JP2011128424A - Lens pressing spring and laser light source device using lens pressing spring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the combined-wave laser light source device has a high output by condensing light beams after changing a plurality of laser modules into the parallel light beams by means of a collimator lens used in pairs with them, however, it is difficult to reduce the size of the laser light source device in the case where the collimator lens is fixed to a lens barrel by means of a plate spring without using an adhesive, such as outside gas, which has adverse effect on it. <P>SOLUTION: In a lens pressing spring (3), a plate spring (39) having a shape formed by cutting a collimator lens along two parallel lines symmetrical with respect to an optical axis and pressing two remaining non-effective areas of the arcuate portions includes: two curved portions (32) adjacent to each other along the outside of the arcuate portions of the collimator lens; approximately U-shaped ends (38) connected to the ends of the curved portions; and a pressing portion (33) sandwiched and connected between the two opposite ends of those ends (38). By suppressing the dimension of the radial direction of the collimator lens, a combined-wave laser light source of small size is obtained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens pressing spring for positioning a lens and a laser light source device using the lens pressing spring.

  The high-power laser light source device converts a plurality of laser beams emitted from a plurality of laser modules that are light sources into parallel beams by a plurality of collimator lenses that are paired with them, and then converts them into one laser beam by a condenser lens or the like. The desired power is obtained by condensing, that is, combining. Such a laser light source device is called a combined laser light source device.

  This combined laser light source device, unlike a laser light source device equipped with only one set of a laser module and a collimator lens, accurately holds a plurality of laser modules and a plurality of collimator lenses paired therewith at each designed position. There is a need to. For this reason, the combined laser light source device arranges the laser module and the collimator lens in a balanced manner at a certain interval, so that a large installation space is required structurally, and the size of the laser light source device is increased.

  In recent years, laser light source devices have increased the number of laser modules used in the combined laser light source device or used large laser modules capable of high output due to the demand for higher output. As a result, the number of collimator lenses used as a pair and the outer size of the collimator lens are increased, and in order to obtain a high-power combined laser light source device, the entire laser light source device has to be enlarged. Therefore, it is desired that the laser module and the collimator lens have a structure in which the arrangement interval is made as short as possible and the arrangement is efficiently and space-saving.

  On the other hand, the collimator lens used in the laser module is designed to be larger than the laser module because it receives the emitted light of the laser module having the radiation angle that is the beam divergence angle at a position separated by a certain distance. Therefore, in order to arrange a plurality of laser modules at high density, it is effective to reduce the collimator lens by reducing the ineffective portion provided on the outer periphery of the effective diameter of the collimator lens, rather than reducing the laser module. It is.

  In order to reduce the size of the laser light source device, it is conceivable to use an adhesive for fixing the collimator lens with a small ineffective portion. However, since the applied adhesive is more likely to protrude into the effective area, It is preferable to fix with a leaf spring or the like without using an agent. In addition, since the laser light source often has a high output, there is a problem that when the collimator lens is fixed with an adhesive, a harmful gas such as the adhesive becomes hot and the lens is fogged is generated. As a leaf spring for fixing the lens, a leaf spring having a pressing portion protruding in the center direction of the circle at three places in the circumferential direction with a ring-like plate material has been proposed (for example, Patent Document).

  JP 2006-243385 A (paragraph 0039, FIG. 6)

  However, when a leaf spring having a pressing portion that is a pressing portion protruding in the center direction of the lens as described in the patent document is used, the pressing portion needs a certain length for securing a deflection amount. There has been a problem that the outer diameter of the lens holding spring becomes large and the arrangement of the collimator lens cannot be made compact.

  In the lens pressing spring according to the present invention, the root portion connecting the support portion fixed to the lens barrel holding the lens and the leaf spring portion holding the lens to the lens barrel, and the outer peripheral surface of the lens from the root portion A bent portion extending along the outer side of the lens, having a substantially U shape and having one end connected to the tip of the bent portion, connected to the other end of the tip and the lens surface inside the outer peripheral surface of the lens And a holding part for holding the lens in the lens barrel.

The lens pressing spring according to the present invention can hold the lens while ensuring the length of the bent portion of the spring while suppressing the size of the lens in the radial direction.

1 is an exploded perspective view of a combined laser light source device according to Embodiment 1 of the present invention. It is a fragmentary sectional view of the combining laser light source apparatus which concerns on Embodiment 1 of this invention. It is a top view of the lens pressing spring which concerns on Embodiment 1 of this invention. It is the elements on larger scale of the lens pressing spring which concerns on Embodiment 1 of this invention. It is a top view of the lens pressing spring which concerns on Embodiment 1 of this invention. It is a top view when not mounting | wearing with the lens guide which concerns on Embodiment 1 of this invention. It is a top view at the time of mounting | wearing with the lens guide which concerns on Embodiment 1 of this invention. It is the elements on larger scale of the lens pressing spring which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view in which a combined laser light source device 1 employing a lens holding spring according to the present invention is disassembled in the optical axis direction, and FIG. 2 shows the combined laser light source device 1 passing through the optical axis of a laser module 5 along the Y axis. FIG. 3 is a plan view of the lens pressing spring 3. FIG. 4 is a partially enlarged view of the leaf spring portion of the lens pressing spring 3. FIG. 5 is a plan view of the lens pressing spring 3. 6 is a plan view of the state in which the collimator lens 4 is attached to the base 6 without using the lens guide 9 as viewed from the + Z direction, and FIG. 7 is a state in which the collimator lens 4 is attached to the base 6 using the lens guide 9. It is the top view seen from + Z direction.

  In FIG. 1, the upper side in the figure, which is the direction in which the laser module 5 emits the laser beam, is the + Z-axis direction, the lower side in the figure is the −Z-axis direction, and the three laser modules 5 are arranged in the direction. In the figure, the right side is the + X-axis direction, the opposite side is the -X-axis direction, and the back side in the figure is the direction in which two rows of three laser modules 5 are arranged in the + Y-axis direction. The front side in the figure, which is the opposite side, is taken as the -Y axis direction.

  The laser module 5 is a CAN package type of a semiconductor laser having a diameter of about 10 mm, and a laser beam is emitted in the + Z direction from an emission port 53 provided on the surface in the + Z direction in FIG. A terminal 52 for power supply is attached to the surface in the −Z direction, and a laser beam is emitted by supplying a predetermined power to the terminal from the outside. A flexible printed circuit (FPC) 8 is electrically connected to a terminal 52 of the laser module 5 with solder or the like and supplies power from the outside.

  The base 6 is a metal part, and has a function as a lens barrel that holds the laser module 5 and the collimator lens 4 on a single optical axis while maintaining a constant interval. As shown in FIG. 2, the laser module 5 is first inserted into the base 6 from the + Z direction. The laser module 5 determines the position in the Z direction, which is the optical axis A direction, with respect to the base 6 by applying the lower surface of the laser module 5 to the laser positioning surface 61 formed on the −Z direction side of the base 6. The laser module 5 is positioned and held by press-fitting into a laser holding surface 62 formed of a circular surface with the optical axis A as the central axis. The laser holding surface 62 is partially provided only in the Y direction in FIG. 1 when the laser modules are arranged close to each other.

  Next, the lens guide 9 is attached on the surface of the base 6 in the + Z direction. The lens guide 9 is for restricting the collimator lens 4 from rotating with the optical axis A stopped when the D-cut collimator lens 4 is attached to the base 6. The lens guide 9 is provided with guide holes 91 corresponding to the outer shapes of the arc portion 43 and the straight portion 44 of the collimator lens 4 in a plate-like member.

  Thereafter, the collimator lens 4 is attached to the base 6 from the + Z direction with air tweezers or the like. A chamfered portion 66 for facilitating insertion of the collimator lens 4 is formed at the end in the + Z direction of the lens holding surface 64 of the base 6. When the edge in the −Z direction of the collimator lens 4 hits the slope portion of the chamfered portion 66, the collimator lens 4 is guided to the lens holding surface 64 so as to slide and is positioned in the optical axis A direction by the lens positioning surface 63.

  The diameter of the arc portion 92 of the guide hole 91 provided in the lens guide 9 is larger than the maximum diameter of the end on the + Z side of the chamfered portion 66, so that the chamfered portion 66 is not blocked by the lens guide 9. Even when the collimator lens 4 is inserted into the base 6, the insertability by the chamfered portion 66 is not impaired.

  The collimator lens 4 is pressed against a lens positioning surface 63 formed on the + Z side of the base 60 to determine the position of the base 60 in the optical axis A direction. The position of the collimator lens 4 in the radial direction with respect to the base 6 is determined by the side surface 42 of the collimator lens 4 being restricted by the lens holding surface 64 formed on the outer periphery of the lens positioning surface 63. The lens holding surface 64 has a circular shape with the optical axis A as the center, but when the collimator lens 4 is close to the X direction, it is partially provided only in the Y direction. Thereby, the position of the collimator lens 4 with respect to the laser module 5 is determined via the base 6.

  The lens pressing spring 3 is fixed to the base 6, and the collimator lens 4 is pressed and held from the + Z direction by the plate spring portion 39 of the lens pressing spring 3. At this time, the pressing portion 33 of the leaf spring portion 39 does not block the effective diameter 45 indicating the effective area of the collimator lens 4, and the slit groove 34 is aligned with the position of the side surface 42 of the arc portion 43 of the collimator lens 4. Yes.

  As described above, the plate spring portion 39 of the lens pressing spring 3 increases the force with which the plate spring portion 39 presses the collimator lens 4 as the spring force of the bending portion 32 increases, and the pressing portion 33 follows the lens surface of the collimator lens 4. It deforms as follows. Therefore, even in the collimator lens 4 that has the straight portion 44 that is the D-cut portion and has few places to be held, the leaf spring portion 39 of the lens pressing spring 3 can have a strong holding force against vibration impact.

  The collimator lens 4 has a shape obtained by cutting two unnecessary portions not irradiated with the laser beam emitted from the laser module 5 into a D shape called a D cut. The collimator lenses 4 are arranged compactly by arranging the straight portions 44, which are the D-cut portions, next to each other as shown in FIG. For this reason, the hole 65 connecting the base 6 and the collimator lens 4 provided in the base 6 also has a shape in which the collimator lens 4 is connected in the adjacent X-axis direction as shown in FIG.

  The accuracy of positioning the laser module 5 and the collimator lens 4 at a predetermined position on the same axis requires several microns. For this reason, the base 6 is generally made of a metal material such as aluminum having high rigidity and good workability, and the positioning portions of the laser module 5 and the collimator lens 4 that require precision are machined. For the machining, rotary cutting is used so that the workability and the coaxiality can be easily obtained, and the machining is performed with an accuracy of several microns or less using a dedicated blade or the like.

  The lens holding spring 3 is a spring for fixing the collimator lens 4 to the base 6, and a hole 35 is provided at a position corresponding to the position of the collimator lens 4 with one flat sheet metal. The hole 35 is formed so as not to block the effective diameter of the collimator lens 4. In FIG. 4, two portions are cut in a straight line so as to correspond to the D-cut shape of the collimator lens 4. A straight portion 36 is formed. On the other hand, a leaf spring portion 39 for holding the arc portions 43 at both ends of the collimator lens 4 is integrally formed on the hole portion 35 side of the arc portion 37 cut into an arc shape. The support portion 3A is a portion outside the hole portion 35, and is fixed to the surface in the + Z direction of the base 6 that functions as a lens barrel by a reinforcing plate 2 described later.

  The lens holding spring 3 is mounted on the collimator lens 4 attached to the base 6. In FIG. 4, the root portion 31 of the leaf spring portion 39 is provided at the intersection of the straight line B and the arc portion 37 that pass through the optical axis of the collimator lens 4 and is parallel to the straight portion 36. That is, it coincides with a straight line connecting the centers in the circumferential direction of the two arc portions 43 of the collimator lens 4. The leaf spring portion 39 is provided in each of the two arc portions 37 facing each other.

  The bending portion 32 is formed on the hole 35 side of the arc portion 37 along the arc portion 37 from the base portion 31 serving as a fixed end toward the two linear portions 36. That is, there are two bent portions 32, one extending in the + X-axis direction from one root portion 31 and one extending in the -X-axis direction. A substantially U-shaped tip portion 38 is formed at an end portion of the bending portion 32 on the straight portion 36 side. One end of the distal end portion 28 is connected to the bending portion 32, and the other end is connected to a holding portion 33 that holds the collimator lens 4.

  The pressing portion 33 has an arc shape, and has an arc shape concentric with the arc portion 43 of the collimator lens 4. A continuous slit groove 34 having a substantially constant width is formed between the pressing portion 33 and the base portion 31 and between the pressing portion 33 and the bending portion 32. Both ends in the circumferential direction of the pressing portion 33 are connected to one end of a tip portion 38 provided in the + X direction from the root portion 31 and one end of a tip portion 38 provided in the −X direction from the root portion 31. .

  The outer periphery of the pressing portion 33 on the slit groove 34 side is formed so as to substantially coincide with the outer periphery of the arc portion 43 of the collimator lens 4. That is, the slit groove 34 is adjacent to the outside of the arc portion 43 of the collimator lens 4. On the other hand, the inner periphery of the pressing portion 33 is located outside an effective diameter 45 indicating an effective region through which the laser beam of the collimator lens 4 is transmitted. As a result, the pressing portion 33 does not block the laser beam. That is, the ineffective area of the lens surface along the arc portion 43 that is the outer peripheral surface of the lens can be suppressed. In FIG. 4, the position corresponding to the arc portion 43 of the collimator lens 4 is indicated by a circular broken line indicating the lens diameter 46.

  Further, the width dimension S of the pressing portion 33 is set to be sufficiently narrower than the width dimension L of the root portion 31 of the leaf spring portion 39, and the tip portion is designed to be less rigid. For example, the width dimension S of the pressing portion 33 is set to about 0.7 mm, which is about 1/5, when the dimension L of the root portion is about 3.7 mm. As a result, the holding portion 33 is deformed so as to follow the lens surface of the collimator lens 4.

  The reinforcing plate 2 is used to press and reinforce portions other than the plate spring portion 39 of the lens pressing spring 3 from the + Z direction. The reinforcing plate 2 is made of a flat metal plate thicker than the thickness of the lens pressing spring 3, and has a hole 21 that does not block the hole 35 of the lens pressing spring 3. The reinforcing plate 2 is mounted on the lens pressing spring 3 from the + Z direction, and is screwed together with the lens pressing spring 3 so that the plate spring portion 39 can press the collimator lens 4 with higher accuracy.

  As described above, the two bent portions 32 that are formed adjacent to each other along the arc portion 43 that is the outer peripheral surface of the collimator lens 4 from the base portion 31 that is the fixed end, and extend in the opposite direction of the circumference of the collimator lens 4. A substantially U-shaped tip end portion 28 having one end connected to the bending portion 37 and the other end connected to the pressing portion 33, and the hole portion 35 side of the bending portion 32 along the inner side of the arc portion 43 of the collimator lens 4. The collimator lens 4 is pressed by a leaf spring portion 39 having a holding portion 33 which is formed with a slit groove 34 sandwiched between the two tip ends and connected to both ends thereof, thereby suppressing the size of the lens in the radial direction. It is possible to hold the collimator lens 4 while securing the length of the bent portion of the spring. Accordingly, the collimator lens 4 that is compactly arranged by D-cutting is applied to the base 6 without using an adhesive having problems such as contamination of the lens due to outgas and management for maintaining the performance of the adhesive. A small combined laser source device 1 can be obtained.

  In the case where the light source is the laser module 5 as described above, the collimator lens is D-cut because the radiation angles in the X direction and Y direction in FIG. 1 are different. However, the emitted light rays are emitted in the X direction and the Y direction. In the case of a light source having no difference in corners, the lens cannot be D-cut, and a circular lens is used. Even in such a case, as shown in FIG. 5, the length of the bent portion of the spring can be reduced while suppressing the size of the lens in the radial direction by providing the leaf spring portion 39 at three positions of the hole portion 35. It is possible to secure and hold the collimator lens 4.

  Next, the lens guide 9 will be described in detail. In FIG. 6, the mounting portion of the base 6 for the collimator lens 4 is formed by a cylindrical hole centered on the optical axis A of the collimator lens 4, so that the collimator lens 4 rotates around the optical axis A. There is no way to stop it. For this reason, it can be seen that it is difficult to mount the collimator lens 4 so that the direction of the straight portion 44 that is the D-cut portion is aligned with the X direction by rotating around the optical axis. When the holding posture of the collimator lenses 4a to 4f in the base 6 varies, the leaf spring portion 39 of the lens pressing spring 3 and the arc portion 43 of the collimator lenses 4a to 4f do not coincide with each other. The lenses 4a to 4f cannot be held sufficiently. Therefore, it is necessary to rotate the collimator lenses 4a to 4f one by one so as to match the position of the leaf spring portion 39 of the lens pressing spring 3.

  Further, a gap is formed between the linear portions 44 of the collimator lenses 4a to 4f, and the hole portion 65 of the base 6 can be seen when viewed from the + Z direction. For this reason, there is a possibility that a screw, a part, or the like falls into the hole 65. This is because the cylindrical holes 65 are arranged in the base 6 in the X direction. On the other hand, the collimator lens 4 has two linear portions 44. For this reason, the collimator lens 4 cannot block the portion of the hole 65 corresponding to the straight portion 44, and a gap is generated.

  As shown in FIGS. 1 and 7, the lens guide 9 is provided with guide holes 9a to 9f having a shape corresponding to the collimating lens 4 on a flat sheet metal. The diameter of the arc portion 92 of the guide holes 91 a to 91 f is larger than the diameter of the arc portion of the lens holding surface 64 of the base 6. A bridge 93 is provided to separate the collimator lenses 4 adjacent to each other in the X direction and suppress the rotation of the optical axis of the collimator lens 4. The guide holes 91a to 91f are provided so that the optical axes of the paired collimator lenses 4a to 4f coincide with each other.

  In FIG. 7, when the collimator lens 7 is attached after the lens guide 9 is attached to the base 6, the collimator lenses 4 a to 4 f are connected to the arc portion of the lens holding surface 64 provided on the base 6 and the guide hole 91 a of the lens guide 9. Or it can be attached to the base 6 by being restricted by the bridge 93 which is a straight portion of 91f.

  As a result, the collimator lenses 4 a to 4 f cannot rotate more than the gap with the bridge 93 that is a linear portion of the lens guide 9. Therefore, the positional relationship with the lens pressing spring 3 to be mounted from above can be easily determined. Moreover, since the linear part 44 of the collimator lens 4 can be attached to the base 6 adjacently, the combined laser light source device 1 can be reduced in size. Moreover, since the lens guide 9 is attached, the gap formed between the collimator lenses 4a to 4f and the base 6 is also closed, so that the screws and parts can be prevented from falling.

  The thickness of the lens guide 9 is not particularly specified, but if it is 0.10 mm or more, there is no problem such as deformation, and the rotation of the collimating lens 4 around the optical axis A can be restricted. Further, by attaching a plurality of lens guides 9, the pressing force of the lens pressing spring 3 to the collimator lens 4 can be adjusted. For example, by sandwiching two lens guides 9, the spring force of the leaf spring portion 39 that presses the collimator lens 4 can be weakened. On the other hand, by reducing the number of lens guides 9, the leaf spring portion 39 of the lens pressing spring 3 bends correspondingly, so that the spring force for pressing the collimator lens 4 can be increased.

  By using a plurality of such thin lens guides 9 and increasing / decreasing in accordance with the lens thickness variation of the collimator lens 4 and the processing variation of the base 6, the leaf spring portion 39 that holds the collimator lens 4 is increased. The spring force can be adjusted easily.

Embodiment 2. FIG.
In the first embodiment, the bent portion 32 formed along the arc portion 43 of the collimator lens 4 from the base portion 31 serving as the fixed end, and the one end connected to the bent portion 37 and connected to the holding portion 33 are substantially omitted. A leaf spring portion 39 having a U-shaped tip portion 28 and a pressing portion 33 formed on the hole portion 35 side of the bending portion 32 through the slit groove 34 along the arc portion 43 of the collimator lens 4. Indicated. This is a configuration in which the tip portions of the two bending portions 32 are connected by the pressing portion 33. In the second embodiment, a configuration having one bent portion 32 from a root portion 31 serving as a fixed end will be described.

  FIG. 8 is an enlarged partial enlarged view of the leaf spring portion of the lens pressing spring 3. In addition, the same code | symbol is attached | subjected to the same component as FIG. 3, and the description is abbreviate | omitted.

  In the case of the first embodiment, the base portion 31 of the leaf spring portion 39 is provided at the intersection of the straight line B passing through the optical axis of the collimator lens 4 and parallel to the straight portion 36 and the arc portion 37. In other words, the arc portion 37 is provided at the center of the arc length. On the other hand, in the second embodiment, it is provided so as to be biased toward one straight line portion 36 with respect to the straight line X that is the central axis.

  First, the upper leaf spring portion 39a in FIG. 8 will be described. The root portion 31a is provided so as to be biased toward one straight portion 36a with respect to the straight line B which is the central axis. The bending portion 32a extends from the root portion 31a to the other linear portion 36b side along the outer periphery of the arc portion 43 of the collimator lens 4. Since the bent portion is formed outside the arc portion 43 of the collimator lens 4, it does not hit the collimator lens 4. In FIG. 8, the position corresponding to the arc portion 43 of the collimator lens 4 is indicated by a circular broken line indicating the lens diameter 46.

  A substantially U-shaped tip portion 38a is formed at the end portion of the bending portion 32a on the linear portion 36b side. One end of the distal end portion 38 a is connected to the bending portion 32 a, and the other end is connected to a pressing portion 33 a that holds the collimator lens 4. The hole portion 35 side of the distal end portion 38a is in contact with the collimator lens 4 and is pressed so that the collimator lens 4 does not move in the optical axis direction. However, in this case, a part of the arc portion 43 of the collimator lens 4 on the side of the straight portion 36b is pressed, so that the collimator lens 4 is stably held by pressing the entire arc portion 43. A portion 33a is provided.

  The pressing portion 33a is connected to the end portion on the hole portion 35 side of the distal end portion 38a and extends along the arc portion 43 of the collimator lens 4 toward the straight portion 36a. If the pressing portion 33a is only formed in the same plane as the sheet of the lens pressing spring 3, the pressing portion 33a floats when the portion on the hole 35 side of the tip portion 38a contacts the collimator lens 4, and the collimator lens 4 cannot be held.

  Therefore, the holding portion 33 is previously bent or warped in the −Z direction, which is the collimator lens 4 side in the optical axis direction, or a protrusion protruding in the −Z direction at the end portion of the holding portion 33a on the linear portion 36a side. By providing the portion, the collimator lens 4 can be pressed not only on the + X direction side on the straight line portion 36b side of the straight line X but also on the −X direction side on the straight line portion 36a side.

  As described above, the base portion 31a provided to be deviated toward the straight line portion 36a with respect to the straight line X that is the central axis, and the other portion so as to follow the outer periphery of the arc portion 43 of the collimator lens 4 from the root portion 31a. A bent portion 32a extending toward the straight portion 36b, a substantially U-shaped tip portion 38a connected to the end portion of the bent portion 32a, and a collimator connected to the other end portion of the tip portion 38a toward the straight portion 36a. By having a leaf spring portion 39a having a pressing portion 33a for pressing the collimator lens 4 extending along the arc portion 43 of the lens 4, the length of the bent portion of the spring is secured while suppressing the size in the radial direction of the lens. It becomes possible to do. Accordingly, the collimator lens 4 that is compactly arranged by D-cutting is applied to the base 6 without using an adhesive having problems such as contamination of the lens due to outgas and management for maintaining the performance of the adhesive. A small combined laser source device 1 can be obtained.

  The other leaf spring portion 39 b is formed in a point-symmetric shape with respect to the optical axis A of the collimator lens 4.

  DESCRIPTION OF SYMBOLS 1 Laser light source device, 3 Lens pressing spring, 31 Root part, 32 Deflection part, 33 Holding part, 38 Tip part, 39 Leaf spring part, 3A Support part, 4 Collimator lens, 43 Arc part, 44 Linear part, 5 Laser module 6 base.

Claims (7)

A root portion that connects a support portion fixed to a lens barrel that holds the lens and a leaf spring portion that holds the lens and holds the lens barrel;
A bent portion extending adjacently along the outside of the outer peripheral surface of the lens from the root portion;
A tip portion having a substantially U shape and one end connected to the tip of the flexible portion;
A lens pressing spring provided with a pressing portion that is connected to the other end of the tip portion and presses the lens surface inside the outer peripheral surface of the lens to hold the lens on the lens barrel.   The bending portion includes two extending from the base portion in the opposite direction of the lens circumference, and the other end of each of the two distal ends connected to the distal ends of the two bending portions sandwiches the pressing portion. The lens pressing spring according to claim 1, wherein the lens pressing spring is connected to both ends in a circumferential direction.   The lens pressing spring according to claim 1, wherein the lens pressing portion is bent or warped toward the lens side in the lens optical axis direction.   The lens pressing spring according to claim 1, wherein a convex portion protruding toward the lens side in the optical axis direction of the lens is provided at a tip portion of the lens pressing portion.   2. The lens according to claim 1, wherein the lens has a shape having straight portions cut by two straight lines symmetrical to the optical axis, and the leaf spring portion presses the lens surface inside two arc portions of the lens. 5. The lens holding spring according to any one of 4 above. A lens holding spring according to any one of claims 1 to 5,
A laser light source device comprising: a laser module that emits laser light; a collimator lens that collimates the laser light; and a lens barrel that holds the collimator lens by the lens holding spring. A lens holding spring according to claim 5;
A plurality of laser modules that emit laser light; a plurality of collimator lenses that form a pair with the laser module that converts the laser light into parallel light; and a lens barrel that holds the collimator lens by the lens holding spring;
The laser light source device in which the plurality of collimator lenses are arranged so that the linear portions are adjacent to each other.

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