Fixing apparatus and method for multi-channel optical module lens designated position

Abstract

A multi-channel optical module lens position fixing device according to one embodiment of the present invention is a position fixing device for an optical module having an optical element, a lens, and an optical waveguide located on a sub-mount as a single optical path, and comprises an arm portion for picking up a lens, a control portion for adjusting the position of the arm portion, and a discharge portion disposed around the sub-mount that receives epoxy from the outside and discharges an amount of epoxy necessary for fixing between the sub-mount and the lens.

Description

Technology Field

[0001] The present invention relates to a device and method for fixing the position of a multi-channel optical module lens. Background Technology

[0002] Integration technology for optical modules is being developed in the form of parallel configurations with multiple channels. In particular, in the manufacturing of multi-channel optical modules, the integration of optical systems consisting of optical elements, lenses, and optical waveguides is becoming a critical factor in determining mass producibility and yield.

[0003] According to the prior art, the general structure of an optical module (10, 20, 30, 40) is such that light emitted from a light-emitting part (11a, 21a, 31a, 41a) located at the top of an optical element (11, 21, 31, 41) surface-mounted on a sub-mount (1) is focused into an optical waveguide (13, 23, 33, 43) via a lens (12, 22, 32, 42) (Figs. 1 and 2). In this structure, the lens (12) is bonded with epoxy (3) onto the bonding part (2) of the sub-mount (1). Since light efficiency may decrease depending on the gap between the lens (12) and the sub-mount (1) (e.g., D1, D3, and D4 in Fig. 3), it is important to apply an appropriate amount of epoxy (3) between them. The problem to be solved

[0004] The present invention is proposed to solve the aforementioned problems and aims to provide a device and method for fixing the correct position of a multi-channel optical module lens, which can actively control the appropriate amount of epoxy discharged by detecting the lens-submount gap that changes according to the thickness of the optical element during lens alignment and bonding of the multi-channel optical module.

[0005] The problems that the present invention aims to solve are not limited to those mentioned above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0006] A multi-channel optical module lens position fixing device according to one embodiment of the present invention is a position fixing device for an optical module having an optical element, a lens, and an optical waveguide located on a sub-mount as a single optical path, and comprises an arm portion for picking up a lens, a control portion for adjusting the position of the arm portion, and a discharge portion disposed around the sub-mount that receives epoxy from the outside and discharges an amount of epoxy necessary for fixing between the sub-mount and the lens.

[0007] At this time, it is desirable for the control unit to detect the gap between the lens and the sub-mount, which changes according to the position of the light-emitting part of the optical element, adjust the amount of epoxy ejected from the ejection part, and then drive control the dark part so that the lens is fixed in the designated position with the epoxy from the ejection part applied to the lower part of the lens. Effects of the invention

[0008] According to the present invention, by actively changing the amount of epoxy applied during lens bonding and according to changes in the gap between the lens and the submount, the amount of application is reduced in narrow gaps and increased in wide gaps, thereby maintaining a constant lower coating shape of the lens relative to a certain amount of epoxy applied.

[0009] Accordingly, it is possible to perform a process that maintains the mechanical strength of the epoxy bonding part while suppressing lens contamination. Brief explanation of the drawing

[0010] FIG. 1 is an example diagram illustrating a conventional multi-channel optical module lens alignment and epoxy bonding method. FIG. 2 is an example cross-sectional view of AA' shown in FIG. 1. Figure 3 is an example diagram illustrating the shape error of the bonding part due to the quantitative application of epoxy in the past. FIG. 4 is an exemplary configuration diagram illustrating a multi-channel optical module lens position fixing device according to one embodiment of the present invention. FIG. 5 is a block diagram illustrating the configuration of a control unit for implementing a multi-channel optical module lens position fixing device according to an embodiment of the present invention. FIG. 6 is a perspective view illustrating a discharge portion in a multi-channel optical module lens position fixing device according to one embodiment of the present invention. FIG. 7 is an example cross-sectional view of BB' shown in FIG. 6. FIGS. 8 to 12 are exemplary diagrams illustrating the process of discharging an appropriate amount of epoxy to be applied to the lower part of a lens in a multi-channel optical module lens position fixing device according to an embodiment of the present invention. FIG. 13 is an exemplary diagram illustrating the application of epoxy to the lower portion of a lens in a multi-channel optical module lens position fixing device according to one embodiment of the present invention. FIG. 14 is an exemplary diagram illustrating the quantitative application of epoxy per channel through a multi-channel optical module lens position fixing device according to one embodiment of the present invention. FIG. 15 is a block flowchart illustrating a method for fixing the position of a multi-channel optical module lens according to an embodiment of the present invention. FIG. 16 is a block flowchart illustrating an epoxy dispensing method in a method for fixing the position of a multi-channel optical module lens according to an embodiment of the present invention. Specific details for implementing the invention

[0011] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined by the claims. Meanwhile, the terms used in this specification are for describing the embodiments and are not intended to limit the present invention.

[0012] In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, “comprises” or “comprising” does not exclude the presence or addition of one or more other components, steps, actions, and / or elements other than those mentioned. As used herein, the term “and / or” includes any one of the listed items and all combinations of one or more of them.

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0014] Multichannel optical module lens position fixing device

[0015] FIG. 4 illustrates a multi-channel optical module lens position fixing device according to one embodiment of the present invention.

[0016] A multi-channel optical module lens position fixing device (100) according to one embodiment of the present invention comprises, mainly, an arm section (110), a control section (130), a discharge section (150), and a supply section (170).

[0017] The dark section (110) is responsible for the function of picking up a lens (12) to be fixed between an optical element (11) mounted on a sub-mount (1) and an optical waveguide (13 in FIG. 1).

[0018] These arm portions (110) include a gripper (111), a gripper arm (112), a load sensor (113), and a stage (114).

[0019] The gripper (111) is a device that can perform the role of a human finger in an automated motion and can perform a certain action of gripping or releasing the lens (12) according to a separate command.

[0020] The gripper arm (112) is an active mechanism with multiple degrees of freedom capable of assuming any position or posture, and has a gripper (111) attached to its tip. At this time, the gripper arm (112) is electrically connected to the gripper (111) and has a detachable structure.

[0021] A load sensor (113) is mounted on the rear end of the gripper arm (112). The load sensor (113) detects contact between the lens (12) and the sub-mount (1). For example, the load sensor (113) determines whether contact has occurred by comparing the initial electrical signal magnitude of the load sensor (113) with an electrical signal generated when a compressive force is applied to the load sensor (113) due to the lever principle of the gripper arm (112) when the gripper (111) picks up the lens (12).

[0022] The stage (114) is connected to the rear end of the gripper arm (112) with the load sensor (113) in between. The stage (114) can move in the positive and negative directions of the X-axis with respect to the coordinate system of FIG. 1 on a separate rail (not shown). As another example, the stage (114) can move in the X, Y, and Z axis directions.

[0023] The control unit (130) adjusts the position of the dark unit (110) and controls the overall operation of the lens position fixing device (100) of the multi-channel optical module.

[0024] The control unit (130) detects the gap between the lens (12), which changes according to the position of the light-emitting part (11a) of the optical element (11), and the sub-mount (1), adjusts the amount of epoxy ejected by the ejection unit (150), and then controls the driving of the arm (110) so that the lens (12) is fixed in the designated position with the epoxy of the ejection unit (150) applied to the lower part of the lens (12).

[0025] The discharge unit (150) is positioned around the sub-mount (1) and, after receiving epoxy from the supply unit (170), discharges an amount of epoxy necessary for fixing between the sub-mount (1) and the lens (12).

[0026] The supply unit (170) supplies a certain amount and / or a specific amount of epoxy to the discharge unit (150), and the supply operation can be controlled by the control unit (130).

[0027] Through the above configurations, we examine the mechanism by which the lens (12) is fixed to the sub-mount (1).

[0028] First, the lens (12) is picked up by the gripper (111) of the dark part (110) to determine the optimal position of the lens (12) to be fixed to the sub-mount (1) between the optical element (11) and the optical waveguide (13 in FIG. 1). Here, the optimal position of the lens (12) refers to the point of maximum light intensity where light emitted through the light-emitting part (11a) of the optical element (11) passes through the lens (12) and is focused into the optical waveguide (13 in FIG. 1).

[0029] After detecting whether there is contact between the lens (12) and the sub-mount (1) through the load sensor (113), the sensing value is compared with a reference value and calculated to secure the optimal position of the lens (12) where the maximum amount of light is focused according to the result.

[0030] When the optimal position of the lens (12) is secured, the control unit (130) commands the dispensing unit (150), which receives a certain amount and / or a specific amount of epoxy from the supply unit (170), to dispense an appropriate amount of epoxy suitable for the optimal position of the lens (12), and controls the arm unit (110) so that the lens (12) is fixed in the optimal position after applying the epoxy dispensed from the dispensing unit (150) to the lower part of the lens (12). In this process, the lens (12) can be fixed by an ultraviolet (UV) curing method.

[0031] In the case of the optical element (11), since a thickness error may occur due to a difference in the amount of polishing at each wafer position during the polishing process performed in the wafer state during manufacturing, the discharge unit (150) discharges epoxy differently for each channel (meaning multiple channels located at intervals along the X-axis, where one optical element-lens-optical waveguide is considered as one channel). That is, the discharge unit (150) discharges the appropriate amount of epoxy required for each channel according to the optimal position of each lens (12, 22, 32, 42 in FIG. 1).

[0032] Accordingly, the lens position fixing device (100) of a multi-channel optical module according to one embodiment of the present invention can prevent a decrease in light efficiency during the process in which the lens (12) is fixed to the sub-mount (1), regardless of the thickness (height) of the optical element (11).

[0033] If the thickness of the optical element (11) is thin, the gap between the lower part of the lens (12) and the sub-mount (1) becomes narrow, so the epoxy pushed out from the lower part of the lens (12) is applied along the surface of the lens (12) by surface tension, causing contamination or causing contamination in the path of light propagation, which may lead to a decrease in light efficiency. Conversely, if the thickness of the optical element (11) is thick, the gap between the lower part of the lens (12) and the sub-mount (1) becomes wide, and as the cross-section of the epoxy becomes narrower, it causes a decrease in mechanical strength and may become vulnerable to mechanical reliability tests (e.g., vibration test, impact test, etc.).

[0034] Consequently, even if the thickness (height) of the optical element (11) mounted on the sub-mount (1) for each channel varies according to the channel, the optical module position fixing device (100) can apply an appropriate amount of epoxy for each channel to prevent lens contamination by epoxy and secure the mechanical strength of the lens joint.

[0035] FIG. 5 illustrates the configuration of a control unit for implementing a lens position fixing device of a multi-channel optical module according to one embodiment of the present invention.

[0036] The control unit (130) is a computer system that oversees the overall operation of the lens position fixing device (100) of the multi-channel optical module.

[0037] The control unit (130) may include at least one of a processor (131) communicating via a bus (137), a memory (133), an input interface device (135), an output interface device (136), and a storage device (134). The control unit (130) may also include a communication device (132) connected to a network.

[0038] The input interface device (135) receives a sensing value from the load sensor (113 in FIG. 4).

[0039] The memory (133) stores a program that controls the performance of functions based on the result of comparing the sensing value and the reference value by the input interface device (135).

[0040] The processor (131) executes a program stored from memory (133).

[0041] The processor (131) may be at least one central processing unit (CPU) and / or a graphic processing unit (GPU), or a semiconductor device that executes instructions stored in memory (133) or a storage device (134).

[0042] The processor (131) may include a CPU, GPU, system-on-chip, microcontroller unit (MCU), etc. configured to control and manage the overall operation of the present invention.

[0043] The memory (133) and storage device (134) may include various forms of volatile or non-volatile storage media. For example, the memory may include ROM (Read Only Memory) and RAM (Random Access Memory). In the embodiment of the present description, the memory (133) may be located inside or outside the processor (131), and the memory (133) may be connected to the processor (131) through various known means.

[0044] Memory (133) is a volatile or non-volatile storage medium of various forms, and, for example, memory may include read-only memory (ROM) or random access memory (RAM).

[0045] Accordingly, embodiments of the present invention may be implemented as a method implemented on a computer or as a non-transient computer-readable medium in which computer-executable instructions are stored. In one embodiment, when executed by a processor (131), the computer-readable instructions may perform a method according to at least one aspect of the present description.

[0046] The communication device (132) can transmit or receive wired or wireless signals.

[0047] In addition, the method according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and may be recorded on a computer-readable medium. Here, the computer-readable medium may include program instructions, data files, data structures, etc., either individually or in combination.

[0048] Program instructions recorded on a computer-readable medium may be specially designed and configured for embodiments of the present invention, or they may be known and available to a person skilled in the art of computer software.

[0049] A computer-readable recording medium may include a hardware device configured to store and execute program instructions. For example, a computer-readable recording medium may be magnetic media such as hard disks, floppy disks, and magnetic tapes; optical media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; ROM; RAM; flash memory; etc. Program instructions may include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer through an interpreter, etc.

[0050] FIGS. 6 and FIGS. 7 illustrate the discharge section (150).

[0051] The discharge section (150) mainly comprises a body (151), a plunger (152), an actuator (153), a heat conduction cap (154), and a heater (155).

[0052] First, the body (151) is formed in a hollow shape and may be made of a transparent material so that the internal state can be monitored. This body (151) includes an internal syringe (151a), a guide hole (151b), an exhaust passage (151c), and an exhaust port (151d).

[0053] The internal syringe (151a) has a penetrating shape based on the center of the body (151).

[0054] The guide hole (151b) is located at the branching point where the internal syringe (151a) and the discharge path (151c) communicate, and communicates with the central hole of the heat conduction cap (154).

[0055] The discharge path (151c) is formed on the side of the inner syringe (151a) and is a path for discharging residual epoxy.

[0056] The discharge port (151d) is connected to the discharge path (151c) to discharge the remaining epoxy discharged from the discharge path (151c) to the outside.

[0057] Next, the plunger (152) can move up and down on the internal syringe (151a). This plunger (152) consists of a load portion (152a) and a head portion (152b).

[0058] The load portion (152a) is connected to the actuator (153) and moves up and down on the internal syringe (151a).

[0059] The head portion (152b) is an extension of the upper part of the load portion (152a) and has a width corresponding to the width of the inner syringe (151a). The head portion (152b) moves downward by an appropriate amount of epoxy on the inner syringe (151a), and when the remaining epoxy is discharged through the discharge channel (151c) and the discharge port (151d), it moves back to the initial position so that an appropriate amount of epoxy is placed on the upper part of the heat conduction cap (154).

[0060] The heat conduction cap (154) has a central hole communicating with the guide hole (151b) and covers the top of the body (151) excluding the center, enabling heat transfer. The heat conduction cap (154) has a structure that is detachable from the body (151). This facilitates maintenance, such as cleaning, of the body (151) and the heat conduction cap (154), respectively.

[0061] The heater (155) heats the heat conduction cap (154) to reduce the viscosity of the epoxy placed on the surface of the heat conduction cap (154) and the head portion (152b) of the plunger (152).

[0062] FIGS. 8 to 12 illustrate the process of discharging an appropriate amount of epoxy to be applied to the lower part of the lens, and FIG. 13 illustrates the appearance of epoxy being applied to the lower part of the lens.

[0063] The supply unit (170) supplies a certain amount and / or a specific amount of epoxy (3) to the top of the head portion (152b) of the plunger (152) (Fig. 8).

[0064] In order to secure enough epoxy (3) to fix the lens in an optimal position for each channel, the plunger (152) descends to a set height according to the amount of epoxy (3) discharged from the supply unit (170 in FIG. 8), and the epoxy (3) applied to the head unit (152b) flows into the internal syringe (151a) along the head unit (152b) due to its viscosity (Fig. 9).

[0065] The remaining epoxy (3) at the top inlet of the inner syringe (151a) is sucked in and discharged to the outside along the discharge path (151c) using a vacuum, thereby controlling the discharge so that only the epoxy (3) introduced into the inner syringe (151a) is discharged (Figs. 10, 11).

[0066] The plunger (152) is returned (raised) to its initial position to push the epoxy (3) out of the inner syringe (151a) (Fig. 12).

[0067] Finally, epoxy (3) is applied to the lower part of the lens (12) to be bonded (Fig. 13).

[0068] FIG. 14 illustrates the quantitative application of epoxy per channel through a multi-channel optical module lens position fixing device according to one embodiment of the present invention.

[0069] Even if the thickness (height) of the optical elements (11, 21, 31, 41) mounted on the sub-mount (1) for each channel varies according to the channel, the multi-channel optical module lens position fixing device (100 of FIG. 4) can apply an appropriate amount of epoxy (3) for each channel to ensure lens contamination by epoxy and mechanical strength of the lens joint.

[0070] As a result, when the lenses (12, 22, 32, 42) are bonded with epoxy (3) on the bonding portions (2a, 2b, 2c, 2d) of the sub-mount (1), an appropriate amount of epoxy (3) is applied per channel so that the light efficiency can be prevented even if the gap (D1 to D4) between the lenses (12, 22, 32, 42) and the sub-mount (1) is different.

[0071] Method for fixing the position of a multi-channel optical module lens

[0072] FIG. 15 is a block flowchart illustrating a method for fixing the position of a multi-channel optical module lens according to an embodiment of the present invention.

[0073] A method for fixing the position of a multi-channel optical module lens according to one embodiment of the present invention includes a lens pickup step (S110), a lens optimal position verification step (S120), an appropriate amount of epoxy discharge step at the optimal position (S130), a lens bottom epoxy application step (S140), and an optimal position lens fixing step (S150).

[0074] The lens pickup step (S110) picks up the lens with a gripper in the dark part to determine the optimal position of the lens to be fixed to the sub-mount between the optical element and the optical waveguide.

[0075] The lens optimal position verification step (S120) verifies the point of maximum light intensity (optimal position) where light emitted through the light-emitting part of the optical element passes through the lens and is focused into the optical waveguide. At this time, the step (S120) detects whether there is contact between the lens and the sub-mount through a load sensor, and then calculates the sensing value by comparing it with a reference value to secure the optimal position of the lens where the maximum light intensity is focused according to the result.

[0076] In the step of discharging an appropriate amount of epoxy at an optimal position (S130), once the optimal position of the lens is secured, the control unit supplies a certain amount and / or a specific amount of epoxy from the supply unit, and the discharging unit then discharges an appropriate amount of epoxy suitable for the optimal position of the lens.

[0077] The lens bottom epoxy application step (S140) applies the epoxy ejected from the ejection unit to the bottom of the lens. In this step (S140), the dark part picks up the lens through a gripper.

[0078] The optimal position lens fixing step (S150) involves applying epoxy to the bottom of the lens and then aligning and fixing the lens at a designated position (correct position).

[0079] FIG. 16 illustrates an epoxy dispensing method in a method for fixing the position of a multi-channel optical module lens according to one embodiment of the present invention.

[0080] The epoxy discharge method (S130) includes a plunger head epoxy application step (S131), a plunger lowering step (S132), a residual epoxy discharge step (S133), a step to check for external discharge (S134), and a plunger return to initial position step (S135).

[0081] The plunger head portion epoxy application step (S131) ​​applies the epoxy supplied from the supply unit to the top of the plunger head portion.

[0082] The plunger lowering step (S132) lowers the height of the plunger to a set position according to the amount of epoxy discharged from the supply unit in order to secure enough epoxy for the lens to be fixed in an optimal position for each channel.

[0083] In the residual epoxy discharge step (S133), when the epoxy applied to the head portion flows into the internal syringe (151a) along the head portion due to viscosity, the residual epoxy at the upper inlet of the internal syringe is sucked along the discharge path using a vacuum and discharged to the outside.

[0084] The external discharge verification step (S134) checks whether there is any residue of epoxy on the discharge path.

[0085] The plunger initial position return step (S135) returns (raises) the plunger to its initial position to push the epoxy out of the inner syringe, thereby allowing the epoxy to be applied to the lower portion of the lens to be finally bonded. Although the configuration of the present invention has been described in detail through the above preferred embodiment, this is merely an example, and it is understood that various modifications and changes are possible within the scope permissible of the technical concept of the present invention. Accordingly, the scope of protection of the present invention should be determined by the following claims. Explanation of the symbols

[0086] 1: Sub-mount 2: Bonding part 3: Epoxy 10, 20, 30, 40: Optical module 11, 21, 31, 41: Optical element 11a, 21a, 31a, 41a: Light emitting part 12, 22, 32, 42: Lens 13, 23, 33, 43: Optical waveguide 100: Multi-channel optical module lens position fixing device 110: Arm part 111: Gripper 112: Gripper arm 113: Load sensor 114: Stage 130: Control part 131: Processor 132: Communication device 133: Memory 134: Storage device 135: Input interface device 136: Output interface device 137: Bus 150: Dispensing part 151: Body 151a: Internal syringe 151b: Guide hole 151c: Discharge path 151d: Discharge port 152: Plunger 152a: Load section 152b: Head section 153: Actuator 154: Heat conduction cap 155: Heater 155a: Power cable 170: Supply section

Claims

Claim 1 A multi-channel optical module lens position fixing device having an optical element, a lens, and an optical waveguide located on a sub-mount as a single optical path, comprising: a dark part for picking up the lens; a control part for adjusting the position of the dark part so that the lens is fixed at a preset designated position on the sub-mount; and a discharge part for discharging an amount of epoxy necessary for fixing between the sub-mount and the lens, wherein the gap between the sub-mount and the lens changes according to the position of the light-emitting part of the optical element. Claim 2 A multi-channel optical module lens position fixing device according to claim 1, wherein the arm portion comprises: a gripper that grips or releases the lens according to a separate command; a gripper arm that electrically connects the gripper to the front end; a load sensor mounted on the rear end of the gripper arm to detect contact between the lens and the sub-mount; and a stage that is connected to the rear end of the gripper arm with the load sensor in between and is capable of moving along a preset path. Claim 3 A multi-channel optical module lens position fixing device according to paragraph 2, wherein the load sensor transmits an electrical signal generated by the compressive force of the gripper arm to the control unit when the gripper picks up the lens. Claim 4 A multi-channel optical module lens position fixing device according to claim 1, wherein the discharge portion comprises: a body made of a transparent material having a hollow shape; a plunger capable of moving up and down within the hollow of the body; an actuator for moving the plunger; a heat-conducting cap covering the upper portion excluding the center of the body; and a heater for heating the heat-conducting cap to reduce the viscosity of the epoxy placed on the surface of the heat-conducting cap and the head portion of the plunger. Claim 5 A multi-channel optical module lens position fixing device according to claim 4, wherein the body comprises: an internal syringe formed through the center of the body; a guide hole communicating with the central hole of the heat conduction cap; a discharge passage formed on the side of the internal syringe for discharging residual epoxy; and a discharge port communicating with the discharge passage for discharging residual epoxy discharged from the discharge passage to the outside. Claim 6 A multi-channel optical module lens position fixing device according to claim 5, wherein the guide hole is located at a branching point where the internal syringe and the discharge path communicate. Claim 7 A multi-channel optical module lens position fixing device according to claim 4, wherein the plunger comprises: a rod portion capable of moving up and down within the hollow of the body by means of the actuator; and a head portion extending to the upper end of the rod portion and positioning an appropriate amount of epoxy supplied to the upper end of the main body onto the upper end of the heat-conducting cap. Claim 8 In paragraph 4, the heat conduction cap is a multi-channel optical module lens position fixing device having a structure detachable from the body. Claim 9 A method for fixing the position of a lens in an optical module having an optical element, a lens, and an optical waveguide located on a sub-mount as a single optical path, comprising: a step of picking up a lens to be fixed to the sub-mount between the optical element and the optical waveguide using a gripper of the dark portion; a step of sensing whether there is contact between the lens and the sub-mount through a load sensor based on a preset point of light intensity where light emitted through the light-emitting portion of the optical element passes through the lens and is focused on the optical waveguide, and then comparing the sensed value with a reference value to determine the optimal position of the lens where the light intensity is focused according to the result; a step of discharging a preset amount of epoxy at the optimal position of the lens confirmed; a step of applying the epoxy to the lower portion of the lens; and a step of aligning and fixing the lens with the applied epoxy at a designated position. Claim 10 In claim 9, the step of dispensing the epoxy comprises: applying a preset amount of epoxy supplied from a supply unit to the top of the head portion of a plunger; lowering the height of the plunger to a preset position according to the amount of epoxy applied to the top of the head portion to fix the lens at a preset optimal position for each channel; sucking in the remaining epoxy at the top inlet of the internal syringe and discharging it to the outside when the epoxy applied to the head portion flows into the internal syringe along the head portion due to viscosity; checking for any remaining epoxy on the discharge path; and returning the plunger to an initial position to push the epoxy flowing into the internal syringe to the top of the head portion.

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