JP2011151308A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device that easily adjusts an optical axis of collimate light with a minimum adjustment margin. <P>SOLUTION: A collimator lens 25 is fixed to a holder 20, and a light emitting unit 30 having a semiconductor laser 32 is fixed while having the distance to the collimator lens 25 optimized. A projection 26 is formed at the tip of the holder 20, and a recess 16 is formed in a support portion 15, the projection 26 and the recess 16 abutting against each other at an abutting portion E to adjust the tilt of the holder 20. The position of the support portion 15 is adjusted with respect to a base 11, and the tilt of the holder 20 is adjusted to align an optical axis O2 of the collimate light with a reference optical axis O1 of the base 11. The center Og of a spherical surface of the projection 26 is at a light emission origin 25a, so misalignment of the light emission origin 25a when the holder 20 is tilted is prevented. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light emitting device that is used in a projector, an optical reproducing device, an optical recording device, an optical communication device, and the like and that emits light with a light source.

  The following Patent Document 1 and Patent Document 2 disclose an optical pickup provided with a light emitting device.

  The optical pickup is provided with a light emitting unit for recording or reproducing data. In this light emitting unit, a semiconductor laser is housed as a light source in a case, and laser light emitted from the semiconductor laser is emitted forward as diffused light from a window in front of the case. As described in Patent Documents 1 and 2, since the light emitting unit has a semiconductor laser mounting error in the case, the optical axis of the emitted laser light does not necessarily coincide with the center line of the case.

  Therefore, in the optical pickups described in Patent Literature 1 and Patent Literature 2, a sub-holder for holding the case of the light emitting unit is provided. A convex spherical surface centered on the semiconductor laser is formed on the sub-holder, and a concave spherical surface is formed on the main holder provided on the housing. By sliding the convex spherical surface to the concave spherical surface, the inclination of the optical axis of the light emitted from the semiconductor laser can be adjusted.

JP 2005-310319 A Japanese Patent Laid-Open No. 2005-312103

  The light emitting device mounted on the optical pickup described in Patent Document 1 and Patent Document 2 can adjust the inclination of the light emitting unit in which only the semiconductor laser is housed in the case, and the laser light emitted from the semiconductor laser. The collimator lens that uses the diffused light as the collimated light remains fixed in the casing.

FIG. 7 is an explanatory diagram for explaining the problem of the structure.
In FIG. 7, a light passage hole 2 is opened in the base 1, and a collimator lens 3 is fixed inside the light passage hole 2. In the light emitting unit 4, a semiconductor laser chip 6 is accommodated in a case 5. In the light emitting devices described in Patent Document 1 and Patent Document 2, the tilt of the light emitting unit 4 is adjusted by sliding between the convex portion and the concave portion, and the optical axis Ob of the laser light emitted from the light emitting unit 4 is changed to the base 1 The incident is going to be made at the right angle as possible.

  However, since the collimator lens 3 is fixed independently of the light emitting unit 4, when only the inclination of the light emitting unit 4 is adjusted, the optical axis Ob of the laser light emitted from the light emitting unit 4 and the collimator lens 3 An axis deviation δ is likely to be formed with respect to the optical axis Oa, and when this axis deviation δ increases, the laser light that has passed through the collimator lens 3 cannot be made into highly accurate collimated light.

  Therefore, when the light emitting unit 4 is attached, the distance between the light emitting unit 4 and the collimator lens 3 is changed to adjust the light emitting point of the chip 6 to the focal point of the collimator lens, and the adjustment to change the inclination of the light emitting unit 4; Further, the light emitting unit 4 is moved in a direction perpendicular to the optical axis, and at least three or more adjustment operations are performed to eliminate the axial deviation δ between the optical axis Ob of the light emitting unit 4 and the optical axis Oa of the collimator lens 3. Therefore, it is necessary to combine them at the same time, and the adjustment work becomes complicated.

  Further, the adjustment margin is widened as much as the adjustment of the axis deviation δ shown in FIG. 7 is necessary. Therefore, the amount of movement for moving the light emitting unit 4 in the direction crossing the optical axis becomes large, and the base 1 must be enlarged accordingly.

  The present invention solves the above-described conventional problems, and maintains the distance between the light source and the collimator lens, minimizes the axial deviation between the light source and the collimator lens, and adjusts the direction of the optical axis of the collimated light to the minimum. An object of the present invention is to provide a light emitting device that can be adjusted by the above method.

  The present invention also provides a light emitting device having a structure in which it is not necessary to form a light passage hole having a large diameter in the base when adjusting the tilt of the holder holding the light source and the lens, and the base can be easily miniaturized. The purpose is to do.

The present invention provides a light emitting device provided with a light source and a lens that converts light emitted from the light source into collimated light.
The holder holds the light source and the lens positioned in front of the light emitting direction of the light source, and a base to which the holder is attached is provided with a support portion that supports the holder,
A convex portion is formed on the holder, and a concave portion is formed on the support portion, and at least a part of the surface of one of the convex portion and the concave portion is on a virtual spherical surface whose center is located on the central axis of the holder. Positioned, the surface of the convex part and the surface of the concave part slide, and the holder is adjusted so that the optical axis of the lens is inclined and fixed to the support part,
The lens is characterized by being located rearward from the base with respect to a contact portion between the convex portion and the concave portion.

  In the light emitting device of the present invention, since the light source and the lens are held in the holder, the focal length of the light source and the lens can be adjusted in the holder. In addition, since the light source and the lens are stored close to each other in the holder, even if there is a deviation of the optical axis between the light source and the lens, the deviation amount can be minimized. Unlike FIG. 7, the adjustment work of moving the light emitting unit in the direction orthogonal to the optical axis can be eliminated only for the purpose of forming accurate collimated light. Therefore, complication of the adjustment operation of the light emitting unit can be suppressed, and the adjustment margin can be easily reduced when adjusting the light emitting unit.

  In the holder, the lens and the light source are located behind the contact part between the convex part and the concave part. Therefore, when the inclination of the holder is adjusted by sliding the convex part and the concave part, light emission occurs. The deviation between the light emission starting point of the unit and the reference optical axis on the base side can be reduced. This also reduces the adjustment margin for adjusting the position of the optical axis.

  In the present invention, it is preferable that the center of the phantom spherical surface substantially coincides with the intersection of the central axis and the outermost surface on the light emitting side of the lens.

  In the light emitting unit, since the intersection of the central axis and the outermost surface on the light emitting side of the lens is a light emission starting point of collimated light, the holder is tilted with the light emission starting point as a fulcrum, thereby shifting the optical axis of the lens. Tilt adjustment can be performed while minimizing.

  According to the present invention, the support portion may be fixed to the base by adjusting a position in a direction orthogonal to the optical axis of the lens.

  As described above, since the shift of the optical axis of the collimated light due to the tilt adjustment of the holder can be minimized, the adjustment margin in the adjustment work for moving the support portion in the direction orthogonal to the optical axis of the lens can be reduced. Therefore, it is easy to reduce the thickness of the light emitting device.

  In the present invention, a light passage hole through which the collimated light passes is opened in the base, and a tip portion on the light emission side of the holder is located rearward from an opening portion of the light passage hole. Is preferred.

  Since the holder equipped with the light source and lens is tilted and adjusted outside the light passage hole, there is no need to adjust the inner diameter of the light passage hole. It is easy to make the device thinner.

  Further, according to the present invention, a bracket is provided separately from or integrally with the base behind the contact portion between the convex portion and the concave portion, and the holder is held by the bracket. It is preferable that

  When the tilt of the holder is adjusted outside the light passage hole, the holder after the tilt is adjusted can be stably fixed by holding the holder with the bracket.

  In this case, it is preferable that the bracket is provided with a first adjustment mechanism that adjusts the posture of the holder so that the optical axis is inclined.

  Adjustment work can be facilitated by adjusting the tilt of the light emitting unit with the adjustment mechanism provided on the bracket.

  In addition, the tilt of the optical axis may be finely adjusted by pressing the holder by an adjustment mechanism in a state where the holder is fixed to the support portion. By this adjustment, it is possible to adjust the fine tilt of the optical axis of the collimated light.

  According to the present invention, the holder is provided with an extension portion that extends forward, which is inward of the base, rather than a contact portion between the convex portion and the concave portion, and the extension portion holds the base. It may be what has been done.

  Also in this case, the base may be provided with a second adjustment mechanism that adjusts the posture of the holder so that the optical axis is inclined.

  Furthermore, in the present invention, the lens is fixed in the holder, and the light emitting unit including the light source is fixed in the holder after the position in the optical axis direction is adjusted.

  In the present invention, a holder for storing a light emitting unit including a light source and a lens is used, and the tilt of the light emitting unit is adjusted together with the holder. In the holder, the optical axis misalignment between the light source and the lens can be made very small. The adjustment margin when adjusting the position of the optical axis can be reduced.

  Further, since the lens is retracted rearward from the contact portion between the convex portion and the concave portion for adjusting the tilt, the positional deviation of the light emission starting point of the collimated light is reduced when the holder is tilted and adjusted. This also makes it easy to reduce the adjustment margin.

The partial perspective view which shows the light-emitting device of embodiment of this invention, An exploded perspective view of the light emitting device; Exploded perspective view of the light emitting unit, A cross-sectional view of the light emitting device, An enlarged sectional view of the light emitting device, Sectional drawing which shows the light-emitting device of 2nd Embodiment, Explanatory drawing explaining the conventional problem,

The light emitting device 10 shown in FIG. 1 is mounted on an RGB light emitting module.
The RGB light emitting module includes a light emitting unit that generates red (R) laser light, a light emitting unit that generates green (G) laser light, and a light emitting unit that generates blue (B) laser light. Is installed. 1 and the following drawings show a light emitting device 10 to which any one of RGB light emitting units is attached. In the light emitting device 10, the Y1 side is the front and the Y2 side is the rear.

  As shown in FIG. 2, the base 11 has light passage holes 12 formed in three locations, and any one light emitting unit of RGB faces one light passage hole 12. The light emitted from the light emitting unit toward the light passage hole 12 is reflected by a reflecting plate or the like so that the RGB laser beams can pass on the same optical axis. The RGB light emitting module selects one of the light emitting units to emit light, so that the red (R) laser light, the green (G) laser light, and the blue (B) laser light are on the same optical axis. Can be irradiated. For example, it is used in a projector that forms a color image in which three primary colors are mixed.

  The light emitting device 10 has a cylindrical holder 20. The holder 20 is made of a metal material. As shown in FIGS. 4 and 5, the holder 20 has a lens holding hole 21 that opens at the tip 20 a on the light emission side. A stepped portion 21 a is formed at the rear end portion on the Y2 side of the lens holding hole 21. The collimator lens 25 is composed of a single lens, and the diameter thereof is formed such that it can be inserted with almost no gap on the inner peripheral surface of the lens holding hole 21. The collimator lens 25 is inserted into the lens holding hole 21, pressed against the stepped portion 21a, positioned, and fixed with an adhesive or the like. The collimator lens may be configured by combining a plurality of lenses.

  A unit housing hole 22 is formed in the holder 20 continuously to the rear of the lens holding hole 21, and a unit positioning hole 23 having a larger diameter is formed behind the unit housing hole 22. The unit positioning hole 23 opens at the rear end of the holder 20. The light emitting unit 30 is housed in the unit housing hole 22 and is held so as not to move in a direction perpendicular to the optical axis in the unit positioning hole 23.

  As shown in FIGS. 4 and 5, the light emitting unit 30 has a support substrate 31. The support substrate 31 is formed of a metal material into a disk shape. A semiconductor laser 32 that emits laser light of any one of RGB colors is mounted as a light source on the front surface of the support substrate 31, and linear terminals 34 that are electrically connected to the respective electrodes of the semiconductor laser 32 are located behind the support substrate 31. It extends to. Insulating layers are provided between the support substrate 31 and the semiconductor laser 32 and between the support substrate 31 and the linear terminals 34. A metal case 33 is fixed in front of the support substrate 31, and the semiconductor laser 32 is sealed inside the case 33. A window 33a for emitting light emitted from the semiconductor laser 32 to the front is opened on the front surface of the case 33, and the window 33a is closed with a transparent plate.

  As shown in FIGS. 4 and 5, the case 33 of the light emitting unit 30 is inserted into the unit accommodation hole 22 in the holder 20, and the support substrate 31 is inserted into the unit positioning hole 23.

  The diameter of the support substrate 31 and the inner diameter of the unit positioning hole 23 are almost the same, and the outer peripheral surface of the support substrate 31 is inserted into the unit positioning hole 23 with almost no gap. As shown in FIG. 3, holding grooves 31 a are formed at three locations on the outer peripheral surface of the support substrate 31. By holding the holding groove 31a with a jig and moving the jig back and forth, the outer peripheral surface of the support substrate 31 can be slid on the inner peripheral surface of the unit positioning hole 23 and moved back and forth. In this operation, the light emitting point 32a of the semiconductor laser 32 is adjusted to the focal point of the collimator lens 25, and the support substrate 31 and the holder 20 are fixed to the holder 20 by means such as laser welding.

  Since the light emitting unit 30 is position-adjusted forward and backward in the holder 20, the diffused light of the laser light emitted forward from the light emitting point 32 a is converted into collimated light by the collimator lens 25 and the light emitting unit 30 It will be output forward.

  In the manufacturing process of the light emitting unit 30, an attachment error of the semiconductor laser 32 on the support substrate 31 may occur, and the optical axis of the laser light emitted from the light emitting point 32 a is relative to the optical axis of the collimator lens 25. There is a possibility of tilting slightly. However, since the light emitting point 32a of the semiconductor laser 32 and the collimator lens 25 are very close to each other inside the holder 20, the axial deviation between the light emitting point 32a and the optical axis of the collimator lens 25 is slight and is almost ignored. be able to.

  As shown in an enlarged view in FIG. 5, a convex portion 26 is formed on the outer peripheral surface of the tip 20 a on the light emission side of the holder 20. The convex portion 26 coincides with a part of the hypothetical spherical surface G assumed on the space. That is, the convex portion 26 is formed in a band shape around the optical axis between the latitude G1 and the latitude G2 in the hemisphere ahead (Y1 direction) of the equator that goes around the center Og of the phantom spherical surface G. .

  The center Og of the phantom spherical surface G is positioned on the center axis Oh of the holder 20 in front of the light emitting point 32a of the semiconductor laser 32. As shown in FIGS. 3 and 5, the central axis Oh coincides with the central axes of the lens holding hole 21, the unit accommodation hole 22, and the unit positioning hole 23 formed in the holder 20. In the most preferred embodiment, as shown in FIG. 5, the center Og of the phantom spherical surface G is a light emission starting point 25 a that is the intersection of the frontmost surface (outgoing surface) of the collimator lens 25 and the center axis Oh of the holder 20. It almost matches.

  As shown in FIGS. 2, 4, and 5, a support portion 15 is provided on the surface 11 a of the base 11 at the opening of the light passage hole 12. The support portion 15 is formed of a metal in a ring shape. The attachment surface 15b facing the Y1 direction of the support portion 15 is a flat surface, and the attachment surface 15b is attached in close contact with the surface 11a of the base 11 and fixed by laser welding or the like. A center hole 15 a penetrating in the front-rear direction is opened at the center of the support portion 15, and the inner diameter of the center hole 15 a is formed larger than the inner diameter of the light passage hole 12.

  The support portion 15 is formed with a recess 16 facing rearward. As shown in an enlarged view in FIG. 5, the surface of the recess 16 coincides with a part of a virtual sphere different from the virtual sphere G. A radius R2 of the phantom spherical surface forming the recess 16 is set to be smaller than a radius R1 of the phantom spherical surface G with which the convex portion 26 coincides. Further, the center of the radius R <b> 2 is located on the center axis Oh of the holder 20. Therefore, the contact portion E where the convex portion 26 contacts the concave portion 16 coincides with the opening edge that faces the rear portion (Y2 direction) of the concave portion 16.

  As shown in FIGS. 1, 2, and 3, a bracket 40 is fixed to the base 11. The bracket 40 is formed with an attachment surface 40a facing the front Y1 on the outer peripheral portion. The mounting surface 40a is a flat surface, is in close contact with the surface 11a of the base 11, and is fixed by laser welding or the like.

  A holding hole 41 is formed in the bracket 40 at a position away from the surface 11 a of the base 11 in the rear (Y2 direction). The inner diameter of the holding hole 41 is sufficiently larger than the diameter of the holder 20. The bracket 40 is formed with four female screw holes 41a radially opening toward the holding hole 41, and a holding screw 42 is screwed into each female screw hole 41a. As shown in FIG. 4, the holder 20 is held from the outside by a holding screw 42 behind the contact portion E.

Next, an example of a method for attaching the holder 20 and the like will be described.
As shown in FIG. 3, the collimator lens 25 is inserted into the lens holding hole 21 of the holder 20, the collimator lens 25 is pressed against the stepped portion 21 a and positioned, and fixed with an adhesive or the like. The light emitting unit 30 is inserted from the rear toward the inside of the holder 20, and the support substrate 31 is inserted into the unit positioning hole 23 without a gap. The holding groove 31 a of the support substrate 31 is held by a jig, the light emitting unit 30 is moved back and forth in the holder 20, the light emitting point 32 a of the semiconductor laser 32 is matched with the focal point of the collimator lens 25, and the lens of the holder 20 Collimated light can be emitted forward from the holding hole 21. After this adjustment, the support substrate 31 and the holder 20 are fixed by laser welding or the like.

  The light emitting unit 30 may be emitted with the optical axis of the laser light being inclined with respect to the central axis of the case 33 due to the mounting error of the semiconductor laser 32. However, since the light emitting point 32a of the semiconductor laser 32 and the collimator lens 25 are close to each other, the axial deviation between the optical axis of the laser light emitted from the light emitting point 32a and the optical axis of the collimator lens 25 is almost negligible. .

  The support portion 15 is held by a jig, and is installed so that the attachment surface 15 b is in close contact with the surface 11 a of the base 11. Further, the holder 20 that has been assembled is held by another jig, and the convex portion 26 at the tip of the holder 20 is abutted against the concave portion 16 formed in the support portion 15.

  The jig holding the holder 20 is moved, the convex portion 26 and the concave portion 26 are slid at the contact portion E to tilt the holder 20, and the optical axis O2 of the collimated light converted by the collimator lens 25 is Adjustment work is performed so as to be parallel to the reference optical axis O1 (the center line of the light passage hole 12) set on the base 11. Moreover, the jig | tool holding the support part 15 is moved to a X direction and a Z direction, and the adjustment operation | work which aligns the optical axis O2 of collimated light and the reference | standard optical axis O1 of the base 11 is performed. Either of these two types of adjustment operations may be performed first, or can be performed simultaneously.

  As shown in FIG. 5, since the collimator lens 25 is located behind (in the Y2 direction) the contact portion E between the convex portion 26 and the concave portion 16, the convex portion 26 is included inside the holder 20. The center Og of the phantom spherical surface G and the light emission starting point 25a on the surface of the collimator lens 25 are easily brought close to each other. The amount can be reduced. As shown in FIG. 5, when the center Og of the phantom spherical surface G is coincident with the light emission starting point 25a, theoretically, when the tilt of the holder is adjusted, the axial deviation between the light emission starting point 25a and the reference optical axis O1 is obtained. Is zero. In order to reduce the axial deviation of the light emission starting point 25a, it is preferable that the center Og of the phantom spherical surface G be within the range of the center thickness of the lens in front of and behind the light emission starting point 25a. Most preferably, the light emission starting point 25a coincides with the center Og.

  In addition, the distance between the light emitting point 32a of the semiconductor laser 32 and the collimator lens 25 is determined in the holder 20, and even if there is an attachment error of the semiconductor laser 32, the distance between the light emitting point 32a and the center of the collimator lens 25. The axis deviation is so small that it can be ignored. Therefore, unlike the conventional example shown in FIG. 7, it is not necessary to adjust the axial deviation between the light emitting point 32 a of the semiconductor laser 32 and the optical axis of the collimator lens 25. Therefore, the adjustment margin for moving the support portion 15 in the X direction and the Z direction can be made extremely small.

  Further, since the holder 20 is located behind (Y2 side) from the opening of the light passage hole 12 and a part of the holder 20 does not enter the inside of the light passage hole 12, the diameter of the light passage hole 12 is minimized. Can be. The diameter of the light passage hole 12 can be reduced and the adjustment margin for moving the support portion 15 is small, and the light emitting device 10 can be easily configured to be thin.

  As described above, after the tilt adjustment of the holder 20 and the position adjustment of the support portion 15 are completed, the support portion 15 and the base 11 are fixed by laser welding, and the holder 20 and the support portion 15 are fixed by laser welding. .

  Thereafter, the mounting surface 40a of the bracket 40 is abutted against the surface 11a of the base 11, and the bracket 40 and the base 11 are fixed by laser welding. Alternatively, the bracket 40 is fixed to the base 11 with screws.

  After fixing the bracket 40 to the base 11, the holding screws 42 are screwed into the four female screw holes 41 a formed in the bracket 40, and the holding force for holding the holder 20 from four directions as shown by arrows in FIG. 4. Give F. The holder 20 is in an unstable support state in which the convex portion 26 at the tip thereof is welded and fixed to the support portion 15, but the place away from the welded portion of the holder 20 is held by the holding screw 42. Thus, the holder 20 is stably fixed.

  After the support portion 15 is fixed to the base 11 by laser welding and the tip of the holder 20 is fixed to the support portion 15 by laser welding, the screwing amounts of the four holding screws 42 are adjusted, and the holding screws 42 are adjusted. It is also possible to finely adjust the inclination of the optical axis O2 of the collimated light by varying the holding force F. When the holder 20 is pushed in the direction crossing the optical axis O2 by the holding force F of the holding screw 42, the welded portion between the convex portion 26 and the support portion 15 is deformed, and the inclination of the optical axis O2 of the collimated light is changed. Slight correction and fine adjustment. That is, the holding screw 42 can be used as a first adjustment mechanism for adjusting the tilt of the holder 20.

  FIG. 6 is a cross-sectional view showing a light emitting device 110 according to the second embodiment of the present invention. Of the constituent members of the light emitting device 110, the same parts as those of the light emitting device 10 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Also in the holder 120 used in the light emitting device 110, the collimator lens 25 is located behind (in the Y2 direction) the contact portion E between the convex portion 26 and the concave portion 16. An extension 120 a that extends into the light passage hole 12 of the base 11 is provided at the tip of the holder 120. Except that the extension 120a is provided, the structure of the holder 120 is the same as that of the holder 20 of the first embodiment.

  Further, a holding screw 42 is screwed onto the base 11, and a holding force F can be applied to the extension 120 a of the holder 120 inside the light passage hole 12. Since the holder 120 is held by laser welding of the convex portion 26 and the concave portion 16 and the coercive force F of the holding screw 42, the holder 120 is stably fixed without being detached.

  Also in this case, the holding screw 42 is used as the second adjustment mechanism, and after the holder 120 and the support portion 15 are welded, the holding force F of the holding screw 42 is varied, thereby causing deformation of the welded portion. Thus, the tilt of the holder 120 can be finely adjusted.

  In the embodiment, the center Og of the virtual spherical surface G including the convex portion 26 formed at the front portion of the holders 20 and 120 is coincident with the light emission starting point 25a, and the radius R2 of the virtual spherical surface including the concave portion 16 is the same. It is shorter than the radius R1 of the phantom spherical surface G. However, conversely, the center of the phantom spherical surface including the recess 16 may coincide with the light emission starting point 25a, and the radius R1 may be shorter than the radius R2.

  Or the recessed part 16 currently formed in the support part 15 is a cylindrical hole extended in a Y1-Y2 direction, Comprising: The opening edge may be the contact part E with the convex part 26. FIG. However, as shown in FIG. 5, if both the convex portion 26 and the concave portion 16 are formed of a part of a spherical surface, the gap between the convex portion 26 and the concave portion 16 other than the contact portion E can be reduced, and the support portion 15 and It becomes easy to fix the holder 20 by laser welding.

DESCRIPTION OF SYMBOLS 10 Light-emitting device 11 Base 12 Light passage hole 15 Support part 16 Recess 20 Holder 21 Lens holding hole 22 Unit accommodation hole 23 Unit positioning hole 25 Collimator lens 25a Light emission origin 26 Projection part 30 Light emission unit 31 Support substrate 32 Semiconductor laser 32a Light emission point 33 Case 40 Bracket 41 Holding hole 42 Holding screw 120 Holder 120a Extension part E Contact part G Virtual spherical surface O1 Reference optical axis O2 Collimated light optical axis Og Virtual spherical center Oh The central axis of the holder

Claims (10)

In a light emitting device provided with a light source and a lens that converts light emitted from the light source into collimated light,
The holder holds the light source and the lens positioned in front of the light emitting direction of the light source, and a base to which the holder is attached is provided with a support portion that supports the holder,
A convex portion is formed on the holder, and a concave portion is formed on the support portion, and at least a part of the surface of one of the convex portion and the concave portion is on a virtual spherical surface whose center is located on the central axis of the holder. Positioned, the surface of the convex part and the surface of the concave part slide, and the holder is adjusted so that the optical axis of the lens is inclined and fixed to the support part,
The light emitting device according to claim 1, wherein the lens is positioned rearward from the base with respect to a contact portion between the convex portion and the concave portion.   The light emitting device according to claim 1, wherein the center of the phantom spherical surface substantially coincides with an intersection of the central axis and the outermost surface on the light emitting side of the lens.   The light emitting device according to claim 1, wherein the support portion is fixed to the base by adjusting a position in a direction orthogonal to an optical axis of the lens.   2. A light passage hole through which the collimated light passes is opened in the base, and a tip portion on the light emission side of the holder is located rearward from an opening portion of the light passage hole. 4. The light emitting device according to any one of 3 to 3.   2. A bracket is provided separately from or integrally with the base behind the contact portion between the convex portion and the concave portion, and the holder is held by the bracket. 5. The light emitting device according to any one of 4 to 4.   The light-emitting device according to claim 5, wherein the bracket is provided with a first adjustment mechanism that adjusts the orientation of the holder so that the optical axis is inclined.   The light emitting device according to claim 6, wherein the tilt of the optical axis is finely adjusted by pressing the holder by the adjustment mechanism in a state where the holder is fixed to the support portion.   The holder is provided with an extension portion that extends forward, which is inward of the base, rather than a contact portion between the convex portion and the concave portion, and the extension portion is held by the base. Item 5. The light emitting device according to any one of Items 1 to 4.   The light-emitting device according to claim 8, wherein the base is provided with a second adjustment mechanism that adjusts the orientation of the holder so that the optical axis is inclined.   The lens according to claim 1, wherein the lens is fixed in the holder, and the light emitting unit including the light source is fixed in the holder after the position in the optical axis direction is adjusted. Light emitting device.

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