Demolding device and demolding method for optical fiber transmission module

Abstract

A demolding device comprises a bottom plate, a lower pressing plate, a sleeve arranged in the bottom plate and the lower pressing plate, a spring arranged outside the sleeve and supported between the bottom plate and the lower pressing plate, a through hole is arranged in the middle of the lower pressing plate, and a supporting column is formed on the bottom plate and protrudes upward through the through hole. The application also comprises a demolding method of an optical fiber transmission module.

Description

Technical Field

[0001] This application relates to the field of optical transmission, and more particularly to a demolding device and a demolding method for an optical fiber transmission module. Background Technology

[0002] Currently, some small mobile terminals are equipped with a proximity sensor to automatically turn off the screen when portable products like mobile phones are placed in a pocket to prevent accidental touches; or to automatically turn off the screen and enter a certain state when a tablet is closed with a protective case. This sensor, such as the proximity sensing optical transceiver system disclosed in Chinese Patent Application No. 202110585787.2, specifically involves a light emitting unit emitting light below the screen of an electronic device. After the light passes through the screen and is reflected by the approaching object, it is received by a light receiving unit to determine the distance to the approaching object, thereby notifying the central processing unit to take appropriate action. However, the light transmission of this system requires a relatively large area of ​​light-transmitting hole at the corresponding position on the screen, which may produce large bright spots and cause visual defects on the screen. Using a dedicated light transmission medium could eliminate the need for a light emitting unit to directly receive reflected natural light, or the transmission medium could significantly reduce the area requirement for the screen's viewing point. The optical fiber needs to be fixed inside the module. The optical fiber is extremely thin, with an outer diameter of 0.55 mm and an inner diameter of 0.57 mm for fixing the optical fiber. The optical fiber needs to be fixed inside the fixing hole with glue, and it is necessary to ensure that the optical fiber and the fixing hole maintain good coaxiality. Summary of the Invention

[0003] Therefore, it is necessary to provide a demolding device that allows light to escape from the cover plate without damage, and a demolding method for fiber optic transmission modules.

[0004] To solve the above-mentioned technical problems, a demolding device is provided, including a base plate, a lower pressure plate, a sleeve sleeved inside the base plate and the lower pressure plate, and a spring sleeved outside the sleeve and supported between the base plate and the lower pressure plate. The lower pressure plate has a through hole in the middle, and the base plate protrudes upward to form a support column passing through the through hole.

[0005] Preferably, the demolding device is used to remove the optical fiber transmission module from a cover plate. The optical fiber transmission module includes a fixing frame with fixing holes and an optical fiber pre-fixed in the fixing holes with adhesive. The cover plate includes an exposed hole formed through it, an optical fiber limiting part protruding from the inner wall of the exposed hole towards the exposed hole, and a pair of positioning holes formed through both longitudinal sides of the optical fiber limiting part. The positioning hole includes a positioning hole section and a gradient hole section formed above the positioning hole section. The head of the optical fiber is accommodated in the positioning hole section.

[0006] Preferably, the cover plate and the optical fiber transmission module thereon are placed upside down on the lower pressure plate, and the support column passes through the through hole and is supported on the fixing frame, with the support position located at the periphery of the optical fiber.

[0007] Preferably, pressing down on the cover plate causes it to move downwards evenly, keeping the bracket supported on the support column stationary, and causing the head of the optical fiber to detach from the positioning hole section without scraping against the inner wall of the positioning hole section.

[0008] Preferably, the lower pressure plate has a pair of raised strips protruding upwards on both sides of the through hole, the cover plate is fixed on the raised strips, and the support column protrudes upwards above the raised strips.

[0009] Preferably, the lower pressure plate and the base plate are further provided with bolt holes, the sleeve is fitted into the bolt holes, and the two ends of the spring are supported on the surface of the base plate and the lower surface of the lower pressure plate.

[0010] Preferably, the fixing hole includes a main hole section, an open section above the main hole section, and a limiting section below the main hole section. The inner diameter of the main hole section is smaller than the inner diameter of the open section, the inner diameter of the limiting section is smaller than the inner diameter of the main hole section, the outer diameter of the optical fiber is not greater than the inner diameter of the main hole section but is greater than the inner diameter of the limiting section, and the inner diameter of the positioning hole section of the cover plate is smaller than the inner diameter of the main hole section.

[0011] Preferably, the head of the optical fiber is confined within the positioning hole section to maintain the coaxiality of the optical fiber and the fixing hole.

[0012] To address the aforementioned technical problems, this application also provides a method for demolding an optical fiber transmission module, including the aforementioned demolding device, comprising the following steps:

[0013] S301. Provide the demolding device;

[0014] S302. The cover plate and the optical fiber on it are placed upside down above the through hole of the lower pressure plate of the dispensing device; the support column is supported upward on the lower surface of the fixing frame through the through hole;

[0015] S303. Press the cover plate downwards to disengage the head of the optical fiber from the positioning hole section of the cover plate and detach the optical fiber transmission module from the cover plate.

[0016] Preferably, the fixing hole includes a main hole section, an open section above the main hole section, and a limiting section below the main hole section. The inner diameter of the main hole section is smaller than the inner diameter of the open section, the inner diameter of the limiting section is smaller than the inner diameter of the main hole section, the outer diameter of the optical fiber is not greater than the inner diameter of the main hole section but is greater than the inner diameter of the limiting section, and the inner diameter of the positioning hole section of the cover plate is smaller than the inner diameter of the main hole section.

[0017] The demolding device and demolding method of this application cause the cover plate to move downward evenly, so that the positioning hole section of the cover plate can detach the optical fiber without scratching, thus avoiding damage to the optical fiber. Attached Figure Description

[0018] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application.

[0019] Example 1

[0020] Figure 1 This is a perspective view of the fiber optic transmission module assembly in Example 1;

[0021] Figure 2 This is a perspective view of the fiber optic transmission module from another angle in Embodiment 1;

[0022] Figure 3 This is a cross-sectional view of the mounting frame for the fiber optic transmission module in Embodiment 1;

[0023] Figure 4 This is a three-dimensional view of the optical fiber in Example 1;

[0024] Figure 5 For along Figure 1 The cross-sectional view shown by the dashed line AA;

[0025] Example 2

[0026] Figure 6 This is a perspective view of the dispensing device in Example 2;

[0027] Figure 7 This is an exploded perspective view of the dispensing device in Example 2;

[0028] Figure 8 This is an exploded perspective view of the dispensing device in Example 2 from another angle;

[0029] Figure 9 for Figure 8 A magnified view of a portion of the dashed circle shown;

[0030] Figure 10 for Figure 6 A magnified view of a portion of the dashed circle shown;

[0031] Figure 11 for Figure 6 The cross-sectional view shown by the dashed line BB;

[0032] Figure 12 for Figure 11 A magnified view of a portion of the dashed circle shown;

[0033] Example 3

[0034] Figure 13 This is a perspective view of the demolding device in Example 3;

[0035] Figure 14 For along Figure 13 The cross-sectional view shown by the dashed CC line;

[0036] Figure 15 This is an exploded perspective view of the demolding device in Example 3.

[0037] Explanation of reference numerals in the attached figures

[0038] Fiber optic cable - 10; Light guide - 11; Outer cladding - 12; Coating - 13; Mounting bracket - 20; Lens hole - 21; Conductive sheet - 22; Fixing hole - 23; Main hole section - 231; Opening section - 232; Limiting section - 233; Limiting step - 234; Lower opening - 235; Adhesive - 24; Spacer - 25; Positioning part - 26; Dispensing device - 30; Base - 31; Base plate - 311; Column - 312; Limiting protrusion - 313; Bolt holes - 314, 323, 333, 412, 422; Middle plate - 32; Receiving groove - 321; Perforation - 322 ; Cover plate - 33; Cover plate body - 331; Longitudinal through groove - 332; Recess - 334; Exposed hole - 335; Fiber optic limiting part - 336; Protrusion - 3361; Lower suspension part - 3362; Partition groove - 3363; Positioning hole - 3364; Opening - 3365; Gradient hole section - 3366; Positioning hole section - 3367; Fixing bracket positioning part - 337, 338; Demolding device - 40; Base plate - 41; Base plate body - 411; Support column - 413; Support block - 414; Lower pressure plate - 42; Lower pressure plate body - 421; Protrusion - 423; Through hole - 424. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings.

[0040] This application is based on Figure 6 The X direction is the horizontal direction, the Y direction is the vertical direction, and the Z direction is the perpendicular direction. This application relates to a product structure of an optical fiber transmission module, a dispensing device for dispensing and fixing optical fibers to a mounting bracket 20, and a demolding device for removing the optical fiber transmission module from the cover plate 33 of the dispensing device.

[0041] Example 1

[0042] Please see Figures 1 to 5 As shown, the optical fiber transmission module of Embodiment 1 includes a mounting frame 20 and an optical fiber 10 fixed in the mounting frame 20 by adhesive.

[0043] The optical fiber 10 includes a light guide 11 and an outer cladding 12 surrounding the light guide 11. The light guide 11 serves as the light transmission medium, and the outer cladding 12, which surrounds the light guide 11, does not guide light. The outer diameter of the optical fiber 10 is 0.55 mm, and both ends of the optical fiber 10 are polished, resulting in good light guiding performance.

[0044] The mounting bracket 20 includes a through lens aperture 20, a conductive sheet 22 formed within the lens aperture 21 of the mounting bracket 20, a pair of mounting holes 23 through the mounting bracket 20, and a positioning portion 26 formed at one end of the mounting bracket 20. The positioning portion 26 is a hole structure formed on the mounting bracket 20.

[0045] Key references Figure 3 As shown, the fixing hole 23 includes a main hole section 231, an open section 232 located above the main hole section 231, and a limiting section 233 located below the main hole section 231. The inner diameter of the main hole section 231 is smaller than the inner diameter of the open section 232, and the inner diameter of the limiting section 233 is smaller than the inner diameter of the main hole section 231. The fixing holes 23 are arranged side by side as a pair, with the open section 232 facing upward in a trumpet shape and serving as a draft opening. A limiting step 234 is formed at the junction of the limiting section 233 and the main hole section 231, and a lower opening 235 is formed at the bottom of the limiting section 233, the inner diameter of which is larger than the inner diameter of the limiting section 233.

[0046] The inner diameter of the main hole section 231 is 0.60 mm. The optical fiber 10 is inserted into the main hole section 231 from above the open section 232. The outer cladding 12 at the lower end of the optical fiber 10 is at least partially confined on the limiting step 234 and will not fall from below the limiting section 233.

[0047] When the optical fiber 10 enters the fixing hole 23, there is a 0.025mm gap between the outer diameter of the optical fiber 10 and the inner diameter of the main hole section 231. Therefore, if the optical fiber 10 is tilted, the maximum possible 0.05mm gap between the optical fiber 10 and the fixing hole 23 may occur. According to customer quality requirements, the 0.03mm gap between the optical fiber 10 and the fixing hole 23 must not exceed this limit.

[0048] To improve the coaxiality of the optical fiber 10 and the fixing hole 23, before applying adhesive to fix the optical fiber 10, a coating 13 is formed by spraying adhesive or adding a PVD layer on the outer layer of the optical fiber 10. The thickness of the coating 13 is between 0.01-0.02 mm. This increases the outer diameter of the optical fiber 10 by 0.02-0.04 mm, reaching 0.57-0.59 mm. At this point, in the free state, the gap between the optical fiber 10 and the main hole section 231 is between 0.01-0.03 mm, meeting the customer's predetermined quality requirements.

[0049] After the optical fiber 10 is inserted into the fixing hole 23, the dispensing device injects glue around the opening section 232, so that the glue is contained outside the opening section 232 and the optical fiber 10 is fixed in the fixing hole 23.

[0050] The manufacturing method of the optical fiber transmission module in this application includes the following steps:

[0051] S101. Provide a pre-molded mounting bracket 20;

[0052] The fixing frame 20 formed in this step includes a pair of fixing holes 23. Each fixing hole 23 includes a main hole section 231, an open section 232 located above the main hole section 231, and a limiting section 233 located below the main hole section 231. The inner diameter of the main hole section 231 is smaller than the inner diameter of the open section 232, and the inner diameter of the limiting section 233 is smaller than the inner diameter of the main hole section 231. A limiting step 234 is formed above the junction of the limiting section 233 and the main hole section 231.

[0053] S102. Provide an optical fiber 10 and add a coating 13 to the outside of the optical fiber 10;

[0054] The outer diameter of the optical fiber 10 is 0.55 mm. After the coating 13 is added, the outer diameter is greater than 0.57 mm and less than 0.59 mm. The inner diameter of the main aperture section 231 is 0.60 mm. The optical fiber 10 includes a light guide 11 and an outer cladding layer 12 wrapped around the light guide 11. The coating is wrapped around the outer surface of the outer cladding layer 12.

[0055] S103. Insert the optical fiber 10 into the fixing hole 23 from the open section 232, with the bottom periphery of the optical fiber 10 limited on the limiting step 234.

[0056] The outer cladding 12 of the optical fiber 10 is positioned on the limiting step 234. The upper end of the optical fiber 10 protrudes above the open section 232.

[0057] S104. Apply adhesive along the outer periphery of the optical fiber 10 in the open section 232 to fix the optical fiber 10 into the fixing hole 23 of the fixing frame 20.

[0058] The fiber optic transmission device and its manufacturing method described in this application increase the outer diameter of the fiber optic cable 10 by providing a coating 13 around the outer periphery of the fiber optic cable 10, thereby reducing the maximum gap between the fiber optic cable 10 and the fixing hole 23 to within 0.03 mm. This improves the coaxiality between the fiber optic cable 10 and the fixing hole 23.

[0059] Example 2

[0060] Please see Figures 6 to 11 The attached figure shows the dispensing device 30 of this embodiment. The dispensing device 30 of this embodiment includes a base 31, a middle plate 32 mounted on the base 31, and a cover plate 33 disposed above the middle plate 32.

[0061] The base 31 includes a base plate 311, a column 312 protruding upward from the middle of the base plate 311, and a pair of limiting protrusions 313 protruding upward from the column 312. The base plate 311 also has a bolt hole 314. The limiting protrusions 313 are circular cylinders, and their outer diameter is not greater than the inner diameter of the limiting section 233 of the fixing hole 23. The limiting protrusions 313 extend upward into the limiting section 233 and support the light beam 10 within the fixing hole 23.

[0062] The middle plate 32 is recessed downward to form a receiving groove 321 for accommodating part of the fixing frame 20, and a through hole 322 is formed vertically through the receiving groove 321. After the fixing frame 20 is fixed in the receiving groove 321 of the middle plate 32, part of the fixing frame 20 is located in the through hole 322 and exposed downward.

[0063] The cover plate 33 includes a cover plate body 331, a longitudinal through groove 332 formed on the surface of the cover plate body 331 along the longitudinal direction, a recessed portion 334 formed by continuing to recess downward from one side of the longitudinal through groove 332, an exposure hole 335 formed through the cover plate body 331, and an optical fiber limiting portion 336 formed on the inner wall of the exposure hole 335 near the longitudinal through groove 332.

[0064] The exposure hole 335 is formed by cutting away the middle portion between the cover plate body 331 and the recessed portion 334. The fiber optic limiting portion 336 is formed on the inner wall surface of the exposure hole 335 near the longitudinal through groove 332, and the top surface of the fiber optic limiting portion 336 is flush with the top surface of the longitudinal through groove 332, while the bottom of the fiber optic limiting portion 336 protrudes downward from the lower surface of the cover plate body 331. Fixing bracket positioning members 337 and 338 extend downward from the lower surface of the longitudinal through groove 332 and the inner wall surface of the exposure hole 335 away from the fiber optic limiting portion 336, forming a fixing bracket positioning member 337. The fixing bracket positioning member 337 is inserted into the lens hole 21 of the fixing bracket 20 for positioning, and the fixing bracket positioning member 338 positions the positioning portion 26 of the fixing bracket 20. The two fixing bracket positioning members 337 and 338 achieve precise positioning of the fixing bracket 20.

[0065] The fiber optic limiting part 336 includes a protrusion 3361 protruding from the inner wall of the exposure hole 335, a lower hanging part 3362 protruding downward from the bottom of the protrusion 3361 onto the lower surface of the cover plate body 331, and a pair of positioning holes 3364 formed by penetrating the protrusion 3361 on both sides in the lateral direction.

[0066] The lower suspension portion 3362 has a partition groove 3363 between a pair of positioning holes 3364. The partition groove 3363 is used to receive the spacer 25 between a pair of fixing holes 23 of the fixing bracket 20. The longitudinal outer sides of the pair of positioning holes 3364 are both open structures, forming an open opening 3365. The open opening 3365 exposes the upper part of the optical fiber 10 within the exposure hole 335. The arc length of the open opening 3365 is no greater than one-third of the arc length of the positioning hole 3364. The positioning hole 3364 includes a gradient hole section 3366 at the upper end and a positioning hole section 3367 below the gradient hole section 3366. The inner diameter of the gradient hole section 3366 gradually decreases from top to bottom, and the positioning hole section 3367 smoothly transitions to the lower end of the gradient hole section 3366. The single-sided gap between the positioning hole section 3367 and the optical fiber 10 is no greater than 0.015 mm. That is, the inner diameter of the positioning hole section 3367 is between 0.55-0.58mm.

[0067] The middle plate 32 and the cover plate 33 are also provided with a number of bolt holes 323, 333 at the positions corresponding to the bolt holes 314 of the base 31. The base 31, the middle plate 32 and the cover plate 33 are fixed together by bolt strips passing through the bolt holes 314.

[0068] In this embodiment, when the optical fiber 10 is fixed to the fixing hole 23 of the fixing frame 20 by applying adhesive, it is not necessary to spray adhesive on the outer surface of the optical fiber 10 to increase the thickness as in Embodiment 1.

[0069] The manufacturing method of the optical fiber transmission module in this embodiment includes the following steps:

[0070] S201. Assemble the middle plate 32 onto the base 31, and insert the fixing bracket 20 into the receiving groove of the middle plate 32;

[0071] The structure of the base 31 and the middle plate 32 mentioned in this step has been described previously and will not be repeated here. The upright post 312 and the limiting protrusion 313 of the base 31 extend into the through hole 322. The limiting protrusion 313 enters the limiting section 233 of the fixing hole 23 of the fixing frame 20 and is flush with the limiting step 234.

[0072] S202, Place the cover plate 33 on the middle plate 32 and fix the fixing bracket 20 below;

[0073] In this step, the lower end of the positioning hole 3364 of the cover plate 33, the lower overhang 3362, is located inside or above the open section 232 of the fixing hole 23, and the outer diameter of the positioning hole 3364 is smaller than the inner diameter of the upper part of the open section 232. At this time, the partition 25 enters the groove 3363 in the middle of the lower overhang 3362.

[0074] S203. Insert the two optical fibers 10 into the gradient hole section 3366 at the top of the positioning hole 3364 until they enter the limiting step 234 of the fixing frame 20 at the bottom.

[0075] In this step, the limiting protrusion 313 supports upward to keep the optical fiber 10 balanced, so as to maintain good coaxiality between the optical fiber 10 and the fixing hole 23. At this time, the top of the optical fiber 10 is located within the positioning hole segment 3367 of the positioning hole 3364, which keeps the optical fiber 10 balanced and maintains better coaxiality with the fixing hole 23, thus compensating for the problem that the large inner diameter of the fixing hole 23 may cause low coaxiality.

[0076] S204. Apply adhesive to the open section 232 through the exposed hole 335 at the opening 3365 on the longitudinal outer side of the positioning hole 3364 and cure the adhesive.

[0077] The base 31, middle plate 32 and cover plate 33 of the dispensing device are all made of transparent material. After dispensing, the dispensing device is irradiated with a UV light source to cure the adhesive.

[0078] S205. Remove the fixing bracket 20 from the dispensing device;

[0079] In this step, the cover plate 33 and the fixing bracket 20 are removed together from the middle plate 32, and then the fixing bracket 20 is removed from the cover plate 33.

[0080] S206. After applying adhesive around the open section 232 of the fixing frame 20, the adhesive is cured.

[0081] The manufacturing method of the dispensing device and optical fiber transmission module of this application involves providing a pair of positioning holes 336 with open openings 3365 on the cover plate 33. When dispensing adhesive, the upper end of the optical fiber 10 is confined within the positioning holes 336 so that the optical fiber 10 and the fixing hole 23 of the fixing frame 20 maintain good coaxiality.

[0082] Example 3

[0083] Please see Figures 13 to 15 The attached figure shows the demolding device 40 of Embodiment 3. In step S205 of Embodiment 2, it is necessary to remove the fixing frame 20 and the pre-fixed optical fiber 10 from the dispensing device. During the removal process, because the inner diameter of the positioning hole segment 3367 of the positioning hole 3364 of the cover plate 33 is very close to the outer diameter of the optical fiber 10 that is accommodated in the positioning hole segment 3367, the gap between the top of the optical fiber 10 and the inner wall surface of the positioning hole segment 3367 is very small. If the fixing frame 20 is pulled down manually, and the downward force is slightly off-center, the optical fiber 10 will scratch the positioning hole segment 3367 and be damaged.

[0084] Therefore, a dedicated demolding device is needed to solve the above-mentioned technical problems.

[0085] The demolding device of this embodiment includes a base plate 41, a lower pressure plate 42, a sleeve 43 supporting the base plate 41 and the lower pressure plate 42, and a spring (not shown) sleeved on the sleeve 43 and supported between the base plate 41 and the lower pressure plate 42.

[0086] The base plate 41 includes a base plate body 411, a support column 413 protruding upward from the middle of the base plate body 411, and a support block 414 protruding upward from the top of the support column 413. The lower pressure plate 42 includes a lower pressure plate body 421, a pair of protruding strips 423 protruding upward from the lower pressure plate body 421 in a transverse or longitudinal direction, and a through hole 424 penetrating the lower pressure plate body 421 and located between the pair of protruding strips 423. The base plate 41 and the lower pressure plate 42 are also provided with bolt holes 412 and 422 for installing the sleeve 43. The support column 413 passes through the through hole 424 of the lower pressure plate 42 and causes the top of the support block 414 to extend upward beyond the upper surface of the protruding strips 423.

[0087] The cover plate 33 is inverted on the protrusion 423 and positioned relative to each other by some positioning structures. At this time, the portion of the fixing frame 20 near the optical fiber 10 is supported on the support block 414. Pressing the cover plate 33 downwards causes the fixing frame 20, along with the optical fiber 10, to be supported on the support block 414, while the cover plate 33 moves downwards, causing the head of the optical fiber 10 to detach from the positioning hole segment 3367. This allows the optical fiber 10 of the optical fiber transmission device of this application to detach from the positioning hole segment 3367 of the cover plate 33 without damage.

[0088] The demolding method for the optical fiber transmission module in this application includes the following steps:

[0089] S301, Provide a demolding device 40;

[0090] The specific structure of the demolding device 40 has been described in detail above and will not be repeated here.

[0091] S302, The cover plate 33 and the optical fiber 10 thereon are placed upside down on the protrusion 423 of the lower pressure plate 42 of the dispensing device 40;

[0092] In this step, the support block 414 of the support column 413 supports the fixing frame 20 upward, and the support position is based on keeping the fixing frame 20 stable and balanced, especially the fixing frame 20 around the optical fiber 10 is supported.

[0093] S303. Press down on the cover plate 33 to disengage the optical fiber 10 from the positioning hole section 3367 and disengage the optical fiber transmission module 20 from the cover plate 33.

[0094] In this step, the cover plate 33 needs to be pressed downwards in a balanced manner to make each position move downwards synchronously, while compressing the spring. Meanwhile, the support block 414 of the support column 413 pushes upwards against the fixing frame 20, and the cover plate 33 moves downwards to disengage the positioning hole section 3367 from the optical fiber 10.

[0095] In this embodiment, the demolding device 40 moves the cover plate 33 downwards evenly, allowing the optical fiber 10 to detach from the positioning hole segment 3367 of the cover plate 33 without scratching.

[0096] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A demolding device, characterized in that, The device includes a base plate, a lower pressure plate, a sleeve fitted inside the base plate and the lower pressure plate, and a spring fitted outside the sleeve and supported between the base plate and the lower pressure plate. The lower pressure plate has a through hole in the middle, and the base plate protrudes upward to form a support column passing through the through hole. The demolding device is used to remove the optical fiber transmission module from a cover plate. The optical fiber transmission module includes a fixing frame with fixing holes and an optical fiber pre-fixed in the fixing holes with adhesive. The cover plate includes an exposed hole formed through it, an optical fiber limiting part protruding from the inner wall of the exposed hole towards the exposed hole, and a pair of positioning holes formed through both longitudinal sides of the optical fiber limiting part. The positioning hole includes a positioning hole section and a gradient hole section formed above the positioning hole section. The head of the optical fiber is accommodated in the positioning hole section.

2. The demolding device as described in claim 1, characterized in that, The cover plate and the optical fiber transmission module on it are placed upside down on the lower pressure plate, and the support column passes through the through hole and is supported on the fixing frame, with the support position located at the periphery of the optical fiber.

3. The demolding device as described in claim 2, characterized in that, Press down on the cover plate to move it downwards evenly, keeping the bracket supported on the support column stationary, so that the head of the optical fiber detaches from the positioning hole section without scraping against the inner wall of the positioning hole section.

4. The demolding device as described in claim 3, characterized in that, The lower pressure plate has a pair of raised strips protruding upwards on both sides of the through hole. The cover plate is fixed on the raised strips, and the support column protrudes upwards above the raised strips.

5. The demolding device as described in claim 4, characterized in that, The lower pressure plate and the base plate are also provided with bolt holes, the sleeve is fitted into the bolt holes, and the two ends of the spring are supported on the surface of the base plate and the lower surface of the lower pressure plate.

6. The demolding device as described in claim 5, characterized in that, The fixing hole includes a main hole section, an open section above the main hole section, and a limiting section below the main hole section. The inner diameter of the main hole section is smaller than the inner diameter of the open section, the inner diameter of the limiting section is smaller than the inner diameter of the main hole section, the outer diameter of the optical fiber is not greater than the inner diameter of the main hole section but is greater than the inner diameter of the limiting section, and the inner diameter of the positioning hole section of the cover plate is smaller than the inner diameter of the main hole section.

7. The demolding device as described in claim 6, characterized in that, The head of the optical fiber is confined within the positioning hole section to maintain the coaxiality of the optical fiber and the fixing hole.

8. A method for demolding an optical fiber transmission module, comprising the demolding device as described in claim 1, characterized in that, Includes the following steps S301. Provide the demolding device; S302. The cover plate and the optical fiber on it are placed upside down above the through hole of the lower pressure plate of the demolding device; the support column is supported upward on the lower surface of the fixing frame through the through hole; S303. Press the cover plate downwards to disengage the head of the optical fiber from the positioning hole section of the cover plate and detach the optical fiber transmission module from the cover plate.

9. The demolding method for an optical fiber transmission module as described in claim 8, characterized in that, The fixing hole includes a main hole section, an open section above the main hole section, and a limiting section below the main hole section. The inner diameter of the main hole section is smaller than the inner diameter of the open section, the inner diameter of the limiting section is smaller than the inner diameter of the main hole section, the outer diameter of the optical fiber is not greater than the inner diameter of the main hole section but is greater than the inner diameter of the limiting section, and the inner diameter of the positioning hole section of the cover plate is smaller than the inner diameter of the main hole section.

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