JP6669213B2 - Light source unit, optical scanning device, image forming apparatus, method of manufacturing light source unit - Google Patents

Description

  The present invention relates to a light source unit, an optical scanning device, and an image forming device.

  An electrophotographic image forming apparatus includes an optical scanning device that forms an electrostatic latent image based on image data on an image carrier by scanning with a laser beam. The light scanning device is provided with a light source unit that emits the laser light. The light source unit includes an optical component such as a light source and a collimator lens, and a synthetic resin support that supports the optical component (for example, see Patent Document 1).

JP-A-9-218368

  By the way, the support formed of a synthetic resin may shrink and deform over time. For example, the support may be contracted and deformed over time due to release of residual stress generated during molding of the support. Further, the inside of the image forming apparatus is likely to be heated to a high temperature due to heat generated by a drive circuit of the light source, a drive motor of the rotary polygon mirror, and a heater of the fixing device. The support may shrink and deform over time.

  In the image forming apparatus, when the support contracts and deforms, the distance between the light source supported by the support and the collimator lens changes, and the focus of laser light on the surface of the image carrier is changed. The position may change.

  An object of the present invention is to provide a light source unit, an optical scanning device, and an image forming apparatus capable of suppressing a change in distance between a light source supported by a support formed of a synthetic resin and a collimator lens. It is in.

  A light source unit according to one aspect of the present invention includes a light source, a collimator lens, a support, and an adhesive. The collimator lens collimates the laser light emitted from the light source. In the support, a first support for supporting the light source and a second support for supporting the collimator lens are formed of synthetic resin. The adhesive adheres more between the second surface of the collimator lens and the second surface opposite to the first surface than the first surface on the light source side.

  An optical scanning device according to another aspect of the present invention includes the light source unit and an optical scanning unit that scans laser light emitted from the light source unit.

  An image forming apparatus according to another aspect of the present invention includes the optical scanning device and an image forming unit including an image carrier on which an electrostatic latent image is formed by light emitted from the optical scanning device.

  According to the present invention, there is provided a light source unit, an optical scanning device, and an image forming apparatus capable of suppressing a change in distance between a light source supported by a synthetic resin support and a collimator lens.

FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view of the light source unit according to the embodiment of the present invention. FIG. 3 is a plan view of the light source unit according to the embodiment of the present invention. FIG. 4 is a sectional view taken along line IV-IV in FIG. FIG. 5 is a schematic diagram of a main part of the light source unit according to the embodiment of the present invention. FIG. 6 is a schematic diagram of a main part of the light source unit according to the embodiment of the present invention. FIG. 7 is a schematic view of a main part of the light source unit according to the embodiment of the present invention. FIG. 8 is a schematic diagram of a main part of the light source unit according to the embodiment of the present invention. FIG. 9 is a flowchart for explaining a manufacturing process of the light source unit according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the following embodiments are examples embodying the present invention, and do not have characteristics that limit the technical scope of the present invention. The description may be made by using up, down, left, right, front and rear directions defined in the accompanying drawings.

[Schematic Configuration of Image Forming Apparatus 10]
First, a schematic configuration of the image forming apparatus 10 according to the embodiment of the present invention will be described.

  As shown in FIG. 1, the image forming apparatus 10 includes a plurality of image forming units 1 to 4, an intermediate transfer belt 5, an optical scanning device 6, a secondary transfer roller 7, a fixing device 8, a paper discharge tray 9, This is a color printer including a cassette 21, a transport path 22, and the like. Then, the image forming apparatus 10 forms a monochrome image or a color image on a sheet such as paper based on the input image data. Further, the image forming apparatus according to the present invention may be, for example, a facsimile machine, a copier, or a multifunction peripheral.

  Each of the image forming units 1 to 4 is an electrophotographic image forming unit including a photosensitive drum (image carrier), a charging device, a developing device, a primary transfer roller, a cleaning device, and the like. The image forming units 1 to 4 are arranged side by side along the running direction of the intermediate transfer belt 5, and constitute a so-called tandem type image forming unit. Specifically, toner images corresponding to C (cyan) in the image forming unit 1, M (magenta) in the image forming unit 2, Y (yellow) in the image forming unit 3, and K (black) in the image forming unit 4 are formed. Is done. The intermediate transfer belt 5 is an intermediate transfer member on which the toner images of the respective colors formed on the photosensitive drums of the image forming units 1 to 4 are intermediately transferred.

  The optical scanning device 6 includes a light source unit 61, a polygon mirror 62, a reflection mirror 63, a first scanning lens 64, a second scanning lens 65, and the like. The optical scanning device 6 scans the photosensitive drum of each of the image forming units 1 to 4 with the laser light emitted from the light source unit 61 based on the input image data of each color, thereby forming the photosensitive drum. An electrostatic latent image is formed on each.

  The light source unit 61 emits laser light corresponding to each of the image forming units 1 to 4. The polygon mirror 62 is an optical scanning unit that scans each laser beam emitted from the light source unit 61 along a predetermined scanning direction. Each of the laser beams scanned by the polygon mirror 62 is guided to the reflection mirror 63 via the first scanning lens 64 and the second scanning lens 65. Note that the first scanning lens 64 is also used as a scanning lens for a plurality of laser beams. Thereby, the number of first scanning lenses 64 is reduced and the height of the optical scanning device 6 is reduced. The reflection mirror 63 reflects each laser beam scanned by the polygon mirror 62 and irradiates the photoconductor drum of each of the image forming units 1 to 4. The focal length of the laser beam in the first scanning lens 64 and the second scanning lens 65 is, for example, 300 mm from the first scanning lens 64 as a starting point.

  In the image forming apparatus 10 configured as described above, a color image is formed on a sheet supplied from the sheet feeding cassette 21 along the transport path 22 in the following procedure, and the sheet after image formation is discharged to the discharge tray 9. Is done. The transport path 22 is provided with various transport rollers that transport the sheets stacked on the paper feed cassette 21 to the discharge tray 9 via the secondary transfer roller 7 and the fixing device 8.

  First, in each of the image forming units 1 to 4, the photosensitive drum is uniformly charged to a predetermined potential by the charging device. Next, the surface of each of the photosensitive drums is scanned with laser light based on image data by the optical scanning device 6 to form an electrostatic latent image on the surface of each of the photosensitive drums. The electrostatic latent image on each of the photosensitive drums is developed (visualized) as a toner image of each color by each of the developing devices. Note that toner (developer) is supplied to each of the developing devices from detachable toner containers 11 to 14 corresponding to each color.

  Subsequently, the toner images of the respective colors formed on the photosensitive drums of the image forming units 1 to 4 are sequentially superimposed on the intermediate transfer belt 5 and transferred by the respective primary transfer rollers. As a result, a color image based on the image data is formed on the intermediate transfer belt 5. Next, the color image on the intermediate transfer belt 5 is transferred by the secondary transfer roller 7 to a sheet conveyed from the paper feed cassette 21 via the conveyance path 22. Thereafter, the color image transferred to the sheet is heated by the fixing device 8 and is fused and fixed to the sheet. The toner remaining on the surface of each of the photosensitive drums is removed by each of the cleaning devices.

[Configuration of Light Source Unit 61]
Next, the details of the light source unit 61 mounted on the optical scanning device 6 will be described with reference to FIGS. 2 is a perspective view of the light source unit 61, FIG. 3 is a plan view of the light source unit 61, and FIG.

  First, as shown in FIGS. 2 to 4, the light source unit 61 includes a support 70, a substrate 71, a light source 72, a collimator lens 73, an aperture 74, a reflection mirror 75, a cylindrical lens 76, a reflection mirror 77, and the like. Prepare. The light source 72, the collimator lens 73, the aperture 74, and the reflection mirror 75 are provided corresponding to each of the photosensitive drums.

  The support 70 is an integrally molded member of a synthetic resin. For example, the support 70 may be an integrally molded member of a synthetic resin in which polycarbonate (PC) and polystyrene (PS) are mixed. In particular, the support 70 includes a first support 701 and a second support 702 integrally formed of a synthetic resin.

  The first support 701 is a wall that supports the light source 72, and the second support 702 is an installation unit that supports the collimator lens 73. The light source 72 is press-fitted and fixed in a through hole 711 (see FIG. 4) formed in the second support 702, and the collimator lens 73 is bonded to the second support 702 with an adhesive 723 (see FIG. 4). Fixed. The structure for fixing the collimator lens 73 will be described later in detail.

Each of the light sources 72 is a semiconductor laser device that emits a laser beam, and is mounted on the substrate 71. Specifically, after each of the light sources 72 is pressed into the through hole 711 of the first support portion 791, the terminals of each of the light sources 72 are fixed to the substrate 71 by soldering or the like. The light source 72 is a single beam light source that emits one laser beam or a monolithic multi-beam light source that can emit a plurality of laser beams. Each of the collimator lenses 73 makes the laser light emitted from each of the light sources 72 parallel. Each of the apertures 74 limits the optical path width of the laser light after passing through each of the collimator lenses 73.

  Each of the reflection mirrors 75 reflects the laser light emitted from the light source 72 toward the cylindrical lens 76. The cylindrical lens 76 converges each of the laser beams to form a line image on the reflection surface (deflection surface) of the polygon mirror 62. The reflection mirror 77 reflects each of the laser beams having passed through the cylindrical lens 76 and irradiates the polygon mirror 62 with the reflected laser beams.

  By the way, the support 70 formed of a synthetic resin may contract and deform with time. For example, the support 70 may be contracted and deformed with time due to release of residual stress generated during the formation of the support 70. Further, since the inside of the image forming apparatus 10 is likely to be heated to a high temperature due to heat generated by the substrate 71, the drive motor of the polygon mirror 62, and the heater of the fixing device 8, the support 70 is continuously used in the high temperature environment. May shrink and deform over time.

  In the image forming apparatus 10, when the support 70 contracts and deforms, the distance between the light source 72 supported by the support 70 and the collimator lens 73 changes, and the focus of the laser light on the surface of the photosensitive drum changes. The position may change. Such a change in the focus position of the laser beam causes deterioration in image quality.

  On the other hand, in the light source unit 61 and the image forming apparatus 10, since the collimator lens 73 is fixed by a fixing structure described later, the light source 72 and the collimator lens 73 supported by the support 70 formed of a synthetic resin are used. Is suppressed.

[Fixation structure of collimator lens 73]
FIG. 5 is an enlarged view of a main part of the light source unit 61 for explaining a fixing structure of the collimator lens 73 in the light source unit 61. In addition, although the fixing structure of one collimator lens 73 mounted on the light source unit 61 will be described, the other three collimator lenses 73 are also mounted with the same fixing structure.

  As shown in FIG. 5, in the light source unit 61, the light source 72 is fixed to the first support 701 by being pressed into the through hole 711 of the first support 701. Further, a pedestal 721 and a concave portion 722 are formed in the second support portion 702 integrally formed with the first support portion 701. The collimator lens 73 is arranged on the pedestal 721 and is fixed to the pedestal 721 by an adhesive 723.

  The pedestal 721 is, for example, a circle, an ellipse, or a rectangle in plan view. The concave portion 722 is formed around the pedestal 721 and has, for example, a donut shape or a hollow rectangular shape in plan view. In the optical axis direction of the light source 72, the width of the pedestal 721 is longer than the width of the collimator lens 73 in the same direction, and in the direction perpendicular to the optical axis direction, the width of the pedestal 721 is the width of the collimator lens 73 in the same direction. Shorter than.

In the light source unit 61, a step having a width d1 is provided between the upper surface of the second support portion 702 and the upper surface of the pedestal 721. Further, in the light source unit 61, a step having a width d2 is provided between the upper surface of the pedestal 721 and the upper surface of the concave portion 722. As described above, in the second support portion 702, since the pedestal 721 protrudes from the periphery, the adhesive 723 applied to the pedestal 721 is used.
Before curing, the deformation in the direction in which the adhesive 723 spreads around is suppressed by the surface tension.

  When the concave portion 722 is provided in the second support portion 702, the step between the upper surface of the second support portion and the upper surface of the pedestal 721 may be omitted. Further, the concave portion 722 may be omitted from the second support portion 702, and the pedestal 721 may be formed to protrude upward from the upper surface of the second support portion 702.

  The adhesive 723 is an ultraviolet curable resin that cures when irradiated with ultraviolet light. For example, the adhesive 723 is an acrylic resin acrylate, urethane acrylate, epoxy acrylate, or the like. The adhesive 723 is hardened from the outer periphery by the irradiation of the ultraviolet rays, and the adhesive 723 has residual stress which causes a temporal shrinkage deformation after the hardening. In particular, in order to improve production efficiency, it is desirable to shorten the irradiation time of ultraviolet rays. In this case, however, residual stress is likely to remain in the adhesive 723 because the surface is hardened and the interior is not easily hardened. .

  Note that the adhesive 723 is an example of a photo-curable resin, and may be a type of adhesive that is not limited to ultraviolet light and is cured by irradiation with light of another wavelength. In addition, the adhesive 723 may be another adhesive such as an adhesive that cures by reacting with moisture, as long as it is a type of adhesive that undergoes shrinkage deformation due to residual stress after curing.

  In the light source unit 61, the adhesive 723 is attached between the lower surface of the collimator lens 73 and the pedestal 721 of the second support 702. Here, a gap having a predetermined specific width is formed between the lower surface of the collimator lens 73 and the pedestal 721 of the second support portion 702, and the gap is filled with an adhesive 723.

  In the light source unit 61, the adhesive 723 also adheres between the second surface 732 of the collimator lens 73 opposite to the first surface 731 on the light source 72 side and the pedestal 721 of the second support 702. ing. On the other hand, in the light source unit 61, the adhesive 723 is not attached between the first surface 731 of the collimator lens 73 and the pedestal 721 of the second support 702. That is, in the light source unit 61, more adhesive 723 adheres between the second surface 732 of the collimator lens 73 on the side opposite to the first surface 731 than the first surface 731 on the side of the light source 72 and the second support portion 702. are doing.

  As a result, a residual stress is generated in the adhesive 723, which causes the adhesive 723 to shrink and deform over time. Therefore, the collimator lens 73 moves with time in the direction F1 away from the light source 72 by contraction deformation due to release of the residual stress of the adhesive 723. That is, the adhesive 723 displaces the collimator lens 73 in the direction F1 in which the distance between the light source 72 and the collimator lens 73 increases.

  On the other hand, as described above, in the light source unit 61, since the support 70 is formed of a synthetic resin, a residual stress is generated in the support 70 that causes the support 70 to contract and deform over time. Therefore, the collimator lens 73 moves with time in the direction F2 approaching the light source 72 by contraction deformation due to release of the residual stress of the support 70. That is, the support 70 displaces the collimator lens 73 in the direction F2 in which the distance between the light source 72 and the collimator lens 73 decreases.

  As described above, in the light source unit 61, the displacement of the collimator lens 73 in the direction F1 caused by the contraction deformation of the adhesive 723 cancels the displacement of the collimator lens 73 in the direction F2 caused by the contraction deformation of the support 70. Will be. Therefore, a change in the distance between the light source 72 and the collimator lens 73 supported by the synthetic resin support 70 can be suppressed. Thus, in the image forming apparatus 10, a change in the focus position of the laser light emitted from the optical scanning device 6 to the surface of the photosensitive drum is suppressed, and the deterioration of the image quality over time is suppressed.

  In the light source unit 61, the adhesive 723 may be attached between the first surface 731 of the collimator lens 73 and the second support 702. However, in this case, the distance between the first surface 731 of the collimator lens 73 and the second support portion 702 is set smaller than the distance between the first surface 731 and the second support portion 702 so that the amount of displacement of the collimator lens 73 in the directions F1 and F2 can be balanced. It is necessary to attach a large amount between the surface 732 and the second support portion 702. That is, in the light source unit 61, the adhesive 723 has the displacement amount of the collimator lens 73 in the direction F1 due to the contraction deformation of the adhesive 723 and the displacement amount in the direction F2 of the collimator lens 73 due to the contraction deformation of the support 70. It is only necessary that the coating be performed so as to be equivalent.

  By the way, when the specific width of the gap formed between the lower surface of the collimator lens 73 and the pedestal 721 of the second support portion 702 is large, the thickness of the adhesive 723 becomes large, so that the adhesive 723 contracts. The deformation amount of the deformation increases. Since the collimator lens 73 is displaced due to the amount of deformation of the adhesive 723, the specific width is appropriately set in advance so that the contraction deformation of the support 70 of the light source unit 61 can be offset. It is desirable to keep.

  For example, in the light source unit 61 formed by resin molding, a positional deviation of the laser light emitted from the light source 72 on the photosensitive drum may be about ± 0.08 mm. On the other hand, in the light source unit 61, the light source 72 is fixed to the first support 701 of the support 70. Therefore, the height of the collimator lens 73 may be moved during the optical axis adjustment. Here, assuming that the thickness of the collimator lens 73 is 4 mm or less and the viscosity of the adhesive 723 is such that it can be applied by an air cylinder, the amount of shrinkage deformation of the adhesive 723 is stable to a known value. It is empirically known that the specific width is 0.2 mm. Therefore, the specific width is preferably close to 0.2 mm. For example, if the specific width is about ± 0.02 mm (0.18 mm to 0.22 mm) with respect to 0.2 mm, the deformation amount of the contraction deformation of the adhesive 723 is reduced. It turns out that the change is small. On the other hand, the following equation (1) is established between the movement amount σx of the collimator lens 73 and the movement amount ΔX of the laser light on the polygon mirror 62. The focal length of the collimator lens 73 is fco, and the focal length of the cylindrical lens 76 is fcy.

Therefore, according to the above equation (1), the ratio (fco / fcy) of the focal length fco of the collimator lens 73 to the focal length fcy of the cylindrical lens 76 is determined by the following equation: the moving amount σx of the collimator lens 73 / the polygon of the laser light. The movement amount ΔX on the mirror 62 is obtained. For example, in the optical scanning device 6, the focal length fco of the collimator lens 73 is 15 mm, and the focal length fcy of the cylindrical lens 76 is 135 mm. As described above, by setting the ratio of the focal length fco of the collimator lens 73 to the focal length fcy of the cylindrical lens 76 in the optical scanning device 6 to 1/4 or less, the movement of the collimator lens 73 during the optical axis adjustment is performed. The amount can be kept within ± 0.02 mm.

[Method of Manufacturing Light Source Unit 61]
Next, an example of a method for manufacturing the light source unit 61 will be described with reference to FIGS. In the following description, S1, S2,... Represent identification codes of the assembly process of the light source unit 61. The assembling process of the light source unit 61 is a process of assembling parts to the support 70. The method of manufacturing the light source unit 61 described here includes each step executed according to the flowchart shown in FIG. 6, but may include other steps.

<Step S1>
First, in step S1, a support body 70 formed by molding is prepared. As described above, the support 70 is integrally formed with the first support 701, the second support 702, the pedestal 721, the recess 722, and the like.

<Step S2>
Next, in step S2, the light source 72 is fixed to the first support 701 by being pressed into the through hole 711 of the first support 701 of the support 70.

<Step S3>
Subsequently, in step S3, the substrate 71 is attached to the first support 701 of the support 70. The fixing of the substrate 71 to the first support portion 701 is performed, for example, by screwing using screws. At this time, the terminals of the light source 72 are connected to the wiring pattern of the substrate 71 by soldering or the like. FIG. 7 shows a main part of the support 70 after the substrate 71 and the light source 72 are fixed to the first support 701 in steps S1 to S3.

<Step S4>
In step S4, optical components such as the reflection mirror 75, the cylindrical lens 76, and the reflection mirror 77 are attached to the support 70 in a predetermined posture.

<Step S5>
Then, in step S5, a predetermined amount of the adhesive 723 is applied to the pedestal 721 of the second support portion 702 of the support 70. At this time, the adhesive 723 applied to the pedestal 721 is such that the upper end of the adhesive 723 is positioned above the gap having the specific width to be secured at least between the lower surface of the collimator lens 73 and the upper surface of the pedestal 721. It is applied to be located. The application of the adhesive 723 is performed using, for example, a dispenser (not shown) having an air cylinder. FIG. 8 shows a state in which the adhesive 723 is applied to the pedestal 721 of the second support portion 702 of the support 70. At this time, the adhesive 723 is not in contact with the collimator lens 73.

<Step S6>
Next, in step S6, the collimator lens 73 is disposed on the pedestal 721. Specifically, first, the collimator lens 73 is held between the light source 72 and the pedestal 721 while being held by a driving unit such as a robot arm (not shown), and the lower surface of the collimator lens 73 and the upper surface of the pedestal 721 are Is moved to a position where the gap having the specific width is formed. The driving unit is driven by a user operation or automatic driving, and holds the collimator lens 73 and moves the collimator lens 73.

  The collimator lens 73 is moved from the position between the light source 72 and the pedestal 721 toward the pedestal 721 by the driving unit. That is, the collimator lens 73 is moved along the traveling direction of the laser light emitted from the light source 72. At this time, the collimator lens 73 comes into contact with the adhesive 723 of the pedestal 721 and moves while pushing away the adhesive 723. Therefore, the adhesive 723 adheres to the second surface 732 side of the collimator lens 73. FIG. 9 shows a state where the collimator lens 73 is arranged on the pedestal 721 in step S6.

  As shown in FIG. 9, in step S6, the center P1 of the width of the collimator lens 73 in the traveling direction of the laser light from the light source 72 is closer to the light source 72 than the center P2 of the width of the pedestal 721 in the traveling direction. The arrangement of the collimator lens 73 is adjusted so as to exist in the above. This suppresses excessive adhesion of the adhesive 723 to the first surface 731 of the collimator lens 73, and reduces the amount of the adhesive 723 that adheres to the second surface 732 to the adhesive 723 that adheres to the first surface 731. A relationship larger than the amount of the adhesive 723 to be performed is easily realized.

<Step S7>
Thereafter, in step S7, the adhesive 723 is irradiated with ultraviolet light, whereby the adhesive 723 is cured and the collimator lens 73 is bonded and fixed to the second surface 732.

  As shown in FIG. 9, in the light source unit 61, the collimator lens 73 is positioned such that the first surface 731 of the collimator lens 73 coincides with the end of the pedestal 721 on the light source 72 side in the traveling direction. Are located. In a plan view, the collimator lens 73 may be housed in the pedestal 721, and the adhesive 723 may be attached to the entire lower surface of the collimator lens 73.

  Further, in the present embodiment, the color image forming apparatus 10 including the plurality of image forming units 1 to 4 has been described as an example, but the image forming apparatus according to the present invention is a monochrome image forming apparatus including one image forming unit. The present invention is also applicable to a corresponding image forming apparatus.

6 Optical Scanning Device 61 Light Source Unit 70 Support 701 First Support 702 Second Support 721 Pedestal 722 Concave 723 Adhesive 71 Substrate 72 Light Source 73 Collimator Lens 74 Aperture 75 Reflection Mirror 76 Cylindrical Lens 77 Reflection Mirror

Claims (8)

Light source,
Lens and
A support in which a first support for supporting the light source and a second support for supporting the lens are integrally formed of synthetic resin;
The lens and the second support are attached to the lens so that the laser light emitted from the light source adheres more to the second surface of the lens on the side opposite to the first surface than to the first surface on the light source side. Adhesive between the part and
A light source unit comprising:
A gap having a predetermined specific width is formed between the lower surface of the lens and the second support portion, which can cancel the shrinkage deformation of the support, and the adhesive is filled in the gap having the specific width. ,
Light source unit. The second support portion includes a pedestal on which the lens is arranged and a concave portion formed around the pedestal,
The light source unit according to claim 1, wherein the adhesive is adhered between the second surface and the pedestal of the second support portion.   The light source unit according to claim 1, wherein the adhesive is not attached between the first surface and the second support. Said support, a light source unit according to any one of claims 1 to 3 which is a molded member of a synthetic resin polycarbonate and polystyrene are mixed. Wherein the adhesive, the light source unit according to any one of claims 1 to 4 which is a photo-curable resin which is cured by light irradiation. A light source unit according to any one of claims 1 to 5 ,
An optical scanning unit that scans laser light emitted from the light source unit,
An optical scanning device comprising: An optical scanning device according to claim 6 ,
An image forming unit including an image carrier on which an electrostatic latent image is formed by light emitted from the optical scanning device;
An image forming apparatus comprising: A first step of applying an adhesive to a pedestal formed on the second support section of a support body in which a first support section supporting a light source and a second support section supporting a lens are integrally formed of a synthetic resin;
The lens is moved from the position between the light source and the pedestal toward the pedestal, and the first surface of the lens is closer to the light source than the first surface in the traveling direction of the laser light emitted from the light source. A second step of adhering the adhesive between the lens and the second supporting portion so as to adhere more to the second surface on the opposite side and disposing the adhesive on the pedestal;
A method for manufacturing a light source unit comprising:
A predetermined gap having a predetermined width is formed between the lower surface of the lens and the second support portion, the gap being capable of canceling out the shrinkage deformation of the support, and the gap is filled with the adhesive. ,
Manufacturing method of light source unit.

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