in polarizing lens With respect to the eight polarizing lenses obtained in the above, the position from the object side surface to the polarizing film was measured at nine points shown in FIG. The results are shown in FIG.
As shown in FIG. 7, the position of the polarizing film was within 0.3 to 1.0 mm from the object side surface at any measurement point. From this result, it can be seen that the polarizing film did not cause a large positional shift in the cavity during the injection of the lens raw material liquid, although the polarizing film was not sandwiched and fixed by the gasket. As described above, this is presumed to be because the polarizing film was stabilized by buoyancy.

3. Evaluation of castability 1. A total of 24 polarizing lenses were produced in the same manner as described above, and the thickness (CT) at the geometric center of the obtained polarizing lens was measured with a thickness gauge. The results are shown in FIG.
If defective injection of the lens raw material liquid into the object-side space partitioned by the polarizing film in the cavity occurs, the thickness of the obtained lens will vary greatly, but as shown in FIG. The variation in the thickness of the polarizing lens is about 1 mm, and it can be confirmed that the thickness accuracy is good. Moreover, as a result of visually observing each obtained lens, the millet defect was not observed.
From the above results, it was shown that the mold used in the examples had good castability.

  The present invention is useful in the field of manufacturing various functional lenses such as polarizing lenses.

DESCRIPTION OF SYMBOLS 1 Gasket 2 Functional film 3 Protrusion band 4 Protrusion band 5A, 5B Mold 6 Inner cylindrical member 7 Outer cylindrical member 8A, 8B Mold insertion opening 9 Cavity 10 Inlet M Plastic lens raw material liquid

Claims (8)

A gasket used to manufacture a lens including a functional film,
A cylindrical body having two openings for inserting and inserting a first mold for forming one surface of the lens and a second mold for forming the other surface,
The cylindrical body is formed by a first projection band and a second projection band that are provided on the inner wall surface so as to protrude over the entire circumference in the circumferential direction. The peripheral edge of the functional film is movable over the entire circumference in the circumferential direction. The gasket having a recess capable of being held. The gasket according to claim 1, wherein the cylindrical body is configured by fitting an outer peripheral portion of the second cylindrical member into an inner peripheral portion of the first cylindrical member. One of the first protrusion band and the second protrusion band is included in the first cylindrical member, and the other is included in the second cylindrical member.
The gasket according to claim 2, wherein the concave portion is formed by fitting the inner peripheral portion and the outer peripheral portion. One of the first protrusion band and the second protrusion band is located on the inner wall surface of the first cylindrical member, and the other protrusion band protrudes over the entire end surface of the second cylindrical member. The gasket according to claim 3, wherein the gasket is a protruding band. The first mold for forming one surface of the lens and the second mold for forming the other surface are respectively inserted into the two openings of the gasket according to claim 1. Forming a cavity including the recess,
In the cavity, disposing a functional film in a state where the peripheral portion is held movably over the entire circumference in the concave portion,
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens. By inserting and inserting the first mold for forming one surface of the lens and the second mold for forming the other surface into the two openings of the gasket according to claim 3 or 4, Forming a cavity including a recess,
With the functional film disposed on either the first cylindrical member or the second cylindrical member, the outer peripheral portion of the second cylindrical member is fitted into the inner peripheral portion of the first cylindrical member. Thus, the functional film is held in a recessed portion formed by the protrusion band included in the first cylindrical member and the protrusion band included in the second cylindrical member so that the peripheral edge portion can move over the entire circumference. Arranged in a
Injecting a plastic lens raw material liquid into the cavity, and polymerizing the plastic lens raw material liquid in the cavity to obtain a lens-shaped molded body including a functional film;
Of manufacturing a plastic lens. The cavity has two spaces separated by the functional film,
The gasket has an injection port for injecting the plastic lens raw material liquid into any one of the two spaces.
Injecting the plastic lens raw material liquid from the injection port, and injecting the plastic lens raw material liquid from the space provided with the injection port to the other space through the gap between the peripheral edge of the functional film and the concave portion, The manufacturing method of the plastic lens of Claim 5 or 6. The method according to claim 5, further comprising positioning the mold by bringing a projecting side surface of a projecting band provided on the cylindrical body of the gasket into contact with a peripheral surface of the molding surface of the first mold or the second mold. The manufacturing method of the plastic lens of any one of Claims.