WO2017204309A1 - 光学素子、光学素子版構造、印刷物及び光学素子の製造方法 - Google Patents
光学素子、光学素子版構造、印刷物及び光学素子の製造方法 Download PDFInfo
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- WO2017204309A1 WO2017204309A1 PCT/JP2017/019611 JP2017019611W WO2017204309A1 WO 2017204309 A1 WO2017204309 A1 WO 2017204309A1 JP 2017019611 W JP2017019611 W JP 2017019611W WO 2017204309 A1 WO2017204309 A1 WO 2017204309A1
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- Prior art keywords
- lens
- optical element
- divided
- lenses
- split
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00269—Fresnel lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00278—Lenticular sheets
- B29D11/00288—Lenticular sheets made by a rotating cylinder
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
Definitions
- the present invention relates to an optical element, an optical element plate structure, a printed material, and a method for manufacturing an optical element.
- the present invention is used for a film-like material such as an embossed film having a split lens shape formed on the surface and having a special optical effect. It is related to a product that can be manufactured with high quality without defects and with high productivity.
- a resin is applied to the surface of a plate cylinder having a regular concavo-convex shape formed on the surface, and a continuously running film is sandwiched between a plate cylinder and an impression cylinder, and the plate cylinder In the state where the resin is in contact with the film, ionizing radiation is applied to the resin to cure, and then the film is wound on a peeling roll and then peeled off from the plate cylinder.
- Japanese Patent Laid-Open No. 2001-62853 discloses that a resin is previously applied to the surface of a continuously running film, and this film is sandwiched between a plate cylinder and an impression cylinder on which a regular lens shape is formed.
- a technique is disclosed in which the resin is irradiated with ionizing radiation in a state in which the uneven shape of the plate cylinder is transferred to the resin, and then the film is wound around a peeling roll and peeled off from the plate cylinder.
- the present invention has been made in view of such circumstances, and an optical element suitable for manufacturing a high-quality and high-productivity product by suppressing defects further with respect to an optical element having a split lens structure formed on the surface.
- An object is to provide an element, a printed matter, an optical element plate structure, a printed matter, and a method for producing the optical element.
- the first invention has a split lens structure in which the optical element includes a transparent base material and a plurality of split lenses provided on the transparent base material and partitioned by the split lens surface. It is formed between a lens layer made of a transparent material and the plurality of divided lenses, has a constant structure height, and is 50% to 120% of the height of the highest part of the divided lens structure. It is equipped with a rib part.
- the first invention even if roll forming is performed at a high speed, it is possible to promote resin flow and suppress the entrapment of bubbles, so that there are few structural defects and productivity can be increased. .
- the second invention is the optical element, wherein the divided lens structure is any one of a blazed structure, a linear Fresnel lens structure, and a cylindrical lens array structure, and the divided lenses are arranged in parallel.
- the rib portion is formed linearly in a direction orthogonal to the divided lens surface.
- an optical element with few defects is provided in a structure including a linear segmented lens structure of any one of a blazed structure, a linear Fresnel lens structure, and a cylindrical lens array structure.
- the third invention includes an optical element, wherein the divided lens structure is a Fresnel lens structure or a micro Fresnel lens array structure, and the divided lenses are arranged concentrically.
- the rib portion is formed in a straight line passing through the center of each concentric circle of the split lens.
- the Fresnel lens structure or the micro Fresnel lens array structure is used, and the rib portion or the groove portion is a linear structure that passes through the center of each Fresnel lens structure. An optical element with less is provided.
- the rib portion is formed narrower on the outer peripheral side of the concentric circle.
- the molded resin goes around the split lens structure, and the molding rate is improved.
- a fifth invention is a lens-shaped intaglio comprising an optical element plate structure comprising a transparent base material and a plurality of divided lenses provided on the transparent base material and partitioned by a split lens surface.
- the fifth invention even if roll forming is performed at a high speed, it is possible to promote resin flow and suppress the entrapment of bubbles, so that there are few structural defects and productivity can be increased. .
- the sixth invention is an optical element plate structure, wherein the lens-shaped intaglio part is any one of a blazed structure, a linear Fresnel lens structure, and a cylindrical lens array structure, and the divided lens is Including a structure arranged in parallel, the groove is linearly formed in a direction orthogonal to the divided lens surface.
- an optical element with few defects is provided in a structure including a linear segmented lens structure of any one of a blazed structure, a linear Fresnel lens structure, and a cylindrical lens array structure.
- the lens-shaped intaglio part has a Fresnel lens structure or a micro-Fresnel lens array structure, and the divided lenses are arranged concentrically.
- the groove is formed in a straight line that passes through the center of each concentric circle of the split lens.
- the Fresnel lens structure or the micro Fresnel lens array structure is used, and the rib portion is a linear structure that passes through the center of each Fresnel lens structure. Fewer optical elements are provided.
- the width of the groove is formed narrow on the outer peripheral side of the concentric circle.
- the molding resin since the fluidity along the groove of the molding resin is lowered, the molding resin goes around the split lens structure and the molding rate is improved.
- the printed matter includes the above-described optical element.
- the seventh invention by using the optical elements of the first to fourth inventions, a printed matter having an excellent optical effect can be provided at a lower cost.
- the tenth invention is an optical element manufacturing method including a split lens structure having a plurality of split lenses partitioned by a split surface, the transparent base A material film is supplied, a transparent resin is supplied to a surface of the base film on which the divided lens structure is formed, and a plate structure corresponding to the plurality of divided lenses is formed between the plate structures.
- the base film is pressed by a roll into a mold roll having a constant depth and a groove part having a depth of 50% to 120% of the depth of the lowest part of the plate structure. Then, the resin is cured, and the base film is peeled off from the mold roll.
- a method for manufacturing an optical element is provided. Thereby, roll forming of an optical element is attained.
- the groove portion is set so that the width thereof is narrower with respect to the flow direction of the transparent resin.
- the fluidity along the groove portion of the molding resin is lowered, so that the molding resin wraps around the split lens structure and the molding rate is improved.
- FIG. 1 is a perspective view showing a main part of an optical element according to the first embodiment of the present invention.
- FIG. 2 is an explanatory view schematically showing a manufacturing apparatus for manufacturing the optical element.
- FIG. 3 is a perspective view showing a main part of the plate structure incorporated in the manufacturing apparatus.
- FIG. 4 is a perspective view showing a main part of an optical element according to the second embodiment of the present invention.
- FIG. 5 is a perspective view showing a plate structure corresponding to the optical element.
- FIG. 6 is a perspective view showing a main part of an optical element according to the third embodiment of the present invention.
- FIG. 7 is a plan view showing an optical element according to the fourth embodiment of the present invention.
- FIG. 8 is a plan view showing an optical element according to the fifth embodiment of the present invention.
- FIG. 9 is a plan view showing an optical element according to the sixth embodiment of the present invention.
- FIG. 10 is a plan view showing an optical element according to the seventh embodiment of the present invention.
- FIG. 11 is a plan view showing an optical element according to the eighth embodiment of the present invention.
- FIG. 12 is a plan view showing an optical element according to the ninth embodiment of the present invention.
- FIG. 1 is a perspective view showing a main part of an optical element 10 according to the first embodiment of the present invention
- FIG. 2 is an explanatory view schematically showing a manufacturing apparatus 100 for manufacturing the optical element 10
- FIG. 3 is a perspective view showing a main part of a plate structure 200 incorporated in the manufacturing apparatus 100.
- the optical element 10 has a lens layer 12 made of a transparent material on a transparent substrate (substrate film) 11.
- a split lens structure 20 and a rib portion 40 are formed on the lens layer 12.
- An ultraviolet curable resin R is used as the material of the lens layer 12.
- the split lens structure 20 includes a plurality of split lenses 30, and the split lenses 30 include a reflecting surface 31 and a split lens surface 32 that partitions the split lens 30.
- the rib portion 40 is formed across the plurality of split lenses 30.
- the rib portion 40 extends in a direction perpendicular to the surface of the split lens surface 32.
- the vertical direction is defined as the height.
- the height of the highest part of the split lens structure 20 and the height of the rib part 40 are equal, and the apex is shared.
- the structural depth refers to a component in a direction perpendicular to the surface of the transparent base material 11 facing the transparent base material 11 side with the highest position of the split lens structure 20 as a reference.
- Various materials can be used as the material of the transparent substrate 11, and polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyester, polyolefin, acrylic, polystyrene, polycarbonate, polyamide, PET (polyethylene terephthalate) Biaxially stretched polyethylene terephthalate, polyethylene naphthalate, polyamideimide, polyimide, aromatic polyamide, cellulose acylate, cellulose triacetate, cellulose acetate propionate, cellulose diacetate, and the like can be used.
- a material of the transparent substrate 11 a film or sheet made of a resin having high light transmittance is suitable.
- the transparent substrate 11 is not limited to a single layer configuration, and may have a configuration of two or more layers. However, when curing by ultraviolet rays (ionizing radiation) is performed from the transparent substrate 11 side, it is necessary to use a material that transmits the ultraviolet rays to be irradiated.
- ultraviolet rays ionizing radiation
- the width of the transparent base material 11 0.1 to 1.5 m is generally adopted.
- the length of the transparent substrate 11 is generally 100-100,000 m.
- the thickness of the transparent substrate 11 is generally 12 to 250 ⁇ m.
- the transparent substrate 11 is not limited to these dimensions.
- a resin having visible light permeability can be used as the material of the lens layer 12.
- the resin having visible light permeability include acrylic, polycarbonate, epoxy, polyethylene, and polypropylene.
- the thickness of the lens layer 12 can be 1 ⁇ m or more and 100 ⁇ m or less.
- the lens layer 12 including the divided lens structure 20 in which the unevenness is reversed from the plate structure 200 is easily produced by transfer using the plate structure 200 described later. Can do.
- an ultraviolet curable resin R with little deformation of the shape after molding, no cooling process, and high productivity was used.
- the ultraviolet curable resin R include radicals and cations capable of reacting a reactive group-containing compound such as a (meth) acryloyl group, a vinyl group, and an epoxy group with an ionizing radiation such as an ultraviolet ray.
- Those containing compounds that generate active species such as
- a combination of a reactive group-containing compound (monomer) containing an unsaturated group such as a (meth) acryloyl group or a vinyl group and a radical photopolymerization initiator that generates a radical by light is preferable.
- (meth) acryloyl group-containing compounds such as (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, and polyester (meth) acrylate are preferable.
- this (meth) acryloyl group-containing compound a compound containing one or more (meth) acryloyl groups can be used.
- the reactive group containing compound (monomer) containing unsaturated groups such as said acryloyl group and a vinyl group, may be used independently or may be used in mixture of multiple types as needed.
- the radical photopolymerization initiator various commercially available products can be used.
- the radical photopolymerization initiator is preferably blended in the total composition in an amount of 0.01 to 10% by weight, particularly 0.5 to 7% by weight.
- the upper limit of the blending amount is preferably this range from the viewpoints of the curing characteristics of the composition, the mechanical properties and optical characteristics of the cured product, handling, and the like, and the lower limit of the blending amount is preferable from the viewpoint of preventing the curing rate from being lowered.
- the UV curable resin R is used as various additives as necessary, for example, antioxidants, UV absorbers, light stabilizers, silane coupling agents, coating surface improvers, thermal polymerization inhibitors, leveling agents, surfactants, and coloring.
- An agent, a storage stabilizer, a plasticizer, a lubricant, a solvent, a filler, an anti-aging agent, a wettability improver, a release agent, and the like can be blended as necessary.
- the manufacturing apparatus 100 includes a transport mechanism 110 that transports the film-like transparent substrate 11 as a mechanism unit. Further, a resin supply unit 120, a heating unit 130, an ultraviolet curable resin transfer molding mechanism 140, and a peeling mechanism 150 are provided along the flow of the transparent substrate 11.
- Resin supply unit 120 supplies uncured ultraviolet curable resin R onto transparent substrate 11.
- the heating unit 130 heats the ultraviolet curable resin R and performs preliminary curing.
- the ultraviolet curable resin transfer molding mechanism 140 includes a mold roll 141, a pressing roll 142 that presses the transparent substrate 11 toward the mold roll 141, and an ultraviolet irradiation unit 143 that irradiates and cures the ultraviolet curable resin R with ultraviolet rays. Yes.
- As the ultraviolet irradiation unit 143 a discharge lamp such as a mercury lamp or a metal halide lamp can be used.
- the LED irradiation part etc. which have the light emission wavelength of an ultraviolet region can be used for the ultraviolet irradiation part 143, it is necessary to select the thing match
- the shape of the mold roll 141 can be created using methods such as cutting, corrosion, engraving, laser processing, and electron beam processing. In the case of using a cylindrical or flat mold, it is also possible to duplicate and use an original plate prepared by these methods by a method such as transfer or electroforming.
- the material of the mold roll 141 various metals, resins, glass and the like can be used.
- metals include iron, chromium, nickel, copper, aluminum and alloys thereof.
- the outermost surface of the shape may be plated with a thickness of about several ⁇ m.
- resin or glass is used for the mold roll 141, a cylindrical or flat mold is mainly used for these.
- a plate structure 200 is provided on the surface of the mold roll 141.
- the plate structure 200 may be provided directly on the mold roll 141, or may be used by winding a cylindrical or flat mold provided with the shape. Moreover, it is also possible to use the film itself produced using these roll molds as a film plate.
- the peeling mechanism 150 has a function of peeling the molded optical element 10 from the mold roll 141.
- the plate structure 200 has a structure obtained by inverting the optical element 10 described above.
- the plate structure 200 includes a base portion 201 provided on the mold roll 141 side and a plurality of lens-shaped intaglio portions 202 provided on the base portion 201 and corresponding to the split lens 30.
- a groove 203 is formed between the plurality of lens-shaped intaglio parts 202.
- the groove portion 203 corresponds to the rib portion 40.
- the direction where the groove part 203 is extended corresponds with the direction in which the transparent base material 11 is conveyed.
- the width of the plate structure 200 is generally 0.1 to 1.5 m along the conveying direction in accordance with the width of the transparent substrate 11, but is not limited thereto.
- the transparent substrate 11 is transferred by the transfer mechanism 110.
- an uncured ultraviolet curable resin R is supplied onto the transparent substrate 11.
- the ultraviolet curable resin R is preliminarily cured by the heating unit 130.
- the transparent substrate 11 is supplied between the mold roll 141 and the pressing roll 142 of the ultraviolet curable resin transfer molding mechanism 140.
- the plate structure 200 is pressed against the ultraviolet curable resin R, and the shape is transferred by roll forming.
- the optical element 10 is peeled from the mold roll 141 by the peeling mechanism 150.
- the optical element 10 thus manufactured has the following effects in the manufacturing process. That is, according to the manufacturing apparatus 100 described above, the groove portion 203 of the plate structure 200 for forming the rib portion 40 can improve the fluidity of the material constituting the lens layer 12 when the optical element 10 is molded. it can.
- the divided lens surface 32 serves as a wall for blocking the ultraviolet curable resin R.
- the ultraviolet curable resin R is difficult to move beyond the split lens surface 32, and molding defects such as mixing of bubbles occur.
- the ultraviolet curable resin R can easily move, so that the moldability is improved and the occurrence of defects is suppressed.
- the air enters between the mold roll 141 and the transparent base material 11 for some reason, the air can be released to the outside through the groove 203.
- the groove 203 starts or ends in the middle of the split lens structure, a sufficient effect of increasing the fluidity of the ultraviolet curable resin R cannot be obtained. In other words, it is necessary to continuously provide the split lens structure from one end to the other end in such a manner that the split lens structure is divided. Further, it is preferable that the groove 203 has a constant depth in order to provide stable fluidity. Since the groove part 203 is formed as the rib part 40 in the optical element 10 having an inverted structure, the height of the rib part 40 is preferably constant.
- the optical element 10 having the rib portion 40 is manufactured by molding using the plate structure 200 having the groove portion 203 as described above, so that there are few defects and productivity can be improved. Further, by using such an optical element 10 by sticking to a printed material, a printed material having a visual effect can be manufactured at low cost.
- the molded optical element 10 has the same groove 203 as the initial plate.
- a continuous film in which the optical element 10 having the groove 203 is formed can be used as a film plate.
- FIG. 4 is a perspective view showing a main part of an optical element 10A according to a second embodiment of the present invention
- FIG. 5 is a perspective view showing a main part of an optical element 10B according to a third embodiment of the present invention. is there.
- the height of the rib portion 40 is constant, it is preferably 50% to 120% of the height of the split lens structure 20, and more preferably 80% to 110%. preferable.
- the height of the rib structure is less than 50%, the effect of improving the fluidity by the groove 203 is greatly reduced, and the occurrence of defects increases.
- it exceeds 120% the optical performance of the split lens structure 20 which is the original purpose is deteriorated, and the presence of the rib portion 40 is conspicuous even in appearance.
- the height of the rib portion 40 is in the range of 80% to 110%, there are almost no problems with fluidity and appearance, which is good.
- it can be designed at a height close to 110%, and when more emphasis is placed on the appearance, it can be designed at a height close to 80%.
- FIG. 4 is a perspective view showing a main part of the optical element 10A in which the height of the rib portion 40 is higher than the height of the split lens structure 20.
- FIG. 5 is an optical view in which the height of the rib portion 40 is lower than the height of the split lens structure 20. It is a perspective view which shows the principal part of the element 10B.
- the divided lens structure 20 is overwritten on the rib portion 40, and the divided lens structure 20 exists at a place where the height of the originally divided lens structure 20 is higher than the rib portion 40. . Thereby, both the appearance and the optical effect are closer to the state of the split lens structure 20 alone.
- FIG. 6 is a perspective view showing a main part of an optical element 10C according to a fourth embodiment of the present invention
- FIG. 7 is a perspective view showing a plate structure 200A corresponding to the optical element.
- the rib portion 40 can take various cross-sectional shapes in consideration of the balance between the fluidity and appearance of the ultraviolet curable resin R.
- a plate structure 200A as shown in FIG. 7 is used as an example in accordance with the structure of the rib portion 40, and a prism shape, a cylindrical lens shape, a rectangular shape, or a trapezoidal shape in which the top of the prism is flattened is used. be able to.
- the optimum value of the cross-sectional area of the rib portion 40 varies depending on the fluidity of the ultraviolet curable resin R.
- the height of the divided lens structure 20 is Q [ ⁇ m], 0.25 ⁇ Q 2 to 1. About 5 ⁇ Q 2 [ ⁇ m 2 ] is preferable. If the cross-sectional area is smaller than this, sufficient flow of the lens layer material for preventing molding defects cannot be obtained.
- the rib portion 40 is linear in the orthogonal direction of the linear lens, that is, in the direction orthogonal to the divided lens surface. It is preferable to provide in.
- the cylindrical lens array structure in which the divided lens surface 32 perpendicular to the surface of the transparent substrate 11 does not exist the surface perpendicular to the surface of the transparent substrate 11 passing through the boundary line between the cylindrical lenses is divided for convenience. And This is because, in such an arrangement, the effect of improving the fluidity of the ultraviolet curable resin R can be expected to the maximum while suppressing the influence on the appearance.
- a plurality of rib portions 40 can be provided at intervals.
- FIG. 8 is a plan view showing an optical element 10D according to a fifth embodiment of the present invention
- FIG. 9 is a plan view showing an optical element 10E according to a sixth embodiment of the present invention.
- the rib portion 40 is provided in a straight line passing through the center of the concentric lens. preferable. This is because when the rib portion 40 does not pass through the center, a defect occurs in the central portion of the concentric circle that is not affected by the rib portion 40.
- the effect of improving the fluidity of the ultraviolet curable resin can be expected to the maximum while suppressing the influence on the appearance.
- the rib part 40 is provided on the split lens surface perpendicular to the molding direction, which is most likely to cause molding defects.
- the rib part 40 is provided in a direction parallel to the molding direction. It is effective.
- a plurality of rib portions 40 can be provided at different angles.
- two rib portions may be provided at an angle of 90 °. It is also possible to provide four rib portions 40 at an angle of 45 °.
- FIG. 5 is a plan view showing the optical element 5 having the concentric segmented lens structure 123 of the present invention.
- the optical element 5 is provided with two orthogonal rib portions.
- a linear rib portion that passes through the center of each concentric divided lens structure is provided for each minute Fresnel lens. be able to.
- FIG. 10 is a plan view showing an optical element 10F according to a seventh embodiment of the present invention.
- the rib portion 40 and the groove portion 50 may not be linear, and a plurality of them may be spaced as necessary. It can also be provided.
- a plurality of divided lens structures 20 may be provided in a single optical element 10, and the divided lens structures 20 may be arranged so as to represent images such as pictures, characters, and numbers.
- the depth of the split lens structure 20 can be about 1 ⁇ m to 50 ⁇ m, but is not limited thereto. However, if the film thickness of the lens layer 12 is insufficient with respect to the depth of the divided lens structure 20, air bubbles are generated during molding, which causes the UV curable resin R to be inhibited from being cured and cause molding defects. The film thicknesses of the lens structure 20 and the lens layer 12 need to be set as appropriate. For this reason, the depth of the split lens structure 20 is more preferably up to about 10 ⁇ m.
- the pitch of the split lens structure 20 can be about 1 ⁇ m to 100 ⁇ m, but is not limited thereto.
- the pitch means the interval between the divided lens surfaces 32.
- the moldability of the divided lens structure 20 is affected by the aspect ratio (the value obtained by dividing the depth by the pitch) of the divided structure, and the moldability decreases as the aspect ratio increases.
- FIG. 11 is a plan view showing an optical element 10G according to the eighth embodiment of the present invention.
- the width of the rib portion 40 can be changed depending on the location.
- the rib width of the rib portion 40 near the outer periphery is narrowed in order to improve the molding rate near the outer periphery of the Fresnel lens-shaped optical element 10G.
- the fluidity along the rib of the molding resin is lowered, so that the molding resin wraps around the split lens structure 20 and the molding rate is improved.
- the molding direction can be determined in advance, it is effective to design the outlet side to be narrower with respect to the resin flow direction.
- FIG. 12 is a plan view showing an optical element 10H according to the ninth embodiment of the present invention.
- the molding rate of the optical element 10H is improved by widening the width of the rib portion 40 at a portion where the interval between the split lens structures 20 is wide with respect to the optical element 10H having an irregular structure. This is because the molding resin easily goes around the split lens structure 20 at a portion where the rib width of the rib portion 40 changes and becomes narrower.
- this invention is not limited to the said embodiment, In the implementation stage, it can change variously in the range which does not deviate from the summary. Further, the embodiments may be implemented in combination as appropriate, and in that case, the combined effect can be obtained. Furthermore, the present invention includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if several constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the problem can be solved and an effect can be obtained, the configuration from which the constituent requirements are deleted can be extracted as an invention.
- the present invention provides an optical element, an optical element plate structure, a printed matter, and an optical element suitable for manufacturing a high-quality, high-productivity product with reduced defects with respect to an optical element having a split lens structure formed on the surface. A method is obtained.
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Abstract
Description
Claims (11)
- 透明基材と、
この透明基材上に設けられ、分割レンズ面によって仕切られた複数の分割レンズを具備する分割レンズ構造を有する透明材料からなるレンズ層と、
前記複数の分割レンズ間にわたって形成され、構造高さが一定であり、かつ、前記分割レンズ構造の最も高い箇所の高さの50%~120%の高さであるリブ部と
を備えている光学素子。 - 前記分割レンズ構造は、ブレーズド構造、リニアフレネルレンズ構造、シリンドリカルレンズアレイ構造のいずれかの構造であって前記分割レンズが平行に配置される構造を含み、前記リブ部が、前記分割レンズ面に対して直交する方向に直線状に形成されている請求項1に記載の光学素子。
- 前記分割レンズ構造は、フレネルレンズ構造またはマイクロフレネルレンズアレイ構造の構造であって前記分割レンズが同心円状に配置される構造を含み、前記リブ部が、前記分割レンズの各同心円の中心を通過する直線状に形成されている請求項1に記載の光学素子。
- 前記リブ部の幅は、前記同心円の外周側において狭く形成されている請求項3に記載の光学素子。
- 透明基材と、
この透明基材上に設けられ、分割レンズ面によって仕切られた複数の分割レンズを具備するレンズ状凹版部を有する透明材料からなるレンズ層と、
前記複数の分割レンズ間にわたって形成され、構造深さが一定であり、かつ、前記レンズ状凹版部の最も低い箇所の高さの50%~120%の高さである溝部と
を備えている光学素子版構造。 - 前記レンズ状凹版部は、ブレーズド構造、リニアフレネルレンズ構造、シリンドリカルレンズアレイ構造のいずれかの構造であって前記分割レンズが平行に配置される構造を含み、前記溝部が、前記分割レンズ面に対して直交する方向に直線状に形成されている請求項5に記載の光学素子版構造。
- 前記レンズ状凹版部は、フレネルレンズ構造またはマイクロフレネルレンズアレイ構造の構造であって前記分割レンズが同心円状に配置される構造を含み、前記溝部が、前記分割レンズの各同心円の中心を通過する直線状に形成されている請求項5に記載の光学素子版構造。
- 前記溝部の幅は、前記同心円の外周側において狭く形成されている請求項7に記載の光学素子版構造。
- 請求項1~4のいずれか記載の光学素子を備えた印刷物。
- 分割面によって仕切られた複数の分割レンズを有する分割レンズ構造を含んだ光学素子の製造方法であって、
透明の基材フィルムを供給し、
この基材フィルムの前記分割レンズ構造が形成される面に透明樹脂を供給し、
前記複数の分割レンズに対応する版構造を有し、この版構造間にわたって形成され、構造深さが一定であり、かつ、前記版構造の最も低い箇所の深さの50%~120%の深さである溝部が表面に形成された型ロールに、前記基材フィルムを押しロールにより押圧し、
前記透明樹脂を硬化させ、
前記型ロールから前記基材フィルムを剥離する光学素子の製造方法。 - 前記溝部は、前記透明樹脂の流動方向に対し、その幅が狭くなるように設定されている請求項10記載の光学素子の製造方法。
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