WO2012131785A1

WO2012131785A1 - Contact lens package

Info

Publication number: WO2012131785A1
Application number: PCT/JP2011/001959
Authority: WO
Inventors: 山口　博之; 和孝高井; 田中　雅良; 章廣安田; 雅樹馬場
Original assignee: 株式会社メニコン
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2012-10-04
Also published as: JPWO2012131785A1

Abstract

Provided is a novel contact lens package suitable for a distribution package, etc., to house a contact lens and bring the contact lens to market. A contact lens package having a novel structure is provided with a press deformation action portion for compression deformation of a contact lens (18) housed in a housing region (12) together with a preservative solution (16) by applying a pressing force to the peripheral portion (36) of the lens, and an extension holding action portion for holding the lens in an extended state by applying a deformation prevention force to a central optical portion (34). Thereby, while the peripheral portion (36) of the contact lens (18) is actively press deformed to achieve reduction in size, local concentration of distortion, such as a crease, at the central optical portion (34) is avoided so that the optical property directly after opening the package can be stabilized.

Description

Contact lens package

The present invention relates to a contact lens package that contains a contact lens together with a storage solution, and more particularly to a contact lens package that is suitably used when distributing a soft contact lens to the market.

Contact lenses are manufactured by a lens manufacturer, housed in a sealed state in a contact lens package, distributed to the market, and provided to users from dealers.

Incidentally, a hydrous soft contact lens is generally provided in a contact lens package together with a storage solution. Such contact lens packages are conventionally formed on a container body made of a hard resin as described in JP-A-7-322911 (Patent Document 1) and US Pat. No. 4,691,820 (Patent Document 2). A blister package in which a storage solution and a contact lens are accommodated in the hollow and sealed with a cover film is employed.

However, the blister package having such a conventional structure must be formed with a sufficient depth to accommodate the contact lens, and it is difficult to make it compact. For this reason, for example, when a large number of contact lenses are stocked or when a plurality of contact lenses are carried around, it is bulky, and it is often inconvenient to handle.

Therefore, the applicant of the present invention previously disclosed in Japanese Patent No. 4586121 (Patent Document 3) is a contact having a novel structure in which a contact lens is housed in a reduced pressure state by pressing and deforming in the height direction (axial direction). A lens package was proposed. The contact lens package proposed in Patent Document 3 is made compact by using the softness and elasticity of a soft contact lens to a size that cannot be realized with a conventional blister package as described in Patent Documents 1 and 2. can do.

Japanese Unexamined Patent Publication No. 7-322911 US Pat. No. 4,691,820 Japanese Patent No. 4586121

As a result of further experiments and examinations of the contact lens package proposed in Patent Document 3, the contact lens package is opened and the contact lens is opened depending on conditions such as the material of the contact lens and the degree of pressure deformation. It was found that the distortion remaining in the contact lens when taken out may have an adverse effect immediately after wearing the contact lens.

That is, depending on the material such as the viscosity (viscoelasticity) of the contact lens and the environmental conditions such as the temperature, it was found that the strain in the pressed package state may remain after opening and may take time to recover. If the time required for strain recovery is long, wearing the contact lens immediately after opening the contact lens package may cause the user to feel that the appearance is poor.

The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that the contact lens is accommodated in a state of being pressed and deformed, and the appearance due to residual strain immediately after opening is achieved. It is an object of the present invention to provide a contact lens package having a novel structure capable of avoiding a decrease in the temperature as much as possible.

According to a first aspect of the present invention, there is provided a contact lens package in which a contact lens having an annular peripheral portion provided around a central optical portion is accommodated together with a preservative solution. The contact lens and the storage solution storage area are formed on the contact lens, and a pressing force in the lens axial direction, which is the overlapping direction of the first plate and the second plate, is applied to the peripheral portion of the contact lens. It is a contact lens package provided with a pressure deformation action part that compresses and deforms, and a stretch holding action part that exerts a deformation preventing force on the central optical part of the contact lens and holds it in a stretched state.

In the contact lens package of this aspect, in the contact lens, the shape of the contact lens is divided into two regions, a central optical part that exhibits optical characteristics such as vision correction and a peripheral part that does not affect the optical characteristics. Packaged. And in the peripheral part, the packaging deform | compacted in the lens axial direction was implement | achieved by carrying out the positive pressure deformation by the press deformation action part. On the other hand, the central optical unit has realized packaging that suppresses distortion by being held in a stretched state by a stretch holding action unit. As a result, it has become possible to realize a contact lens package having a novel structure that is compact in size, but that can effectively avoid defects in appearance due to residual distortion even when worn immediately after opening.

According to a second aspect of the present invention, in the contact lens package according to the first aspect, the stretch holding action portion restrains the outer peripheral side of the central optical portion of the contact lens by the pressing deformation action portion. The contact lens includes an outer peripheral restraining portion that prevents transmission of deformation to the central optical portion due to a pressing force exerted on the peripheral portion of the contact lens.

In the contact lens package of this aspect, by restraining the outer peripheral part of the central optical part, the distortion of the peripheral part is transmitted to the central optical part without exerting a large deformation preventing force directly on the entire central optical part. It is possible to suppress distortion of the central optical unit.

According to a third aspect of the present invention, in the contact lens package according to the first or second aspect, the stretch holding action portion is superimposed on at least one of a front surface and a back surface of the central optical portion of the contact lens. And a shape holding surface that defines the shape of the central optical portion.

In the contact lens package of this aspect, it is possible to directly suppress the distortion of the central optical unit by exerting a deformation restraining force on the surface of the central optical unit.

According to a fourth aspect of the present invention, there is provided the contact lens package according to any one of the first to third aspects, wherein the central optical portion of the contact lens is held in an inverted state by the stretch holding action portion. It is what.

In the contact lens package of this aspect, by reversing the front and back of the spherical contact lens, the axial dimension of the lens before pressing deformation can be made smaller than the normal state before reversing the front and back. In addition, the central optical part that is turned upside down is in a stretched state with a tensile force exerted on the entire surface, so that the central optical part is also in a stretched state when the peripheral part is pressed and deformed. It becomes easy to hold. Therefore, it is easy to realize a compact package size by pressing and deforming the peripheral part in the lens axial direction while avoiding local excessive deformation such as wrinkles in the central optical part and keeping the stretched state.

According to a fifth aspect of the present invention, there is provided the contact lens package according to any one of the first to fourth aspects, wherein the pressing deformation action portion has a pressing surface whose height in the lens axis direction changes in the circumferential direction. It is what it has.

In the contact lens package of this aspect, it is possible to set the shape when the peripheral portion is pressed and deformed to a form that changes in the lens axial direction so as to wave, for example, in the circumferential direction by the pressing surface of the pressing and deforming action portion. Become. Therefore, it is possible to disperse the strain over a wide area in the peripheral portion, avoiding the concentration of significant strain locally in the peripheral portion, and more effectively prevent the transmission of the strain to the central optical portion. In addition, it is possible to stabilize the shape of the peripheral part immediately after opening and to restore it more quickly.

As is clear from the above description, in the contact lens package having the structure according to the present invention, the peripheral portion is positively pressed by the pressing deformation action portion while preventing the local excessive deformation to the central optical portion by the stretch holding action. Can be pressed and deformed.

Therefore, in the contact lens package according to the present invention, it is possible to realize a large size reduction by thinning, and thereby, the convenience of carrying a large number of stocks and carrying can be greatly improved, and when worn immediately after opening the package However, the desired optical characteristics can be sufficiently stably exhibited in the central optical section, and a good wearing feeling can be realized.

1 is a longitudinal sectional view of a contact lens package as a first embodiment of the present invention. It is explanatory drawing which shows the single item of the contact lens accommodated in the contact lens package shown by FIG. 1, Comprising: (a) is longitudinal cross-sectional explanatory drawing, (b) is plane explanatory drawing. (A) is a perspective view which shows roughly the press deformation state of the contact lens accommodated in the contact lens package shown by FIG. 1, (b) is a pair of flat plate for the whole contact lens. It is a reference perspective view which shows the state pressed and deform | transformed by pinching. The longitudinal cross-sectional view of the contact lens package as 2nd embodiment of this invention. The longitudinal cross-sectional view of the contact lens package as 3rd embodiment of this invention. FIG. 8 is a vertical cross-sectional view taken along the line VI-VI in FIG. 7, showing a contact lens package according to a fourth embodiment of the present invention. The top view which shows the single item of the bottom side member which comprises the contact lens package shown by FIG. The longitudinal cross-sectional view of the contact lens package as 5th embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional explanatory view exemplarily showing a single contact lens housed in a contact lens package according to the present invention in an inverted state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a contact lens package 10 as an embodiment of the present invention. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

The contact lens package 10 has a package main body 14 that is a case-like or bag-like structure having an accommodation region 12 formed therein. A storage liquid 16 is sealed in the storage area 12 having a hollow structure in the package body 14, and a soft type contact lens 18 is immersed in the storage liquid 16 and stored.

More specifically, the package body 14 includes a bottom plate 20 as a first plate and a lid plate 22 as a second plate.

The bottom plate 20 has a planar shape larger than the DIA (outer diameter dimension) of the contact lens 18, and is provided with an accommodation recess 24 that is open at the center thereof. The housing recess 24 has a substantially circular planar opening shape having an inner diameter dimension slightly larger than DIA of the contact lens 18 to be housed. In particular, in the present embodiment, the bottom plate 20 has a rotationally symmetric shape around the central axis extending in the vertical direction, and the housing recess 24 also has a rotationally symmetric shape.

In the present embodiment, the center portion of the bottom wall of the receiving recess 24 is a circular flat plate-shaped center bottom wall 26. The outer peripheral portion of the bottom wall of the housing recess 24 is an outer peripheral bottom wall 28 that extends in the circumferential direction with a curved arcuate cross section that protrudes upward.

On the other hand, the entire lid side plate 22 has a thin plate shape, and the lid side plate 22 is superimposed on the upper surface of the bottom side plate 20. And the lid side plate 22 is piled up in close contact with the gutter plate portion 29 that spreads in a plate shape from the peripheral edge of the opening of the accommodation recess 24 in the bottom side plate 20, and is welded or bonded. It is fixed fluid tightly. Thereby, the opening of the accommodation recess 24 of the bottom side plate 20 is covered with the lid side plate 22, and the accommodation area | region 12 sealed with respect to external space is defined.

The material of the bottom side plate 20 and the lid side plate 22 is not particularly limited, and various synthetic resin materials, metal materials, and the like can be used. Preferably, the bottom plate 20 is made of a synthetic resin material such as polyethylene, polyvinyl chloride, polypropylene, and polyamide because of its ease of molding into a target shape. Further, as the lid side plate 22, a soft resin film or a laminate film in which a resin layer such as polypropylene is attached to an aluminum layer is suitably employed because of the ease of sealing processing and opening operation. In addition, in one or both of the bottom side plate 20 and the lid side plate 22, a contact sealed in the hermetically sealed housing region 12 by providing a transparent portion on at least a part of the wall portion that defines the housing region 12. The lens 18 may be visually confirmed from the outside.

Incidentally, the contact lens 18 accommodated in the accommodation region 12 of the package body 14 is not particularly limited with respect to its material and optical characteristics as long as it can be elastically deformed. For example, in addition to the HEMA ionic high water content soft contact lens, a contact lens made of a material having a relatively high viscosity such as a silicone hydrogel soft contact lens having a silicone component may be employed.

As is well known, the contact lens 18 has a shape substantially corresponding to the shape of the wearer's cornea surface. Specifically, for example, as shown in FIGS. 2 (a) and 2 (b), a contact lens in an equilibrium state in which an external force is not exerted by being immersed in a solution having a substantially equal specific gravity such as a storage solution. The unit shape of 18 is a substantially spherical crown shape having a curved convex surface 30 as a front surface and a curved concave back surface 32 as a rear surface. The contact lens 18 is formed with a central optical part 34 that exhibits a vision correction function at a central part that covers the wearer's pupil, and an outer peripheral side of the central optical part 34 contributes to wearing stability and the like. Part 36 is designated. An edge 38 is provided on the outer peripheral edge of the peripheral portion 36 over the entire circumference. The central optical unit 34 is set with appropriate optical characteristics suitable for the wearer.

In the package main body 14, the outer diameter dimension of the center bottom wall 26 of the bottom plate 20 is made larger than the outer diameter dimension of the center optical portion 34 of the contact lens 18 to be accommodated. Further, the depth dimension of the housing recess 24 in the housing area 12 is set to be smaller than the axial height dimension (H) in the equilibrium state of the contact lens 18 in the central deepest portion (the central bottom wall 26 portion). Yes. Furthermore, in the outer peripheral bottom wall 28 portion, the minimum depth dimension of the housing recess 24 is set to be substantially the same as the thickness dimension of the peripheral portion 36 of the contact lens 18 at the top of the bottom surface of the outer peripheral bottom wall 28. The thickness is preferably equal to or less than the thickness of the peripheral portion 36.

As a result, the contact lens 18 accommodated in the accommodation region 12 of the package main body 14 has its peripheral portion 36, the outer peripheral bottom wall 28 of the bottom side plate 20 and the lid side plate 22 as shown in FIG. Are pressed and deformed so as to be squeezed in the vertical direction which is the lens axis direction (optical center axis direction). Thereby, the contact lens 18 is housed and disposed in the housing region 12 in a compressed state in which the lens height dimension (H) in the equilibrium state shown in FIG.

On the other hand, the central optical portion 34 of the contact lens 18 is subjected to a deformation prevention force by holding the peripheral portion 36 located on the outer peripheral side thereof sandwiched between the bottom side plate 20 and the lid side plate 22. It is housed in a stretched state. That is, the central optical unit 34 is restrained over the entire circumference on the outer peripheral side thereof, so that the deformation is prevented by tension, and distortion and stress are also transmitted from the peripheral unit 36 to the central optical unit 34. It is in a blocked state.

The stretched state refers to a state in which local bending such as wrinkles does not occur and is maintained in a substantially spherical crown shape as a whole, and tension or pressing force is exerted compared to an equilibrium state. Including a state where the radius of curvature is slightly changed overall. Further, as is clear from the above description, in the present embodiment, the outer peripheral bottom wall 28 of the bottom side plate 20 and the lid side plate 22 that opposes the peripheral portion 36 of the contact lens 18 in a position opposite thereto. A pressing deformation acting part is configured. Furthermore, the central optical part 34 of the contact lens 18 is held in the stretched state by the vicinity of the top part of the outer peripheral bottom wall 28 in the bottom side plate 20 and the lid side plate 22 that sandwiches the peripheral part 36 of the contact lens 18 opposed thereto. A stretch holding action portion is configured.

In particular, in the present embodiment, the depth dimension (h) of the central portion of the accommodation region 12 is made larger than the height dimension in the lens axis direction of the central optical unit 34 in the extended state in the package body 14. The central optical unit 34 is pressed against both the upper and lower lid-side plates 22 and the central bottom wall 26 (bottom-side plate 20) in a state where the outer peripheral side is sandwiched and suspended over the entire circumference. It is arranged in a state that can not be. More preferably, the central optical unit 34 is arranged at a middle portion in the depth direction in the accommodation region 12 so as to be separated from both the upper and lower lid side plates 22 and the central bottom wall 26 (bottom side plate 20). Has been. Thereby, in the central optical unit 34, the occurrence of locally concentrated distortion is further effectively prevented.

Therefore, in the contact lens package 10 of the present embodiment, the peripheral portion 36 is maintained while the central optical portion 34 of the contact lens 18 is held in a stretched state to prevent local excessive bending such as wrinkles as much as possible. Thus, the contact lens 18 can be accommodated in a compressed state in which the size in the lens axial direction is reduced. As described above, since the contact lens 18 is accommodated in a compressed state, the thickness dimension is significantly larger than that of a conventional blister package in which the contact lens is immersed and stored in an uncompressed floating state (equilibrium state). The contact lens package 10 can be stocked with excellent space efficiency in a state in which a plurality of contact lens packages 10 are overlapped, or one or several contact lens packages 10 can be easily carried in a pass case or the like. .

Furthermore, since excessive local bending in the central optical unit 34 is avoided in the lens accommodation state, residual distortion that is a problem in optical characteristics can be effectively avoided. Therefore, even if the contact lens 18 is made of a material having high viscoelasticity, even if the contact lens 18 is worn immediately after the contact lens package 10 is opened, the intended optical characteristics can be obtained. That is, in the unopened state of the contact lens package 10 according to the present embodiment, the contact lens 18 is largely deformed locally by being pressed and deformed at the peripheral portion 36 as shown in FIG. In the central optical unit 34, local strain concentration such as wrinkles can be avoided and the stretched state can be maintained. Incidentally, when the contact lens 18 is pressed and deformed by being crushed by a pair of substantially flat plates from both sides in the lens central axis direction, as shown in FIG. It has also been confirmed by the present inventors that large bending, wrinkles and the like are likely to occur.

Further, since the central optical unit 34 is accommodated in a state where the expansion is maintained, the contact lens 18 including the central optical unit 34 can be effectively protected from an external force exerted from the outside of the package body 14.

Furthermore, in the present embodiment, a stretch holding action portion that partially utilizes a pressing deformation action portion that exerts a pressing force on the peripheral portion 36 of the contact lens 18 to prevent local deformation of the central optical portion 34 of the contact lens 18. Therefore, the shape and structure of the package main body 14 can be simplified, and the manufacture is facilitated.

The first embodiment of the present invention has been described in detail above, but the present invention is limited only by the specific description in such an embodiment and the specific description in other embodiments additionally exemplified below. It is not interpreted. In the description of the embodiments described below, members and parts having the same structure as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment. , Omit their detailed description.

FIG. 4 shows a contact lens package 40 as a second embodiment of the present invention. In the contact lens package 40 of the present embodiment, the bottom plate 20 and the lid plate 22 are overlapped with the presser plate 42 interposed therebetween.

The presser plate 42 has a flat plate shape as a whole. In particular, in this embodiment, the presser plate 42 has an annular flat plate shape in which an opening window 44 is provided in the center portion. The presser plate 42 has its outer peripheral portion overlapped in close contact between the bottom plate 20 and the lid plate 22 on the outer peripheral side of the opening of the receiving recess 24 of the bottom plate 20. It is fixed fluid tightly by welding or the like. On the other hand, the inner peripheral portion of the holding plate 42 extends inward from the peripheral edge of the opening of the receiving recess 24 of the bottom plate 20 and is opposed to the outer peripheral bottom wall 28 of the bottom plate 20 in the lens axial direction. It is set as the press part 46 to do. The outer surface of the presser plate 42 is overlapped with the lid side plate 22 in a close contact state over the entire surface.

Then, the contact lens 18 is compressed by the peripheral portion 36 of the contact lens 18 being pressed and deformed in the lens axial direction between the opposed surfaces of the outer peripheral bottom wall 28 of the bottom plate 20 and the pressing portion 46 of the presser plate 42. In the state, it is accommodated in the accommodation area 12. In addition, the outer peripheral side of the central optical part 34 of the contact lens 18 is sandwiched between the opposed surfaces of the outer peripheral bottom wall 28 and the pressing part 46 in the vicinity of the top of the outer peripheral bottom wall 28 of the bottom plate 20, so that the central optical The part 34 is held in the extended state.

In the contact lens package 40 of the present embodiment, in addition to the same effects as those of the first embodiment, the pressing deformation action portion and the stretch holding action portion are connected to the outer peripheral bottom wall 28 of the bottom plate 20. Since it is constituted by the presser plate 42, while sufficiently securing the pressing deformation action to the peripheral part 36 of the contact lens 18 and the stretched state holding action to the central optical part 34 based on the member rigidity of the presser plate 42, It is also possible to configure the lid side plate 22 with a thin and low-rigidity resin film or the like, thereby further facilitating the opening operation by peeling the lid side plate 22. In addition, by making the central part of the lid side plate 22 transparent, it is possible to confirm the presence and state of the contact lens 18 in the accommodation region 12 through the opening window 44 of the presser plate 42 when the contact lens package 40 is not opened. Also good.

FIG. 5 shows a contact lens package 50 as a third embodiment of the present invention. In the contact lens package 50 of the present embodiment, the shape of the outer peripheral bottom wall 28 of the bottom plate 20 is different from that of the contact lens package 40 of the second embodiment.

More specifically, a constraining protrusion 52 extending in the circumferential direction along the inner peripheral portion is formed on the outer peripheral bottom wall 28 of the bottom plate 20 of the present embodiment so as to protrude into the accommodating recess 24 with a mountain-shaped cross-sectional shape. ing. The outer peripheral side of the restraining projection 52 is a deep bottom portion 54 that spreads with a sufficient depth to be substantially equal to the central bottom wall 26.

Then, the accommodated contact lens 18 is supported by sandwiching the outer peripheral side of the central optical portion 34 between the protruding tip portion of the restraining protrusion 52 and the presser plate 42. In short, in the present embodiment, the outer peripheral restraint portion is configured by the restraint protrusion 52 and the presser plate 42.

On the other hand, the peripheral portion 36 of the contact lens 18 is pressed down from above by the presser plate 42, so that the lower side is pressed and deformed without being regulated by the bottom plate 20, and is compressed in the lens axial direction. Therefore, relatively free deformation and stress distribution are allowed in the peripheral portion 36 even when the contact lens 18 is accommodated, and local bending due to pinching pressure is reduced. Yes.

FIG. 6 shows a contact lens package 60 as a fourth embodiment of the present invention. In the contact lens package 60 of the present embodiment, the shape of the outer peripheral bottom wall 28 of the bottom plate 20 is different from that of the contact lens package 50 of the third embodiment.

Specifically, as shown in FIG. 7, the outer peripheral bottom wall 28 of the bottom plate 20 of the present embodiment is formed with a constraining protrusion 52 extending in the circumferential direction along the inner peripheral portion. On the outer peripheral side of the restraining projection 52, a plurality of lower side clamping holding portions 62 projecting into the housing recess 24 are provided at predetermined intervals in the circumferential direction. The outer peripheral bottom wall 28 is a deep bottom portion 54 in the region between the lower clamping

pressure holding portions

62 and 62 adjacent in the circumferential direction.

On the other hand, the presser plate 42 is formed with an upper clamping holding portion 64 that protrudes toward the bottom plate 20 at a portion facing the outer peripheral bottom wall 28 of the bottom plate 20. The opposing surfaces of the lower clamping holding portion 62 of the bottom plate 20 and the upper clamping holding portion 64 of the pressing plate 42 are separated by a distance corresponding to the approximate thickness dimension of the peripheral portion 36 of the contact lens 18. The lower pressing surface 66 and the upper pressing surface 68 are opposed to each other.

The lower pressing surface 66 and the upper pressing surface 68 are provided with a corresponding appropriate curved shape such as a waveform as shown in FIG. 6, and from both sides with the peripheral portion 36 of the contact lens 18 interposed therebetween. By being superposed, it is possible to exert a pressing force in the lens axial direction while defining the shape with respect to the peripheral portion 36 of the contact lens 18. Note that the upper clamping pressure holding portion 64 and the upper pressing surface 68 may be formed only in a portion facing the lower clamping pressure holding portion 62 and the lower pressing surface 66, but the entire circumference of the pressing plate 42 is covered. Therefore, it is preferable that positioning in the circumferential direction when the presser plate 42 is overlapped with the bottom plate 20 is unnecessary.

In the contact lens package 60 of the present embodiment, the peripheral portion 36 of the contact lens 18 is lifted upward at a predetermined interval on the periphery by the lower holding pressure holding portion 62 that is formed to protrude at a predetermined interval in the circumferential direction, and the upper nipping The shape is held with respect to the pressure holding portion 64 and positioned. That is, in this embodiment, the pressing surface to the peripheral part 36 by the outer peripheral bottom wall 28 changes with different heights in the circumferential direction. Thereby, it is possible to positively develop the compressed shape after the presser deformation with a shape that undulates in the circumferential direction with respect to the peripheral portion 36. Then, it is possible to reduce the local wrinkles and bending by efficiently dispersing the distortion of the peripheral portion 36 that has been deformed by pressing in the entire circumferential direction.

FIG. 8 shows a contact lens package 70 as a fifth embodiment of the present invention. In the contact lens package 70 of the present embodiment, the shape of the central bottom wall of the bottom plate 20 is different from that of the contact lens package 50 of the third embodiment, and the pressing plate 42 is not employed. The shape of the lid side plate 22 is different.

Specifically, the central bottom wall of the bottom plate 20 of the present embodiment is a lower-constraint holding portion 72 having a spherical crown shape over substantially the entire surface thereof. On the other hand, the lid side plate 22 is provided with an upper side restraint holding part 74 that protrudes toward the bottom side plate 20 side in a central portion facing the lower side restraint holding part 72 of the bottom side plate 20.

The opposing surfaces of the lower restraint holding portion 72 and the upper restraint holding portion 74 have a spherical crown concave lower shape holding surface 76 and a spherically convex upper shape holding shape formed with substantially corresponding curvature radii. The surface 78 is used. The lower shape holding surface 76 and the upper shape holding surface 78 are opposed to each other with a distance corresponding to a substantially thickness dimension of the central optical portion 34 of the contact lens 18.

In the contact lens package 70 of the present embodiment, the lower restraint holding portion 72 and the upper restraint holding portion 74 are overlapped from the upper and lower sides at the central portion including the central optical portion 34 with respect to the accommodated contact lens 18. Yes. The central portion including the central optical part 34 of the contact lens 18 is sandwiched between the lower shape holding surface 76 and the upper shape holding surface 78 over substantially the entire shape and held from both sides.

As a result, a deformation restraining force can be directly applied to the central optical part 34 of the contact lens 18 in which particularly distorted deformation is a problem, and the central optical part 34 is more effectively held in the stretched state. To get.

Although not listed one by one, various changes, modifications, improvements and the like can be added to the present invention based on the knowledge of those skilled in the art. For example, the contact lens 18 is known to have shape stability even when the front and back sides are reversed, but as shown in FIG. 9, the front and back sides are reversed (the curved convex surface 30 and the curved surface in FIG. 2). In the state in which the concave back surface 32 is inverted to the curved concave surface 30 and the curved convex back surface 32 in FIG. 9, respectively, the height dimension (H ′) of the contact lens 18 in the lens axial direction is normal. It becomes smaller than the state (see FIG. 2). In addition, as a result of confirmation by the present inventor, in a state where the front and back surfaces are reversed, a tensile stress is generated on the entire curved convex back surface 32 of the central optical unit 34. It was found that the local distortion concentration tends to be suppressed more easily than the normal state. By utilizing such characteristics, the contact lens package is configured by being housed in the package body 14 as described in the first to fifth embodiments while the central optical portion 34 of the contact lens 18 is in the inverted state. It is also possible to do. Thereby, the thickness of the package can be further reduced while avoiding the occurrence of excessive distortion such as wrinkles in the central optical unit 34.

Furthermore, the specific shape, specific arrangement mode, etc. of the pressure deformation action part and the stretch holding action part in the present invention are appropriately set in consideration of the type of the contact lens 18 and the amount of pressure deformation, It should not be interpreted in a limited way. For example, in the first embodiment and the second embodiment, a pressing deformation action that exerts a pressing force on the peripheral portion 36 of the contact lens 18, which is configured by the bottom side plate 20 and the lid side plate 22 or the pressing plate 42. The portion is formed continuously over the entire circumference in the circumferential direction, but may be formed partially or intermittently on the circumference. Further, a portion that sandwiches the peripheral portion 36 of the contact lens 18 by the bottom side plate 20 and the lid side plate 22 or the presser plate 42 that constitutes the pressing deformation acting portion is separated by a predetermined distance in the radial direction of the contact lens 18. It is also possible to provide a plurality of strips extending in the circumferential direction.

In addition, for example, in the third embodiment, the stretch holding action portion configured to hold the outer peripheral side of the central optical portion 34 of the contact lens 18 and apply a restraining force, which is configured by the restraining protrusion 52 and the presser plate 42, is also circumferential. The contact lens 18 may be partially or intermittently formed, and a plurality of strips may be provided so as to extend in the circumferential direction at a predetermined distance in the radial direction of the contact lens 18.

Further, as described above, the holding pressure holding portion to the peripheral portion 36 of the contact lens 18 that constitutes the pressing deformation action portion and the expansion holding action portion is not necessarily formed on the circumference concentric with the contact lens 18. However, it may be formed so as to extend continuously or intermittently on a circumference such as an ellipse or a polygon.

In addition, for example, the pressing deformation acting portions on the peripheral portion 36 of the contact lens 18 constituted by the lower holding pressure holding portion 62 and the upper holding pressure holding portion 64 in the fourth embodiment are also the same size in the circumferential direction. It is not necessary to have a shape, and the circumferential interval need not be constant.

Furthermore, for example, in the fifth embodiment, the

shape holding surfaces

76 and 78 for the central optical unit 34 of the contact lens 18, which are configured by the lower constraint holding unit 72 and the upper constraint holding unit 74, are also included in the central optical unit 34. It is not necessary to provide it over the entire surface, and it is also possible to hold the whole in a stretched state by forming it partially on the central optical part 34 and partially restraining the central optical part 34. Further, the upper and lower

restraint holding portions

72 and 74 do not necessarily need to be used in combination, and the shape holding surface may be constituted by only one of the upper and lower sides depending on conditions such as the material of the contact lens 18.

Further, the stretch holding action part does not need to exert a deformation preventing force on the entire central optical part 34 of the contact lens 18, and the pressing deformation action part also causes the entire peripheral part 36 of the contact lens 18 to extend in the lens axial direction. There is no need to compress and deform. Specifically, for example, when the outer diameter dimension of the central optical unit 34 is 8.0 mm, the deformation prevention force by the stretch holding action unit is applied to the central region of the central optical unit 34 (for example, 6.0 mm or 7.0 mm). On the other hand, the peripheral portion 36 including the outer peripheral region of the central optical portion 34 may be compressed and deformed by the pressing deformation acting portion. In particular, the portion that exhibits important optical characteristics under the wearing state of the contact lens 18 is the central region of the central optical unit 34, and the peripheral region of the central optical unit 34 also has little influence on the optical characteristics of the eye optical system. . Therefore, by compressing and deforming the outer peripheral region of the central optical unit 34, the contact lens 18 can be more compactly deformed and compressed while effectively avoiding adverse effects on the optical characteristics of the contact lens 18 immediately after opening. It can also be accommodated.

10, 40, 50, 60, 70: contact lens package, 12: storage area, 16: storage solution, 18: contact lens, 20: bottom side plate (first plate), 22: lid side plate (second plate) , 34: central optical part, 36: peripheral part, 76: lower shape holding surface, 78: upper shape holding surface

Claims

In a contact lens package containing a contact lens provided with an annular peripheral part around a central optical part together with a storage solution,
Forming the contact lens and the storage region for the storage solution between the overlapping surfaces of the first plate and the second plate;
A pressing deformation acting portion that compresses and deforms the peripheral portion of the contact lens by applying a pressing force in a lens axial direction that is an overlapping direction of the first plate and the second plate;
A stretch holding action portion that exerts a deformation preventing force on the central optical portion of the contact lens and holds the contact lens in a stretched state;
A contact lens package characterized by comprising:
The expansion holding action part restrains the outer peripheral side of the central optical part of the contact lens, and the deformation of the central optical part due to the pressing force exerted on the peripheral part of the contact lens by the pressing deformation action part. The contact lens package of Claim 1 comprised including the outer periphery restraint part which blocks | prevents transmission.
2. The stretch holding action portion includes a shape holding surface that is superimposed on at least one of a front surface and a back surface of the central optical portion of the contact lens and defines a shape of the central optical portion. Or the contact lens package of 2.
The contact lens package according to any one of claims 1 to 3, wherein the central optical portion of the contact lens is held in an inverted state by the stretch holding action portion.
The contact lens package according to any one of claims 1 to 4, wherein the pressing deformation operating portion includes a pressing surface whose height in the lens axis direction changes in the circumferential direction.