Camera module final inspection method

Abstract

The application discloses a kind of camera module finished product final inspection method, comprising the following steps: S1, camera module finished product is placed on loading fixture;S2, by loading fixture to camera module finished product is fixed and energized;S3, loading fixture movement, camera module finished product moves with loading fixture, until the lens of camera module finished product is directly opposite white field test equipment;S4, white field test equipment provides enough to cover the light of the lens of camera module finished product;S5, camera module finished product takes photograph, if there is black dot or black block on the photograph, then there is dirt in the inside of camera module finished product, if there is no black dot or black block on the photograph, then camera module finished product is qualified product.The application can be fixed and energized to camera module finished product, can also provide white field environment to facilitate white field test, improve the degree of automation of detecting camera module finished product.

Description

Technical Field

[0001] This invention relates to the inspection of camera module finished products, and more specifically to a final inspection method for camera module finished products. Background Technology

[0002] Currently, the industry standard for detecting internal contamination in camera module components is found during downstream process inspection. If contamination is detected after the initial inspection, the camera is typically reworked and manually disassembled in the upstream process. However, manual disassembly can lead to damage due to inconsistent techniques and pressure, resulting in wasted resources. Therefore, retesting is performed during upstream rework. Since both the initial and retesting are done manually, requiring a large workforce, labor costs increase. Therefore, there is a need to improve the automation level of camera module component inspection.

[0003] CN213041476U discloses an integrated device for focusing and dispensing of camera module finished products, including a turntable and a testing mechanism. The turntable is rotatable relative to the testing mechanism. The testing mechanism includes a black level testing component, a ranging component, a focusing component, a white level testing component, a dispensing component, and a curing component circumferentially arranged around the turntable. The turntable is equipped with eight fixtures for fixing the camera module finished products. The dispensing component includes a dispensing head for dispensing adhesive to the camera module finished products, a dispensing drive component for driving the dispensing head to move, and a cleaning component for cleaning residual adhesive on the dispensing head. This device includes a white level testing component, and the eight fixtures can sequentially pass through the black level testing component, ranging component, focusing component, white level testing component, dispensing component, and curing component during the turntable's rotation, achieving image quality testing and rapid focusing, thus improving work efficiency. However, this device performs testing before dispensing and curing, and cannot guarantee the quality of the final product. Undoubtedly, the technical solutions disclosed in the aforementioned patent documents represent a beneficial attempt in their respective technical fields, but there is still room for improvement. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a final inspection method for camera module products, which can fix and power on the camera module products, and also provide a white field environment to facilitate white field testing, thereby improving the automation level of camera module product inspection.

[0005] A final inspection method for a camera module assembly according to the present invention includes the following steps: S1. Place the camera module assembly on the loading fixture; S2. Secure the camera module assembly using the loading fixture and power it on; S3. The loading fixture moves, and the camera module moves with the loading fixture until the lens of the camera module is facing the white field test equipment. S4, the white field test equipment provides enough light to cover the lens of the camera module product; S5. Take a photo of the camera module. If there are black spots or black patches in the photo, the camera module is dirty inside. If there are no black spots or black patches in the photo, the camera module is a qualified product.

[0006] Furthermore, it also includes the following steps: S6. The loading fixture moves, and the camera module product moves with the loading fixture until the loading fixture and the camera module product return to the position in step S2. S7. Remove the camera module assembly.

[0007] Furthermore, the loading fixture includes a module positioning device, an electrical connection device, a fixture housing, and a module cavity component disposed on the fixture housing; The fixture housing has an internal cavity, and the module cavity is provided with a mounting groove for accommodating the camera module product. The mounting groove is provided with a clearance through hole to connect the cavity with the outside. The module positioning device includes a cavity pressing block disposed on the clamp housing and a first driving mechanism capable of moving the cavity pressing block. The cavity pressing block is provided with a module exposure groove. When the first driving mechanism moves the cavity pressing block above the mounting groove, a clamping space for fixing the camera module assembly is formed between the cavity pressing block and the module cavity component, and the module exposure groove exposes the lens of the camera module assembly. When the first driving mechanism moves the cavity pressing block away from the mounting groove, the camera module assembly can enter and exit the mounting groove. The electrical connection device is disposed in the cavity. The electrical connection device includes an RF pin connector and a second driving mechanism. The RF pin connector is located directly below the clearance via. The second driving mechanism can drive the RF pin connector to move in the vertical direction so that the RF pin connector moves closer to or further away from the clearance via.

[0008] Furthermore, the first driving mechanism includes a first cylinder, a first connecting block, and two pressure block connecting seats. The first cylinder is disposed on one side of the fixture housing. The first connecting block is connected to the output shaft of the first cylinder, and the axis of the output shaft of the first cylinder is along the left-right direction. The two pressure block connecting seats are respectively connected to the front and rear sides of the cavity pressure block, and the first connecting block is connected to one of the pressure block connecting seats.

[0009] Furthermore, a guide rail is provided on the front and rear sides of the clamp housing, and the length direction of the two guide rails is along the left and right direction. The two pressure block connecting seats are slidably connected to the two guide rails respectively.

[0010] Furthermore, the second drive mechanism includes a second cylinder, a flexible floating joint, and a connector mounting base arranged sequentially from bottom to top. The axis of the output shaft of the second cylinder is along the vertical direction, and the radio frequency pin connector is mounted on the connector mounting base.

[0011] Furthermore, the connector mounting base is provided with multiple guide rods, and the module cavity is provided with guide holes corresponding to the positions of the multiple guide rods, with the axes of the guide rods and guide holes both along the vertical direction.

[0012] Furthermore, the second drive mechanism also includes a support plate connected to the lower part of the second cylinder, and the support plate is connected to the clamp housing.

[0013] Furthermore, the fixture housing includes a housing base plate, a housing upper seat, and multiple housing side plates, which are connected sequentially around the periphery. The multiple housing side plates are all located between the housing base plate and the housing upper seat, and the housing upper seat is provided with a square hole for installing the module cavity component.

[0014] Furthermore, the white field testing equipment includes a white field light source, a light source mounting bracket, a third cylinder, and an equipment mounting bracket. The white field light source is connected to the light source mounting bracket, the third cylinder is connected to the equipment mounting bracket, the output shaft of the third cylinder is connected to the light source mounting bracket, and the axis of the output shaft of the third cylinder is along the left-right direction.

[0015] The beneficial effects of this invention are: 1. The present invention can ensure the accurate positioning of the camera module by fixing it with a loading fixture during white field testing. By powering on the camera module with the loading fixture, it can ensure that the camera module can take pictures during white field testing, ensuring that the white field test can be carried out normally and improving the automation of camera module testing. 2. The loading fixture of the present invention can move the cavity pressure block by the first drive to position the cavity pressure block above the camera module assembly, thereby restricting the movement of the camera module assembly; it can also move the cavity pressure block by the first drive to expose the mounting groove, allowing the camera module assembly to enter and exit the mounting groove; and it can move the RF pin connector closer to or further away from the clearance through hole by the second drive mechanism, thereby connecting or separating the RF pin connector from the module electrical connector of the camera module assembly, realizing the power supply or power disconnection of the camera module assembly. 3. The loading fixture of the present invention can ensure the accurate movement direction of the cavity pressing block and the connector mounting seat, and can also prevent damage to the pins when the RF pin connector is connected to the camera module finished product. 4. The output shaft of the third cylinder of the white field testing device of the present invention can drive the light source mounting bracket to move toward the camera module assembly. The light source mounting bracket drives the white field light source to move, thereby bringing the white field light source closer to the lens of the camera module assembly, thus ensuring that the light can cover the lens of the camera module assembly and ensuring the quality of the photos taken during the white field test. Attached Figure Description

[0016] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the workflow of the present invention; Figure 2 This is a diagram showing the positional relationship between the loading fixture and the white field testing equipment of the present invention. Figure 3 This is one of the structural schematic diagrams of the loading clamp of the present invention; Figure 4 This is a second schematic diagram of the loading clamp of the present invention; Figure 5 This is a schematic diagram of the structure of the loading fixture and the camera module of the present invention in conjunction. Figure 6 This is one of the structural schematic diagrams of the electrical connection device and the module cavity component of the present invention; Figure 7 This is a second schematic diagram of the structure of the electrical connection device and the module cavity component of the present invention. Figure 8 This is a schematic diagram of the module cavity component of the present invention; Figure 9 This is a schematic diagram of the structure of the housing upper seat of the present invention; Figure 10 This is a schematic diagram of the structure of the white field testing equipment of the present invention.

[0017] The following labels are used in the attached drawings: 1-Module positioning device, 11-Cavity pressing block, 111-Module exposed groove, 12-First drive mechanism, 121-First cylinder, 122-First connecting block, 123-Pressing block connecting seat, 124-Guide slide rail; 2-Electrical connection device, 21-RF pin connector, 22-Second drive mechanism, 221-Second cylinder, 222-Flexible floating joint, 223-Connector mounting base, 224-Guide rod, 225-Support plate, 226-Quick-change air tube connector; 3-Clamp housing, 31-Housing upper seat, 32-Housing side plate, 33-Housing bottom plate; 4-Module cavity component, 41-Mounting groove, 42-Leaving through hole, 43-Guide hole; 5-White field testing equipment, 51-White field light source, 52-Light source mounting bracket, 53-Third cylinder, 54-Equipment mounting bracket; 6-Camera module finished product, 61-Lens. Detailed Implementation

[0018] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, a final inspection method for a camera module in this embodiment includes the following steps: S1. Place the camera module assembly 6 onto the loading fixture; S2. The camera module assembly 6 is fixed and powered on using a loading clamp; in steps S1 and S2, the lens 61 of the camera module assembly 6 faces upwards, as shown below. Figure 2 As shown in the diagram on the right; S3. The loading fixture moves, and the camera module assembly 6 moves with the loading fixture until the lens 61 of the camera module assembly 6 is directly facing the white field testing equipment 5. During setup, the base plate 33 of the loading fixture is connected to the transport equipment. The transport equipment uses existing devices capable of moving the device fixture. The white field testing equipment 5 is fixed to the upper right of the loading fixture. The transport equipment can drive the transfer fixture and the camera module assembly 6 to rotate, causing the camera module assembly 6 to rotate from a position where the lens 61 faces upwards to a position where the lens 61 faces right, thus ensuring that the lens 61 of the camera module assembly 6 is directly facing the white field testing equipment 5. Figure 2 As shown in the middle section of the diagram; S4. The white field testing equipment 5 provides sufficient light to cover the lens 61 of the camera module assembly 6. After the lens 61 of the camera module assembly 6 is directly facing the white field testing equipment 5, the white field testing equipment 5 brings the white field light source 51 close to the lens 61 of the camera module assembly 6, thereby ensuring that the light can cover the lens 61 of the camera module assembly 6. Figure 2 As shown in the diagram on the right; S5. The camera module finished product 6 takes a photo. If there are black spots or black patches in the photo, then there is dirt inside the camera module finished product 6. If there are no black spots or black patches in the photo, then the camera module finished product 6 is a qualified product. S6. The loading fixture moves, and the camera module 6 moves with the loading fixture until the loading fixture and the camera module 6 return to the position in step S2. At this time, the lens 61 of the camera module 6 faces upward. S7. Remove the camera module assembly 6.

[0020] After the camera module assembly 6 is processed, this method is used for final inspection, which can detect whether there is dirt inside the camera module assembly 6. Fixing the camera module assembly 6 with the loading fixture can ensure that the camera module assembly 6 is accurately positioned during the white field test. Powering the camera module assembly 6 with the loading fixture can ensure that the camera module assembly 6 can take pictures during the white field test, ensuring that the white field test can be carried out normally and improving the automation level of the inspection of the camera module assembly 6.

[0021] like Figures 3-9 As shown, in this embodiment, the loading fixture includes a module positioning device 1, an electrical connection device 2, a fixture housing 3, and a module cavity component 4 disposed on the fixture housing 3; The fixture housing 3 has an internal cavity, and the module cavity 4 is provided with a mounting groove 41 for accommodating the camera module product 6. The mounting groove 41 is provided with a clearance through hole 42 to connect the cavity with the outside. The module positioning device 1 includes a cavity pressing block 11 disposed on the clamp housing 3 and a first driving mechanism 12 capable of moving the cavity pressing block 11. The cavity pressing block 11 is provided with a module exposure groove 111. When the first driving mechanism 12 moves the cavity pressing block 11 above the mounting groove 41, a clamping space for fixing the camera module assembly 6 is formed between the cavity pressing block 11 and the module cavity component 4, and the module exposure groove 111 exposes the lens 61 of the camera module assembly 6. When the first driving mechanism 12 moves the cavity pressing block 11 away from the mounting groove 41, the camera module assembly 6 can enter and exit the mounting groove 41. The electrical connection device 2 is disposed in the cavity. The electrical connection device 2 includes an RF pin connector 21 and a second drive mechanism 22. The RF pin connector 21 is located directly below the clearance through hole 42. The second drive mechanism 22 can drive the RF pin connector 21 to move in the up and down direction so that the RF pin connector 21 is closer to or further away from the clearance through hole 42.

[0022] Specifically, step S1, "placing the camera module assembly 6 on the loading fixture," includes: moving the cavity pressing block 11 via the first drive mechanism 12 to expose the mounting slot 41, and then placing the camera module assembly 6 into the mounting slot 41; step S2, "fixing the camera module assembly 6 and powering it on via the loading fixture," includes: moving the cavity pressing block 11 via the first drive mechanism to position the cavity pressing block 11 above the camera module assembly 6, thereby restricting the movement of the camera module assembly 6, and then moving the RF pin connector 21 closer to the clearance via the second drive mechanism 22. Hole 42, until the RF pin connector 21 is connected to the module electrical connector of the camera module assembly 6, so as to realize the power supply of the camera module assembly 6; Step S7 "removing the camera module assembly 6" specifically includes: moving the RF pin connector 21 away from the clearance hole 42 by the second drive mechanism 22 until the RF pin connector 21 is disconnected from the module electrical connector of the camera module assembly 6, so as to realize the power supply of the camera module assembly 6; moving the cavity pressure block 11 by the first drive mechanism 12 to expose the mounting groove 41, and removing the camera module assembly 6 after the test is completed from the mounting groove 41.

[0023] In this embodiment, the first driving mechanism 12 includes a first cylinder 121, a first connecting block 122, and two pressure block connecting seats 123. The first cylinder 121 is disposed on one side of the fixture housing 3, and the first connecting block 122 is connected to the output shaft of the first cylinder 121, the axis of which is along the left-right direction. The two pressure block connecting seats 123 are respectively connected to the front and rear sides of the cavity pressure block 11, and the first connecting block 122 is connected to one of the pressure block connecting seats 123. Preferably, in this embodiment, a guide rail 124 is respectively provided on the front and rear sides of the fixture housing 3, the length direction of both guide rails 124 is along the left-right direction, and the two pressure block connecting seats 123 are slidably connected to the two guide rails 124 respectively. The two pressure block connecting seats 123 and the cavity pressure block 11 are connected to form an inverted "U" shape. The output shaft of the first cylinder 121, the first connecting block 122, the pressure block connecting seats 123 and the cavity pressure block 11 are connected to ensure that the cavity pressure block 11 can move in the left and right direction when the output shaft of the first cylinder 121 extends or retracts, thereby enabling the cavity pressure block 11 to move closer to or further away from the top of the mounting groove 41. The two pressure block connecting seats 123 can ensure that the moving direction of the cavity pressure block 11 is accurate.

[0024] In this embodiment, a guide slide rail 124 is provided on the front and rear sides of the clamp housing 3, and the length direction of the two guide slide rails 124 is along the left and right direction. The two pressure block connecting seats 123 are slidably connected to the two guide slide rails 124 respectively.

[0025] In this embodiment, the second driving mechanism 22 includes a second cylinder 221, a flexible floating joint 222, and a connector mounting base 223 arranged sequentially from bottom to top. The axis of the output shaft of the second cylinder 221 is along the vertical direction, and the RF pin connector 21 is mounted on the connector mounting base 223. The extension and retraction of the output shaft of the second cylinder 221 can drive the flexible floating joint 222 and the connector mounting base 223 to move closer to or away from the clearance through hole 42, thereby enabling the connector mounting base 223 to drive the RF pin connector 21 to move closer to or away from the clearance through hole 42, thereby realizing the connection or separation of the RF pin connector 21 and the module electrical connector of the camera module assembly 6. The flexible floating joint 222 is made of an elastic material, such as rubber, which can prevent damage to the pins when the RF pin connector 21 is connected to the camera module assembly 6. The second drive mechanism 22 also includes a quick-connect air pipe 226. The quick-connect air pipe 226 has multiple air inlets and an air outlet connected to the second cylinder 221. The second cylinder 221 can be connected to the air supply equipment through the quick-connect air pipe 226 to realize the air intake and exhaust of the second cylinder 221. The quick-connect air pipe 226 has multiple air inlets to adapt to different types of air supply equipment.

[0026] In this embodiment, the connector mounting base 223 is provided with multiple guide rods 224, and the module cavity component 4 is provided with guide holes 43 corresponding to the positions of the multiple guide rods 224. The axes of the guide rods 224 and the guide holes 43 are both along the vertical direction. The module cavity component 4 is fixed on the fixture housing 3. By cooperating with the guide rods 224 on the connector mounting base 223 through the guide holes 43 on the module cavity component 4, the movement direction of the connector mounting base 223 can be ensured to be accurate, thereby preventing the position of the RF pin connector 21 from being misaligned and unable to connect with the camera module finished product 6.

[0027] In this embodiment, the second drive mechanism 22 further includes a support plate 225 connected to the lower part of the second cylinder 221, and the support plate 225 is connected to the clamp housing 3. The support plate 225 provides an installation position for the second cylinder 221.

[0028] In this embodiment, the clamp housing 3 includes a housing base plate 33, a housing upper seat 31, and multiple housing side plates 32. The multiple housing side plates 32 are connected sequentially around the periphery, and each of the multiple housing side plates 32 is located between the housing base plate 33 and the housing upper seat 31. The housing upper seat 31 is provided with a square hole for mounting the module cavity component 4. Preferably, there are four housing side plates 32. The housing base plate 33, the housing upper seat 31, and the four housing side plates 32 form an octahedral shape. The module cavity component 4 and the guide slide rail 124 are both connected to the housing upper seat 31. The second cylinder 221 is connected to one of the housing side plates 32, and the support plate 225 is connected to the housing base plate 33.

[0029] like Figure 10 As shown, in this embodiment, the white-field testing device 5 includes a white-field light source 51, a light source mounting bracket 52, a third cylinder 53, and a device mounting bracket 54. The white-field light source 51 is connected to the light source mounting bracket 52, and the third cylinder 53 is connected to the device mounting bracket 54. The output shaft of the third cylinder 53 is connected to the light source mounting bracket 52, and the axis of the output shaft of the third cylinder 53 is along the left-right direction. The device mounting bracket 54 is used to install and fix the white-field testing device 5. After the lens 61 of the camera module assembly 6 is facing the white-field testing device 5, the output shaft of the third cylinder 53 drives the light source mounting bracket 52 to move towards the camera module assembly 6. The light source mounting bracket 52 drives the white-field light source 51 to move, thereby bringing the white-field light source 51 closer to the lens 61 of the camera module assembly 6, thus ensuring that the light can cover the lens 61 of the camera module assembly 6 and ensuring the quality of the photos taken during the white-field test.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A final inspection method for a camera module, characterized in that, Includes the following steps: S1. Place the camera module assembly (6) on the loading fixture; S2. Fix the camera module assembly (6) with the loading clamp and power it on; S3. The loading fixture moves, and the camera module assembly (6) moves with the loading fixture until the lens (61) of the camera module assembly (6) is facing the white field test equipment (5). S4, The white field test equipment (5) provides light sufficient to cover the lens (61) of the camera module finished product (6); S5. The camera module assembly (6) takes a photo. If there are black spots or black blocks in the photo, the camera module assembly (6) is dirty inside. If there are no black spots or black blocks in the photo, the camera module assembly (6) is a qualified product. The loading fixture includes a module positioning device (1), an electrical connection device (2), a fixture housing (3), and a module cavity component (4) disposed on the fixture housing (3). The fixture housing (3) has an internal cavity, and the module cavity component (4) is provided with a mounting groove (41) for accommodating the camera module component (6), and the mounting groove (41) is provided with a clearance through hole (42) to connect the cavity with the outside. The module positioning device (1) includes a cavity pressing block (11) disposed on the clamp housing (3) and a first driving mechanism (12) capable of moving the cavity pressing block (11). The cavity pressing block (11) is provided with a module exposed groove (111). When the first driving mechanism (12) moves the cavity pressing block (11) above the mounting groove (41), a clamping space for fixing the camera module assembly (6) is formed between the cavity pressing block (11) and the module cavity component (4). The module exposed groove (111) exposes the lens (61) of the camera module assembly (6). When the first driving mechanism (12) moves the cavity pressing block (11) away from the mounting groove (41), the camera module assembly (6) can enter and exit the mounting groove (41). The electrical connection device (2) is disposed in the cavity. The electrical connection device (2) includes an RF pin connector (21) and a second drive mechanism (22). The RF pin connector (21) is located directly below the clearance through hole (42). The second drive mechanism (22) can drive the RF pin connector (21) to move in the up and down direction so that the RF pin connector (21) moves closer to or away from the clearance through hole (42). The second drive mechanism (22) includes a second cylinder (221), a flexible floating joint (222), and a connector mounting base (223) arranged sequentially from bottom to top. The axis of the output shaft of the second cylinder (221) is in the up and down direction. The RF pin connector (21) is mounted on the connector mounting base (223). The second drive mechanism (22) also includes a quick-connect fitting (226) with multiple air inlets. The air outlet of the quick-connect fitting (226) is connected to the second cylinder (221).

2. The final inspection method for camera module products according to claim 1, characterized in that, It also includes the following steps: S6. The loading fixture moves, and the camera module assembly (6) moves with the loading fixture until the loading fixture and the camera module assembly (6) return to the position in step S2. S7. Take out the camera module finished product (6).

3. The final inspection method for camera module products according to claim 2, characterized in that: The first drive mechanism (12) includes a first cylinder (121), a first connecting block (122), and two pressure block connecting seats (123). The first cylinder (121) is disposed on one side of the fixture housing (3). The first connecting block (122) is connected to the output shaft of the first cylinder (121). The axis of the output shaft of the first cylinder (121) is along the left-right direction. The two pressure block connecting seats (123) are respectively connected to the front and rear sides of the cavity pressure block (11), and the first connecting block (122) is connected to one of the pressure block connecting seats (123).

4. The final inspection method for camera module products according to claim 3, characterized in that: The clamp housing (3) is provided with a guide slide rail (124) on the front and rear sides respectively. The length direction of the two guide slide rails (124) is along the left and right direction. The two pressure block connecting seats (123) are slidably connected to the two guide slide rails (124) respectively.

5. The final inspection method for camera module products according to claim 4, characterized in that: The connector mounting base (223) is provided with multiple guide rods (224), and the module cavity component (4) is provided with guide holes (43) corresponding to the positions of the multiple guide rods (224). The axes of the guide rods (224) and the guide holes (43) are both along the vertical direction.

6. The final inspection method for camera module products according to claim 5, characterized in that: The second drive mechanism (22) also includes a support plate (225) connected to the lower part of the second cylinder (221), the support plate (225) being connected to the clamp housing (3).

7. The final inspection method for camera module products according to claim 6, characterized in that: The fixture housing (3) includes a housing base plate (33), a housing upper seat (31), and multiple housing side plates (32). The multiple housing side plates (32) are connected in sequence around the periphery. The multiple housing side plates (32) are all located between the housing base plate (33) and the housing upper seat (31). The housing upper seat (31) is provided with a square hole for installing the module cavity (4).

8. The final inspection method for camera module products according to claim 1 or 2, characterized in that: The white field testing equipment (5) includes a white field light source (51), a light source mounting bracket (52), a third cylinder (53), and an equipment mounting bracket (54). The white field light source (51) is connected to the light source mounting bracket (52), the third cylinder (53) is connected to the equipment mounting bracket (54), the output shaft of the third cylinder (53) is connected to the light source mounting bracket (52), and the axis of the output shaft of the third cylinder (53) is along the left-right direction.

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