Alignment of optical components along a predetermined reference optical path

Abstract

In order to align an optical module with an image sensor module including at least one image sensor, a test image is received along a first reference optical path by a reference optical element before being reflected along a second reference optical path to the image sensor module by a reference optical element. First, the alignment orientation of the image sensor module is calibrated relative to the reference optical element so that the test image on the second reference optical path is received by the image sensor. Subsequently, the reference optical element is replaced with the optical module. Next, the orientation of the optical module is adjusted so that the second optical path overlaps with the second reference optical path, thereby achieving optical alignment of the optical module with the image sensor module; and finally, the optical module is attached to the image sensor module.

Description

Technical Field

[0001] The present invention relates to a method for aligning optical components such as an optical image stabilizer (OIS) module and an image sensor module with each other. Background Art

[0002] Image modules are commonly used in portable consumer devices such as mobile phones, tablets, and laptops to provide imaging capabilities. Due to technological advancements, the quality of image modules used in these portable devices is also improving. Therefore, precise alignment of the optical modules and image sensor modules of these image modules has become very important to achieve higher image quality when capturing images.

[0003] During the assembly of an imaging module, such as an imaging module in a camera of a portable consumer device, the image sensor of the image sensor module needs to be aligned with an optical module that provides functions such as image stabilization to obtain the best quality image. Typically, the alignment process involves a device that makes certain assumptions about the orientation of the optical path and the arrangement of the image sensor and optical module. For some imaging modules, this device may not be suitable for alignment and may result in alignment errors.

[0004] It would be beneficial to provide an apparatus suitable for aligning these imaging modules. Summary of the invention

[0005] It is therefore an object of the present invention to provide a technique that overcomes at least some of the above-mentioned problems of the prior art.

[0006] According to a first aspect of the present invention, there is provided a method for aligning an optical module with an image sensor module comprising at least one image sensor, the method comprising: receiving a test image along a first reference optical path through a reference optical element, and reflecting the test image along a second reference optical path through the reference optical element; adjusting the alignment orientation of the image sensor module to receive the test image on the second reference optical path to the image sensor, and determining a calibrated alignment orientation of the image sensor module relative to the reference optical element using the test image received by the image sensor, thereby achieving optical alignment of the image sensor module with the reference optical element; replacing the reference optical element with the optical module to be attached to the image sensor module, so as to receive the test image along the first reference optical path through the optical module, and reflect the test image along the second optical path through the optical module; adjusting the orientation of the optical module so that the second optical path overlaps with the second reference optical path, thereby achieving optical alignment of the optical module with the image sensor module; and fixing the optical module to the image sensor module.

[0007] According to the first aspect, there are the following problems in aligning an optical module with an image sensor module: both the image sensor module and the optical module may need to be independently aligned, and the physical arrangement of the optical module and the image sensor module may make it difficult to perform such alignment. Accordingly, a method is provided. The method can be used to align an optical module relative to an image sensor module. The image sensor module may include at least one image sensor. The method may include receiving a test image through a reference optical element or receiving a test image at a reference optical element. The test image may be received along a first reference optical path. The method may include: reflecting or projecting the test image along a second reference optical path through the reference optical element. The method may include: regulating or adjusting the alignment orientation of the image sensor module so that the test image is received along the second reference optical path to the image sensor. The method may include: determining a calibration alignment orientation of the image sensor module relative to the reference optical element using the test image received by the image sensor, thereby achieving optical alignment of the image sensor module with the reference optical element. The method may include: replacing or substituting the reference optical element with the optical module to be fixed to the image sensor module. The optical module may receive the test image along the first reference optical path, and may also reflect or project the test image along the second optical path. The method may include: regulating or adjusting the orientation of the optical module so that the second optical path overlaps or aligns with the second reference optical path, thereby achieving optical alignment of the optical module with the image sensor module. The method may include: fixing the optical module to the image sensor module. In this way, the alignment orientation of the image sensor module is first calibrated using the reference optical element so that the image sensor module is aligned with the second reference optical path; then, the reference optical element is replaced by the optical module; and then, the orientation of the optical module is adjusted so that it is reflected or projected along the second reference optical path before being fixed to the image sensor module. This method ensures that the image sensor module and the optical module are optically aligned before being fixed.

[0008] The position of the second reference optical path relative to the first reference optical path may depend on reflections from a reference optional element reflective surface of the reference optical element. Thus, due to the geometry of the reference optical element, the position of the second reference optical path may be fixed relative to the first reference optical path.

[0009] The first optical path may be substantially horizontal, and the second optical path may be substantially vertical. This allows the optical module to be superimposed on the image sensor module.

[0010] The method may include generating the test image using a test image generator, wherein the test image generator includes a lens for projecting the test image at an infinite object distance.

[0011] The method may include recording the calibration alignment position of the image sensor module for subsequent use. This enables the image sensor to be re-orientated to the calibration alignment position when required.

[0012] The method may include projecting the test image along a first optical path after the test image is reflected by a reflective surface of a path changer.

[0013] The method may include calibrating the position of the reference optical element to a calibration reference position, wherein when the reference optical element is in the calibration reference position, a reflection surface of the reference optical element is parallel to a reflection surface of the path converter.

[0014] The method may include calibrating the orientation of the reference optical element to a calibration reference orientation, wherein when the reference optical element is in the calibration reference orientation, one side of a reflective surface of the reference optical element is parallel to one side of a reflective surface of the path converter.

[0015] The reference optical element may comprise a mount having a mounting surface at a base, and the calibration may comprise the step of manipulating the reference optical element until the mounting surface is oriented horizontally. This provides a simple way to correctly position the reference optical element.

[0016] Adjusting the mounting surface along the horizontal plane can orient the reflective surface of the reference optical element to a direction parallel to the reflective surface of the path changer.

[0017] The step of manipulating the reference optical element may include clamping the reference optical element by an optical module holder, and actuating the optical module holder to reorient the reference optical element relative to a horizontal plane.

[0018] The method may include recording the calibration reference position of the reference optical element for subsequent use. This enables the reference optical element to be re-orientated to the calibration reference position when required.

[0019] The method may include orienting a reflective surface of the optical module to an initial position by activating at least one motor prior to actuating the optical module holder.

[0020] The method may include positioning the optical module relative to the image sensor module in a fixed position along the second optical path prior to actuating the optical module holder.

[0021] The step of regulating the alignment orientation of the image sensor module may include receiving the image sensor module via an image sensor module station and actuating the image sensor module station to reorient the image sensor module relative to the reference optical element. Thus, moving the image sensor module station causes a corresponding movement of the image sensor module.

[0022] The method may include actuating the image sensor module station to orient a surface of the image sensor module to a horizontal orientation to facilitate applying glue to the image sensor module.

[0023] The method may include moving the image sensor module placed on the image sensor module station to the fixed position and actuating the image sensor module station to orient the image sensor module to the calibration alignment position when the optical module is in the calibration alignment position before affixing the optical module to the image sensor to which glue has been applied.

[0024] The step of replacing the reference optical element with the optical module to be fixed to the image sensor module may comprise translating the common support so as to position the optical module at the location of the reference optical element in the calibration reference orientation.

[0025] The reference optical element and the optical module may be coupled to a common support of the optical module holder, and the step of replacing the reference optical element with the optical module to be fixed to the image sensor module comprises translating the common support to position the optical module to the position of the reference optical element.

[0026] The step of adjusting the orientation of the optical module may include: actuating the optical module holder to reorient the optical module relative to the image sensor module, and using the test image received by the image sensor to determine the calibration orientation of the optical module relative to the image sensor module, thereby achieving optical alignment of the optical module with the image sensor module.

[0027] The reference optical element and the optical element within the optical module may include at least one of a mirror and a prism.

[0028] The image sensor module may include an imaging zoom lens, and the regulating step may be performed with the imaging zoom lens set to an infinite focus position when the image sensor receives the test image.

[0029] The test image may include at least one unique image locating feature.

[0030] The test image may include a plurality of locating features that are different from the unique image locating features.

[0031] The unique image locating feature may be located at the center of the test image, and the plurality of locating features may be located around the unique image locating feature.

[0032] The unique image locating feature may include a central contrasting area.

[0033] The step of using a test image may include determining a position of the unique image locating feature projected onto the image sensor, and the adjusting may include adjusting the orientation to locate the unique image locating feature at the location on the image sensor.

[0034] Positioning the optical module includes positioning the optical module to a fixed position along the second optical path relative to the image sensor module at a glue coating distance before actuating the optical module holder.

[0035] The method may include recording the calibration position of the optical module for subsequent use.

[0036] Fixing the optical module to the image sensor module may include applying glue between the optical module and the image sensor module.

[0037] The method may include moving the image sensor module together with an image sensor module holder to a glue station and applying glue on a surface of the image sensor module to secure it to a surface of the optical module.

[0038] A second aspect of the present invention provides a device for executing the method described in the first aspect of the present invention.

[0039] The above and other features, aspects and advantages may be better understood with reference to the following description, appended claims and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings, in which:

[0041] Figure 1 shows the main components of an optical alignment apparatus according to one embodiment;

[0042] Figure 2 showing in greater detail components of the optical module holder located on a bottom surface of the optical module holder;

[0043] Figure 3 An exemplary technique for calibrating the position of a reference optical element is shown;

[0044] Figure 4 The use of a lookup camera to image the prism and reference optics to aid alignment is shown;

[0045] Figure 5 showing positioning of an image sensor module below a reference optical element;

[0046] Figure 6 shows translating the optical module holder to replace the reference optical element with the image stabilizer module;

[0047] Figure 7 The image sensor module is shown translated along the Z axis to a position below the image stabilizer module;

[0048] Figure 8 The image sensor module is shown being moved to a glue dispensing station for application of glue;

[0049] Fig. 9 shows moving the image sensor module from the dispensing station to below the image stabilizer module;

[0050] Fig.10 An exemplary method of aligning and securing an image sensor module to an image stabilizer module is shown.

[0051] In the drawings, similar parts are provided with similar reference numerals. DETAILED DESCRIPTION

[0052] First, an overview is provided before describing the embodiments in more detail. Some embodiments of the present invention provide a technique in which an image sensor module and an optical module are optically aligned with each other before the optical module (e.g., an image stabilizer module including a prism) is fixed to the image sensor module. The difficulty in doing so is that both the optical module and the image sensor module contain components that can move independently and affect the optical path, which makes optical alignment difficult to achieve. Therefore, it is very difficult to reliably determine how to position the optical module and the image sensor module so as to provide a correct optical alignment between the two. Accordingly, a multi-step method is used to sequentially align these components. First, a reference optical element is used to project a test image along a reference optical path. This reference optical path has a known and desired orientation and allows the image sensor module to be correctly oriented so that it is aligned with the reference optical path, and the image sensor module can receive the test image along the reference optical path. This fixes the optical alignment of the image sensor module. Since the calibration alignment position of the image sensor module is fixed, the reference optical element can be removed and the optical module to be fixed to the image sensor module is also in place. The image sensor module is held in the correct alignment, which means that the orientation of the optical module can be adjusted so that the test image is again received by the sensor module along the reference optical path. Once this happens, both the image sensor module and the optical module are correctly oriented and thus optically aligned. The image sensor module and the optical module can then be fixed to each other.

[0053] Optical Alignment Equipment

[0054] Figure 1 An optical alignment device 10 according to an embodiment is shown. The optical alignment device 10 includes a relay lens system 20 that transmits a test image including an image of a horizontally oriented test chart 30, wherein the test image is projected onto a reflective surface 50 of a main lens assembly unit 40 and a prism 60. In this embodiment, the relay lens system 20 is used to initially project the image of the test chart 30 substantially vertically onto the reflective surface 50, which then projects the test image along a first reference optical path 70, which in this embodiment is oriented substantially horizontally.

[0055] A movable, rotatable, six-degree-of-freedom optical module holder 80 is provided. That is, the optical module holder 80 can be moved and rotated along substantially horizontal and vertical planes and planes perpendicular to these two planes. The optical module holder 80 includes a pair of clamping arms 90, 100, which are used to hold a reference optical element 110, in this embodiment, a 45° prism in a fixed spatial configuration relative to the clamping arms 90, 100, as described below. The clamping arms 90, 100 also releasably hold an optical module in the form of an image stabilizer module 120, which contains an optical element 130 (in this embodiment, the optical element 130 is a prism) and an actuator (not shown), which is operable to: move the optical module in space relative to the image stabilizer module 120 in response to a signal provided by an electrical connector such as a spring pin 140.

[0056] Depend on Figure 1 It can be seen that the reflective surface 150 of the reference optical element 110 receives the image of the test chart 30 along the first reference optical path 70 and projects the image along the vertically oriented second reference optical path 160, which will be described in detail below.

[0057] The image sensor module 170 is mounted at a fixed position in the image sensor module station 180. The image sensor module station 180 also has six degrees of freedom, which can be moved and rotated. That is, the optical module holder 80 can move and rotate along a substantially horizontal and vertical plane and a plane perpendicular to these two planes. The image sensor module 170 includes an image sensor 172 (such as Figure 5 ) and a telephoto lens unit 174 (see Figure 5 ). The telephoto lens unit 174 can be shifted relative to the image sensor 172 to mechanically optically zoom the image received by the image sensor module 170. The optical alignment of the telephoto lens unit 174 relative to the image sensor 172 is performed in accordance with US2020 / 0329181A1, the entire contents of which are incorporated herein by reference. The image sensor module 170 is operably connected to the image sensor signal connector board 190 via a flexible printed circuit (FPC) 185. The image sensor module 170, the FPC 185, and the image sensor signal connector board 190 are loaded onto the image sensor module station 180 as a single component. The image sensor signal connector board 190 is used to receive and send images imaged by the image sensor 172. The image sensor module 170 has a telephoto lens unit autofocus motor connector board 200, which is used to transmit signals to control the operation of the telephoto lens unit 174 within the image sensor module 170. When receiving a test image using the image sensor 172, the position of the telephoto lens unit 174 can be set to an infinite focus position.

[0058] Figure 2 The components of the optical module holder 80 are shown in greater detail. The optical module holder 80 is flipped on its side to show the components on the bottom surface of the optical module holder. In particular, it can be seen that the reference optical element 110 is mounted on the clamping arm 100 via the mounting member 210. The mounting member 210 has a mounting surface 220 located at the base of the optical module holder 80 for calibrating the orientation of the reference optical element 110. This will be described in more detail below.

[0059] Calibration Reference Optics

[0060] Figure 3 An exemplary technique for calibrating the orientation of the reference optical element 110 is shown. It can be seen that when the reflective surface 150 of the reference optical element is at a 45° angle to the horizontal plane, the mounting surface 220 is substantially horizontal. This enables the reference optical element 110 to be oriented to a calibrated reference orientation to ensure that the reflective surface 150 receives the image of the test chart 30 horizontally along the first reference optical path 70 and projects the test image vertically along the second reference optical path 160.

[0061] The reference optical element 110 is oriented to a calibration reference orientation using a laser measuring device 230 located on a horizontal plane that is disposed on a horizontal plane and distance measurements are taken at different locations on the mounting surface 220. Typically, three or more measurements are taken, which are used to determine whether the optical module holder 80 needs to be reoriented to reduce the difference between the measurements. When the laser measuring device 230 records matching measurements at least three different locations on the mounting surface 220, the mounting surface 200 will be oriented in the horizontal plane, ensuring that the reflective surface 150 is in the correct orientation, at a 45° angle to the horizontal plane and parallel to the reflective surface 50. It is noted that a similar technique can be used to calibrate the orientation of the relay lens system 20 by taking measurements from the base 240 of the prism 60 to ensure that the base 240 of the prism 60 is oriented in the horizontal plane.

[0062] like Figure 4 As shown, the facing edges of the prism 60 and the reference optical element 110 can be imaged using a search camera 250 to ensure that they are aligned parallel to each other in space. The optical module holder 80 can be moved and / or reoriented to ensure that the facing edges of the prism 60 and the reference optical element 110 are aligned parallel to each other in space, and can be repeatedly measured by the laser measurement device 230. This process can be repeated until the mounting surface 220 is oriented in a horizontal plane and the facing edges of the prism 60 and the reference optical element 110 are aligned parallel to each other in space. The final position and orientation of the optical element holder 80 is recorded on the optical alignment device as a calibration reference orientation.

[0063] Thus, after this calibration, an image of the test chart 30 may be projected vertically through the main lens assembly unit 40 and reflected horizontally along the first reference optical path 70 where it is received by the reference optical element 110 (which is properly positioned and oriented in the calibration reference orientation) which in turn reflects the test image vertically along the second reference optical path 160 and onto the image sensor module 170.

[0064] Calibrating the Image Sensor Module

[0065] As described above, the image sensor 172 and the telephoto lens unit 174 within the image sensor module 170 have been optically aligned. Fig.10 In step 1, the image sensor module 170 (along with the FPC 185 and the image sensor signal connector board 190) is loaded onto the image sensor module station 180, and the image stabilizer module 120 is loaded into the optical module holder 80. Figure 5 As shown, the image sensor module 170 is positioned below the reference optical element 110 by the image sensor module station 180. The telephoto lens unit autofocus motor connector board 200 is used to power the autofocus motor of the telephoto lens unit 174, the image sensor signal connector board 190 is used to power the image sensor 172, and the pogo pins 140 are used to power the motor of the image stabilizer module 120. The test image projected by the reference optical element 110 can be captured by the image sensor 172 and transmitted on the image sensor signal connector board 190.

[0066] return Fig.10 In step 2, based on these captured images, the actual framing direction of the telephoto lens unit 174 can be determined. If there is any error and the test image does not fall correctly on the image sensor 172 (for example, the center pattern of the test chart is not correctly located at the center pixel of the image sensor), the alignment position of the image sensor module 170 can be appropriately adjusted by moving and / or reorienting the image sensor module station 180 so that the image sensor module 170 is correctly aligned with the second reference optical path 160. The position and alignment orientation of the image sensor module station 180 are recorded on the optical alignment device as the correct alignment orientation of the image sensor module.

[0067] Now that the image sensor module 170 has been aligned with the second reference optical path 160 , the process of orienting and bonding the image stabilizer module 120 to the image sensor module 170 may begin.

[0068] Alignment of image stabilizer module / image sensor module

[0069] In step 3, the optical module holder 80 is translated along the X-axis while maintaining the image sensor module 170 in the calibration alignment position, such as Figure 6 As shown, the image stabilizer module 120 is positioned at the position of the reference optical element 110 .

[0070] Next, if Figure 7 As shown, the image sensor module 170 is translated upward along the Z-axis by the image sensor module station 180 to a position directly below the image stabilizer module 120. The image sensor module 170 and the image stabilizer module 120 are kept at a distance apart so that the image stabilizer module 120 can be slightly reoriented.

[0071] Back to Fig.10 In step 4, the motors of the image stabilizer module 120 are initialized and moved to the initial position on all motor channels by providing signals on the pogo pins 140. Once the optical element 130 is in the initial position, the image of the test chart 30 projected by the optical element 130 into the image sensor module 170 will be imaged by the image sensor 172. By viewing the image of the test chart 30 captured by the image sensor 172 provided via the image sensor signal connector board 190, it is possible to check for proper compensation of any error in the framing direction caused by misalignment of the optical element 130. If there is any difference between the image captured by the image sensor 172 and the image previously provided by the reference optical element 110, it can be concluded that the optical element 130 was not oriented to an orientation that accurately matched the reference optical element 110 in its original initial position. Therefore, the optical module holder 80 needs to reorient the optical element 130 to compensate for this error through proper calibration. This compensation process may be repeated until the captured image of the test chart 30 matches the captured image from the reference optical element 110, meaning that the reference optical element 110 is now properly oriented to receive an image of the test chart 30 along the first reference optical path 70 (horizontally) and reflect the test image 30 along the second reference optical path 160 (vertically) to the image sensor 172.

[0072] After aligning the alignment orientation of the image sensor module 170 to the image stabilizer module 120, the image sensor module 170 is moved along the Z axis to a suitable separation distance from the bottom surface of the image stabilizer module 120 so that there is enough space to apply glue for fixing the image stabilizer module 120 to the image sensor module 170. Therefore, the gap should be large enough so that a predetermined amount of glue can be applied between the image stabilizer module 120 and the image sensor module 170. Again, the image provided by the image sensor 172 of the image sensor module 170 is aligned with the bottom surface of the image stabilizer module 120. Figure 5The image recorded in the image is compared and the orientation of the optical module holder 80 is adjusted until the images match. Then, the orientation of the optical module holder 80 is recorded.

[0073] Alignment of image stabilizer module / image sensor module

[0074] In step 5, the image sensor module 170 is moved to the dispensing station 185 by moving the image sensor module station 180, such as Figure 8 Typically, the image sensor module station 180 is reoriented to its pre-calibrated position, where the top surface of the image sensor module 170 is located on a horizontal plane to facilitate glue dispensing by the glue dispensing station 185. This is because the top surface of the image sensor module 170 should be reasonably flat (i.e., not tilted and should be located on a generally horizontal plane) to maintain an even distribution of glue during the glue dispensing process.

[0075] Back to Fig.10 In step 6, after dispensing, the image sensor module station 180 is moved back to Figure 7 The optical module holder 80 is moved to the position shown in step 2 and redirected to the alignment position recorded in step 2, as shown in FIG9. The optical module holder 80 maintains the calibration reference position recorded in step 4. Then, the curing assembly 260 is activated to cure the glue. In the present embodiment, the glue is an ultraviolet (UV) glue that is curable by ultraviolet light, so the curing assembly 260 includes a plurality of UV lamps. Once the glue is cured, the image stabilizer module 120 is fixed in the correct position and orientation relative to the image sensor module 170, and the optical module holder 80 can be opened. Then, the combined image stabilizer module 120 / image sensor module 170 can be removed from the image sensor module station 180.

[0076] The process may then return to step 1, where a new image sensor module 170 is positioned on the image sensor module station 180 and a new image stabilizer module 120 is received by the optical module holder 80. Steps 2 to 6 are then repeated before the combined unit (i.e., the image stabilizer module 120 attached to the image sensor module 170) is removed from the image sensor module station 180.

[0077] Although the present invention has been described in considerable detail with reference to certain embodiments, other embodiments are possible.

[0078] Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

Claims

1. A method for aligning an optical module with an image sensor module comprising at least one image sensor, It is characterized in that The method comprises: receiving a test image along a first reference optical path through a reference optical element, and reflecting the test image along a second reference optical path through the reference optical element; adjusting the alignment position of the image sensor module to receive the test image on the second reference optical path to the image sensor, and using the test image received by the image sensor to determine the calibration alignment position of the image sensor module relative to the reference optical element, thereby achieving optical alignment of the image sensor module with the reference optical element; replacing the reference optical element with the optical module to be fixed to the image sensor module so as to receive the test image along the first reference optical path through the optical module and reflect the test image along the second optical path through the optical module; adjusting the orientation of the optical module so that the second optical path overlaps with the second reference optical path, thereby achieving optical alignment between the optical module and the image sensor module; and The optical module is fixed to the image sensor module.

2. The method according to claim 1, It is characterized in that The step of projecting the test image along the first reference optical path only after the test image is reflected by the reflective surface of the path converter is included.

3. The method according to claim 2, It is characterized in that The method comprises calibrating the position of the reference optical element to a calibration reference position, wherein when the reference optical element is in the calibration reference position, the reflection surface of the reference optical element is parallel to the reflection surface of the path converter.

4. The method according to claim 3, It is characterized in that The reference optical element includes a mount having a mounting surface at a base, and the calibration includes the step of manipulating the reference optical element until the mounting surface is oriented along a horizontal plane.

5. The method according to claim 4, It is characterized in that The step of manipulating the reference optical element includes holding the reference optical element by an optical module holder and actuating the optical module holder to reorient the reference optical element relative to the horizontal plane.

6. The method according to claim 5, It is characterized in that Also included is orienting a reflective surface of the optical module to an initial position by activating at least one motor prior to actuating the optical module holder.

7. The method according to claim 5, It is characterized in that Also included is positioning the optical module relative to the image sensor module to a fixed position along the second optical path prior to actuating the optical module holder.

8. The method according to claim 1, It is characterized in that The step of regulating the aligned orientation of the image sensor module includes receiving the image sensor module by an image sensor module station and actuating the image sensor module station to reorient the image sensor module relative to the reference optical element.

9. The method according to claim 8, It is characterized in that Also included is actuating the image sensor module station to orient the surface of the image sensor module onto a horizontal plane for applying glue to the image sensor module.

10. The method according to claim 9, It is characterized in that The method also includes moving the image sensor module together with the image sensor module station to the fixed position, and actuating the image sensor module station to orient the image sensor module to the calibration alignment position when the optical module is in the calibration alignment position before affixing the optical module to the image sensor to which the glue has been applied.

11. The method according to claim 1, It is characterized in that The reference optical element and the optical module are coupled to a common support of the optical module holder; the step of replacing the reference optical element with the optical module to be fixed to the image sensor module includes: translating the common support to position the optical module to the position of the reference optical element.

12. The method according to claim 11, It is characterized in that The step of adjusting the orientation of the optical module includes: actuating the optical module holder to reorient the optical module relative to the image sensor module, and determining a calibration orientation of the optical module relative to the image sensor module using the test image received by the image sensor, thereby achieving optical alignment of the optical module with the image sensor module.

13. The method according to claim 1, It is characterized in that The reference optical element and the optical module include at least one of a mirror and a prism.

14. The method according to claim 1, It is characterized in that The image sensor module comprises an imaging zoom lens; when the image sensor receives the test image, the alignment position of the image sensor module is regulated when the imaging zoom lens is set to an infinite focus position.

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