Patent Description:
In display devices such as liquid-crystal displays and optical devices such as cameras, an incident surface of light of a substrate such as a display panel or a lens is often subjected to anti-reflection treatment in order to avoid deterioration of visibility and image quality (occurrence of color irregularities, ghosts, etc.) caused by reflection of extraneous light. This anti-reflection treatment may be performed by a conventionally known method in which a fine irregularity structure is formed at the incident surface of light so as to reduce reflectance.

Formation of a fine irregularity structure at the incident surface of light can be achieved by, for example, affixing a film having a fine irregularity structure at a surface thereof to the incident surface. This method is highly advantageous from viewpoints such as that processing of the substrate itself is not necessary, that the film itself can be distributed to market (i.e., is portable), and that a fine irregularity structure can be formed in a partial manner in a target region at the surface of the substrate.

In a situation in which a film having anti-reflection function is itself to be distributed, performing half cut processing of a film in which peelable films are stacked makes it is easy to peel off a required part when the film having anti-reflection function is to be bonded to an object serving as an adherend.

For example, Patent Literature (PTL) <NUM> discloses a pressure-sensitive adhesive film for half cut processing that includes a substrate layer and a pressure-sensitive adhesive layer. In another example, PTL <NUM> discloses half cutting a functional optical film that is stacked on a conductive metal layer. In the invention disclosed in PTL <NUM>, the functional optical film is affixed to the conductive metal layer via an adhesive.

The film disclosed in PTL <NUM> is affixed through a pressure-sensitive adhesive layer, and the film disclosed in PTL <NUM> is affixed through an adhesive. A film that is affixed via a pressure-sensitive adhesive layer, an adhesive, or the like faces issues such as environment testing durability being low and waviness readily occurring.

The present disclosure is directed to solving the various problems in the conventional art set forth above and achieving the following objects. Specifically, one object of the present disclosure is to provide a laminate that enables simple peeling of a thin film structural body having a fine irregularity structure at a surface thereof when the thin film structural body is to be bonded to an object serving as an adherend, that has improved environment testing durability, and in which waviness is inhibited. Another object of the present disclosure is to provide a method of producing this laminate. Another object of the present disclosure is to provide a method of forming an optical body having excellent anti-reflection performance on a base plate using this laminate. Another object of the present disclosure is to provide a camera module-equipped device that can acquire a captured image in which color irregularities, ghosts, and the like are inhibited.

The following are provided as a solution to the problems set forth above.

According to the present disclosure, it is possible to provide a laminate that enables simple peeling of a thin film structural body having a fine irregularity structure at a surface thereof when the thin film structural body is to be bonded to an object serving as an adherend, that has improved environment testing durability, and in which waviness is inhibited. Moreover, according to the present disclosure, it is possible to provide a method of producing this laminate. Furthermore, according to the present disclosure, it is possible to provide a method of forming an optical body having excellent anti-reflection performance on a base plate using this laminate. Also, according to the present disclosure, it is possible to provide a camera module-equipped device that can acquire a captured image in which color irregularities, ghosts, and the like are inhibited.

The following provides a detailed description of the present disclosure based on embodiments.

A presently disclosed laminate includes a thin film structural body and retention films. The thin film structural body has a first retention film stacked on one face of the thin film structural body and has a second retention film stacked on another face of the thin film structural body. The thin film structural body has a first fine irregularity structure at a face that is in contact with the first retention film and has a second fine irregularity structure at a face that is in contact with the second retention film. The first retention film has a third fine irregularity structure at a face that is in contact with the thin film structural body and the second retention film has a fourth fine irregularity structure at a face that is in contact with the thin film structural body. The laminate includes a half cut section in a thickness direction. The second retention film contains a UV-curable resin, and this UV-curable resin has a storage modulus at <NUM> of <NUM> GPa or less.

The presently disclosed laminate serves as an intermediate product used in formation of an optical body on a base plate (described further below).

The following describes a laminate according to one embodiment of the present disclosure (hereinafter, also referred to as the "laminate of the present embodiment") with reference to <FIG>, etc..

As illustrated in <FIG>, the laminate <NUM> of the present embodiment includes a thin film structural body <NUM> and two retention films (i.e., a first retention film 120a and a second retention film 120b). The first retention film 120a is stacked on one face of the thin film structural body <NUM> and the second retention film 120b is stacked on another face of the thin film structural body <NUM>. In other words, the thin film structural body <NUM> is sandwiched between the two retention films. The thin film structural body <NUM> has a first fine irregularity structure <NUM>-<NUM> at a surface where the first retention film 120a is stacked and has a second fine irregularity structure <NUM>-<NUM> at a surface where the second retention film 120b is stacked. Moreover, the first retention film 120a has a third fine irregularity structure 120a-<NUM> and the second retention film 120b has a fourth fine irregularity structure 120b-<NUM>.

The laminate <NUM> of the present embodiment also includes a half cut section <NUM> in a thickness direction. The "thickness direction" is the direction of stacking of the first retention film 120a, the thin film structural body <NUM>, and the second retention film 120b. The half cut section <NUM> is a cut line that is formed in order to make it easier for a single-side peeled laminate formed of the thin film structural body <NUM> and the first retention film 120a to be peeled from the second retention film 120b. The half cut section <NUM> completely severs the first retention film 120a and the thin film structural body <NUM> and severs up to partway through the second retention film 120b as illustrated in <FIG>.

<FIG> is a diagram of the laminate <NUM> as viewed from above. The half cut section <NUM> has a circular shape in a top view as illustrated in <FIG>. It should be noted, however, that the shape of the half cut section <NUM> in a top view is not limited to a circular shape. For example, the half cut section <NUM> may have a polygonal shape such as a quadrangular shape in a top view.

The laminate of the present embodiment satisfies P1 > P2 when peeling force at an interface of the first retention film 120a and the thin film structural body <NUM> in a <NUM>° peeling test in accordance with JIS Z0237:<NUM> is taken to be P1 (N/<NUM>) and peeling force at an interface of the second retention film 120b and the thin film structural body <NUM> in a <NUM>° peeling test in accordance with JIS Z0237:<NUM> is taken to be P2 (N/<NUM>).

As a result of the laminate <NUM> of the present embodiment including the half cut section <NUM> in the thickness direction as previously described, a single-side peeled laminate formed of the thin film structural body <NUM> and the first retention film 120a can easily be peeled from the second retention film 120b, inside of the half cut section <NUM>, when the thin film structural body <NUM> is to be bonded to an object serving as an adherend.

Moreover, as a result of the thin film structural body <NUM> being sandwiched by the two retention films with faces having fine irregularity structures (third fine irregularity structure 120a-<NUM> and fourth fine irregularity structure 120b-<NUM>) in contact therewith in the laminate <NUM> of the present embodiment as previously described, the thin film structural body <NUM> can closely adhere to the two retention films without a pressure-sensitive adhesive layer, an adhesive, or the like interposed therebetween. Through the thin film structural body <NUM> and the two retention films being closely adhered without a pressure-sensitive adhesive layer, an adhesive, or the like interposed therebetween in this manner in the laminate <NUM> of the present embodiment, the laminate <NUM> of the present embodiment has high environment testing durability and can inhibit the occurrence of waviness.

Moreover, as a result of there being a difference between one face and the other face of the thin film structural body <NUM> in terms of peeling force with the retention film stacked thereat as previously described, the laminate <NUM> of the present embodiment makes it possible to smoothly peel the retention film having low peeling force (second retention film 120b) from the thin film structural body <NUM> while maintaining a stacked state of the retention film having high peeling force (first retention film 120a) and the thin film structural body <NUM>. Furthermore, damage to a fine irregularity structure is inhibited during peeling of a retention film, and particularly during peeling of the second retention film 120b. In contrast, when peeling of either of the two retention films is attempted in a case in which peeling force with a retention film is the same at both one face and the other face of the thin film structural body <NUM>, splitting of the thin film structural body <NUM> may occur near the center thereof, the majority of a fine irregularity structure may be taken away to the retention film side, and it may not be possible to maintain sufficient quality until the thin film structural body <NUM> is actually used by a customer.

Note that peeling of the first retention film 120a can be performed smoothly by, after peeling off the second retention film 120b, bonding the thin film structural body <NUM> to a base plate or the like in advance.

In the laminate <NUM> of the present embodiment, the peeling force P1 at the interface of the first retention film 120a and the thin film structural body <NUM> and the peeling force P2 at the interface of the second retention film 120b and the thin film structural body <NUM> are each more than <NUM> N/<NUM>, preferably <NUM> N/<NUM> or more, and preferably <NUM> N/<NUM> or less. When P1 and P2 are <NUM> N/<NUM> or more, spontaneous peeling of the retention films due to external factors or the like can be inhibited. Moreover, when P1 and P2 are <NUM> N/<NUM> or less, damage to a fine irregularity structure of the thin film structural body <NUM> can be more sufficiently inhibited during peeling of a retention film.

Note that in a case in which almost the entire surface of the thin film structural body <NUM> is taken away to the retention film side during measurement of the peeling force at an interface of a retention film and the thin film structural body <NUM>, it is judged that peeling of the measurement subject was not possible and that "peel strength measurement value: more than <NUM> N/<NUM>" is not even satisfied.

In the laminate <NUM> of the present embodiment, the difference (P1 - P2) between the peeling force P1 at the interface of the first retention film 120a and the thin film structural body <NUM> and the peeling force P2 at the interface of the second retention film 120b and the thin film structural body is not specifically limited but is preferably <NUM> N/<NUM> or more, and is preferably <NUM> N/<NUM> or less. When P1 - P2 is <NUM> N/<NUM> or more, a retention film, and particularly the second retention film 120b, can be smoothly peeled from the thin film structural body <NUM> while also more effectively inhibiting damage to the thin film structural body <NUM> and a fine irregularity structure at the surface thereof. Moreover, when P1 - P2 is <NUM> N/<NUM> or less, it is possible to more effectively inhibit damage to the thin film structural body <NUM> and a fine irregularity structure at the surface thereof when the first retention film 120a is peeled from the thin film structural body.

Note that adjustment of the peeling force at an interface of a retention film and the thin film structural body <NUM> can be performed as appropriate through operations such as altering a constituent material of the thin film structural body <NUM>, altering a fine irregularity structure of the thin film structural body <NUM>, altering the thickness of a part of the thin film structural body <NUM> that is not a fine irregularity structure (described further below), adding an additive such as a fluorine-containing additive to a constituent material of a base substrate of the retention film (described further below), altering the thickness of the retention film, providing the retention film with an inorganic film, providing the retention film with a release film, and altering a constituent material or the thickness of the inorganic film or the release film. Accordingly, adjustment of P1 - P2 can be performed as appropriate through any combination of the operations described above.

The thin film structural body <NUM> used in the present embodiment has the first fine irregularity structure <NUM>-<NUM> and the second fine irregularity structure <NUM>-<NUM> at the faces thereof. In other words, fine irregularity patterns (protrusions that protrude in the thickness direction of the laminate and depressions that are depressed in the thickness direction of the laminate) are formed at both faces of the thin film structural body <NUM>. The protrusions and depressions may be arranged periodically (for example, a staggered or rectangular grid), or may be arranged randomly. Moreover, the shape of the protrusions and the depressions is not specifically limited and may be a bullet shape, a pyramidal shape, a columnar shape, a needle shape, or the like. Note that the shape of a depression is the shape formed by an inner wall of the depression.

The thin film structural body <NUM> can be produced using a UV (ultraviolet) curable resin, for example. The UV-curable resin may be a UV-curable acrylic-based resin, a UV-curable epoxy-based resin, or the like, for example, without any specific limitations.

The average period (pitch) of irregularity patterns constituting the first fine irregularity structure <NUM>-<NUM> and the second fine irregularity structure <NUM>-<NUM> is preferably equal to or less than a wavelength of visible light (for example, <NUM> or less), more preferably <NUM> or less, and even more preferably <NUM> or less, and is more preferably <NUM> or more, and even more preferably <NUM> or more. By setting the pitch of an irregularity pattern at a surface of the thin film structural body <NUM> as equal to or less than a wavelength of visible light (i.e., by providing a structure referred to as a "moth-eye structure" at the surface of the thin film structural body <NUM>), further improvement of anti-reflection performance can be achieved.

The depth of depressions (height of protrusions) of the irregularity patterns constituting the first fine irregularity structure <NUM>-<NUM> and the second fine irregularity structure <NUM>-<NUM> is not specifically limited but is preferably <NUM> or more, and more preferably <NUM> or more, and is preferably <NUM> or less, and more preferably <NUM> or less.

Note that the arrangement of depressions and protrusions, the average period of the irregularity pattern, the depth of depressions, and so forth may be the same or different for the first fine irregularity structure <NUM>-<NUM> and the second fine irregularity structure <NUM>-<NUM> of the thin film structural body <NUM>.

The thickness of the thin film structural body <NUM> used in the present embodiment is preferably <NUM> or less, more preferably <NUM> or less, and even more preferably <NUM> or less, and is preferably <NUM> or more. Such a thin film structural body <NUM> can suitably be used in an application where both improvement of anti-reflection performance and reduction of thickness are required, such as in a notebook PC, tablet PC, smartphone, mobile phone, or the like that is equipped with an image sensor.

Note that the thickness of the thin film structural body <NUM> is the distance in the stacking direction or film thickness direction between the apex of a highest protrusion formed at one face and an apex of a highest protrusion formed at the other face as indicated by T<NUM> in <FIG>.

The thickness of a part that is not a fine irregularity structure in the thin film structural body <NUM> used in the present embodiment is preferably <NUM> or less. When a laminate <NUM> including such a thin film structural body <NUM> is used in formation of an optical body by a subsequently described method of forming an optical body on a base plate according to one embodiment of the present disclosure, for example, the thin film structural body <NUM> can be more reliably peeled from a single-side peeled laminate after being bonded onto a base plate through an adhesive, and an optical body can be formed with high precision. On the other hand, the thickness of the part of the thin film structural body <NUM> that is not a fine irregularity structure can be set as <NUM> or more from a viewpoint of feasibility.

Note that the thickness of the part of the thin film structural body <NUM> that is not a fine irregularity structure is the distance in the stacking direction or film thickness direction between an apex of a deepest depression formed at one face and an apex of a deepest depression formed at the other face as indicated by T<NUM> in <FIG>.

The thin film structural body <NUM> can be produced by, for example, preparing a base substrate and two fine irregularity layers as separate members and then forming the fine irregularity layers at both faces of the base substrate. However, it is preferable that the thin film structural body <NUM> is formed of a single member from a viewpoint of avoiding deterioration of optical properties. A laminate <NUM> that includes a thin film structural body <NUM> formed of a single member in this manner can be produced by the subsequently described method of producing a laminate <NUM>, for example.

In the laminate <NUM> of the present embodiment, the two retention films (i.e., the first retention film 120a and the second retention film 120b) sandwich the thin film structural body <NUM>. These two retention films are provided for protection of the thin film structural body <NUM>, improvement of handleability, and so forth.

As illustrated in <FIG>, the first retention film 120a has a third fine irregularity structure 120a-<NUM> at a face that is in contact with the thin film structural body <NUM> and the second retention film 120b has a fourth fine irregularity structure 120b-<NUM> at a face that is in contact with the thin film structural body <NUM>. In other words, a fine irregularity pattern (protrusions that protrude in the thickness direction of the laminate <NUM> and depressions that are depressed in the thickness direction of the laminate <NUM>) is formed at a specific face of the first retention film 120a and a specific face of the second retention film 120b. This makes it simple to form fine irregularity structures at both faces of the thin film structural body <NUM>.

Moreover, as illustrated in <FIG>, the third fine irregularity structure 120a-<NUM> of the first retention film 120a is preferably an inverted structure of the first fine irregularity structure <NUM>-<NUM> of the thin film structural body <NUM>, and the fourth fine irregularity structure 120b-<NUM> of the second retention film 120b is preferably an inverted structure of the second fine irregularity structure <NUM>-<NUM> of the thin film structural body <NUM>. This makes it possible for the thin film structural body <NUM> and the retention films 120a and 120b to be mechanically joined through the respective fine irregularity structures thereof and to strengthen protection of the fine irregularity structures formed at both faces of the thin film structural body <NUM>, while also more effectively inhibiting damage to the thin film structural body <NUM> during peeling of a retention film. From the same viewpoints, it is more preferable that the fine irregularity structure of the first retention film 120a and the fine irregularity structure of the second retention film 120b interlock, without gaps, with the fine irregularity structures of the thin film structural body <NUM>. Moreover, the thin film structural body <NUM> can closely adhere to the retention films 120a and 120b through frictional force due to mechanical joining through the fine irregularity structures of both the thin film structural body <NUM> and the retention films 120a and 120b. This effect of close adherence through frictional force due to interlocking of fine irregularity structures without gaps is referred to as an "anchor effect". Through this anchor effect, it is possible to maintain a closely adhered state of the thin film structural body <NUM> with the retention films 120a and 120b even without a pressure-sensitive adhesive, an adhesive, or the like interposed therebetween.

The average period (pitch) of the irregularity patterns constituting the third fine irregularity structure 120a-<NUM> and the fourth fine irregularity structure 120b-<NUM> is preferably equal to or less than a wavelength of visible light (for example, <NUM> or less), more preferably <NUM> or less, and even more preferably <NUM> or less, and is more preferably <NUM> or more, and even more preferably <NUM> or more in the same way as for the first fine irregularity structure <NUM>-<NUM> and the second fine irregularity structure <NUM>-<NUM>.

The retention films 120a and 120b can each be produced from a base substrate, for example. Moreover, the retention films 120a and 120b that each have a fine irregularity structure at a surface thereof can be produced as illustrated in <FIG>, for example, by forming a fine irregularity layer <NUM> on a base substrate <NUM>.

Although no specific limitations are placed on the material forming the base substrate <NUM>, the material is preferably a material that is transparent and does not easily rupture, and may be PET (polyethylene terephthalate), TAC (triacetyl cellulose), or the like.

Formation of the fine irregularity layer <NUM> on the base substrate <NUM> can be achieved by, for example, implementing a method including a step of applying an uncured UV-curable resin onto one face of the base substrate <NUM>, a step of bringing a roll on which a corresponding irregularity pattern has been formed into close contact with the applied UV-curable resin and transferring an irregularity pattern to the UV-curable resin, a step of irradiating the applied UV-curable resin with UV light to cure the UV-curable resin, and a step of peeling the UV-curable resin that has been cured from the roll. Note that the UV-curable resin may be a UV-curable acrylic-based resin, a UV-curable epoxy-based resin, or the like, for example, without any specific limitations. Moreover, various additives such as curing initiators may be added to the UV-curable resin as necessary.

The method by which the laminate <NUM> of the present embodiment is produced is not specifically limited and can be selected as appropriate depending on the objective. The following describes a specific example of a method for producing the laminate <NUM> with reference to <FIG>.

The one example of a method includes a step of sandwiching a UV-curable resin between two retention films each having a fine irregularity structure at a surface thereof and performing pressure bonding thereof (sandwiching and pressure bonding step), a step of irradiating the UV-curable resin that has been sandwiched with UV light to cure the UV-curable resin (curing step), and a step of forming a half cut section <NUM> (half cut section forming step).

First, two retention films each having a fine irregularity structure at a surface thereof (first retention film 120a having third fine irregularity structure 120a-<NUM> at surface and second retention film 120b having fourth fine irregularity structure 120b-<NUM> at surface) are prepared. The first retention film 120a and the second retention film 120b are as previously described. Next, a UV-curable resin <NUM> is sandwiched between the above-described first retention film 120a and second retention film 120b such that the fine irregularity structures of the first retention film 120a and the second retention film 120b face each other as illustrated in <FIG>. Note that the UV-curable resin may be a UV-curable acrylic-based resin, a UV-curable epoxy-based resin, or the like, for example, without any specific limitations. Moreover, various additives such as curing initiators may be added to the UV-curable resin <NUM> as necessary. Furthermore, a monomer such as an ethylene oxide-based (EO-based) acrylic monomer, a propylene oxide-based (PO-based) acrylic monomer, or a fluorene-based monomer may be added to the UV-curable resin <NUM> from a viewpoint of increasing peelability and shape retainability.

The viscosity of the UV-curable resin <NUM> is preferably <NUM> cps or less. When the viscosity of the UV-curable resin <NUM> is <NUM> cps or less, it is possible to reduce the thickness of a part that is not a fine irregularity structure to <NUM> or less more easily in formation of the thin film structural body <NUM>.

As illustrated in <FIG>, the sandwiched body is pressure bonded in a sandwiching direction through a pressure bonding device such as a roll laminator <NUM>. By adjusting the pressure during pressure bonding in the sandwiching and pressure bonding step, it is possible to adjust the thickness of the obtained thin film structural body <NUM> (T<NUM> in <FIG>) and the thickness of the part of the thin film structural body <NUM> that is not a fine irregularity structure (T<NUM> in <FIG>). The thickness of the obtained thin film structural body <NUM> (T<NUM> in <FIG>) and the thickness of the part of the thin film structural body <NUM> that is not a fine irregularity structure (T<NUM> in <FIG>) can also be adjusted by adjusting the feed rate by the roll laminator.

It should be noted that although the second retention film 120b is positioned at a lower side and the first retention film 120a is positioned at an upper side relative to the roll laminator <NUM> in <FIG>, the positional relationship thereof is not specifically limited.

In the curing step, the UV-curable resin <NUM> that has been sandwiched is irradiated with UV light to cure the UV-curable resin <NUM> as illustrated in <FIG>. By curing the UV-curable resin <NUM>, a thin film structural body <NUM> having fine irregularity structures at both faces, such as illustrated in <FIG>, is formed as a single member, and a laminate <NUM> is obtained. Note that the curing step may be performed at the same timing as the sandwiching and pressure bonding step.

In the thin film structural body <NUM> that is obtained in this manner, a fine irregularity structure (first fine irregularity structure <NUM>-<NUM>) that is interlocked, without gaps, with the third fine irregularity structure 120a-<NUM> of the first retention film 120a is formed at one face of the thin film structural body <NUM>, and a fine irregularity structure (second fine irregularity structure <NUM>-<NUM>) that is interlocked, without gaps, with the fourth fine irregularity structure 120b-<NUM> of the second retention film 120b is formed at the other face of the thin film structural body <NUM>.

In the half cut section forming step, a half cut section <NUM> is formed by, in a state in which the laminate <NUM> is pressed in a direction of arrow A by an air cylinder <NUM>, punching the periphery of the pressed part using a blade <NUM> as illustrated in <FIG>. The air cylinder <NUM> keeps the laminate <NUM> in a pressed state until the blade <NUM> has been withdrawn from the laminate <NUM>. By pressing the laminate <NUM> using the air cylinder <NUM> in this manner, it is possible to prevent the first retention film 120a and the thin film structural body <NUM> being taken away by the blade <NUM> and the thin film structural body <NUM> being peeled from the second retention film 120b, inside of the half cut section <NUM>, when the blade <NUM> is withdrawn.

When a half cut section is formed by laser cutting, for example, a lot of debris is formed, but since the half cut section <NUM> is formed through punching using the blade <NUM> in the half cut section forming step according to the present disclosure, the formation of debris during formation of the half cut section <NUM> can be inhibited.

Moreover, uprising of approximately <NUM>% of film thickness at a severed part arises when a half cut section is formed by laser cutting, but by making the blade <NUM> a single-edged blade in the half cut section forming step according to the present disclosure, uprising of a severed part inside of the half cut section <NUM> can be reduced.

A presently disclosed method of forming an optical body on a base plate includes peeling the first retention film 120a and the second retention film 120b from the presently disclosed laminate <NUM> set forth above and stacking the thin film structural body <NUM> on a base plate via an adhesive. Through this method, it is possible for a thin film structural body <NUM> having fine irregularity structures at both faces to be formed, without damage, on a base plate as an optical body having excellent anti-reflection performance. In particular, through this method, it is possible to significantly inhibit damage to the fine irregularity structures during formation of the optical body even in a case in which the thin film structural body <NUM> is extremely thin (for example, <NUM> or less).

The following describes a method of forming an optical body on a base plate according to one embodiment of the present disclosure (hereinafter, also referred to as the "formation method of the present embodiment") with reference to <FIG>.

<FIG> are overviews illustrating the formation method of the present embodiment. The formation method of the present embodiment includes a first peeling step, an application step, a pressing step, a curing step, and a second peeling step.

In the first peeling step, a single-side peeled laminate formed of the thin film structural body <NUM> and the first retention film 120a is peeled from the second retention film 120b illustrated in <FIG>, inside of the half cut section <NUM>, and is placed in a state (single-side peeled laminate <NUM>') illustrated in <FIG>. As a result of P2 (peeling force at interface of second retention film 120b and thin film structural body <NUM>) being smaller than P1 (peeling force at interface of first retention film 120a and thin film structural body <NUM>), the single-side peeled laminate can be smoothly peeled from the second retention film 120b while also maintaining a stacked state of the first retention film 120a and the thin film structural body <NUM>, and inhibiting damage to the second fine irregularity structure <NUM>-<NUM>.

After the first peeling step, an adhesive <NUM> is applied onto a base plate <NUM> in the application step as illustrated in <FIG>. The adhesive <NUM> is not specifically limited and may, for example, be a composition containing a UV-curable resin such as a UV-curable acrylic-based resin or a UV-curable epoxy-based resin. The material forming the base plate <NUM> is not specifically limited and can be selected as appropriate depending on the objective of forming the optical body. For example, the material may be glass, glass that is surface coated with any organic material (for example, an epoxy acrylate copolymer), polymethyl methacrylate (PMMA), a cycloolefin copolymer (COC), a cycloolefin polymer (COP), or the like.

After the application step, the single-side peeled laminate <NUM>' is pressed against the adhesive <NUM> that has been applied onto the base plate <NUM> such that the face where the second retention film 120b has been peeled off faces toward the base plate <NUM> in the pressing step as illustrated in <FIG>. The pressed adhesive <NUM> spreads out between the base plate <NUM> and the thin film structural body <NUM>.

In the curing step illustrated in <FIG>, the pressed adhesive <NUM> is irradiated with UV light to cure the adhesive <NUM> while in a state in which pressing is maintained. The cured adhesive <NUM> strongly adheres to the base plate <NUM> and the thin film structural body <NUM>.

In the second peeling step illustrated in <FIG>, pressing of the single-side peeled laminate <NUM>' is released in order to peel the first retention film 120a from the thin film structural body <NUM>. Through the method set forth above, it is possible to form a thin film structural body <NUM> (or optical body <NUM>) in a partial manner and with high precision with respect to a target region of a base plate surface. In particular, the method set forth above is advantageous in terms that a thin film structural body <NUM> (or optical body <NUM>) can be formed in a partial manner and with high precision even with respect to a base plate to which adhesion is difficult (for example, a base plate formed of a polymer such as a cycloolefin copolymer (COC), a cycloolefin polymer (COP), or an epoxy acrylate copolymer).

In the optical body <NUM> that is formed on the base plate <NUM>, the cured adhesive <NUM>' can also enter depressions in a face at the base plate <NUM> side of the thin film structural body <NUM> as illustrated in <FIG>. In other words, the cured adhesive <NUM>' can have a fine irregularity structure at a surface at the thin film structural body <NUM> side thereof. Such an optical body <NUM> has excellent anti-reflection performance and can, for example, have an average reflectance of <NUM>% or less in a wavelength range of <NUM> to <NUM>.

A presently disclosed camera module-equipped device includes a camera module and a display panel, wherein the display panel includes an adhesive layer stacked on at least part of a surface thereof and a thin film structural body stacked on the adhesive layer. The thin film structural body has fine irregularity structures at both faces thereof. In this camera module-equipped device, the camera module is arranged such that the camera module and the thin film structural body face each other. Through this camera module-equipped device, an image sensor of the camera module can capture a still image or a video via the thin film structural body having fine irregularity structures at both faces, and thus reflection of light can be suppressed, and color irregularities, ghosts, and the like in a captured image that is acquired can be inhibited.

The camera module-equipped device may, more specifically, be a notebook PC, a tablet PC, a smartphone, a mobile phone, or the like.

The following describes a camera module-equipped device according to one embodiment of the present disclosure (hereinafter, also referred to as the "device according to the present embodiment") with reference to <FIG>.

<FIG> is a schematic overview illustrating a region in proximity to a camera module of the camera module-equipped device of the present embodiment. As illustrated in <FIG>, the camera module-equipped device <NUM> of the present embodiment includes a camera module <NUM> and a display panel <NUM>. A light shielding region <NUM> and a transparent region (non-light shielding region) <NUM> are formed at one surface of the display panel <NUM>. In the transparent region <NUM> of the display panel <NUM>, an adhesive layer <NUM> is stacked and, in addition thereto, a thin film structural body <NUM> is stacked on the adhesive layer <NUM>.

The display panel <NUM> is preferably transparent in order that it can be used as a liquid-crystal display, a touch panel, or the like. For example, the display panel <NUM> may be formed of glass, glass that is surface coated with any organic material, polymethyl methacrylate (PMMA), or the like. The thin film structural body <NUM> is as previously described for the thin film structural body <NUM> included in the presently disclosed laminate <NUM> set forth above.

The adhesive layer <NUM> and the thin film structural body <NUM> can be formed on the display panel <NUM>, serving as a base plate, by the presently disclosed method of forming an optical body on a base plate set forth above, and using the presently disclosed laminate <NUM> set forth above. In such a situation, the adhesive layer <NUM> and the thin film structural body <NUM> respectively correspond to the cured adhesive <NUM>' and the thin film structural body <NUM> described for the formation method of the present embodiment.

The camera module <NUM> is arranged such that the camera module <NUM> and the thin film structural body <NUM> face each other as illustrated in <FIG>.

No specific limitations are placed on detailed conditions of the device of the present embodiment, such as the specific configuration of the camera module <NUM>, the distance between the camera module <NUM> and the thin film structural body <NUM>, and so forth.

The following provides a more specific description of the present disclosure through examples and comparative examples.

Note that testing of detachment upon punching and testing of detachment after vibration were performed by the following procedures for laminates produced in the examples and comparative examples. In addition, half cut processing was evaluated based on the results of testing of detachment upon punching and testing of detachment after vibration.

Half cut sections <NUM> were formed at <NUM> locations in <NUM> rows by <NUM> columns in a laminate <NUM> as illustrated in <FIG>. When each of these half cut sections <NUM> was formed, it was confirmed whether or not a single-side peeled laminate inside of the half cut section <NUM> became detached.

In testing of detachment upon punching, the outer dimensions of the laminate <NUM> were set as <NUM> in length by <NUM> in width. Moreover, the interval between centers of adjacent half cut sections <NUM> was set as <NUM>.

Conditions of a pressing machine, air cylinder <NUM>, and blade <NUM> in formation of the half cut sections <NUM> were set as indicated below.

Testing of detachment after vibration was performed for laminates <NUM> for which detachment of a single-side peeled laminate inside of a half cut section <NUM> did not occur in testing of detachment upon punching. In the testing of detachment after vibration, the laminate <NUM> was subjected to vibration anticipated to occur during transportation thereof, and it was confirmed whether or not a single-side peeled laminate inside of the half cut section <NUM> became detached.

The testing of detachment after vibration was performed by subjecting a laminate <NUM> packaged in corrugated cardboard or the like to vibration under the following conditions.

Half cut processing was evaluated by the following standard based on the results of testing of detachment upon punching and testing of detachment after vibration.

As indicated above, a laminate <NUM> for which detachment did not occur in testing of detachment upon punching but did occur in testing of detachment after vibration was given a B evaluation rather than a C evaluation because such a laminate <NUM> can be transported without detachment by transporting the laminate <NUM> under transportation conditions with little vibration.

The following material was used as the base substrate of a retention film in a laminate for which testing of detachment upon punching and testing of detachment after vibration were performed. Note that the following material has four thicknesses (<NUM>, <NUM>, <NUM>, and <NUM>), and thus a film of one or other of these thicknesses was used.

Moreover, one or other of the three types of resins shown below was used as a fine irregularity layer of the retention film (i.e., a UV-curable resin contained in the retention film). Note that the following resins <NUM> to <NUM> are resins that differ in terms of storage modulus at <NUM>. Resin <NUM> has a storage modulus at <NUM> of <NUM> GPa, resin <NUM> has a storage modulus at <NUM> of <NUM> GPa, and resin <NUM> has a storage modulus at <NUM> of <NUM> MPa.

Testing of detachment upon punching and testing of detachment after vibration were performed with the thickness of a base substrate <NUM> of a first retention film 120a set as the four values indicated below.

In this testing, the thickness of a base substrate <NUM> of a second retention film 120b, the storage modulus of a fine irregularity layer <NUM> of the second retention film 120b, and the storage modulus of a fine irregularity layer <NUM> of the first retention film 120a were set as follows as conditions that were common for each example.

Results for the dependence on thickness of the base substrate of the first retention film performed for Examples <NUM> to <NUM> and Comparative Example <NUM>, described above, are shown below in Table <NUM>.

In "Detachment upon punching" or "Detachment after vibration" of Table <NUM>, "OK" indicates that detachment did not occur, whereas "Poor" indicates that detachment did occur.

As shown in Table <NUM>, detachment did not occur in testing of detachment upon punching or in testing of detachment after vibration in Examples <NUM> to <NUM>. Accordingly, a good result (A evaluation) was given in evaluation of half cut processing. This is thought to be due to the base substrate <NUM> of the first retention film 120a having sufficient flexibility as a result of being thin, and due to deformation of the first retention film 120a during punching being small. It is also thought that as a result of deformation of the first retention film 120a being small, close adherence through an anchor effect between the thin film structural body <NUM> and the second retention film 120b was maintained, and, consequently, detachment did not occur even in testing of detachment after vibration.

On the other hand, although detachment did not occur in testing of detachment upon punching in Comparative Example <NUM>, detachment did occur in testing of detachment after vibration. Accordingly, a B evaluation was given in evaluation of half cut processing. This is thought to be due to the base substrate <NUM> of the first retention film 120a having insufficient flexibility as a result of being thick, and due to deformation of the first retention film 120a during punching being large. It is also thought that upon punching, the thin film structural body <NUM> was peeled from the second retention film 120b to a degree that did not cause detachment, and the anchor effect between the thin film structural body <NUM> and the second retention film 120b was lost due to deformation of the first retention film 120a being large, and thus detachment did occur in testing of detachment after vibration.

Testing of detachment upon punching and testing of detachment after vibration were performed with the storage modulus of a fine irregularity layer <NUM> of a second retention film 120b set as the following three values.

In this testing, the thickness of a base substrate <NUM> of the second retention film 120b, the thickness of a base substrate <NUM> of a first retention film 120a, and the storage modulus of a fine irregularity layer <NUM> of the first retention film 120a were set as follows as conditions that were common for each example.

Results for the dependence on the storage modulus of the fine irregularity layer of the second retention film performed for Example <NUM>, Example <NUM>, and Comparative Example <NUM>, described above, are shown below in Table <NUM>.

<FIG> illustrates the appearance of a laminate <NUM> according to Comparative Example <NUM> after testing of detachment upon punching. In the laminate <NUM> according to Comparative Example <NUM>, detachment occurred for all of the half cut sections <NUM> at the <NUM> locations in <NUM> rows by <NUM> columns as illustrated in <FIG> illustrates the appearance of a laminate <NUM> according to Example <NUM> after testing of detachment upon punching. In the laminate <NUM> according to Example <NUM>, detachment did not occur for any of the half cut sections <NUM> at the <NUM> locations in <NUM> rows by <NUM> columns as illustrated in <FIG>.

In "Detachment upon punching" or "Detachment after vibration" of Table <NUM>, "OK" indicates that detachment did not occur, whereas "Poor" indicates that detachment did occur. Moreover, "N/A" for "Detachment after vibration" indicates that detachment occurred in testing of detachment upon punching, and thus testing of detachment after vibration was not subsequently performed.

As shown in Table <NUM>, detachment did not occur in testing of detachment upon punching or testing of detachment after vibration in Example <NUM> and Example <NUM>. Accordingly, a good result (A evaluation) was given in evaluation of half cut processing. On the other hand, detachment occurred in testing of detachment upon punching in Comparative Example <NUM>. Accordingly, a C evaluation was given in evaluation of half cut processing. Based on the results shown in Table <NUM>, it is thought that a good evaluation of half cut processing is achieved when the storage modulus of the fine irregularity layer <NUM> of the second retention film 120b is <NUM> GPa or less.

Through evaluation of "Dependence on thickness of base substrate of first retention film" and "Dependence on storage modulus of second retention film" described above, it was possible to discover suitable conditions for forming the half cut section <NUM> in the laminate <NUM>. Specifically, the thickness of the base substrate <NUM> of the first retention film 120a is preferably <NUM> or less. Moreover, the storage modulus at <NUM> of the fine irregularity layer <NUM> of the second retention film 120b is preferably <NUM> GPa or less.

Claim 1:
A laminate (<NUM>) comprising a thin film structural body (<NUM>) and retention films (120a, 120b), wherein
a first retention film (120a) is stacked on one face of the thin film structural body (<NUM>) and a second retention film (120b) is stacked on another face of the thin film structural body (<NUM>),
the thin film structural body (<NUM>) has a first fine irregularity structure (<NUM>-<NUM>) at a face that is in contact with the first retention film (120a) and has a second fine irregularity structure (<NUM>-<NUM>) at a face that is in contact with the second retention film (120b),
the first retention film (120a) has a third fine irregularity structure (120a-<NUM>) at a face that is in contact with the thin film structural body (<NUM>),
the second retention film (120b) has a fourth fine irregularity structure (120b-<NUM>) at a face that is in contact with the thin film structural body (<NUM>),
the laminate (<NUM>) includes a half cut section (<NUM>) in a thickness direction,
the half cut section (<NUM>) completely severs the first retention film (120a) and the thin film structural body (<NUM>) and severs up to partway through the second retention film (120b), and
the second retention film (120b) contains a UV-curable resin, and the second retention film (120b) has a storage modulus at <NUM> of <NUM> GPa or less.