A packaging substrate exposure method and device

Abstract

The present invention discloses a packaging substrate exposure method and device, which relates to the field of substrate exposure and solves the problem of troublesome film replacement in existing exposure machines. The method comprises an exposure machine housing and a control panel installed at the front end of the exposure machine housing, wherein a conveyor line body is installed through the interior of the exposure machine housing, a motor is fixedly installed at the top inner top of the exposure machine housing, and an ultraviolet lamp cover is fixedly provided on the output shaft of the motor through a mounting plate; a switching mechanism is installed at the bottom of the ultraviolet lamp cover for quickly switching the film required for exposure. The present invention cooperates with the switching mechanism, the transmission component and the reversing component. When the user needs to replace the film, he only needs to rotate the two storage covers half a circle by the motor. During the rotation, the exposure film spliced ​​by multiple PCB circuit board films can be moved, and the position between the PCB circuit board films can be replaced, so that the exposure film can be quickly replaced.

Description

Technical Field

[0001] The present invention relates to the field of substrate exposure, and in particular to a packaging substrate exposure method and device. Background Art

[0002] The PCB substrate, that is, the inner circuit board, needs to be exposed and developed before packaging. The exposure is done by ultraviolet light passing through the film in a certain shape and irradiating the copper surface of the inner circuit board covered with a photosensitive film. The part of the photosensitive film exposed by ultraviolet light will solidify on the copper surface of the inner circuit board, and the unexposed part will fall off after washing with water. At this time, the board with the cured photosensitive film will be etched and then subjected to film stripping. At this time, the inner circuit pattern will be transferred to the board.

[0003] During the exposure process of circuit boards, the UV-blocking film inside the existing exposure equipment needs to be frequently replaced according to the different batches and models of the circuit boards. Since the exposure equipment in the factory is large, the shell of the large exposure machine needs to be opened and replaced when replacing the film, which is very troublesome. Therefore, we propose a packaging substrate exposure method and device. Summary of the Invention

[0004] The object of the present invention is to provide a packaging substrate exposure method and device capable of quickly replacing a film, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A packaging substrate exposure device comprises an exposure machine housing and a control panel installed at the front end of the exposure machine housing, a conveyor line body is installed through the interior of the exposure machine housing, a motor is fixedly installed at the top inner end of the exposure machine housing, and an ultraviolet lamp cover is fixed to the output shaft of the motor through a mounting plate; a switching mechanism, which can quickly switch the film required for exposure, is installed at the bottom of the ultraviolet lamp cover; an identification mechanism, which can observe the switching state of the switching mechanism, is installed between the exposure machine housing and the switching mechanism, wherein the circuit board moves from the upper end of the conveyor line body to the lower end of the ultraviolet lamp cover for exposure processing.

[0007] Preferably, the switching mechanism includes storage covers symmetrically installed inside the exposure machine housing, and a central shaft is rotatably installed inside the two storage covers, an exposure film is movably embedded between the two storage covers, and both ends of the exposure film are fixedly wound on the outer surface of the central shaft, and the winding directions of the two ends of the exposure film are opposite, a frame is fixedly installed on the top of the two storage covers, and the frame is fixedly connected to the ultraviolet lamp cover, a guide frame is fixedly installed between the two storage covers, and the exposure film is slidably engaged with the guide frame, and a transmission assembly is installed between the central shaft and the exposure machine housing, and when the two storage covers rotate half a circle, the exposed part of the exposure film can be replaced through the transmission assembly.

[0008] Preferably, the transmission assembly includes a fixed ring fixedly suspended and hoisted to the inside of the exposure machine shell by a plurality of suspension rods, and a plurality of dial columns distributed in a circular array are fixedly installed on the lower end of the fixed ring, a twisted arc bar sphere 1 is fixedly installed on one end of the central axis, and a twisted arc bar sphere 2 is installed on the end of the storage cover away from the twisted arc bar sphere 1, the twisted arc bar sphere 2 and the twisted arc bar sphere 1 are symmetrically distributed, and both are movably engaged with the dial column, and a reversing assembly is installed between the twisted arc bar sphere 2 and the central axis. When the two storage covers rotate, the two groups of twisted arc bar spheres 2 and twisted arc bar spheres 1 can be rotated synchronously through the movably engaging of the plurality of dial columns with the twisted arc bar sphere 2 and the twisted arc bar sphere 1.

[0009] Preferably, the reversing assembly includes a limiting shell fixedly mounted on an end of the storage cover away from the twisted arc sphere, and a rotating shaft is rotatably mounted inside the limiting shell, a transmission belt 1 is installed between the rotating shaft and the central shaft through a rotating wheel, and a connecting shaft is fixedly mounted on an end of the twisted arc sphere 2 close to the storage cover, and the connecting shaft is rotatably embedded in the interior of the limiting shell, and gears are fixedly mounted on the outer surfaces of the connecting shaft and the rotating shaft, and the two gears are movably engaged, wherein when the twisted arc sphere 2 rotates, the direction of the connecting shaft can be changed through two mutually meshing gears, and the cooperation of the transmission belt 1 and the rotating shaft, so that the direction in which the twisted arc sphere 2 rotates the central shaft is consistent with the direction in which the twisted arc sphere 1 rotates the central shaft.

[0010] Preferably, the marking mechanism includes a rotating shaft rotatably mounted on the inner wall of the fixed ring through a mounting seat, and the rotating shaft and the outer surface of the output end of the motor are installed with a transmission belt 2 through a rotating wheel 2, and the outer surfaces of the suspension rod and the rotating shaft are both sleeved with synchronous wheels, and the synchronous wheels are fixedly connected to the rotating shaft and rotatably connected to the suspension rod, and the outer sides of several synchronous wheels are installed with synchronous belts, and the outer surface of the synchronous belt is fixedly installed with several equidistantly distributed marking hemispheres, and an observation component is installed between the exposure machine housing and the synchronous belt, and the marking hemispheres should have color markings or symbol markings so that users can observe them.

[0011] Preferably, the observation component includes a fixed frame fixedly embedded in the front end of the exposure machine housing, a slot is provided inside the fixed frame, and the rear end of the slot is aligned with the synchronous belt, a transparent plate is fixedly installed on the front end of the fixed frame, and a brightening light group is provided on the inner wall of the slot, and the transparent plate is made of transparent acrylic material. Compared with glass, transparent acrylic material has stronger toughness, is not easy to break, and is cheap.

[0012] Preferably, the exposure film is formed by splicing together multiple PCB circuit films, so when the exposed part of the exposure film is replaced, the position between the multiple PCB circuit films is actually replaced.

[0013] Preferably, the distance between two adjacent marking hemispheres is equal to half the circumference of the synchronous wheel, so as to ensure that after the synchronous wheel rotates half a circle following the motor, its marking hemisphere can accurately move to the rear end of the slot.

[0014] A packaging substrate exposure method comprises the following steps:

[0015] S1: Film switching stage. Before exposing other batches of circuit boards, the control panel controls the motor to drive the UV lampshade and the frame to rotate half a circle. Under the action of the transmission assembly and the reversing assembly, the exposure film moves under the action of the two central axes. Since the exposure film is spliced ​​together from multiple PCB circuit films, one PCB circuit film can be replaced each time the exposure film moves.

[0016] S2: linkage stage, each time the motor drives the UV lampshade to rotate half a circle, the second transmission belt can drive the shaft to rotate, so that the synchronous belt can transmit a certain distance. At this time, the status of the exposed film can be observed through the marking hemisphere on the surface of the synchronous belt;

[0017] S3: Observation stage, the user can observe the marking hemisphere on the surface of the synchronous belt through the transparent plate, wherein the brightening light group can increase the brightness inside the fixed frame, making it easier for the user to observe.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention utilizes a switching mechanism, a transmission assembly, and a reversing assembly to drive the two storage housings to rotate half a circle via the motor's output end through the frame. During the rotation, the rotating column engages with the first and second twisted arc spheres, allowing the central axis inside one storage housing to reel in one end of the exposure film while the central axis inside the other storage housing releases the other end of the exposure film. This allows the exposed portion of the exposure film to be switched. The switching essentially involves switching between multiple PCB films. The previously used PCB film is reeled into the storage housing while the next PCB film is loaded, enabling rapid film replacement.

[0020] 2. The present invention utilizes the functions of the marking mechanism and the observation assembly. During the half-turn rotation of the output end of the motor, the synchronous belt can be driven to shift by the cooperation of the second transmission belt and the synchronous pulley. After the movement is completed, the user can observe the marking hemispheres on the surface of the synchronous belt through the notch and the transparent plate. Based on the information provided by the different marking hemispheres, the user can understand the PCB circuit board film with the exposed portion of the film at this time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of the exposure machine housing of the present invention;

[0023] Figure 3 This is a schematic diagram of the fixing ring structure of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the twisted arc sphere 1 and the twisted arc sphere 2 of the present invention;

[0025] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0026] Figure 6 This is a schematic diagram of the exposure film structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the synchronous wheel and synchronous belt of the present invention;

[0028] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0029] Figure 9 This is a schematic diagram of the positional relationship between the UV lampshade and the exposure film of the present invention;

[0030] Figure 10 This is a schematic diagram of the hemispherical structure of the present invention.

[0031] In the figure: 1-exposure machine housing; 2-control panel; 3-conveyor line; 4-motor; 5-UV lamp cover; 6-switching mechanism; 7-transmission assembly; 8-marking mechanism; 9-observation assembly; 10-reversing assembly; 11-storage cover; 12-fixing ring; 13-synchronizing wheel; 14-synchronizing belt; 15-suspender; 16-frame; 17-guide frame; 18-exposure film; 19-center axis; 20-twisted arc sphere 1; 21-turn column; 22-limiting housing; 23-twisted arc sphere 2; 24-connecting shaft; 25-rotating shaft; 26-gear; 27-transmission belt 1; 28-transmission belt 2; 29-marking hemisphere; 30-fixing frame; 31-transparent plate; 32-brightening lamp group; 33-rotating shaft. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] See also Figure 1 and Figure 2 The figure shows a packaging substrate exposure device, which includes an exposure machine housing 1 and a control panel 2 installed at the front end of the exposure machine housing 1. A conveyor line body 3 is installed inside the exposure machine housing 1, and a motor 4 is fixedly installed at the top of the interior of the exposure machine housing 1, and the output shaft of the motor 4 is fixed with an ultraviolet lamp cover 5 through a mounting plate; a switching mechanism 6, which can quickly switch the film required for exposure, is installed at the bottom of the ultraviolet lamp cover 5; an identification mechanism 8, which can observe the switching state of the switching mechanism 6, is installed between the exposure machine housing 1 and the switching mechanism 6, wherein the circuit board moves from the upper end of the conveyor line body 3 to the lower end of the ultraviolet lamp cover 5 for exposure processing.

[0035] See also Figure 3 、 Figure 4 and Figure 6In the figure, the switching mechanism 6 includes storage covers 11 symmetrically installed inside the exposure machine housing 1, and a central shaft 19 is rotatably installed inside the two storage covers 11. An exposure film 18 is movably embedded between the two storage covers 11, and both ends of the exposure film 18 are fixedly wound on the outer surface of the central shaft 19. The winding directions of the two ends of the exposure film 18 are opposite. A frame 16 is fixedly installed on the top of the two storage covers 11, and the frame 16 is fixedly connected to the ultraviolet lamp cover 5. A guide frame 17 is fixedly installed between the two storage covers 11, and the exposure film 18 is slidably engaged with the guide frame 17. A transmission assembly 7 is installed between the central shaft 19 and the exposure machine housing 1. When the two storage covers 11 rotate half a circle, the exposed part of the exposure film 18 can be replaced through the transmission assembly 7.

[0036] See also Figure 4 、 Figure 7 and Figure 8 In the figure, the transmission assembly 7 includes a fixed ring 12 fixedly hoisted to the inside of the exposure machine housing 1 by a number of hoisting rods 15, and a number of dial columns 21 distributed in a circular array are fixedly installed on the lower end of the fixed ring 12. A twisted arc ball 20 is fixedly installed at one end of the central axis 19, and a twisted arc ball 23 is installed at the end of the storage cover 11 away from the twisted arc ball 20. The twisted arc ball 23 and the twisted arc ball 1 20 are symmetrically distributed, and both are movably engaged with the dial column 21. A reversing assembly 10 is installed between the twisted arc ball 23 and the central axis 19. When the two storage covers 11 rotate, the two groups of twisted arc ball 23 and twisted arc ball 1 20 can be rotated synchronously through the movably engagement of the number of dial columns 21 with the twisted arc ball 23 and the twisted arc ball 1 20.

[0037] See also Figure 4 and Figure 5 In the figure, the reversing assembly 10 includes a limiting shell 22 fixedly mounted on the end of the storage cover 11 away from the twisted arc ball 20, and a rotating shaft 25 is rotatably installed inside the limiting shell 22, and a transmission belt 27 is installed between the rotating shaft 25 and the central shaft 19 through a rotating wheel 1. The twisted arc ball 23 is fixedly mounted on the end close to the storage cover 11, and the connecting shaft 24 is rotatably embedded in the interior of the limiting shell 22. Gears 26 are fixedly mounted on the outer surfaces of the connecting shaft 24 and the rotating shaft 25, and the two gears 26 are movably engaged. When the twisted arc ball 23 rotates, the direction of the connecting shaft 24 can be changed through the cooperation of two mutually meshing gears 26, the transmission belt 1 27 and the rotating shaft 25, so that the direction in which the twisted arc ball 23 rotates the central shaft 19 is consistent with the direction in which the twisted arc ball 20 rotates the central shaft 19.

[0038] See also Figure 6 In the figure, the exposure film 18 is made up of multiple PCB circuit films. Therefore, when the exposed part of the exposure film 18 is replaced, the position between the multiple PCB circuit films is actually replaced.

[0039] A packaging substrate exposure method comprises the following steps:

[0040] S1: Film switching stage. Before exposing other batches of circuit boards, the control panel 2 controls the motor 4 to rotate the UV lamp cover 5 and the frame 16 half a circle. Under the action of the transmission assembly 7 and the reversing assembly 10, the exposure film 18 moves under the action of the two central shafts 19. Since the exposure film 18 is made of multiple PCB circuit films, each time the exposure film 18 moves, one PCB circuit film can be replaced.

[0041] S2: linkage stage, each time the motor 4 drives the UV lamp cover 5 to rotate half a circle, the second transmission belt 28 can drive the shaft 33 to rotate, so that the synchronous belt 14 can be driven a certain distance. At this time, the status of the exposed film 18 can be observed through the marking hemisphere 29 on the surface of the synchronous belt 14;

[0042] S3: Observation stage, the user can observe the marking hemisphere 29 on the surface of the timing belt 14 through the transparent plate 31, wherein the brightening light group 32 can increase the brightness inside the fixing frame 30, making it easier for the user to observe.

[0043] The working principle of the film can be quickly replaced: under the conveying line 3 of the circuit board, the circuit board can be moved to the bottom of the ultraviolet lamp cover 5, and the exposure film 18 is located between the two. Under the action of the ultraviolet light emitted by the ultraviolet lamp cover 5, the copper surface of the circuit board can be exposed. Since the exposure film 18 is made up of multiple PCB circuit board films, when the PCB circuit board films need to be replaced, the user only needs to use the output end of the motor 4 to drive the two storage covers 11 to rotate half a circle through the frame 16. During the rotation, the dial column 21 is used to rotate the two storage covers 11. The movable engagement with the twisted arc sphere 1 20 and the twisted arc sphere 2 23 can make the central axis 19 inside one of the storage cover shells 11 reel in one end of the exposure film 18, while the central axis 19 inside the other storage cover shell 11 loosens the other end of the exposure film 18, so that the exposed part of the exposure film 18 can be switched. The essence of switching is the switching of multiple PCB circuit board films. The previously used PCB circuit board film is rolled up into the interior of the storage cover shell 11, and the other PCB circuit board film is loaded, so that the film can be quickly replaced.

[0044] Example 2

[0045] See also Figure 7 and Figure 10 This embodiment further explains Example 1. The marking mechanism 8 includes a rotating shaft 33 rotatably mounted on the inner wall of the fixed ring 12 through a mounting seat, and the outer surface of the rotating shaft 33 and the output end of the motor 4 are driven by a second rotating wheel and a transmission belt 28 is installed. The outer surfaces of the suspension rod 15 and the rotating shaft 33 are both sleeved with a synchronous wheel 13. The synchronous wheel 13 is fixedly connected to the rotating shaft 33 and is rotatably connected to the suspension rod 15. The outer sides of several synchronous wheels 13 are driven by a synchronous belt 14. The outer surface of the synchronous belt 14 is fixedly mounted with several equidistantly distributed marking hemispheres 29. An observation component 9 is installed between the exposure machine housing 1 and the synchronous belt 14. The marking hemisphere 29 should have a color mark or a symbol mark so that the user can observe it.

[0046] See also Figure 8 In the figure, the observation component 9 includes a fixed frame 30 fixedly embedded in the front end of the exposure machine housing 1. A slot is opened inside the fixed frame 30, and the rear end of the slot is aligned with the synchronous belt 14. A transparent plate 31 is fixedly installed at the front end of the fixed frame 30, and a brightening light group 32 is provided on the inner wall of the slot. The transparent plate 31 is made of transparent acrylic material. Compared with glass, transparent acrylic material has stronger toughness, is not easy to break, and is cheap.

[0047] In this embodiment, during the half-turn rotation of the output end of the motor 4, the synchronous belt 14 can be driven to deflect by the cooperation of the second transmission belt 28 and the synchronous wheel 13. After the movement is completed, the user can observe the identification hemispheres 29 on the surface of the synchronous belt 14 through the notch and the transparent plate 31. Based on the information provided by the different identification hemispheres 29, the user can understand the PCB circuit board film of the exposed part of the film 18 at this time.

[0048] Example 3

[0049] See also Figure 3 and Figure 10 This embodiment further illustrates that the distance between two adjacent marking hemispheres 29 is equal to half the circumference of the synchronous wheel 13 for other embodiments.

[0050] In this embodiment, it is ensured that after the synchronous wheel 13 rotates half a circle following the motor 4, its marking hemisphere 29 can accurately move to the rear end of the slot for easy observation.

[0051] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0052] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A packaging substrate exposure device, comprising an exposure machine housing (1) and a control panel (2) installed at the front end of the exposure machine housing (1), wherein a conveyor line (3) is installed through the interior of the exposure machine housing (1), characterized in that: A motor (4) is fixedly mounted on the top of the interior of the exposure machine housing (1), and a UV lampshade (5) is fixedly mounted on the output shaft of the motor (4) via a mounting plate; A switching mechanism (6) capable of quickly switching the film required for exposure is installed at the bottom of the ultraviolet lamp cover (5); an identification mechanism (8) for observing the switching state of the switching mechanism (6), wherein the identification mechanism (8) is installed between the exposure machine housing (1) and the switching mechanism (6); The switching mechanism (6) includes a storage cover (11) symmetrically installed inside the exposure machine housing (1), and a central shaft (19) is rotatably installed inside the two storage covers (11), an exposure film (18) is movably embedded between the two storage covers (11), and both ends of the exposure film (18) are fixedly wound on the outer surface of the central shaft (19), and the winding directions of the two ends of the exposure film (18) are opposite, a frame (16) is fixedly installed on the top of the two storage covers (11), and the frame (16) is fixedly connected to the ultraviolet lamp cover (5), a guide frame (17) is fixedly installed between the two storage covers (11), and the exposure film (18) is slidably engaged with the guide frame (17), and a transmission component (7) is installed between the central shaft (19) and the exposure machine housing (1); The transmission assembly (7) includes a fixed ring (12) fixedly mounted inside the exposure machine housing (1) through a plurality of suspension rods (15), and a plurality of rotating columns (21) distributed in a circular array are fixedly mounted on the lower end of the fixed ring (12), a twisted arc bar sphere (20) is fixedly mounted on one end of the central axis (19), and a twisted arc bar sphere (23) is mounted on the end of the storage cover (11) away from the twisted arc bar sphere (20), the twisted arc bar sphere (23) and the twisted arc bar sphere (20) are symmetrically distributed, and both are movably engaged with the rotating column (21), and a reversing assembly (10) is mounted between the twisted arc bar sphere (23) and the central axis (19).

2. The packaging substrate exposure device according to claim 1, wherein: The reversing assembly (10) includes a limiting shell (22) fixedly mounted on one end of the storage housing (11) away from the twisted arc sphere (20), and a rotating shaft (25) is rotatably mounted inside the limiting shell (22), a transmission belt (27) is installed between the rotating shaft (25) and the central shaft (19) via a rotating wheel, a connecting shaft (24) is fixedly mounted on one end of the twisted arc sphere (23) close to the storage housing (11), and the connecting shaft (24) is rotatably embedded in the interior of the limiting shell (22), and gears (26) are fixedly mounted on the outer surfaces of the connecting shaft (24) and the rotating shaft (25), and the two gears (26) are movably engaged.

3. The packaging substrate exposure device according to claim 2, wherein: The marking mechanism (8) includes a rotating shaft (33) rotatably mounted on the inner wall of the fixed ring (12) through a mounting seat, and the rotating shaft (33) and the outer surface of the output end of the motor (4) are installed with a transmission belt (28) through a second rotating wheel, the outer surfaces of the suspension rod (15) and the rotating shaft (33) are both sleeved with a synchronous wheel (13), the synchronous wheel (13) is fixedly connected to the rotating shaft (33) and is rotatably connected to the suspension rod (15), the outer sides of several synchronous wheels (13) are installed with a synchronous belt (14), the outer surface of the synchronous belt (14) is fixedly installed with several marking hemispheres (29) distributed at equal intervals, and an observation component (9) is installed between the exposure machine housing (1) and the synchronous belt (14).

4. The packaging substrate exposure device according to claim 3, wherein: The observation assembly (9) includes a fixed frame (30) fixedly embedded in the front end of the exposure machine housing (1), a notch is provided inside the fixed frame (30), and the rear end of the notch is aligned with the synchronous belt (14), a transparent plate (31) is fixedly installed at the front end of the fixed frame (30), and a brightening light group (32) is provided on the inner wall of the notch, and the transparent plate (31) is made of transparent acrylic material.

5. The packaging substrate exposure device according to claim 1, wherein: The exposure film (18) is formed by splicing together a plurality of PCB circuit films.

6. The packaging substrate exposure device according to claim 4, wherein: The distance between two adjacent marking hemispheres (29) is equal to half the circumference of the synchronous wheel (13).

7. A packaging substrate exposure method, according to the packaging substrate exposure device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Film switching stage. Before exposing other batches of circuit boards, the control panel (2) controls the motor (4) to drive the UV lamp cover (5) and the frame (16) to rotate half a circle. Under the action of the transmission component (7) and the reversing component (10), the exposure film (18) is moved under the action of the two central shafts (19). Since the exposure film (18) is composed of multiple PCB circuit films, each time the exposure film (18) moves, one PCB circuit board film can be replaced. S2: linkage stage, each time the motor (4) drives the UV lamp cover (5) to rotate half a circle, the second transmission belt (28) can drive the shaft (33) to rotate, so that the synchronous belt (14) can be transmitted for a certain distance. At this time, the state of the exposed film (18) can be observed through the marking hemisphere (29) on the surface of the synchronous belt (14); S3: Observation stage, the user can observe the marking hemisphere (29) on the surface of the synchronous belt (14) through the transparent plate (31), wherein the brightening light group (32) can increase the brightness inside the fixed frame (30) to facilitate the user's observation.

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