KR102350569B1 - Antifog photochromic shield - Google Patents

Abstract

Disclosed is a shield which is rotationally coupled to a helmet body surrounding a user's head to open and close an opening provided in the helmet body, and to which a light-shielding film containing a photochromic dye is attached.

Description

Anti-fog discoloration shield {ANTIFOG PHOTOCHROMIC SHIELD}

The present invention relates to an anti-fog discoloration shield, and more particularly, to a helmet shield including an anti-fog anti-fog discoloration film.

The helmet is required to be worn while driving a two-wheeled vehicle such as a motorcycle, and an openable and openable shield is located in the opening in the front of the helmet body formed to secure the driver's forward visibility.

Due to the nature of the helmet having a closed structure in which the inside is not well ventilated from the outside, the wearer feels stuffy, and there is a problem in that the inside of the shield is moistened according to the wearer's breathing and blocks the view. Accordingly, in order to solve the problem of moisture build up inside the shield, a film that is attached to the shield to prevent moisture has been provided attached to the inside of the shield.

On the other hand, a method of attaching a colored film that blocks a part of the helmet shield or vacuum-depositing a metal component on the surface is generally used.

However, according to these methods, a certain percentage of visible light is always blocked regardless of the amount of light, so there is a disadvantage in that the view becomes dark at night or on a cloudy day.

One aspect of the present invention discloses a shield comprising an anti-fog anti-fog discoloration film.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The shield according to an embodiment of the present invention is rotatably coupled to a helmet body surrounding a user's head to open and close an opening provided in the helmet body, and a light blocking film including a photochromic dye is attached thereto.

On the other hand, the light-shielding film, an infrared blocking layer formed on the upper portion of the transparent substrate; an adhesive layer formed on the infrared blocking layer; and a protective layer formed on the adhesive layer;

In the infrared blocking layer, a photochromic dye may be dispersed in an outermost layer in an incident direction of external light.

In addition, the light-shielding film may include an infrared blocking layer formed on the transparent substrate; a photochromic dye dispersed in the infrared blocking layer; an adhesive layer formed on the infrared blocking layer; and a protective layer formed on the adhesive layer;

The infrared blocking layer may include a first cholesteric layer that reflects the incident first polarized light while transmitting the second polarized light, and a second cholesteric layer that reflects the second polarized light.

In addition, the lock fitting hole formed through both sides; a pin lock device fastened to the lock fitting hole to fasten the shield to the helmet body; a moisture-preventing film fitted and fastened between the pin lock devices; and a shield protection film to which the light-shielding film is attached and fastened to the pin lock device.

In addition, a plurality of photochromic dyes having different visible light absorption wavelength bands may be mixed with the photochromic dye.

According to the present invention described above, it is possible to easily mount or replace the moisture-preventing film or shield protective film mounted on the inside and outside of the shield, while blocking visible light during the daytime, and external visibility in case of cloudy weather or at night can be sufficiently obtained.

1 and 2 are perspective views of a helmet according to an embodiment of the present invention.
3 is an exploded perspective view of a shield, a pin lock device, a moisture prevention film, and a shield protection film according to an embodiment of the present invention.
4 is a view showing a state in which a lock pin is fastened to a lock base with a shield interposed therebetween. FIG. 5 is a state in which the lock pin is custom-fitted to the center of the lock base (center position), and FIG. 6 is a lock to the eccentric position of the lock base. It shows how the pins are custom-fastened (eccentric position).
7 is a view illustrating a state in which the lock base is coupled to the lock pin with the shield interposed therebetween.
8 and 9 are views illustrating a case in which the lock base fastened with the lock pin through the lock fitting hole rotates around the eccentrically located base protrusion. 9 shows a state in which the center of the base projection is located inside the center of the lock base.
10 and 11 are cross-sectional views showing a state before the lock pin is fastened to the lock base, FIG. 10 is a state in which the lock pin is fitted and fastened to the center of the lock base (center position), and FIG. 11 is the lock pin to the eccentric position of the lock base This custom fastening mode (eccentric position) is shown.
12 is a cross-sectional view showing a state immediately after the lock pin is inserted into the lock base, and a partially enlarged view of the inserted portion.
13 is a cross-sectional view illustrating a state in which a lock pin inserted into a lock base is fastened through rotation and a partially enlarged view of the fastened part;
14 and 15 are views for explaining a light blocking film according to an embodiment of the present invention.
16 and 17 are views for explaining a light blocking film according to another embodiment of the present invention.
18 is a view for explaining a light blocking film according to another embodiment of the present invention.
19 is a view for explaining a shield according to another embodiment of the present invention.
20 is a view for explaining a contact block according to an embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" refers to the stated elements, steps, and acts do not exclude the presence or addition of one or more other elements, steps and acts.

1 and 2 are perspective views of a helmet according to an embodiment of the present invention.

Referring to FIG. 1 , a helmet 100 according to an embodiment of the present invention is a type of protective equipment worn by occupants of motorcycles and racing cars while driving, and the helmet body 101 has an opening 115 formed therein. ) and a shield 102 rotatably coupled to the helmet body 101 to open and close the opening 115 .

The helmet body 101 is configured to cover the user's head to protect the user's head from floating objects or accidents while driving. In this case, an opening 115 is formed in a portion of the helmet body 101 to secure the user's view. When the direction in which the opening 115 is formed is defined as the front side of the helmet body 101 , rotation holes (not shown) are respectively formed on both sides of the helmet body 101 . The rotation hole provides a portion of the rotation means 103 by which the shield 102 can be rotatably coupled to the helmet body 101 .

The shield 102 is rotatably coupled to the helmet body 101 to open and close the opening 115 . During driving, the user closes the opening 115 with the shield 102 to protect the face so that the wind or foreign substances do not stimulate it.

Therefore, the shield 102 must be made of transparent acrylic, etc., so that sufficient visibility can be secured even when the opening 115 is closed.

At both side ends of the shield 102 , other parts of the rotation means 103 for coupling the shield 102 to the helmet body 101 are provided together with the rotation holes.

As the simplest example, rotation protrusions (not shown) corresponding to the rotation holes of the helmet body 101 may be formed on inner surfaces of both ends of the shield 102 . At this time, while the shield 102 is manufactured as a curved surface surrounding the front of the helmet body 101 , the distance between the rotation protrusions respectively formed on the inner surfaces of both ends of the helmet body 101 is between the rotation holes of the helmet body 101 . formed narrower than the distance of Therefore, when the shield 102 is coupled to the helmet body 101 at a position where the rotation protrusion is coupled to the rotation hole, the shield 102 itself elastic force is the shield 102 is the helmet body 101 . Acting as a force surrounding both sides of the rotation projection is stably coupled to the rotation hole. The rotational hole and the rotational projection are engaged with each other to provide a rotational means 103 for rotatably coupling the shield 102 to the helmet body 101 .

As another form of the rotation means 103 for coupling the shield 102 to the helmet body 101 , a rotation shaft (not shown) may be used. This allows the rotation shaft to penetrate from the rotation hole to the shield 102, and screws or the like are respectively fastened to both ends thereof to support the inner surface of the helmet body 101 and the outer surface of the shield 102, The shield 102 is rotatably coupled to the helmet body 101 and at the same time restricts the separation from the helmet body 101 .

At this time, a washer for reducing friction may be interposed between a portion where friction occurs as the shield 102 rotates, for example, between the outer surface of the helmet body 101 and the inner surface of the shield 102 . .

As described above, a configuration for simply rotatably coupling a fixed body such as the helmet body 101 and a rotating body such as the shield 102 can be easily understood by those skilled in the art.

On the other hand, as mentioned above, the conventional helmet has a gear combination as a rotation limiting means of the shield while coupling the shield. On the other hand, as in the preferred embodiment of the present invention, simply rotatably coupling the helmet body 101 and the shield 102 is a fixing device of the shield 102 to the helmet 100, and the magnetic materials 111, 113, 121, 123) are installed.

The helmet 100 includes a first magnetic body 111 installed on the outer circumferential surface of the helmet body 101 and a second magnetic body 121 installed on the shield 102 . The first magnetic body 111 and the second magnetic body 121 are configured as permanent magnets.

Accordingly, when the shield 102 opens the opening 115 to some extent to reach a distance at which the attractive force between the first magnetic body 111 and the second magnetic body 121 can act, the shield by the attractive force therebetween. 102 completely opens the opening 115 even if the user does not further open it.

In a state in which the shield 102 opens the opening 115 , the second magnetic body 121 is attached to the first magnetic body 111 . This is due to the attractive force acting between the first magnetic body 111 and the second magnetic body 121 . The second magnetic body 121 is installed in the upper central portion of the shield 102, and the first magnetic body 111 has the opening 115 to such an extent that the shield 102 can completely open the user's face. It is installed at a position where it can be attached to the second magnetic body 121 when fully opened.

Accordingly, the first magnetic body 111 is located above the opening 115 of the helmet body 101 . In a state in which the second magnetic body 121 is attached to the first magnetic body 111, even if the user moves his/her head or bows his/her head, the first and second magnetic bodies 111 and 121 are The shield 102 may maintain a stable fixed state without closing the opening 115 again.

When installing the first magnetic body 111 and the second magnetic body 121 , the number and position thereof may be variously set. Although the present embodiment shows an example in which the second magnetic body 121 is installed in the central portion between one end of the shield 102 and the other end of the shield 102, it is understood by those skilled in the art that two or more magnetic materials can be installed at a predetermined interval. If so, it will be easy to understand.

The helmet 100 may further include magnetic materials 113 and 123 for stably maintaining a state in which the shield 102 closes the opening 115 .

In order for the shield 102 to maintain the closed state of the opening 115 , a third magnetic body 113 is installed on at least one side surface of the helmet body 101 , and at one end of the shield 102 . A fourth magnetic body 123 is installed.

The third magnetic body 113 and the fourth magnetic body 123 are also made of permanent magnets.

The third magnetic body 113 is positioned adjacent to the opening 115 so that when the shield 102 completely closes the opening 115 , the fourth magnetic body 123 is attached to the third magnetic body 113 . will stick Accordingly, while the shield 102 is fixed at a predetermined position in the state in which the opening 115 is closed, it is possible to stably maintain the state in which the opening 115 is closed.

At this time, the third magnetic body 113 may be installed on both sides of the helmet body 101 , and correspondingly, the fourth magnetic body 123 may also be installed on both ends of the shield 102 . It is self-evident that

3 is a perspective view of a helmet according to another embodiment of the present invention.

As shown in FIG. 3 , the helmet 10 according to the embodiment of the present invention includes a helmet body 11 , an opening 12 , and a shield 20 that is fastened to open and close with the helmet body 11 . include

The helmet body 11 forms the body of the helmet 10 and has an internal space that can accommodate the wearer's head, and is manufactured in a closed type to fit snugly to the wearer's head shape. The helmet body 11 is formed with an opening 12 for securing a view on the front side.

The shield 20 is a transparent window that can selectively open and close the opening 12 so that the view is not obstructed by wind, rain, or snow transmitted from the front during driving. The shield 20 has inner coupling holes 21 that can be fastened to the helmet body 11 are formed on both end surfaces, and through this, the shield coupling bundle 13 formed on both sides of the helmet body 11 is fastened. .

The shield 20 may include lock fitting holes 22 that are formed through both side surfaces (refer to FIG. 3 ), through which the pin lock device 200 may be fastened. Also, inside the shield 20 , the moisture prevention film 220 may be fitted and fastened between the pin lock devices 200 respectively fastened to both sides of the shield 20 . Also, on the outside of the shield 20 , the shield protection film 240 may be engaged between the pin lock devices 200 respectively fastened to both sides of the shield 20 . The structure of the shield 20 , the pin lock device 200 , and the films 220 and 240 will be described in more detail with reference to FIGS. 4 to 6 .

4 is an exploded perspective view of the shield 20 , the pin lock device 200 , the moisture prevention film 220 , and the shield protection film 240 . 5 and 6 are views illustrating a state in which the lock pin 210 is coupled to the lock base 230 with the shield 20 interposed therebetween. . However, as shown in FIGS. 5 and 6 , the lock base 230 may be provided in various forms as long as it can be fastened to the lock pin 210 while being accommodated in the shield 20 . 7 is a view illustrating a state in which the lock base 230 is coupled to the lock pin 210 with the shield 20 interposed therebetween. The shield protective film 240 may be detachably engaged by engaging.

As shown in FIG. 4 , the shield 20 is formed through both side surfaces, and includes a lock fitting hole 22 to which the pin lock device 200 can be fastened.

The lock fitting hole 22 has a diameter sufficient to allow the pin protrusion 211 of the pin lock device 200 to be described later to pass through and accommodated in the base protrusion 231 to rotate clockwise or counterclockwise. refers to the formed hole. The lock fitting holes 22 are respectively formed on both sides of the shield 20 and may include bearings 22a (see FIGS. 5A and 5B ).

The bearing 22a is a ring-shaped member formed along the periphery of the lock fitting hole 22 , and a friction force that may be generated when the pin lock device 200 , which will be described later, rotates while being fastened to the shield 20 . It can help absorb and enable smooth rotation.

In addition, when the shield 20 is inserted into the helmet 10, when it collides with the helmet body 11, which may occur, an elastic part 29 for alleviating the impact applied to the shield 20 is included in the upper part. can To this end, the elastic part 29 may be formed of an elastic material such as rubber and fitted to the upper portion of the shield 20 .

The pin lock device 200 refers to a coupling member that is fastened through the lock fitting holes 22 formed on both sides of the shield 20 and supports the films 220 and 240 to be described later so as to be detachably attached. To this end, the pin lock device 200 may include a lock pin 210 and a lock base 230 .

The lock pin 210 is a coupling member inserted from the inside to the outside of the lock fitting hole 22 , and may include a pin protrusion 211 , a pin support plate 213 , and a pin handle part 215 .

The pin protrusion 211 refers to a protrusion that penetrates to the outside of the lock fitting hole 22 and is fitted and fastened to the lock base 230 to be described later.

The pin support plate 213 refers to a protrusion that is in close contact with the lock fitting hole 22 on the inside of the shield 20 to prevent the lock pin 210 from advancing to the outside.

The pin handle portion 215 refers to a handle of the lock pin 210 extending inwardly from the pin support plate 213 to form the head of the lock pin 210 .

Also, the lock pin 210 may further include a pin groove 217 .

The pin groove 217 is formed between the pin support plate 213 and the pin handle portion 215 , and refers to a bent portion having a cross section smaller than that of the pin support plate 213 and the pin handle portion 215 .

5 and 6 , the lock pin 210 is fastened to the lock base 230 with the shield 20 interposed therebetween, and the moisture barrier film 220 is detachably attached to the lock pin 210 . It can be fitted and fastened.

The moisture prevention film 220 refers to a film that is fastened to the inside of the shield 20 and prevents the shield 20 from becoming cloudy due to moisture generated by breathing of a wearer of the helmet 10 . The moisture barrier film 220 may include fitting grooves 227 at both ends.

The fitting groove 227 may be formed to have a wavy shape as shown in FIGS. 3A and 3B , and may be fitted and fastened to the pin groove 217 that is a bent portion formed in the lock pin 210 . .

The moisture barrier film 220 is formed by fitting and fastening the fitting grooves 227 formed at both ends with the pin grooves 217 of the lock pins 210 inserted into both sides of the shield 20, and the like. Through deformation or the like, it is possible to fasten or release the locking pin 210 to the inside of the shield 20 without an operation such as separation of the lock pin 210 .

However, FIGS. 5 and 6 show an embodiment of the fitting groove 227 according to the present invention, and may be formed in various types of cross-sections and shapes that can be fitted and fastened to the pin groove 217 .

In addition, the moisture prevention film 220 protects the driver's eyes by blocking direct sunlight entering the eyes during the daytime, and can be made of a material such as plastic having a shading performance to ensure sufficient visibility even in strong sunlight or reflected light. have.

As shown in FIG. 5 , the lock base 230 refers to a coupling member that is fitted and fastened to the lock pin 210 from the outside of the lock fitting hole 22 . The lock base 230 is the lock base 230 . It may include a base protrusion 231 , a cavity 231a , a protrusion receiving part 231b , and a base support plate 233 formed in the center (a central position, see FIG. 10 in more detail).

The base protrusion 231 is accommodated in the lock fitting hole 22 and refers to a protrusion formed inside the cavity 231a into which the lock pin 210 can be inserted. The cavity 231a may be formed in a straight shape, and the pin protrusion 211 inserted therein may also be formed as a straight pin protrusion 211 that may be inserted correspondingly thereto. That is, the cavity 231a is formed to have a shape corresponding to the pin protrusion 211, and when the pin protrusion 211 inserted into the cavity 231a is fastened and rotated inside the lock base 230, the cavity 231a The lock pin 210 can be provided in a fixed form by being positioned on the protrusion accommodating part 231b away from it (refer to FIG. 13 for more detail).

The cavity 231a formed from the base protrusion 231 may be formed through the lock base 230 . Also, a protrusion receiving portion 231b may be formed around the cavity 231a (refer to FIG. 13 in more detail).

The protrusion receiving part 231b is formed around the cavity 231a so that the lock pin 210 inserted and fastened into the lock base 230 is not arbitrarily disengaged or disengaged, and is blocked in the shield 20 inward direction. It refers to the inner area of the lock base 230 in which it is located. Therefore, when the lock pin 210 inserted into the lock base 230 is moved out of the cavity 231a through rotation or the like and is positioned on the protrusion receiving portion 231b (refer to FIG. 13 for more details), the lock pin ( The 210 cannot be arbitrarily disengaged from the inserted lock base 230 . Through this, the wearer of the helmet 10 can freely rotate the lock pin 210 or the lock base 230 in a clockwise or counterclockwise direction even in a state in which the lock pin 210 or the lock base 230 is fastened to the shield 20 .

On the other hand, when the lock pin 210 is disengaged from the lock base 230 , the user of the helmet 10 pulls the lock pin 210 to the inside of the shield 20 to remove the lock pin 210 from the lock base 230 . It becomes possible to disengage and disengage.

The base support plate 233 refers to a protrusion that is in close contact with the lock fitting hole 22 from the outside of the shield 20 to prevent the lock base 230 from advancing inward.

In addition, as shown in FIG. 6, the lock base 230 includes a base protrusion 231, a base support plate 233, and a base handle part 235 that are protruded to the eccentric (eccentric position, see FIG. 6 for more detail). may include The eccentrically protruding base protrusion 231 refers to a base protrusion 231 protruding in the direction of the shield 20 at a position deviated from the center of the lock base 230 .

The base handle part 235 refers to a handle of the lock base 230 extending outwardly from the base support plate 233 to form the head of the lock base 230 . The base handle part 235 may be a particularly useful handle when the helmet 10 wearer rotates the lock base 230 fastened to the shield 20 clockwise or counterclockwise.

In addition, the lock base 230 may further include a base groove 237 .

The base groove 237 is formed between the base support plate 233 and the base handle part 235 , and refers to a bent part having a cross section smaller than that of the base support plate 233 and the base handle part 235 .

As shown in FIG. 7 , the lock base 230 is fastened to the lock pin 210 with the shield 20 interposed therebetween, and the shield protective film 240 is fastened to the lock base 230 so that it is detachably attached to the lock base 230 . can be

The shield protective film 240 is fastened to the outside of the shield 20 to protect the shield 20 so that scratches or the like do not occur on the shield 20 even when the helmet 10 collides with an external shock or an external object. refers to film. In addition, the shield protective film 240 can prevent the shield 20 from being caught by dust, etc., and it is possible to continuously secure a bright view through the replacement of the shield protective film 240 . The shield protection film 240 may include engaging grooves 247 at both ends.

As shown in FIG. 7 , the engaging grooves 247 may be provided as grooves formed at both ends of the shield protective film 240 , through which the shield protective film 240 is bent formed in the lock base 230 . It can be fastened by engaging the female base groove (237).

Hereinafter, a principle of adjusting the distance between the lock bases 230 through rotation of the lock base 230 fastened to the shield 20 in an eccentric structure (eccentric position) will be described with reference to FIGS. 8 and 9 .

8 and 9 are views illustrating a case in which the lock base 230 fastened to the lock pin 210 through the lock fitting hole 22 rotates around the eccentric base protrusion 231 . 8 shows a state in which the center of the base protrusion 231 is positioned outside the center of the lock base 230 , and FIG. 9 shows a state in which the center of the base protrusion 231 is positioned inside the center of the lock base 230 . is indicating

8 and 9 , the center of the lock base 230 changes according to the rotation of the lock base 230 , but the center of the base protrusion 231 is fastened through the lock pin 210 to rotate. bar, remains constant. Accordingly, when the base protrusion 231 is positioned at the eccentricity of the lock base 230 , the distance between the lock bases 230 fastened to both sides of the shield 20 changes according to the rotation of the lock base 230 . .

When the centers of the base protrusions 231 located on both sides of the shield 20 are located outside the center of the lock base 230 (FIG. 8), the distance X between the lock bases 230 is Compared to the case in which the protrusion 231 is not eccentric to the center of the lock base 230 and is located at the center, it becomes shorter. In addition, when the centers of the base protrusions 231 located on both sides of the shield 20 are located on the inside compared to the center of the lock base 230 ( FIG. 9 ), the distance Y between the lock bases 230 is The base protrusion 231 becomes longer than the case where it is not eccentric to the center of the lock base 230 . Accordingly, Y is a longer distance compared to X, that is, the distance between the lock bases 230 is longer when the eccentric base protrusion 231 is positioned on the inside compared to the center of the lock base 230, and shorter when positioned on the outside. will lose

Accordingly, the shield protective film 240 fastened to the base groove 237, which is the bent portion of the lock base 230, is fastened to both sides of the shield 20 and is taut according to the variable distance between the lock bases 230. A coupling that can be disengaged or loosened is possible. Therefore, when replacement of the shield protective film 240 is required, the lock base 230 can be easily disconnected from the shield 20 simply by rotating it so that the transaction between the lock base 230 can be shortened. Also, by rotating the lock base 230 to increase the distance between the lock bases 230 , the shield protective film 240 can be brought into close contact with the shield 20 . To this end, the shield protective film 240 may be formed of a transparent, stretchable material.

Hereinafter, a state in which the lock pin 210 is coupled to the lock base 230 will be described with reference to FIGS. 10 to 13 .

10 is a cross-sectional view showing the lock pin 210 before it is fastened to the lock base 230. 11 shows a state in which the lock pin 210 is fitted and fastened to the eccentricity of the lock base 230 (eccentric position).

As shown in FIGS. 10 and 11 , the lock pin 210 includes a pin protrusion 211 that can be custom-fastened to the lock base 230 . In addition, the lock pin 210 includes a pin support plate 213 , a pin handle portion 215 , and a pin groove 217 .

In addition, the lock base 230 is a coupling member into which the lock pin 210 can be inserted through the cavity 231a penetrated therein. It may include a base groove 237 . As shown in FIG. 10 , the base protrusion 231 may be formed to protrude from the center of the lock base 230 (central position), but as shown in FIG. 11 , as shown in FIG. It may be provided so as to protrude (eccentric position). In addition, the base protrusion 231 may be provided in the form of a protrusion into which the pin protrusion 211 may be inserted while being accommodated in the lock fitting hole 22 . At the same time, the lock base 230 may include a protrusion receiving part 231b formed around the cavity 231a inside the lock base 230 so that the lock pin 210 inserted therein is not arbitrarily released.

10 and 11 , the protrusion receiving portion 231b refers to an inner region of the lock base 230 that is blocked so that the protruding end of the inserted and rotated pin protrusion 211 is not arbitrarily disengaged again. .

12 is a cross-sectional view showing a state immediately after the lock pin 210 is inserted into the lock base 230, and a partially enlarged view of the inserted portion.

As shown in FIG. 12 , the lock pin 210 may be coupled to the lock base 230 in a form in which the pin protrusion 211 is inserted into the cavity 231a of the lock base 230 . The shield 20 is positioned between the fastening between the lock pin 210 and the lock base 230 (indicated by an arrow A). In addition, the moisture barrier film 220 may be fitted between the pin support plate 213 and the pin handle 215 of the lock pin 210 (indicated by arrow B). In addition, the shield protective film 240 may be engaged and fastened between the base support plate 233 and the base handle part 235 (arrow C indicated). As shown in FIG. 12 , the lock pin 210 and the lock base 230 can be respectively fastened to the moisture prevention film 220 and the shield protection film 240 , and only one type of film can be used as needed. It may be fastened to the shield 20 or both films may be fastened to the shield 20 . Through this, a film capable of protecting the shield and preventing moisture can be easily mounted on the inside and outside of the shield 20, and can be easily disconnected when necessary, such as replacement.

Also, as shown in the partially enlarged view of FIG. 12 (a solid line indicates a portion shown in the cross-sectional view of FIG. 12 , and a dotted line indicates the remaining lock base and lock pin portions not shown in the cross-sectional view of FIG. 12 ), pin protrusions Immediately after being inserted into the lock base 230 , the 211 is positioned on the cavity 231a formed through the base protrusion 231 . Therefore, when the lock pin 210 advances in the inner direction of the shield 20 (the direction in which the lock pin is inserted and released from the lock base), it is not obstructed by the lock base 230 and the lock pin 210 can be easily removed. It is possible to insert and release from the lock base 230 .

That is, simply by pulling the lock pin 210 inserted into the lock base 230 inward again, the lock pin 210 can be easily removed from the lock base 230 by pulling the lock pin 210 from the lock base 230. ) can be separated.

13 is a cross-sectional view illustrating a state in which the lock pin 210 inserted into the lock base 230 is fastened through rotation and a partially enlarged view of the fastened portion.

13 , when the lock pin 210 inserted into the lock base 230 is rotated, the pin protrusion 211 also rotates in the same direction inside the lock base 230 .

As shown in the partially enlarged view of FIG. 13 (a solid line indicates a portion shown in the cross-sectional view of FIG. 13, and a dotted line indicates the remaining lock base and lock pin portions not shown in the cross-sectional view of FIG. 13), the lock base ( The pin protrusion 211, which has been rotated (fastened rotation) while being inserted into the 230, is out of the position on the cavity 231a, which allows for free insertion and release, so that insertion and release (the lock pin is released from the lock base) is restricted. It is positioned (fastened state) on the projection receiving portion 231b to be. As described above, the protrusion receiving part 231b is formed around the cavity 231a of the lock base 230, and the lock base 230 prevents the pin protrusion 211 from arbitrarily advancing in the direction in which it is inserted and released. It is an area that can be formed inside. Accordingly, the pin protrusion 211 is moved out of the cavity 231a along the rotating lock pin 210 while being inserted into the lock base 230 and positioned on the protrusion receiving portion 231b (to be placed in a fastening state through fastening rotation). ), the lock pin 210 is fastened to the lock base 230 . That is, the lock pin 210 inserted into the lock base 230 through the pin protrusion 211 is fastened to the lock base 230 through fastening rotation, and then is arbitrarily released or not separated. Through this, when the pin protrusion 211 inserted into the cavity 231a formed in a shape that can correspond to the pin protrusion 211 such as a straight line is fastened and rotated inside the lock base 230, in the cavity 231a By being positioned on the protrusion receiving part 231b outside, the lock pin 210 can be provided in a fixed form.

On the other hand, the user of the helmet 10 rotates the lock pin 210 fastened to the lock base 230 (unfastening rotation) so that the pin protrusion 211 is again positioned on the cavity 231a in the protrusion receiving part 231b. (disengaged state), the lock pin 210 can be released from the lock base 230 . That is, the lock pin 210 in the fastening state is converted back to the fastening release state through the unlocking rotation. Thereafter, the user of the helmet 10 pulls the unlocked lock pin 210 inward to the shield 20 to release the lock pin 210 from the lock base 230 , and the shield 20 and the lock base 230 . It is also possible to separate the lock pin 210 from the

14 and 15 are views for explaining a light blocking film according to an embodiment of the present invention.

The light blocking film according to an embodiment of the present invention may be attached to the shield protection film 240 to perform a UV blocking function.

Referring to FIG. 14 , in the light blocking film according to an embodiment of the present invention, an infrared blocking layer 242 is formed on the transparent substrate 241 , and a photochromic dye (P) is dispersed in the infrared blocking layer 242 . do.

The transparent substrate 241 may be glass or a polymer film such as polyethylene terephthalate (PET), polyvinyl alcohol (PVA), triacetyl cellulose (TAC), polyimide (PI), etc. In addition, the user's external There is no restriction on the type of material as long as it can maintain transparency enough not to interfere with observation.

The infrared blocking layer 242 may be formed to reflect light in an infrared wavelength band by alternately stacking a high refractive index layer 243 and a low refractive index layer 244 . In this case, as the material for the high refractive index layer, a polymer resin having a refractive index of 1.6 or more is preferable. In addition, a material having a high refractive index by nanoparticleizing a high refractive inorganic material such as TiO2, ZrO2, Al2O3 and dispersing it in a polymer resin is also applicable.

The material of the low refractive index layer 244 can be selected without limitation as long as it has a refractive index difference of 0.05 or more from the refractive index of the high refractive index layer 243 and is optically transparent, but preferably a polymer resin having a refractive index of 1.5 or less is good .

When the low refractive index layer 244 has a refractive index of 1.5 or less, the refractive index difference with the high refractive index layer 243 increases, so that the number of stacking of the high refractive index layer 243 and the low refractive index layer 244 may be reduced.

The method of implementing the alternating stacking of the high refractive index layer 243 and the low refractive index layer 244 is to use a coating machine such as a spin coater, micro gravure coater, slot die coater, comma coater, etc. A method of continuous lamination to a satisfactory thickness and a method of biaxially stretching a multilayer polymer resin continuously coated to a certain thickness so that the thickness of each continuously coated layer can be applied so that the reflected light can satisfy the constructive interference condition. In addition, various methods of alternately stacking two layers having different refractive indices may be applied.

The photochromic dye P dispersed in the infrared blocking layer 242 may include various known photochromic dyes. Photochromism is the reversible transformation of a chemical substance by absorption and blocking of energy, particularly light of a specific wavelength, to change the color of a chemical substance. That is, the photochromic material has a characteristic of being changed from an original color to another color by light of a specific wavelength, and then restored to its original color when the light of the applied wavelength is removed or heat is applied. In this case, the light of a specific wavelength may be ultraviolet light.

As the photochromic dye (P), all commonly known photochromic materials can be applied, and specifically, diarylethene, spiroypran, azobenzene, spirooxazine ), benzopyran, chromene, and any one may be selected from the group consisting of an azo compound.

In general, the photochromic dye (P) has a light absorption peak in any one of a blue wavelength region, a green region, and a red region of the visible light region, or has a light absorption peak in two or more regions. Therefore, in order to absorb light in the entire visible light region using the photochromic dye (P), it is preferable to mix dyes having different light absorption peaks.

For example, when UV light contained in external light is absorbed, a first photochromic dye having a light absorption peak in a blue wavelength region, a second photochromic dye having a light absorption peak in a green region, and a light absorption peak in a red region It can be configured to have an absorption wavelength in the entire visible light region by mixing a third photochromic dye having In this case, there is an advantage that absorption occurs in the entire visible light region to have an excellent light blocking effect.

In addition, the color of the light-shielding film may be adjusted by using a photochromic dye having an absorption peak in a specific wavelength band according to the user's preference. For example, by using a photochromic dye having light absorption peaks in the green region and the red region, the color of the light-shielding film can be implemented as blue when irradiated with ultraviolet light. It can be variously transformed.

The photochromic dye (P) according to the present invention is formed while being dispersed in the infrared blocking layer 242 . Specifically, the high refractive index layer 243 or the low refractive index layer 244 may be dispersed only in one layer or may be dispersed in all layers.

In addition, the infrared blocking layer 242 according to the present invention may be formed of cholesteric liquid crystal (CLC). Such a cholesteric liquid crystal has a characteristic of reflecting circularly polarized light having a wavelength band similar to the length of the spiral pitch and coincident with the spiral rotation direction of the liquid crystal.

Accordingly, the infrared blocking layer 242 reflects the incident first polarized light and transmits the second polarized light, and reflects the second polarized light passing through the first cholesteric layer 243 . The second cholesteric layer 244 may be formed.

For example, the first cholesteric layer 243 is configured to transmit left circularly polarized light (second polarized light) while reflecting right circularly polarized light (first polarized light), and the second cholesteric layer 244 is configured to transmit left circularly polarized light (first polarized light). It is configured to reflect 2 polarized light), so that it can theoretically reflect 100% of light in the infrared wavelength band. In this case, the circularly polarized light reflected by the first cholesteric layer 120 and the second cholesteric layer 130 may be interchanged.

The first and second cholesteric layers 243 and 244 may have a thin film form such as a film, and may be applied in various forms.

Specifically, the first and second cholesteric layers 243 and 244 may be formed by polymerization of a cholesteric liquid crystal, a chiral compound, and a curing accelerator. Specifically, as the cholesteric liquid crystal, a photocurable nematic liquid crystal composed of long rod-shaped molecules may be selected.

There are two types of chiral dopant, a right chiral dopant and a left chiral dopant, and the helical direction of the cholesteric liquid crystal changes according to the type of chiral dopant added.

In an embodiment of the present invention, the content of the chiral dopant may be appropriately adjusted in order to reflect light in the infrared wavelength band. Specifically, the length of the spiral pitch may be adjusted to about 800 nm to 1200 nm so that the first and second cholesteric layers 120 and 130 can reflect the infrared wavelength band. In addition, if necessary, the first and second cholesteric layers 120 and 130 may be formed by stacking a plurality of layers having different lengths of spiral pitches.

At this time, the plurality of first cholesteric layers 120 and the second cholesteric layers 130 may be alternately stacked, and a plurality of other first cholesteric layers 120 having different helical pitches are first formed and a plurality of them of the second cholesteric layer 130 may be formed.

Also, the first and second cholesteric layers 243 and 244 may be implemented as one cholesteric layer. That is, it can be implemented as a cholesteric liquid crystal having a continuous pitch change from top to bottom to selectively reflect different polarized light. Such a configuration may be implemented by adjusting the type and concentration of the chiral dopant according to the thickness direction of the cholesteric liquid crystal.

At this time, when the photochromic dye (P) is dispersed in any one of the first cholesteric layer 120 and the second cholesteric layer 130, the cholesteric layer is 90 wt% to 95 wt% of the cholesteric liquid crystal %, 0.3 wt% to 0.9 wt% of a chiral compound, and 0.05 wt% to 6.0 wt% of a photochromic dye.

At this time, when the photochromic dye is less than 0.05 wt%, there is a problem that the absorption rate of visible light is low and does not have a sufficient light blocking effect, and when it exceeds 6.0 wt%, the alignment of the cholesteric liquid crystal is caused by the excessively added photochromic dye There is a problem in that the infrared blocking efficiency falls apart from this.

Therefore, when the photochromic dye (P) is included in each of the first cholesteric layer 120 and the second cholesteric layer 130, the content of the photochromic dye mixed in each layer is reduced to align the cholesteric liquid crystal It has the advantage of being able to maintain sufficient shading effect while solving this problem.

However, the present invention is not limited thereto, and the photochromic dye P may be included in an adhesive layer (not shown) bonding the first cholesteric layer 243 and the second cholesteric layer 244 to each other. In this case, since the photochromic dye (P) does not affect the alignment of the cholesteric liquid crystal at all, there is an advantage in that the photochromic dye (P) can be sufficiently dispersed. In this case, the photochromic dye (P) may be dispersed in the adhesive resin, and the type of the adhesive resin is not limited. However, if the photochromic dye is contained in an amount of 8.0 wt % or more in the total adhesive resin, there is a problem in that the adhesiveness of the adhesive resin is deteriorated.

According to the present invention, an adhesive layer 246 and a protective layer 247 are further formed on the infrared blocking layer 242 . The adhesive layer 246 serves to adhere the shielding film to the shield protective film 240 so that it can be attached, and the protective layer 247 serves to protect the adhesive layer 246 in the supply stage of the shielding film. do.

The protective layer 247 is configured such that a logo of a light-shielding film manufacturer can be displayed, and a user can easily peel off the protective layer 247 to attach the light-shielding film to the shield protective film 240 .

At this time, since the light-shielding film is attached to the shield protective film 240 by the adhesive layer 246, it may be attached to the outer surface (the surface on which external light is directly incident) or the inner surface of the shield protective film 240 according to the user's selection. . However, since the photochromic dye P is very sensitive to heat, the configuration of the light blocking film may be different depending on the case where it is attached to the outer surface of the shield protective film 240 and the case where it is attached to the inner surface of the shield protective film 240 to maintain maximum thermal stability.

For example, FIG. 14 shows a configuration capable of maximally maintaining the thermal stability of the photochromic dye when the light blocking film according to the present embodiment is attached to the inner surface of the shield protective film 240 .

As shown in FIG. 14 , when external light is incident on the adhesive layer, the photochromic dye P is preferably positioned in the infrared blocking layer positioned at the outermost side in the incident direction of external light. That is, it is dispersed in the infrared blocking layer 120 closest to the transparent substrate 241 .

With this configuration, when the adhesive layer 246 is attached to the inner surface of the shield protective film 240, the external light passes through the infrared blocking layer 242 and is absorbed by the photochromic dye P, so that thermal stability is maximized. can be maintained as

In this case, an ultraviolet blocking layer 245 may be additionally disposed between the infrared blocking layer 242 and the transparent substrate 241 . When the photochromic dye (P) dispersed in the infrared blocking layer 242 absorbs ultraviolet rays of a certain intensity or more, the absorption wavelength band changes to the visible light region, so the ultraviolet blocking layer 245 absorbs ultraviolet rays that the photochromic dye cannot absorb. It can play a blocking role.

The UV blocking layer 245 may be formed by alternately stacking high refractive index layers and low refractive index layers having different refractive indices as in the infrared blocking layer 242 , or may be formed as a cholesteric layer.

On the contrary, when the light blocking film is attached to the outer surface of the shield protective film 240, the photochromic dye (P) is dispersed in the infrared blocking layer 130 located at the outermost side in the incident direction of external light as shown in FIG. it's good According to this configuration, since external light passes through the transparent substrate 241 and the infrared blocking layer 242 and is absorbed by the photochromic dye P, thermal stability can be maximally maintained.

Also, the UV blocking layer 245 may be formed between the IR blocking layer 242 and the adhesive layer 246 to block UV rays that the photochromic dye cannot absorb.

As such, the configuration of the light-shielding film is different depending on whether it is attached to the outer or inner surface of the shield protective film 240 , so the protective layer 247 has a light-shielding film on which surface (outer surface or inner surface) of the shield protective film 240 . You can insert a guide that it is preferable to be attached to the.

16 and 17 are views for explaining a light blocking film according to another embodiment of the present invention.

Referring to FIG. 16 , the light blocking film according to another embodiment of the present invention includes a photochromic layer 248 formed on the transparent substrate 241 and an infrared blocking layer 242 formed on the photochromic layer. .

Since the infrared blocking layer 242 according to the embodiment of the present invention is the same as described above, a detailed description thereof will be omitted, and the photochromic layer 248 will be mainly described.

The photochromic layer 248 may be prepared by mixing a photochromic dye (P) and a binder resin. The photochromic dye (P) is the same as described above, and any known resin composition may be applied to the binder resin, but a transparent resin composition is preferred, and, for example, a transparent acrylic resin may be selected. . An infrared blocking layer 242 , an adhesive layer 246 , and a protective layer 247 may be formed on the photochromic layer 248 .

At this time, the arrangement relationship of each layer may be configured differently depending on whether the light-shielding film is attached to the outer or inner surface of the shield protective film 240 as described in the embodiment. That is, in the light blocking film attached to the inner surface, as shown in FIG. 16 , a UV blocking layer 245 , a photochromic layer 248 , an infrared blocking layer 242 , and an adhesive layer 246 are sequentially formed on one surface of the transparent substrate 241 . The light-shielding film formed and attached to the outer surface is, as shown in FIG. 17 , an infrared blocking layer 242 , a photochromic layer 248 , an UV blocking layer 245 , and an adhesive layer 246 on the transparent substrate 241 . stacked in order.

18 is a view for explaining a light blocking film according to another embodiment of the present invention.

Referring to FIG. 18 , the light blocking film according to another embodiment of the present invention includes an infrared blocking layer 242 formed on a transparent substrate 241 and an adhesive layer 246 formed on the infrared blocking layer 242 . , and a protective layer 247 formed on the adhesive layer 246 , wherein the photochromic dye (P) is dispersed in the adhesive layer 246 .

Since the infrared blocking layer 242 according to the embodiment of the present invention has already been described above, further detailed description thereof will be omitted. The photochromic dye (P) formed in the adhesive layer 246 is contained in an amount of 0.03 wt% to 8.0 wt% based on the total adhesive layer composition. When the photochromic dye (P) is included in an amount of 0.03 wt% or less, a desired absorption rate of visible light cannot be achieved, and when it is included in an amount of 8.0 wt% or more, a problem in adhesion occurs.

At this time, in the third embodiment of the present invention, since the photochromic dye (P) is included in the adhesive layer 246 , in order to maintain maximum thermal stability when attached to the shield protective film 240 , the shield protective film 240 is It is preferably attached to the outer surface.

The photochromic composition according to the present invention is characterized in that it comprises an acrylic resin, a crosslinking agent having a structure derived from an intramolecular UV stabilizer, and a photochromic dye.

Acrylic refers to acrylic yarn or acrylic fiber. Acrylic fiber is made from homopolymerization of acrylonitrile (CH₂=CHCN) or a copolymer with other components (acetylene + cyanic acid). Classified as krill fiber (35-85 %). Acrylic fibers are man-made fibers made of linear synthetic polymers with fiber-like performance with an acrylonitrile content of 85% or more. Acrylonitrile had already been synthesized in the late 1890s, and it was soon discovered that it was made by polymerization.

This polymer decomposes before being melted by heating, and although no suitable solvent was found, it was discovered during World War II that it could be mixed with synthetic rubber. The first commercialization of this polymer compound was solved by DuPont in 1945, and commercialized as a product called orlon in 1945, and Acrilan by Monsanto in 1952. Produced under the Iranian trade name.

Originally, acrylic can be seen as a material that was developed by focusing on lightness, manufacturing convenience, processing convenience, and light weight.

Acrylic is a material that shows the convenience of plastic and the clean properties of glass. Contrary to these advantages, there are disadvantages of being too weak to fire and somewhat less transparent than glass.

Acrylic has a specific gravity of 1.17 to 1.20, about 1/2 of that of inorganic glass, and the higher the specific gravity, the higher the pressure ratio, so the mechanical and physical properties are good.

The optical properties of acrylic have excellent transparency with a light transmittance of 92 to 98%, and the spectral light transmittance is granular at a wavelength of 2,500 Å in the ultraviolet, so it begins to transmit ultraviolet rays and shows superior ultraviolet transmittance than ordinary inorganic glass. .

In the present invention, the acrylic resin is sufficient as long as it is a compound having a double bond between the carbonyl group of the ester group and the conjugated carbons, and the substituent thereof is not particularly limited, and an acrylic monomer or a polymerization unit containing it contains polymers.

The acrylic monomer is meant to include acrylate derivatives as well as acrylate, and should be understood as a concept including alkyl acrylate, alkyl methacrylate, and alkyl butacrylate.

Specifically, the acrylic monomer is methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, methyl ethacrylate, ethyl ethacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate One or more acrylic monomers selected from the group consisting of , hydroxypropyl acrylate and hydroxypropyl methacrylate may be used, and in particular, it is most preferable to use methyl methacrylate (MMA).

The polymer including the acrylic monomer as a polymerization unit may further include an ethylenically unsaturated monomer polymerizable with the acrylic monomer.

The content of the acrylic resin is preferably 65 to 99% by weight.

In the present invention, transparency and weather resistance of the film can be greatly improved by using a crosslinking agent including a structure derived from an intramolecular UV stabilizer in the photochromic composition.

The energy that causes the chemical reaction can be obtained not only from heat but also from light. Ultraviolet rays with a wavelength of 3400 Å or less have sufficient energy to decompose molecules. Plastics are decomposed by ultraviolet rays of about 3000 to 3400 Å of sunlight, resulting in discoloration and brittleness.

Therefore, additives added for the purpose of protecting plastics by blocking or absorbing these ultraviolet rays are called ultraviolet stabilizers. UV stabilizers are classified into absorbers, quenchers, and hindered amine light stabilizers (HALS) according to their mechanism of action.

In addition, according to the chemical structure, it can be divided into phenyl salicylates (absorbent), benzophenone (absorbent), benzotriazole (absorbent), nickel derivatives (quenching agent), and radical scavengers. can

In the present invention, the crosslinking agent is not particularly limited as long as it contains a structure derived from an intramolecular UV stabilizer.

The crosslinking agent is benzophenone-based, acetphenone-based, anthraquinone-based, monoethylenically unsaturated aromatic ketone, acrylamido-functional disubstituted acetyl aryl ketone, substituted triazine, piperidine-based, methoxysilane-based, ethoxy It is characterized in that it contains at least one selected from the group consisting of silane-based, oxysilane-based, alkoxysilane-based, acrylamide-based, acrylamido glycolic acid and aziridine.

Specifically, as the crosslinking agent, those based on benzophenone, acetophenone, anthraquinone, etc., monoethylenically unsaturated aromatic ketones such as 4-acryloxybenzophenone (ABP), p,p'bis(acryloyloxy)benzophenone (p,p'bis(acryloyloxy)benzophenone), acrylamido-functional disubstituted acetyl aryl ketone, substituted triazine, 2,4-bis(trichloromethyl)-6-p-methoxystyrene-5- Triazine, chromophore Halomethyl-5-triazine, 1,3,5-triacroylamino-hexahydro-s-triazine (1,3,5-triacroylamino-hexahydro-s-triazine), 1-methacryl Royl-4-methacryloylamino-2,2,6,6-tetramethylpiperidine (1-methacryloyl-4-metacryloylamino-2,2,6,6-tetramethylpiperidine), methacryloxypropyltrimethine Toxysilane, nyldimethylethoxysilane, vinylmethyldiethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, vinyltriphenoxysilane, monoethylenically unsaturated mono-, di- and trialkoxy silane compounds, N- methylol acrylamide, acrylamido glycolic acid and aziridine crosslinking agents such as bisamides. In particular, the crosslinking agent is characterized in that it is a hindered amine light stabilizer (HALS).

The crosslinking agent is preferably included in an amount of 0.01 to 30% by weight or less. When 30% or more is added, that is, when the resin is used at less than 65%, the film is easily shattered due to poor flexibility.

Photochromic materials refer to materials that change color when exposed to light, and can be broadly divided into inorganic compounds and organic synthetic products.

A photochromic material is called a photochromic. For example, in the form of an inorganic material, there are TiO2 and ZnS, and as an organic material, Oxazine, Naphtopyran, and Benzo. ), and SpiroPyrans. Among them, oxazine and spiropyran are the most commonly used.

In the present invention, as the photochromic dye, those known in the art may be used, for example, an organic compound of spiro-oxazine series or naphtopyran series may be used.

In the present specification, a compound of a specific chemical structure is a compound including the chemical structure as a core structure, and includes both a compound consisting of only the chemical structure and a derivative thereof. The photochromic dye may be used in an amount of 0.01 wt% to 5 wt%, preferably 0.1 wt% to 3 wt%.

When the dye is used at 0.01% or less, the optical density is lowered and the color does not appear well, and at 5% or more, the optical density exceeds the saturation point, and in some cases, there may be a problem in the solubility of the dye.

Additives known in the art may be added to the photochromic composition within a range that does not impair physical properties for end use.

For example, polymerization initiators, stabilizers, ultraviolet absorbers, antioxidants, chain transfer agents, IR absorbers, defoamers, antistatic agents, mold release agents and the like may be added. Each of these additives may be used in an amount of 0.01 wt% to 5 wt%. In addition, in order to represent the initial color, one or two or more types of general dyes of various colors may be mixed and used within the range of 0.0001 to 0.5%.

The film according to the present invention preferably has a thickness of 200 mm to 1 mm.

The film according to the present invention has a weather resistance of 1,000 hours or more, and can be used for vehicle glass and the like.

Here, the weather resistance means the time it takes for the transmittance at λmin (the wavelength value with the smallest transmittance value) to increase from the initial transmittance to half the transmittance at the time of discoloration.

That is, if the transmittance at the time of discoloration is 10% before the weather resistance test, the time taken for the transmittance to increase to 55% at the time of discoloration during the weather resistance test is defined as the weather resistance.

In order to measure the weather resistance, using a UVA fluorescent lamp in ATLAS UV 2000, an accelerated weather resistance tester, irradiated for 8 hours under the condition of 0.77 W/m2 of light at 340 nm, 60 ° C, and 4 hours at 50 ° C. Condensation A method of measuring the optical density by exposing the sample to ASTM G 154-99 cycle repeating can be used.

The present invention also provides a method of making the aforementioned film.

Specifically, according to the present invention, a photochromic composition including the above-described acrylic resin, a crosslinking agent and a photochromic dye is injected into a space formed from a pair of substrates and a gasket disposed between the pair of substrates, and cured It provides a method for producing a photochromic film comprising the step of:

In the manufacturing method of the film according to the present invention, the gasket material is not particularly limited as long as it does not dissolve in the photochromic composition.

The gasket may be of a hollow shape with an empty inside, or may be of a filling type.

Further, the cross section may be circular, rectangular, trapezoidal, or the like, and these may be cone-shaped.

A person of ordinary skill in the art may determine the thickness of the gasket according to the desired film thickness, and the size of the gasket may be determined according to the desired film size.

In the present invention, the substrate material may be used without limitation as long as it is known in the art.

For example, glass, metal, or a plastic substrate may be used, but glass is most preferred. In addition, the substrate may have a flat surface, but may have a specific shape on the surface if necessary.

If necessary, an adhesive sheet for bonding the gasket and the substrate may be provided between the gasket and the substrate, or a sealing film for sealing the gasket and the substrate may be used.

The method according to the present invention may further include the step of separating the substrate and the gasket and separating the acrylic film after the curing step.

In the coating process of a thin film in which tin (Sn) or tin (Sn)-indium (In) alloy and silicon (Si) are alternately stacked according to a preferred embodiment of the present invention, first, a predetermined transparent film is formed (S110) , a tin (Sn) thin film or a tin (Sn)-indium (In) alloy thin film is coated on the surface of the resultant by sputtering (S120).

Next, a silicon (Si) thin film is coated on the surface of the thin film formed in step S120 by sputtering (S130).

The coating process is completed by repeating steps S120 and S130 a plurality of times (S140).

In this case, the tin thin film, the tin-indium thin film and the silicon thin film are preferably coated to have a thickness of 50 nm or less.

First, after forming a predetermined transparent film (S210), a mixed thin film in which silicon (Si) is mixed with an alloy of tin (Sn) or tin (Sn)-indium (In) by sputtering on the surface of the resultant By coating (S220), the coating process is completed.

At this time, in the mixed thin film in which silicon (Si) is mixed with the tin (Sn) or tin (Sn)-indium (In) alloy, the mixing ratio of silicon (Si) is preferably 10 to 40 wt%.

As such, when an alloy thin film in which silicon is cross-stacked on a tin or tin-indium alloy thin film or a mixed thin film in which silicon is mixed with a tin-indium alloy thin film is coated, only general tin or tin-indium alloy is coated This can solve the problem of discoloration at high temperature and high humidity or discoloration when left in UV light for a long time.

In addition, as described above, when an alloy thin film in which silicon is cross-stacked on an alloy thin film of tin or tin-indium is formed, as the thickness of the film increases, the resistance value decreases and the non-conductive characteristic disappears can be solved.

That is, in the case of coating only tin or an alloy of tin-indium, as the thickness of the film increases, the resistance value drops to 1 MΩ or less and there is a problem that the non-conductive properties disappear. Alternatively, a silicon thin film layer was formed between the tin-indium alloy film and the film to prevent the overall lowering of the resistance value and to maintain a high resistance thin film.

A brief look at the sputtering method applied to the present invention, after generating plasma by injecting a sputtering gas into a chamber made of a vacuum atmosphere, the target to which the particles in the plasma are to be formed It is a method of colliding with a material and coating a material separated from a target by the collision on a substrate.

In general, the sputtering gas uses argon (Ar) as an inert gas. A sputter system uses a target as a cathode and a substrate as an anode. When power is applied, the injected sputtering gas collides with electrons emitted from the cathode to be ionized (Ar+), and these ions are attracted to the target, which is the cathode, and collide with the target.

The energy of the ions is transferred to the target by this collision, and atoms and molecules of the target material are released into the chamber, and the released target material is formed as a thin film on the substrate.

The thin film manufacturing technology using this sputtering method can precisely control the thickness of the coating layer up to several tens of nm, and can very easily handle the partial coating process using a simple mask.

On the other hand, the transparent film used in the present invention is a general transparent film used in the preparation of a film for blocking sunlight, and any one having high transmittance can be used.

19 is a view for explaining a shield according to another embodiment of the present invention.

The shield according to another embodiment of the present invention may further include a contact block 250 formed on at least a portion in contact with the helmet body in addition to the configuration of the shield 20 shown in FIG. 3 .

Preferably, a plurality of contact blocks 250 may be formed at the lower end of the surface in contact with the helmet body.

20 is a view for explaining a contact block according to an embodiment of the present invention.

Referring to FIG. 20 , the contact block 250 is made of a rubber material, and a pair of side plates 253 connecting both sides of the upper plate 251 and the lower plate 252 and the upper plate 251 and the lower plate 252. made to form a closed space (S) therein.

The pair of side plates 253 come into contact with the shield 20 and the helmet body, respectively, and the horizontally continuous contact protrusions 255 along the longitudinal direction have different heights to protrude at a plurality of places. 254 may be integrally provided.

That is, the contact block 250 of the present invention has an internally sealed structure, and air is filled in the internal sealed space (S) at a predetermined pressure to improve the sound insulation effect according to its own elastic force.

On the other hand, a fastening member for supporting the head portion 250b of the fastening bolt 250a inside the support plate 254 integrally formed with the side plate 253 in contact with the shield 20 among the pair of side plates 253 . 256 is inserted, this fastening member 256 is made of a metal material, and at the inlet side of the fastening groove 257 in which the fastening bolt 11 is supported, a guide hole is provided so that the bolt fastening position can be adjusted. 258 is formed in the form of a long hole along the longitudinal direction, the buffer space 259 is formed in a symmetrical form on both sides of the fastening groove 257.

This buffer space 259 has the effect of allowing the width of the fastening member 256 to be elastically varied in the process of inserting the fastening member 256, so that the coupling operation with the shield 20 can be made more easily. do.

On the other hand, as described above, in the support plate 254 forming both side walls of the contact block 250, the contact protrusions 255 are formed to protrude at a plurality of locations with different heights, and these contact protrusions 255 are fastening bolts. When the fastening member 256 is pressed toward the shield 20 by the fastening force of 250a, the shield 20 and the contact protrusion 45 are in linear contact on each layer, and the shield 20 is closed. , it can be seen that the occurrence of leakage through the gap can be effectively blocked because the helmet body and the contact protrusion 255 are in linear contact on each layer.

In addition, since the air pocket is formed by the closed space (S) with high adhesion between the contact block 250 and the helmet body, the sound absorption effect can be maximized.

In addition, since a metal fastening member 256 for supporting the fastening bolt 250a is inserted into one side of the contact block 250, more stable installation is achieved and the installation and replacement of the contact block 250 is facilitated can be done

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing the technical spirit or essential features. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: helmet
101: helmet body
102: shield

Claims (5)

A shield rotatably coupled to a helmet body surrounding a user's head to open and close an opening provided in the helmet body, and to which a light-shielding film comprising a photochromic dye is attached, the shield comprising:
The shield is
Containing; a contact block formed on at least a portion in contact with the helmet body;
The contact block is
The upper and lower plates and a pair of side plates connecting both sides of the upper and lower plates to form a sealed space inside form an internal sealed structure, and air is filled in the internal sealed space with a certain pressure,
The pair of side plates,
A support plate, which is in contact with the shield and the helmet body, respectively, and forms a structure protruding from a plurality of places by having contact protrusions horizontally continuous along the longitudinal direction of different heights, are integrally formed,
A side plate in contact with the shield among the pair of side plates,
A fastening member for supporting the head of the fastening bolt is inserted into the integrally formed support plate,
The fastening member is
It is made of a metal material, and at the entrance side of the fastening groove in which the fastening bolt is supported, a guide hole is formed in a long hole shape along the longitudinal direction so that the bolt fastening position can be adjusted. formed,
The adhesion protrusion,
As the fastening member is pressed toward the shield by the fastening force of the fastening bolt, the shield and the contact protrusion are in linear contact on each layer, and when the shield is closed, the helmet body and the contact protrusion are linear in each layer A shield that adheres to.
According to claim 1,
The light-shielding film,
an infrared blocking layer formed on the transparent substrate;
an adhesive layer formed on the infrared blocking layer; and
Including; a protective layer formed on the adhesive layer;
The infrared blocking layer,
A shield in which a photochromic dye is dispersed in the outermost layer in the incident direction of external light.
According to claim 1,
The light-shielding film,
an infrared blocking layer formed on the transparent substrate;
a photochromic dye dispersed in the infrared blocking layer;
an adhesive layer formed on the infrared blocking layer; and
Including; a protective layer formed on the adhesive layer;
The shield of claim 1, wherein the infrared blocking layer includes a first cholesteric layer that reflects the incident first polarized light while transmitting the second polarized light, and a second cholesteric layer that reflects the second polarized light.
According to claim 1,
Lock fitting holes formed through both sides;
a pin lock device fastened to the lock fitting hole to fasten the shield to the helmet body;
a moisture-preventing film fitted and fastened between the pin lock devices; and
and a shield protection film to which the light blocking film is attached and fastened to the pin lock device.
According to claim 1,
The photochromic dye is
A shield in which a plurality of photochromic dyes having different visible light absorption wavelength bands are mixed.

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