Laser transfer device and laser transfer method

Abstract

An embodiment of the present invention may provide a laser transfer device and a laser transfer method, the laser transfer device comprising: a stage on which an object is located; a laser generation unit for generating a laser beam to irradiate a predetermined position; a fixing unit for bringing a transfer film into close contact with the object and fixing same in place; and a jig unit which is made of a material through which the laser beam can pass, has a predetermined thickness, and is placed on an upper surface of the transfer film fixed by the fixing unit such that the jig unit covers the transfer film.

Description

Laser transfer device and laser transfer method

[0001] The present invention relates to a laser transfer device and a laser transfer method.

[0002]

[0003] Transfer technology is a technology that transfers desired images, patterns, inks, materials, etc., from one medium to another target substrate, and is widely used in various industrial fields such as graphic arts, textile printing, and electronic device manufacturing.

[0004] Depending on the method, such transfer methods include thermal transfer, which uses heat to attach a transfer material to the surface of a substrate; pressure transfer, which applies mechanical pressure to transfer a transfer layer to an object; wet transfer, which uses a solvent or adhesive to move a pattern or functional material; dry transfer, which transfers material using adhesion, electrostatic force, heat treatment, etc. in a solid state; inkjet or digital transfer, which is a printing-based precision transfer method; and laser transfer, which moves material locally using laser energy.

[0005] Among these laser transfer technologies, conventional laser transfer technology forms a transfer layer on a substrate and deposits an absorption layer thereon. Subsequently, it is a technology in which the transfer layer is heated using a laser beam to move vertically and settle onto the transfer target, and it is performed as a relatively precise and non-contact process.

[0006] However, since the transfer is performed using a non-contact process, there are problems such as difficulty in precise positional alignment, scattering of the transfer material, difficulty in controlling transfer uniformity, unstable adhesion between the transfer material and the substrate, and the generation of floating residues as some material floats around during the non-contact transfer process.

[0007]

[0008] The purpose of the present invention is to provide a laser transfer device capable of precise positional alignment and a laser transfer method in order to solve the technical problem that the present invention aims to achieve.

[0009] The purpose is to provide a laser transfer device and a laser transfer method that prevent scattering of transferred materials and enable uniform transfer.

[0010] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems can be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0011]

[0012] A laser transfer device according to one embodiment of the present invention is,

[0013] A stage where the object is located;

[0014] A laser generating unit that generates a laser beam and irradiates the laser beam at a predetermined location;

[0015] A fixing part for fixing a transfer film in close contact with the above-mentioned object; and

[0016] It may include a jig portion that is provided with a predetermined thickness of a material through which the laser beam is transmitted, and is positioned on the upper surface of the transfer film fixed by the fixing portion to cover the transfer film.

[0017] According to one embodiment of the present invention,

[0018] The above jig part is,

[0019] A heater that generates heat by supplying power may be included.

[0020] According to one embodiment of the present invention,

[0021] The above heater is,

[0022] The above transfer film can be preheated by generating heat.

[0023] According to one embodiment of the present invention,

[0024] The thickness of the above jig part is,

[0025] The following mathematical formula 1 can be satisfied.

[0026] [Mathematical Formula 1]

[0027] D ∝ f(Q3, T3, T2) - f(T1)

[0028] (Here, D is the thickness of the jig portion, Q3 is the amount of thermal energy transferred per unit time at the interface between the jig portion and the transfer film, T1 is the temperature of the surrounding environment, T2 is the temperature of the jig portion, and T3 is the temperature of the interface between the jig portion and the transfer film)

[0029] According to one embodiment of the present invention,

[0030] The thickness of the above jig part is,

[0031] The amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film is proportional to the temperature of the jig part and the temperature of the interface between the jig part and the transfer film, and may be proportional to the difference excluding the influence of the ambient temperature.

[0032] According to one embodiment of the present invention,

[0033] The following mathematical formula 2 can be satisfied.

[0034] [Mathematical Formula 2]

[0035] f(Q3, T3) ∝ f(Q1, T1) ∝ f(laser power, overlap, 1 / scan speed, repeat count)

[0036] (Here, Q1 is heat introduced by the laser, Q3 is the amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film, T1 is the temperature of the ambient environment, and T3 is the temperature of the interface between the jig part and the transfer film)

[0037] According to one embodiment of the present invention,

[0038] The amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film and the temperature at the interface between the jig part and the transfer film may be proportional to the heat introduced by the laser and the external temperature.

[0039] According to one embodiment of the present invention,

[0040] The temperature of the interface of the above transfer film may be proportional to the heat introduced by the laser and the external temperature, which may be proportional to the laser output and the degree of laser overlap.

[0041] According to one embodiment of the present invention,

[0042] It may include a supply unit that supplies at least one transfer film to the stage.

[0043] According to one embodiment of the present invention,

[0044] The above transfer film is,

[0045] A base that acts as a support and maintains its shape;

[0046] A protective layer provided on the above base layer and protecting the ink layer from external stimuli;

[0047] An ink layer transferred to the above-mentioned object; and

[0048] It may include a primer layer that improves the adhesion of the ink to facilitate adhesion to the above-mentioned object.

[0049] According to one embodiment of the present invention,

[0050] The above base is,

[0051] The above laser beam can be made of a heat-resistant material that allows for transmission.

[0052] According to one embodiment of the present invention,

[0053] The above ink layer is,

[0054] It may include a paint that can change color depending on the laser wavelength.

[0055] According to one embodiment of the present invention,

[0056] The above ink layer is,

[0057] It may include a paint capable of changing color by one or more of energy per unit area and pulse overlap rate.

[0058] According to one embodiment of the present invention,

[0059] The above laser beam is,

[0060] It can be provided as a flat-top laser beam.

[0061] According to one embodiment of the present invention,

[0062] The above laser beam is,

[0063] It can be provided with one or more of a nanosecond laser beam, a femtosecond laser beam, and a picosecond laser beam.

[0064] According to one embodiment of the present invention,

[0065] It may include a scanning unit that photographs the transferred object and compares it with reference shape and color data.

[0066] According to one embodiment of the present invention,

[0067] The surface of a predetermined location of the object can be modified by irradiating the object with a laser.

[0068] According to one embodiment of the present invention,

[0069] The above transfer film is,

[0070] At least one layer can be provided in a shape corresponding to the shape to be transferred.

[0071] According to one embodiment of the present invention,

[0072] The above at least one layer may include the ink layer.

[0073] A laser transfer method according to one embodiment of the present invention is,

[0074] Preparation step for positioning the object on the stage;

[0075] A supply step of supplying a transfer film so that it is positioned on the upper part of the object;

[0076] A bonding step of bringing the above-mentioned object and the above-mentioned transfer film into close contact with each other;

[0077] A transfer step of transferring by irradiating a laser beam at a predetermined location of the transfer film adhered in the above adhesion step; and

[0078] It may include a detachment step of detaching the transfer film from the object.

[0079] According to one embodiment of the present invention,

[0080] The above contact step is,

[0081] It may include a pressing step of covering the upper surface of the transfer film in close contact with the object with a jig part and applying pressure.

[0082] According to one embodiment of the present invention,

[0083] The above preparation step is,

[0084] It may include a surface modification step of modifying the surface by irradiating the laser beam at the transfer location of the above-mentioned object.

[0085] According to one embodiment of the present invention,

[0086] The above supply step is,

[0087] A sequential supply step of supplying at least one transfer film separated by color, each according to a predetermined order, may be further included.

[0088] According to one embodiment of the present invention,

[0089] The above exit step is,

[0090] It may include an inspection step of photographing the object and comparing it with reference shape and color data to determine whether there is an abnormality.

[0091] According to one embodiment of the present invention,

[0092] The above inspection step is,

[0093] It may include a repetition step that is repeatedly performed from the supply step to the departure step to correspond to the reference shape and color data.

[0094]

[0095] According to one embodiment of the present invention, a laser transfer device capable of precise positional alignment and a laser transfer method can be provided.

[0096] According to one embodiment of the present invention, a laser transfer device and a laser transfer method capable of preventing scattering of the transferred material and enabling uniform transfer can be provided.

[0097]

[0098] FIG. 1 is a perspective view of a stage and a fixing part according to one embodiment of the present invention, and

[0099] FIG. 2 is a schematic diagram of a laser transfer device according to one embodiment of the present invention, and

[0100] FIG. 3 is a schematic diagram of a laser transfer device excluding a laser generator in one embodiment of the present invention.

[0101] FIG. 4 is a drawing showing the operation of adhering an object and a transfer film according to one embodiment of the present invention, and

[0102] FIG. 5 is a diagram showing the configuration of a transfer film according to one embodiment of the present invention, and

[0103] FIGS. 6 and 7 are drawings illustrating the process of a transfer film adhering to and being transferred to an object according to an embodiment of the present invention, and

[0104] FIG. 8 is a drawing showing a state transferred by a plurality of transfer films to an object according to one embodiment of the present invention, and

[0105] FIGS. 9 and 10 are flowcharts of a laser transfer method according to an embodiment of the present invention.

[0106]

[0107] Hereinafter, an embodiment of a laser transfer device and a laser transfer method according to the present invention will be described in detail with reference to the attached drawings.

[0108] It should be noted that when assigning reference numerals to the components of each drawing, the same components are assigned the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0109] In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by such terms. Furthermore, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0110]

[0111] Embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0112] A laser transfer device according to FIGS. 1 to 8 may include a stage (120) on which an object (10) is positioned, a laser generating unit (110) that generates a laser beam (L) and irradiates the laser beam at a predetermined position, a fixing unit (130) that fixes the transfer film (20) in close contact with the object (10), and a jig unit (150) that is provided with a material through which the laser beam is transmitted and has a predetermined thickness, and is positioned on the upper surface of the transfer film (20) fixed by the fixing unit to cover the transfer film (20).

[0113] An object (10) can be positioned and fixed on a stage (120), and a fixing part (130) can press a transfer film (200) against the object (10) positioned on the stage (120), and a jig part (150) can cover and press the transfer film on the upper surface of the transfer film (20). When the object (10) and the transfer film (20) are in close contact with each other and the transfer film (20) is pressed by the jig part, the laser generating part (110) can irradiate the laser beam (L) at a predetermined location. When the laser beam (L) is irradiated at the predetermined location, a transfer target object can be transferred from the transfer film (20) to the object (10). Here, the transfer target object may be the ink of the ink layer (23) described later, but is not limited thereto.

[0114]

[0115] The object (10) may be a variety of substrates such as plastic or metal, but is not limited thereto.

[0116] Here, the transfer film (20) may include a base (21) that acts as a support and maintains its shape, a protective layer (22) provided on the base layer (21) and protecting the ink layer (23) from external stimuli, an ink layer (23) that is transferred to the target (10), and a primer layer (24) that improves the adhesion of the ink layer (23), but is not limited thereto, and the arrangement of each layer may be determined by the choice of a person skilled in the art.

[0117] The transfer film (20) may include a base layer (21). The base layer (21) may be made of a heat-resistant and smooth-surfaced material and may serve as a support for the transfer film (20). The base (21) may support and protect other layers and maintain a shape recognized during the processing process. The base layer (21) may be made of a transparent or laser (L)-transmittable material, and preferably may be made of polyethylene terephthalate, but is not limited thereto.

[0118] A protective layer (22) may be provided on one side of the base (21). The protective layer (22) may be made of a thin, flexible material that is transparent or translucent, and the protective layer (22) may protect the ink layer (23), which will be described later, from external stimuli. Here, external stimuli may refer to heat or friction, but are not limited thereto.

[0119] An ink layer (23) may be provided on one side of the protective layer (22). The ink layer (23) may be transferred to another substrate in response to one or more of heat and pressure. The ink layer (23) may include a design, character, and pattern of the object (10), but may be determined by the choice of a person skilled in the art. Here, the ink layer (23) may include a paint that can change color according to a laser wavelength, and may also include a paint that can change color according to one or more of energy per unit area and pulse overlap rate, so that the paint of the ink layer (23) changes to a predetermined color and is transferred by a change in the output of the laser beam (L), etc. Here, depending on the case, the ink layer (23) may be formed on the transfer film (20) in correspondence with the pattern or shape to be transferred.

[0120]

[0121] A primer layer (24) may be provided on the transfer film (20). The primer layer (24) may be provided on one side of the ink layer (23). The primer layer (24) may be provided on one side of the ink layer (23) to act as a binder to improve the adhesion of the ink to the object (10), or may be included between the base (21) and the ink layer (23) to assist the adhesion so that the ink layer (23) adheres well to the base (21). The primer layer (24) may be provided to improve adhesion and reinforce the durability and flexibility of the transferred ink.

[0122] The transfer film (20) may have at least one layer formed corresponding to the shape to be transferred. Preferably, the layer formed corresponding to the shape to be transferred may have at least an ink layer (23) formed to correspond to the shape to be transferred, but is not limited thereto; a base (21), a protective layer (22), and a primer layer (24) may also be formed to correspond to the shape to be transferred. To form a shape corresponding to the shape to be transferred within the transfer film, it may be formed by printing technology or laser processing technology. Printing can form the shape to be transferred by precisely printing at a specific location on the transfer film. In addition, laser processing technology can form the shape by processing the surface of the transfer film using a laser beam. A transfer film in which a predetermined shape is realized by printing or laser processing in this way can be accurately aligned with the contour of the shape to be transferred during laser transfer, thereby increasing energy transfer and transfer efficiency.

[0123]

[0124] At least one layer of the transfer film (20) is transferred according to a predetermined shape by a laser beam, so that the predetermined shape can be transferred to the target (10).

[0125]

[0126] The laser transfer device may include a transfer unit (not shown) that transfers an object (10) to a stage (120). The transfer unit may place and move the object (10). The transfer unit may place or move the object to an appropriate position. The object (10) may be transferred to a position where it can receive a laser beam (L) irradiated from a laser generator (110) so that the object (10) can be transferred by a laser (L) generated from a laser generator (110). Preferably, the transfer unit may transfer the object (10) to a stage (120), but is not limited thereto. The transfer unit (10) adjusts the position of the object (10) so that the laser (L) irradiated from the laser generator (110) can be accurately irradiated to the transfer position of the object (10), and when the transfer of the transfer target of the transfer film (20) to the object (10) is completed, the object (10) may be transferred to a predetermined position.

[0127]

[0128] A stage (120) can be positioned so that an object (10) can be placed thereon. The stage (120) can be positioned so that a laser (L) irradiated from a laser generator (110) can be irradiated onto the object (10), and a lifting unit (not shown) is provided so that when a transfer film (20) is supplied, the stage can be raised to position the object (10) close to the transfer film (20).

[0129]

[0130] The laser transfer device may include a supply unit that supplies at least one transfer film (20) to the stage (120). The supply unit (140) may supply the transfer film (20). Here, the transfer film (20) may be provided in a roll or sheet form with a predetermined color or a predetermined shape pattern formed thereon. If necessary, at least one transfer film (20) supplied by the supply unit (140) may be provided, and if multiple colors are required for the patterns, characters, and designs to be transferred to the object (10), multiple transfer films (20) having each color may be supplied sequentially in order. Each of the multiple transfer films (20) may be provided with an ink layer (23) of a different color, and may be transferred sequentially to transfer the predetermined patterns, characters, and designs to the object (10). Here, the supply unit (140) may further include a guide unit (not shown) or a vision system (not shown) to minimize the positional error of the transfer film (20).

[0131]

[0132] The fixing part (130) can be positioned and fixed so that the transfer film (20) is in close contact with the object (10) located on the stage (120). More specifically, the fixing part (130) may be provided with a gripping part (131) for gripping the transfer film (20), a gripping part lifting part (133) for raising and lowering the gripping part (131) where the gripping part (131) is positioned, and a roller part (132) for completely contacting the transfer film (20) and the object (10). The gripping part (131) can grip the transfer film (20), and when the object (10) is positioned close to the transfer film (20) gripped by the gripping part (131) by at least one of the lifting part of the stage (120) and the gripping part lifting part (133), the roller part (132) can roll over the transfer film (20) to completely press the object (10) and the transfer film (20) together.

[0133]

[0134] The jig portion (150) is provided with a transparent or translucent material through which a laser can pass, and can cover and press the transfer film (20) in close contact with the object (10). The jig portion (150) can be provided with a predetermined thickness, preferably with a thickness of 1 mm or more, but is not limited thereto. Additionally, the jig portion (150) may be provided with a heater (not shown) that generates heat by supplying power. The heater may be embedded inside the jig portion (150), and as the heater is provided to be embedded, the jig portion (150) may generate heat through the heat generated by the heater and transfer heat to the transfer film (20). By arranging the jig portion (150) to generate heat and transfer heat to the transfer film (20), the transfer film (20) is heated and preheated before the laser beam is irradiated to perform the transfer, thereby enabling transfer even with a lower output laser and flattening the temperature distribution of the transfer film (20) to provide more uniform transfer quality. Additionally, by preheating the transfer film (20), damage to the transfer film (20) caused by rapid thermal expansion by the laser beam is prevented, and the time required to reach the target temperature is reduced, thereby shortening the laser irradiation time and shortening the transfer time.

[0135] Additionally, the thickness of the jig portion (150) may be proportional to the amount of thermal energy transferred per unit time at the interface between the jig portion (150) and the transfer film (20), the temperature of the jig portion (150), and the temperature at the interface between the jig portion (150) and the transfer film (20), and may be proportional to the difference excluding the influence of the ambient temperature. As the ambient temperature increases, the temperature gradient may become smaller, and as the temperature gradient becomes smaller, the heat transfer efficiency decreases, and accordingly, correction may be required according to the external temperature.

[0136] Here, when D is the thickness of the jig portion (150), Q3 is the amount of thermal energy transferred per unit time at the interface between the jig portion (150) and the transfer film (20), T1 is the temperature of the surrounding environment, T2 is the temperature of the jig portion (150), and T3 is the temperature of the interface between the jig portion (150) and the transfer film (20), the following [Equation 1] can be satisfied.

[0137] [Mathematical Formula 1]

[0138] D ∝ f(Q3, T3, T2) - f(T1)

[0139]

[0140] The thickness of the jig portion (150) may be proportional to the amount of thermal energy transferred per unit time at the interface between the jig portion (150) and the transfer film (20), and may also be proportional to the temperature of the jig portion (150) and the temperature of the interface between the jig portion (150) and the transfer film (20). That is, the higher the amount of thermal energy transferred per unit time at the interface between the jig portion (150) and the transfer film (20), the thicker the thickness of the jig portion (150) may be provided; the higher the temperature of the jig portion (150), the thicker the thickness of the jig portion (150) may be provided; or the higher the temperature of the interface between the jig portion (150) and the transfer film (20), the thicker the thickness of the jig portion (150) may be provided. In addition, it goes without saying that the thickness of the jig part (150) can be made thinner as the amount of thermal energy transferred per unit time at the interface between the jig part (150) and the transfer film (20) is small, the temperature of the jig part (150) is low, or the temperature of the interface between the jig part (150) and the transfer film (20) is low.

[0141]

[0142] When the jig unit (130) covers the transfer film (20) and presses the target (10) and the transfer film (20), a laser beam (L) can be irradiated at a predetermined location from the laser generating unit (110). The laser generating unit (110) can generate a laser beam (L) so that the ink of the transfer film (20) is transferred to the target (10). Specifically, a continuous wave laser or a pulsed laser can be used. The wavelength of the laser beam (L) can be any laser wavelength located within the infrared region to the ultraviolet region. For example, it may include ultraviolet wavelengths, green wavelengths, infrared wavelengths, etc. The laser beam (L) generated by the laser generating unit (110) can pass through the head unit (111).

[0143] The head unit (111) can adjust the size or shape of the laser beam (L) generated by the laser generator (110). Specifically, the head unit (110) can enlarge or reduce the laser beam (L). Additionally, the head unit (111) can generate the laser beam (L) into a parallel collimated beam with minimal dispersion or concentration. Thus, the laser beam generated by the laser generator (110) passes through the head unit (111), is enlarged or reduced to adjust its size, and can be generated and irradiated as a collimated beam.

[0144] The head unit (111) can change the diameter of the laser beam generated by the laser generator and output the changed laser beam. The head unit (111) may be adjustable manually or automatically. Here, the head unit (111) can convert the shape of the Gaussian beam into a flat-top laser beam or a multi-spot shape and output it. The shape of the flat-top beam may be one of a circular, polygonal, or ring shape.

[0145] The laser irradiated from the laser generating unit (110) can be arranged so that the overlap of the laser beam (L) is minimized, and preferably, the laser beam (L) can be irradiated as a flat-top laser beam to minimize the overlap of the laser beam (L) and the laser can be irradiated onto the transfer film (20). In addition, the laser beam (L) can be irradiated as one or more laser beams among a nano-second laser beam, a femto-second laser beam, and a pico-second laser beam, but is not limited thereto.

[0146] In addition, the laser generating unit (110) may further be equipped with various optical elements such as a beam converter, a beam attenuator, a polarizer, a half-wave plate, a splitter, a filter, and a shutter.

[0147] In some cases, the laser generating unit (110) may include a line beam conversion module (not shown) that converts the laser beam into a line beam. A line beam conversion module is provided to convert the irradiated laser into a line beam.

[0148]

[0149] The laser transfer device may include a scanning unit (not shown) that photographs the transferred object (10) and compares it with reference shape and color data. The scanning unit may be provided as a photographing device that photographs the corresponding area after the transfer of the object (10) is completed, and may include an image processing unit that processes the photographed image data and compares it with reference shape and color data to inspect for any abnormalities by comparing it with the reference shape and color data. Here, the photographing device may be provided as a CCD, CMOS, or other high-sensitivity image sensor, but is not limited thereto. The image processing unit may extract location, shape, size, and color information of the transfer pattern within the acquired image and compare and analyze it with previously stored reference data, thereby determining whether the shape of the transfer pattern matches, color accuracy, the presence of foreign substances, damage, and non-uniformity.

[0150]

[0151] The amount of thermal energy transferred per unit time at the interface between the jig portion (150) and the transfer film (20), and the temperature of the interface between the jig portion (150) and the transfer film (20), may be proportional to the heat introduced by the laser and the external temperature. Additionally, the temperature of the interface of the transfer film (20), the heat introduced by the laser, and the external temperature may be proportional to the laser output and the degree of laser overlap.

[0152] Here, when Q1 is heat introduced by the laser, Q3 is the amount of thermal energy transferred per unit time at the interface between the jig part (150) and the transfer film (20), T1 is the temperature of the surrounding environment, and T3 is the temperature of the interface between the jig part (150) and the transfer film (20), the following [Equation 2] can be satisfied.

[0153] [Mathematical Formula 2]

[0154] f(Q3, T3) ∝ f(Q1, T1) ∝ f(laser power, overlap, 1 / scan speed, repeat count)

[0155] According to the above [Equation 2], the thermal energy transferred at the interface and the interface temperature can be proportional to the laser output and the external temperature. In addition, the interface temperature can be proportional to the laser output and the degree of laser overlap.

[0156]

[0157] FIGS. 9 and 10 are flowcharts of a laser transfer method according to an embodiment of the present invention.

[0158] A laser transfer method according to FIGS. 9 and 10 may include a preparation step (S100) of positioning an object (10) on a stage (120), a supply step (S200) of supplying a transfer film (20) so that it is positioned on top of the object (10), a contact step (S300) of bringing the object (10) and the transfer film (20) into close contact with each other, a transfer step (S400) of transferring by irradiating a laser beam (L) at a predetermined position of the transfer film (20) that was brought into contact in the contact step (S300), and a detachment step (S500) of removing the transfer film (20) from the object (10).

[0159]

[0160] First, the laser transfer method may perform a preparation step (S100) in which an object (10) to be transferred is positioned on a stage (120) provided in a laser transfer device. At this time, the stage (120) may be configured to fix the object and enable precise position control, and may prevent the object (10) from moving during the transfer process so that transfer can be performed at an accurate position. The object (10) may be various substrates such as plastic or metal, and a cleaning or drying process may be performed prior to ensure surface cleanliness before transfer.

[0161] In some cases, when the preparation step (S100) is performed, a surface modification step (S110) may be included in which the laser beam (L) is irradiated at the transfer location of the object (10) to modify the surface. The surface modification step (S110) changes the roughness, energy state, or chemical properties of the surface at the location to be transferred to the object (10), thereby improving the adhesion of the transfer target to the transfer film (200) in the subsequent transfer step (S400) to be performed, and increasing the transfer efficiency and the precision of the transfer pattern. Additionally, surface modification can prevent transfer defects and improve durability and adhesion reliability.

[0162]

[0163] After the preparation step (S100) is performed, a supply step (S200) can be performed next, in which a transfer film (20) is supplied so that it is positioned on the upper surface of the target (10). The transfer film (20) may be provided in a roll or sheet form with a predetermined color or a predetermined shape pattern formed thereon, and may be supplied precisely by the supply unit (140) of the laser transfer device so that it is aligned to a position on the upper surface of the target (10). The supply unit (140) of the laser transfer device may include a guide (not shown) or a vision system (not shown) to minimize positional error of the transfer film (20) so that the transfer film (20) is positioned at a predetermined location. Additionally, the supply step (S200) may further include a sequential supply step in which a plurality of transfer films are supplied individually according to a predetermined order. In cases where multiple colors are required for transfer, multiple transfer films (20), each separated into one of the multiple colors, may be supplied sequentially according to a predetermined order so that multiple colors can be transferred to the target object (10). Here, the sequential supply step may be performed by the repetition step described later after the transfer film (20) supplied earlier is removed in the removal step (S500) described later, and it is preferable that the transfer film (20) prepared according to the predetermined order is supplied after the transfer film (20) supplied earlier is removed.

[0164]

[0165] Afterward, a contact step (S300) can be performed so that the supplied transfer film (20) is sufficiently in contact with the target (10). In this step, mechanical contact between the transfer film (20) and the target (10) can be strengthened by the roller part (132) of the laser transfer device. By bringing the target (10) and the transfer film (20) into close contact with each other, heat transfer efficiency and transfer quality can be improved during laser irradiation.

[0166] Additionally, the adhesion step may further include a pressing step (S310) in which a jig part (150) covers and presses the transfer film (20) that is in contact with the object (10). The jig part (150) may cover the upper surface of the transfer film (20) that is in contact with the object (10), and by the jig part (150) covering the upper surface of the transfer film (20), the transfer film (20) and the object (10) may be pressed by the weight of the jig part (150), and the transfer film (20) and the object (10) may be more closely attached by this pressing.

[0167] When the contact step (S300) is completed, a transfer step (S400) can be performed to transfer a transfer target onto an object (10) by irradiating a laser beam (L) at a predetermined location on the transfer film (20). The laser beam (L) can be controlled with a specific wavelength, output, and irradiation time, and the transfer film (20) receives energy from the laser beam (L), so that the transfer target, i.e., the ink of the ink layer (23), can be transferred onto the surface of the object (10). At this time, to ensure a more uniform energy distribution and stable transfer quality, a flat-top laser beam (L) irradiated from the laser generator (110) may be used. A flat-top laser maintains uniform intensity within the irradiation area and minimizes laser overlap, thereby minimizing deformation or damage to the transfer pattern and enabling precise transfer. In some cases, after irradiating the laser beam (L) at a predetermined location, the outer edge of the predetermined shape can be cut. By cutting the outer edges to create sharp outlines, transfer quality can be further enhanced.

[0168]

[0169] When the transfer step (S400) is performed, a detachment step (S500) for separating the transfer film (20) from the object (10) may be performed. The detachment step (S500) may detach the jig part (150) that presses the transfer film (20), mechanically peel off the transfer film (20), or recover it using a roll (not shown) of the supply part (140), but is not limited thereto. The detachment step (S500) may be performed quickly and uniformly so as not to affect the quality of the transferred area where the transfer is completed, and if necessary, a post-processing process to remove residue or contamination may be performed together. The detachment step (S500) may include an inspection step (S600) for photographing the object (10) and comparing it with reference shape and color data to determine whether there are any abnormalities. Through the inspection step (S600), the transfer quality can be verified, and if a defect occurs, immediate process adjustment or follow-up processing measures can be performed. The inspection step (S600) can improve the reliability and efficiency of the entire process by continuously managing the entire quality and enabling a response in the event of a defect.

[0170]

[0171] The inspection step (S600) may include a repetition step (610) that repeats a series of processes from the supply step (S200) to the detachment step (S500) to correspond to the reference shape and color data. The repetition step (610) may repeat the steps of supply, adhesion, transfer, detachment, and inspection in order to sequentially transfer each of the pattern and multiple colors of the transfer film (200) to the object (10). Through the repetition step (610), the reference shape and color can be transferred accurately and uniformly to the object (10), and the transfer status can be inspected at each repetition to determine whether there is an abnormality in real time.

[0172]

[0173] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0174] The scope of the present invention is defined by the claims set forth below, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.

Claims

1. A stage where the object is located; A laser generating unit that generates a laser beam and irradiates the laser beam at a predetermined location; A fixing part for fixing a transfer film in close contact with the above-mentioned object; and A laser transfer device comprising: a jig portion provided with a predetermined thickness in a material through which the laser beam is transmitted, and disposed on the upper surface of the transfer film fixed by the fixing portion to cover the transfer film.

2. In Paragraph 1, The above jig part is, A laser transfer device equipped with a heater that generates heat by supplying power.

3. In Paragraph 2, The above heater is, A laser transfer device that generates heat to preheat the transfer film.

4. In Paragraph 1, The thickness of the above jig part is, A laser transfer device satisfying the following [Mathematical Formula 1]. [Mathematical Formula 1] D ∝ f(Q3, T3, T2) - f(T1) (Here, D is the thickness of the jig portion, Q3 is the amount of thermal energy transferred per unit time at the interface between the jig portion and the transfer film, T1 is the temperature of the surrounding environment, T2 is the temperature of the jig portion, and T3 is the temperature of the interface between the jig portion and the transfer film) 5. In Paragraph 4, The thickness of the above jig part is, A laser transfer device, wherein the amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film is proportional to the temperature of the jig part and the temperature at the interface between the jig part and the transfer film, and is proportional to the difference excluding the influence of the ambient temperature.

6. In Paragraph 1, A laser transfer device satisfying the following mathematical formula 2. [Mathematical Formula 2] f(Q3, T3) ∝ (Q1, T1) ∝ f(laser power, overlap, 1 / scan speed, repeat count) (Here, Q1 is heat introduced by the laser, Q3 is the amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film, T1 is the temperature of the ambient environment, and T3 is the temperature of the interface between the jig part and the transfer film) 7. In Paragraph 6, A laser transfer device in which the amount of thermal energy transferred per unit time at the interface between the jig part and the transfer film and the temperature at the interface between the jig part and the transfer film are proportional to the heat introduced by the laser and the external temperature.

8. In Paragraph 6, A laser transfer device in which the temperature of the interface of the above-mentioned transfer film is proportional to the heat introduced by the laser and the external temperature is proportional to the laser output and the degree of laser overlap.

9. In Paragraph 1, A laser transfer device comprising: a supply unit that supplies at least one transfer film to the stage.

10. In Paragraph 1, The above transfer film is, A base that acts as a support and maintains its shape; A protective layer provided on the above base layer and protecting the ink layer from external stimuli; An ink layer transferred to the above-mentioned object; and A laser transfer device comprising: a primer layer that improves the adhesion of ink to facilitate adhesion to the above-mentioned object.

11. In Paragraph 10, The above base is, A laser transfer device made of a heat-resistant material that allows the laser beam to pass through.

12. In Paragraph 10, The above ink layer is, A laser transfer device comprising a paint capable of changing color depending on the laser wavelength.

13. In Paragraph 10, The above ink layer is, A laser transfer device comprising a paint capable of changing color by one or more of energy per unit area and pulse overlap rate.

14. In Paragraph 1, The above laser beam is, A laser transfer device provided with one or more of a nanosecond laser beam, a femtosecond laser beam, or a picosecond laser beam.

15. In Paragraph 1, A laser transfer device comprising: a scanning unit that photographs the transferred object and compares it with reference shape and color data.

16. In Paragraph 1, A laser transfer device that irradiates a laser onto an object to modify the surface of a predetermined location on the object.

17. In Paragraph 10, The above transfer film is, A laser transfer device having at least one layer formed in a shape corresponding to the shape to be transferred.

18. In Paragraph 17, A laser transfer device comprising at least one layer including the ink layer.

19. Preparation step for positioning the object on the stage; A supply step of supplying a transfer film so that it is positioned on the upper part of the object; A bonding step of bringing the above-mentioned object and the above-mentioned transfer film into close contact with each other; A transfer step of transferring by irradiating a laser beam at a predetermined location of the transfer film adhered in the above adhesion step; and A laser transfer method comprising: a detachment step of detaching the transfer film from the target.

20. In Paragraph 19, The above contact step is, A laser transfer method comprising a pressing step of pressing the upper surface of the transfer film in close contact with the object by covering it with a jig portion.

21. In Paragraph 19, The above preparation step is, A laser transfer method comprising: a surface modification step of modifying the surface by irradiating the laser beam at the transfer location of the above-mentioned object.

22. In Paragraph 19, The above supply step is, A laser transfer method further comprising a sequential feeding step of supplying at least one transfer film separated by color to each other in a predetermined order.

23. In Paragraph 22, The above exit step is, A laser transfer method comprising: an inspection step of photographing the object and comparing it with reference shape and color data to determine whether there is an abnormality.

24. In Paragraph 23, The above inspection step is, A laser transfer method comprising: a repeating step of repeatedly performing steps from the supply step to the departure step to correspond to reference shape and color data.

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