JPH05150196A - Contact lens - Google Patents

Abstract

PURPOSE:To obtain a contact lens having high durability and satisfactory reactivity with a living body by forming resin layers on the surfaces of a meniscoid hard plastic member having lens function in one body. CONSTITUTION:Resin layers 32a, 32b are formed on optical functional faces 30a, 30b as the surfaces of a meniscoid hard plastic member 30 having lens function. The resin layers 32a, 32b are made of resin curable with active energy beams such as UV curing resin (resin contg. urethane modified acrylate and acrylate as monomer components or UV curing silicone resin). The resin has relatively high hydrophilic property and excellent reactivity to a living body. The resin is previously mixed with a dithizone or spiropyrane pigment so that the resin layers 32a, 32b have light controlling property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact lens in which a resin layer is integrally molded on the surface of a hard plastic member.

[0002]

2. Description of the Related Art It has been widely known that contact lenses include hard lenses and soft lenses.

[0003]

However, in the above-mentioned conventional contact lenses, although the hard lenses are excellent in durability, they are inferior in terms of bioreactivity (for example, hydrophilicity). there were. On the other hand, soft lenses, on the other hand, are superior in terms of biological reactivity,
There was a problem that it was inferior in terms of durability. Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a contact lens having high durability and good bioreactivity.

[0004]

In order to solve the above-mentioned problems and achieve the object, the contact lens of the present invention has a resin layer integrally formed on the surface of a meniscus-shaped hard plastic member having a lens function. It is characterized by being molded. Further, in the contact lens according to the present invention, the resin layer is made of an active energy ray curable resin. Further, in the contact lens according to the present invention, the resin layer has a dimming property.

[0005]

As described above, since the contact lens according to the present invention is constructed, the surface of the meniscus-shaped glass member made of a highly durable glass material has a resin material having a better bioreactivity than the hard plastic material. By forming the resin layer made of, it is possible to realize a contact lens having high durability and good bioreactivity.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 and 2 show a procedure for molding a contact lens according to an embodiment. 1 and 2, the contact lens 3
Reference numeral 3 denotes a meniscus-shaped hard plastic member 30 on which optically functional surfaces 30a and 30b are provided with resin layers 32a and 32b having a dimming property, which is a kind of so-called replica lens. First, before explaining the contact lens 33, referring to FIG. 1, the resin layer 32a,
The mold 11 for forming 32b will be described.

The mold 11 is placed on a supporting substrate 10 which is supported in a horizontally extending state in a main body of a manufacturing apparatus (not shown) for manufacturing the contact lens 33. Specifically, on the support substrate 10, a substantially cylindrical mold member 12 that constitutes the main part of the mold 11 is placed with its central axis aligned with the vertical line. A molding surface 12a for transferring a predetermined shape to the surface of the resin layer 32a is formed on the end surface. A substantially cylindrical support member 14 having an inner peripheral surface that fits with the outer peripheral surface of the mold member 12 is mounted on the outer side of the mold member 12. Support member 14
A support for supporting the hard plastic member 30 above the optical plastic surface 30a of the hard plastic member 30 by a distance that defines the thickness of the resin layer 32a from the molding surface 12a of the mold member 12. The surface 14a is formed.

Here, the supporting surface 14a protrudes from the edge portion of the molding surface 12a of the mold member 12 by a protrusion amount h as shown in the figure, and the protrusion amount h defines the thickness of the resin layer 32. The value of the protrusion amount h is determined by the resin layer 32.
Is set to have a predetermined thickness (for example, 30 μm). A cylindrical positioning portion 14b is formed on the outer peripheral portion of the support surface 14a at the upper end of the support member 14 so as to project upward from the support surface 14a. The inner peripheral surface 14c of the positioning portion 14b has an inner diameter that fits with the outer peripheral surface of the hard plastic member 30. By fitting the outer peripheral surface of the hard plastic member 30 to the inner peripheral surface 14c, the center of the optical axis of the hard plastic member 30 can be accurately aligned with the center of the molding surface 12a.

On the other hand, the hard plastic member 30 has its upper and lower surfaces processed into a spherical shape, and has a meniscus shape. Then, the contact lenses 33 are completed by forming the resin layers 32b and 32a on the upper and lower optical function surfaces 30b and 30a of the inner portion of the diameter d1 which is slightly smaller than the outer shape of the hard plastic member 30. Next, a method of manufacturing the contact lens of one example will be described with reference to FIGS. 1 and 2.

First, in FIG. 1, with the hard plastic member 30 removed from the support member 14, the resin material is supplied onto the molding surface 12 a of the mold member 12. Here, the resin material to be supplied is an active energy ray-curable resin. In particular, to mold the contact lens 33,
As the active energy ray-curable resin material, for example, an ultraviolet-curable resin (urethane-modified acrylate and a resin containing acrylate as a monomer component, or ultraviolet-curable silicone) is suitable. These resin materials have relatively high hydrophilicity and excellent bioreactivity.

Further, a pigment such as dithizone or spiropyran is mixed in the resin material so that the molded resin layer 32a (32b) has a dimming property.
In addition, an aspherical shape is formed on the molding surface 12a in order to correct aberrations, and this aspherical shape is transferred to the resin layer 32a (32b).

Next, the hard plastic member 30 is fitted inside the positioning portion 14b of the support member 14 and placed on the support member 14. When the hard plastic member 30 is thus placed on the support member 14, the outer peripheral edge of the lower surface of the hard plastic member 30 is in contact with the support surface 14a of the support member 14, and the hard plastic member 30 is also in contact. The outer peripheral surface 30d is fitted to the inner peripheral surface 14c of the positioning portion 14b. Therefore, the hard plastic member 30 is accurately positioned with respect to the mold member 12 with respect to the direction along the optical axis and the direction orthogonal to the optical axis.

When the hard plastic member 30 is placed on the support member 14, the hard plastic member 30 is used.
The optical function surface 30a of FIG. 2 spreads the resin material over the entire surface of the molding surface 12a. At this time, this placement process is performed carefully so that bubbles are not mixed into the resin material. is there. Hard plastic member 30 to support member 1
When the step of mounting on the resin 4 is completed, the resin material is then irradiated with an active energy ray to cure the resin material and form the resin layer 32a. At this time, when an ultraviolet curable resin is used as the resin material, of course,
Ultraviolet rays are irradiated as active energy rays. Then, after the resin layer 32a is completely cured, the hard plastic member 30 is released from the mold 11. This completes the molding of the resin layer 32a on one surface of the contact lens 33.

Next, as shown in FIG. 2, the mold member 12 shown in FIG. 1 is replaced with the optical function surface 30 of the hard plastic member 30.
The mold member 22 for forming the resin layer 32b on b is replaced. Then, after the resin material is supplied again onto the molding surface 22a of the mold member 22, as shown in the figure, the hard plastic member 3
0 is placed on the support member 14. In this state, the resin layer 32b is irradiated with ultraviolet rays as active energy rays through the hard plastic member 30 to cure the resin layer 32b. Then, after the resin layer 32b is completely cured, the hard plastic member 30 is released from the mold 22. Above,
The contact lens 33 as shown in FIG. 3 is completed.

The present invention can be applied to modifications and variations of the above embodiments without departing from the spirit of the invention. For example, in the above-described embodiment, the case where the ultraviolet curable resin is used as the active energy ray curable resin has been described, but an X-ray curable resin or an infrared curable resin may be used. Further, although the resin material is described as being supplied only to the mold member, the resin material may be supplied to both the surface of the mold member and the surface of the hard plastic member.

[0016]

As described above, according to the contact lens of the present invention, the surface of the meniscus-shaped hard plastic member made of a hard plastic material having high durability is provided with a resin material having a better bioreactivity than the hard plastic material. By forming the resin layer made of, it is possible to realize a contact lens having high durability and good bioreactivity.

[Brief description of drawings]

[Figure 1]

FIG. 2 is a diagram showing a method of manufacturing a contact lens according to an example.

FIG. 3 is a diagram showing a shape of a contact lens of one example.

[Explanation of symbols]

 10 Support Substrate 11 Type 12, 22 Type Member 14 Support Member 30 Hard Plastic Member 32a, 32b Resin Layer 33 Contact Lens

Claims (3)

[Claims] 1. A contact lens, wherein a resin layer is integrally molded on the surface of a meniscus-shaped hard plastic member having a lens function. 2. The contact lens according to claim 1, wherein the resin layer is made of an active energy ray curable resin. 3. The contact lens according to claim 1, wherein the resin layer has a dimming property.