Relative active alignment device

Abstract

The present specification relates to an active alignment device comprising: a support unit supporting a camera module; a screen forming a correction pattern for optical axis correction of the second lens module and reflecting second light corresponding to an incident range of the first light; a clamping unit which transmits the first light and the second light and corrects the optical axis of the second lens module; and a control unit that, if a correction pattern image corresponding to the second light is input from the second lens module, controls optical axis correction of the second lens module according to a position difference between the correction pattern image and a set reference pattern image; the clamping unit uses a transparent glass that transmits the second light such that the second light is transmitted through the transparent glass and incident on the second lens module.

Description

Technical Field

[0001] The present invention relates to a relative active alignment device, and more particularly, to a relative active alignment device that corrects the optical axis between a first lens module and a second lens module included in a laser module and is installed. Background Art

[0002] Generally, a laser module can emit laser light and can receive the emitted laser light.

[0003] That is, the laser module can provide a stereoscopic image, and the laser module may include: a first lens module that emits laser light; and a second lens module that receives the emitted laser light to generate an image.

[0004] After performing an assembly process using such a laser module, an inspection process can be performed by an inspection device.

[0005] Through the assembly process, the first lens module of the laser module can be combined with a cover body on which a light-emitting element is mounted on a PCB (printed circuit board).

[0006] In addition, the second lens module of the laser module includes a lens barrel having a lens built therein and a lens holder coupled to the lens barrel, and the lens holder can be combined with the cover body in which an image sensor is mounted on the PCB substrate.

[0007] After that, in order to fix the lens barrel and the lens holder, epoxy resin can be coated between the lens barrel and the lens holder and cured, thereby completing the assembly of the laser module.

[0008] In order to accurately assemble the laser module, an active alignment device can be used.

[0009] The active alignment device is an assembly device that accurately assembles the laser module by obtaining a plurality of position information with respect to the PCB substrate when assembling the lens holder to the cover body.

[0010] In the active alignment device, the laser module can be assembled in a state where the level of a chart or a light source is kept consistent with the level of the PCB substrate, or the laser module can be assembled in a state where the level of the chart or the light source is kept consistent with the level of the lens barrel.

[0011] However, since the PCB substrate, the light-emitting element, and the image sensor constituting the laser module are connected to each other by solder balls, there may be an installation error between the light-emitting element, the image sensor, and the PCB substrate, and there may also be an installation error between the lens and the lens holder.

[0012] Therefore, when assembling the laser module with the chart or light source aligned with the level of the PCB substrate, or when checking the camera module after assembling the laser module with the chart or light source aligned with the level of the lens barrel, due to the mounting errors of the light-emitting element and the image sensor on the PCB substrate and the mounting error of the lens holder, the inspection results may be incorrect.

[0013] At this time, the errors of the first lens module and the second lens module can be corrected through separate processes.

[0014] That is, the first lens module can align the optical axis of the light-emitting element based on the camera installed in the device, and the second lens module can align the optical axis using a separately provided chart.

[0015] However, since the first lens module and the second lens module are aligned based on different benchmarks respectively, alignment errors of the optical axes of the first lens module and the second lens module, that is, the above-mentioned mounting errors, may occur.

[0016] In recent years, research has been underway to align the optical axes of the first lens module and the second lens module by simultaneously using the first lens module and the second lens module.

[0017] On the other hand, in Korean Patent Publication No. 10-2022-0021769 (published on February 22, 2022) (hereinafter referred to as the prior art document), a technique is disclosed in which the laser of the light-emitting part is emitted to the screen using a glass vacuum chamber, and the lens of the light-receiving part is optically aligned according to the result of receiving the laser reflected from the screen.

[0018] However, in the case of the above-mentioned prior art document, there is a concern that the laser emitted from the light-emitting part may be distorted, refracted or reflected through the surface of the glass vacuum chamber, thereby affecting the laser incidence of the light-receiving part.

[0019] In this case, a problem may occur in that it is difficult to accurately form the alignment of the lens of the light-receiving part due to inaccurate laser incidence. As a result, the quality and performance of the product cannot be ensured, and there are certain limitations.

[0020] That is, in the past, problems have occurred in the laser emission of the light-emitting part due to the glass surface. As a result, it is difficult to achieve accurate installation, and thus the above-mentioned mounting errors cannot be completely prevented. Summary of the Invention

[0021] Problems to be Solved by the Invention

[0022] An object of the present invention is to provide a relative active alignment device that corrects an optical axis between a first lens module and a second lens module included in a laser module and mounts them.

[0023] In particular, an object of the present invention is to provide a relative active alignment device that can improve the problem of inaccurate optical axis correction caused by refraction, distortion, or reflection of laser light emitted from a light emitting unit to a screen via a glass surface.

[0024] In addition, an object of the present invention is to provide a relative active alignment device that, in an assembly process of a laser module, can correct the optical axes of a first lens module and a second lens module according to a correction pattern image emitted from the second lens module, and the correction pattern image output from the second lens module corresponds to second light that first light emitted from the first lens module is incident on a screen.

[0025] The object of the present invention is not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned can be understood through the following description and can be further clearly understood through the embodiments of the present invention. In addition, it can be easily known that the objects and advantages of the present invention can be achieved by the means and combinations thereof given in the scope of the claims.

[0026] Technical solution for solving the problem

[0027] The relative active alignment device according to an embodiment of the present invention for solving the above problems is an active alignment device for correcting the optical axis of a camera module, including: a first lens module that emits first light; and a second lens module that is separated from the first lens module and receives incident second light. The active alignment device includes: a support unit that supports the camera module; a screen that forms a correction pattern for correcting the optical axis of the second lens module and reflects the second light corresponding to the incident range of the first light; a clamping unit that allows the first light and the second light to pass through and corrects the optical axis of the second lens module; and a control unit that, if a correction pattern image corresponding to the second light is input from the second lens module, controls the optical axis correction of the second lens module based on a position difference obtained by comparing the correction pattern image and a set reference pattern image; the clamping unit includes a transparent glass that allows the second light to pass through, so that the second light passes through the transparent glass and is incident on the second lens module.

[0028] In one embodiment, the correction pattern may include a plurality of spots spaced at a constant interval.

[0029] In one embodiment, at least one of the plurality of light spots may have different shapes and different brightness levels.

[0030] In one embodiment, the transparent glass may be formed to include at least a part of the incident range of the second light reflected from the screen.

[0031] In one embodiment, the transparent glass may be formed not to include the emission range of the first light emitted from the first lens module.

[0032] In one embodiment, the transparent glass may be located on the upper side of the second lens module.

[0033] In one embodiment, the second lens module includes: a lens barrel with a lens built therein; and a lens holder that is bonded to the lens barrel using epoxy resin and fixed to a cover body bonded to the first lens module; the clamping unit may include a clamping portion that is configured with the transparent glass and clamps the lens barrel to correct the optical axis according to the control of the control unit.

[0034] In one embodiment, the clamping portion may include: a clamp that clamps the lens barrel to correct the optical axis; and a vacuum flow path that is formed in the lower part and side surface of the transparent glass and is formed to suck air so that the clamp clamps the lens barrel.

[0035] In one embodiment, the clamp may be formed on the central axis of the transparent glass.

[0036] In one embodiment, when an external air suction device operates to make the clamp clamp the lens barrel, the transparent glass can contact the upper part where the vacuum flow path is exposed to seal the space between the vacuum flow path and the transparent glass.

[0037] In one embodiment, when the clamp clamps the lens barrel, the transparent glass may be spaced apart from the lens barrel by a predetermined interval.

[0038] In one embodiment, the control unit may include: an operation portion that operates the first lens module to emit the first light; a positioning portion that determines the position difference by comparing the correction pattern image input from the second lens module and the reference pattern image; and a control portion that controls the clamping unit so that the optical axis of the second lens module is corrected according to the position difference.

[0039] In one embodiment, the reference pattern image may be an image corresponding to the correction pattern formed within the incident range of the first light.

[0040] In one embodiment, the positioning unit can determine whether there is a deviation in at least one of the up-down and left-right directions by comparing a plurality of light spots included in the calibration pattern image with a plurality of reference light spots included in the reference pattern image, and can determine the position difference based on the deviation direction and distance.

[0041] In one embodiment, the positioning unit extracts a first length and a first number of light spots in a first direction, and a second length and a second number of light spots in a second direction intersecting the first direction from the plurality of light spots, and compares the first length, the second length, the first number of light spots, and the second number of light spots with a first reference length, a second reference length, a first reference number of light spots, and a second reference number of light spots set in the plurality of reference light spots in the first direction and the second direction to determine whether there is such a deviation.

[0042] In one embodiment, if the first length is shorter than the first reference length and the first number of light spots is less than the first reference number of light spots, the positioning unit can determine that there is a deviation in the first direction, and can determine the position difference of moving in the opposite direction of the first direction based on the difference between the first length and the first reference length.

[0043] In one embodiment, if the second length is shorter than the second reference length and the second number of light spots is less than the second reference number of light spots, the positioning unit can determine that it is deviated in the second direction, and can determine the position difference of moving in the opposite direction of the second direction based on the difference between the second length and the second reference length.

[0044] In one embodiment, the control unit can control the clamping unit according to the position difference, so that the optical axis of the second lens module is corrected in a first direction and a second direction intersecting the first direction.

[0045] In one embodiment, a lens unit may further be included, and the lens unit changes the refractive indices of the first light and the second light between the support unit and the screen.

[0046] In one embodiment, the lens unit may include a collimator lens for distance adjustment.

[0047] Advantages of the Invention

[0048] According to the relative active alignment device of the present invention, since the optical axes of the first lens module and the second lens module can be corrected simultaneously during the assembly process of the laser module, it has the advantages of being able to simplify the manufacturing process and reduce installation errors.

[0049] In particular, in the relative active alignment device according to the present invention, by disposing only the transparent glass on the light-receiving unit side and allowing only the laser incident on the light-receiving unit to pass through, it is possible to prevent the laser emitted from the light-emitting unit from being refracted, distorted, or reflected by the transparent glass surface.

[0050] Thus, in the relative active alignment device according to the present invention, since it is possible to prevent distortion during laser light reception of the light-receiving unit due to the influence of refraction, distortion, or reflection of the laser emitted from the light-emitting unit, it is possible to achieve the effect of forming stable laser light reception of the light-receiving unit.

[0051] In addition, in the relative active alignment device according to the present invention, since stable laser light reception of the light-receiving unit can be formed, it is also expected to achieve the effect of accurately forming the optical alignment of the light-emitting unit and the light-receiving unit.

[0052] Thus, in the relative active alignment device according to the present invention, not only can the quality and performance of the product be ensured, but also the effect of improving the reliability of product manufacturing can be achieved.

[0053] In addition, in the relative active alignment device according to the present invention, since the second light incident by using the first light emitted from the first lens module is utilized, there is an advantage that no additional chart is required to correct the optical axis of the second lens module.

[0054] In addition, various effects other than the above effects can be directly or implicitly disclosed in the detailed description of the embodiments of the present invention described later. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a control block diagram showing the control structure of the relative active alignment device of the present invention.

[0056] Figure 2 is an example diagram for explaining the operation of the relative active alignment device of the present invention.

[0057] Figure 3 is shown in Figure 1 an example diagram of a calibration pattern formed on the screen shown.

[0058] Figure 4 is for explaining Figure 1 the operation of the positioning portion shown in the example diagram.

[0059] Figure 5 is shown in Figure 1 a diagram of a first embodiment of the clamping unit shown.

[0060] Figure 6 is shown in Figure 1View of the second embodiment of the clamping unit shown Detailed description

[0061] It should be noted that in the following description, only the necessary parts for understanding the embodiments of the present invention will be described, and the description of other parts will be omitted to avoid confusing the gist of the present invention.

[0062] Hereinafter, the terms and words used in this specification and the claims should not be construed as being limited to the general and dictionary meanings, but should be interpreted based on the principle that the inventor can reasonably define the terms and concepts in order to explain his own invention in the best way, in accordance with the meanings and concepts that conform to the technical idea of the present invention. Therefore, the embodiments described in this specification and the structures illustrated in the drawings are only a preferred embodiment of the present invention and do not represent all the technical ideas of the present invention. Therefore, when applying for the present invention, this structure may have various alternative equivalents and variations.

[0063] Hereinafter, the embodiments of the present invention will be described in more detail with reference to the drawings.

[0064] Figure 1 is a control block diagram showing the control structure of the relative active alignment device of the present invention, and Figure 2 is an example diagram for explaining the operation of the relative active alignment device of the present invention.

[0065] Referring to Figure 1 and Figure 2 , the relative active alignment device 100 may include a screen 110, a support unit 120, a clamping unit 130, and a control unit 140.

[0066] First, the screen 110 may irradiate the laser module 1 with a second light L2 corresponding to the incident range of the first light L1 emitted from the laser module 1.

[0067] In an embodiment, the first light L1 may be a laser, and the second light L2 may be the emitted laser, but is not limited thereto.

[0068] Along the upper direction of the laser module 1, a calibration pattern for optical axis correction may be formed on the lower surface of the screen 110.

[0069] Among them, the calibration pattern may respectively include a plurality of spots with different brightness levels, but is not limited thereto.

[0070] The plurality of spots may be spaced apart at a predetermined interval and may have different shapes and different brightness levels from each other, but is not limited thereto.

[0071] In addition, the plurality of spots may be divided into a plurality of spot groups.

[0072] At this time, if the reflectivity of the lower surface of the screen is low, it is difficult to generate an image on the lower surface of the screen 110 due to the low brightness of the second light L2. If the reflectivity is high, although it is easy to generate an image of the second light L2, noise images of other parts other than the calibration pattern may be generated.

[0073] That is, in order to find the Z-axis value of the Best Focus point, active alignment can analyze the resolution of the image (numericalize the degree of blurring of the image caused by out-of-focus) to find the Z-axis value of the Best Focus point and calculate the Tilt correction value.

[0074] Therefore, in the case of low reflectivity, it is difficult to perform resolution analysis due to the low image brightness. In the case of high reflectivity, resolution analysis may be difficult due to the generation of noise images.

[0075] In the embodiment, the active alignment device 100 can use the cover to form a dark film with an internal reflectivity of 5%.

[0076] The support unit 120 can support the laser module 1.

[0077] First, the laser module 1 can include a first lens module 3, a second lens module 5, and a PCB substrate 9.

[0078] The first lens module 3 can include a first lens 4 above the light-emitting element 2 mounted on the PCB substrate 9, and the first lens 4 is combined with the cover 10.

[0079] Among them, the first lens 4 can emit the first light L1 emitted from the light-emitting element 2 to the screen 110.

[0080] At this time, the first lens 4 can diffuse the first light L1 along the set optical axis.

[0081] The second lens module 5 can include a lens barrel 6 with a second lens built therein, and a lens holder 7 that is combined with the lens barrel 6 using epoxy resin and fixed to the cover 10.

[0082] At this time, the second lens module 5 can be located above the image sensor 8 mounted on the PCB substrate 9.

[0083] The support unit 120 can support the laser module 1 to keep it horizontal.

[0084] The clamping unit 130 can include a transparent glass 132 and a clamping portion 134.

[0085] The transparent glass 132 can allow the second light L2 incident on the second lens module 5 to pass through.

[0086] That is, the transparent glass 132 does not participate in the emission of the first light L1, but only transmits the second light L2.

[0087] The transparent glass 132 can be formed in a shape that includes at least a part within the incident range of the second light L2 reflected by the screen 110.

[0088] In addition, the transparent glass 132 can be formed in a shape that does not include the emission range of the first light L1 emitted from the first lens module 3.

[0089] Such a transparent glass 132 can preferably be formed such that its area includes the entire incident range of the second light L2 but does not include the emission range of the first light L1.

[0090] In addition, the transparent glass 132 can be located above the second lens module 5.

[0091] Thus, the transparent glass 132 can transmit only the second light L2 without transmitting the first light L1.

[0092] For example, as Figure 5 and Figure 6 shown, it can be configured in the following manner: The transparent glass 132 is provided only above the second lens module 5 where the second light L2 is incident, so that the first light L1 cannot pass through and only the second light L2 can pass through.

[0093] At this time, the transparent glass 132 can be made of glass and can be a material with a very low refractive index.

[0094] In addition, the transparent glass 132 can be spaced apart from the lens barrel 5 by a predetermined distance.

[0095] The clamping part 134 can include a clamp 136 and a vacuum flow path 138.

[0096] The clamp 136 can grip the lens barrel 6. For example, the clamp 136 can grip the lens barrel 6 by air suction, or can contact and grip the lens barrel 6 from the upper side to the lower side, and is not limited thereto.

[0097] In addition, the clamp 136 can be configured with the transparent glass 132, capable of gripping the lens barrel 6 and correcting the optical axis. The clamp 136 can be formed on the central axis of the transparent glass 132.

[0098] The vacuum flow path 138 can be formed in the clamp 136 where the transparent glass 132 is disposed, and can be formed to clamp the lens barrel 6 by sucking air.

[0099] That is, when the external air suction device operates and the lens barrel 6 is clamped by the holder 136, the vacuum flow path 138 can contact the upper part where the transparent glass 132 is exposed, thereby sealing the space between the vacuum flow path 138 and the transparent glass 132.

[0100] The control unit 140 may include an operation unit 142, a positioning unit 144, and a control unit 146.

[0101] The operation unit 142 supplies power to the light-emitting element 2 to emit the first light L1, thereby enabling the first lens module 3 to be driven.

[0102] In addition, the operation unit 142 can receive the input of the calibration pattern image m corresponding to the second light L2 reflected by the screen 110 from the image sensor 8 and transmit it to the positioning unit 144.

[0103] The positioning unit 144 can determine the position coordinate value c by comparing the calibration pattern image m with the set reference pattern image.

[0104] The reference pattern image may be an image having the calibration pattern set corresponding to the second light L2 when the first light L1 is incident.

[0105] That is, the reference pattern image is an image of the calibration pattern in a state where the optical axes of the first lens module 3 and the second lens module 5 are calibrated.

[0106] The positioning unit 144 can determine the position coordinate value c corresponding to the deviation direction of the optical axis and the position coordinate difference by comparing a plurality of light spots included in the calibration pattern image m with a plurality of reference light spots included in the reference pattern image.

[0107] For example, the positioning unit 144 extracts the first length and the first number of light spots in the first direction and the second length and the second number of light spots in the second direction intersecting the first direction from the plurality of light spots, and compares the first length with the first reference length set in the plurality of reference light spots in the first direction, the second length with the second reference length set in the plurality of reference light spots in the second direction, the first number of light spots with the first reference number of light spots set in the plurality of reference light spots in the first direction, and the second number of light spots with the second reference number of light spots set in the plurality of reference light spots in the second direction, thereby being able to determine whether there is such a deviation.

[0108] In addition, if the first length is shorter than the first reference length and the number of first light spots is less than the number of first reference light spots, the positioning unit 144 can be determined to be deflected in the first direction, and the position difference of moving in the opposite direction of the first direction can be determined according to the difference between the first length and the first reference length.

[0109] In addition, if the second length is shorter than the second reference length and the number of second light spots is less than the number of second reference light spots, the positioning unit 144 can be determined to be deflected in the second direction, and the position difference of moving in the opposite direction of the second direction can be determined according to the difference between the second length and the second reference length.

[0110] The control unit 146 can move the clamping unit 130 according to the position coordinate value c determined by the positioning unit 144, so that the optical axis of the second lens module 5 is corrected.

[0111] In addition, the active alignment device 100 may further include a lens unit (not shown), and the lens unit is used to change the refractive indices of the first light L1 and the second light L2 between the screen 110 and the support unit 120.

[0112] Among them, the lens unit may include a collimator lens for distance adjustment.

[0113] The lens unit can reduce the size of the active alignment device 100 by reducing the distance between the screen 110 and the support unit 120.

[0114] As described above, since the active alignment device 100 of the present invention can correct the optical axis of the second lens module 5 by using the calibration pattern image c corresponding to the second light L2 within the incident range of the first light L1 emitted from the first lens module 3, it has the advantage of being able to simultaneously reduce the error of the optical axis between the first lens module 3 and the second lens module 5.

[0115] Figure 3 It shows being formed on Figure 1 An example diagram of a calibration pattern on the shown screen.

[0116] Referring to Figure 3 , the screen 110 may be formed with a calibration pattern in which a plurality of light spot groups each including a plurality of light spots are spaced apart at a constant interval.

[0117] Among them, each of the plurality of light spots may be composed of nine pixels with different brightness levels, that is, different brightnesses, and is not limited thereto.

[0118] Figure 3The calibration pattern shown is a diagram showing an example, which can be formed into other patterns and is not limited thereto.

[0119] A plurality of light spots can be formed to have the same width as each other and an interval rd between the light spots, and is not limited thereto.

[0120] Figure 4 is for explaining Figure 1 An example diagram of the operation of the positioning portion shown.

[0121] Referring to Figure 4 , the positioning portion 144 can determine the position coordinate value c by mutually comparing the calibration pattern image m and the reference pattern image.

[0122] Figure 4 (a) As a diagram showing the reference pattern image, a plurality of light spots can have: a first reference light spot length rw1 in the first direction and a first reference light spot number (not shown), and a second reference light spot length rh1 in the second direction intersecting the first direction and a second reference light spot number (not shown).

[0123] In addition, each of the plurality of light spots can be separated by a constant interval rd.

[0124] Figure 4 (b) Can represent the calibration pattern image m.

[0125] At this time, the positioning portion 144 can confirm the first length rw and the first light spot number (not shown) in the first direction of the plurality of light spots included in the calibration pattern image m, and the second length rh and the second light spot number (not shown) in the second direction intersecting the first direction.

[0126] Then, the positioning portion 144 can mutually compare the first length rw with the set Figure 4 (a) The first reference light spot length rw1 in, the second length rh with the set Figure 4 (a) The second reference light spot length rh1 in, the first light spot number with the set Figure 4 (a) The first reference light spot number in, and the second light spot number with the set Figure 4 (a) The second reference light spot number in.

[0127] Among them, according to Figure 4 (a) and Figure 4 (b), when the first length rw is shorter than the first reference light spot length rw1 and the first light spot number is less than the first reference light spot number, the positioning portion 144 can determine that there is a deviation in the first direction.

[0128] At this time, the positioning unit 144 can calculate the difference between the first length rw and the first reference spot length rw1 based on the constant interval rd between the plural spots.

[0129] In addition, the positioning unit 144 can determine the position difference c based on the difference, so that the optical axis moves in the opposite direction of the first direction.

[0130] The above position coordinate value c can be a value for correcting the optical axis of the second lens module 5.

[0131] Figure 5 It shows Figure 1 a diagram of the first embodiment of the clamping unit shown.

[0132] Referring to Figure 5 , the clamping unit 130 may include a transparent glass 132 and a clamping portion 134.

[0133] First, Figure 5 (a) is a cross-sectional perspective view of the clamping unit 130, Figure 5 (b) is a cross-sectional view of the clamping unit 130.

[0134] Referring to Figure 5 (a) and Figure 5 (b), in order to form the vacuum flow path 138, the transparent glass 132 may be formed in a trapezoidal cross-section, and the vacuum flow path 138 is used to allow air to flow while the holder 136 included in the clamping portion 134 clamps the lens barrel 6.

[0135] Among them, the transparent glass 132 may be configured in a form that only allows the second light L2 incident on the second lens module 5 after being reflected by the screen 110 to pass through.

[0136] For example, the transparent glass 132 may be formed in an area and position including the incident range of the second light L2, so that the second light L2 can pass through.

[0137] Thus, the first light L1 does not pass through the transparent glass 132 but is emitted to the screen 110, thereby preventing the influence caused by the refraction, distortion, or reflection of the first light L1 on the surface of the transparent glass 132.

[0138] Thus, it is possible to prevent the first light L1 from being refracted, distorted, or reflected on the surface of the transparent glass 132, and further prevent the phenomenon of affecting the light reception of the second light L2, so as to accurately form the light reception of the second light L2.

[0139] In order to clamp the lens barrel 6, when the holder 136 sucks air, the transparent glass 132 adsorbs to the upper surface exposed by the vacuum flow path 138, so that the space between the vacuum flow path 138 and the transparent glass 132 can be blocked.

[0140] At this time, the air sucked in by the gripper 136 can be discharged to an external air suction device via the vacuum flow path 138 through the air suction ports formed on the side, but this is not limited thereto.

[0141] Figure 6 It shows Figure 1 a diagram of a second embodiment of the gripper unit shown.

[0142] Referring to Figure 6 , the gripper unit 130 may include a transparent glass 132 and a gripping portion 134.

[0143] Figure 6 The gripper unit 130 shown is Figure 5 different from that shown, and can grip the lens barrel 6 using mechanical force instead of clamping by air suction.

[0144] The transparent glass 132 can allow the second light L2 reflected from the screen 110 to the second lens module 5 to pass through.

[0145] At this time, the transparent glass 132 may be made of glass and may be a material with a very low refractive index.

[0146] The gripping portion 134 may be combined with the gripper 136, and the transparent glass 132 may form a first hole h1 and a second hole h2 through which the first light L1 and the second light L2 pass.

[0147] In addition, the gripping portion 134 can operate the gripper 136 using the control unit 140, but is not limited thereto.

[0148] Among them, the first hole h1 may be located above the first lens module 3, and the second hole h2 may be located above the second lens module 5.

[0149] The diameter of the second hole h2 may be the same as or larger than the diameter of the first hole h1, and the first hole h1 and the second hole h2 may be formed to be equidistantly spaced from each other with the center of the transparent glass 132 as a reference.

[0150] Among them, the gripper 136 of the gripper unit 130 may descend from the upper side to the lower side of the second lens module 5 to grip the side surface of the second lens module 5.

[0151] The features, structures, and effects described in each of the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to a single embodiment. Further, the features, structures, and effects exemplified in each embodiment can be combined or modified by those of ordinary skill in the technical field to which the present invention pertains for other embodiments and implemented. Therefore, the content related to these combinations and modifications should be understood to be included within the protection scope of the present invention.

[0152] In addition, the above description is centered around the embodiments, but these are merely examples and do not limit the present invention. Those of ordinary skill in the art should understand that within the scope not departing from the essential features of the present embodiments, various deformations and application methods not listed above can also be carried out. For example, each of the constituent elements specifically presented in the embodiments can be implemented after being deformed. In addition, the differences related to these deformations and applications should be construed as being included within the scope of the present invention defined by the appended claims.

Claims

1. A relative active alignment device for the optical axis correction of a camera module, the camera module comprising: The first lens module emits first light; and a second lens module, spaced apart from the first lens module, and receiving incident second light, The relative active alignment device is characterized by comprising: a support unit for supporting the camera module; a screen that forms a calibration pattern for the optical axis calibration of the second lens module and reflects the second light corresponding to the incident range of the first light; a clamping unit that allows the first light and the second light to pass through and corrects the optical axis of the second lens module; and a control unit that, if a calibration pattern image corresponding to the second light is input from the second lens module, controls the optical axis calibration of the second lens module based on the position difference obtained by comparing the calibration pattern image and a set reference pattern image; The clamping unit includes a transparent glass that allows the second light to pass through, so that the second light passes through the transparent glass and is incident on the second lens module.

2. The relative active alignment device according to claim 1, wherein, The calibration pattern includes a plurality of light spots spaced at a constant interval.

3. The relative active alignment device according to claim 2, wherein, At least one of the plurality of light spots has a different shape and different brightness.

4. The relative active alignment device according to claim 1, wherein, The transparent glass is formed to include at least a part of the incident range of the second light reflected from the screen.

5. The relative active alignment device according to claim 1, wherein, The transparent glass is formed not to include the emission range of the first light emitted from the first lens module.

6. The relative active alignment device according to claim 1, wherein, The transparent glass is located above the second lens module.

7. The relative active alignment device according to claim 1, wherein, The second lens module includes: a lens barrel with a lens built therein; and a lens holder that is bonded to the lens barrel using epoxy resin and is fixed to a cover body combined with the first lens module; The clamping unit includes a clamping portion that is provided with the transparent glass and clamps the lens barrel, and corrects the optical axis according to the control of the control unit.

8. The relative active alignment device according to claim 7, wherein, The clamping portion includes: a clamp that clamps the lens barrel to correct the optical axis; and a vacuum flow path formed in the lower part and side surface of the transparent glass and configured to suck air to cause the clamp to clamp the lens barrel.

9. The relative active alignment device according to claim 8, wherein, The clamp is formed on the central axis of the transparent glass.

10. The relative active alignment device according to claim 8, wherein, When an external air suction device operates to cause the clamp to clamp the lens barrel, the transparent glass contacts the upper part where the vacuum flow path is exposed to seal the space between the vacuum flow path and the transparent glass.

11. The relative active alignment device according to claim 8, wherein, When the clamp clamps the lens barrel, the transparent glass and the lens barrel are spaced apart by a specified interval.

12. The relative active alignment device according to claim 1, wherein, The control unit includes: an operation portion that operates the first lens module to emit the first light; a positioning portion that determines the position difference by comparing the calibration pattern image input from the second lens module and the reference pattern image; and a control portion that controls the clamping unit so that the optical axis of the second lens module is corrected according to the position difference.

13. The relative active alignment device according to claim 12, wherein, The reference pattern image is an image corresponding to the calibration pattern formed within the incident range of the first light.

14. The relative active alignment device according to claim 12, wherein, The positioning unit determines whether there is a deviation in at least one of the up-down and left-right directions by comparing a plurality of light spots included in the calibration pattern image with a plurality of reference light spots included in the reference pattern image, and determines the position difference according to the deviation direction and distance.

15. The relative active alignment device according to claim 14, wherein, The positioning unit extracts a first length and a first number of light spots in a first direction, and a second length and a second number of light spots in a second direction intersecting the first direction from the plurality of light spots, and compares the first length, the second length, the first number of light spots, and the second number of light spots with a first reference length, a second reference length, a first reference number of light spots, and a second reference number of light spots set in the plurality of reference light spots in the first direction and the second direction to determine whether there is the deviation.

16. The relative active alignment device according to claim 15, wherein, If the first length is shorter than the first reference length and the first number of light spots is less than the first reference number of light spots, the positioning unit determines that there is a deviation in the first direction, and determines the position difference of moving in the opposite direction of the first direction according to the difference between the first length and the first reference length.

17. The relative active alignment device according to claim 15, wherein, If the second length is shorter than the second reference length and the second number of light spots is less than the second reference number of light spots, the positioning unit determines that there is a deviation in the second direction, and determines the position difference of moving in the opposite direction of the second direction according to the difference between the second length and the second reference length.

18. The relative active alignment device according to claim 12, wherein, The control unit controls the clamping unit according to the position difference, so that the optical axis of the second lens module is corrected in a first direction and a second direction intersecting the first direction.

19. The relative active alignment device according to claim 1, wherein, Further comprising: a lens unit that changes the refractive indices of the first light and the second light between the support unit and the screen.

20. The relative active alignment device according to claim 19, wherein, The lens unit includes a collimating lens for distance adjustment.

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