An apparatus and method for laser imaging on a flexible photosensitive film

Abstract

The present invention discloses an apparatus and a method for laser imaging on a flexible photosensitive film. The apparatus includes: an apparatus for laser imaging on a flexible photosensitive film, characterized by comprising: at least one set of laser light source modules, a rotatable optical path reflection unit, a baffle, an air-floating channel, and a computer; the baffle is provided with a through groove, an air flow is ejected in the air-floating channel, and the ejected air flow suspends the flexible photosensitive film in the air-floating channel; at least one laser beam emitted by at least one set of laser light source modules is incident on the rotatable optical path reflection unit, the rotatable optical path reflection unit reflects at least one laser beam side by side, and the at least one reflected laser beam passes through the through groove to expose the flexible photosensitive film row by row along the wide side in one row or simultaneously in multiple rows, and transfers the image stored in the computer onto the flexible photosensitive film. The present apparatus and method solve the problem that the flexible photosensitive film is not easy to be fixed and exposed due to its softness, and improve the exposure quality.

Description

Technical Field

[0001] The present invention belongs to the field of laser imaging, and particularly relates to an apparatus and method for laser imaging on a flexible photosensitive film. Background Art

[0002] Due to its light weight and paper-like shape, the flexible photosensitive film cannot be folded or overly bent. Moreover, the flexible photosensitive film is coated with photosensitive ink. If the photosensitive ink comes into frictional contact with other objects, it is likely to cause the photosensitive ink to fall off the film, affecting the exposure quality. Therefore, to directly image on the flexible photosensitive film, the following problems need to be solved: how to prevent the flexible photosensitive film from coming into contact and collision with other objects during the exposure process, resulting in the peeling off of the photosensitive glue coating thereon. Summary of the Invention

[0003] The present invention provides an apparatus and method for laser imaging on a flexible photosensitive film, aiming to solve the problem of poor exposure caused by the difficulty in fixing the flexible photosensitive film during laser imaging.

[0004] The solution of the present invention is as follows:

[0005] An apparatus for laser imaging on a flexible photosensitive film, characterized by comprising: at least one set of laser light source modules, a rotatable optical path reflection unit, a baffle, an air-floating channel, and a computer;

[0006] The baffle is provided with a through groove, and an air flow is sprayed in the air-floating channel. The sprayed air flow suspends the flexible photosensitive film in the air-floating channel;

[0007] At least one laser beam emitted by at least one set of laser light source modules is incident on the rotatable optical path reflection unit. The rotatable optical path reflection unit rotates reciprocally to reflect at least one laser beam side by side. The at least one reflected laser beam passes through the through groove to expose the flexible photosensitive film row by row along the wide side either in one row or simultaneously in multiple rows, transferring the image stored in the computer onto the flexible photosensitive film.

[0008] Preferably, the lower end of the baffle is provided with a convex upper mold with a smooth transition from two gradually curved surfaces on both sides to a convex arc surface in the middle. A plurality of first air intake through holes are evenly distributed on the baffle, and all the plurality of first air intake through holes lead directly to the convex upper mold. A plurality of air flows are sprayed downward from the plurality of first air intake through holes onto the upper surface of the flexible photosensitive film;

[0009] The upper end of the base is provided with a concave lower mold adapted to the convex upper mold. A plurality of second air intake through holes corresponding one by one to the plurality of first air intake through holes are evenly distributed on the base, and all the plurality of second air intake through holes lead directly to the concave lower mold. A plurality of air flows are sprayed upward from the plurality of second air intake through holes onto the lower surface of the flexible photosensitive film;

[0010] A number of downward jets and upward jets of air after adjusting the air pressure cause the object to be suspended in the air floating channel formed by the gap between the convex upper die and the concave lower die.

[0011] Preferably, the air pressures of a number of downward air jets are not the same, and the air pressures of a number of upward air jets are not the same.

[0012] Preferably, the width of the through groove is greater than n*d, where n is the number of laser light source modules, n≥1, and d is the cross-sectional diameter of the laser beam when passing through the through groove.

[0013] Preferably, the center line of the long side of the through groove and the center of the rotatable optical path reflecting unit are in the same plane.

[0014] Preferably, the rotatable optical path reflecting unit is a plane mirror or a regular polygon prism. The plane mirror or the regular polygon prism reciprocally rotates under computer control so that at least one laser beam exposes the flexible photosensitive film along the wide side direction of the plane mirror or along the thickness direction of the regular polygon prism.

[0015] Preferably, the regular polygon prism is a regular hexagon prism.

[0016] Preferably, the laser light source module includes: a laser light source, a collimating mirror, and at least one convex lens. The laser beam emitted by the laser light source is collimated by the collimating mirror and then incident on the convex lens in parallel. After passing through the convex lens, it is emitted to the rotatable optical path reflecting unit.

[0017] The present invention also discloses a method for exposing a flexible photosensitive film, including the following steps:

[0018] S1. Calculate the line spacing of each row of the image according to the resolution of the image to be exposed;

[0019] S2. Place the flexible photosensitive film in the air floating channel and make it float in an arc shape;

[0020] S3. The computer controls at least one laser light source module, the rotatable optical path reflecting unit, and the flexible photosensitive film to cooperate so that at least one laser beam exposes each row of the image on the flexible photosensitive film along the wide side.

[0021] Preferably, the specific steps of step S2 are:

[0022] S21: Place the flexible photosensitive film into the gap between the convex upper die and the concave lower die;

[0023] S22: By adjusting the air pressure magnitudes of a number of downward jets of air and a number of upward jets of air, make the flexible photosensitive film be in an arc-shaped floating state in the vertical direction and keep it all the time.

[0024] Advantageous technical effects of the present invention: Technical effects of the present device and method: By uniformly arranging a number of first air intake through-holes on the baffle plate that lead downward to the convex upper mold, and uniformly arranging a number of second air intake through-holes on the base that lead vertically upward to the concave lower mold; spraying a number of airflows downward through the number of first air intake through-holes onto the upper surface of the flexible photosensitive film, and spraying a number of airflows upward through the number of second air intake through-holes onto the lower surface of the flexible photosensitive film, the flexible photosensitive film is suspended in the air flotation channel formed by the gap between the convex upper mold and the concave lower mold under the combined action of the number of downward airflows and the number of upward airflows. At least one laser beam rotates under the rotating optical path reflection unit and exposes each row of images line by line along the concave arc surface of the wide side of the flexible photosensitive film until all rows of images are exposed. During the entire exposure process, a number of downward airflows and a number of upward airflows continuously act on the upper and lower surfaces of the flexible photosensitive film, and the part of the flexible photosensitive film in the air flotation channel always floats in a posture of bending into a circular arc along the wide side, avoiding the shedding of photosensitive ink caused by frictional contact with other objects and improving the exposure quality. Description of the Drawings

[0025] Figure 1 Schematic diagram of the module connection of the present invention;

[0026] Figure 2 For Figure 1 Exploded view of the baffle plate 4, flexible photosensitive film 8 and base 9 in

[0027] Figure 3 For Figure 2 View along direction B in

[0028] Figure 4 Schematic diagram of a laser beam 11 passing through the through-groove 41 (the first air intake through-hole 43 is omitted);

[0029] Figure 5 For Figure 1 Schematic diagram of the module connection of the present invention when the rotatable optical path reflection unit 3 is a plane mirror 3a;

[0030] Figure 6 For Figure 1 Schematic diagram of the module connection of the present invention when the rotatable optical path reflection unit 3 is a regular hexagonal prism 3b;

[0031] Figure 7 Schematic diagram of the flexible photosensitive film in the air flotation channel with its two wide sides slightly recessed inward to form an arc surface;

[0032] Figure 8 Schematic diagram of 3 laser beams 11 passing through the through-groove 41 along the wide side;

[0033] Figure 9Schematic diagram showing that both sides of the convex upper die 44 and the concave lower die 92 are smoothly transitioned from a gradually changing curved surface to an arc-shaped curved surface in the middle;

[0034] Figure 10 Schematic diagram showing that three laser beams 11 emitted by three groups of laser light source modules 1a are horizontally incident in a row along the width direction of the plane mirror 3a;

[0035] Figure 11 Schematic diagram showing that three laser beams 11 emitted by three groups of laser light source modules 1a are horizontally incident in a row along the thickness direction of the regular hexagonal prism 3a;

[0036] Figure 12 Schematic diagram showing that three laser beams simultaneously expose several rows of images of the flexible photosensitive film along the wide side direction. Detailed implementation manner

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first", "second", "third" are only used for description and distinction, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Refer to Figure 1 , Figure 1 which is a schematic structural connection diagram of the present invention. An apparatus for laser imaging on a flexible photosensitive film disclosed in the present invention includes: at least one group of laser light source modules 1a, a rotatable optical path reflection unit 3, a baffle 4, an air floating channel 5, and a computer 6. Refer to Figure 2, a through slot 41 is provided on the baffle 4 for at least one set of laser beams 11 emitted by at least one set of laser light source modules 1a to pass through and be used. Figure 1 The sectional view part of Figure 2 is obtained by a full section along the center line 42 of the long side of the through slot 41 in . Since there are no first air inlet through holes 43 and second air inlet through holes 91 on the A-A sectional view of the baffle 4, therefore, Figure 1 , Figure 5 and Figure 6 the first air inlet through hole 43 and the second air inlet through hole 91 cannot be seen in the sectional view parts of . Figure 1 In , several downward and upward airflows 7 are sprayed in the air floating channel 5. By adjusting the air pressure of several downward and upward airflows, the wide side part of the flexible photosensitive film 8 in the air floating channel is approximately in an arc shape. Regarding the concave surface of the flexible photosensitive film 8 as an arc surface with a fixed radius, that is, Figure 9 the MN part of the flexible photosensitive film 8 in . At least one laser beam 11 is incident on the rotatable optical path reflection unit 3. The rotatable optical path reflection unit 3 swings back and forth continuously under the control of the computer 6, and at least one reflected laser beam 11 passes through the through slot 41 of the baffle 4 in Figure 2 in a side-by-side manner (see Figure 4 and Figure 8 ), and exposes the concave arc surface of the flexible photosensitive film 8 in Figure 7 in a fan shape. Both sides of the flexible photosensitive film 8 are coated with photosensitive ink (not shown). The laser beam 11 exposes the photosensitive ink to print the graphics stored in the computer on the flexible photosensitive film 8. Refer to Figure 4 and Figure 8 . Since the width of the through slot 41 is designed to be greater than n*d, where n is the number of laser light source modules, which is also the number of laser beams, n≥1, and d is the cross-sectional diameter of each laser beam when passing through the through slot, the other parts of the baffle 4 are light-impermeable. The greater here should be understood as slightly greater than just allowing n laser beams 11 to pass through. To ensure that all n laser beams 11 can pass through the through slot 41 during fan-shaped scanning, it can be understood that the center of the rotatable optical path reflection unit 3 and the center line 42 of the long side of the through slot 41 are in the same plane to ensure that each row of images exposed by the laser beam is parallel to each other.

[0040] Refer to Figure 1 , Figure 2 and Figure 5 and Figure 6 . As one of the embodiments, the airflows 7 in the air floating channel 5 are formed by the gases ejected from the baffle 4 and the base 9. Refer to Figure 2 and Figure 3, on the upper end face of the baffle 4, a number of first air intake through holes 43 are evenly distributed. Each first air intake through hole 43 vertically penetrates downward directly to the convex upper die 44 on the lower end face of the baffle 4, where the two sides are gradually changing curved surfaces and smoothly transition to a convex arc surface in the middle. After the gas is pressurized, it is ejected downward from all the first air intake through holes 43 to form a number of airflows 7, and the number of airflows 7 is ejected onto the upper surface of the flexible photosensitive film 8; Refer to Figure 2 and Figure 3 , at the lower end of the base 9, a number of second air intake through holes 91 that correspond one by one to the number of first air intake through holes 43 are evenly distributed. Each second air intake through hole 91 directly leads upward to the concave lower die 92 on the upper end face of the base 9. When the gas is pressurized, it is ejected upward from the number of second air intake through holes 91 to form a number of upwardly ejected airflows 7, which are ejected onto the lower surface of the flexible photosensitive film 8. Therefore, there are a number of downwardly ejected and upwardly ejected airflows in the air floating channel 5. The downwardly ejected and upwardly ejected airflows are respectively ejected onto the upper and lower surfaces of the flexible photosensitive film 8. By adjusting the air pressures of the number of downwardly ejected airflows and the number of upwardly ejected airflows, the upper and lower surfaces of the flexible photosensitive film 8 can be balanced in force, and the wide side is suspended in an arc shape in the air floating channel 5 (see Figure 1 , Figure 2 and Figure 7 ). It should be noted that the air pressures of the number of airflows are not the same, that is, the air pressures of the airflows ejected downward from the number of first air intake through holes 43 in Figure 2 are not the same, and the air pressures of the number of airflows ejected upward from the second air intake through holes 91 are not the same. Only in this way can the wide side of the flexible photosensitive film 8 be suspended in an arc shape in the air floating channel.

[0041] It can be known from Figure 1 that the air floating channel 5 is formed by the gap between the convex upper die 44 with gradually changing curved surfaces on both sides and smoothly transitioning to a convex arc surface in the middle and the concave lower die 92. Refer to Figure 9 , for the schematic diagram of the two sides of the convex upper die 44 and the concave lower die 92 with gradually changing curved surfaces and smoothly transitioning to an arc surface in the middle. The convex upper die 44 transitions from a gradually changing smooth surface to an inner concave arc surface FG along the wide side direction of the flexible photosensitive film 8, and then to a gradually changing smooth surface GH. The gradually changing smooth surface EF mentioned here means that the surface radius Ra of the smooth surface EF is a variable, that is, the radius values of each point on the smooth surface EF are different. In the part of the inner concave arc surface FG, the radius value Rb of any point is the same. The gradually changing smooth surface GH is symmetric with respect to the central plane SS. Therefore, the radius value of the gradually changing smooth circular surface GH is also Ra. Therefore, the surface EH of the entire upper die is a smooth arc transition, and it is convex in the middle part. Refer to Figure 2 , matching the convex upper die, there is a concave lower die 92 arranged on the upper end face of the base 9. The upper surface of the concave lower die 92 is also in a smooth arc transition, that is,Figure 9 Here, IJ is a gradual changing surface, JK is a circular arc concave surface with a fixed radius, and KL is a gradual changing surface symmetrical to IJ with respect to the center plane SS.

[0042] refer to Figure 7 It should be noted that, since the material of the flexible photosensitive film 8 is relatively soft, it cannot be folded or greatly bent during the exposure process. When the flexible photosensitive film 8 is exposed in the air flotation channel 5, it can only be slightly bent inward along the wide side, so that a small part of the flexible photosensitive film 8 protrudes outward along the wide side in a roughly cylindrical shape, as shown in part c. Therefore, the shapes of the convex upper mold 44 and the concave lower mold 92 need to be consistent with the shape of the convex upper mold 44 and the concave lower mold 92. Figure 5 The c part of the flexible photosensitive film 8 is adapted.

[0043] It should be noted that, in the present application, the gas is preferably air, because air does not require cost. Air can be converted into airflow by a blower or other equipment. The gas may also be other gases, such as hydrogen, helium and argon, etc., which are not limited here.

[0044] The above-mentioned air flotation channel is only one embodiment. In fact, the structure of the air flotation channel can be implemented in many ways, but the ultimate goal is to suspend the flexible photosensitive film 8 in the gas to prevent the flexible photosensitive film 8 from contacting other objects, preventing collision and friction, and improving exposure quality.

[0045] It should be noted that the laser light source modules 1a can be one group or several groups. If the laser light source modules 1a have several groups, for example, three groups, see Figure 8 , then three laser beams are incident on the rotatable optical path reflection unit 3 in a row. After being reflected by the rotatable optical path reflection unit 3, the three laser beams simultaneously pass side by side along the wide side direction of the through slot 41, exposing multiple lines of images along the wide side of the flexible photosensitive film 8 in a fan shape. It can be understood that the three groups of laser light source modules 1a are arranged along the depth direction of the rotatable optical path reflection unit, that is, vertically from the paper surface to the inside. For example, when Figure 1 The embodiment of the rotatable light path reflection unit 3 is Figure 5 When the plane mirror 3a in Figure 10 , the light emitted by the three laser light source modules 1a is distributed in a row and incident horizontally on the width direction of the plane mirror 3a. Figure 1 The embodiment of the rotatable light path reflection unit 3 is Figure 6 When centering the hexagonal prism 3b, refer to Figure 11 , the three laser beams emitted by the three laser light source modules 1a are horizontally incident on one side of the regular hexagonal prism 3b along the thickness direction of the regular hexagonal prism 3b. Figure 7When exposing the flexible photosensitive film 8, 3 rows of images can be exposed at once along the wide side of the flexible photosensitive film 8. It should be noted that the above 3 groups are only exemplary, and can also be set to 2 groups, 4 groups, 5 groups or other numbers of groups to improve the exposure efficiency.

[0046] Reference Figure 1 , Figure 5 and Figure 6 , as one of the embodiments, the laser light source module 1a includes: a laser light source 1, a collimating mirror 12 and at least one convex lens 3. The laser beam 11 emitted by the laser light source 1a is collimated by the collimating mirror 12 and then incident parallel to the convex lens 3. After passing through the convex lens 3, it is emitted to the rotatable optical path reflection unit 3.

[0047] Reference Figure 1 and Figure 2 , when there is 1 laser light source module 1a, after the rotatable optical path reflection unit 3 drives the laser beam 11 to expose one row of images in a fan shape along the wide side of the flexible photosensitive film 8, the computer controls the laser light source module 1a to pause emitting light, and then controls the flexible photosensitive film 8 to advance a pixel distance along the long side. That is to say, the advancing direction of the flexible photosensitive film 8 is perpendicular to the fan-shaped scanning plane formed by the laser beam. During the movement of the flexible photosensitive film 8 along the long side, the computer 6 controls the laser light source 1 not to emit light. The method of controlling the movement of the flexible photosensitive film 8 along the long side direction is, for example, several rotating rollers (not shown) can be set in the two long side directions of the flexible photosensitive film 8, and the flexible photosensitive film 8 is driven to move in the long side direction by controlling the rotation of the several rotating rollers. When the laser light source module 1a is Figure 8 , Figure 10 , Figure 11 shown in the exemplary 3, reference Figure 12 , the computer 6 (see Figure 1 ) controls the 3 laser light source modules 1a to simultaneously move along Figure 11The wide side of the flexible photosensitive film 8 shown is simultaneously exposed to the three rows of images A11, A21, and A31 in the first group. After the exposure is completed, the computer 6 controls the three laser light source modules 1a to stop emitting light, then controls the flexible photosensitive film 8 to move a pixel distance along the long side. The computer 6 controls the three laser light source modules 1a to emit light, and exposes the three rows of images A12, A22, and A32 in the first group. After the exposure is completed, the computer 6 controls the three laser light source modules 1a to stop emitting light, continues to control the flexible photosensitive film 8 to move a pixel distance along the long side, the computer 6 controls the three laser light source modules 1a to emit light, and exposes the three rows of images A13, A23, and A33 in the first group. Then, the computer 6 controls the flexible photosensitive film 8 to move a distance of six pixel points along the long side (the line spacing between adjacent two rows of images is equal to the size of one pixel point), so that the first of the three laser light source modules 1a contacts the A11 row of the second group, and then the three laser light source modules 1a expose the second group of images in the same way as the images in the first group are exposed. And so on, when the number of laser light source modules 1a is n (n≥1), the number of rows of images exposed by the two laser beams emitted by every two adjacent laser light source modules 1a on the flexible photosensitive film 8 has an interval of t rows, and the diameter of the pixel points of the image to be exposed is u. Then after the n laser beams expose the first group of n*t rows of images, the computer controls the n laser light source modules to pause emitting light, and controls the flexible photosensitive film 8 to move a distance of (n - 1)*t*u along the long side direction, and then exposes the second group of n*t rows of images; after the second group of n*t rows of images are exposed, the computer controls the n laser light source modules to pause emitting light, and controls the flexible photosensitive film 8 to move a distance of (n - 1)*t*u along the long side direction, and exposes the third group of n*t rows of images until all the rows of images divided along the wide side on the flexible photosensitive film are exposed.

[0048] Reference Figure 5 , Figure 5 is Figure 1 the schematic connection diagram of the module where the rotatable optical path reflection unit 3 is a plane mirror 3a in []. In this embodiment, the rotatable optical path reflection unit 3 is a plane mirror 3a. Under the control of the computer 6, the plane mirror 3a vibrates back and forth reciprocally, so that the laser beam 11 emitted by the laser light source module 1a exposes the images on the flexible photosensitive film 8 row by row in a fan-shaped manner left and right. Reference Figure 6 , another embodiment of the rotatable optical path reflection unit 3 is a regular hexagon prism, Figure 1 the laser beam 11 emitted by the laser light source module 1a in [] is incident on one side of the regular hexagon prism and exits from the other side of the regular hexagon prism. When the regular hexagon prism rotates along its central axis, the emitted laser beam 11 exposes the images on the flexible photosensitive film 8 row by row in a fan-shaped manner back and forth. It should be noted that the regular hexagon prism is only exemplary, and it can also be other regular polygon prisms such as a regular pentagon prism, a regular octagon prism, and an equilateral triangle prism.

[0049] The present invention also discloses a method for exposing a flexible photosensitive film by using the above device, comprising the following steps:

[0050] S1. Calculate the line spacing of each row of the image according to the resolution of the image to be exposed;

[0051] S2. Place a part of the flexible photosensitive film in the air-floating channel and make it float in an arc shape;

[0052] S3. The computer controls the laser light source module, the rotatable optical path reflection unit and the flexible photosensitive film to act cooperatively, so that at least one laser beam exposes each row of images on the flexible photosensitive film along the wide side.

[0053] In step S1, once the resolution of the image to be exposed is determined, the size of each pixel can be determined. The image to be exposed is divided into several rows, and the line spacing between every two adjacent rows of images is the size of one pixel.

[0054] In step S2, by adjusting the air pressures of the downward and upward airflows ejected in the air-floating channel, the upper and lower surfaces of the flexible photosensitive film 8 are subjected to two impact forces, downward and upward. The two impact forces finally form a resultant force to make the flexible photosensitive film 8 float in the air-floating channel, so that the flexible photosensitive film 8 does not contact other objects during the exposure process, preventing the photosensitive ink on it from falling off and improving the exposure quality.

[0055] In step S2, the method for placing the flexible photosensitive film in the air-floating channel and making it float is as follows: Refer to Figure 3 , first, place the flexible photosensitive film 8 between the convex upper mold 44 and the concave spherical lower mold 92, and then blow several downward airflows (see the several downward arrows in Figure 1 ) through several first air inlet channels 43, and eject several upward airflows (see the several upward arrows in Figure 1 ) through several second air inlet channels 91. By adjusting the magnitudes of the upward and downward airflows, the several downward airflows and the several upward airflows suspend that part of the flexible photosensitive film 8 in the air-floating channel 5 composed of the convex spherical upper mold 44 and the concave spherical lower mold 92, and keep its wide side in an arc shape until that part of the flexible photosensitive film 8 is completely exposed, preventing the flexible photosensitive film 8 from being not easily fixed due to its soft material during the exposure process and improving the exposure quality.

[0056] In step S3, the cooperative action here refers to: Refer to Figure 1 and Figure 2, when there is 1 laser light source module 1a, the rotatable optical path reflection unit 3 drives the laser beam 11 to expose one row of images in a fan shape along the wide side of the flexible photosensitive film 8. After that, the computer controls the laser light source module 1a to stop emitting light, and then controls the flexible photosensitive film 8 to move forward by the distance of one pixel along the long side. That is to say, the advancing direction of the flexible photosensitive film 8 is perpendicular to the fan-shaped scanning plane formed by the laser beam. During the movement of the flexible photosensitive film 8 along the long side, the computer 6 controls the laser light source 1 not to emit light. The method of controlling the movement of the flexible photosensitive film 8 along the long side is, for example, several rotating rollers (not shown) can be arranged in the two long side directions of the flexible photosensitive film 8, and the flexible photosensitive film 8 is driven to move in the long side direction by controlling the rotation of the several rotating rollers. When the number of laser light source modules 1a is Figure 8 , Figure 10 , Figure 11 shown as the exemplary 3, referring to Figure 12 , the computer 6 (see Figure 1 ) controls the 3 laser light source modules 1a to simultaneously expose the first group of 3 rows of images A11, A21, and A31 along the wide side of the flexible photosensitive film 8 shown in Figure 11 . After the exposure, the computer 6 controls the 3 laser light source modules 1a to stop emitting light, then controls the flexible photosensitive film 8 to move one pixel distance along the long side, the computer 6 controls the 3 laser light source modules 1a to emit light, and exposes the first group of 3 rows of images A12, A22, and A32. After the exposure, the computer 6 controls the 3 laser light source modules 1a to stop emitting light, continues to control the flexible photosensitive film 8 to move one pixel distance along the long side, the computer 6 controls the 3 laser light source modules 1a to emit light, and exposes the first group of 3 rows of images A13, A23, and A33. Then, the computer 6 controls the flexible photosensitive film 8 to move 6 pixel points along the long side (the line spacing between adjacent two rows of images is equal to the size of one pixel point), so that the first one of the 3 laser light source modules 1a touches the A11 row of the second group, and then the 3 laser light source modules 1a expose the second group of images in the same way as the images of the first group. And so on, when the number of laser light source modules 1a is n (n≥1), the number of rows of images exposed by the two laser beams emitted by every two adjacent laser light source modules 1a on the flexible photosensitive film 8 has an interval of t rows, and the diameter of the pixel points of the image to be exposed is u. Then after the n laser beams expose the first group of n*t rows of images, the computer controls the n laser light source modules to pause emitting light, and controls the flexible photosensitive film 8 to move a distance of (n - 1)*t*u along the long side direction, and then exposes the second group of n*t rows of images; after exposing the second group of n*t rows of images, the computer controls the n laser light source modules to pause emitting light, and controls the flexible photosensitive film 8 to move a distance of (n - 1)*t*u along the long side direction, and exposes the third group of n*t rows of images, until all the rows of images divided along the wide side on the flexible photosensitive film are exposed.

[0057] It should be noted that steps S1 - S3 do not necessarily represent a specific sequence. In some cases, appropriate adjustment of the order also falls within the scope of protection of this patent application.

[0058] Technical effects of the present device and method: By uniformly arranging a number of first air intake through - holes on the baffle plate that lead downward to the convex upper die, and uniformly arranging a number of second air intake through - holes on the base that lead vertically upward to the concave lower die; injecting a number of airflows downward through the number of first air intake through - holes onto the upper surface of the flexible photosensitive film, and injecting a number of airflows upward through the number of second air intake through - holes onto the lower surface of the flexible photosensitive film. Under the combined action of the number of downward airflows and the number of upward airflows, the flexible photosensitive film floats in the air - floating channel formed by the gap between the convex upper die and the concave lower die. At least one laser beam, under the rotation of the rotatable optical path reflection unit, exposes each row of images row by row along the concave arc surface of the wide side of the flexible photosensitive film until all rows of images are exposed. During the entire exposure process, the number of downward airflows and the number of upward airflows continuously act on the upper and lower surfaces of the flexible photosensitive film. The part of the flexible photosensitive film in the air - floating channel always floats in a posture of bending into an arc along the wide side, avoiding the shedding of photosensitive ink caused by frictional contact with other objects and improving the exposure quality.

[0059] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An apparatus for laser imaging on a flexible photosensitive film, characterized in that, Comprising: At least one set of laser light source modules, a rotatable optical path reflection unit, a baffle, a base, an air floatation channel and a computer; The baffle is provided with a through slot, an air flow is ejected in the air floatation channel, and the air flow suspends the flexible photosensitive film in the air floatation channel; At least one laser beam emitted by the at least one set of laser light source modules is incident on the rotatable optical path reflection unit, and the rotatable optical path reflection unit reciprocally rotates under the control of the computer to reflect the at least one laser beam side by side, and the reflected at least one laser beam passes through the through slot and exposes the flexible photosensitive film row by row along the wide side in one row or multiple rows, and transfers the image stored in the computer onto the flexible photosensitive film; The lower end of the baffle is provided with a convex upper mold with a smooth transition from gradually changing curved surfaces on both sides to a convex arc-shaped curved surface in the middle. A plurality of first air inlet through holes are evenly distributed on the baffle, and the plurality of first air inlet through holes all lead directly to the convex upper mold, and a plurality of air flows are ejected downward from the plurality of first air inlet through holes onto the upper surface of the flexible photosensitive film; The upper end of the base is provided with a concave lower mold adapted to the convex upper mold. A plurality of second air inlet through holes corresponding one by one to the plurality of first air inlet through holes are evenly distributed on the base, and the plurality of second air inlet through holes all lead directly to the concave lower mold, and a plurality of air flows are ejected upward from the plurality of second air inlet through holes onto the lower surface of the flexible photosensitive film; The plurality of air flows ejected downward and the plurality of air flows ejected upward suspend the flexible photosensitive film in the air floatation channel formed by the gap between the convex upper mold and the concave lower mold; The air pressures of the plurality of air flows ejected downward are not all the same, and the air pressures of the plurality of air flows ejected upward are not all the same.

2. The device according to claim 1, characterized in that, The width of the through slot is greater than n*d, where n is the number of the laser light source modules, n≥1, and d is the cross-sectional diameter of the laser beam when passing through the through slot.

3. The device according to claim 1, characterized in that The center line along the long side direction of the through slot and the center of the rotatable optical path reflection unit are in the same plane.

4. The device according to any one of claims 1 to 3, characterized in that The rotatable optical path reflection unit is a plane mirror or a regular polygon prism, and the plane mirror or the regular polygon prism reciprocally rotates under the control of the computer so that the at least one laser beam exposes the flexible photosensitive film along the wide side direction of the plane mirror or along the thickness direction of the regular polygon prism.

5. The device according to claim 4, wherein, The regular polygon prism is a regular hexagon prism.

6. The device according to claim 1, characterized in that, The laser light source module includes: a laser light source, a collimating mirror and at least one convex lens. The laser beam emitted by the laser light source is collimated by the collimating mirror and then incident on the convex lens in parallel, and after passing through the convex lens, it is emitted to the rotatable optical path reflection unit.

7. A method for exposing a flexible photosensitive film using the device according to any one of claims 1-6, characterized in that, Including the following steps: S1. Calculate the line spacing of each row of the image according to the resolution of the image to be exposed; S2. Place the flexible photosensitive film in the air floatation channel and make it float in an arc shape; S3. The computer controls the laser light source module, the rotatable optical path reflection unit and the flexible photosensitive film to cooperate so that the at least one laser beam exposes each row of the image on the flexible photosensitive film along the wide side.

8. The method according to claim 7, wherein The specific steps of step S2 are: S21: Place the flexible photosensitive film into the gap between the convex upper mold and the concave lower mold; S22: By adjusting the air pressure of several downward jet airflows and the air pressure of several upward jet airflows, make the flexible photosensitive film in an arc-shaped suspended state in the vertical direction and keep it all the time.

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