KR100925995B1 - Method for fabricating retroreflective unit - Google Patents

Abstract

The present invention relates to a method of manufacturing a retroreflective unit, comprising: forming a resin layer on a carrier film; Curing or solidifying the resin layer in a state in which a plurality of frame structures are pressed in a molding frame in which a plurality of frame structures are regularly arranged; The first space of the polygon defined by the protrusion formed between the adjacent ones on the resin layer by removing the mold, and the same angle at the center of the plane of the first space of the polygon comprising a circle or a triangle in the plane And forming a plurality of second spaces perpendicular to the surface of the resin layer and formed in a fan shape or a right triangle therein; Sequentially forming a protective film and a reflective film on the surface of the resin layer; Forming first and second bases filling the first and second spaces on the reflective film, respectively. Therefore, the three-sided reflective film is formed in a cube corner form where it meets at one vertex, so that it can retroreflect light incident from all directions as well as the front surface, and can be randomly arranged when mixed with paint and used. It not only reflects the incident light, but also maintains the retroreflective properties in the rain.

Retroreflective unit, cube corner, reflector, fan, polyhedron

Description

Method for manufacturing retroreflective unit {Method for fabricating retroreflective unit}

The present invention relates to a method of manufacturing a retroreflective unit, and more particularly, to a method of manufacturing a retroreflective unit having a retroreflective property with respect to light incident from all directions as well as from the front.

Visibility to objects and people at night is very important, especially for the driver of the vehicle. There are two ways to increase night visibility to objects and people: active and passive.

Active devices provide visibility by means of a constant light source, flash light source or a combination thereof. Although active devices provide visibility, energy, in particular electrical energy, is needed to provide the desired light. The energy source is not always available and runs out of light when it is exhausted. Therefore, the active device has a disadvantage in that it can not properly exhibit its function in the event of a power outage, blackout or the like.

Examples of passive devices are scattering reflectors, mirror reflectors and / or retroreflectors. The retroreflective body returns most of the light incident from a light source such as a headlight of a car or a truck to the light source, so that the driver of the vehicle can safely drive at night. Retroreflective bodies are currently used in fashion sectors such as personal safety, industrial safety, traffic safety and accessories.

In the above, the retroreflective body used in the safety clothing in the industrial safety field and the road sign or the display plate in the traffic safety field is made into a sheet shape, processed into a desired shape or pattern, and attached by a method such as bonding or sewing, so that the surrounding environment is dark. It is also used to be easily identified by the incident light source. Retroreflective sheets are attached to the clothing of people working on roads or in hazardous locations, such as environmental sanitation workers, firefighters, police officers, workers at factories or construction sites, and safety personnel at each part, to help people around them clearly see where they are. It can have a great effect on worker's protection and safety.

In addition, when the retroreflective body is added to the paint and applied to the lane marking line of the road, it is easy to identify the driver at night, thereby easily dividing the lane and driving safely.

As the retroreflective body in the above, glass beads are generally used.

However, the glass bead is used to form a metal reflective film on the surface of the hemisphere, and the retroreflective property only appears in the half. Particularly, when used in mixing with the paint, the reflective film can be randomly arranged so that the metal film can protrude above the paint. There is a problem of deterioration. In addition, when the bead surface is covered with water in the rain, there is a problem in that the spherical curve is not formed and thus does not exhibit the retroreflective characteristics.

Accordingly, it is an object of the present invention to provide a method of manufacturing a retroreflective unit having a retroreflective property for light incident from all directions as well as the front surface by forming a cube corner type reflective film.

Another object of the present invention is to reflect the incident light even when randomly arranged when used in a mixed paint to prevent the brightness is lowered, and retroreflective to maintain the retroreflective properties even in the external environment, such as liquid, solid phase, weather It is to provide a manufacturing method of the unit.

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Method of manufacturing a retroreflective unit according to an embodiment of the present invention for achieving the above object comprises the steps of forming a resin layer on the first carrier film; Curing or solidifying the resin layer in a state in which a plurality of frame structures are pressed in a molding frame in which a plurality of frame structures are regularly arranged; The first space of the polygon defined by the protrusion formed between the adjacent ones on the resin layer by removing the mold, and the same angle at the center of the plane of the first space of the polygon comprising a circle or a triangle in the plane And forming a plurality of second spaces perpendicular to the surface of the resin layer and formed in a fan shape or a right triangle therein; Sequentially forming a protective film and a reflective film on the surface of the resin layer; Forming first and second bases filling the first and second spaces on the reflective film, respectively.

Hardening or solidifying the first and second bases and removing the first carrier film together with the resin layer to separate the half-type retroreflective unit having the second frame formed only on the first frame. Include.

Forming first and second bases on the second carrier film including the resin layer by a separate process similar to the method of forming the first and second bases on the first carrier film; Attaching the first and second carrier films such that the respective first bases are in contact with each other and curing or solidifying the first and second bases on the second carrier film; And removing the first and second carrier films together with the respective resin layers to separate the pool type retroreflective unit having the second frame formed above and below the first frame.

The resin layer is formed by applying acrylic, urethane, polystyrene, polyethylene, polypropylin, polyvinyl alcohol, or a synthetic resin or silicone resin of polyester with a thickness of 100 µm to 5 mm.

In the above, the second space is formed to have a width of 20 µm to 1 mm.

The protective film is formed by depositing silicon oxide or silicon nitride to a thickness of 50 to 500 kPa by the method of CVD or PECVD.

The reflecting film is deposited by Al, Ag, Au, Cu, Zn, Pt, W, Ti, TiO2 or graphite by vacuum deposition, sputtering, CVD, or PECVD, or plated to form a thickness of 50 to 1000 mm 3. .

In the above, the first and second bases are acrylic adhesives, PVC (polyvinyl chloride) adhesives, epoxy adhesives, urethane adhesives, polystyrene adhesives, polyethylene adhesives, polypropylene adhesives, polyvinyl alcohol adhesives, or synthetic resin adhesives of silicone adhesives or silicone adhesives. To form.

The method may further include molding a filling part by molding a synthetic resin that may transmit light on the protective film of the half- or full-type retroreflective unit separated from the above.

Method of manufacturing a retroreflective unit according to an embodiment of the present invention for achieving the above object comprises the steps of forming a separation layer on the first carrier film is formed with a hemispherical or semi-polyhedral groove; Forming a filling part by applying a transparent synthetic resin to fill the groove on the separation layer; Hardening or solidifying the filling part in a state in which a plurality of frame structures are pressed by a mold in which a plurality of frame structures are regularly arranged; Removing the mold to form a plurality of spaces having the same angle at the center of the plane inside the filling part; Forming a reflective film on a surface of the filling part including the space; Forming a frame filling the space on the reflective film.

Forming a frame on the second carrier film by a separate process similar to the method of forming the frame on the first carrier film; Attaching the first and second carrier films such that the respective frames are in contact with each other and curing or solidifying the frame on the second carrier film; The method may further include removing the retroreflective unit further comprising removing the first and second carrier films.

Accordingly, the present invention can be formed in a cube corner form where the three-sided reflective film meets at one vertex to retroreflect light incident from all directions as well as the front surface. Even when arranged in the light source, the incident light can be reflected to prevent the luminance from being lowered, and the retroreflective property can be maintained even in rainy weather.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a perspective view of a retroreflective unit according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2.

The retroreflective unit 11 according to an embodiment of the present invention is a half type capable of retroreflecting light incident from one side, and includes a frame 13, a reflective film 15, and a protective film 17. .

In the above, the frame 13 is composed of a plurality of cells 19 having a configuration of cube corners where three faces meet about one point. That is, each of the cells 19 constituting the frame 13 has a plurality of second bases 13b having a fan shape on the circular first base 13a with a center of reference 45 to 120 ° inside. For example, arranged to have the same angle of 90 °. The frame 13 has a thickness of about 20 μm to 1 mm, and when rotated along the X and Y axes, has a hemispherical shape and a diameter of about 100 μm to 20 cm.

Frame 13 is a silicone adhesive, or a synthetic resin adhesive, for example, acrylic adhesive, PVC (Polyvinyl Chloride) adhesive, epoxy adhesive, urethane adhesive, polystyrene adhesive, polyethylene adhesive, polypropylene adhesive, polyvinyl alcohol adhesive Or a polyester adhesive or the like.

If the size of the frame 13 is small, for example, when the diameter of the center line of the first base 13a is about 100 μm to 5 mm, the reflective film 15 may have Al, Ag, Au on the surface of the frame 13. , Cu, Zn, Pt, W, Ti, TiO2 or graphite by vacuum deposition, sputtering, vapor deposition such as CVD (Plasma-Enhanced CVD) or PECVD (Plasma-Enhanced CVD) It is formed to a thickness of.

In addition, when the size of the frame 13 is large, for example, when the diameter of the center line of the first base 13a is about 5 mm to 20 cm, the reflective film 15 has a metal plate, a ceramic plate, It may be formed of a synthetic resin plate and a composite plate, or a metal plate mirror-polished on both sides.

The protective film 17 is formed on the reflective film 15 to prevent the reflective film 15 from being oxidized in contact with air or moisture. In the above-described protective film 17, when the size of the frame 13 is small, for example, when the diameter is about 100 to 5 mm, silicon oxide or silicon nitride is about 50 to 500 kPa by a method such as CVD or PECVD. It is formed by depositing to a thickness of. Further, the protective film 17 may be formed by applying a transparent paint when the size of the frame 13 is large, for example, when the diameter of the frame 13 is about 5 mm to 20 cm.

4 is a state diagram of use of the half-type retroreflective unit 11 according to the embodiment of the present invention having the above-described configuration.

The first base 13a when light enters the first base 13a of any of the plurality of cells 19 having a cube corner from the light source (not shown) inclined with respect to the plane of the X axis and the plane of the Y axis. Reflected by the reflective film 15 formed on the X-axis plane with the same angle of incidence as the incident angle. The reflected light is incident on one of the second bases 13b of the selected cell 19, for example, the reflective film 15 formed on the left side, and is reflected with the same incident angle with respect to the plane of the Y axis.

Accordingly, the light reflected from one of the second bases 13b of the selected cell 19, for example, the reflective film 15 formed on the left side, is transmitted to the other one of the second bases 13b of the cell 19, For example, the reflective film 15 formed on the right side is retroreflected toward the light source with the same angle of incidence as the incident angle of light inclined with respect to the X-axis plane and the Y-axis plane input to the first base 13a. In addition, the retroreflective unit 11 may retroreflect light incident in all directions on one side by a plurality of cells 19 having a cube corner configuration. Therefore, the retroreflective unit 11 can retroreflect light incident in all directions on one side even if arranged at random, thereby preventing the luminance from being lowered.

5 is a perspective view of the retroreflective unit 11 further including a filling part 21.

The filling part 21 is formed by molding the outside of the retroreflective unit 11 illustrated in FIG. 1 into a synthetic resin that can transmit light, thereby forming the first and second bases of the retroreflective unit 11 ( 13b) and the reflective film 15 can be prevented from being damaged by an external impact. In addition, since the filling part 21 prevents the reflective film 15 from being exposed to air and moisture, the protective film 17 may not be formed. In addition, the filling unit 21 may be added a colorant (colorant) or a photoluminescent material.

6 is a perspective view of a full type retroreflective unit capable of retroreflecting light incident from both sides according to another exemplary embodiment of the present invention.

Pool-type retroreflective unit 31 according to another embodiment of the present invention is formed by combining two half-type retroreflective unit 11 shown in Figure 1 can be retroreflected light incident from both sides.

Therefore, the retroreflective unit 11 according to another embodiment of the present invention may retroreflect not only light incident from one side, that is, the upper direction, but also light incident from the other side, that is, the downward direction.

7A to 7E are plan views of polygonal retroreflective units according to still another exemplary embodiment of the present invention.

7A shows that the retroreflective unit 41 of the triangular structure is installed on the first base 43a of the triangle so that the second base 43b of the triangle reaches each vertex from the center, so that the inside has the same angle of 120 °. It consists of three cells 45 which have. In addition, the above-described retroreflective unit 41 of the triangular structure may be formed in a pool shape coupled up and down.

7B shows that the retroreflective unit 51 having a rectangular structure is diagonally installed on a rectangular first base 53a such that a triangular second base 53b extends from the center to each vertex. It consists of four cells 55 with an angle. In addition, the above-described retroreflective unit 51 having a rectangular structure may be formed in a pull shape coupled up and down.

7C shows that the retroreflective unit 61 of the pentagonal structure is installed on the first base 63a of the pentagon such that the triangular second base 63b reaches each vertex from the center so that the inside has the same angle of 72 °. It consists of five cells 65 which have. In addition, the reflex reflection unit 61 of the pentagonal structure described above may be formed in a pool shape coupled up and down.

7D shows that the retroreflective unit 71 of the hexagonal structure is installed on the first base 73a of the hexagon such that the triangular second base 73b reaches each vertex from the center thereof, so that the inside has the same angle of 60 °. It consists of six cells 75 which have. In addition, the above-described retroreflective unit 71 of the hexagonal structure may be formed in a pull shape coupled up and down.

7E shows that the retroreflective unit 81 of the octagonal structure is installed on the first base 83a of the octagon such that the triangular second base 83b reaches each vertex from the center thereof, and thus the inside has the same angle of 45 °. It consists of eight cells 85 having. In addition, the reflex reflection unit 81 of the above-described octagonal structure may be formed in a pull shape coupled up and down.

8a to 8g is a manufacturing process diagram of the retroreflective unit according to an embodiment of the present invention.

Referring to FIG. 8A, the resin layer 3 is formed on the carrier film 1. The resin layer 3 on the carrier film 1 is bonded to a silicone resin or a synthetic resin such as acrylic, urethane, polystyrene, polyethylene, polypropylin, polyvinyl alcohol, polyester, or the like. The low resin is formed by applying a thickness of about 100 μm to 5 mm by a method such as comma coating, reverse coating, gravure coating, braid coating, silk screen coating or slot die head coating.

8B and 8B ', the resin layer 3 is hardened or solidified by applying heat or irradiating light in a state in which the resin layer 3 is pressed by a mold (not shown). In the above, the mold has a structure in which a plurality of frame (not shown) structures are regularly arranged.

Then, the mold is removed from the resin layer 3 to form the first and second spaces 5 and 7. At this time, the 1st space 5 is formed in planar circular shape, and the protrusion part 9 which consists of resin which forms the resin layer 3 between the adjacent thing is formed. In addition, a plurality of second spaces 7 are formed so as to intersect at the center on the plane and have four equal angles of 90 degrees. Further, each of the second spaces 7 is formed to be perpendicular to the surface of the resin layer 3 and to form a fan shape inside and to have a width of about 20 μm to 1 mm.

8B 'is a cross-sectional view of the center of the second space 7 cut in the same process as that of FIG. 8B.

Although the first space 5 is formed in a circular shape and the plurality of second spaces 7 are formed in a fan shape inside the resin layer 3, the first space is formed in a polygon including a triangle and the second space is formed. The space may consist of right triangles. Thereby, the 2nd space 7 cross | intersects in planar center, and can be formed so that four may have not only the same angle of 90 degrees but many also have the same angle of 45-120 degrees.

Referring to FIG. 8C, silicon oxide or silicon nitride is formed on the surface of the resin layer 3 including the surfaces of the first and second spaces 5, 7 and the protrusions 9 by a method such as CVD or PECVD. The protective film 17 is formed by evaporating to a thickness of about 500 mW. Then, Al, Ag, Au, Cu, Zn, Pt, W, Ti, TiO2 or graphite is deposited on the protective film 17 by vacuum deposition, sputtering, CVD or PECVD, or plating to form 50 to 50. The reflective film 15 having a thickness of about 1000 mW is formed.

Referring to FIG. 8D, a silicone adhesive or a synthetic resin adhesive, for example, an acrylic adhesive, a polyvinyl chloride (PVC) adhesive, an epoxy adhesive, a urethane adhesive, a polystyrene adhesive, a polyethylene adhesive, a polypropylene adhesive on the reflective film 15 is illustrated. , Polyvinyl alcohol adhesive or polyester adhesive is applied. At this time, the coated resin is defined by the protrusion 9 to form a first base 13a in the first space 5 that forms a circular shape on a plane, and a second base 13b inside the second space 7. To form.

Referring to FIG. 8E, the carrier film 1 in which the reflective film 15 and the first and second bases 13a and 13b are formed by performing the process of FIGS. 8A to 8D is different from that of FIG. 8D. After the bases 13a are in contact with and attached to each other, the first and second bases 13a and 13b are heated or irradiated with light to cure or solidify to form the frame 13.

Referring to FIG. 8F, the carrier film 1 is removed to form the retroreflective unit 31 having the pull type structure illustrated in FIG. 6. Since the resin layer 3 is formed of a metal and a resin having low adhesion, the resin layer 3 is easily separated and removed from the protective film 17 when the carrier film 1 is separated. In addition, since only the protective film 17 and the reflective film 15 are present in the portion corresponding to the protrusion 9, the manufactured retroreflective unit 31 is easily separated from the adjacent one.

Referring to FIG. 8G, the filling part 33 may be formed by molding a synthetic resin that may transmit light to the outside of the full retroreflective unit 31. The filling part 33 is a colorant or photoluminescent light that prevents the first and second bases 13a and 13b and the reflective film 15 of the retroreflective unit 31 from being damaged by an external impact. Materials and the like can be added. In addition, since the filling part 33 prevents the reflective film 15 from being exposed to air and moisture, the protective film 17 may not be formed.

After the process shown in FIG. 8D, the first and second bases 13a and 13b are heated or irradiated with light to cure or solidify to form a frame 13, and the carrier film 1 is separated, as shown in FIG. 1. The half-shaped retroreflective unit 11 may be formed.

9A to 9F are manufacturing process diagrams of a retroreflective unit according to another exemplary embodiment of the present invention.

Referring to FIG. 9A, a separation layer 4 is formed on a carrier film 1a on which a hemispherical groove 2 having a diameter of about 100 μm to 5 mm is formed. In addition, the grooves 2 may be formed by a method such as comma coating, reverse coating, gravure coating, blade coating, silk screen coating, or slot die head coating, which may transmit light on the separation layer 4. It is applied to fill the filling portion 33 to form.

The groove 2 is formed in a hemispherical shape, but may be formed in a semi-polyhedron shape. The transparent resin for forming the filling part 33 may be a silicone adhesive, or a synthetic resin adhesive, for example, an acrylic adhesive, a PVC (polyvinyl chloride) adhesive, an epoxy adhesive, a urethane adhesive, a polystyrene adhesive, a polyethylene adhesive, a polypropyl It may be selected from a lean adhesive, a polyvinyl alcohol adhesive or an ester adhesive.

Referring to FIG. 9B, the filling part 33 is hardened or solidified by applying heat or irradiating light in a state in which the filling part 33 is pressed by a mold (not shown). In the above, the mold has a structure in which a plurality of frame (not shown) structures are regularly arranged.

Then, the mold is removed from the filling portion 33 to form the space 7a. In the above, a plurality of spaces 7a are formed so as to intersect at the center on the plane and have four equal angles of 90 °. In addition, each of the spaces 7a is formed so as to be perpendicular to the surface of the filling portion 33 to form a fan shape and have a width of about 20 μm to 1 mm.

Although the space 7a is described as being formed in a fan shape inside the filling part 33, it may be configured as a right triangle. That is, the space 7a may be formed in a fan shape when the groove 2 is formed in the carrier film 1a in a hemispherical shape, but may be configured as a right triangle in the case where it is formed in a semi-polyhedron.

In addition, the spaces 7a may be formed to have the same angle of 45 to 120 ° depending on the number. The spaces 7a are formed to have the same angle of 90 ° by crossing the spaces 7a from the center on the plane.

Referring to FIG. 9C, vacuum deposition, sputtering, CVD or PECVD of Al, Ag, Au, Cu, Zn, Pt, W, Ti, TiO 2 or graphite is performed on the surface of the filling part 33 including the space 7a. By vapor deposition or the like, or by plating, the reflective film 15 having a thickness of about 50 to 1000 mW is formed.

Referring to FIG. 9D, a silicone adhesive, or a synthetic resin adhesive, for example, an acrylic adhesive, a polyvinyl chloride (PVC) adhesive, an epoxy adhesive, a urethane adhesive, a polystyrene adhesive, a polyethylene adhesive, a polypropylene adhesive on the reflective film 15 is illustrated. , Polyvinyl alcohol adhesive or polyester adhesive is applied to form the frame 13 in the surface of the reflective film 15 and the space 7a.

Referring to FIG. 9E, the carrier film 1a on which the reflective film 15 and the base 13 are formed by the process of FIGS. 9A to 9D and the frame formed on the filling part 33 by the process of FIG. 13) are contacted and attached to each other and then hardened or solidified by applying heat or irradiating light.

Referring to FIG. 9F, the carrier film 1a is removed to form a reflex reflection unit 31 having a pull-type structure having a filling part 33 that protects the reflective film 15 from being damaged by an external impact. In the above, the carrier film 1a is easily separated from the filling part 33 by the separation layer 4.

As described above, the present invention is merely an embodiment, and the present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the technical spirit of the present invention. .

1 is a perspective view of a retroreflective unit according to an embodiment of the present invention.

2 is a plan view of FIG.

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a state diagram used in the half-type retroreflective unit according to an embodiment of the present invention.

5 is a perspective view of a retroreflective unit further comprising a filling unit.

6 is a perspective view of a full type retroreflective unit capable of retroreflecting light incident from both sides according to another embodiment of the present invention;

7A to 7E are plan views of polygonal retroreflective units according to still another exemplary embodiment of the present invention.

8a to 8g is a manufacturing process of the retroreflective unit according to an embodiment of the present invention.

9a to 9f is a manufacturing process diagram of a retroreflective unit according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1 carrier film 3 resin layer

5, 7: first and second spaces 9: protrusions

11, 31, 41, 51, 61, 71, 81: retroreflective unit

13: frame 17: protective film

13a, 43a, 53a, 63a, 73a, 83a: first base

13b, 43b, 53b, 63b, 73b, 83b: second base

5, 45, 55, 65, 75, 85: reflecting film

Claims (22)

delete delete delete delete delete delete delete delete delete delete delete Forming a resin layer on the first carrier film; Curing or solidifying the resin layer in a state in which a plurality of frame structures are pressed in a molding frame in which a plurality of frame structures are regularly arranged; The first space of the polygon defined by the protrusion formed between the adjacent ones on the resin layer by removing the mold, and the same angle at the center of the plane of the first space of the polygon comprising a circle or a triangle in the plane And forming a plurality of second spaces perpendicular to the surface of the resin layer and formed in a fan shape or a right triangle therein; Sequentially forming a protective film and a reflective film on the surface of the resin layer; And forming first and second bases filling the first and second spaces on the reflective film, respectively. The method according to claim 12, wherein the first and second base is cured or solidified and the first carrier film is removed together with the resin layer to separate the half-type retroreflective unit having the second frame formed only on the first frame. Method of manufacturing a retroreflective unit further comprising the step. The method according to claim 12, Forming first and second bases on a second carrier film including a resin layer by a separate process similar to the method of forming the first and second bases on the first carrier film; Attaching the first and second carrier films such that the respective first bases are in contact with each other and curing or solidifying the first and second bases on the second carrier film; And removing the first and second carrier films together with the respective resin layers to separate a pool type retroreflective unit having the second frame formed on the upper and lower portions of the first frame. Manufacturing method. The synthetic resin or silicone resin of claim 13 or claim 14, wherein the resin layer is made of acrylic, urethane, polystyrene, polyethylene, polypropylin, polyvinyl alcohol, or polyester with low adhesive strength to a thickness of 100 µm to 5 mm. Method for producing a retroreflective unit is formed by coating. The method of manufacturing a retroreflective unit according to claim 13 or 14, wherein the second space is formed to have a width of 20 µm to 1 mm. The method of manufacturing a retroreflective unit according to claim 13 or 14, wherein the protective film is formed by depositing silicon oxide or silicon nitride to a thickness of 50 to 500 kPa by the method of CVD or PECVD. 15. The method of claim 13 or 14, wherein the reflecting film is deposited by depositing Al, Ag, Au, Cu, Zn, Pt, W, Ti, TiO2 or graphite by vacuum deposition, sputtering, CVD or PECVD, or plating. A method for producing a retroreflective unit, which is formed to a thickness of ˜1000 mm 3. 15. The method according to claim 13 or 14, wherein the first and second bases are acrylic adhesives, polyvinyl chloride (PVC) adhesives, epoxy adhesives, urethane adhesives, polystyrene adhesives, polyethylene adhesives, polypropylene adhesives, polyvinyl alcohol adhesives or polyester adhesives. Method of manufacturing a retroreflective unit formed of a synthetic resin adhesive or a silicone adhesive. The method of manufacturing a retroreflective unit according to claim 13 or 14, further comprising forming a filling part by molding a synthetic resin that can transmit light on the passivation layer of the separated half or full retroreflective unit. Forming a separation layer on the first carrier film in which the hemispherical or semi-polyhedral groove is formed; Forming a filling part by applying a transparent synthetic resin to fill the groove on the separation layer; Hardening or solidifying the filling part in a state in which a plurality of frame structures are pressed by a mold in which a plurality of frame structures are regularly arranged; Removing the mold to form a plurality of spaces having the same angle at the center of the plane inside the filling part; Forming a reflective film on a surface of the filling part including the space; And forming a frame filling the space on the reflective film. The method according to claim 21, Forming a frame on the second carrier film by a separate process similar to the method of forming the frame on the first carrier film; Attaching the first and second carrier films such that the respective frames are in contact with each other and curing or solidifying the frame on the second carrier film; The method of manufacturing a retroreflective unit further comprising the step of removing the first and the second carrier film.

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