JP5497531B2 - Optical device manufacturing method and optical device - Google Patents

Description

  The present invention relates to an optical device manufacturing method and an optical device.

  Conventionally, as a method of manufacturing this type of optical device, an ultraviolet curable adhesive is used for position adjustment between a laser diode (light source) housed and fixed in a sleeve and a collimator lens (lens) housed and fixed in a lens holder. The one used is proposed (for example, Patent Document 1). In the collimating device described in Patent Document 1, a cylindrical sleeve is inserted into the sleeve through hole of the sleeve holder, the laser diode and the lens are opposed to each other, and the sleeve holder is disposed on the upper surface of the lens holder (lens holding member). Is done. After the distance between the laser diode and the lens is adjusted, an ultraviolet curable adhesive is applied to a boundary portion between the outer peripheral surface of the sleeve and the upper surface of the sleeve holder, and the sleeve and the sleeve holder are bonded. Then, after the incident position of the laser beam on the lens is adjusted, an ultraviolet curable adhesive is applied to the boundary portion between the side surface of the sleeve holder and the upper surface of the lens holder, and the sleeve holder and the lens holder are bonded.

JP 2006-072012 A

  However, since the conventional collimating apparatus uses an ultraviolet curable adhesive, the adhesive is not cured in an area where ultraviolet rays are not irradiated (not reachable) such as a contact surface between the sleeve (light source holding member) and the sleeve through-hole. It becomes sufficient, and the application area of the adhesive is limited to an area that can be irradiated with ultraviolet rays, such as a boundary portion between the outer peripheral surface of the sleeve and the upper surface of the sleeve holder. Therefore, when the UV curable adhesive application area cannot be sufficiently secured due to the device structure, etc., the fixed member such as the light source holding member and the lens holding member cannot be firmly bonded and fixed, and the device is used. As a result, there is a risk that the light source and the lens may be misaligned.

  The present invention has been made in view of such problems, and is an optical that can securely fix a fixed member such as a lens holding member to the apparatus main body and reduce the positional deviation between the light source and the lens. An object of the present invention is to provide a device manufacturing method and an optical device.

An optical device manufacturing method of the present invention is a method for manufacturing an optical device comprising a lens holding portion for holding a lens and a holding portion having an insertion hole into which the lens holding portion is inserted.
Applying a thermosetting adhesive to the outer peripheral surface of the lens holding portion around the optical axis of the lens;
Inserting the lens holding portion into the insertion hole such that both end portions of the lens holding portion protrude from both end portions of the insertion hole;
An ultraviolet curable adhesive is applied from the outer peripheral surface at one end portion of the lens holding portion protruding from one end portion of the insertion hole to the outer peripheral surface on the one end portion side of the insertion hole of the holding portion having the insertion hole. Applying step;
After positional adjustment of the lens with respect to the light source, and curing the ultraviolet-curing adhesive is irradiated with ultraviolet,
And a step of curing the thermosetting adhesive by heating the optical device.

According to this method, the ultraviolet curable adhesive applied between one end portion of the lens holding portion and one end portion of the insertion hole is cured to bond and fix one end portion side of the lens holding portion. In the state of being bonded and fixed, the thermosetting adhesive applied to the outer peripheral surface of the lens holding portion is cured and the lens holding portion and the holding portion are bonded and fixed. Therefore, even when the area where the ultraviolet rays are not irradiated is an adhesive application area, the fixed member such as the lens holding portion can be securely bonded to the apparatus main body. In addition, since the entire lens holding unit is bonded and fixed to the main body with the one end side bonded and fixed, the thermosetting adhesive pushed out from the gap between the lens holding unit and the insertion hole to the other end side with the insertion. Even when the agent is cured, the displacement of the lens holding portion (positional displacement between the light source and the lens) can be reduced.

In the manufacturing method of the optical device, the ultraviolet-curable adhesive, from the outer peripheral surface of the one end portion of the lens holding portion, toward the outer peripheral surface at one end of the insertion hole of the holding portion, fillet It is preferable to apply so as to form.

According to this method, since the ultraviolet curable adhesive irradiated with ultraviolet rays forms a fillet shape, the lens holding portion and the holding portion can be securely bonded and fixed.

In the manufacturing method of the optical device, the thermosetting adhesive that protrudes to the other end side of the insertion hole along with the insertion of the lens holding part is protruded from the other end of the insertion hole. It is preferable that it is formed in a fillet shape from the outer peripheral surface of the other end portion of the holding portion to the outer peripheral surface of the holding portion having the insertion hole on the other end portion side of the insertion hole .

According to this method, since the thermosetting adhesive that protrudes to the other end side with the insertion is formed in a fillet shape, the lens holding part and the holding part can be firmly fixed.

  An optical device according to the present invention is manufactured by the above-described optical device manufacturing method.

  According to this configuration, the fixing member such as the lens holding unit is securely bonded and fixed to the apparatus main body, and the lens holding unit is displaced due to the curing of the thermosetting adhesive pushed out by the insertion (the light source and the light source). It is possible to realize an optical device with reduced displacement with respect to the lens.

  According to the present invention, a fixed member such as a lens holding portion can be securely bonded and fixed to the apparatus main body, and is pushed out from the gap between the lens holding portion and the insertion hole to the other end side with the insertion. Even when the cured thermosetting adhesive is cured, it is possible to reduce the displacement of the lens holder (positional displacement between the light source and the lens).

It is a disassembled perspective view of the laser light source apparatus which concerns on embodiment of this invention. It is a perspective view of the assembly state of the laser light source apparatus which concerns on this Embodiment. It is a side view of the assembly state of the laser light source apparatus which concerns on this Embodiment. It is a fragmentary sectional view of the light source unit vicinity of the laser light source apparatus which concerns on this Embodiment. It is a figure for demonstrating the manufacturing method of the laser light source apparatus which concerns on this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The optical device according to the present embodiment is applied as a laser light source device of a laser display system that combines a plurality of laser beams and projects a single light beam onto a screen, for example. Hereinafter, a laser light source device will be described as an example of the optical device.

  FIG. 1 is an exploded perspective view of the laser light source device according to the present embodiment. 2 and 3 are a perspective view and a side view of the assembled laser light source device according to the present embodiment. As shown in FIGS. 1 to 3, the laser light source device 1 includes a base 2 as a base member, a light source unit 3 and a light source irradiation unit 4 attached to the base 2, and a bracket ( (Attachment member) 5, a bracket (attachment member) 6 for fixing the light source irradiation unit 4, an optical axis adjustment unit 7 attached to the bracket 6, and a drive unit 8 for driving the light source irradiation unit 4. In the following, for convenience of explanation, the light source irradiation unit 4 side is referred to as the front side of the laser light source device 1, and the light source unit 3 side is referred to as the rear side of the laser light source device 1.

  The base 2 is formed by, for example, aluminum die casting, and includes a bottom surface portion 201 and a vertical support body 202 erected upward from a rear side end portion of the bottom surface portion 201. A cylindrical portion 203 into which a fixed shaft 405 of the light source irradiation unit 4 to be described later is inserted is provided on the front side of the bottom surface portion 201, and in the vicinity of the cylindrical portion 203 around the cylindrical portion 203 during assembly. A locking piece 204 that locks one end of the wound torsion spring 9 is provided. A motor holding portion 205 that holds a driving motor 801 of the driving unit 8 described later is provided on the rear side of the cylindrical portion 203, and a driving gear 802 of the driving unit 8 can be rotated in the vicinity of the motor holding portion 205. A shaft portion 206 is provided for support. The motor holding part 205 is composed of a pair of front and rear holding pieces 205a, 205b formed in a substantially U shape. Fixing holes 207 for fixing the bracket 6 are provided on both the left and right sides of the motor holding unit 205. Further, a pair of left and right fixing holes 208 for fixing a circuit board 305 of the light source unit 3 to be described later are formed on the rear end surface of the bottom surface portion 201.

  The vertical support 202 is formed of a support base 209 formed in a substantially rectangular plate shape and an annular portion 210 protruding from the rear surface of the support base 209. An insertion hole 211 into which the lens holder 302 of the light source unit 3 is inserted is formed in the center of the support base 209 so as to penetrate in the plate thickness direction. The insertion hole 211 is an opening formed in the annular portion 210. 212 (see FIG. 4). The insertion hole 211 formed in the support base 209 is formed in the annular portion 210 with a diameter that slightly forms a gap with the outer peripheral surface 302 a of the lens holder 302 around the optical axis of the collimating lens 301. The opening 212 is formed with a larger diameter than the diameter of the insertion hole 211. In addition, a pair of attachment holes 213 to which the bracket 5 is attached and a fixing hole 214 for screwing are formed in the upper part of the support base 209. A pair of fixing holes 215 for fixing the laser diode holder 304 of the light source unit 3 are formed in the vicinity of the outer peripheral edge of the opening 212 on the rear surface side of the annular portion 210.

  FIG. 4 is a partial cross-sectional view showing the vicinity of the light source unit 3. As shown in FIG. 4, the light source unit 3 is arranged in the vicinity of the vertical support 202 of the base 2, and holds a lens holder 302 that holds the collimating lens 301 and a laser diode (light source) 303. The laser diode holder 304 is composed of a printed circuit board (hereinafter referred to as “circuit board”) 305.

  The lens holder 302 is formed in a substantially cylindrical shape, and the collimating lens 301 is held inside. A flange 306 used for position adjustment is formed at the front end of the lens holder 302. Although details will be described later, the lens holder 302 is inserted from the rear side into the insertion hole 211 of the support base 209 in a state where a thermosetting adhesive is applied to the outer peripheral surface 302a around the optical axis of the lens. At this time, the front end portion of the lens holder 302 protrudes from the front end portion side of the insertion hole 211, and the rear end portion of the lens holder 302 protrudes from the rear end portion side of the insertion hole 211, thereby opening the annular portion 210. The state enters the space A1 formed in 212 (see FIG. 5). Then, an ultraviolet curable adhesive is applied to a boundary portion between the outer peripheral surface 302 a on the tip end side of the lens holder 302 and the front end portion of the insertion hole 211, and the collar portion 306 is held with a jig to collimate the lens 301 to the laser diode 303. After the position adjustment is performed, ultraviolet rays are irradiated. Then, the laser light source device 1 is heated to cure the thermosetting adhesive, and the lens holder 302 and the vertical support 202 are bonded and fixed.

  The laser diode holder 304 is formed in a substantially plate shape and is made of a metal material having good heat conductivity so as to have a heat dissipation function. A laser beam emission port 307 is formed at the center of the laser diode holder 304, and the laser diode 303 is held so as to protrude from the laser beam emission port 307 to the front side. A pair of through holes 308 for fixing to the vertical support 202 is formed above and below the laser beam exit 307. The laser diode holder 304 is fixed to the vertical support 202 by fixing the screw 309 to the fixing hole 215 of the annular portion 210 through the through hole 308.

  The circuit board 305 functions as a power supply board for supplying power to at least the laser diode 303. Below the circuit board 305, a pair of left and right through holes 310 for fixing to the base 2 are formed. The circuit board 305 is fixed to the base 2 by fixing the screw 311 to the fixing hole 208 of the bottom surface portion 201 through the through hole 310.

  The bracket 5 is formed of, for example, an insulating resin material, and is fixed to the upper surface of the support base 209. The board holding portion 502 holds the upper end of the circuit board 305 behind the fixing portion 501. It is composed of The fixing portion 501 is formed with a through hole 503 for fixing to the fixing hole 214 of the support base 209 and a pair of protruding pieces 504 protruding downward. With the board holding portion 502 holding the upper end of the circuit board 305, the protruding piece 504 is locked to the mounting hole 213 of the support base 209 and the screw 505 is fixed to the fixing hole 214 via the through hole 503. Thus, the bracket 5 is fixed to the base 2.

  The light source irradiation unit 4 includes a rotatable prism 401, a case 402 that holds the lower end of the prism 401, a holding member 403 that covers the prism 401 from above and is attached to the case 402, and a center of the case 402. And a fixed shaft 405 that passes through the formed through-hole 404 and is fixed to the cylindrical portion 203. The holding member 403 is formed, for example, by bending a thin metal plate material, and includes an upper surface portion 403a that holds down the upper surface of the prism 401, and a side surface portion 403b that hangs down from the left and right ends of the upper surface portion 403a. The upper surface portion 403 a is configured to be pressed from the pressing protrusion 604 of the bracket 6, and both side surface portions 403 b are attached to the case 402. The lower surface of the case 402 is provided with a locking portion 406 for locking the other end of the torsion spring 9 and a gear portion (not shown) that meshes with a driving gear of the driving unit 8 described later. In the light source irradiation unit 4, when the driving force from the driving unit 8 is transmitted via the gear portion, the prism 401 is rotated, and the emission direction of the laser light emitted from the light source unit 3 is defined.

  The drive unit 8 includes a drive motor 801 that supplies a drive force for rotating the light source irradiation unit 4 and a drive gear 802 that transmits the drive force from the drive motor 801 to the case 402.

  The drive motor 801 is configured to supply an electric signal to the motor body 803, a drive shaft 804 projecting to the front side of the motor body 803, a flange portion 805 provided on the front side of the motor body 803, and the motor body 803. A flat cable 806. The drive motor 801 is attached to the base 2 in a state where a flange portion 805 is disposed between the holding pieces 205a and 205b and the drive shaft 804 is rotatably held. The drive shaft 804 is formed with a groove portion that meshes with a first gear portion 807 of a drive gear 802 to be described later. The flat cable 806 is pulled out to the rear side, and is connected to a terminal portion provided on the rear surface of a circuit board 305 of the light source unit 3 described later.

  The drive gear 802 includes a first gear portion 807 and a second gear portion 808 having a smaller diameter than the first gear portion 807, and is attached to the base 2 while being inserted through the shaft portion 206. In this case, the drive gear 802 is attached at a position where the first gear portion 807 meshes with the drive shaft 804 and the second gear portion 808 meshes with the gear portion of the case 402. When an electric signal is supplied to the drive motor 801 via the flat cable 806 and the drive shaft 804 rotates, the first gear portion 807 rotates, and the case 402 according to the rotation of the second gear portion 808 rotating accordingly. Rotates and the prism 401 rotates.

  The bracket 6 is formed of, for example, an insulating resin material, and is fixed to the base 2 so as to cover the drive motor 801. The bracket 6 is provided on the rear end side of the accommodating portion 601 that opens downward and accommodates and holds the drive motor 801, the fixing portion 602 that extends laterally from the lower end of the accommodating portion 601, and the accommodating portion 601. And a pressing protrusion 604 protruding downward from the center of the front end of the housing portion 601.

  A pair of pressing pieces 605 that press the flange portion 805 of the drive motor 801 are provided on both side surfaces of the housing portion 601. A screw hole 606 is formed in the fixing portion 602 at a position facing a plurality of fixing holes 207 provided in the base 2. The fixing portion 602 is fixed to the base 2 by fixing the screw 607 to the fixing hole 207 of the base 2 through the screw hole 606. A pair of upper and lower guide portions 608 and 609 are formed on the upper and lower end portions of the rear surface of the wall portion 603 so as to guide an X-axis moving portion 702 of the optical axis adjusting unit 7 described later so as to be slidable in the X-axis direction ( (See FIG. 3).

  The optical axis adjustment unit 7 includes a concave lens 701 that performs optical axis adjustment in the X and Y directions of laser light emitted from the laser diode 303, an X axis moving unit 702 that can move the concave lens 701 in the X axis direction, and X axis movement. A Y-axis moving part 703 that moves integrally with the part 702 and can move the concave lens 701 in the Y-axis direction.

  The X-axis moving part 702 is formed in, for example, a substantially flat plate shape with an insulating resin material, and an opening 704 having a rectangular shape in front view is formed in the center thereof. On the front side of the X-axis moving part 702, a pair of engaging parts 705 that engage with the guide part 608 of the bracket 6 are provided above the opening part 704, and the guide of the bracket 6 is provided below the opening part 704. A pair of engaging portions 706 that engage with the portion 609 are provided. The optical axis adjustment of the laser beam in the X-axis direction can be performed by sliding the X-axis moving unit 702 with the engaging unit 705 engaged with the guide unit 608 and the engaging unit 706 engaged with the guide unit 609. Done. In addition, a pair of left and right guide portions 707 that guide the Y axis moving portion 703 to be slidable in the Y axis direction are formed on the rear surface side of the X axis moving portion 702.

  For example, the Y-axis moving part 703 is formed in an approximately flat plate shape with an insulating resin material, and an opening 708 having a circular shape in front view is formed in the center thereof. The concave lens 701 is held on the rear surface side of the Y-axis moving unit 703 so as to be exposed from the opening 708 to the front surface side. A pair of engaging portions 709 that engage with the pair of guide portions 707 of the X-axis moving portion 702 are provided on both sides of the upper end portion on the front side of the Y-axis moving portion 703. A pair of engaging portions 710 that engage with the pair of guide portions 707 of the X-axis moving portion 702 are provided on both sides of the lower end portion on the front side of the Y-axis moving portion 703. The optical axis adjustment of the laser beam in the Y-axis direction is performed by sliding the Y-axis moving unit 703 with these engaging portions 709 and 710 engaged with the guide portion 707.

  Next, an example of a manufacturing method of the laser light source device 1 having the above configuration will be described. FIG. 5 is a schematic cross-sectional view for explaining an example of the manufacturing method of the laser light source device 1 according to the present embodiment. FIG. 5 shows from the insertion of the lens holder 302 to the insertion hole 211 of the support base 209 to the adhesive fixing.

  When the laser light source device 1 is manufactured, first, the thermosetting adhesive B1 is applied to the entire outer peripheral surface 302a of the lens holder 302 (FIG. 5A), and the lens holder 302 is supported from the rear side of the annular portion 210. Insert into the insertion hole 211 of the base 209. The front end portion of the lens holder 302 protrudes from the front end portion side of the insertion hole 211, and the rear end portion of the lens holder 302 protrudes from the rear end portion side of the insertion hole 211 and is formed in the opening 212 of the annular portion 210. The lens holder 302 is inserted until it enters the space A1 (FIG. 5B). At this time, with the insertion of the lens holder 302, the thermosetting adhesive B1 is pushed out from the gap between the outer peripheral surface 302a of the lens holder 302 and the inner peripheral surface of the insertion hole 211 in the direction opposite to the insertion direction. The space A1 formed in 212 is pushed out. Since the rear end portion of the lens holder 302 protrudes to the space A1 formed in the opening 212, the extruded thermosetting adhesive B1 is formed between the outer peripheral surface 302a of the protruding lens holder 302 and the insertion hole 211. It is formed in a fillet shape at a boundary portion with the outer peripheral surface 211a on the rear end side (portion surrounded by a dotted line in FIG. 5B).

  Next, the laser diode holder 304 holding the laser diode 303 is screwed and fixed to the rear surface of the annular portion 210 with the lens holder 302 inserted into the insertion hole 211, and the circuit board 305 is screwed to the bottom surface portion 201. Fix it. Then, the bracket 5 is fixed to the upper surface of the support base 209 while holding the upper end of the circuit board 305.

  Next, the ultraviolet curable adhesive B <b> 2 is formed so as to form a fillet shape at the boundary portion between the outer peripheral surface 302 a of the lens holder 302 protruding from the front end portion of the insertion hole 211 and the outer peripheral surface 211 a on the front end side of the insertion hole 211. And the collar 306 is held by the jig 10 to adjust the position of the collimating lens 301 relative to the laser diode 303 (FIG. 5C). After adjusting the position of the collimating lens 301 with respect to the laser diode 303, the area to which the ultraviolet curable adhesive B2 is applied is irradiated with ultraviolet rays. As a result, the ultraviolet curable adhesive B2 irradiated with ultraviolet rays is cured, and the front end side of the lens holder 302 is bonded and fixed to the support base 209 in a state where the collimating lens 301 is positioned with respect to the laser diode 303. Then, the laser light source device 1 is heated to cure the thermosetting adhesive B1, and the lens holder 302 and the support base 209 are bonded and fixed. At this time, since the tip end side of the lens holder 302 is bonded and fixed with the ultraviolet curable adhesive B2, there is no displacement in the insertion direction side with the curing of the thermosetting adhesive B1. The thermosetting adhesive B1 formed in a fillet shape at the boundary portion between the outer peripheral surface 302a on the rear end side and the outer peripheral surface 211a on the rear end side of the insertion hole 211 firmly bonds the lens holder 302 and the support base 209. Adhering and fixing to (a part surrounded by a dotted line in FIG. 5C).

  Next, the drive motor 801 is disposed on the motor holding portion 205 of the base 2 in a state where the flange portion 805 is disposed between the holding pieces 205a and 205b and the drive shaft 804 is rotatably held, and the motor main body 803. The flat cable 806 connected to is connected to the terminal portion of the circuit board 305. Then, the drive gear 802 is attached to the shaft portion 206 so that the first gear portion 807 meshes with the drive shaft 804. Next, the torsion spring 9 is disposed around the cylindrical portion 203 of the base 2, and the light source irradiation unit 4 is attached so that the fixed shaft 405 is inserted into the cylindrical portion 203 from above. Next, the bracket 6 to which the optical axis adjustment unit 7 is attached is attached to the base 2 so that the drive motor 801 is accommodated in the accommodation portion 601 from above the laser light source device 1. Then, the X-axis moving unit 702 and the Y-axis moving unit 703 of the optical axis adjusting unit 7 are slid to adjust the position of the concave lens 701, and the light source irradiation unit 4 is rotated by the drive unit 8 to rotate the light source irradiation unit 4. Adjust the angle.

  In the laser light source device 1 assembled in this way, the laser light from the laser diode 303 held by the laser diode holder 304 of the light source unit 3 is emitted from the laser light emission port 307 and held by the lens holder 302. After passing through the collimator lens 301, it passes through the concave lens 701 of the optical axis adjustment unit 7, proceeds in the direction defined by the prism 401 of the light source irradiation unit 4, and is guided to the display screen of the laser display system, for example. .

  In the above description, the case where the light source irradiation unit 4 and the drive unit 8 are fixed after the light source unit 3 is fixed to the vertical support 202 has been described as an example. However, the laser light source device 1 according to the present invention is manufactured. The method is not limited to this manufacturing order, and the manufacturing order may be changed depending on the apparatus configuration or the like as long as the manufacturing order from the position adjustment of the light source unit 3 to the adhesive fixing is not changed. For example, members other than the light source unit 3 such as the light source irradiation unit 4 may be fixed first, and then the light source unit 3 may be fixed.

  As described above, according to the present embodiment, the one end portion of the lens holder 302 is cured by curing the ultraviolet curable adhesive B2 applied to the boundary portion between the one end portion of the lens holder 302 and the one end portion of the insertion hole 211. With the one side bonded and fixed, the thermosetting adhesive B1 applied to the outer peripheral surface 302a of the lens holder 302 is cured and the lens holder 302 and the support base 209 are bonded and fixed. . Therefore, even when the area where the ultraviolet rays are not irradiated is an adhesive application area, the fixed member such as the lens holder 302 can be reliably bonded and fixed to the apparatus main body. In particular, when the entire apparatus is downsized, it is effective because it is difficult to secure a sufficient area that can be irradiated with ultraviolet rays. Further, since the entire lens holder 302 is bonded and fixed to the apparatus main body with the lens holder 302 and one end of the support base 209 bonded and fixed (temporarily fixed), the outer periphery of the lens holder 302 is inserted as the lens holder 302 is inserted. Even when the thermosetting adhesive B1 pushed out from the gap between the surface 302a, the insertion hole 211, and the inner peripheral surface is cured, the displacement of the lens holder 302 (the displacement between the light source and the lens) is reduced. be able to. Further, since the ultraviolet curable adhesive B2 irradiated with ultraviolet rays is applied so as to form a fillet shape, the lens holder 302 and the one end side of the support base 209 can be securely fixed (temporarily fixed). The thermosetting adhesive B1 that protrudes to the other end side with insertion is also formed in a fillet shape, so that the boundary portion between the other end portion of the lens holder 302 and the other end portion of the insertion hole 211 is strengthened. Can be fixed.

  In addition, this invention is not limited to the said embodiment, It can change and implement variously. In the above-described embodiment, the size, shape, and the like illustrated in the accompanying drawings are not limited to this, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

1 Laser light source device (optical device)
2 base 201 bottom face part 202 vertical support body (holding part)
209 Support base 210 Annular portion 211 Insertion hole 211a Outer peripheral surface 212 Opening 3 Light source unit 301 Collimating lens (lens)
302 Lens holder (lens holder)
302a outer peripheral surface 303 laser diode (light source)
304 Laser diode holder (light source holder)
306 Hook 10 Jig B1 Thermosetting adhesive B2 Ultraviolet curing adhesive

Claims (4)

A method of manufacturing an optical device comprising a lens holding part for holding a lens and a holding part having an insertion hole into which the lens holding part is inserted,
Applying a thermosetting adhesive to the outer peripheral surface of the lens holding portion around the optical axis of the lens;
Inserting the lens holding portion into the insertion hole such that both end portions of the lens holding portion protrude from both end portions of the insertion hole;
An ultraviolet curable adhesive is applied from the outer peripheral surface at one end portion of the lens holding portion protruding from one end portion of the insertion hole to the outer peripheral surface on the one end portion side of the insertion hole of the holding portion having the insertion hole. Applying step;
After positional adjustment of the lens with respect to the light source, and curing the ultraviolet-curing adhesive is irradiated with ultraviolet,
And a step of curing the thermosetting adhesive by heating the optical device. The ultraviolet-curable adhesive, from the outer peripheral surface of the one end portion of the lens holding portion, toward the outer peripheral surface at one end of the insertion hole of the holding portion, is applied to form a fillet shape The method of manufacturing an optical device according to claim 1. The outer peripheral surface of the other end portion of the lens holding portion that protrudes from the other end portion of the insertion hole is the thermosetting adhesive that protrudes from the other end portion of the insertion hole as the lens holding portion is inserted. from the manufacture of the optical device according to the outer edge surface of the other end side of the insertion hole of the holding portion having the insertion hole, to claim 1 or claim 2, characterized in that it is formed in the fillet Method.   An optical device manufactured by the method for manufacturing an optical device according to any one of claims 1 to 3.

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