JP2009098457A - Contact lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact lens having a novel structure, which can be easily manufactured and easily and surely permits wearing, removing and searching when missing without impairing the deformation characteristics of the lens. <P>SOLUTION: A lens central portion 32 is provided with an optical part 14, and the circumference of the optical part 14 is provided with a peripheral part 16. Further, magnetic metal powder 40 is made to exist internally in a dispersed state in a prescribed region of the peripheral part 16, and a visually recognizable mark 38 is formed by the dispersion region of the magnetic metal powder 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a contact lens of a soft type, a hard type, or a combination of those elements, and more particularly to a contact lens that can be easily and reliably searched for when a lens is attached, removed, or lost. .

  As is well known, when wearing a contact lens, place the contact lens on the finger of one hand, open your eyes wide with the other hand, and place the contact lens on the eye surface. Wear it.

  On the other hand, when removing contact lenses, in the case of soft contact lenses, remove the lenses by directly picking them from the left and right with your fingers, or attach your fingers to the eyelids and push the lens between the upper and lower eyelids. Remove. In the case of a hard contact lens, the lens is removed by pushing out the lens with the eyelid by blinking while pulling the end of the eye toward the outer side (ear side).

  By the way, wearing and removing these contact lenses requires a certain degree of familiarity, and it has not been easy for users who are shallow after starting to use the contact lenses. Even for experienced users, soft contact lenses can be easily damaged by gripping them directly with their fingers, and hard contact lenses can be damaged if they fail to receive the lens pushed out of their eyes during removal. There was a risk of crashing or losing the floor. Furthermore, in any type of lens, the finger touches the lens directly when worn, so that bacteria attached to the finger may enter the eye through the lens.

  Thus, for example, Patent Document 1 (Japanese Utility Model Laid-Open No. 7-1418) discloses a contact lens in which a metal plate is embedded in the lens. In this way, since the lens can be attracted by applying a magnetic attraction force by a magnet to the metal plate, the lens can be easily removed. At the same time, for example, even when the lens is dropped, the lens can be sucked with a magnet, so that the lens can be easily searched.

  However, in the contact lens described in Patent Document 1, since the metal plate is embedded, there is a possibility that the original deformation characteristics of the contact lens may be hindered by the large rigidity of the metal, particularly along the corneal shape. It has been difficult to apply to soft contact lenses that are assumed to be deformed. Even with hard contact lenses that are difficult to deform, it is difficult to process a metal plate with high precision so as to correspond to a lens shape that is molded into a thin film shape corresponding to the wearer's cornea surface shape. Since there is a problem that it is difficult to handle a metal plate when a metal plate as thin as a lens is embedded in the lens, it is not realistic.

  Patent Document 2 (Japanese Utility Model Laid-Open No. 6-68029) discloses a contact lens in which metal particles are embedded and embedded. Since such a contact lens can be attracted by using a magnetic attraction force, it is easy to find the lens as in the lens described in Patent Document 1. However, it is very difficult to embed metal particles in a lens.

Japanese Utility Model Publication No. 7-1418 Japanese Utility Model Publication No. 6-68029

  Here, the present invention has been made in the background as described above, and the problem to be solved is that it can be easily manufactured and can be mounted and removed without impairing the deformation characteristics of the lens. It is an object of the present invention to provide a contact lens having a novel structure capable of more easily and surely searching when lost.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, according to the first aspect of the present invention, in a contact lens in which an optical part is provided at the center of the lens and a peripheral part is provided around the optical part, a predetermined region of the peripheral part is provided. The magnetic metal powder is contained in a dispersed state, and a visible mark is formed by the dispersed region of the magnetic metal powder.

  In the contact lens having the structure according to this aspect, the magnetic metal powder is contained in the peripheral portion, and therefore, the lens can be attracted using a magnetic attractive force. Therefore, it can be worn close to the eye while the lens is attracted to the magnet, or removed from the eye by pulling the magnet close to the lens worn on the eye, making wearing and removal easier Can be done. And since such wearing and removal can be performed by handling the magnet which attracted the lens, wearing and removal can be performed more reliably, and the possibility of missing the lens can be reduced. At the same time, since it can be worn and removed without directly touching the lens, hygiene can be improved. Furthermore, even when the lens is dropped on the floor surface for some reason, the lens can be sucked with a magnet, so that the lens can be found more easily.

  In particular, in a contact lens having a structure according to the present embodiment, such magnetic metal powder is incorporated in a peripheral portion that does not substantially affect the optical characteristics of the lens. It is also avoided to damage. Here, “internal” means that the magnetic metal powder is present in various forms such as mixed or scattered in the contact lens material constituting the peripheral portion, and the magnetic metal powder is exposed on the lens surface. Alternatively, it may be completely embedded in the lens material without being exposed on the lens surface.

  In addition, in a contact lens having a structure according to the present embodiment, a visible mark is formed by the dispersed region of the magnetic metal powder. As a result, not only does the appearance of the lens not be impaired, but rather, by forming a mark, for example, it is possible to identify whether the lens is to be worn on the left or right eye, or toric lens or bifocal lens. It is possible to identify the circumferential position of a lens that requires circumferential positioning, or to display management information such as the lens manufacturing number or lot number. In other words, according to the present invention, it is possible to provide a marked contact lens that can be easily and reliably searched for wearing, removing, or losing. And since a mark is formed with magnetic metal powder, it becomes possible to form a minute mark. Furthermore, even when the surface of the mark is exposed on the lens surface, it is easy to form the mark surface along the lens surface. As a result, the lens surface can be formed smoothly, and the mark may disappear due to wear due to repeated scrubbing or the possibility that a foreign object sensation may occur due to the mark being caught on the eyelid etc. Has also been avoided. Furthermore, since the magnetic metal powder is contained in a dispersed state, the mark itself can be easily deformed in accordance with the deformation of the contact lens, and adverse effects on physical properties such as deformation characteristics of the contact lens are avoided. However, it is possible to form a mark.

  Here, the specific shape, size, etc. of the mark formed of the magnetic metal powder are not limited in any way, and characters, symbols, figures, patterns, etc. can be arbitrarily employed. Moreover, even if it is the magnitude | size of a mark, you may form in a part of lens peripheral direction, or you may form continuously in the whole circumferential direction. Therefore, for example, it is possible to form the mark by including the magnetic metal powder in the entire peripheral portion. In such a case, the mark is recognized as a ring-shaped mark that spreads in the entire peripheral portion.

  In addition, in this embodiment, when the magnetic metal powder is contained in a predetermined region of the lens in a dispersed state, it is preferable to disperse a resin familiar with the lens material, preferably the same resin as the lens material, as a matrix. Therefore, for example, in a conventionally known polymerization molding, the mark can be easily formed by blending a magnetic metal powder in a dispersed state in a polymerizable monomer in advance and performing polymerization molding. In order to prevent agglomeration, the surface of the magnetic metal powder may be subjected to a pretreatment such as a resin coat or an insulating film.

  According to a second aspect of the present invention, in the contact lens according to the first aspect, the lens central portion is formed of a hard material, while the lens outer peripheral portion is formed of a soft material having hydrophilicity. Is a feature.

  The contact lens having a structure according to the present embodiment can be advantageously applied to a so-called multi-material contact lens. That is, since the hard material used as the contact lens material is hydrophobic, it is difficult to skillfully disperse the magnetic metal powder during lens molding. Is made of a soft material having hydrophilicity, and magnetic metal powder can be skillfully dispersed in the peripheral portion to be contained. In this aspect, since the lens can be removed by using magnetic attraction force, the optical part is hard and sticks to the eyeball like a suction cup, while the peripheral part to peel it off is soft Therefore, it is possible to make it easier to remove the multi-material contact lens which is difficult to remove. Here, preferably, the entire optical portion, that is, the region that exhibits an optical correction effect such as visual acuity is formed of a hard material, and the outer peripheral portion thereof is formed of a soft material. Thereby, deformation of the optical part can be suppressed, and stable optical characteristics can be obtained. In addition, when the junction position connecting the optical part and the peripheral part is different between the front and rear surfaces of the lens, the inner peripheral side of the front or rear junction position located on the inner peripheral side is made of a hard material. Is preferred.

  According to a third aspect of the present invention, in the contact lens according to the first or second aspect, the magnetic metal powder is unevenly distributed in the lens circumferential direction.

  In the contact lens having the structure according to this aspect, the weight of the peripheral portion is biased in the lens circumferential direction, so that the position of the center of gravity of the lens is biased. Thereby, the position of the center of gravity can be positioned downward by gravitational action during wearing, and the lens can be positioned in the circumferential direction. Therefore, the present invention can be applied particularly advantageously to a toric lens or a multifocal lens that requires circumferential positioning when worn.

  In the contact lens of this aspect, since the magnetic metal powder is included in the peripheral portion, it is not necessary to form the lens lower part thick like a prism ballast. Thereby, positioning in the circumferential direction can be realized without changing the lens shape, and the possibility of a decrease in wearing feeling can be advantageously avoided. However, it is of course possible to use this aspect in combination with a conventionally known circumferential positioning mechanism such as prism ballast or slab-off. In such a case, a more stable circumferential positioning effect can be obtained by a synergistic effect with these conventionally known circumferential positioning mechanisms.

  According to a fourth aspect of the present invention, in the contact lens according to any one of the first to third aspects, the magnetic metal powder is embedded over the entire circumference of the lens with a certain width in the lens radial direction. It is characterized by being.

  In the contact lens having a structure according to this aspect, an annular mark extending over the entire circumference of the peripheral portion can be formed. Thereby, a large total amount of the magnetic metal powder can be secured, and a magnetic attractive force can be advantageously obtained. At the same time, since a magnetic attractive force is exerted on the entire circumference of the peripheral portion, it is possible to perform more stable removal. Of course, this embodiment can be used in combination with the third embodiment. That is, the magnetic metal powder may be dispersed over the entire circumference of the lens and the amount of dispersion may be varied in the lens circumferential direction.

  According to a fifth aspect of the present invention, in the contact lens according to any one of the first to fourth aspects, the magnetic metal powder is used in combination with a plurality of colors. Features.

  In a contact lens having a structure according to this embodiment, a number of colors can be obtained as the color of the mark. Thereby, the diversity of the external appearance of a mark and the improvement of the visibility of a mark can be aimed at. Furthermore, a larger number of colors can be obtained by mixing magnetic metal powders of different colors and adjusting the mixing amount.

  A sixth aspect of the present invention is characterized in that, in the contact lens according to any one of the first to fifth aspects, a colored one is used as the magnetic metal powder. Also in this aspect, many colors can be obtained as the color of the mark, and the diversity of the appearance of the mark and the visibility of the mark can be improved.

  According to a seventh aspect of the present invention, in the contact lens according to any one of the first to sixth aspects, the magnetic metal powder having a particle size of 1 nm to 5 μm is used. And

  In the contact lens having the structure according to the present embodiment, the manufacturing becomes easier and a good wearing feeling can be obtained. That is, when the particle size of the magnetic metal powder is smaller than 1 nm, it is difficult to manufacture and handle the magnetic metal powder. There is a possibility of damage.

  According to an eighth aspect of the present invention, there is provided the contact lens according to any one of the first to seventh aspects, wherein the contact lens according to any one of the first to seventh aspects includes an easily deformable sucker-like portion superimposed on the lens front surface, and the lens in the sucker-like portion. It is characterized by being combined with a lens loading / unloading tool including a permanent magnet that forms a magnetic field on a surface superimposed on the front surface.

  In a contact lens having a structure according to this aspect, wearing and removing can be performed easily and reliably by using a lens wearing tool. That is, in the lens attachment / detachment tool of this aspect, since the permanent magnet is provided, the lens can be attracted by applying a magnetic attractive force to the magnetic metal powder contained in the lens. As a result, for example, when removing a lens worn on the eye, it is possible to remove the lens by removing the lens attachment / detachment tool close to the lens worn on the eye, so that the lens can be removed more easily and reliably. I can do it. Furthermore, the lens attachment / detachment tool of this aspect can be softly brought into contact with the lens since the sucker-like portion that is brought into direct contact with the lens is easily deformed. As a result, it is also reduced that a large force is exerted on the lens when the lens wearer is brought into contact, and it is possible to improve the safety of the wearer and the safety when contacting the eyeball, The possibility of damaging the lens can also be reduced. Furthermore, since the lens can be handled in a state where the lens is attracted to the lens attachment / detachment device with a magnetic attraction force, the risk of inadvertently dropping the lens is reduced, and the chance of fingers touching the lens directly is reduced. Can also improve hygiene.

  According to a ninth aspect of the present invention, in the contact lens according to the eighth aspect, the sucker-like portion is formed with an air hole that opens at the center of the overlapping surface on the lens front surface. An air chamber in which the air holes are communicated is formed behind the portion, and an air release valve is provided on the peripheral wall of the air chamber to allow the air chamber to communicate with the atmosphere by applying an external force. And the permanent magnet is arranged in the air chamber.

  In the contact lens having the structure according to the present embodiment, the contact lens can be more firmly attracted and supported by using the negative pressure attractive force by the sucker-like portion in addition to the magnetic attractive force by the magnet. Thereby, it is possible to more advantageously prevent the lens from falling off the lens loading / unloading tool. At the same time, the suction of the lens can be released by operating the air release valve to release the negative pressure suction force by the suction cup-like part, so that the lens can be easily removed from the lens attachment / detachment tool. I can do it.

  According to a tenth aspect of the present invention, in the contact lens according to the eighth or ninth aspect, the sucker-like portion has a smaller outer diameter than the front surface of the lens, and the sucker-like portion is the peripheral portion. The lens is superimposed on the front surface of the lens.

  In the contact lens having the structure according to this aspect, the sucker-like portion of the lens attachment / detachment tool is prevented or reduced from contacting the optical portion of the contact lens. As a result, the risk of damaging the optical part when the lens attachment / detachment tool comes into contact with the lens can be reduced.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 shows a front view of a contact lens 10 as a first embodiment of the present invention as a model, and FIG. 2 shows a longitudinal sectional view of the contact lens 10 as a model. The contact lens 10 has a substantially spherical shell shape as a whole, and is worn while being superimposed on the cornea surface of the eyeball as is well known. Wearing means wearing on a human body. Further, the contact lens 10 of the present embodiment has a lens central axis 12 as an optical axis, and has a rotating body shape around the lens central axis 12, so in FIG. Show only.

  More specifically, the contact lens 10 has a circular optical zone (optical zone) 14 formed in the central portion in a front view, as in the conventional case, and has an annular shape around the optical zone 14. A peripheral zone 16 is formed. An edge portion 18 is formed on the outer peripheral edge portion of the peripheral portion 16.

  The optical unit 14 has an optical unit front surface 20 and an optical unit rear surface 22. The rear surface 22 of the optical part has a center of curvature on the lens center axis 12 on the rear side of the lens (to the right in FIG. 2) so as to be substantially similar to the shape of the corneal surface to be mounted under the lens wearing condition. It is set as a base curve surface having a concave longitudinal section shape with an appropriate radius of curvature. The vertical cross-sectional shape of the base curve surface (the rear surface 22 of the optical part) is, for example, an arc shape with a constant radius of curvature, a curvature, in consideration of the shape of the cornea, other wearing conditions, or required optical characteristics. Various curved concave shapes such as a conical curved shape in which the radius is changed in the radial direction can be appropriately adopted. In particular, in the present embodiment, in order to impart optical characteristics for correcting astigmatism, a toric surface is formed on the rear surface 22 of the optical unit so that an appropriate cylindrical power is expressed with an appropriate cylindrical axis angle.

  On the other hand, the optical unit front surface 20 is set as a curved surface shape capable of giving a target lens power in cooperation with the base curve surface 22 set as described above. Specifically, the center of curvature is set behind the lens on the lens center axis 12 to form a curved convex surface having a longitudinal sectional shape with an appropriate radius of curvature. Note that the front surface (front curve surface) 20 of the optical unit is determined in consideration of the shape of the base curve surface 22, wearing conditions, optical characteristics such as required lens power, and the like. For example, in addition to an arc shape with a constant curvature radius, various curved concave shapes such as a conical curve shape in which the curvature radius is changed in the radial direction can be appropriately employed.

  The optical unit front surface 20 and the optical unit rear surface 22 form an optical unit 14 having optical characteristics such as an appropriate lens power for correcting vision. The optical unit 14 is a region where an optical effect on the eyes of the wearer is expected, and the outer peripheral edge thereof, that is, the boundary with the peripheral portion 16 is generally on the longitudinal section on the front surface and the rear surface of the lens, respectively. For example, when the lens surface of the optical unit is designed with a vertical cross-sectional shape that gradually changes in the radial direction, or the boundary is formed with a predetermined width in the radial direction. The boundary between the optical part and the peripheral part on the front and rear surfaces of the lens needs to be clearly defined as a line in the case where the optical part and the peripheral part are formed by a connection region that smoothly connects the front and rear surfaces. There is no.

  On the other hand, the peripheral portion 16 extends concentrically with the lens central axis 12 as a center when viewed from the front, and has a peripheral front surface 26 and a peripheral rear surface 28. Here, the junction 30, which is a connection portion between the outer peripheral edge of the optical part 14 and the inner peripheral edge of the peripheral part 16, is smoothly connected on the front and rear surfaces thereof. That is, the outer peripheral edge portion of the optical unit front surface 20 and the inner peripheral edge portion of the peripheral portion front surface 26, and the outer peripheral edge portion of the optical unit rear surface 22 and the inner peripheral edge portion of the peripheral portion rear surface 28 are smoothly connected at the junction 30. Yes. Specifically, the front and rear surfaces are smooth so as to have a common tangent line, such as a multi-degree curve such as a quadratic curve or a cubic curve, a trigonometric function, a conic curve, or the like so that there is no break point in the longitudinal section. It is desirable to be connected to.

  As described above, the contact lens 10 having a substantially spherical shell shape as a whole is formed of two different materials. Specifically, a circular region located in the center in a front view in the direction of the lens optical axis 12 (see FIG. 1) is a central portion 32 formed of a hard material. On the other hand, a ring-shaped region that surrounds the central portion 32 and is located on the outer periphery in a front view in the direction of the lens optical axis 12 is an outer peripheral portion 34 formed of a soft material having hydrophilicity. That is, the central portion 32 and the outer peripheral portion 34 have a coaxial rotating body shape with the lens optical axis 12 as the center.

Here, as the hard material forming the central portion 32, a material whose Young's modulus: Y _c is 3 MPa <Y _c ≦ 3000 MPa, more preferably 100 MPa ≦ Y _c ≦ 1500 MPa is suitably employed. On the other hand, as the soft material forming the outer peripheral portion 34, a material whose Young's modulus: Y _p is 0.2 MPa ≦ Y _c ≦ 3 MPa, more preferably 0.2 MPa ≦ Y _c ≦ 2 MPa is suitably employed. .

  As the hard material forming the central portion 32, various conventionally known hard contact lens materials can be used. For example, methyl methacrylate (MMA) or the like can be used. Preferably, siloxanyl is used. Oxygen permeable hard contact lens materials such as methacrylate (SMA), fluoromethacrylate (FMA), cellulose acetate butyrate (CAB), silicone copolymer, fluorosilicone acrylate, fluorocarbon polymer, and silicone rubber are employed.

  On the other hand, as the soft material forming the outer peripheral portion 34, conventionally known various materials for soft contact lenses can be employed. For example, hydroxyethyl methacrylate (HEMA), N-vinylpyrrolidone (N-VP), dimethylacrylamide ( A hydrous soft contact lens material such as DMAA) or glycerol methacrylate (GMA) can be used.

  The central portion 32 and the outer peripheral portion 34 are partitioned by a circular boundary surface 36 that extends around the lens central axis 12 in the radial intermediate portion of the contact lens 10. The boundary surface 36, which is a joint portion of the different materials, is positioned in the peripheral portion 16. In particular, in this embodiment, the boundary surface 36 is slightly closer to the optical portion 16 from the substantially central portion in the radial direction (width direction) of the peripheral portion 16. It is located in. That is, the boundary surface 36 is positioned on the outer side in the lens radial direction with respect to the junction 30 that connects the optical portion 14 and the peripheral portion 16, and the optical portion 14 of the contact lens 10 in the present embodiment is formed of a hard material. The peripheral portion 16 is formed of a hard material that surrounds the optical portion 14 in the central portion 32 and a soft material that forms the outer peripheral portion 34.

  As a result, the boundary surface 36 is exposed as a boundary line on the peripheral front surface 26 on the front surface of the lens, and is exposed as a boundary line on the peripheral rear surface 28 on the rear surface of the lens. In the present embodiment, the boundary surface 36 is a cylindrical surface substantially parallel to the lens optical axis 12, but the boundary surface 36 may be a tapered surface inclined with respect to the lens optical axis 12. good. Further, the position of the boundary surface 36 is not limited, and is appropriately set in consideration of the wearer's corneal diameter, pupil diameter, corneal shape, and the like including the size of the optical part 14 and the peripheral part 16. The

  Furthermore, a mark 38 that is visible from the outside is formed on the peripheral portion 16 of the contact lens 10 in the present embodiment. The mark 38 is attached to identify the front and rear surfaces and the circumferential direction position of the contact lens 10, whether the contact lens 10 is for the left eye or the right eye, or to decorate the appearance of the lens. It is. In particular, in the present embodiment, the mark 38 has a rectangular shape extending in the lens radial direction, and points to the 6 o'clock position with the contact lens 10 positioned at the target circumferential position. . In the present embodiment, the mark 38 is formed on the outer peripheral portion 34 made of a soft material in the peripheral portion 16.

  Here, the mark 38 is formed by allowing the magnetic metal powder 40 to be present in a dispersed state in a predetermined region of the peripheral portion 16. In particular, in the present embodiment, as described above, the lens diameter is set at the outer peripheral portion 34. The rectangular mark 38 is formed by the magnetic metal powder 40 being included in a rectangular region extending in the direction. Examples of the magnetic metal powder 40 include iron, cobalt, nickel, iron-silicon alloys, iron-nitrogen alloys, iron-nickel alloys, iron-carbon alloys, iron-boron alloys, and iron-cobalt alloys. An alloy, an iron-phosphorus alloy, an iron-nickel-cobalt alloy, an iron-aluminum-silicon alloy, or the like is preferably used.

  Further, the particle size of the magnetic metal powder 40 is preferably 1 nm to 5 μm, more preferably 10 nm to 3 μm. When the particle size of the magnetic metal powder 40 is smaller than 1 nm, it is difficult to manufacture and handle the magnetic metal powder 40. On the other hand, when the particle size is larger than 5 μm, the magnetic metal powder 40 is exposed on the lens surface. This is because there is a possibility that the wearing feeling may be significantly impaired.

  Further, the magnetic metal powder 40, in other words, the mark 38 is formed so as to be embedded in the peripheral portion 16 while being exposed on the front surface 26 of the peripheral portion. Thus, the mark 38 is formed on the peripheral rear surface 28 without being exposed. Further, the mark surface 42 exposed on the peripheral front surface 26 has a curved surface shape along the peripheral front surface 26, so that the peripheral front surface 26 as a whole has a smooth surface without unevenness. .

  And the specific gravity of the magnetic metal powder 40 in this embodiment is larger than the specific gravity of the lens material which forms the outer peripheral part 34, and as for the contact lens 10, the magnetic metal powder 40 concerning a part of lens circumferential direction is included. Accordingly, the portion where the mark 38 is formed is made heavier than the other portions in the circumferential direction of the lens. As a result, when the contact lens 10 is mounted on the eyeball, the portion where the mark 38 is formed by gravity action is rotated so as to be positioned below, and the mark 38 is positioned at the circumferential position positioned below. It will be.

  The mark 38 is formed by embedding the magnetic metal powder 40 in the outer peripheral portion 32, which is composed of two kinds of materials, that is, the central portion 32 formed of a hard member as described above and the outer peripheral portion 34 formed of a soft member. The crimped contact lens 10 can be manufactured, for example, by the following method.

  First, as shown in FIG. 3A, a lens molding female die 46 having a lens molding surface 44 having a shape corresponding to the lens front surface of the target contact lens 10 is prepared. Then, magnetic metal powder 40 having a shape corresponding to the mark 38 is attached to the position where the mark 38 is formed on the lens molding surface 44 of the lens molding female mold 46 by adhesion or the like.

  Next, as shown in FIG. 3 (b), a polymerizable monomer 47 serving as a material of the outer peripheral portion 34 of the contact lens 10 is injected into a saucer-shaped region formed by the lens molding surface 44 of the lens molding female mold 46. After that, by fitting a male molding die 50 having a lens molding surface 48 having a shape corresponding to the lens rear surface of the target contact lens 10, the mold matching is performed, and the polymerizable monomer 47 is filled and sealed. The molding cavity 52 is formed. Thereafter, the polymerization process of the polymerizable monomer 47 is performed while maintaining the mold matching state of both molds 46 and 48.

  Then, after the polymerization of the polymerizable monomer 47, the lens 38 is attached to the lens molding surface 44 of the lens molding female mold 46 by opening the lens molding female mold 46 and the lens molding male mold 50. Can be obtained. The contact lens obtained at this stage is entirely made of a soft material that forms the outer peripheral portion 34. However, the contact lens in the present invention is not necessarily limited to the two kinds of materials, and the whole is simple. A soft contact lens formed of one soft material may be used. In such a case, the target contact lens can be obtained by the manufacturing method as described above. Further, by using a hard material as the polymerizable monomer 47, a hard contact lens provided with the mark 38 having a structure according to the present invention can be obtained.

  And in order to obtain the contact lens of the 2 type material by which the outer peripheral part 34 was formed with a soft material and the center part 32 was formed with the hard material like the contact lens 10 in this embodiment, the above-mentioned manufacturing method A central portion made of a hard material separately manufactured by an appropriate method such as a molding method or a cutting method after forming a through hole in a portion corresponding to the central portion 32 in the contact lens formed of the soft material obtained by 32 is fixed in the through hole by bonding or the like. As a result, it is possible to obtain the contact lens 10 in which the central portion 32 is formed of a hard material, while the outer peripheral portion 34 is formed of a soft material, and the mark 38 made of magnetic metal powder 40 is embedded in the outer peripheral portion 34. I can do it.

  In the contact lens 10 having such a structure, since the mark 38 is formed by the magnetic metal powder 40, it is possible to easily form a minute mark. Since the mark 38 itself can be deformed along with the deformation of the outer peripheral portion 34, the possibility of hindering the deformation of the outer peripheral portion 34 is also avoided, and a good wearing feeling can be stably obtained. In addition, the center of gravity of the contact lens 10 is deviated from the lens center axis 12 by forming the mark 38. As a result, at the time of wearing on the eyeball, the mark 38 is positioned below, and in the contact lens 10 according to the present embodiment, the circumferential positioning effect similar to that of the ballast mechanism can be obtained by the mark 38. Therefore, according to the contact lens 10 of the present embodiment, since the mark 38 is embedded in the peripheral portion 16, the ballast mechanism can be used without changing the lens shape such as a conventionally known prism ballast or slab-off. Therefore, the circumferential positioning effect can be obtained without impairing the wearing feeling.

  By the way, the contact lens 10 in this embodiment is suitably used in combination with a dropper 60 as a lens attachment / detachment tool. The dropper 60 is shown in FIGS. The dropper 60 has a structure in which a suction cup 64 as a suction cup-like portion is provided at the tip of a main body 62 extending in a rod shape.

  More specifically, the dropper 60 has a structure in which a shaft member 68 is inserted into a cylindrical member 66 having a suction cup 64. The cylindrical member 66 is shown in FIGS. The cylindrical member 66 is formed of a member having airtightness and elasticity such as silicon resin, and extends straight with a substantially constant rounded square outer cross-sectional shape, and has a substantially constant circular cross-sectional shape at a central portion thereof. A substantially cylindrical tube portion 70 having an internal space extending in the direction is formed. Furthermore, a suction cup 64 is integrally formed at one end of the cylindrical portion 70. In addition, the connection part with the suction cup 64 in the cylinder part 70 is made into the taper shape gradually diameter-reduced toward the suction cup 64. As shown in FIG. Here, the outer diameter dimension of the suction cup 64 is smaller than the lens front surface of the contact lens 10 and larger than the outer diameter dimension of the central portion 32 formed of a hard material in the contact lens 10. Further, particularly in the present embodiment, a through-hole penetrating the suction cup 64 is formed in the central portion of the suction surface 71 of the suction cup 64, and a permanent magnet 72 having an annular plate shape is formed in the through-hole. It is fixed. Due to the central hole of the permanent magnet 72, an air hole 74 that opens on the suction surface 71 and communicates with the internal space of the cylindrical portion 70 is formed in the central portion of the suction surface 71 of the suction cup 64. Further, an opening 76 is formed at the end of the cylindrical portion 70 opposite to the side where the suction cup 64 is formed, so that one end of the internal space of the cylindrical portion 70 passes through the air hole 74. While communicating with the outside, the other end communicates with the external space through the opening 76.

  On the other hand, as shown in FIGS. 9 and 10, the shaft member 68 has a shape in which a rod-shaped insertion portion 80 is integrally provided at one end of the rod-shaped portion 78 as a whole. The rod-shaped portion 78 has a solid shape substantially equal to the outer shape of the cross-section of the cylindrical portion 70 of the cylindrical member 66 and has a substantially rectangular cross-section with rounded corners. The insertion portion 80 has a generally cylindrical shape that opens upward (upward in FIG. 10) as a whole, and the outer diameter of the insertion portion 80 is substantially equal to the inner diameter of the cylindrical portion 70 of the cylindrical member 66. ing. Further, a communication hole 84 is provided in the end of the bottom plate 82 that forms the bottom surface of the insertion portion 80 on the side opposite to the rod-shaped portion 78 in the thickness direction of the bottom plate 82. Here, an inclined surface 86 is formed on the inner peripheral surface of the communication hole 84 on the rod-shaped portion 78 side so as to spread upward from a substantially middle portion in the thickness direction of the bottom plate 82.

  In addition, a concave portion 90 is formed on the outer surface of the protruding tip portion 88 of the insertion portion 80 so as to open downward in the protruding tip direction (left direction in FIG. 10). Further, between the insertion portion 80 and the rod-shaped portion 78, a columnar connection portion 92 having a slightly smaller cross-sectional area than that of the insertion portion 80 is formed integrally with the insertion portion 80 and the rod-shaped portion 78. The insertion portion 80 and the rod-shaped portion 78 are integrally connected by the connection portion 92. Further, a concave air hole 94 that opens upward is formed between the internal space of the insertion portion 80 and the end of the rod-shaped portion 78 on the connection portion 92 side at the center portion of the upper surface of the connection portion 92. ing.

  The operation member 96 is placed in a semi-accommodated state on the insertion portion 80 of the shaft member 68 having such a structure. 11 and 12 show the operation member 96. FIG. The operation member 96 has a fulcrum portion 100 projecting downward (downward in FIG. 12) at one end portion of a beam portion 98 that extends straight with a substantially constant rectangular cross-sectional shape, while the other end portion. In addition, the action portion 102 that protrudes downward is integrally formed. While the fulcrum part 100 has a cylindrical shape, the action part 102 has a flat plate shape having a projecting dimension larger than the projecting dimension of the fulcrum part 100. Here, the thickness dimension (vertical direction dimension in FIG. 11) of the operation member 96 is substantially constant as a whole, and the opening of the insertion portion 80 of the shaft member 68 in the direction perpendicular to the axis (vertical direction in FIG. 9). The thickness dimension is slightly smaller than the dimension. Therefore, the diameter dimension of the fulcrum part 100 having a cylindrical shape is equal to the thickness dimension of the beam part 98, and the thickness dimension of the action part 102 having a flat plate shape is the thickness dimension of the beam part 98. Is equal to. Further, the longitudinal direction (left and right direction in FIG. 12) dimension of the action portion 102 is slightly smaller than the longitudinal direction (left and right direction in FIG. 10) dimension of the communication hole 84 of the insertion portion 80 in the shaft member 68. .

  Thus, as shown in FIG. 6, the operation member 96 superimposes the protruding tip surface of the fulcrum part 100 on the bottom surface 82 on the bottom surface 82 of the insertion portion 80 of the shaft member 68, and the protruding tip portion of the action portion 102. Is placed in the communication hole 84. As a result, the operation member 96 is placed in the semi-accommodating state on the insertion portion 80 of the shaft member 68. The insertion portion 80 on which the operation member 96 is placed is inserted into the cylindrical portion 70 from the opening 76 of the cylindrical member 66, and the end surface on the opening 76 side is the insertion portion of the rod-shaped portion 78 of the shaft member 68. It is inserted until it comes into contact with the end face on the 80 side. Thereby, the insertion state of the insertion portion 80 is maintained by the elasticity of the cylindrical member 66, and thus the dropper 60 is configured.

  In such an assembled state, the opening 76 of the cylindrical member 66 is covered with the end surface of the rod-shaped portion 78 of the shaft member 68 on the insertion portion 80 side. Further, the communication hole 84 of the insertion portion 80 is covered with the inner peripheral surface 104 of the cylindrical portion 70 of the cylindrical member 66. The axial length from the end surface of the rod-shaped portion 78 on the insertion portion 80 side to the protruding end surface of the protruding tip portion 88 of the insertion portion 80 is slightly larger than the axial length of the internal space of the tubular member 66. It has been made smaller. As a result, the protruding distal end portion 88 of the insertion portion 80 is positioned slightly apart from the back surface of the suction cup 64 that forms the end surface of the internal space of the cylindrical portion 70. And since the protrusion front-end | tip part 88 has spread over the whole axial direction of the internal space of the cylinder part 70, the internal space of the cylinder part 70 is divided by the protrusion front-end | tip part 88, the back surface of the suction cup 64, In other words, the air chamber 106 is formed between the end surface of the internal space of the cylindrical portion 70 opposite to the opening 76, and the protruding tip 88 and the inner peripheral surface 104 of the cylindrical portion 70. Thus, in the present embodiment, the peripheral wall of the air chamber 106 is formed by the inner peripheral surface 104 of the cylindrical portion 70. One end face of the air chamber 106 includes the permanent magnet 72.

  When the above-described contact lens 10 is removed from the eyeball using the dropper 60 having such a structure, first, as shown in FIG. 13A, the suction cup 64 of the dropper 60 is worn on the eyeball: E. The contact lens 10 is superimposed on the lens front surface and pressed toward the contact lens 10. Therefore, particularly in the present embodiment, the mark 38 of the contact lens 10 is formed of the magnetic metal powder 40, and the permanent magnet 72 is provided at the central portion of the suction cup 64 of the dropper 60. As a result, a magnetic field is formed on the suction surface 71 serving as a surface to be superimposed on the contact lens 10 in the suction cup 64, and a magnetic attraction force toward the suction cup 64 can be generated with respect to the mark 38 and the contact lens 10. It is possible to draw the contact lens 10 toward the suction cup 64. As a result, the contact lens 10 can be attracted to the suction cup 64 using the magnetic attractive force. At the same time, the suction force of the suction cup 64 serving as the suction cup also acts, so that the suction state of the contact lens 10 to the suction cup 64 can be expressed more firmly.

  In particular, the dropper 60 in the present embodiment is deformed so that the suction cup 64 conforms to the lens front surface shape of the contact lens 10 because the suction cup 64 that is a contact portion to the contact lens 10 can be easily deformed. By doing so, the possibility that an excessive force is applied to the contact lens 10 when the dropper 60 is pressed is reduced, and the possibility of damaging the contact lens 10 is also reduced. In addition, since the outer diameter dimension of the suction cup 64 is larger than the diameter dimension of the central portion 32 of the contact lens 10, the suction cup 64 is superimposed on the outer peripheral portion 34 formed of a soft material on the peripheral front surface 26. It has come to be. Thereby, it is avoided that the suction cup 64 is superimposed on the optical part front surface 20, and the possibility of scratching the optical part front surface 20 is also reduced.

  And as shown in FIG.13 (b), the contact lens 10 can be removed from an eyeball by separating the dropper 60 which adsorb | sucked the contact lens 10 from the eyeball. Here, if the contact lens 10 and the dropper 60 in the present embodiment are used, the strong attracting state by the cooperation of the magnetic attraction force and the negative pressure attraction force as described above is maintained. Can be stably obtained, and the possibility that the contact lens 10 is detached from the suction cup 64 when the contact lens 10 is peeled off from the eyeball is reduced. It is possible to do.

  At the same time, particularly in the so-called multi-material contact lens in which the central part 32 including the optical part 14 is formed of a hard material while the outer peripheral part 34 including the peripheral part 16 is formed of a soft material as in the present embodiment. The central portion 32 is hard and sticks to the eyeball like a suction cup. On the other hand, the outer peripheral portion 32 that peels it off is soft, so that it is difficult to exert an effective peeling force on the central portion 32 and the peeling is likely to be difficult. Therefore, in particular, when the contact lens 10 and the dropper 60 in the present embodiment are used, an effective peeling force is obtained by attracting the outer peripheral portion 32 by applying a magnetic attractive force to the outer peripheral portion 32 through the mark 38. Therefore, when removing multi-material contact lenses, which are generally difficult to remove, an extremely effective effect can be exhibited.

  Next, when the contact lens 10 removed from the eyeball in this way is removed from the dropper 60, as shown in FIG. 14, a position slightly separated from the suction cup 64 in the cylindrical portion 70 is pressed with fingers. As a result, the action portion 102 of the operation member 96 is pushed outward (downward in FIG. 14) from the communication hole 84 with the fulcrum portion 100 as a fulcrum, and the inside of the cylindrical portion 70 that has sealed the communication hole 84. The peripheral surface 104 is pushed outward by the action portion 102. As a result, the air chamber 106 is communicated with the external space through the communication hole 84 and the vent hole 94 to be communicated with the atmosphere. As is clear from this, in the present embodiment, the air release valve is configured to include the communication hole 84, the action portion 102, and the inner peripheral surface 104. Furthermore, the air chamber 106 and the communication hole 84 can be more easily communicated with each other by the concave portion 90 formed at the projecting tip portion 88 of the shaft member 68. Then, between the suction surface 71 of the suction cup 64 and the suction surface of the contact lens 10 communicated with each other through the air chamber 106 and the air hole 74, the suction surface of the suction cup 64 is connected to the atmosphere. After being released, the contact lens 10 can be removed from the dropper 60.

  If such a dropper 60 is used in combination with the contact lens 10 in the present embodiment, the contact lens 10 can be attached and detached more easily by the magnetic attractive force and the negative pressure attractive force as described above. And since the suction | attraction state to the suction cup 64 is maintained even after removing the contact lens 10 from an eyeball, the possibility that the contact lens 10 may be dropped and damaged or lost can be reduced. In addition, since the opportunity for the fingers to come into direct contact with the contact lens 10 is reduced, the hygiene can be improved.

  Next, FIG. 15 shows a contact lens 110 as a second embodiment of the present invention. In the following description, members or parts that are substantially the same as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

  Similar to the contact lens 10 according to the first embodiment, the contact lens 110 includes a central portion 32 formed of a hard material and an outer peripheral portion 34 formed of a soft material. While the optical part 14 is formed, a peripheral part 16 is formed over the entire outer periphery of the optical part 14.

  In the contact lens 110 according to this embodiment, three marks 112a, 112b, and 112c are formed on the outer peripheral portion 34 at a predetermined distance in the circumferential direction. Here, each of the marks 112a, 112b, and 112c has substantially the same shape as the mark 38 in the first embodiment described above, and has a rectangular shape extending over a predetermined dimension in the radial direction of the contact lens 110. Has been.

  Here, each of the marks 112a, 112b, and 112c is formed of the magnetic metal powder 40 embedded in the outer peripheral portion 34 as in the case of the above-described mark 38. In particular, in the present embodiment, each of the marks 112a, 112b, and 112c is formed. Magnetic metal powders having different colors are used as the magnetic metal powder 40 that forms 112b and 112c. For example, in this embodiment, the mark 112a has a white appearance when iron is used as the magnetic metal powder 40, the mark 112b is blue when cobalt is used as the magnetic metal powder 40, and the mark 112c is magnetic. By using nickel as the metal powder 40, a silver-white appearance is exhibited. Thereby, the visibility of the contact lens 110 can be further improved, and for example, when the contact lens 110 is dropped on the floor surface, it can be easily discovered.

  Further, the three marks 112a, 112b, and 112c are formed so as to be close to each other in the circumferential direction of the outer peripheral portion 34. In particular, in the present embodiment, the three marks 112a, 112b, and 112c are formed so as to be within the range of the arc having a central angle = 45 °. Has been. Thereby, the weight deviation in the circumferential direction of the outer peripheral portion 34 is more remarkably generated, and the circumferential positioning effect during wearing on the eyeball can be more stably exhibited.

  As is apparent from the present embodiment, the number of marks formed is not limited at all. In particular, in the present embodiment, the three marks 112a, 112b, and 112c are formed at positions close to each other in the circumferential direction of the outer peripheral portion 34, so that a more effective ballast effect is exhibited. For example, it is of course possible to form a plurality of such rectangular marks over the entire circumference of the outer peripheral portion 34.

  Furthermore, in this embodiment, by using different magnetic metal powders as the magnetic metal powder 40 for forming the marks 112a, 112b, and 112c, different colors are given to the marks 112a, 112b, and 112c. Instead of or in addition to using various magnetic metal powders having different colors, the magnetic metal powder may be colored with a conventionally known appropriate pigment. In this way, more colors can be obtained as the color of the mark, and the design effect can be further enhanced.

  Next, FIG. 16 shows a contact lens 120 as a third embodiment of the present invention. Unlike the contact lenses 10 and 110 in the first and second embodiments described above, the contact lens 120 in the present embodiment is entirely formed of a single soft material including the optical portion 14 and the peripheral portion 16. It is considered as a soft contact lens. In addition, as this soft material, the soft material which forms the outer peripheral part 34 of the contact lens 10 as above-mentioned 1st embodiment is employable suitably. As described above, the present invention is not necessarily limited to the contact lenses of various materials, and the soft contact lens formed entirely from a soft material as in the present embodiment or the whole formed from a hard material. It is also possible to employ hard contact lenses. In addition, as this hard material, the hard material which forms the center part 32 of the contact lens 10 as above-mentioned 1st embodiment is employable suitably.

  And in the contact lens 120 in this embodiment, the mark 122 formed from the magnetic metal powder 40 is included in the peripheral part 16. Here, the appearance shape of the mark 122 is a character, and in the present embodiment, it is one character “right”. Thereby, it is displayed that the contact lens 120 is a contact lens for the right eye. Thus, the external shape of the mark in the present invention is not limited at all.

  Although illustration is omitted here, it is of course possible to give the letter “left” as a mark to the contact lens for the left eye in the same manner as the contact lens 120. In such a case, as shown in the second embodiment, a magnetic metal powder having a different color is used as the magnetic metal powder 40, or the magnetic metal powder 40 is colored with different pigments. More preferably, the left and right marks are formed in different colors. In this way, the left / right distinction can be made clearer.

  Next, FIG. 17 shows a contact lens 130 as a fourth embodiment of the present invention. Similar to the contact lens 10 in the first embodiment, the contact lens 130 is a multi-material contact lens formed of a central portion 32 formed of a hard material and an outer peripheral portion 34 formed of a soft material. The peripheral portion 16 is formed including the outer peripheral portion 34.

  In particular, the contact lens 130 according to the present embodiment includes the magnetic metal powder 40 over the entire outer peripheral portion 34. As a result, the contact lens 130 is formed with an annular mark 132 extending around the entire circumference with a constant radial width dimension equal to the radial width dimension of the outer peripheral portion 34. Here, since the magnetic metal powder 40 forming the mark 132 is included over the entire outer peripheral portion 34, the mark 132 extends over the entire thickness direction of the outer peripheral portion 34 as shown in FIG. 18. It has a thickness dimension, and the surface of the mark 132 is exposed on both sides of the lens front surface and the lens rear surface.

  In the contact lens 130 having such a structure, since the magnetic metal powder 40 is included in the entire circumferential direction of the outer peripheral portion 34, the magnetic attraction is applied to the entire circumferential direction of the contact lens 130. Can exert power. Thereby, more stable suction can be performed. Further, as is clear from the present embodiment, the mark in the present invention may have a shape that is continuous over the entire circumference. Further, particularly in the present embodiment, the magnetic metal powder 40 is included only in the entire outer portion of the peripheral portion 16 constituted by the outer peripheral portion 34. For example, the magnetic metal powder 40 extends over the entire peripheral portion 16. It is also possible to form a ring-shaped mark extending over the entire peripheral portion 16 by including the powder 40.

  The contact lens 130 having such a structure can be manufactured by, for example, the following method.

  First, as shown in FIG. 19 (a), a soft material prepared by blending a water-soluble inert substance into a molded container 134 having a bottomed cylindrical shape is filled, and in the soft material, Thick disk-shaped lens blanks 136 made of a soft material are formed by dispersing the magnetic metal powder 40 and polymerization.

  Next, as shown in FIG. 19B, a through hole 138 that penetrates the approximate center of the lens blank 136 in the axial direction is formed by machining or the like, and the lens blank 136 is processed into a substantially cylindrical shape. Thereafter, the gas permeable hard material is filled into the through holes 138 formed in the lens blanks 136 made of a soft material, and polymerization molding is performed.

  As a result, it is possible to obtain a lens blank 140 whose center is formed of a hard material and whose outer periphery is integrally formed of a soft material and magnetic metal powder is embedded in the outer periphery. If such a lens blank 140 can be obtained, then the lens blank 140 is cut according to a conventionally known processing apparatus and processing method to process the contact lens 130 into a target shape.

  Further, the obtained contact lens 130 is immersed in treated water having an appropriate osmotic pressure, and the water-soluble inert substance blended in the soft material is replaced with water. As a result, the soft material that has been hard at the time of processing can be softened by containing water with almost no change in volume or shape. Accordingly, it is possible to obtain a contact lens 130 in which the central portion is formed of a hard material and the outer peripheral portion is formed of a soft material in which magnetic metal powder is contained in a dispersed state throughout.

  Next, FIG. 20 shows a contact lens 150 as a fifth embodiment of the present invention. The contact lens 150 is formed of a central portion 32 formed of a hard material and an outer peripheral portion 34 formed of a soft material, as in the contact lens 10 as the first embodiment described above. In addition, a plurality of marks 152 are included.

  Each of the marks 152 in the present embodiment has a floral pattern shape formed by a plurality of small marks 154 gathered, and is irregularly disposed on the outer peripheral portion 34, thereby improving the design of the contact lens 150. The effect is enhanced. As described above, as the mark shape in the present invention, it is possible to adopt a specific design as in the present embodiment. Here, as described above, it is of course possible to assign an appropriate color to each mark 152 and form the plurality of marks 152 with a large number of colors. Furthermore, the single mark 152 may be formed in a number of colors by making the colors of the small marks 154 constituting each mark 152 different from each other.

  Next, FIG. 21 shows a contact lens 160 as a sixth embodiment of the present invention. The contact lens 160 is formed at a position where a central portion 32 made of a hard material is deviated from the lens center axis 12, and a center axis 164 of the optical unit 14 is formed at a position away from the lens center axis 12. Has been. A band-shaped mark 162 extending in the circumferential direction over a predetermined dimension is formed on the outer peripheral edge of the outer peripheral portion 34.

  As is clear from the present embodiment, as the contact lens in the present invention, it is possible to adopt an optical portion and a peripheral portion that are not formed on the same central axis, and further, illustration is omitted. However, it is also possible to employ an optical part or a peripheral part having a non-rotating body shape such as an ellipse. In the contact lens 160 in which the optical part 14 and the peripheral part 16 are not positioned on the same central axis as described above, the center of gravity position may be deviated from the lens central axis. In order to position at the position, it is necessary to further add a specific shape such as prism ballast or slab off. However, according to the contact lens 160 in the present embodiment, the ballast effect by the mark 162 is exhibited. Therefore, the contact lens 160 can be stably positioned at the desired circumferential position without providing such a specific shape.

  FIG. 22 shows a contact lens 170 as a seventh embodiment of the present invention. The contact lens 170 is a soft contact lens formed entirely of a soft material including the optical part 14 and the peripheral part 16.

  And the mark 172 is formed in the peripheral part 16 of the contact lens 170 by the magnetic metal powder 40 being contained so that it may become a small quantity gradually toward the center direction from an outer peripheral part. The mark 172 is a so-called fine lens pattern that makes the black eye appear larger when worn. By wearing the contact lens 170 in this embodiment, the black eye can be made larger. In this embodiment, by forming such a fine lens pattern using the magnetic metal powder 40, the contact lens 170 can be attracted and held using a magnetic attractive force.

  Further, the specific structure of the lens attachment / detachment tool is not limited to the structure as described above. For example, like the dropper 180 as the second embodiment of the lens attachment / detachment tool shown in FIG. 23, the projecting tip portion 88 of the shaft member 68 may be formed of a permanent magnet. In this way, since a larger permanent magnet can be provided as compared with the dropper 60 as the first embodiment described above, a larger magnetic attractive force can be exerted on the contact lens according to the present invention. I can do it. Further, since the suction surface 71 of the suction cup 64 is not provided with a permanent magnet, the entire suction face 71 can be easily deformed, so that the negative pressure suction effect by the suction cup 64 can be exhibited more advantageously.

  Furthermore, the operation member 96 may be formed of a permanent magnet, as in a dropper 190 as a third embodiment of the lens attachment / detachment tool shown in FIG. If it does in this way, while being easy to manufacture, a larger permanent magnet can be provided.

  As mentioned above, although several embodiment of this invention has been explained in full detail, these are illustration to the last, Comprising: This invention is not interpreted at all by the concrete description in these embodiment at all. .

  For example, the internal state of the magnetic metal powder 40 includes the state exposed on the lens front surface (see FIG. 2), the state exposed on the lens front surface and the lens rear surface (see FIG. 18), and FIG. As shown in FIG. 3, the outer peripheral portion 34 may be completely embedded without being exposed on the lens front surface or the lens rear surface. In this way, the lens surface shape can be made smoother, and the possibility of impairing the wearing feeling can be reduced. Moreover, the possibility that the magnetic metal powder 40 leaks from the outer peripheral portion 34 can be reduced.

  In addition, as shown in FIG. 25, the contact lens in which the magnetic metal powder 40 is completely contained in the outer peripheral portion 34 is, for example, a manufacturing method substantially similar to the contact lens 10 according to the first embodiment (FIG. 3). See). That is, the magnetic metal powder 40 is printed and adhered in a desired shape on the lens molding surface 44 of the lens molding female mold 46, and the surface condition of the lens molding surface 44 is appropriately set by, for example, selecting the surface roughness or the surface coating material. Adjust. As a result, the polymerizable monomer 47 filled in the molding cavity 52 can be circulated between the lens molding surface 44 and the magnetic metal powder 40, and the magnetic metal powder 40 can be placed on either the front or back of the outer peripheral portion 34. It is possible to achieve a completely embedded state that is not exposed to the surface.

  Further, the sucker-like portion in the lens attachment / detachment tool does not necessarily have to act as a suction cup. Therefore, the contact lens may be held by suction using only the magnetic attractive force.

BRIEF DESCRIPTION OF THE DRAWINGS Front explanatory drawing which shows the contact lens as 1st embodiment of this invention. Explanatory drawing which shows only one side from the lens central axis in the II-II cross section of FIG. Explanatory drawing for demonstrating the manufacturing method of the contact lens shown in FIG. The top view of the lens loading / unloading tool used in combination with the contact lens shown in FIG. The front view of the lens attachment / detachment tool. VI-VI sectional drawing in FIG. The top view of the cylinder member which comprises the lens attachment / detachment tool shown in FIG. VIII-VIII sectional drawing in FIG. The top view of the shaft member which comprises the lens attachment / detachment tool shown in FIG. XX sectional drawing in FIG. The top view of the operation member which comprises the lens attachment / detachment tool shown in FIG. XII-XII sectional drawing in FIG. Explanatory drawing for demonstrating the adsorption | suction method of the contact lens by the lens attachment / detachment tool shown in FIG. Explanatory drawing for demonstrating the removal method of the contact lens from the lens attachment / detachment tool shown in FIG. Front explanatory drawing which shows the contact lens as 2nd embodiment of this invention. Front explanatory drawing which shows the contact lens as 3rd embodiment of this invention. Front explanatory drawing which shows the contact lens as 4th embodiment of this invention. Explanatory drawing which shows only one side from a lens central axis in the XVIII-XVIII cross section of FIG. Explanatory drawing for demonstrating the manufacturing method of the contact lens shown in FIG. Front explanatory drawing which shows the contact lens as 5th embodiment of this invention. Front explanatory drawing which shows the contact lens as 6th embodiment of this invention. Front explanatory drawing which shows the contact lens as 7th embodiment of this invention. The longitudinal cross-sectional view which shows the lens attachment / detachment tool of a different aspect. Furthermore, the longitudinal cross-sectional view which shows the lens attachment / detachment tool of a different aspect. Cross-sectional explanatory drawing for demonstrating the aspect from which the internal state of magnetic metal powder differs.

Explanation of symbols

10: contact lens, 14: optical part, 16: peripheral part, 30: junction, 32: central part, 34: outer peripheral part, 36: boundary surface, 38: mark, 40: magnetic metal powder

Claims (10)

In a contact lens in which an optical part is provided in the center part of the lens and a peripheral part is provided around the optical part,
A contact lens in which magnetic metal powder is contained in a dispersed state in a predetermined region of the peripheral portion, and a visible mark is formed by the dispersed region of the magnetic metal powder.   The contact lens according to claim 1, wherein the lens central portion is formed of a hard material, and the lens outer peripheral portion is formed of a soft material having hydrophilicity.   The contact lens according to claim 1, wherein the magnetic metal powder is unevenly distributed in the lens circumferential direction.   The contact lens according to any one of claims 1 to 3, wherein the magnetic metal powder is contained over the entire circumference of the lens with a certain width in a lens radial direction.   The contact lens according to claim 1, wherein the magnetic metal powder is used in combination with a plurality of kinds of colors.   The contact lens according to any one of claims 1 to 5, wherein a colored one is used as the magnetic metal powder.   The contact lens according to claim 1, wherein the magnetic metal powder has a particle size of 1 nm to 5 μm.   Claim: Combined with a lens loading / unloading device comprising a sucker-like portion that is easily deformed and superimposed on the front surface of the lens, and a permanent magnet that forms a magnetic field on the surface of the sucker-like portion superimposed on the lens front surface. Item 8. The contact lens according to any one of Items 1 to 7.   The suction cup-shaped portion has an air hole that opens in the center of the overlapping surface on the front surface of the lens, and an air chamber is formed behind the suction cup-shaped portion to communicate the air hole. And an air release valve for connecting the air chamber to the atmosphere by applying an external force to the peripheral wall of the air chamber, and the permanent magnet is disposed in the air chamber. Contact lenses described in 1.   10. The contact lens according to claim 8, wherein the suction cup-shaped portion has a smaller outer diameter than the front surface of the lens, and the suction cup-shaped portion is superimposed on the front surface of the lens at the peripheral portion. .

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