face shield

Abstract

To provide a face shield capable of suppressing interference between the spectacles and the holding member thereof and making the holding member inconspicuous even when the wearer wears the spectacles.SOLUTION: A face shield 10 includes a holding member 20 worn by a wearer H, and a transparent laminate film 30 attached to the holding member 20 and covering at least a portion of the face F of the wearer H. The holding member 20 has a pair of temple portions 21 including an ear hook portion 22 worn on the ear E, and a connecting portion 23 connecting the pair of temple portions 21 to each other from behind the wearer H. In front of the wearer H, no other member extending between the pair of temple portions 21 is arranged.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to face shields. [Background technology]

[0002] Face shields that prevent droplets of saliva and the like caused by sneezing or coughing from adhering to the face of an opposing person have been known (see, for example, Patent Document 1). Patent Document 1 discloses a face shield that is made up of a shield portion that is placed in front of the wearer's face and a frame that holds the shield portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Registered Utility Model No. 3227450 Summary of the Invention [Problem to be solved by the invention]

[0004] However, if the wearer of a face shield also wears glasses, the glasses may interfere with the frame of the face shield. Also, if the frame includes a member that crosses in front of the wearer, the frame may be too conspicuous and may cause discomfort to others who see the wearer.

[0005] The present disclosure has been made in consideration of these points, and aims to provide a face shield that can prevent interference between the eyeglasses and the holding member, even when the wearer is wearing eyeglasses, and can also prevent the holding member from being noticeable. [Means for solving the problem]

[0006] A face shield according to one embodiment is a face shield that protects the face of a wearer, and comprises a retaining member that is worn by the wearer, and a transparent laminate film that is attached to the retaining member and covers at least a portion of the wearer's face, wherein the retaining member has a pair of temple portions that include ear hooks that are worn on the wearer's ears, and a connecting portion that connects the pair of temple portions to each other from behind the wearer, and no other members extending between the pair of temple portions are positioned in front of the wearer.

[0007] In one embodiment of the face shield, the pair of temple portions may extend parallel to each other forward of the ear hook portion, or may extend such that the distance between the pair of temple portions increases as they extend forward.

[0008] In one embodiment of the face shield, it is preferable that the force required to spread the temple portions apart from each other so that the distance between the tips of the temple portions is 130 mm is greater than or equal to 0.01 N and less than or equal to 3.0 N.

[0009] In the face shield according to one embodiment, a weight for adjusting the inclination of the temple portion relative to the horizontal direction may be attached to the connecting portion.

[0010] In the face shield according to one embodiment, the temple portions and the connecting portion may be integrally molded.

[0011] In the face shield according to one embodiment, the connecting portion may be provided separately from the temple portion, and may adjust the inclination of the temple portion relative to the horizontal direction.

[0012] In the face shield according to one embodiment, the holding member may be made of a rod-shaped member made of metal.

[0013] In one embodiment of the face shield, the metal may be aluminum.

[0014] In the face shield according to one embodiment, the holding member may be a rod-shaped member made of resin.

[0015] In the face shield according to one embodiment, the resin may be made of a resin selected from polyethylene terephthalate, polycarbonate, and acrylic resin.

[0016] In one embodiment of a face shield, the temple portion is provided in front of the ear hook portion and includes a pair of attachment portions for holding the transparent laminate film, and the transparent laminate film may have openings formed therein through which the attachment portions are inserted.

[0017] In the face shield according to one embodiment, the holding member may hold the transparent laminate film so that the transparent laminate film is movable in the up and down direction. [Effects of the Invention]

[0018] According to the present disclosure, even when the wearer is wearing eyeglasses, it is possible to prevent interference between the eyeglasses and the holding member, and also to prevent the holding member from being conspicuous. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing a face shield according to a first embodiment. [Figure 2] FIG. 2 is a front view showing the face shield according to the first embodiment. [Figure 3] FIG. 3 is a perspective view showing a holding member of the face shield according to the first embodiment. [Figure 3A] FIG. 3A is a plan view showing a holding member of the face shield according to the first embodiment. [Figure 3B]FIG. 3B is a plan view showing another example of the holding member of the face shield according to the first embodiment. [Figure 4] FIG. 4 is a front view showing the transparent laminate film according to the first embodiment in an assembled state. [Figure 5] FIG. 5 is a bottom view showing the transparent laminate film according to the first embodiment in an assembled state. [Figure 6] FIG. 6 is a plan view showing the transparent laminate film according to the first embodiment in an assembled state. [Figure 7] FIG. 7 is a side view showing the transparent laminate film according to the first embodiment in an assembled state. [Figure 8] FIG. 8 is a development view showing the transparent laminate film according to the first embodiment. [Figure 9A] FIG. 9A is a cross-sectional view showing an example of a layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 9B] FIG. 9B is a cross-sectional view showing an example of a layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 9C] FIG. 9C is a cross-sectional view showing an example of a layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 9D] FIG. 9D is a cross-sectional view showing an example of a layer structure of the protective film-attached transparent laminate film according to the first embodiment. [Figure 10] FIG. 10 is a perspective view showing a modified example of the holding member of the face shield according to the first embodiment. [Figure 11] FIG. 11 is a front view showing a connecting portion of a modified example of the holding member of the face shield according to the first embodiment. [Figure 12] FIG. 12 is a perspective view showing a face shield according to the second embodiment. [Figure 13] FIG. 13 is a front view showing a face shield according to the second embodiment. [Figure 14] FIG. 14 is a bottom view showing the transparent lamination film according to the second embodiment in an assembled state. [Figure 15] FIG. 15 is a plan view showing the transparent laminate film according to the second embodiment in an assembled state. [Figure 16] FIG. 16 is a side view showing the transparent laminate film according to the second embodiment in an assembled state. [Figure 17] FIG. 17 is a development view showing the transparent laminate film according to the second embodiment. [Figure 18] FIG. 18 is a perspective view showing a face shield according to the third embodiment. [Figure 19] FIG. 19 is a front view showing a face shield according to the third embodiment. [Figure 20] FIG. 20 is a bottom view showing the transparent lamination film according to the third embodiment in an assembled state. [Figure 21] FIG. 21 is a plan view showing the transparent laminate film according to the third embodiment in an assembled state. [Figure 22] FIG. 22 is a side view showing the transparent laminate film according to the third embodiment in an assembled state. [Figure 23] FIG. 23 is a development view showing the transparent laminate film according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] < First embodiment > The first embodiment will be described below with reference to the drawings. FIGS. 1 to 9D are diagrams illustrating the first embodiment. The following figures are schematic diagrams. Therefore, the size and shape of each part are appropriately exaggerated for ease of understanding. Furthermore, appropriate modifications can be made without departing from the technical concept. In the following figures, identical parts are denoted by the same reference numerals, and some detailed descriptions may be omitted. Furthermore, the numerical values, such as dimensions, and material names of each component described in this specification are examples of an embodiment and are not limited to these and may be selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are interpreted not only strictly but also to include substantially the same state.

[0021] face shield First, a face shield 10 will be described with reference to Fig. 1. This face shield 10 serves to protect the face F of a wearer H. As shown in Fig. 1, the face shield 10 includes a holding member 20 that is worn by the wearer H, and a shield part 30A (transparent laminate film 30) that is attached to the holding member 20 and covers at least a portion of the face F of the wearer H.

[0022] (holding member) The retaining member 20 is a member that holds the shield portion 30A so that a desired gap is formed between the nose N, mouth, etc. of the wearer H and the shield portion 30A when the wearer H wears the face shield 10. As shown in Figures 1 to 3, the retaining member 20 has a pair of temple portions 21 each including an ear hook portion 22 that is attached to the ear E of the wearer H, and a connecting portion 23 (see Figures 1 and 3) that connects the pair of temple portions 21 to each other from behind the wearer H.

[0023] Of these, the ear hook portions 22 of the temple portions 21 extend in a generally arc shape. The ear hook portions 22 come into contact with the wearer's ears E from above, allowing the face shield 10 to be worn by the wearer H. In this embodiment, only the ear hook portions 22 of the face shield 10 may come into contact with the wearer H.

[0024] 1 to 3, the temple portion 21 of the holding member 20 is provided in front of the ear hook portion 22 and includes a pair of attachment portions 25 for holding the shield portion 30A. The attachment portions 25 are adapted to be inserted into openings 80 (described later) formed in the transparent laminate film 30.

[0025] In the present embodiment, the attachment portion 25 may be formed by bending the tip of a rod-shaped member, which will be described later. This attachment portion 25 includes a first protrusion 26 and a second protrusion 27 located forward of the first protrusion 26. The first protrusion 26 is formed by the tip of a rod-shaped member and protrudes horizontally toward a side away from the face F of the wearer H. This makes it possible to prevent the first protrusion 26 from coming into contact with the face F of the wearer H. As described above, the first protrusion 26 is formed by the tip of a rod-shaped member, and the height of the first protrusion 26 is equal to the diameter of the rod-shaped member.

[0026] The second protruding portion 27 is formed by folding a rod-shaped member, and protrudes horizontally toward the side away from the face F of the wearer H. This makes it possible to prevent the second protruding portion 27 from coming into contact with the face F of the wearer H. As described above, the second protruding portion 27 is formed by folding a rod-shaped member, and the height of the second protruding portion 27 is at least twice the diameter of the rod-shaped member.

[0027] The holding member 20 holds the shield part 30A so that it can move in the up and down direction. In this case, there is a play between the first protrusion 26 and a first opening 81 (described later), and there is a play between the second protrusion 27 and a second opening 82 (described later). As a result, even if the shield part 30A comes into contact with a surrounding structure, the shield part 30A moves relative to the holding member 20, preventing the wearer H from receiving an impact from the face shield 10 and preventing the face shield 10 from coming off the wearer H. Note that the play between the second protrusion 27 and a second opening 82 (described later) may be larger than the play between the first protrusion 26 and a first opening 81 (described later). Also, there may be almost no play between the first protrusion 26 and a first opening 81 (described later). Even in this case, the shield part 30A can move in the up and down direction so as to rotate about the central axis of the first protrusion 26.

[0028] Furthermore, weights 24 that adjust the inclination of temple portions 21 relative to the horizontal direction are attached to connecting portions 23. This prevents shield portion 30A from coming into contact with face F of wearer H. As will be described later, retaining member 20 according to this embodiment is made of a metal rod-shaped member, and as described above, retaining member 20 according to this embodiment is configured so that only ear hook portions 22 can come into contact with wearer H. Even with retaining member 20 having such a simple configuration, weights 24 that adjust the inclination of temple portions 21 relative to the horizontal direction are attached to connecting portions 23, so that shield portion 30A can be prevented from coming into contact with face F of wearer H. Therefore, face shield 10 with desired performance can be manufactured at low cost.

[0029] In this embodiment, the temple portions 21 and the connecting portion 23 are integrally molded. The holding member 20 is made of a rod-shaped member made of metal. This makes it possible to prevent the holding member 20 from being damaged even if the face shield 10 is dropped. In the illustrated example, the rod-shaped member is made of a round bar. The diameter of this round bar may be, for example, approximately 1 mm or more and 5 mm or less, and is preferably 2 mm or more and 3 mm or less. By making the diameter of the round bar 2 mm or more, it is possible to prevent a decrease in the strength of the holding member 20. Furthermore, by making the diameter of the round bar 3 mm or less, it is possible to reduce the weight of the holding member 20.

[0030] Furthermore, the metal constituting the rod-shaped member is preferably aluminum. This allows the holding member 20 to be easily molded. Furthermore, the weight of the holding member 20 can be reduced. The metal may also be stainless steel or titanium. The holding member 20 may be made of a rod-shaped member made of resin. This allows the weight of the holding member 20 to be further reduced. Furthermore, since the holding member 20 is made of resin, it is possible to prevent the holding member 20 from forming a crease when the holding member 20 is bent. In this case, the resin material used for the holding member 20 can be selected from commonly used resin materials. For example, the resin may be made of a resin selected from polyethylene terephthalate, polycarbonate, and acrylic resin.

[0031] Here, no other members extending between the pair of temple portions 21 are arranged in front of the wearer H. This makes it possible to prevent interference between the eyeglasses and the holding member 20 when the wearer H is wearing eyeglasses. Furthermore, because no other members extending between the pair of temple portions 21 are arranged in front of the wearer H, it is possible to prevent the holding member 20 from being conspicuous.

[0032] Furthermore, when the face shield 10 is attached to a mannequin (a face mannequin manufactured by Daiso Industries Co., Ltd.), the ratio (A2 / A1) of the area A2 of the holding member 20 to the area A1 of the mannequin's face in a front view is preferably 0.1% or more and 5% or less. Here, in order to hold the shield portion 30A in front of the wearer H, when the face shield 10 is attached to the mannequin, it is preferable that the tip of the holding member 20 is not hidden by the mannequin in a front view, and that the tip of the holding member 20 is visible. In this case, in order to be able to hold the shield portion 30A in front of the wearer H, this ratio can be 0.1% or more. Furthermore, by having this ratio be 5% or less, the holding member 20 can be made less noticeable when the wearer H wears the face shield 10. Here, in this embodiment, "viewed from the front" means that the face shield 10 is viewed from the normal direction of a third curved surface 77c (see Figure 2) of the shield part 30A (transparent laminate film 30) described later, in a state where the wearer H is wearing the face shield 10 so that the portion of the pair of temple parts 21 that is located forward of the ear hook parts 22 is horizontal, and the second protrusion part 27 is abutting the upper end of the second opening 82 described later (the state shown in Figure 2).

[0033] 3A, the pair of temple portions 21 may extend parallel to each other in front of the ear hooks 22. This prevents the portions of the pair of temple portions 21 located in front of the ear hooks 22 from coming into contact with the head (for example, the temples) of the wearer H. This prevents the head of the wearer H from being tightly gripped by the pair of temple portions 21. As a result, the wearer H is prevented from feeling uncomfortable, and the wearer H can wear the face shield 10 without feeling any stress. Furthermore, as shown in FIG. 3B, the pair of temple portions 21 may extend in front of the ear hooks 22 such that the distance between the pair of temple portions 21 increases toward the front. In this case as well, it is possible to prevent the portions of the pair of temple portions 21 located in front of the ear hooks 22 from coming into contact with the head (for example, the temples) of the wearer H.

[0034] Furthermore, the force required to spread the temple portions 21 apart from each other so that the distance between the tips of the temple portions 21 is 130 mm is preferably 0.01 N or more and 3.0 N or less. This prevents the wearer H's head from being pinched by the pair of temple portions 21. As a result, discomfort felt by the wearer H can be prevented, and the wearer H can wear the face shield 10 without feeling any stress. In this case, the force can be measured using a tensile tester (MCT-2150 (product name) manufactured by A&D Co., Ltd.).

[0035] The weight of such a holding member 20 is preferably 20 g or less, which allows the wearer H to wear the face shield 10 without feeling any stress.

[0036] (Shield part) Next, the shield part 30A will be described. The shield part 30A plays a role in preventing droplets of saliva, etc. caused by sneezing or coughing by the wearer H from adhering to the face of another person, and preventing droplets of saliva, etc. caused by sneezing or coughing by another person from adhering to the face F of the wearer H. This shield part 30A is made of a transparent laminate film 30. In this embodiment, the shield part 30A covers the entire face F of the wearer H. It is to be noted that the shield part 30A may cover only a part of the face F of the wearer H.

[0037] As shown in Figures 4 to 8, the transparent laminate film 30 constituting the shield portion 30A has a rectangular shape (see Figure 8) having an upper edge 71, a lower edge 72 opposite the upper edge 71, and a pair of side edges 73 extending between the upper edge 71 and the lower edge 72.

[0038] Among these, a plurality of first cutouts 74a are formed on the lower side 72. In this embodiment, three first cutouts 74a are formed, and each first cutout 74a is formed by cutting the transparent laminate film 30 in a V-shape. Furthermore, a through-hole 78a penetrating the transparent laminate film 30 in the thickness direction is formed at the tip of the V-shape. This makes it possible to prevent the transparent laminate film 30 from breaking due to the first cutout 74a. The shape of the first cutout 74a is arbitrary; for example, the first cutout 74a may be formed by cutting the transparent laminate film 30 in a linear manner.

[0039] Furthermore, a first engagement portion 75a is formed on one side (the right side in FIG. 8) of the first cutout portion 74a, and a first locking portion 76a that locks the first engagement portion 75a is formed on the other side (the left side in FIG. 8) of the first cutout portion 74a. Of these, the first engagement portion 75a is formed on one side of each first cutout portion 74a, and in this embodiment, three first engagement portions 75a are formed. In the example shown in the figure, each first engagement portion 75a is formed by a protruding piece that is provided to protrude from the lower side 72 toward the upper side 71.

[0040] The first locking portions 76a are formed on the other side of each first cutout portion 74a, and in this embodiment, three first locking portions 76a are formed. In the example shown, each first locking portion 76a is formed by a through-hole that penetrates the transparent laminate film 30 in the thickness direction, and the through-holes that make up the first locking portions 76a are each rectangular. However, this is not limited thereto, and the through-holes that make up the first locking portions 76a may have any shape, such as a circle, an ellipse, or a polygon with rounded corners.

[0041] Then, by engaging the first engagement portion 75a with the first locking portion 76a, a first curved surface 77a (see FIGS. 4, 5, and 7) that curves convexly toward the side away from the wearer H is formed near the bottom edge 72. As a result, droplets that splash downward adhere to the first curved surface 77a. This makes it possible to prevent droplets from falling below the face shield 10. As a result, it is possible to prevent droplets that splash downward from adhering to surrounding structures.

[0042] Furthermore, because the first curved surface 77a is curved so as to be convex on the side away from the wearer H, the area where the first curved surface 77a is formed is prone to elastic deformation when an impact is applied to that area. Therefore, even if the face shield 10 is dropped, the area where the first curved surface 77a is formed elastically deforms, allowing that area to absorb the impact of the fall. This makes it possible to prevent damage to the face shield 10.

[0043] This first curved surface 77a may be a three-dimensional curved surface. In this specification, the term "three-dimensional curved surface" refers to a surface that is partially or entirely curved around each of a plurality of non-parallel axes. For example, the first curved surface 77a may be entirely curved so that its vertical cross-sectional shape at any position is convex on the side away from the wearer H, or may be curved so that its horizontal cross-sectional shape at any position is convex on the side away from the wearer H.

[0044] In this embodiment, a plurality of second cutouts 74b are formed on the upper side 71. In this embodiment, three second cutouts 74b are formed, and each second cutout 74b is formed by cutting the transparent laminate film 30 in a V-shape. A through-hole 78b is formed at the tip of the V-shape. This prevents the transparent laminate film 30 from breaking due to the second cutout 74b. The shape of the second cutout 74b is arbitrary; for example, the second cutout 74b may be formed by cutting the transparent laminate film 30 in a linear shape.

[0045] Further, second engagement portions 75b are formed on one side (the left side in FIG. 8) of the second cutout portions 74b, and second locking portions 76b that lock the second engagement portions 75b are formed on the other side (the right side in FIG. 8) of the second cutout portions 74b. Of these, the second engagement portions 75b are formed on one side of each second cutout portion 74b, and in this embodiment, three second engagement portions 75b are formed. In the example shown in the figure, each second engagement portion 75b is formed by a protruding piece that is provided to protrude from the upper side 71 toward the lower side 72.

[0046] The second locking portions 76b are formed on the other side of each second cutout portion 74b, and in this embodiment, three second locking portions 76b are formed. In the example shown, each second locking portion 76b is formed by a through-hole that penetrates the transparent laminate film 30 in the thickness direction, and the through-holes that make up the second locking portions 76b are each rectangular. However, this is not limited thereto, and the through-holes that make up the second locking portions 76b may have any shape, such as a circle, an ellipse, or a polygon with rounded corners.

[0047] Then, by engaging the second engaging portion 75b with the second locking portion 76b, a second curved surface 77b (see FIGS. 4, 6, and 7) that curves convexly away from the wearer H is formed near the upper edge 71. As a result, droplets that splash upward adhere to the second curved surface 77b. This makes it possible to prevent droplets from splashing from above the face shield 10 to the surrounding area. As a result, it is possible to prevent splashed droplets from adhering to surrounding structures. Furthermore, by forming the second curved surface 77b near the upper edge 71, the head of the wearer H can also be covered by the second curved surface 77b, making it possible to effectively protect the wearer H from splashes that splash from outside.

[0048] The second curved surface 77b may be a three-dimensional curved surface. For example, the second curved surface 77b may be curved overall so that its vertical cross-sectional shape is convex on the side away from the wearer H at any position, or may be curved so that its horizontal cross-sectional shape is convex on the side away from the wearer H at any position.

[0049] Furthermore, by engaging the first engaging portion 75a with the first locking portion 76a and the second engaging portion 75b with the second locking portion 76b, a third curved surface 77c that curves convexly away from the wearer H is formed between the first curved surface 77a and the second curved surface 77b. As a result, droplets that are scattered in the direction facing the wearer and in the left and right directions as seen from the wearer adhere to the third curved surface 77c. This prevents droplets from scattering from the sides of the face shield 10 to the surrounding area. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures.

[0050] As shown in Fig. 7, the third curved surface 77c has a linear shape in vertical cross section. This prevents the size of the face shield 10 (particularly the size in the front-to-back direction) from becoming too large. This prevents the transparent laminate film 30 constituting the shield portion 30A from coming into contact with surrounding structures or other people when the wearer H moves their head, for example. Furthermore, because the size of the face shield 10 can be prevented from becoming too large, the wearer H can concentrate on their work without feeling stressed even when wearing the face shield 10.

[0051] The third curved surface 77c may be a two-dimensional curved surface. In this specification, the term "two-dimensional curved surface" refers to a curved surface that is two-dimensionally curved about a single axis, or a curved surface that is two-dimensionally curved with the same or different curvatures about multiple parallel axes. For example, the third curved surface 77c may have a linear vertical cross-sectional shape at any position, or may have a horizontal cross-sectional shape that is curved so as to be convex toward the side away from the wearer H at any position.

[0052] 4, 7, and 8, openings 80 into which the attachment parts 25 are inserted are formed in the transparent laminate film 30. In this case, the openings 80 are formed near the pair of side edges 73, respectively.

[0053] Each opening 80 includes a first opening 81 into which the first protrusion 26 is inserted and a second opening 82 into which the second protrusion 27 is inserted. In the example shown, each opening 80 includes two first openings 81 and two second openings 82. In this case, for example, by changing the first opening 81 into which the first protrusion 26 is inserted, the curvatures of the first curved surface 77a, the second curved surface 77b, and the third curved surface 77c of the shield part 30A can be easily changed.

[0054] Each of the first openings 81 penetrates the transparent laminate film 30 in the thickness direction. Each of the first openings 81 has a shape corresponding to the first protrusion 26. In this embodiment, the first openings 81 have a circular shape with a diameter slightly larger than the diameter of the rod-shaped member that constitutes the first protrusion 26.

[0055] Each second opening 82 penetrates the transparent laminate film 30 in the thickness direction. Each second opening 82 has a rectangular shape extending in the up-down direction. In this embodiment, the height of the second opening 82 is greater than the height of the second protrusion 27, and as described above, a gap is provided between the second protrusion 27 and the second opening 82. In the illustrated example, the shapes of the second openings 82 in one opening 80 are different from each other. That is, in one opening 80, the height of one second opening 82 is greater than the height of the other second opening 82. However, this is not limited to this, and the shapes of the second openings 82 in one opening 80 may be the same.

[0056] The opening 80 is formed in the area where the third curved surface 77c is formed. As described above, the third curved surface 77c is curved so as to be convex on the side away from the wearer H. Therefore, by inserting the pair of attachment portions 25 into the opening 80 from the rear surface (the surface on the wearer H side) of the transparent laminate film 30, the holding member 20 can easily hold the transparent laminate film 30.

[0057] Transparent laminated film with protective film Next, a description will be given of the transparent laminate film 60 with a protective film. Figures 9A to 9D show an example of the layer structure of the transparent laminate film 60 with a protective film. As shown in Figures 9A to 9D, the transparent laminate film 60 with a protective film includes the transparent laminate film 30 according to this embodiment, a surface protective film 61 that protects the surface 301 of the transparent laminate film 30, and a back surface protective film 62 that protects the back surface 302 of the transparent laminate film 30.

[0058] The surface protective film 61 and the back protective film 62 serve to prevent scratches on the front surface 301 and the back surface 302 of the transparent laminate film 30, respectively, and to prevent contamination of the front surface 301 and the back surface 302 with foreign matter, etc. The surface protective film 61 and the back surface protective film 62 are each detachably attached to the transparent laminate film 30. The surface protective film 61 and the back surface protective film 62 may each include a bonding layer (not shown) and be attached to the transparent laminate film 30 by this bonding layer. The adhesive strength of the bonding layer may be, for example, approximately 0.05 N / 25 mm or more and 5 N / 25 mm or less. When using the face shield 10 described above, the surface protective film 61 and the back surface protective film 62 are each peeled off from the transparent laminate film 30. The material of the surface protective film 61 and the back surface protective film 62 may be, for example, a film made of polyester resin or a polyolefin such as polyethylene or polypropylene.

[0059] Transparent Laminated Film Next, a transparent laminate film 30 according to the present embodiment will be described. As described above, the transparent laminate film 30 may be used in a face shield 10 that protects the face F of a wearer H. As shown in FIGS. 9A to 9D, the transparent laminate film 30 includes a front-surface antireflection layer 40 that forms the front surface 301, and a back-surface antireflection layer 50 that forms the back surface 302. As shown in FIGS. 9A and 9B, the transparent laminate film 30 may further include a transparent adhesive layer 31 that bonds the front-surface antireflection layer 40 and the back-surface antireflection layer 50 together.

[0060] 9A and 9B, the transparent laminate film 30 includes a front-surface antireflection layer 40, a transparent adhesive layer 31, and a back-surface antireflection layer 50, in this order from the front surface 301 to the back surface 302. In this case, in the transparent laminate film 30, the front-surface antireflection layer 40 is exposed outward from the front surface 301 side. In addition, in the transparent laminate film 30, the back-surface antireflection layer 50 is exposed outward from the back surface 302 side.

[0061] 9A and 9B, the front-surface antireflection layer 40 includes a front-surface antireflection functional layer 41 and a front transparent substrate layer 42, which are arranged in this order from the front surface 301 to the back surface 302. The front-surface antireflection functional layer 41 also includes a front refractive layer 43 and a front hard coat layer 44, which are arranged in this order from the front surface 301 to the back surface 302. The front refractive layer 43 further includes a front low refractive index layer 45 and a front high refractive index layer 46, which are arranged in this order from the front surface 301 to the back surface 302. Here, the front high refractive index layer 46 may include a first front high refractive index layer 47 and a second front high refractive index layer 48, which are arranged in this order from the front surface 301 to the back surface 302, as shown in FIG.

[0062] 9A and 9B, the back-surface antireflection layer 50 includes a back-surface antireflection functional layer 51 and a back-surface transparent substrate layer 52, which are arranged in this order from the back surface 302 to the front surface 301. The back-surface antireflection functional layer 51 also includes a back-surface refraction layer 53 and a back-surface hard coat layer 54, which are arranged in this order from the back surface 302 to the front surface 301. The back-surface refraction layer 53 further includes a back-surface low-refractive-index layer 55 and a back-surface high-refractive-index layer 56, which are arranged in this order from the back surface 302 to the front surface 301. Here, as shown in FIG. 9B, the back-surface high-refractive-index layer 56 may include a first back-surface high-refractive-index layer 57 and a second back-surface high-refractive-index layer 58, which are arranged in this order from the back surface 302 to the front surface 301.

[0063] 9C and 9D , the transparent laminate film 30 may further include a core layer 32 located between the front-surface antireflection layer 40 and the back-surface antireflection layer 50. In this case, the transparent laminate film 30 may further include a first transparent adhesive layer 31a that bonds the front-surface antireflection layer 40 and the core layer 32, and a second transparent adhesive layer 31b that bonds the core layer 32 and the back-surface antireflection layer 50.

[0064] 9C and 9D , the transparent laminate film 30 includes, in this order from the front surface 301 to the back surface 302, a front surface antireflection layer 40, a first transparent adhesive layer 31a, a core layer 32, a second transparent adhesive layer 31b, and a back surface antireflection layer 50. In this case, too, in the transparent laminate film 30, the front surface antireflection layer 40 is exposed outward from the front surface 301 side. In addition, in the transparent laminate film 30, the back surface antireflection layer 50 is exposed outward from the back surface 302 side.

[0065] 9C and 9D , the front-surface antireflection layer 40 also includes a front-surface antireflection functional layer 41 and a front transparent substrate layer 42, which are arranged in this order from the front surface 301 to the back surface 302. The front-surface antireflection functional layer 41 also includes a front refractive layer 43 and a front hard coat layer 44, which are arranged in this order from the front surface 301 to the back surface 302. The front refractive layer 43 further includes a front low refractive index layer 45 and a front high refractive index layer 46, which are arranged in this order from the front surface 301 to the back surface 302. Here, the front high refractive index layer 46 may include a first front high refractive index layer 47 and a second front high refractive index layer 48, which are arranged in this order from the front surface 301 to the back surface 302, as shown in FIG. 9D .

[0066] 9C and 9D , the back-surface antireflection layer 50 also includes a back-surface antireflection functional layer 51 and a back-surface transparent substrate layer 52, which are arranged in this order from the back surface 302 to the front surface 301. The back-surface antireflection functional layer 51 also includes a back-surface refraction layer 53 and a back-surface hard coat layer 54, which are arranged in this order from the back surface 302 to the front surface 301. The back-surface refraction layer 53 further includes a back-surface low-refractive-index layer 55 and a back-surface high-refractive-index layer 56, which are arranged in this order from the back surface 302 to the front surface 301. Here, as shown in FIG. 9D , the back-surface high-refractive-index layer 56 may include a first back-surface high-refractive-index layer 57 and a second back-surface high-refractive-index layer 58, which are arranged in this order from the back surface 302 to the front surface 301.

[0067] As described above, the front-surface antireflection layer 40 has a basic configuration in which a front-surface high-refractive index layer 46 and a front-surface low-refractive index layer 45 are provided on a front-surface transparent substrate layer 42. Also, as described above, the back-surface antireflection layer 50 has a basic configuration in which a back-surface high-refractive index layer 56 and a back-surface low-refractive index layer 55 are provided on a back-surface transparent substrate layer 52. The front-surface high-refractive index layer 46 (back-surface high-refractive index layer 56) and the front-surface low-refractive index layer 45 (back-surface low-refractive index layer 55) serve to impart an antireflection function by optical interference function.

[0068] The front-surface antireflection layer 40 (rear-surface antireflection layer 50) may be provided with an antireflection function based on the optical interference function of three or more layers, for example, by providing an additional medium-refractive index layer. However, an excessively multi-layer structure is undesirable from the standpoint of cost-effectiveness. Therefore, the front-surface antireflection layer 40 (rear-surface antireflection layer 50) according to the present embodiment is preferably configured to provide the antireflection function based on the optical interference function of two layers: a front-surface high-refractive index layer 46 (rear-surface high-refractive index layer 56) and a front-surface low-refractive index layer 45 (rear-surface low-refractive index layer 55). The front-surface antireflection layer 40 (rear-surface antireflection layer 50) may also be configured with a front-surface hard-coat layer 44 (rear-surface hard-coat layer 54) having a medium refractive index, thereby providing the antireflection function based on the optical interference function of three layers: a medium-refractive index layer, a high-refractive index layer, and a low-refractive index layer.

[0069] Each layer of the transparent laminate film 30 will be described below.

[0070] <Front and rear anti-reflection layers> The front surface antireflection layer 40 is a layer for suppressing reflection of light incident from the front surface 301 side of the transparent laminate film 30. By providing the transparent laminate film 30 with the front surface antireflection layer 40, it is possible to suppress reflection of light on the front surface 301 of the transparent laminate film 30. This makes it possible to improve the visibility of the face F of the wearer H, for example, when visually recognizing a wearer H wearing the face shield 10. This therefore makes it possible to improve the visibility of the mouth of the wearer H, enabling smooth communication between the wearer H and others.

[0071] On the other hand, the back-surface antireflection layer 50 is a layer for suppressing reflection of light incident from the back surface 302 side of the transparent laminate film 30. Providing the transparent laminate film 30 with the back-surface antireflection layer 50 can suppress reflection of light on the back surface 302 of the transparent laminate film 30. This can prevent, for example, a wearer H wearing the face shield 10 from feeling discomfort or fatigue due to light reflected on the back surface 302 of the transparent laminate film 30.

[0072] As described above, the front-surface antireflection layer 40 has the front-surface antireflection functional layer 41 and the front-surface transparent substrate layer 42. As described above, the back-surface antireflection layer 50 has the back-surface antireflection functional layer 51 and the back-surface transparent substrate layer 52. Here, the front-surface transparent substrate layer 42 and the back-surface transparent substrate layer 52 will first be described.

[0073] [Front transparent substrate layer and rear transparent substrate layer] The front surface transparent substrate layer 42 and the back surface transparent substrate layer 52 are layers that support the front surface antireflection functional layer 41 and the back surface antireflection functional layer 51, for example, and also increase the overall strength of the front surface antireflection layer 40 and the back surface antireflection layer 50. There are no particular restrictions on the material of the front surface transparent substrate layer 42 and the back surface transparent substrate layer 52 as long as they are transparent materials that are used as substrates for general films, but from the viewpoints of material cost, productivity, etc., plastic films, plastic sheets, etc. are preferably used, and these can be selected appropriately depending on the application.

[0074] Examples of materials for plastic films or sheets include various synthetic resins. Preferred examples of synthetic resins include cellulose resins such as triacetyl cellulose (TAC), diacetyl cellulose, acetate butyrate cellulose, and cellophane; polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate-isophthalate copolymer, and polyester-based thermoplastic elastomers; polyolefin resins such as low-density polyethylene (including linear low-density polyethylene), medium-density polyethylene, high-density polyethylene, ethylene-α-olefin copolymer, polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, olefin-based thermoplastic elastomers, and mixtures thereof; acrylic resins such as polymethyl(meth)acrylate, polyethyl(meth)acrylate, and polybutyl(meth)acrylate; polyamide resins such as nylon 6 and nylon 66; polystyrene resin; polycarbonate resin; polyarylate resin; and polyimide resin. The material of the front transparent substrate layer 42 and the back transparent substrate layer 52 may be a cycloolefin polymer (COP) resin or a cycloolefin copolymer (COC) resin.

[0075] The front surface transparent substrate layer 42 and the back surface transparent substrate layer 52 can be made of the above-mentioned plastic films and plastic sheets, either alone or as a mixture of two or more of them, but from the viewpoints of flexibility, toughness, transparency, etc., cellulose resin and polyester resin are more preferred as the materials for the front surface transparent substrate layer 42 and the back surface transparent substrate layer 52. Furthermore, from the viewpoints of flexibility, toughness, transparency, etc., the front surface transparent substrate layer 42 and the back surface transparent substrate layer 52 preferably contain triacetyl cellulose and polyethylene terephthalate.

[0076] The thicknesses of the front transparent substrate layer 42 and the back transparent substrate layer 52 are not particularly limited and are appropriately selected depending on the application. The thicknesses of the front transparent substrate layer 42 and the back transparent substrate layer 52 may each be approximately 5 μm to 130 μm, and preferably 10 μm to 100 μm in consideration of durability, handleability, and the like. The thickness of each layer can be calculated, for example, by measuring the thickness at 20 points on a cross-sectional image taken using a scanning electron microscope (SEM), a transmission electron microscope (TEM), or a scanning transmission electron microscope (STEM) and averaging the values at the 20 points. When the film thickness to be measured is on the order of μm, it is preferable to use an SEM. When the film thickness is on the order of nm, it is preferable to use a TEM or STEM. In the case of an SEM, the acceleration voltage is preferably 1 kV to 10 kV and the magnification is preferably 1,000 times to 7,000 times. In the case of a TEM or STEM, the acceleration voltage is preferably 10 kV to 30 kV and the magnification is preferably 50,000 times to 300,000 times. The thickness of each layer described below can be measured in the same manner as for the thickness of the front transparent substrate layer 42 and the back transparent substrate layer 52 .

[0077] [Front and rear anti-reflection functional layers] Next, we will explain the front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51. The front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51 serve to impart the function of suppressing light reflection to the front-surface antireflection layer 40 and the back-surface antireflection layer 50, respectively.

[0078] Furthermore, the front-surface antireflection functional layer 41 may be a coating layer coated on the front-surface transparent substrate layer 42, and the back-surface antireflection functional layer 51 may be a coating layer coated on the back-surface transparent substrate layer 52. In this way, by using the front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51 as coating layers, the thicknesses of the front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51 can be easily controlled, and desired functions such as the light reflectance and total light transmittance of the transparent laminate film 30 can be easily controlled.

[0079] The front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51 are preferably made of a cured product containing an acrylic monomer, which allows the front-surface antireflection functional layer 41 and the back-surface antireflection functional layer 51 to be formed with high uniformity even with short processing times.

[0080] Here, as described above, the front-surface antireflection functional layer 41 includes the front-surface refraction layer 43 and the front-surface hard-coat layer 44. Furthermore, as described above, the back-surface antireflection functional layer 51 includes the back-surface refraction layer 53 and the back-surface hard-coat layer 54. The front-surface hard-coat layer 44 may be a coating layer coated on the front-surface transparent substrate layer 42, and the front-surface refraction layer 43 may be a coating layer coated on the front-surface hard-coat layer 44. Furthermore, the back-surface hard-coat layer 54 may be a coating layer coated on the back-surface transparent substrate layer 52, and the back-surface refraction layer 53 may be a coating layer coated on the back-surface hard-coat layer 54. Since the front-surface refraction layer 43, the front-surface hard-coat layer 44, the back-surface refraction layer 53, and the back-surface hard-coat layer 54 are coating layers, the thickness of each layer can be easily controlled, and desired functions such as the light reflectance, total light transmittance, and, in some cases, color of the transparent laminate film 30 can be easily controlled.

[0081] Next, the front surface hard coat layer 44 and the back surface hard coat layer 54 will be described.

[0082] {Front hard coat layer and rear hard coat layer} The front hard coat layer 44 and the back hard coat layer 54 serve to improve the scratch resistance of the front antireflection layer 40 and the back antireflection layer 50. Here, "hard coat" refers to a property that exhibits a hardness of "H" or higher in the pencil hardness test specified in JIS K5600-5-4:1999. The front hard coat layer 44 and the back hard coat layer 54 can be formed, for example, from a hard coat layer coating liquid containing a curable resin composition. Examples of the curable resin composition include a thermosetting resin composition or an ionizing radiation-curable resin composition, and from the viewpoint of scratch resistance, an ionizing radiation-curable resin composition is preferred.

[0083] A thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that cures when heated. Examples of thermosetting resins include acrylic resins, urethane resins, phenolic resins, urea-melamine resins, epoxy resins, unsaturated polyester resins, and silicone resins. In a thermosetting resin composition, a curing agent is added to the curable resin as needed.

[0084] The ionizing radiation-curable resin composition is a composition containing a compound having an ionizing radiation-curable functional group (hereinafter also referred to as "ionizing radiation-curable compound"). Examples of the ionizing radiation-curable functional group include ethylenically unsaturated bond groups such as (meth)acryloyl groups, vinyl groups, and allyl groups, as well as epoxy groups and oxetanyl groups. The ionizing radiation-curable compound is preferably a compound having an ethylenically unsaturated bond group, more preferably a compound having two or more ethylenically unsaturated bond groups, and even more preferably a polyfunctional (meth)acrylate compound having two or more ethylenically unsaturated bond groups. Both monomers and oligomers can be used as the polyfunctional (meth)acrylate compound. Ionizing radiation refers to electromagnetic waves or charged particle beams that have an energy quantum capable of polymerizing or crosslinking molecules, among electromagnetic waves or charged particle beams. Ultraviolet (UV) rays or electron beams (EB) are typically used, but other types of electromagnetic waves such as X-rays and gamma rays, as well as charged particle beams such as alpha rays and ion beams, can also be used.

[0085] Among the polyfunctional (meth)acrylate compounds, examples of bifunctional (meth)acrylate monomers include ethylene glycol di(meth)acrylate, bisphenol A tetraethoxydiacrylate, bisphenol A tetrapropoxydiacrylate, and 1,6-hexanediol diacrylate. Examples of trifunctional or higher functional (meth)acrylate monomers include trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol hexa(meth)acrylate, dipentaerythritol tetra(meth)acrylate, and isocyanuric acid-modified tri(meth)acrylate. The (meth)acrylate monomers may be monomers whose molecular skeletons are partially modified, or may be monomers modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol, or the like.

[0086] Examples of polyfunctional (meth)acrylate oligomers include acrylate polymers such as urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate, and polyether (meth)acrylate. Urethane (meth)acrylates can be obtained, for example, by reacting a polyhydric alcohol and an organic diisocyanate with a hydroxy (meth)acrylate. Preferred epoxy (meth)acrylates include (meth)acrylates obtained by reacting a trifunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with (meth)acrylic acid; (meth)acrylates obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a polybasic acid and (meth)acrylic acid; and (meth)acrylates obtained by reacting a difunctional or higher aromatic epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like with a phenol and (meth)acrylic acid. The above ionizing radiation-curable compounds can be used alone or in combination of two or more.

[0087] When the ionizing radiation-curable compound is an ultraviolet-curable compound, the ionizing radiation-curable composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator. Examples of the photopolymerization initiator include one or more selected from acetophenone, benzophenone, α-hydroxyalkylphenone, Michler's ketone, benzoin, benzyl methyl ketal, benzoyl benzoate, α-acyloxime ester, thioxanthones, and the like. These photopolymerization initiators preferably have a melting point of 100°C or higher. By adjusting the melting point of the photopolymerization initiator to 100°C or higher, it is possible to prevent the residual photopolymerization initiator from sublimating due to the heat generated during the transparent conductive film formation or crystallization process, thereby preventing the reduction in resistance of the transparent conductive film from being impaired. The same applies when using photopolymerization initiators in the high refractive index layer and low refractive index layer described below. The photopolymerization accelerator is a material that can reduce polymerization inhibition caused by air during curing and increase the curing rate, and examples thereof include one or more types selected from p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc.

[0088] The thickness of each of the front surface hard coat layer 44 and the back surface hard coat layer 54 is preferably in the range of 0.1 μm to 100 μm, and more preferably in the range of 0.8 μm to 20 μm. If the thickness of each of the front surface hard coat layer 44 and the back surface hard coat layer 54 is within the above range, sufficient hard coat performance is obtained, and the layer is resistant to cracks and breakage due to external impact.

[0089] The refractive index of the front hard coat layer 44 and the back hard coat layer 54 is preferably smaller than the refractive index of the front high refractive index layer 46 and the back high refractive index layer 56, more preferably 1.45 to 1.70, and even more preferably 1.45 to 1.60. When the refractive index of the front hard coat layer 44 and the back hard coat layer 54 is within this range, the front hard coat layer 44 and the back hard coat layer 54 each function as a medium refractive index layer. This enables interference between the three layers of the front hard coat layer 44, the front high refractive index layer 46, and the front low refractive index layer 45, as well as interference between the three layers of the back hard coat layer 54, the back high refractive index layer 56, and the back low refractive index layer 55. This effectively suppresses light reflection. Furthermore, from the perspective of suppressing interference fringes, it is preferable to reduce the difference between the refractive index of the front hard coat layer 44 and the back hard coat layer 54 and the refractive index of the front transparent substrate layer 42 and the back transparent substrate layer 52.

[0090] The front hard coat layer 44 and the back hard coat layer 54 can be provided with the function of a medium refractive index layer by blending a high refractive index resin into the hard coat layer coating solution or by blending high refractive index particles. Blending high refractive index particles can cause whitening or coating defects due to particle aggregation, so the former method (blending a high refractive index resin) is preferred. Examples of high refractive index resins include the above-mentioned thermosetting resins or ionizing radiation curable compounds into which sulfur-, phosphorus-, or bromine-containing groups or aromatic rings have been introduced. The high refractive index particles can be the same as the high refractive index particles used in the front high refractive index layer 46 and the back high refractive index layer 56 described below.

[0091] The refractive index of each layer, such as the front surface hard coat layer 44 and the back surface hard coat layer 54, can be calculated, for example, by fitting a reflection spectrum measured with a reflectance photometer to a reflection spectrum calculated from an optical model of a multilayer thin film using Fresnel coefficients.

[0092] The front surface hard coat layer 44 and the back surface hard coat layer 54 can be formed by preparing a coating liquid for forming a hard coat layer using the above-mentioned curable resin composition, additives such as an ultraviolet absorber and a leveling agent which are blended as necessary, and a dilution solvent, applying the coating liquid onto a transparent substrate by a conventionally known coating method, drying the coating liquid, and curing it by irradiation with ionizing radiation as necessary.

[0093] {Front and rear refractive layers} Next, the front surface refraction layer 43 and the back surface refraction layer 53 will be described. The front surface refraction layer 43 and the back surface refraction layer 53 serve to reduce the light reflectance of the front surface antireflection layer 40 and the back surface antireflection layer 50. As described above, the front surface refraction layer 43 includes the front surface low refraction layer 45 and the front surface high refraction layer 46. Also, as described above, the back surface refraction layer 53 includes the back surface low refraction layer 55 and the back surface high refraction layer 56. Here, the front surface low refraction layer 45 and the back surface low refraction layer 55 will first be described.

[0094] (Front and rear low refractive index layers) The front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 are layers provided on the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56, and utilize the difference in refractive index between the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 to reduce the light reflectance of the front-surface antireflection layer 40 and the back-surface antireflection layer 50 through interference. To achieve ultra-low reflectance in the front-surface antireflection layer 40 and the back-surface antireflection layer 50, the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 preferably have a refractive index of 1.26 or more and 1.40 or less, more preferably 1.28 or more and 1.38 or less, and even more preferably 1.30 or more and 1.32 or less. The lower the refractive index of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55, the lower the refractive index of the front-surface antireflection layer 40 and the back-surface antireflection layer 50 can be achieved without significantly increasing the refractive index of the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56. On the other hand, if the refractive indexes of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 are too low, the strength of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 tends to decrease. Therefore, by setting the refractive indexes of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 within the above ranges, the amount of high-refractive-index particles (described below) added to the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 can be reduced while maintaining the strength of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55, which is advantageous in that it leads to suppression of color and whitening. Furthermore, the thicknesses of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 are preferably 80 nm or more and 120 nm or less, more preferably 85 nm or more and 110 nm or more, and even more preferably 90 nm or more and 105 nm or more. Furthermore, the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 may each be formed from multiple layers satisfying the above-mentioned refractive index ranges. However, from a cost-effectiveness perspective, two or fewer layers are preferred, and a single layer is more preferred.

[0095] Methods for forming the front low refractive index layer 45 and the back low refractive index layer 55 can be broadly divided into wet methods and dry methods. Wet methods include a sol-gel method using a metal alkoxide or the like, a method of applying a low refractive index resin such as a fluororesin, and a method of applying a low refractive index layer-forming coating liquid containing low refractive index particles in a resin composition. Dry methods include a method of selecting particles having a desired refractive index from the low refractive index particles described below and forming the layers by physical vapor deposition or chemical vapor deposition. Wet methods are superior in terms of production efficiency, and in this embodiment, among wet methods, it is preferable to form the layers using a low refractive index layer-forming coating liquid containing low refractive index particles in a resin composition.

[0096] Low refractive index particles are preferably used to reduce the refractive index, i.e., to improve antireflection properties. Either inorganic particles such as silica or magnesium fluoride, or organic particles can be used without limitation. However, from the viewpoint of further improving antireflection properties and ensuring good surface hardness, particles having a structure in which the particles themselves have voids are preferably used.

[0097] Particles with a porous structure have microscopic voids inside, which are filled with a gas such as air with a refractive index of 1.0, resulting in a low refractive index. Examples of such porous particles include inorganic or organic porous particles and hollow particles, such as porous silica, hollow silica particles, and porous polymer particles or hollow polymer particles made from acrylic resins. Preferred examples of inorganic particles include porous silica particles prepared using the technology disclosed in JP 2001-233611 A. Preferred examples of organic particles include hollow polymer particles prepared using the technology disclosed in JP 2002-80503 A. The above-mentioned porous silica or porous silica has a refractive index in the range of 1.18 to 1.44, which is lower than that of typical silica particles, which have a refractive index of around 1.45. Therefore, these porous silica particles are preferred from the perspective of achieving a low refractive index for the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55.

[0098] The hollow silica particles are particles that have the function of lowering the refractive index of the front-surface low refractive index layer 45 and the back-surface low refractive index layer 55 while maintaining their coating strength. The hollow silica particles used in this embodiment are silica particles with a structure having internal cavities. The hollow silica particles are silica particles whose refractive index decreases in inverse proportion to the occupancy rate of the internal cavities compared to the inherent refractive index of the silica particles (refractive index n = approximately 1.45). Therefore, the refractive index of the hollow silica particles as a whole is 1.18 or more and 1.44 or less.

[0099] The hollow silica particles are not particularly limited, and examples thereof include particles having an outer shell and a porous or hollow interior, such as silica particles prepared using the techniques disclosed in JP-A-6-330606, JP-A-7-013137, JP-A-7-133105, and JP-A-2001-233611.

[0100] The average particle diameter of the primary particles of the low-refractive-index particles is preferably 5 nm to 200 nm, more preferably 5 nm to 100 nm, and even more preferably 10 nm to 80 nm. When the average particle diameter of the primary particles is within the above range, the transparency of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 is not impaired and a good particle dispersion state is obtained. In particular, hollow particles having an average particle diameter of 70 nm to 80 nm are preferred as the low-refractive-index particles because they can increase the porosity and reduce the refractive index while maintaining a shell thickness that does not result in insufficient strength, and also because they are well balanced with the ideal thickness (approximately 100 nm) of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 for reducing reflectance.

[0101] The low-refractive-index particles used in this embodiment are preferably surface-treated particles. Surface treatment of the low-refractive-index particles is more preferably performed using a silane coupling agent, and among these, surface treatment using a silane coupling agent having a (meth)acryloyl group is preferred. By performing a surface treatment on the low-refractive-index particles, the affinity with the binder resin described below is improved, the particles are uniformly dispersed, and the particles are less likely to aggregate. This prevents the decrease in transparency of the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 due to particle size increase caused by aggregation, as well as the decrease in the applicability of the layer-forming composition and the coating strength of the composition.

[0102] Furthermore, when the silane coupling agent has a (meth)acryloyl group, the silane coupling agent is ionizing radiation-curable and therefore readily reacts with the binder resin described below, thereby effectively fixing the low-refractive-index particles to the binder resin in the coating film of the layer-forming composition. In other words, the low-refractive-index particles function as a crosslinker in the binder resin. This provides a tightening effect for the entire coating film, imparting excellent surface hardness to the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 while retaining the inherent flexibility of the binder resin. Therefore, the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 utilize their own flexibility to deform, providing them with the ability to absorb and restore external impacts, thereby suppressing the occurrence of scratches and resulting in a layer with high surface hardness and excellent scratch resistance.

[0103] Examples of silane coupling agents that are preferably used in the surface treatment of low refractive index particles include 3-(meth)acryloxypropyltrimethoxysilane, 3-(meth)acryloxypropyltriethoxysilane, 3-(meth)acryloxypropylmethyldimethoxysilane, 3-(meth)acryloxypropylmethyldiethoxysilane, 2-(meth)acryloxypropyltrimethoxysilane, and 2-(meth)acryloxypropyltriethoxysilane.

[0104] The content of low-refractive-index particles in the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 is preferably 10 to 250 parts by mass, more preferably 50 to 200 parts by mass, and even more preferably 100 to 180 parts by mass, per 100 parts by mass of the resin in the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55. When the content of low-refractive-index particles is within the above range, good anti-reflection properties and surface hardness are obtained. Furthermore, the proportion of hollow particles and / or porous particles in the total low-refractive-index particles contained in the front-surface low-refractive-index layer 45 and the back-surface low-refractive-index layer 55 is preferably 70% by mass or more, more preferably 80% by mass or more, and even more preferably 80% by mass or more and 95% by mass or less.

[0105] Resin compositions contained in the layer-forming coating liquid include curable resin compositions. The curable resin compositions can be similar to the materials exemplified in the description of the front-surface hard coat layer 44 and the back-surface hard coat layer 54, with ionizing radiation-curable resin compositions being preferred. Furthermore, fluorine-containing polymers and fluorine monomers that themselves exhibit a low refractive index are also preferred resin compositions. Fluorine-containing polymers are polymers of polymerizable compounds that contain at least fluorine atoms in the molecule, and are suitable for imparting antifouling properties and slip properties. The fluorine-containing polymer is preferably a polymer that has reactive groups in the molecule and functions as a curable resin composition, and more preferably a polymer that has ionizing radiation-curable reactive groups and functions as an ionizing radiation-curable resin composition.

[0106] The fluorine-containing polymer is preferably a polymer containing silicon as well as fluorine, in order to not only repel dirt from the surface of the low refractive index layer but also to provide the repelled dirt with easy wiping properties. For example, a silicone-containing vinylidene fluoride copolymer, in which a silicone component is incorporated into the copolymer, is preferred. Examples of silicone components in this case include (poly)dimethylsiloxane, (poly)diethylsiloxane, (poly)diphenylsiloxane, (poly)methylphenylsiloxane, alkyl-modified (poly)dimethylsiloxane, azo-group-containing (poly)dimethylsiloxane, dimethylsilicone, phenylmethylsilicone, alkyl-aralkyl-modified silicone, fluorosilicone, polyether-modified silicone, fatty acid ester-modified silicone, methylhydrogen silicone, silanol-group-containing silicone, alkoxy-group-containing silicone, phenol-group-containing silicone, methacrylic-modified silicone, acrylic-modified silicone, amino-modified silicone, carboxylic acid-modified silicone, carbinol-modified silicone, epoxy-modified silicone, mercapto-modified silicone, fluorine-modified silicone, and polyether-modified silicone. Among these, components having a dimethylsiloxane structure are preferred as the silicone component.

[0107] The front surface low refractive index layer 45 and the back surface low refractive index layer 55 can be formed, for example, by preparing a layer-forming coating liquid using low refractive index particles, a resin composition, additives such as an ultraviolet absorber and a leveling agent that are blended as needed, and a dilution solvent, and then applying the coating liquid onto the front surface high refractive index layer 46 or the back surface high refractive index layer 56 by a conventionally known coating method, drying the coating liquid, and, if needed, curing the coating liquid by irradiating it with ionizing radiation.

[0108] (Front and rear high refractive index layers) The front surface high refractive index layer 46 and the back surface high refractive index layer 56 serve to reduce the light reflectance of the front surface antireflection layer 40 and the back surface antireflection layer 50 through interference action, utilizing the difference in refractive index between them and the front surface low refractive index layer 45 and the back surface low refractive index layer 55. The front surface high refractive index layer 46 and the back surface high refractive index layer 56 can each be formed from a layer-forming coating liquid containing, for example, a curable resin composition and high refractive index particles.

[0109] The front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 preferably have a high refractive index from the viewpoint of achieving ultra-low reflectance for the front-surface antireflection layer 40 and the back-surface antireflection layer 50. However, a high refractive index requires a large amount of high-refractive-index particles, which can lead to aggregation of the high-refractive-index particles and cause whitening. Therefore, the refractive index is preferably 1.55 to 1.85, and more preferably 1.56 to 1.70. Furthermore, the thickness of the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 is preferably 200 nm or less, and more preferably 50 nm to 180 nm. When the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 each have a two-layer structure as described below, the total thickness of the two layers preferably satisfies the above-mentioned value. Furthermore, the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 may be formed from multiple layers satisfying the above-mentioned refractive index range. However, from a cost-effective perspective, two or fewer layers are preferred, and a single layer is more preferred.

[0110] Examples of high-refractive-index particles include antimony pentoxide (1.79), zinc oxide (1.90), titanium oxide (2.3 to 2.7), cerium oxide (1.95), tin-doped indium oxide (1.95 to 2.00), antimony-doped tin oxide (1.75 to 1.85), yttrium oxide (1.87), and zirconium oxide (2.10). The parentheses indicate the refractive index of the material of each particle. Among these high-refractive-index particles, particles with a refractive index exceeding 2.0 are preferred, as they can achieve the desired refractive index with a small amount of addition. Furthermore, conductive high-refractive-index particles such as antimony pentoxide, tin-doped indium oxide (ITO), and antimony-doped tin oxide (ATO) have free electrons whose plasma frequency is in the near-infrared region. Due to the plasma oscillation of these free electrons, some light in the visible light region is absorbed or reflected, making it difficult to suppress color. For this reason, the high-refractive-index particles are preferably non-conductive particles. For these reasons, among the high-refractive-index particles exemplified above, titanium oxide and zirconium oxide are preferred, and zirconium oxide is the most suitable from the viewpoint of high durability and stability, such as light resistance. If it is desired to impart antistatic properties to the front-surface antireflection layer 40 and the back-surface antireflection layer 50, it is preferred that the front-surface high-refractive-index layer 46 and the back-surface high-refractive-index layer 56 have a two-layer structure, as described below, with conductive high-refractive-index particles contained in one of the layers.

[0111] The average particle size of the primary particles of the high refractive index particles is preferably 5 nm or more and 200 nm or less, more preferably 5 nm or more and 100 nm or less, and even more preferably 10 nm or more and 80 nm or less. The average particle size of the primary particles of the high refractive index particles and the low refractive index particles described later can be calculated by the following steps (1) to (3). (1) Surface images of the particles themselves or of a material prepared by coating and drying a particle dispersion on a transparent substrate are taken using SEM, TEM, or STEM. (2) Randomly extract 10 particles from the surface image, measure the long and short diameters of each particle, and calculate the particle diameter of each particle from the average of the long and short diameters. The long diameter is the longest diameter on the screen, and the short diameter is the distance between the two points where a line segment perpendicular to the midpoint of the line segment that constitutes the long diameter intersects with the particle. (3) Repeat the same procedure five times on separate images of the same sample, and use the number average of the particle diameters of a total of 50 particles as the average particle diameter. When calculating the average particle size of particles, if the calculated average particle size is on the order of μm, it is preferable to use SEM, and if the calculated average particle size is on the order of nm, it is preferable to use TEM or STEM. In the case of SEM, the acceleration voltage is preferably 1 kV to 10 kV and the magnification is preferably 1,000 to 7,000 times, and in the case of TEM or STEM, the acceleration voltage is preferably 10 kV to 30 kV and the magnification is preferably 50,000 to 300,000 times.

[0112] From the viewpoint of a balance between increasing the refractive index, suppressing color tone, and suppressing whitening, the content of the high refractive index particles is preferably 30 parts by mass or more and 400 parts by mass or less, more preferably 50 parts by mass or more and 200 parts by mass or less, and even more preferably 80 parts by mass or more and 150 parts by mass or less, relative to 100 parts by mass of the curable resin composition.

[0113] The front surface high refractive index layer 46 and the back surface high refractive index layer 56 are preferably dispersion stabilized to prevent excessive aggregation of the high refractive index particles. One example of a dispersion stabilization method is to add another high refractive index particle with a lower surface charge than the base high refractive index particle. This method allows the base high refractive index particles to moderately gather around the other high refractive index particle, thereby preventing excessive aggregation of the base high refractive index particles. Other dispersion stabilization methods include using surface-treated high refractive index particles or adding a dispersant to the layer-forming coating solution.

[0114] The curable resin composition for forming the front surface high refractive index layer 46 and the back surface high refractive index layer 56 may be: Materials similar to those exemplified in the description of the front hard coat layer 44 and the back hard coat layer 54 can be used, and an ionizing radiation curable resin composition is preferred. Furthermore, to achieve the above-mentioned refractive index without adding an excessive amount of high-refractive-index particles, it is preferable to use a curable resin composition with a high refractive index. The refractive index of the curable resin composition is preferably about 1.54 or more and 1.70 or less.

[0115] As described above, the surface high refractive index layer 46 may include a first surface high refractive index layer 47 and a second surface high refractive index layer 48. In this case, the refractive index of the first surface high refractive index layer 47 is preferably higher than the refractive index of the second surface high refractive index layer 48. This increases the refractive index difference between the surface high refractive index layer 46 and the surface low refractive index layer 45, thereby reducing the reflectance of the surface antireflection layer 40 and reducing the refractive index difference between the surface high refractive index layer 46 and the surface hard coat layer 44, thereby suppressing the occurrence of interference fringes.

[0116] As described above, the back surface high refractive index layer 56 may include a first back surface high refractive index layer 57 and a second back surface high refractive index layer 58. In this case, as in the case of the front surface high refractive index layer 46, the refractive index of the first back surface high refractive index layer 57 is preferably higher than the refractive index of the second back surface high refractive index layer 58. This increases the refractive index difference between the back surface high refractive index layer 56 and the back surface low refractive index layer 55, thereby reducing the reflectance of the back surface antireflection layer 50 and reducing the refractive index difference between the back surface high refractive index layer 56 and the back surface hard coat layer 54, thereby suppressing the occurrence of interference fringes.

[0117] Furthermore, when the front surface high-refractive index layer 46 and the back surface high-refractive index layer 56 each have a two-layer structure, the refractive index of the first front surface high-refractive index layer 47 and the first back surface high-refractive index layer 57 is preferably 1.60 or more and 1.85 or less, and the refractive index of the second front surface high-refractive index layer 48 and the second back surface high-refractive index layer 58 is preferably 1.55 or more and 1.70 or less. Furthermore, in the above two-layer structure, it is preferable that one layer contains conductive high-refractive index particles and the other layer contains non-conductive high-refractive index particles, and that the thickness of the layer containing the conductive high-refractive index particles is less than the thickness of the layer containing the non-conductive high-refractive index particles. This structure can impart antistatic properties while minimizing the amount of conductive high-refractive index particles, which can cause color tint. Furthermore, conductive high-refractive index particles are preferably networked within the layer to impart antistatic properties with a small amount, thereby suppressing color tint and whitening.

[0118] The front surface high refractive index layer 46 and the back surface high refractive index layer 56 can be formed by preparing a layer-forming coating liquid using high refractive index particles, a curable resin composition, and additives such as an ultraviolet absorber and a leveling agent, which are blended as needed, and a dilution solvent, and applying the coating liquid onto the front surface hard coat layer 44 or the back surface hard coat layer 54 by a conventionally known coating method, drying the coating liquid, and, as needed, curing the coating liquid by irradiation with ionizing radiation.

[0119] [Transparent adhesive layer, first transparent adhesive layer, and second transparent adhesive layer] Transparent adhesive layers such as the transparent adhesive layer 31, the first transparent adhesive layer 31a, and the second transparent adhesive layer 31b are layers for bonding the front-surface antireflection layer 40, the back-surface antireflection layer 50, the core layer 32, and the like to one another. Here, the term "transparent adhesive layer" in this specification encompasses a transparent adhesive layer. Transparent adhesive layers can be formed using various materials commonly used as adhesives. Examples include acrylic adhesives, urethane adhesives, olefin adhesives, rubber adhesives, silicone adhesives, and polyester adhesives. Acrylic adhesives, which have high transparency and can increase adhesive strength, are preferred.

[0120] Each of the above adhesives can contain various functionalizing agents, stabilizers, etc., as long as transparency is not impaired. Tackifiers can also be added to enhance adhesive strength. Crosslinking agents, such as isocyanates, epoxies, and double-bond-containing compounds, can be used to create crosslinked structures depending on the resin.

[0121] The transparent adhesive layer can also be formed using a type of adhesive (OCA, Optical Clear Adhesive) laminated on both sides with a release film. Commercially available products can also be used, such as the LUCIACS series of optically transparent adhesive sheets (manufactured by Nitto Denko Corporation), the 5400A series of highly transparent double-sided tapes (manufactured by Sekisui Chemical Co., Ltd.), the Opteria series of optically transparent adhesive sheets (manufactured by Lintec Corporation), the SANCUARY series (manufactured by San-A Kaken Co., Ltd.), the OAD series of optically transparent adhesives (manufactured by Toyo Packaging Co., Ltd.), the RA series of optical coreless double-sided tapes (manufactured by Sumiron Co., Ltd.), and the PD-S1 series of Panaclean adhesives (manufactured by Panac Corporation). The adhesive strength of these adhesives is generally 10 N / 25 mm or more.

[0122] The thickness of the transparent adhesive layer is not particularly limited, but is preferably, for example, 2 μm or more and 200 μm or less. If the thickness of the transparent adhesive layer is 2 μm or more, the front-surface antireflection layer 40 and the back-surface antireflection layer 50 can be reliably bonded, and if the thickness of the transparent adhesive layer is 200 μm or less, transparency (light transmittance) can be maintained. The lower limit of the thickness of the transparent adhesive layer is more preferably 5 μm or more, 10 μm or more, or 15 μm or more, and the upper limit is more preferably 150 μm or less, 160 μm or less, or 170 μm or less.

[0123] The method for forming the transparent adhesive layer is not particularly limited, and can employ known methods used in the production of pressure-sensitive adhesive tapes, etc. Specifically, the transparent adhesive layer can be formed by any method, such as a method in which a coating of a pressure-sensitive adhesive composition prepared by dissolving or dispersing the components forming the transparent adhesive layer in an appropriate organic solvent or water is applied to the surface of a substrate, followed by drying and curing, a method in which the components forming the transparent adhesive layer, a double bond-containing monomer, an oligomer, a crosslinking agent, etc. are applied to a substrate without a solvent, and then crosslinked by radiation or the like, or an extrusion lamination method.

[0124] When using OCA, a transparent adhesive layer can be formed by peeling off the release film on the light release side of the OCA and bonding the adhesive surface to the substrate.

[0125] [Core layer] The core layer 32 serves to support the front-surface antireflection layer 40 and the back-surface antireflection layer 50. As the material for the core layer 32, the same materials as those for the front-surface transparent substrate layer 42 and the back-surface transparent substrate layer 52 described above can be used.

[0126] There are no particular limitations on the thickness of the core layer 32 and it is selected appropriately depending on the application. The thickness of the core layer 32 may be approximately 5 μm or more and 130 μm or less, and considering durability, handling, etc., it is preferably 10 μm or more and 100 μm or less.

[0127] The transparent laminate film 30 described above preferably has a thickness of 60 μm or more and 500 μm or less. When the transparent laminate film 30 has a thickness of 60 μm or more, droplets of the wearer H's saliva or the like can be effectively prevented from adhering to the face of another person, and droplets of another person's saliva or the like can be effectively prevented from adhering to the face of the wearer H. Furthermore, when the transparent laminate film 30 has a thickness of 500 μm or less, the transparency of the transparent laminate film 30 can be improved.

[0128] Furthermore, the transparent laminate film 30 preferably has a restoring function. This allows the transparent laminate film 30 to return to a flat shape when folded or rolled. Here, the restoring function means a function that allows an object (the transparent laminate film 30) to return to a flat shape without forming creases even after being bent for a certain period of time.

[0129] The transparent laminate film 30 preferably has a light reflectance of 1.0% or less and a total light transmittance (JIS K7361-1:1997) of 90% or more. This further improves the visibility of the transparent laminate film 30 when viewed from the front surface 301 side, while also further improving the visibility of the transparent laminate film 30 when viewed from the back surface 302 side. The transparent laminate film 30 more preferably has a total light transmittance of 92% or more. The transparent laminate film 30 also preferably has a haze (JIS K7136:2000) of 1.0% or less, more preferably 0.5% or less, and even more preferably 0.3% or less.

[0130] The above-described transparent laminate film 30 preferably has a transmittance of 1% or less in the ultraviolet region with a wavelength of 380 nm or less, which can prevent the wearer H from getting sunburned even when the wearer H wearing the face shield 10 works in an environment exposed to direct sunlight.

[0131] The above-described transparent laminate film 30 preferably has a bending stress of 6 N / 20 mm or less. This improves the flexibility of the transparent laminate film 30. Therefore, when the shield section 30A made from the transparent laminate film 30 is bent, the transparent laminate film 30 can prevent creases, scratches, and the like from occurring in the shield section 30A.

[0132] In the transparent laminate film 30 described above, the arithmetic mean roughness Ra (JIS B0601:1994) of the front surface 301 and the back surface 302 is preferably 10 nm or less, more preferably 1 nm or more and 8 nm or less. Furthermore, the ten-point mean roughness Rz (JIS B0601:1994) of the front surface 301 and the back surface 302 is preferably 160 nm or less, more preferably 50 nm or more and 155 nm or less. Ra and Rz within the above ranges provide smoothness and improved scratch resistance.

[0133] Transparent laminated film and method for manufacturing face shield Next, a method for manufacturing the transparent laminate film and face shield according to the present embodiment will be described. First, a method for manufacturing the transparent laminate film 30 will be described.

[0134] First, the front-surface antireflection layer 40 is prepared. In this process, for example, a resin film constituting the front-surface transparent substrate layer 42 is first prepared. Next, a coating liquid for forming a hard coat layer is applied to the resin film, followed by drying and ultraviolet irradiation, to form a front-surface hard coat layer 44. Next, a coating liquid for forming a high refractive index layer is applied to the front-surface hard coat layer 44, followed by drying and ultraviolet irradiation, to form a front-surface high refractive index layer 46. Next, a coating liquid for forming a low refractive index layer is applied to the front-surface high refractive index layer 46, followed by drying and ultraviolet irradiation, to form a front-surface low refractive index layer 45. In this manner, the front-surface antireflection layer 40 can be obtained.

[0135] The back surface antireflection layer 50 is also produced. In this process, for example, a resin film constituting the back surface transparent substrate layer 52 is first prepared. Next, a hard coat layer-forming coating liquid is applied to the resin film, followed by drying and ultraviolet irradiation, to form the back surface hard coat layer 54. Next, a high refractive index layer-forming coating liquid is applied to the back surface hard coat layer 54, followed by drying and ultraviolet irradiation, to form the back surface high refractive index layer 56. Next, a low refractive index layer-forming coating liquid is applied to the back surface high refractive index layer 56, followed by drying and ultraviolet irradiation, to form the back surface low refractive index layer 55. In this manner, the back surface antireflection layer 50 can be obtained.

[0136] The front-surface antireflection layer 40 and the back-surface antireflection layer 50 are then bonded to each other via the transparent adhesive layer 31 to produce the transparent laminate film 30. In this manner, the transparent laminate film 30 can be produced.

[0137] Next, a surface protective film 61 is attached to the front surface 301 of the obtained transparent laminate film 30, and a back surface protective film 62 is attached to the back surface 302. At this time, the surface protective film 61 and the back surface protective film 62 may each include an adhesive layer (not shown) and be attached to the transparent laminate film 30 by this adhesive layer. In this manner, the transparent laminate film 60 with protective films can be produced. Note that the surface protective film 61 and the back surface protective film 62 may be attached separately to the front surface antireflection layer 40 and the back surface antireflection layer 50, respectively, before the front surface antireflection layer 40 and the back surface antireflection layer 50 are bonded to each other via the transparent adhesive layer 31.

[0138] Next, the face shield 10 is produced.

[0139] In this case, first, the protective film-attached transparent laminate film 60 is processed into a predetermined shape. In this case, the protective film-attached transparent laminate film 60 may be processed by punching using a die, cutting using a drill, or laser processing using a laser. From the viewpoints of processing speed and productivity, the protective film-attached transparent laminate film 60 is preferably processed by punching.

[0140] Next, the front surface protective film 61 and the back surface protective film 62 are removed from the protective film-attached transparent laminate film 60 that has been processed into a predetermined shape, thereby obtaining the transparent laminate film 30 that has been processed into a predetermined shape (see FIG. 4).

[0141] Thereafter, the first engaging portion 75a is engaged with the first locking portion 76a, and the second engaging portion 75b is engaged with the second locking portion 76b. This forms a first curved surface 77a, a second curved surface 77b, and a third curved surface 77c on the transparent laminate film 30. In this manner, the shield part 30A is assembled.

[0142] In addition, the holding member 20 is produced in parallel with the production of the transparent laminate film 30. At this time, for example, the holding member 20 shown in FIG. 1 is produced by bending a rod-shaped member made of aluminum.

[0143] Next, the attachment portion 25 of the holding member 20 is inserted into the opening 80 formed in the transparent laminate film 30. In this way, the face shield 10 shown in FIG.

[0144] As described above, according to this embodiment, the holding member 20 has a pair of temple portions 21, each including an ear hook portion 22 that is attached to the ear E of the wearer H, and a connecting portion 23 that connects the pair of temple portions 21 to each other from behind the wearer H. Furthermore, no other members extending between the pair of temple portions 21 are arranged in front of the wearer H. This makes it possible to prevent interference between the eyeglasses and the holding member 20 when the wearer H is wearing eyeglasses. Furthermore, because no other members extending between the pair of temple portions 21 are arranged in front of the wearer H, it is possible to prevent the holding member 20 from being conspicuous. Therefore, it is possible to provide a face shield 10 that is comfortable to wear.

[0145] Furthermore, according to this embodiment, the pair of temple portions 21 extend parallel to each other forward of the ear hook portions 22, or extend such that the distance between the pair of temple portions 21 increases as they extend forward. This prevents the portions of the pair of temple portions 21 that are located forward of the ear hook portions 22 from coming into contact with the wearer H. This prevents the head of the wearer H from being tightly gripped by the pair of temple portions 21. As a result, discomfort to the wearer H can be prevented, and the wearer H can wear the face shield 10 without feeling any stress.

[0146] Furthermore, according to the present embodiment, weights 24 that adjust the inclination of temple portions 21 relative to the horizontal direction are attached to connecting portions 23. This makes it possible to prevent shield portion 30A from coming into contact with face F of wearer H.

[0147] Furthermore, according to the present embodiment, the holding member 20 is made of a rod-shaped member made of metal, which makes it possible to prevent the holding member 20 from being damaged even if the face shield 10 is dropped.

[0148] Furthermore, according to this embodiment, the metal constituting the rod-shaped member is aluminum, which allows the holding member 20 to be easily formed. In addition, the weight of the holding member 20 can be reduced.

[0149] Furthermore, according to this embodiment, the holding member 20 includes a pair of attachment portions 25 for holding the transparent laminate film 30, and openings 80 into which the attachment portions 25 are inserted are formed near the pair of side edges 73 of the transparent laminate film 30. In this case, by inserting the attachment portions 25 into the openings 80, the holding member 20 can easily hold the transparent laminate film 30.

[0150] Furthermore, according to the present embodiment, the holding member 20 holds the transparent laminate film 30 so that it can move up and down. As a result, even if the shield portion 30A comes into contact with a surrounding structure, the shield portion 30A moves relative to the holding member 20, which can prevent the wearer H from receiving an impact from the face shield 10 or prevent the face shield 10 from coming off the wearer H.

[0151] In the above-described embodiment, the transparent laminate film 30 has the second curved surface 77b and the third curved surface 77c formed thereon, but this is not limiting. For example, the transparent laminate film 30 does not necessarily have to have the second curved surface 77b and the third curved surface 77c formed thereon.

[0152] In the above-described embodiment, the temple portion 21 and the connecting portion 23 are integrally molded, but the present invention is not limited to this. For example, as shown in Fig. 10, the connecting portion 23 may be provided separately from the temple portion 21. The connecting portion 23 may adjust the inclination of the temple portion 21 relative to the horizontal direction.

[0153] In this case, as shown in FIG. 11 , the connecting portion 23 may include a main body portion 23a extending in a substantially arcuate shape and engaging portions 23b provided on both ends of the main body portion 23a. Each of the engaging portions 23b may have a through-hole 23c formed therein. The connecting portion 23 may be attached to the temple portion 21 by inserting the temple portion 21 into the through-hole 23c. In this case, for example, by adjusting the position of the connecting portion 23 relative to the temple portion 21, the inclination of the temple portion 21 relative to the horizontal direction can be adjusted by the weight of the connecting portion 23. The shape of the through-hole 23c may be circular in a front view, or preferably polygonal, such as rectangular. The polygonal shape of the through-hole 23c in a front view allows the connecting portion 23 to stably hold the temple portion 21, thereby maintaining the desired inclination of the temple portion 21 relative to the horizontal direction. In this case, it is preferable that the cross section of the temple portion 21 taken along a direction perpendicular to the longitudinal direction of the temple portion 21 has a polygonal shape such as a quadrangle.

[0154] According to this modification, the connecting portions 23 are provided separately from the temple portions 21, and adjust the inclination of the temple portions 21 relative to the horizontal direction. This makes it possible to prevent the shield portion 30A from coming into contact with the face F of the wearer H. Furthermore, when the connecting portions 23 are provided separately from the temple portions 21, the size of the connecting portions 23 can be changed to match the size of the head of the wearer H. By appropriately changing the size of the connecting portions 23, it is possible to prevent the head of the wearer H from being tightly gripped by the pair of temple portions 21. This prevents the wearer H from feeling uncomfortable, and allows the wearer H to wear the face shield 10 without feeling stress.

[0155] < Second embodiment > Next, a second embodiment will be described with reference to Figures 12 to 17. The second embodiment shown in Figures 12 to 17 differs from the first embodiment mainly in the configuration of the shielding section (transparent laminate film). In Figures 12 to 17, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0156] As shown in Figures 12 to 17, in this embodiment as well, the transparent laminate film 30 constituting the shield portion 30A has a rectangular shape (see Figure 17) having an upper edge 71, a lower edge 72 opposite to the upper edge 71, and a pair of side edges 73 extending between the upper edge 71 and the lower edge 72.

[0157] 13 to 17, a first lower panel 91a and a second lower panel 92a are provided near the bottom edge 72 and are arranged along the extension direction of the bottom edge 72 (the left-right direction in FIG. 17). In addition, a lower fixing panel 95a that fixes the first lower panel 91a and the second lower panel 92a is provided closer to the top edge 71 than the first lower panel 91a and the second lower panel 92a.

[0158] The first lower panel 91a and the second lower panel 92a each have a pentagonal shape with one corner of a rectangle cut out when viewed from the front. Specifically, the first lower panel 91a has a pentagonal shape with the upper right corner of a rectangle cut out when viewed from the front. On the other hand, the second lower panel 92a has a pentagonal shape with the upper left corner of a rectangle cut out when viewed from the front. The first lower panel 91a and the second lower panel 92a are symmetrical with respect to the first lower cutout portion 101a, which will be described later. The lower fixing panel 95a has a triangular shape when viewed from the front.

[0159] The first lower panel 91a and the second lower panel 92a are separated from each other by a first lower cutout 101a that penetrates the transparent laminate film 30. This first lower cutout 101a is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17).

[0160] The first lower panel 91a and the lower fixing panel 95a are separated from each other by a second lower cutout 102a that penetrates the transparent laminate film 30. The second lower panel 92a and the lower fixing panel 95a are separated from each other by a third lower cutout 103a that penetrates the transparent laminate film 30. The second lower cutout 102a and the third lower cutout 103a are formed along directions that slope in both the extension direction of the bottom edge 72 (the left-right direction in FIG. 17) and the extension direction of the side edge 73 (the up-down direction in FIG. 17). The third lower cutout 103a and the fourth lower cutout 104a are connected to each other and to the first lower cutout 101a.

[0161] Then, by fixing the first lower panel 91a and the second lower panel 92a to the lower fixing panel 95a in a state where they are overlapped with each other, a first lower curved surface 96a (see FIGS. 12, 13, 14, and 16) that curves convexly away from the wearer H is formed near the lower edge 72. As a result, droplets that are scattered downward adhere to the first lower curved surface 96a. This makes it possible to prevent droplets from falling below the face shield 10. As a result, it is possible to prevent droplets that are scattered downward from adhering to surrounding structures.

[0162] Furthermore, because the first lower curved surface 96a is curved so as to be convex on the side away from the wearer H, the area where the first lower curved surface 96a is formed is prone to elastic deformation when an impact is applied to that area. Therefore, even if the face shield 10 is dropped, the area where the first lower curved surface 96a is formed elastically deforms, allowing that area to absorb the impact of the fall. This makes it possible to prevent damage to the face shield 10.

[0163] The first lower curved surface 96a may be a three-dimensional curved surface. For example, the first lower curved surface 96a may be curved overall so that its vertical cross-sectional shape is convex on the side away from the wearer H at any position, or may be curved so that its horizontal cross-sectional shape is convex on the side away from the wearer H at any position.

[0164] Further, a third lower panel 93a and a fourth lower panel 94a are provided closer to the lower edge 72 (outside) than the first lower panel 91a and the second lower panel 92a, and are arranged along the extending direction of the lower edge 72 (the left-right direction in FIG. 17). In this specification, the term "outside" refers to the side away from the center of the transparent laminate film 30.

[0165] The third lower panel 93a and the fourth lower panel 94a each have an L-shape when viewed from the front. The third lower panel 93a and the fourth lower panel 94a are symmetrical with respect to a fourth lower cutout portion 104a, which will be described later.

[0166] The third lower panel 93a and the fourth lower panel 94a are separated from each other by a fourth lower cutout 104a that penetrates the transparent laminate film 30. This fourth lower cutout 104a extends from the bottom edge 72. The fourth lower cutout 104a is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The fourth lower cutout 104a is connected to the first lower cutout 101a.

[0167] The first lower panel 91a and the third lower panel 93a are separated from each other by a fifth lower cutout 105a that penetrates the transparent laminate film 30. The second lower panel 92a and the fourth lower panel 94a are separated from each other by a sixth lower cutout 106a that penetrates the transparent laminate film 30. The fifth lower cutout 105a and the sixth lower cutout 106a are each formed along the extension direction of the bottom side 72 (the left-right direction in FIG. 17). The fifth lower cutout 105a and the sixth lower cutout 106a are connected to each other and to the first lower cutout 101a and the fourth lower cutout 104a, respectively.

[0168] The first lower panel 91a and the third lower panel 93a are separated from each other by a seventh lower cutout 107a that penetrates the transparent laminate film 30. The seventh lower cutout 107a is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The seventh lower cutout 107a is connected to the fifth lower cutout 105a.

[0169] Furthermore, the second lower panel 92a and the fourth lower panel 94a are separated from each other by an eighth lower cutout 108a that penetrates the transparent laminate film 30. This eighth lower cutout 108a is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The eighth lower cutout 108a is connected to the sixth lower cutout 106a.

[0170] Then, by fixing the third lower panel 93a and the fourth lower panel 94a to the lower fixing panel 95a in a state where they are overlapped with each other, a second lower curved surface 97a that curves convexly away from the wearer H is formed on the outside of the first lower curved surface 96a. As a result, droplets that are scattered downward adhere to the first lower curved surface 96a and the second lower curved surface 97a. This makes it possible to more effectively prevent droplets from falling below the face shield 10. As a result, it is possible to more effectively prevent droplets that are scattered downward from adhering to surrounding structures.

[0171] The second lower curved surface 97a may be a three-dimensional curved surface. For example, the second lower curved surface 97a may be curved overall so that its vertical cross-sectional shape is convex on the side away from the wearer H at any position, or may be curved so that its horizontal cross-sectional shape is convex on the side away from the wearer H at any position.

[0172] In this embodiment, the first lower panel 91a, the second lower panel 92a, the third lower panel 93a, and the fourth lower panel 94a may be fixed to the lower fixing panel 95a via fixing members 100a. In this case, the fixing members 100a may be, for example, staples. Alternatively, the fixing members 100a may be adhesive, tape, clips, or the like.

[0173] 13 to 17, a first upper panel 91b and a second upper panel 92b are provided near the upper side 71 and are arranged along the extension direction of the upper side 71 (the left-right direction in FIG. 17). An upper fixing panel 95b that fixes the first upper panel 91b and the second upper panel 92b is provided closer to the lower side 72 than the first upper panel 91b and the second upper panel 92b.

[0174] The first upper panel 91b and the second upper panel 92b each have a pentagonal shape with one corner of a rectangle cut out when viewed from the front. Specifically, the first upper panel 91b has a pentagonal shape with the lower right corner of a rectangle cut out when viewed from the front. On the other hand, the second upper panel 92b has a pentagonal shape with the lower left corner of a rectangle cut out when viewed from the front. The first upper panel 91b and the second upper panel 92b are symmetrical with respect to the first upper cutout portion 101b, which will be described later. The upper fixing panel 95b has a triangular shape when viewed from the front.

[0175] The first upper panel 91b and the second upper panel 92b are separated from each other by a first upper cutout 101b that penetrates the transparent laminate film 30. This first upper cutout 101b is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17).

[0176] The first upper panel 91b and the upper fixing panel 95b are separated from each other by a second upper cutout 102b that penetrates the transparent laminate film 30. The second upper panel 92b and the upper fixing panel 95b are separated from each other by a third upper cutout 103b that penetrates the transparent laminate film 30. The second upper cutout 102b and the third upper cutout 103b are each formed along a direction that slopes in both the extension direction of the top edge 71 (the left-right direction in FIG. 17) and the extension direction of the side edge 73 (the up-down direction in FIG. 17). The third upper cutout 103b and the fourth upper cutout 104b are connected to each other and to the first upper cutout 101b.

[0177] Then, by fixing the first upper panel 91b and the second upper panel 92b to the upper fixing panel 95b in a state where they are overlapped with each other, a first upper curved surface 96b (see FIGS. 12, 13, 15, and 16) that curves convexly away from the wearer H is formed near the upper edge 71. As a result, droplets that are scattered upward adhere to the first upper curved surface 96b. This makes it possible to prevent droplets from scattering from above the face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures. Furthermore, by forming the first upper curved surface 96b near the upper edge 71, the head of the wearer H can also be covered by the first upper curved surface 96b, thereby effectively protecting the wearer H from droplets scattered from outside.

[0178] The first upper curved surface 96b may be a three-dimensional curved surface. For example, the first upper curved surface 96b may be curved as a whole so that its vertical cross-sectional shape is convex on the side away from the wearer H at any position, or may be curved so that its horizontal cross-sectional shape is convex on the side away from the wearer H at any position.

[0179] In addition, a third upper panel 93b and a fourth upper panel 94b are provided closer to the upper edge 71 (outside) than the first upper panel 91b and the second upper panel 92b, and are arranged along the extension direction of the upper edge 71 (left and right direction in Figure 17).

[0180] The third upper panel 93b and the fourth upper panel 94b each have an L-shape when viewed from the front. The third upper panel 93b and the fourth upper panel 94b are symmetrical with respect to a fourth upper cutout portion 104b, which will be described later.

[0181] The third upper panel 93b and the fourth upper panel 94b are separated from each other by a fourth upper cutout 104b that penetrates the transparent laminate film 30. This fourth upper cutout 104b extends from the upper edge 71. The fourth upper cutout 104b is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The fourth upper cutout 104b is connected to the first upper cutout 101b.

[0182] The first upper panel 91b and the third upper panel 93b are separated from each other by a fifth upper cutout 105b that penetrates the transparent laminate film 30. The second upper panel 92b and the fourth upper panel 94b are separated from each other by a sixth upper cutout 106b that penetrates the transparent laminate film 30. The fifth upper cutout 105b and the sixth upper cutout 106b are each formed along the extension direction of the top side 71 (the left-right direction in FIG. 17). The fifth upper cutout 105b and the sixth upper cutout 106b are connected to each other and to the first upper cutout 101b and the fourth upper cutout 104b, respectively.

[0183] The first upper panel 91b and the third upper panel 93b are separated from each other by a seventh upper cutout 107b that penetrates the transparent laminate film 30. The seventh upper cutout 107b is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The seventh upper cutout 107b is connected to the fifth upper cutout 105b.

[0184] Furthermore, the second upper panel 92b and the fourth upper panel 94b are separated from each other by an eighth upper cutout 108b that penetrates the transparent laminate film 30. This eighth upper cutout 108b is formed along the extension direction of the side edge 73 (the up-and-down direction in FIG. 17). The eighth upper cutout 108b is connected to the sixth upper cutout 106b.

[0185] Then, by fixing the third upper panel 93b and the fourth upper panel 94b to the upper fixing panel 95b in a state where they are overlapped with each other, a second upper curved surface 97b that curves convexly away from the wearer H is formed on the outer side of the first upper curved surface 96b. As a result, droplets that splash upward adhere to the first upper curved surface 96b and the second upper curved surface 97b. This prevents droplets from scattering from above the face shield 10 to the surrounding area. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures. Furthermore, by forming the second upper curved surface 97b near the upper edge 71, the second upper curved surface 97b can also cover the head of the wearer H, thereby effectively protecting the wearer H from splashes from outside.

[0186] The second upper curved surface 97b may be a three-dimensional curved surface. For example, the second upper curved surface 97b may be curved overall so that its vertical cross-sectional shape is convex on the side away from the wearer H at any position, or may be curved so that its horizontal cross-sectional shape is convex on the side away from the wearer H at any position.

[0187] By fixing the first lower panel 91a and the second lower panel 92a to the lower fixing panel 95a and fixing the first upper panel 91b and the second upper panel 92b to the upper fixing panel 95b, an intermediate curved surface 98 that curves convexly away from the wearer H is formed between the first lower curved surface 96a and the first upper curved surface 96b. As a result, droplets that are scattered in a direction facing the wearer and in the left and right directions as seen from the wearer adhere to the intermediate curved surface 98. This makes it possible to prevent droplets from scattering from the sides of the face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures.

[0188] As shown in Fig. 16, the curved middle surface 98 has a linear shape in vertical cross section. This prevents the size of the face shield 10 (particularly the size in the front-to-back direction) from becoming too large. This prevents the transparent laminate film 30 constituting the shield part 30A from coming into contact with surrounding structures or other people when the wearer H moves their head, for example. Furthermore, because the size of the face shield 10 can be prevented from becoming too large, the wearer H can concentrate on their work without feeling stressed even when wearing the face shield 10.

[0189] The intermediate curved surface 98 may be a two-dimensional curved surface. For example, the vertical cross-sectional shape of the intermediate curved surface 98 may be a straight line at any position, and the horizontal cross-sectional shape of the intermediate curved surface 98 may be curved so as to be convex on the side away from the wearer H at any position.

[0190] In this embodiment, the first upper panel 91b, the second upper panel 92b, the third upper panel 93b, and the fourth upper panel 94b may be fixed to the upper fixing panel 95b via fixing members 100b. In this case, the fixing members 100b may be, for example, staples. Alternatively, the fixing members 100b may be adhesive, tape, clips, or the like.

[0191] Furthermore, in this embodiment, "viewed from the front" means that the face shield 10 is viewed from the normal direction of the intermediate curved surface 98, that is, from the normal direction of the horizontal center portion 99 (see FIG. 13) of the intermediate curved surface 98, when the wearer H is wearing the face shield 10 so that the portion of the pair of temple portions 21 that is located forward of the ear hook portions 22 is horizontal and the second protrusion portion 27 is in contact with the upper end of the second opening 82 described below (the state shown in FIG. 2).

[0192] Also in this embodiment, for example, by changing the first opening 81 into which the first protrusion 26 is inserted, the front and rear positions of the shield part 30A can be adjusted.

[0193] Furthermore, in this embodiment, the opening 80 is formed in the region where the intermediate curved surface 98 is formed. As described above, the intermediate curved surface 98 is curved so as to be convex on the side away from the wearer H. Therefore, by inserting the pair of attachment portions 25 into the opening 80 from the back surface (the surface facing the wearer H) of the transparent laminate film 30, the above-mentioned holding member 20 can easily hold the transparent laminate film 30.

[0194] As described above, according to the present embodiment, a first lower panel 91a and a second lower panel 92a are provided near the bottom edge 72 and are arranged along the extension direction of the bottom edge 72. A lower fixing panel 95a that fixes the first lower panel 91a and the second lower panel 92a is provided closer to the top edge 71 than the first lower panel 91a and the second lower panel 92a. The first lower panel 91a and the second lower panel 92a are separated from each other by a first lower cutout 101a that penetrates the transparent laminate film 30. The first lower panel 91a and the lower fixing panel 95a are separated from each other by a second lower cutout 102a that penetrates the transparent laminate film 30. The second lower panel 92a and the lower fixing panel 95a are separated from each other by a third lower cutout 103a that penetrates the transparent laminate film 30. Then, by fixing the first lower panel 91a and the second lower panel 92a to the lower fixing panel 95a in a state where they are overlapped with each other, a first lower curved surface 96a that is curved so as to be convex on the side away from the wearer H is formed near the lower edge 72. As a result, droplets that are scattered downward adhere to the first lower curved surface 96a. This makes it possible to prevent droplets from falling below the face shield 10. As a result, it is possible to prevent droplets that are scattered downward from adhering to surrounding structures.

[0195] Furthermore, because the first lower curved surface 96a is curved so as to be convex on the side away from the wearer H, the area where the first lower curved surface 96a is formed is prone to elastic deformation when an impact is applied to that area. Therefore, even if the face shield 10 is dropped, the area where the first lower curved surface 96a is formed elastically deforms, allowing that area to absorb the impact of the fall. This makes it possible to prevent damage to the face shield 10.

[0196] Furthermore, according to the present embodiment, a third lower panel 93a and a fourth lower panel 94a are provided closer to the bottom edge 72 than the first lower panel 91a and the second lower panel 92a, and are arranged along the extension direction of the bottom edge 72. The third lower panel 93a and the fourth lower panel 94a are separated from each other by a fourth lower cut portion 104a that penetrates the transparent laminate film 30. The first lower panel 91a and the third lower panel 93a are separated from each other by a fifth lower cut portion 105a that penetrates the transparent laminate film 30. The second lower panel 92a and the fourth lower panel 94a are separated from each other by a sixth lower cut portion 106a that penetrates the transparent laminate film 30. Then, by fixing the third lower panel 93a and the fourth lower panel 94a to the lower fixing panel 95a in a state where they are overlapped with each other, a second lower curved surface 97a is formed on the outside of the first lower curved surface 96a, which curves convexly on the side away from the wearer H. As a result, droplets that are scattered downward adhere to the first lower curved surface 96a and the second lower curved surface 97a. This makes it possible to more effectively prevent droplets from falling below the face shield 10. As a result, it is possible to more effectively prevent droplets that are scattered downward from adhering to surrounding structures.

[0197] Furthermore, according to the present embodiment, the fourth lower cutout 104a extends from the lower edge 72. This increases the curvature of the second lower curved surface 97a formed by the third lower panel 93a and the fourth lower panel 94a. This makes it easier for the second lower curved surface 97a to cover the chin of the wearer H from below. As a result, droplets can be more effectively prevented from falling below the face shield 10. This makes it more effective to prevent droplets that are scattered downward from adhering to surrounding structures.

[0198] According to the present embodiment, a first upper panel 91b and a second upper panel 92b are provided near the upper side 71 and arranged along the extension direction of the upper side 71. An upper fixing panel 95b that fixes the first upper panel 91b and the second upper panel 92b is provided closer to the lower side 72 than the first upper panel 91b and the second upper panel 92b. The first upper panel 91b and the second upper panel 92b are separated from each other by a first upper cut portion 101b that penetrates the transparent laminate film 30. The first upper panel 91b and the upper fixing panel 95b are separated from each other by a second upper cut portion 102b that penetrates the transparent laminate film 30. The second upper panel 92b and the upper fixing panel 95b are separated from each other by a third upper cut portion 103b that penetrates the transparent laminate film 30. Then, by fixing the first upper panel 91b and the second upper panel 92b to the upper fixing panel 95b in a state where they are overlapped with each other, a first upper curved surface 96b that curves convexly away from the wearer H is formed near the upper edge 71. As a result, droplets that splash upward adhere to the first upper curved surface 96b. This makes it possible to prevent droplets from splashing from above the face shield 10 to the surroundings. As a result, it is possible to prevent splashed droplets from adhering to surrounding structures. Furthermore, by forming the first upper curved surface 96b near the upper edge 71, the head of the wearer H can also be covered by the first upper curved surface 96b, thereby effectively protecting the wearer H from splashes that splash from outside.

[0199] Furthermore, according to the present embodiment, a third upper panel 93b and a fourth upper panel 94b are provided closer to the top edge 71 than the first upper panel 91b and the second upper panel 92b, and are arranged along the extension direction of the top edge 71. The third upper panel 93b and the fourth upper panel 94b are separated from each other by a fourth upper cut portion 104b that penetrates the transparent laminate film 30. The first upper panel 91b and the third upper panel 93b are separated from each other by a fifth upper cut portion 105b that penetrates the transparent laminate film 30. The second upper panel 92b and the fourth upper panel 94b are separated from each other by a sixth upper cut portion 106b that penetrates the transparent laminate film 30. Then, by fixing the third upper panel 93b and the fourth upper panel 94b to the upper fixing panel 95b in a state where they are overlapped with each other, a second upper curved surface 97b that curves convexly away from the wearer H is formed on the outer side of the first upper curved surface 96b. As a result, droplets that splash upward adhere to the first upper curved surface 96b and the second upper curved surface 97b. This makes it possible to more effectively prevent droplets from splashing upward to the surroundings from above the face shield 10. As a result, it is possible to more effectively prevent droplets that splash upward from adhering to surrounding structures. Furthermore, by forming the second upper curved surface 97b near the upper edge 71, the second upper curved surface 97b can also cover the head of the wearer H, thereby effectively protecting the wearer H from splashes flying from outside.

[0200] Furthermore, according to this embodiment, the fourth upper cutout 104b extends from the upper edge 71. This allows the curvature of the second upper curved surface 97b formed by the third upper panel 93b and the fourth upper panel 94b to be increased. This makes it easier for the second upper curved surface 97b to cover the head of the wearer H from above. As a result, splashes of droplets from above the face shield 10 can be more effectively prevented from being scattered into the surrounding area. This makes it more effective to prevent splashes scattered upward from adhering to surrounding structures. In addition, the wearer H can be more effectively protected from splashes scattered from outside.

[0201] Furthermore, according to the present embodiment, by fixing the first lower panel 91a and the second lower panel 92a to the lower fixing panel 95a and fixing the first upper panel 91b and the second upper panel 92b to the upper fixing panel 95b, an intermediate curved surface 98 that curves convexly away from the wearer H is formed between the first lower curved surface 96a and the first upper curved surface 96b. As a result, droplets that are scattered in the direction facing the wearer H and in the left and right directions as viewed from the wearer H adhere to the intermediate curved surface 98. This makes it possible to prevent droplets from scattering from the sides of the face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures.

[0202] Furthermore, according to this embodiment, the curved intermediate surface 98 has a linear shape in vertical cross section. This prevents the face shield 10 from becoming too large. This prevents the transparent laminate film 30 constituting the shield portion 30A from coming into contact with surrounding structures or other people when the wearer H moves their head, for example. Furthermore, because the size of the face shield 10 can be prevented from becoming too large, the wearer H can concentrate on their work without feeling stressed even when wearing the face shield 10.

[0203] < Third embodiment > Next, a third embodiment will be described with reference to Figures 18 to 23. The third embodiment shown in Figures 18 to 23 differs from the second embodiment mainly in the configuration of the shielding section (transparent laminate film). In Figures 18 to 23, the same parts as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0204] As shown in Figures 18 to 23, in this embodiment as well, the transparent laminate film 30 constituting the shield portion 30A has a rectangular shape (see Figure 23) having an upper edge 71, a lower edge 72 opposite to the upper edge 71, and a pair of side edges 73 extending between the upper edge 71 and the lower edge 72.

[0205] As shown in Figures 19 to 23, the shield portion 30A (transparent laminate film 30) is formed with a pair of first mountain folds 121b extending from the upper edge 71 and a pair of first valley folds 122b extending from the upper edge 71 and disposed between the pair of first mountain folds 121b.

[0206] In addition, the shield portion 30A (transparent laminate film 30) is formed with a pair of second mountain folds 121a extending from the lower side 72, and a pair of second valley folds 122a extending from the lower side 72 and provided between the pair of second mountain folds 121a.

[0207] The pair of first mountain folds 121b and the pair of second mountain folds 121a each extend in the direction in which the side edge 73 extends (the up-and-down direction in FIG. 23). The pair of first valley folds 122b extend in a direction inclined toward the direction in which the side edge 73 extends so as to move away from each other from the upper edge 71 toward the lower edge 72. The pair of second valley folds 122a extend in a direction inclined toward the direction in which the side edge 73 extends so as to move away from each other from the lower edge 72 toward the upper edge 71.

[0208] Then, the transparent laminate film 30 may be folded along the pair of first mountain folds 121b and the pair of first valley folds 122b to form a front surface 150 and an upper surface 151 that is provided above the front surface 150 and folded rearward from the front surface 150 (see FIGS. 18, 19, 21, and 22). As a result, droplets that are scattered upward adhere to the upper surface 151. This makes it possible to prevent droplets from scattering from above the face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures. Furthermore, by forming the upper surface 151, the head of the wearer H can also be covered by the upper surface 151, thereby effectively protecting the wearer H from droplets scattering from the outside (above).

[0209] Furthermore, the transparent laminate film 30 may be folded along the pair of second mountain folds 121a and the pair of second valley folds 122a to form a front surface 150 and a lower surface 152 that is provided below the front surface 150 and folded rearward from the front surface 150 (see FIGS. 18, 19, 20, and 22). This causes droplets that splash downward to adhere to the lower surface 152. This prevents droplets from falling below the face shield 10. As a result, it is possible to prevent droplets that splash downward from adhering to surrounding structures.

[0210] Furthermore, by folding the transparent laminate film 30 along the pair of first mountain folds 121b and the pair of first valley folds 122b, and also along the pair of second mountain folds 121a and the pair of second valley folds 122a, side surfaces 153 that extend rearward from the front surface 150 are formed on the sides of the front surface 150. As a result, droplets that are scattered in the direction facing the wearer H and in the left-right directions as viewed from the wearer H adhere to the side surfaces 153. This prevents droplets from scattering from the sides of the face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures.

[0211] In this embodiment, the front surface 150 has a rectangular shape when viewed from the front. Alternatively, the front surface 150 may be a flat surface.

[0212] In a side view, the upper surface 151 and the lower surface 152 are folded so as to be perpendicular to the front surface 150. The upper surface 151 and the lower surface 152 may each be a flat surface.

[0213] The side surface 153 is connected to the front surface 150, the upper surface 151, and the lower surface 152. Of the side surface 153, the portions near the upper surface 151 and the lower surface 152 may be three-dimensional curved surfaces, and the other portions may be two-dimensional curved surfaces.

[0214] In the present embodiment, the transparent laminate film 30 may be fixed by, for example, a fixing member (not shown) when folded along the pair of first mountain folds 121b, etc. The fixing member may be, for example, a staple, adhesive, tape, or a clip.

[0215] Furthermore, in this embodiment, "viewed from the front" means that the face shield 10 is viewed from the normal direction of the central portion 150a of the front surface 150 (see Figure 19) in a state where the wearer H is wearing the face shield 10 so that the portion of the pair of temple portions 21 that is located forward of the ear hook portions 22 is horizontal, and the second protrusion portion 27 is abutting the upper end of the second opening 82 described below.

[0216] Also in this embodiment, for example, by changing the first opening 81 into which the first protrusion 26 is inserted, the front and rear positions of the shield part 30A (transparent laminate film 30) can be adjusted.

[0217] Furthermore, in this embodiment, the opening 80 is formed in an area where the side surface 153 is formed. As described above, the side surface 153 extends rearward from the front surface 150. Therefore, by inserting the pair of attachment portions 25 into the opening 80 from the rear surface (the surface on the wearer H side) of the transparent laminate film 30, the holding member 20 can easily hold the transparent laminate film 30.

[0218] As described above, according to the present embodiment, the transparent laminate film 30 is formed with a pair of first mountain folds 121b extending from the upper edge 71 and a pair of first valley folds 122b extending from the upper edge 71 and provided between the pair of first mountain folds 121b. The pair of first mountain folds 121b extend along the direction in which the side edges 73 extend. The pair of first valley folds 122b extend in a direction inclined toward the direction in which the side edges 73 extend so as to become more spaced apart from each other as they move from the upper edge 71 toward the lower edge 72. The transparent laminate film 30 is folded along the pair of first mountain folds 121b and the pair of first valley folds 122b to form the front surface 150 and the upper surface 151 provided above the front surface 150 and folded backward from the front surface 150. As a result, droplets scattered upward adhere to the upper surface 151. This prevents droplets from scattering from above the face shield 10. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures. Furthermore, by forming the upper surface 151, the head of the wearer H can also be covered by the upper surface 151, and the wearer H can be effectively protected from droplets scattering from the outside (above).

[0219] Furthermore, according to the present embodiment, the transparent laminate film 30 is formed with a pair of second mountain folds 121a extending from the lower side 72 and a pair of second valley folds 122a extending from the lower side 72 and provided between the pair of second mountain folds 121a. The pair of second mountain folds 121a extend along the extension direction of the side sides 73. The pair of second valley folds 122a extend along a direction inclined toward the extension direction of the side sides 73 so as to become more spaced apart from each other as they move from the lower side 72 toward the upper side 71. The transparent laminate film 30 is folded along the pair of second mountain folds 121a and the pair of second valley folds 122a to form a front surface 150 and a lower surface 152 provided below the front surface 150 and folded backward from the front surface 150. As a result, droplets scattered downward adhere to the lower surface 152. This can prevent droplets from falling below the face shield 10. As a result, it is possible to prevent droplets scattered downward from adhering to surrounding structures.

[0220] Furthermore, according to the present embodiment, transparent laminate film 30 is folded along a pair of first mountain folds 121b and a pair of first valley folds 122b, and also along a pair of second mountain folds 121a and a pair of second valley folds 122a, thereby forming side surfaces 153 extending rearward from front surface 150 on the sides of front surface 150. As a result, droplets scattered in the direction facing wearer H and in the left-right directions as viewed from wearer H adhere to side surfaces 153. This prevents droplets from scattering from the sides of face shield 10 to the surroundings. As a result, it is possible to prevent scattered droplets from adhering to surrounding structures. [Example]

[0221] Next, a specific example of the above embodiment will be described.

[0222] Example 1 First, the face shield 10 shown in Fig. 12 was produced. The holding member 20 was made from an aluminum round bar. The diameter of the round bar was 2 mm. In addition, when viewed from the front, the ratio (A2 / A1) of the area A2 of the holding member 20 to the area A1 of the shield portion 30A (transparent laminate film 30) was 0.1%.

[0223] (1) Visibility evaluation test Next, a visibility evaluation test of the face shield 10 was conducted.

[0224] First, the face shield 10 was placed on the head of a doll. At this time, in a typical indoor environment illuminated by fluorescent lights, the holding member 20 of the face shield 10 was observed from a distance of about 1 m to 2 m from the doll. Then, the degree to which the holding member 20 was recognized was evaluated.

[0225] (2) Tightening evaluation test In addition, a test to evaluate the fastening ability of the face shield 10 was conducted.

[0226] First, 10 experimenters were randomly selected. Then, the distance between the experimenters' temples was measured and the average value was calculated. The average value was approximately 130 mm. Next, the force required to spread the temple portions 21 apart from each other was measured so that the distance between the tips of the temple portions 21 was 130 mm. For the measurement, a tensile tester (manufactured by A&D Co., Ltd., MCT-2150 (product name)) was used. The experimenters were also asked to wear the face shield 10 and to ask whether they felt any tightness around their heads.

[0227] (3) Position shift prevention evaluation test In addition, a test to evaluate the ability of the face shield 10 to prevent displacement was conducted.

[0228] At this time, the face shield 10 was attached to the head of the doll. Then, the horizontal distance from the mouth of the doll to the shield part 30A was measured. In addition, the face shield 10 was attached to and detached from the doll 20 times, and the difference between the maximum and minimum values of the horizontal distance was calculated.

[0229] Example 2 A visibility evaluation test, a fastening performance evaluation test, and a displacement prevention evaluation test were conducted in the same manner as in Example 1, except that the holding member shown in FIG. 10 was prepared, the holding member 20 was prepared from a round rod of acrylic resin, and the diameter of the round rod was 3 mm.

[0230] (Comparative Example 1) A visibility evaluation test, a fastening ability evaluation test, and a displacement prevention evaluation test were conducted in the same manner as in Example 1, except that a commercially available face shield (YF-850L (product name) manufactured by Yamamoto Kogaku Co., Ltd.) was used. Here, in Comparative Example 1, in the fastening ability evaluation test, the width of the temporal bone above the ear of the experimenter was measured and the average value was calculated. The average value was approximately 130 mm. Next, the force required to spread the holding members of the face shield so that the distance between the portions corresponding to the temporal bones was 130 mm was measured.

[0231] (Comparative Example 2) The visibility evaluation test, the fastening ability evaluation test, and the anti-slippage evaluation test were conducted in the same manner as in Comparative Example 1, except that a commercially available face shield (FG-F10M (product name) manufactured by Sharp Corporation) was used.

[0232] (Comparative Example 3) The visibility evaluation test, the fastening ability evaluation test, and the anti-slippage evaluation test were conducted in the same manner as in Example 1, except that a commercially available face shield (HIRAX AIR SHIELD (product name) manufactured by Hiraoka Kogyo Co., Ltd.) was used.

[0233] Comparative Example 4 The visibility evaluation test, the fastening evaluation test, and the anti-slip evaluation test were conducted in the same manner as in Example 1, except that a commercially available face shield (manufactured by Miyamoto Co., Ltd., Halo (product name)) was used.

[0234] The results are shown in Table 1.

[0235] [Table 1]

[0236] In the visibility column of Table 1 above, "○" means that the holding member was inconspicuous and did not give the impression of wearing a face shield, while "×" means that the holding member was noticeable.

[0237] In the column for tightness in Table 1 above, "○" means that the interview result indicated that the head did not feel tight, and "×" means that the head felt tight.

[0238] As a result, as shown in Table 1, in the visibility evaluation test, the hearing results indicated that the retaining members were noticeable in the face shields according to Comparative Examples 1 to 3. On the other hand, in Examples 1 and 2, the hearing results indicated that the retaining members were not noticeable and there was no impression that the face shield 10 was being worn. In this way, the face shields 10 according to Examples 1 and 2 were able to reduce the feeling of wearing the face shield 10.

[0239] Furthermore, as shown in Table 1, in the tightening evaluation test, for the face shields according to Comparative Examples 1 to 4, a force of 2.0 N or more was required to spread the temple portions apart so that the distance between the tips of the temple portions was 130 mm. In contrast, for the face shields 10 according to Examples 1 and 2, this force was 0.1 N. Furthermore, the results of interviews indicated that the face shields according to Comparative Examples 2 to 4 felt like they were tightening the head. On the other hand, the results of interviews indicated that the face shields 10 according to Examples 1 and 2 did not feel like they were tightening the head. Thus, with the face shields 10 according to Examples 1 and 2, it was possible to prevent the pair of temple portions 21 from tightening the head of the experimenter.

[0240] Furthermore, as shown in Table 1, in the positional displacement prevention evaluation test, the difference between the maximum and minimum horizontal distances from the doll's mouth to the shield portion for the face shields of Comparative Examples 2 to 4 was 25 mm or more. When the difference between the maximum and minimum values is large, the effectiveness of the face shield in blocking the wearer's mouth and nose from others may vary, even when the face shield is worn by the wearer. This may result in instability in preventing the spread of droplets from the wearer's mouth or nose. Furthermore, in some cases, the spread prevention function may be impaired. On the other hand, for the face shields 10 of Examples 1 and 2, the difference between the maximum and minimum horizontal distances from the doll's mouth to the shield portion 30A was 10 mm. Thus, the face shields 10 of Examples 1 and 2 were able to prevent the face shields 10 from shifting position, even when the face shields 10 were repeatedly worn and removed. This demonstrates that the face shields 10 of Examples 1 and 2 can enhance the above-mentioned spread prevention function.

[0241] The components disclosed in the above embodiments and modifications may be combined as needed, or some components may be omitted from all the components disclosed in the above embodiments and modifications. [Explanation of symbols]

[0242] 10. Face shields 20 Retaining member 21 Temple 22 Ear hook 23 Connecting part 24 weight 25 Mounting part 30 Transparent laminated film 80 Opening E ear H wearer F face

Claims

1. In a face shield that protects the wearer's face, a holding member attached to the wearer; a transparent laminate film attached to the holding member and covering at least a part of the face of the wearer, The holding member is a pair of temples including ear hooks to be worn on the wearer's ears; a connecting portion that connects the pair of temple portions to each other from behind the wearer, No other members are disposed in front of the wearer, except for the transparent laminate film, and extending between the pair of temple portions, The pair of temple portions have a portion located forward of the ear hook portion that does not come into contact with the wearer's head, The holding member is made of a round bar, A face shield, wherein the transparent laminate film is directly attached to the round rod.

2. 2. The face shield according to claim 1, wherein the pair of temple portions extend parallel to each other forward of the ear hook portion, or extend such that the distance between the pair of temple portions increases toward the front.

3. 3. The face shield according to claim 1, wherein a force required to spread the temple portions in directions away from each other so that the distance between the tips of the temple portions is 130 mm is equal to or greater than 0.01 N and equal to or less than 3.0 N.

4. The face shield according to claim 1 , wherein a weight is attached to the connecting portion to adjust the inclination of the temple portion relative to the horizontal direction.

5. A face shield for protecting the wearer's face, a holding member attached to the wearer; a transparent laminate film attached to the holding member and covering at least a part of the face of the wearer, The holding member is a pair of temples including ear hooks to be worn on the wearer's ears; a connecting portion that connects the pair of temple portions to each other from behind the wearer, No other members are disposed in front of the wearer, except for the transparent laminate film, and extending between the pair of temple portions, The pair of temple portions have a portion located forward of the ear hook portion that does not come into contact with the wearer's head, A face shield, wherein a weight is attached to the connecting portion to adjust the inclination of the temple portion relative to the horizontal direction.

6. The face shield according to claim 1 , wherein the temple portions and the connecting portion are integrally molded.

7. The face shield according to claim 1 , wherein the connecting portion is provided separately from the temple portion and adjusts the inclination of the temple portion relative to the horizontal direction.

8. A face shield for protecting the wearer's face, a holding member attached to the wearer; a transparent laminate film attached to the holding member and covering at least a part of the face of the wearer, The holding member is a pair of temples including ear hooks to be worn on the wearer's ears; a connecting portion that connects the pair of temple portions to each other from behind the wearer, No other members are disposed in front of the wearer, except for the transparent laminate film, and extending between the pair of temple portions, The pair of temple portions have a portion located forward of the ear hook portion that does not come into contact with the wearer's head, The connecting portion is provided separately from the temple portion and adjusts the inclination of the temple portion relative to the horizontal direction.

9. The face shield according to claim 1 , wherein the holding member is a rod-shaped member made of metal.

10. 10. The face shield of claim 9, wherein the metal is aluminum.

11. The face shield according to claim 1 , wherein the holding member is a rod-shaped member made of resin.

12. The face shield according to claim 11, wherein the resin is selected from the group consisting of polyethylene terephthalate, polycarbonate, and acrylic resin.

13. The temple portion is provided in front of the ear hook portion and includes a pair of attachment portions for holding the transparent laminate film, The face shield according to claim 1 , wherein the transparent laminate film has an opening through which the attachment portion is inserted.

14. A face shield for protecting the wearer's face, a holding member attached to the wearer; a transparent laminate film attached to the holding member and covering at least a part of the face of the wearer, The holding member is a pair of temples including ear hooks to be worn on the wearer's ears; a connecting portion that connects the pair of temple portions to each other from behind the wearer, No other members are disposed in front of the wearer, except for the transparent laminate film, and extending between the pair of temple portions, The pair of temple portions have a portion located forward of the ear hook portion that does not come into contact with the wearer's head, The temple portion is provided in front of the ear hook portion and includes a pair of attachment portions for holding the transparent laminate film, A face shield, wherein the transparent laminate film has an opening through which the attachment portion is inserted.

15. The face shield according to claim 1 , wherein the holding member holds the transparent laminate film so as to be movable in the up and down direction.

16. A face shield for protecting the wearer's face, a holding member attached to the wearer; a transparent laminate film attached to the holding member and covering at least a part of the face of the wearer, The holding member is a pair of temples including ear hooks to be worn on the wearer's ears; a connecting portion that connects the pair of temple portions to each other from behind the wearer, No other members are disposed in front of the wearer, except for the transparent laminate film, and extending between the pair of temple portions, The pair of temple portions have a portion located forward of the ear hook portion that does not come into contact with the wearer's head, The holding member holds the transparent laminate film so that the transparent laminate film can move in the vertical direction.

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