JP4596808B2 - Laser joining method and apparatus for optical component unit - Google Patents

Description

  The present invention relates to a laser joining method and apparatus for an optical component unit for fixing an optical component accommodated along an inner wall of an accommodating component formed of resin to the inner wall.

  As a conventional method for fixing an optical component to a thermoplastic resin housing component, a mechanism for housing the optical component of the housing component is provided with a tightening margin, this housing component is fixed to a jig, and an anvil is added. There is a fixing method using a thermal constriction in which an optical component is fixed to a housing component by deforming the constriction margin with heat and pressure. Or the fixing method which adhere | attaches an optical component to an accommodation component using an ultraviolet curable adhesive agent is known.

In general, a fixing method using thermal constriction is employed when accuracy is not so necessary, and a fixing method using an ultraviolet curable adhesive is often employed when accuracy is required.
By the way, conventionally, it has been considered that joining of glass and resin by a laser welding method is very difficult. However, for example, as described in Patent Document 1, it has recently become possible to bond glass and resin using a laser. In this method, the resin is locally melted by a laser to form a viscous flow state, and the resin is pushed between the optical component and the resin housing component.
Japanese Patent Application No. 2003-130688

  In the fixing method using the thermal constriction described above, a dedicated anvil and receiving jig are required for each model for the optical component and the housing component, and the anvil and the receiving jig are remade according to the model change, and Position adjustment is required.

  For this reason, since it takes a long time to start up by switching the model to be manufactured in the conventional technology, accuracy of micron order is required for fixing the optical component and the housing component, and there are many types of optical components and the housing component. When the model switching cycle is short in the manufacturing process, there is a problem that productivity is lowered.

  On the other hand, in the fixing method using the ultraviolet curable adhesive described above, the position of the optical component is adjusted in a state where the adhesive is weakly irradiated with ultraviolet rays, and then the ultraviolet rays are irradiated until the adhesive is cured. Since it takes about 10 seconds at the earliest to cure, the tact is reduced, and in the case of mass production from the beginning of production, there is a problem that causes the productivity to be lowered.

  In addition, for example, when a plurality of lenses are fixed to an integrated storage component such as a camera lens, an adhesive enters between the lens and the receiving surface in the optical axis direction, so that the lens is displaced in the optical axis direction. Depending on the distance, the distance between the lenses may change and cause a defect.

  Furthermore, in the case of an optical component unit that requires a certain degree of resistance to the optical component, there is a problem that sufficient resistance to disconnection cannot be obtained if an adhesive can be applied only to the side surface of the optical component.

  In the conventional laser welding method, the reason why it has been considered that the bonding of glass and resin is very difficult is as follows. In laser welding, it is a major premise that bonding between atoms and chemical bonding is possible. When bonding metals, bonding between atoms affects bonding strength, and when bonding resins. In many cases, chemical bonding affects the bonding strength.

  However, when glass and resin are joined, they can be joined only by physical bonds such as the anchor effect, so the bond strength is about two orders of magnitude compared to bonds between atoms and chemical bonds. Get smaller. Therefore, when joining glass and resin, it is necessary to enlarge a joining area. In order to increase the bonding area, it is necessary to fill the resin as much as possible where it can be a bonding portion between the resin and the glass. However, since the resin in a viscous flow state is poor in properties such as moving by capillary action, the resin cannot be sufficiently filled in a place where the resin and glass can be joined.

  For this reason, in the conventional method of fixing an optical component to a resin housing component using a laser, the resin constituting the inner wall is locally melted into a viscous fluid state, and the gravity of the heat-melted resin is reduced. The resin is pushed into the gap between the optical component and the inner wall by the action.

  This method is shown in FIG. In the optical component fixing device 100, the housing component 5 is fixed to the holding member 9, and the convex lens 8 is fitted into the inner wall 6 of the housing component 5. Next, the laser 11 is emitted from the laser light source 3. The laser 11 emitted from the laser light source 3 passes through the condensing optical system 2 driven by the condensing optical system driving device 10 and is applied to the inner wall 6 of the housing component 5.

  As shown in FIG. 6, the inner wall 6 of the housing component 5 irradiated with the laser 11 is heated by the irradiated laser 11. Next, the heated inner wall 6 softens and dissolves and starts to decompose locally. Due to the reaction force 12 generated at the time of decomposition, a force in the direction of gravity is applied to the resin in a viscous flow state on the inner wall 6 of the housing component 5. For this reason, the resin 16 in the viscous flow state on the inner wall 6 is pushed into the gap between the convex lens 8 and the inner wall 6 of the housing component 5. As a result, the convex lens 8 is fixed to the housing component 5.

  In this operation, the nitrogen gas 18 ejected from the nozzle unit 13 is caused to flow vertically downward from the upper position of the central portion of the convex lens 8, thereby preventing the resin from flowing into the peripheral portion of the convex lens 8 and at the same time of the convex lens 8. Fixing is performed while preventing gas and dust generated by decomposition of the resin from adhering to the surface.

  When the laser irradiation device 1 is rotated by the irradiation position moving device 4, the entire periphery of the convex lens 8 is fixed in a few seconds. On the inner wall 6 of the housing component 5, a laser irradiation mark of the laser 11 irradiated to the inner wall 6 is formed.

  However, as shown in FIG. 6, when nitrogen gas 18 is blown onto the upper surface of the central portion of the convex lens 8 that is an optical component, nitrogen gas 17 flows from the central portion of the optical component surface toward the end of the entire circumference, and then the inner wall 6. The nitrogen gas 17 becomes an upward airflow along the line. Therefore, the melted resin at the upper part of the inner wall 6 is lifted up, causing the upper surface to rise, and interfering with other parts that are undesirable in appearance.

  In addition, in order to secure a nitrogen gas flow rate that prevents the flow of resin in the irradiated part, a very large amount of nitrogen flow rate is required as a whole, which increases the cost and requires a long time until the nitrogen flow rate is stabilized, Productivity decreases.

  Furthermore, since the distance from the center to the end of the convex lens 8 that is an optical component differs depending on the model, it is necessary to optimize the entire flow rate according to the model in order to make the nitrogen gas flow rate constant in the laser irradiation unit. For this reason, a problem arises in that productivity is reduced because the startup time at the time of model switching becomes longer.

  An object of the present invention is to provide a laser joining method and apparatus for an optical component unit that does not swell an inner wall, has a low production cost, and can shorten the start-up time when switching models.

A laser joining method for an optical component unit according to the present invention is a laser joining method for fixing an optical component having an optical axis to an inner wall of a resin housing component, and irradiating the inner wall with a laser so as to attach an inner wall of a laser irradiation unit. A laser irradiation step for achieving a viscous flow state, a gas injection step for injecting gas radially from the gas injection means disposed on the optical axis of the optical component to the laser irradiation portion, and fixing the optical component to the inner wall And a fixing step.

A laser joining device for an optical component unit according to the present invention is a laser joining device for fixing an optical component having an optical axis to an inner wall of a resin housing component, a holding member for holding the housing component, and a laser for the inner wall. It comprises: laser irradiation means for irradiating a laser to the irradiation section; and gas injection means that is disposed on the optical axis of the optical component and has an oblique gas injection port facing the laser irradiation section. .

  As described above, according to the present invention, since the gas blown directly to the laser irradiation part flows from the upper part of the inner wall toward the lower part, the upward flow of the resin melted in the viscous flow state is suppressed, The resin does not lift up to the upper part of the inner wall, and there is no rise of the upper surface that causes a defect that interferes with other parts, resulting in low cost and improved productivity.

In addition, the gas pushes the resin flowing into the surface of the optical component toward the inner wall to prevent the decomposed resin, dust, and the like from adhering to the surface, reducing defects, reducing costs, and improving productivity.
In addition, when the distance from the center to the end of the optical component varies depending on the model, it is possible to change the model only by preparing multiple types of nozzle units so that the distance from the inner wall to the nozzle unit injection port is the same. Productivity can be improved by shortening the startup time.

  A laser joining method for an optical component unit according to the present embodiment is a laser joining method for an optical component unit in which an optical component to be accommodated along an inner wall of an accommodation component formed of resin is fixed to the inner wall. A laser irradiation step of irradiating the inner wall with a laser by means to make the resin of the laser irradiation portion into a viscous flow state by local thermal melting, and forcing the resin in the viscous flow state between the optical component and the inner wall; Then, the gas jetting means directly blows a gas which is jetted radially from the upper position corresponding to the central portion of the optical component to the laser irradiation section.

  According to this configuration, since the gas blown directly to the laser irradiation part flows from the upper part of the inner wall toward the lower part, the upward flow of the molten resin in the viscous flow state is suppressed, and the molten resin is The upper surface is not lifted to the upper side, and there is no upper surface rise that causes a defect that interferes with other components, which is preferable in appearance.

In addition, since only a necessary amount of gas is blown to the laser irradiation unit, it is possible to fix the optical component at a low cost, and it is possible to shorten the time until the gas flow rate is stabilized, thereby improving productivity.
In addition, even when the distance from the center to the end of the optical component varies depending on the model, it is only necessary to prepare gas injection means with the same distance from the inner wall to the injection port. Shorter and more productive.

The gas injected by the gas injection means is preferably an inert gas in order to prevent a high-temperature resin and oxygen in the air from reacting during laser irradiation.
The gas injected by the gas injection means is preferably air from the viewpoint of cost.

The optical component is preferably a lens made of glass.
The lens is preferably a convex lens.
It is preferable that the housing component has a cylindrical shape or a shape that omits a part of the cylindrical shape.

  An optical component laser bonding apparatus according to the present embodiment is an optical component laser bonding apparatus that fixes an optical component to be accommodated along an inner wall of an accommodation component formed of resin to the inner wall. A holding member that holds the housed housing component, and a laser beam is irradiated on the inner wall to make the resin in the laser irradiation section into a viscous flow state by local thermal melting, and the resin in the viscous flow state is made into the optical component and the inner wall. And a gas injection means for directly blowing a gas radially ejected obliquely downward from a nozzle unit disposed at an upper position corresponding to the central portion of the optical component. It comprises.

  According to this configuration, since the gas flows from the upper part of the inner wall, the molten resin on the upper part of the inner wall is not lifted, so that the upper surface is not raised and the upper surface causes a defect that interferes with other parts. There is no excitement, which is preferable in appearance.

In addition, since only a necessary amount of gas is blown to the laser irradiation unit, it is possible to fix the optical component at a low cost, and it is possible to shorten the time until the gas flow rate is stabilized, thereby improving productivity.
In addition, even when the distance from the center to the end of the optical component varies depending on the model, it is only necessary to prepare gas injection means with the same distance from the inner wall to the injection port. Shorter and more productive.

  The laser irradiation means preferably includes a laser light source provided for emitting a laser and a condensing optical system for condensing the laser emitted from the laser light source onto an inner wall of a housing component.

The condensing optical system is preferably an aspheric lens.
The condensing optical system preferably includes two convex lenses facing the mask.
Moreover, it is preferable that the laser bonding apparatus for optical components includes an irradiation position moving apparatus that moves the laser irradiation means in order to change the position of the inner wall to be irradiated with the laser.

The irradiation position moving device preferably rotates and moves the laser irradiation means along the circumferential direction of the inner wall of the housing component.
It is preferable that at least two laser irradiation means are provided.

The gas injection means preferably has a ring-shaped injection port directed to the laser irradiation unit in the nozzle unit.
It is preferable that the gas injection unit has a mechanism in which the nozzle unit has the same number of gas injection ports directed to the laser irradiation unit as the laser irradiation unit and the nozzle unit rotates simultaneously with the laser irradiation unit.

  The optical component unit according to the present embodiment is an optical component unit including a housing component formed of resin and an optical component housed along an inner wall of the housing component, and the optical component unit The height up to the top end of the inner wall is 1 mm or less, and the inner wall of the housing component has a laser irradiation mark, and the laser irradiation mark is a resin in which the inner wall is locally melted and made into a viscous flow state. It is pressed between the inner wall and the bulge from the inner wall is 0.1 mm or less.

  With this configuration, the flow of the heat-melted resin in the peripheral portion of the optical component surface is small, and it has a high pulling strength in fixing an optical component that requires fixing accuracy. Further, since there is no upper surface rise due to the rise of the molten resin at the upper part of the inner wall, there is no cause of a defect that interferes with other parts.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic diagram showing a configuration of an optical component fixing device 100 that constitutes a laser bonding apparatus for an optical component unit according to the first embodiment. The optical component fixing device 100 includes a holding member 9 that holds the housing component 5 in which the convex lens 8 is housed. The housing component 5 has a cylindrical shape with an inner wall 6 formed, and is made of a material obtained by mixing carbon black into polycarbonate. The convex lens 8 is held along the inner wall 6 formed in the housing component 5.

  The optical component fixing device 100 is provided with a laser irradiation device 1, and the laser irradiation device 1 has a laser light source 3. The laser light source 3 irradiates a laser 11 having a wavelength of 810 mm that can cause the resin constituting the inner wall 6 formed in the housing component 5 to be in a viscous flow state and to be locally decomposed.

  The laser irradiation apparatus 1 is provided with a condensing optical system 2. The condensing optical system 2 converts the laser 11 emitted from the laser light source 3 into a laser line beam having a beam width of 50 μm on the inner wall 6 of the housing component 5. One aspheric lens is small and lightweight. Therefore, it is preferable. As long as the condensing optical system 2 can collect light with a beam width of 300 μm or less, there is no problem even if a plurality of convex lenses, concave lenses, or aspherical lenses are combined.

  The optical component fixing device 100 includes a condensing optical system driving device 10, and the condensing optical system driving device 10 sets the position of the condensing optical system 2 and the angle of the condensing optical system 2 by increasing the angle with the xyz direction. The tilt is adjusted.

  The optical component fixing device 100 is provided with an irradiation position moving device 4. The irradiation position moving device 4 is configured so that the laser 11 irradiated from the laser irradiation light source 3 is irradiated to the entire periphery of the convex lens 8. The position of the inner wall is changed, and the laser irradiation device 1 is rotated around the optical axis of the convex lens 8 along the circumferential direction of the inner wall of the housing component.

  The optical component fixing device 100 includes gas injection means (not shown), and has a nozzle unit 50 that forms part of the gas injection means. Any gas injection means may be applied as long as it has a mechanism for supplying gas to the nozzle unit 50, and detailed description thereof is omitted.

  The nozzle unit 50 is disposed at an upper position on the center line of the convex lens 8 so as not to interfere with the laser 11, and has a ring-shaped injection port 51 directed to the laser irradiation portion of the inner wall 6, and obliquely downward from the injection port 51. A function of spraying nitrogen gas radially at a total flow rate of 50 (l / min) and blowing the nitrogen gas directly onto the inner wall 5 irradiated with the laser is achieved.

  The operation of the optical component fixing device 100 having the above-described configuration will be described below. FIG. 2 is a cross-sectional view for explaining a method of fixing the convex lens 8 to the inner wall 6 of the housing component 5 by the optical component fixing device 100 according to the first embodiment.

  First, the housing component 5 is fixed to the holding member 9. Then, the convex lens 8 is fitted into the inner wall 6 of the housing component 5. Next, the laser 11 is emitted from the laser light source 3 by the laser irradiation device 1, and the inner wall 6 of the housing component 5 is irradiated with the laser 11 transmitted through the condensing optical system 2. The nozzle unit 50 blows nitrogen gas directly onto the inner wall 5 irradiated with the laser 11 at a total flow rate of 50 (1 / min).

  As shown in FIG. 2, the laser irradiation portion of the inner wall 6 of the housing component 5 is heated and softened and melted by the irradiated laser 11. At this time, softening / dissolution occurs in a portion wider than the width irradiated with the laser 11 by heat conduction.

  Then, the softened / dissolved inner wall 6 starts to be locally decomposed. Due to the reaction force 12 generated at the time of decomposition, a force in the direction of gravity is applied to the resin in a viscous flow state on the inner wall 6 of the housing component 5. For this reason, the resin in the viscous flow state on the inner wall 6 is pushed into a gap of several tens of micrometers (μm) between the convex lens 8 and the inner wall 6 of the housing component 5. As a result, the convex lens 8 is fixed to the housing component 5.

  At this time, the nitrogen gas 17 ejected from the nozzle unit 50 is blown directly onto the laser irradiation part, and the nitrogen gas 17 is caused to flow from the upper part to the lower part of the inner wall 6, so that the resin in the viscous flow state moves upward from the inner wall 6. By suppressing the flow, the resin is efficiently pushed into the gap between the convex lens 8 and the inner wall 6 of the housing component 5. For this reason, the melted resin is not lifted to the upper portion of the inner wall 6, and there is no upper surface rise that causes a defect that interferes with other components, resulting in low cost and improved productivity.

  On the surface of the convex lens 8, there is a slight amount of resin 16 that flows into the periphery of the surface of the convex lens 8 without being pushed into the gap between the convex lens 8 and the inner wall 6 of the housing component 5. If the resin in this viscous flow state flows into the effective diameter of the convex lens 8, it becomes defective.

  However, the resin 16 flowing into the surface of the convex lens 8 also prevents the nitrogen gas 17 sprayed from the nozzle unit 50 from being pushed toward the inner wall 6 and reaching the effective diameter of the convex lens 8. Further, the nitrogen gas 17 prevents the decomposed resin or dust from adhering to the surface of the convex lens 8. Therefore, defects are reduced, cost is low, and productivity is improved.

  When the irradiation position moving device 4 rotates and moves the laser irradiation device 1, the position of the inner wall 6 where the laser 11 hits moves, and the laser 11 irradiated from the laser irradiation light source 3 is irradiated to the entire periphery of the convex lens 8, Fixing is performed in a few seconds over the entire periphery of the convex lens 8. As a result, a laser irradiation mark by the laser 11 is formed on the inner wall 6 of the housing component 5.

  If the distance from the central part to the end of the convex lens 8 that is an optical component varies depending on the model, it is only necessary to prepare a plurality of types of nozzle units 50 so that the distance from the inner wall 6 to the injection port 51 is the same. Productivity can be improved by shortening the startup time of switching.

In this embodiment, nitrogen gas is used as the inert gas, but the same effect can be obtained by using other inert gas such as argon gas.
(Embodiment 2)
This embodiment is the same as the first embodiment except that the gas injected from the nozzle unit 51 is air. In this case, oxygen present in the air may react with the softened / dissolved resin, but the temperature does not rise until the resin decomposes, or it is immediately cooled by the blowing gas even if the decomposition temperature is exceeded. Therefore, the resin hardly reacts with oxygen.

Compared with nitrogen gas, air does not require material costs, and work such as replacement of gas cylinders is unnecessary, so productivity is improved.
(Embodiment 3)
FIG. 3 is a schematic diagram showing a configuration of an optical component fixing device 100 according to another embodiment of the present invention. The same components as those of the optical component fixing device 100 described in FIG. 1 are denoted by the same reference numerals, and detailed description of these components is omitted.

  In FIG. 3, the housing component 5 has a shape without a part of the cylindrical shape forming the inner wall 6. For example, when viewed from above, the inner wall 6 is formed by distributing 3 parts around the convex lens 8. A gap is formed between the inner wall 6 and the inner wall 6.

  The optical component fixing device 100 includes a chuck mechanism (not shown). The chuck mechanism has gripping means such as a claw that operates in a gap between the inner wall 6 and the inner wall 6 that are equally distributed in the housing component 5, and has a convex lens. 8 is configured to adjust the position of the convex lens 8 relative to the housing component 5 with an accuracy of the order of several μm or less. Any chuck mechanism can be applied as long as it has a mechanism for gripping the convex lens 8, and a detailed description thereof will be omitted.

  Three laser irradiation apparatuses 1 each having a laser light source 3 are arranged at an equal distribution of 120 °, and the irradiation position moving apparatus 4 has a laser 11 irradiated from each laser irradiation apparatus 1 2/3 around the convex lens 8. That is, the laser irradiation devices 1 are simultaneously rotated so as to irradiate only the inner wall 6 that is equally distributed.

  The nozzle unit 50 has the same number of gas injection ports 52 directed to the laser irradiation section as the laser irradiation apparatus 1, and the air 18 is totally applied to the inner wall 6 irradiated with the laser 11 while rotating simultaneously with the laser irradiation apparatus 1. Spray directly at a flow rate of 40 (1 / min). The mechanism for rotating the nozzle unit 50 may be realized by mechanically connecting the laser irradiation device 1 and the nozzle unit 50, or may be realized by an electric synchronization means using a motor or the like. The detailed explanation is omitted.

  The operation of the optical component fixing device 100 configured as described above will be described. First, the housing component 5 is fixed to the holding member 9. Then, the convex lens 8 is fitted into the inner wall 6 of the housing component 5. Next, each laser irradiation device 1 is irradiated by the irradiation position moving device 4 while irradiating the inner wall 6 of the housing component 5 with the laser 11 emitted from each laser light source 3 of each laser irradiation device 1 and transmitted through the condensing optical system 2. Is rotated by 120 °, 2/3 around the convex lens 8 is fixed to the inner wall 6 equally distributed in several seconds.

  During this time, the nozzle unit 50 rotates simultaneously with the laser irradiation apparatus 1 and blows air 18 directly from the gas injection port 52 toward the laser irradiation unit at a total flow rate of 40 (1 / min), which is the same as in the previous embodiment. In addition, it prevents the resin in the viscous flow state from flowing upwards of the inner wall 6, prevents the molten resin from lifting up to the upper part of the inner wall 6, and causes the top surface to rise, causing a defect that interferes with other parts. Can be eliminated and productivity can be improved. Further, the resin 16 flowing into the surface of the convex lens 8 is also prevented from being pushed in the direction of the inner wall 6 by the air 18 blown from the nozzle unit 50 and reaching the effective diameter of the convex lens 8, and decomposed resin, dust, etc. The adhesion to the surface of the convex lens 8 is prevented.

  Also in this embodiment, when the distance from the center portion to the end of the convex lens 8 differs depending on the model, the model can be obtained only by preparing various nozzle units 50 having the same distance from the inner wall 6 to the injection port 52. Productivity can be improved by shortening the startup time of switching.

In the present embodiment, air is used as the gas to be blown, but the same effect can be obtained by using other inert gas such as nitrogen or argon gas.
(Embodiment 4)
As shown in FIG. 4, the laser 11 irradiated from the laser light source 3 is condensed by the condensing optical system 2 including two sets of convex lenses, and the condensed laser 11 having a beam width of 300 μm is collected on the inner wall 6 of the housing component 5. It is also possible to irradiate. In this case, the other configuration is the same as that of the third embodiment.

  In order to make the beam width smaller, a mask 14 may be installed behind the condensing optical system 2.

  As described above, according to the present invention, since the molten resin does not reach the effective diameter, defects are reduced, the cost is low, the productivity is improved, and the molten resin at the upper part of the inner wall is not lifted, so that the upper surface is raised. Since there is no failure that interferes with other parts, the cost is low and the productivity is improved, and the startup time when switching models is shortened and the productivity is improved. It can be used for a laser bonding apparatus and an optical component unit of an optical component unit.

(A) is a schematic diagram which shows the structure of the optical component fixing device which concerns on Embodiment 1 of this invention, (b) is an AA arrow directional view. Sectional drawing for demonstrating the method to fix an optical component to the inner wall of an accommodation component with the optical component fixing device which concerns on the same Embodiment 1. FIG. (A) is a schematic diagram which shows the structure of the optical component fixing device which concerns on Embodiment 3 of this invention, (b) is an AA arrow directional view. (A) is a schematic diagram which shows the structure of the optical component fixing device which concerns on Embodiment 4 of this invention, (b) is an AA arrow directional view. (A) is a schematic diagram which shows the structure of the conventional optical component fixing device, (b) is an AA arrow line view. Sectional drawing for demonstrating the method to fix an optical component to the inner wall of an accommodation component with the conventional optical component fixing device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laser irradiation apparatus 2 Condensing optical system 3 Laser light source 4 Irradiation position moving apparatus 5 Housing component 6 Inner wall 7 Resin 8 Convex lens 9 Holding member 10 Condensing optical system drive apparatus 11 Laser 12 Reaction force 14 Mask 16 Flowing resin 17 Nitrogen Gas 18 Air 50 Nozzle units 51 and 52 Injection port 100 Optical component fixing device

Claims (9)

A laser joining method for fixing an optical component having an optical axis to an inner wall of a resin housing component , wherein a laser irradiation step of irradiating the inner wall with a laser to bring the inner wall of a laser irradiation section into a viscous flow state; and the optical component Including a gas injection step of radially injecting gas from the gas injection means disposed on the optical axis of the laser irradiation unit and a fixing step of fixing the optical component to the inner wall. Laser bonding method for component units.   2. The laser joining method for an optical component unit according to claim 1, wherein the gas injected in the gas injection step is an inert gas.   The laser joining method for an optical component unit according to claim 1, wherein the gas injected in the gas injection step is air.   The optical component unit laser joining method according to any one of claims 1 to 3, wherein the optical component is a convex lens. A laser joining apparatus for fixing an optical component having an optical axis to an inner wall of a resin housing component, a holding member for holding the housing component, a laser irradiation means for irradiating a laser on a laser irradiation portion of the inner wall, and A laser bonding apparatus for an optical component unit, comprising: a gas injection unit disposed on an optical axis of the optical component and having an oblique gas injection port facing the laser irradiation unit.   6. The laser joining device for an optical component unit according to claim 5, wherein the laser irradiation means includes two convex lenses facing the mask.   The laser joining apparatus for an optical component unit according to claim 5 or 6, further comprising an irradiation position moving device for rotating the laser irradiation means along the circumferential direction of the inner wall of the housing component.   The laser joining apparatus for an optical component unit according to any one of claims 5 to 7, further comprising at least two laser irradiation means.   9. The optical component unit according to claim 5, wherein the gas injection unit has the same number of gas injection ports as the laser irradiation unit and forms a mechanism that rotates simultaneously with the laser irradiation unit. Laser bonding equipment.

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