JP4919616B2 - Laser sumi appearance device - Google Patents

Description

The present invention relates to a laser marking device , and more particularly to a laser marking device capable of emitting line light at a very wide angle.

  In recent years, a laser marking device that projects a straight line onto a wall or the like with a laser beam is used for marking the reference line at a construction site or the like. The laser marking device includes a housing, and a wide-angle lens and a lens barrel having a laser light source are provided in the housing. An irradiation window is formed in the housing. The wide-angle lens is disposed in the housing at a position facing the irradiation window, and faces the opening of the lens barrel from which the laser is emitted. The laser beam emitted from the laser light source is incident on the wide-angle lens, becomes line light that has been widened to 180 ° or more by the wide-angle lens, is emitted from the wide-angle lens, and is emitted from the irradiation window to the outside of the housing.

As the wide-angle lens, a cylindrical rod lens is generally used. Incident light that enters the rod lens from the outside in the radial direction of the rod lens is separated into transmitted light and reflected light on the incident surface of the rod lens. The transmitted light becomes line light having a spread of nearly 180 ° on the exit side of the rod lens, and the reflected light becomes line light having a spread of nearly 180 ° on the incident side of the rod lens, which are connected to each other in a straight line. Therefore, it becomes one line light having a spread of about 360 °. Such a wide-angle lens is described in, for example, Japanese Patent Application Laid-Open No. 2004-94120 (Patent Document 1).
JP 2004-94120 A

  However, in the conventional wide-angle lens, one line light composed of reflected light and transmitted light is projected onto a wall or the like. In each of the line portion by reflected light and the line portion by transmitted light, A portion having a high line intensity where the light is bright and a portion having a low line intensity where the light on the line is not relatively bright are generated.

  Furthermore, there is also a difference in line intensity at the position of the boundary between the line portion due to the reflected light and the line portion due to the transmitted light, and it has been difficult to obtain line light with uniform line intensity.

In view of the above , an object of the present invention is to provide a laser marking device having a wide-angle lens capable of obtaining line light with uniform line intensity.

In order to achieve the above object, the present invention has a most incident side and a most exit side, and is laminated in a direction connecting the most incident side and the most exit side, and has an entrance side and an exit side, respectively. A plurality of cylindrical lenses, comprising a wide-angle lens for emitting line light from the outermost emission side with respect to an input from the most incident side , and a laser light source capable of emitting a laser beam to the wide-angle lens A laser marking device , wherein the plurality of cylindrical lenses have an arc-shaped convex lens surface that is disposed at a position on the outermost emission side and is capable of transmitting light on the emission side, and an arc that is capable of transmitting light on the incident side. A first cylindrical lens having a concave lens surface having a shape, and an arc-shaped concave lens surface that is disposed closer to the most incident side than the first cylindrical lens and is capable of transmitting light on the emission side, Light on the incident side And a second cylindrical lens having at least one cylindrical lens having a concave lens surface of the over possible arc-convex lens surface of a outer surface of the first cylindrical lens the exit side, except the concave lens surface of the incident side This portion is a rough surface, and is the outer surface of the second cylindrical lens, the concave lens surface on the exit side, and the portion other than the concave lens surface on the incident side is a rough surface, and is a part of the outer surface of the first cylindrical lens. And a portion of the rough surface and a portion of the outer surface of the second cylindrical lens that is a rough surface are in contact with each other .

The second cylindrical lens includes a first sub-cylindrical lens having an arc-shaped concave lens surface capable of transmitting light on the emission side and an arc-shaped concave lens surface capable of transmitting light on the incident side; A second sub-cylindrical lens having an arc-shaped concave lens surface capable of transmitting light on the side and having an arc-shaped concave lens surface capable of transmitting light on the incident side; The outer surface of the first sub-cylindrical lens, the concave lens surface on the output side, and the portion other than the concave lens surface on the incident side are formed of a rough surface. 2 The outer surface of the cylindrical lens other than the concave lens surface on the emission side and the concave lens surface on the incident side is a rough surface, and is a part of the outer surface of the first sub-cylindrical lens. It is preferable that the contact with each other and become part and the second sub-cylindrical portion at a consisting rough surface portion of the outer surface of the lens.

According to the laser marking device of claim 1, a plurality of units having a most incident side and a most emitting side and stacked in a direction connecting the most incident side and the most emitting side, each having an incident side and an emitting side. Line strength in line light when using a conventional cylindrical rod lens because it consists of a single cylindrical lens and a wide-angle lens is used to emit line light from the most exit side in response to input from the most incident side. It is possible to prevent as much as possible the generation of a portion having a high level and a portion having a low line strength.

  In addition, when a conventional cylindrical rod lens is used, a difference in line intensity occurs at the boundary between the line portion due to reflected light and the line portion due to transmitted light, but the reflected light is not used. Therefore, it is possible to prevent such a difference in line intensity from occurring. For this reason, line light with uniform line intensity can be obtained.

  In addition, the plurality of cylindrical lenses are arranged at the position of the most emission side, have an arc-shaped convex lens surface that can transmit light on the output side, and have an arc-shaped concave lens surface that can transmit light on the incident side. 1 cylindrical lens and an arc-shaped concave lens surface which is disposed at a position closer to the most incident side than the first cylindrical lens, has an arc-shaped concave lens surface capable of transmitting light on the exit side, and has an arc-shaped concave lens surface capable of transmitting light on the incident side. Since the second cylindrical lens having at least one cylindrical lens is provided, line light having a wide angle of 180 ° or more can be emitted.

  In addition, since the cylindrical lens is configured by the cylindrical lens, the concave lens surface and the convex lens surface are not elliptical or the like but are arcs as described above, and the manufacturing is relatively simple, and the cost for manufacturing the lens portion is reduced. Can be reduced.

A laser marking device according to an embodiment of the present invention will be described. As shown in FIG. 1, the laser marking device 1 includes a stand 2, a base 3, a housing 4, and a main body 10. In the following description, the stand 2 side is the lower side and the housing 4 side is the upper side. The stand 2 is disposed on a floor (not shown). The base 3 is rotatably mounted on the stand 2.

  The housing 4 is provided on the base 3, and a space 4 a is defined by the base 3 and the housing 4. As shown in FIG. 2, a horizontal irradiation window 4 b is formed on the front side of the laser marking device 1 of the housing 4. A horizontal irradiation window dust cover 5 made of the same material as a vertical irradiation window dust cover 6 described later is attached to the housing 4 so as to close the horizontal irradiation window 4 b. The horizontal irradiation window 4b opens toward the outside of the housing 4 in a direction parallel to the floor (not shown).

  Further, a vertical irradiation window 4c having a substantially arc shape extending from the upper side to the lower side of the drawing is formed on the upper side of the horizontal irradiation window 4b of the housing 4 so as to include the paper surface of FIG. A vertical irradiation window dustproof cover 6 made of a film material made of polyester or the like that can transmit line light, which will be described later, is attached to the housing 4 so as to close the vertical irradiation window 4c.

  As shown in FIG. 1, an arch-shaped ceiling irradiation window portion 7 is attached to the upper portion of the housing 4. In the ceiling irradiation window portion 7, a ceiling irradiation window 7 a made up of a long hole communicating the inside and the outside of the housing 4 is formed so as to form an arch shape including the paper surface of FIG. 1. Then, as shown in FIGS. 1 and 3, a ceiling irradiation window dustproof cover 8 made of a film material made of polyester or the like capable of transmitting line light, which will be described later, is attached to the ceiling irradiation window portion 7 so as to close the ceiling irradiation window 7a. It has been. Therefore, the ceiling irradiation window dustproof cover 8 has an arch shape so as to cover a ceiling wide-angle lens portion 17 described later.

  As shown in FIG. 2, the main body 10 is arranged in the space 4a. The main body 10 includes a frame 11, a gimbal mechanism 12, a lens barrel 13, a laser light source 14, a horizontal wide-angle lens unit 15, a vertical wide-angle lens unit 16, a ceiling wide-angle lens unit 17, and a beam splitter 18. I have. The frame 11 is provided on the base 3. The gimbal mechanism 12 is disposed at the upper end of the frame 11. The lens barrel 13 is suspended from the gimbal mechanism 12 so that the longitudinal direction of the lens barrel 13 in FIG. 2, that is, the laser beam irradiation direction indicated by reference numeral 14A in FIG. The horizontal wide-angle lens unit 15, the vertical wide-angle lens unit 16, and the ceiling wide-angle lens unit 17 correspond to a wide-angle lens.

  The lens barrel 13 is formed with a first tunnel 13 a that extends in the vertical direction and opens at the upper end of the lens barrel 13. Further, a second tunnel 13b that is orthogonal to the first tunnel 13a and penetrates in the front-rear direction (the left-right direction in FIG. 2) of the laser marker 1 is formed at a position facing the horizontal irradiation window 4b of the lens barrel 13. Has been. A third tunnel 13c that communicates with the first tunnel 13a and extends toward the vertical irradiation window 4c is formed above the portion of the lens barrel 13 where the second tunnel 13b is formed. The inner peripheral surfaces of the tunnels 13a, 13b, and 13c are subjected to alumite treatment for preventing light reflection.

  The laser light source 14 is disposed in the opening on the rear side of the second tunnel 13 b of the lens barrel 13. More specifically, the laser light source 14 is a diode-excited solid-state laser, emits a green laser, and has a wavelength of 532 nm. The horizontal wide-angle lens unit 15 is provided in an opening on the front side of the second tunnel 13b of the lens barrel 13 and faces the horizontal irradiation window 4b. The vertical wide-angle lens unit 16 is provided at the opening of the third tunnel 13 c and faces the vertical irradiation window dustproof cover 6. The ceiling wide-angle lens unit 17 is provided in the opening at the upper end of the first tunnel 13 a of the lens barrel 13 and faces the ceiling irradiation window dustproof cover 8.

  The beam splitter 18 is disposed in the first tunnel 13 a of the lens barrel 13. The beam splitter 18 includes a holder 18A, a first half mirror 18B, and a second half mirror 18C. The holder 18A is fixed to the lens barrel 13. The first half mirror 18B has a substantially rectangular shape, and is fixed so as to form an angle of 45 ° with respect to the vertical direction at a portion where the first tunnel 13a and the second tunnel 13b of the holder 18A intersect. The second half mirror 18C also has a substantially rectangular shape, and is fixed to a portion of the holder 18A facing the third tunnel 13c so as to form an angle of approximately 30 ° with respect to the vertical direction.

Next, the horizontal wide-angle lens unit 15, the vertical wide-angle lens unit 16, and the ceiling wide-angle lens unit 17 will be described based on FIGS. 5 and 6, respectively. The horizontal wide-angle lens unit 15 has an outermost incident side 15A on which a laser beam is incident, that is, a lower part of the horizontal wide-angle lens unit 15 shown in FIG. 6 and the upper portion of the horizontal wide-angle lens portion 15 shown in FIG. 6, which are stacked in a direction connecting the most incident side 15A and the most emission side 15B, and each have an incident side and an emission side. A substantially plate-shaped first cylindrical lens 151, a spacer 153, and a second cylindrical lens 152 are configured.

  Here, the cylindrical lens is a well-known lens. Specifically, it has a concave lens surface or a convex lens surface on one surface, the other surface, or both surfaces of a substantially rectangular plate-like glass. A lens. In the case of a concave lens surface, an arc that forms a part of the side surface of the cylinder at a position of an intermediate portion of a pair of long sides or a position of an intermediate portion of a pair of short sides of the substantially rectangular shape is a pair of long sides or a pair of short sides. It is formed as a concave lens surface parallel to the side. Therefore, the deepest part of the recess is disposed at a position intermediate between the pair of long sides or a position intermediate between the pair of short sides. In the case of a convex lens surface, the position of the most projecting portion of the entire surface of one or the other surface of the substantially rectangular plate-shaped glass or the entire surface of both is the pair of long sides of the substantially rectangular shape. A circular arc forming a part of the side surface of the cylinder is formed as a convex lens surface parallel to the pair of long sides or the pair of short sides so as to be an intermediate position or a position between the pair of short sides.

  Therefore, for example, when the concave lens surface is provided on one surface of the plate-like glass and parallel to the pair of long sides, the circle is viewed from the short side of the rectangular plate-like glass. An arc-shaped groove is formed on one surface of the plate-like glass and is formed at the position of the middle part of the pair of long sides from one of the pair of short sides to the other. . The cylindrical lens has an advantage that the concave lens surface and the convex lens surface are not elliptical or the like, but are arcs as described above, and thus the manufacturing is relatively simple and the cost for manufacturing the cylindrical lens is low.

  As shown in FIG. 6, the first cylindrical lens 151 of the horizontal wide-angle lens unit 15 is disposed at the position of the most emitting side 15B in the horizontal wide-angle lens unit 15, and is an arc-shaped convex lens capable of transmitting light to the emitting side. A concave lens surface 151B having an arc shape that has a 151A surface and is capable of transmitting light on the incident side. The plate-like glass constituting the first cylindrical lens 151 has a long side of about 8 mm, a short side of 6 mm, and a maximum thickness of about 2 mm.

  In the first cylindrical lens 151, the axis of the cylinder when the convex lens surface 151 </ b> A and the concave lens surface 151 </ b> B are considered to be arcs forming a part of the side surface of the cylinder is a rectangular plate shape that constitutes the first cylindrical lens 151. It is oriented parallel to the short side of the glass, and the curvature of the arc of the convex lens surface 151A is R6 mm. Further, the curvature of the arc of the concave lens surface 151B is about R of 1 mm and the opening width is about 3 mm.

  The first cylindrical lens 151 is made of SF6, and the refractive index is about 1.8 when the wavelength of the laser beam is 546.07 nm. Since the refractive index of the first cylindrical lens 151 is larger than the refractive index of the second cylindrical lens 152 described later, the line light can be greatly widened.

  The convex lens surface 151A and the concave lens surface 151B have a high light transmittance by being polished. The outer surface of the first cylindrical lens 151 other than the convex lens surface 151A and the concave lens surface 151B is not polished and is a rough surface, which looks like glass. For this reason, the light transmittance of this portion is lower than the light transmittance of the convex lens surface 151A and the concave lens surface 151B, and the line light emitted from the most emitting side 15B is incident on the laser beam or the like from this portion. It is configured not to be affected by. For this reason, it is possible to prevent the line light from being partially shaded, and uniform line light can be obtained.

  As shown in FIG. 6, the second cylindrical lens 152 is disposed at a position closer to the most incident side 15A than the first cylindrical lens 151, and has an arc-shaped concave lens surface 152A capable of transmitting light on the emission side. In addition, the incident side has an arc-shaped concave lens surface 152B that can transmit light having the same shape as the concave lens surface 152A on the output side. The plate-like glass constituting the second cylindrical lens 152 has a long side of 6 mm, a short side of about 5 mm, and a maximum thickness of about 1 mm.

  In the second cylindrical lens 152, when the concave lens surfaces 152 </ b> A and 152 </ b> B are considered to be arcs that form a part of the side surface of the cylinder, the axis of the cylinder is that of the rectangular plate-like glass constituting the second cylindrical lens 152. The concave lens surfaces 152B and 152A on the entrance side and the exit side are each R3 mm in curvature and about 3 mm in opening width.

  The second cylindrical lens 152 is made of BK7, and the refractive index is 1.5 when the wavelength of the laser beam is 546.07 nm. Since the second cylindrical lens 152 is composed of an inexpensive BK7, the cost for the wide-angle lens can be reduced.

  The concave lens surfaces 152A and 152B, like the first cylindrical lens 151, have a high light transmittance by being polished. The outer surface of the second cylindrical lens 152 other than the concave lens surfaces 152A and 152B is not polished and is a rough surface, as if it is a ground glass. For this reason, the light transmittance of this portion is lower than the light transmittance of the concave lens surfaces 152A and 152B, and the line light emitted from the most emitting side 15B is affected by the incidence of a laser beam or the like from this portion. It is configured not to receive.

  The spacer 153 has a rectangular plate shape, the long side is 6 mm, the short side is about 5 mm, and the thickness L is about 1 mm. As shown in FIG. 6, a through hole 153 a is formed at a substantially central position of the spacer 153. The through hole 153a is formed so as to penetrate from one surface of the plate-like spacer 153 to the other surface, and the opening of the through hole 153a on one surface and the other surface is circular. The diameter of the opening is larger than the opening width of the concave lens surface 151B of the first cylindrical lens 151 and larger than the opening width of the concave lens 152A on the emission side of the second cylindrical lens 152.

  As shown in FIG. 6, the first cylindrical lens 151 and the second cylindrical lens 152 are spaced apart from each other by a predetermined distance via a spacer 153, and are arranged on the outer surface on the incident side of the first cylindrical lens 151. Thus, the portion other than the lens surface 151B and one surface of the plate-like spacer 153 are arranged in contact with each other. Further, the other surface of the plate-like spacer 153 and the outer surface on the emission side of the second cylindrical lens 152 other than the lens surface 152A are arranged in contact with each other.

  Further, the exit-side convex lens surface 151A and the entrance-side concave lens surface 151B of the first cylindrical lens 151 and the exit-side concave lens surface 152A and the entrance-side concave lens surface 152B of the second cylindrical lens 152 are respectively provided on one side surface of a cylinder. The axial center of the cylinder when it is considered as a circular arc forming a part is arranged on the same plane indicated by a one-dot chain line P in FIG. The same plane P is oriented in the vertical direction in the figure and is perpendicular to the paper surface. For this reason, the line light is emitted symmetrically about the same plane P. The vertical wide-angle lens unit 16 has the same configuration as that of the horizontal wide-angle lens unit 15 and thus will not be described. Since the vertical wide-angle lens unit 16 and the horizontal wide-angle lens unit 15 have the same configuration, the cost of the wide-angle lens can be reduced.

  The ceiling wide-angle lens unit 17 includes a most incident side 17A on which a laser beam is incident, that is, a lower portion of the ceiling wide-angle lens unit 17 illustrated in FIG. 5 and an outermost emission side 17B from which line light is emitted. 5 and the upper portion of the figure of the wide-angle ceiling lens portion 17 shown in FIG. 5, which are stacked in the direction connecting the most incident side 17A and the most emitting side 17B, and each has an incident side and an emitting side. A substantially plate-shaped first cylindrical lens 171, a first sub-cylindrical lens 172, and a second sub-cylindrical lens 173 are configured. The first sub-cylindrical lens 172 and the second sub-cylindrical lens 173 constitute a second cylindrical lens.

  As shown in FIG. 5, the first cylindrical lens 171 of the ceiling wide-angle lens unit 17 is disposed at the position of the most emitting side 17B in the ceiling wide-angle lens unit 17. The first cylindrical lens 171 of the ceiling wide-angle lens unit 17 has the same configuration as the first cylindrical lens 151 of the horizontal wide-angle lens unit 15, and thus description thereof is omitted. Since the first cylindrical lens 171 of the ceiling wide-angle lens unit 17 and the first cylindrical lens 151 of the horizontal wide-angle lens unit 15 have the same configuration, the cost of the wide-angle lens can be reduced.

  As shown in FIG. 5, the first sub-cylindrical lens 172 is disposed at a position closer to the most incident side 17A than the first cylindrical lens 171, and has an arc-shaped concave lens surface 172A capable of transmitting light on the emission side. And has an arcuate concave lens surface 172B capable of transmitting light on the incident side. The plate-like glass constituting the first sub-cylindrical lens 172 has a long side of 6 mm, a short side of about 5 mm, and a maximum thickness of about 1 mm.

  In the first sub-cylindrical lens 172, the axis of the cylinder when the concave lens surfaces 172A and 172B are considered to be arcs forming a part of the side surface of the cylinder has a rectangular plate shape constituting the first sub-cylindrical lens 172. It is oriented parallel to the long side of the glass, the curvature of the concave lens surface 172B on the incident side is R about 1 mm, and the aperture width is about 2 mm. The curvature of the concave lens surface 172A on the exit side is R3 mm, and the opening width is about 3 mm.

  The first sub-cylindrical lens 172 is composed of BK7, and the refractive index when the wavelength of the laser beam is 546.07 nm is 1.51825≈1.5. Since the first sub-cylindrical lens 172 and the second sub-cylindrical lens 173, which will be described later, are configured with an inexpensive BK7, the cost of the wide-angle lens can be reduced.

  The concave lens surfaces 172A and 172B have a high light transmittance by being polished. The outer surface of the first sub-cylindrical lens 172 other than the concave lens surfaces 172A and 172B is not polished and has a rough surface, which looks like glass. For this reason, the light transmittance of this portion is lower than the light transmittance of the concave lens surfaces 172A and 172B, and the line light emitted from the most emitting side 17B is affected by the incidence of a laser beam or the like from this portion. It is configured not to receive. Since the second sub-cylindrical lens 173 has the same configuration as the first sub-cylindrical lens 172, description thereof is omitted. Since the second sub-cylindrical lens 173 and the first sub-cylindrical lens 172 have the same configuration, the cost of the wide-angle lens can be reduced.

  As shown in FIG. 5, the outer surface on the incident side of the first cylindrical lens 171 and a portion other than the concave lens surface 171B, and the outer surface on the output side of the first sub-cylindrical lens 172 and a portion other than the concave lens surface 172A Are arranged in contact with each other. Further, the outer surface on the incident side of the first sub cylindrical lens 172 other than the concave lens surface 172B and the outer surface on the output side of the second sub cylindrical lens 173 other than the concave lens surface 173A are in contact with each other. Are arranged.

  Further, the exit-side convex lens surface 171A and the entrance-side concave lens surface 171B of the first cylindrical lens 171, the exit-side concave lens surface 172A and the entrance-side concave lens surface 172B of the first sub-cylindrical lens 172, and the second sub-cylindrical lens. When the exit-side concave lens surface 173A and the entrance-side concave lens surface 173B of 173 are considered to be arcs forming part of the side surface of the cylinder, the axis of the cylinder is the same plane indicated by the alternate long and short dash line Q in FIG. Is placed on top. The same plane Q is oriented in the vertical direction in the figure and is perpendicular to the paper surface. For this reason, the line light is emitted symmetrically about the same plane Q.

  Since the lens portions 15 to 17 are configured as described above without using the conventionally used rod lens, the output of the laser beam emitted from the laser light source can be obtained even when a green laser is used as the laser. The strong portion can be widened, and the occurrence of a portion having a high line strength and a portion having a low line strength in the line light when a conventional cylindrical rod lens is used can be prevented as much as possible.

  In addition, when a conventional cylindrical rod lens is used, a difference in line intensity occurs at the boundary between the line portion due to reflected light and the line portion due to transmitted light, but the reflected light is not used. Therefore, it is possible to prevent such a difference in line intensity from occurring. For this reason, line light with uniform line intensity can be obtained.

  In addition, as described above, the lens portion has the arc-shaped convex lens surfaces 151A and 171A that are arranged at the positions of the most emitting sides 15B and 17B and can transmit light on the emitting side, and have an arc-shaped concave lens that can transmit light on the incident side. A substantially plate-shaped first cylindrical lens 151, 171 having surfaces 151B, 171B, and a position closer to the most incident side 15A, 17A than the first cylindrical lens 151, 171 and can transmit light to the emission side Second cylindrical lens having one or two substantially plate-shaped cylindrical lenses having circular arc-shaped concave lens surfaces 152A, 172A, and 173A and arc-shaped concave lens surfaces 152B, 172B, and 173B capable of transmitting light on the incident side. 152, 172, and 173, the line light having a wide angle of 180 ° or more can be emitted.

  In addition, since the beam splitter 18 is used, the single laser light source 14 can emit three line lights. Further, since the laser light source 14 emits green laser light having a wavelength of 532 nm, the visibility of the user can be improved.

  Next, the flow of the laser beam emitted from the laser light source 14 will be described based on FIG. 1, FIG. 2, FIG. 5, and FIG. As shown in FIG. 2, the laser beam 14A emitted from the laser light source 14 enters the first half mirror 18B. A part of the laser beam 14A incident on the first half mirror 18B passes through the first half mirror 18B and enters the horizontal wide-angle lens unit 15.

  As shown in FIG. 6, the laser beam 14 </ b> A incident from the concave lens surface 152 </ b> B on the incident side of the second cylindrical lens 152 in the horizontal wide-angle lens unit 15 is emitted with a wide angle from the concave lens surface 152 </ b> A on the emission side. Line light that passes through the through-hole 153a, enters from the concave lens surface 151B on the incident side of the first cylindrical lens 151, is further emitted from the convex lens surface 151A on the emission side, and is widened to approximately 140 °. Is emitted.

  However, the width of the horizontal irradiation window 4b (FIG. 2) in the direction in which the line light is widened is narrower than the width of the line light widened to 140 ° and is emitted from the horizontal irradiation window 4b to the outside of the housing 4. Line light is limited to about 100 °. With this configuration, the vertical wide-angle lens unit 16 and the horizontal wide-angle lens unit 15 have the same configuration, and the line light from the horizontal irradiation window 4b is widened to 100 °, as will be described later. The line light from the vertical irradiation window 4c (FIG. 2) can be widened to 140 °. For this reason, as mentioned above, the cost concerning the laser marking device 1 can be reduced.

  On the other hand, the remaining part of the laser beam 14A incident on the first half mirror 18B is reflected upward by the first half mirror 18B and incident on the second half mirror 18C. A part of the laser beam 14A incident on the second half mirror 18C is reflected by the second half mirror 18C in a direction that forms an angle of approximately 30 ° with respect to the second half mirror 18C, and enters the vertical wide-angle lens unit 16. To do.

  Similarly to the laser beam 14A incident on the horizontal wide-angle lens unit 15, the laser beam 14A incident on the vertical wide-angle lens unit 16 is incident from the concave lens surface on the incident side of the second cylindrical lens (not shown) of the vertical wide-angle lens unit 16. Later, the light is emitted from the exit-side concave lens with a wide angle, passes through the through hole of the spacer (not shown), enters from the concave lens surface on the entrance side of the first cylindrical lens (not shown), and further widens from the convex lens on the exit side. 2 is converted into line light having a spread of 140 ° (range indicated by a two-dot chain line in FIG. 2) in the same plane as the paper surface of FIG. 2, and is emitted through the vertical irradiation window 4c.

  The remaining laser beam 14 </ b> A passes through the second half mirror 18 </ b> C and enters the wide-angle ceiling lens unit 17. As shown in FIG. 5, the laser beam 14A incident from the concave lens surface 173B on the incident side of the second sub-cylindrical lens 173 in the ceiling wide-angle lens unit 17 is widened and emitted from the concave lens 173A on the emission side. The incident side concave lens surface 172B of the one sub-cylindrical lens 172 is incident, exited from the exit side concave lens 172A with a wide angle, incident from the incident side concave lens surface 171B of the first cylindrical lens 171, and the exit side convex lens surface 171A. 1 is converted into line light having a spread of 220 ° (range indicated by a two-dot chain line in FIG. 1) in the same plane as the paper surface of FIG. 1, and the line light is transmitted through the ceiling. The light is emitted to the outside of the housing 4 through the window dust cover 8.

The laser marking device of the present invention is not limited to the above-described embodiment, and various modifications and improvements can be made within the scope described in the claims. For example, the shapes of the spacers 153 provided in the horizontal wide-angle lens unit 15 and the vertical wide-angle lens unit 16 are not limited to those in the present embodiment.

  For example, the thickness L is adjusted according to the desired wide angle degree of the line light to be widened. By reducing L, the degree of wide angle increases. As shown in FIG. 7, without the spacer, the outer surface on the incident side of the first cylindrical lens 151 ′ and the portion other than the lens surface 151B ′ and the outer surface on the output side of the second cylindrical lens 152 ′ and the lens surface By arranging the portions other than 152A ′ in contact with each other and setting L to 0, the line light can be widened to 180 ° or more.

  Further, the dimensions and materials of the first cylindrical lens, the second cylindrical lens, the first sub-cylindrical lens, and the second sub-cylindrical lens are not limited to the configuration of the present embodiment. What is necessary is just to adjust according to the desired degree of the wide angle of the line light which is going to widen.

1 is a front sectional view of a laser ink dispenser including a horizontal wide-angle lens part, a vertical wide-angle lens part, and a ceiling wide-angle lens part that are wide-angle lenses according to an embodiment of the present invention. 1 is a side sectional view of a laser ink dispenser including a horizontal wide-angle lens part, a vertical wide-angle lens part, and a ceiling wide-angle lens part that are wide-angle lenses according to an embodiment of the present invention. 1 is a side view of a laser ink dispenser including a horizontal wide-angle lens part, a vertical wide-angle lens part, and a ceiling wide-angle lens part that are wide-angle lenses according to an embodiment of the present invention. 1 is an upper cross-sectional view of a laser ink dispenser including a horizontal wide-angle lens part, a vertical wide-angle lens part, and a ceiling wide-angle lens part that are wide-angle lenses according to an embodiment of the present invention. The side sectional view showing the ceiling wide-angle lens part which is the wide-angle lens of the laser marking device according to the embodiment of the present invention. FIG. 3 is an upper cross-sectional view showing a horizontal wide-angle lens portion which is a wide-angle lens of the laser ink drawing device according to the embodiment of the present invention. The upper cross section figure which shows the modification of the horizontal wide-angle lens part which is a wide-angle lens of the laser marking device by embodiment of this invention, and a vertical wide-angle lens part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 17 ... Wide-angle lens part 15 ... Horizontal wide-angle lens part 15A ... Most incident side 15B ... Outmost side 16 ... Vertical wide-angle lens part 17 ... Wide-angle lens part 17A ... Most incident side 17B ... Most exit side 151 ... First cylindrical lens 151A ... Convex lens surface 151B ... Concave lens surface 152 ... Second cylindrical lenses 152A, 152B ... Concave lens surface 171 ... First cylindrical lens 171A ... convex lens surface 171B ... concave lens surface 172 ... first sub cylindrical lens 172A, 172B ... concave lens surface 173 ... second sub cylindrical lens 173A, 173B ... concave lens surface

Claims (2)

A plurality of cylindrical lenses having a most incident side and a most emitting side, and arranged in a direction connecting the most incident side and the most emitting side, each having an incident side and an emitting side; a wide-angle lens for emitting linear light from the outermost emission side with respect to the input from,
A laser light source comprising a laser light source capable of emitting a laser beam to the wide-angle lens ,
The plurality of cylindrical lenses are arranged at the position of the outermost emission side, and have an arc-shaped convex lens surface capable of transmitting light on the emission side, and an arc-shaped concave lens surface capable of transmitting light on the incident side. A first cylindrical lens and an arc-shaped concave lens surface that is disposed closer to the most incident side than the first cylindrical lens and has an arc-shaped concave lens surface that can transmit light on the exit side, and can transmit light on the incident side. A second cylindrical lens having at least one cylindrical lens having a concave lens surface having a shape;
A portion of the outer surface of the first cylindrical lens other than the convex lens surface on the emission side and the concave lens surface on the incident side is a rough surface,
The outer surface of the second cylindrical lens, the concave lens surface on the exit side, and the portion other than the concave lens surface on the incident side are rough surfaces,
The laser marker which, characterized in that in contact with each other with the first cylindrical a part portion consisting rough surface of the outer surface of the lens and the second part is a by part consisting of rough surface of the outer surface of the cylindrical lens Outer . The second cylindrical lens includes a first sub-cylindrical lens having an arc-shaped concave lens surface capable of transmitting light on the exit side and an arc-shaped concave lens surface capable of transmitting light on the incident side, and light on the exit side. Two cylindrical lenses having a circular arc-shaped concave lens surface capable of transmitting light and a second sub-cylindrical lens having a circular arc-shaped concave lens surface capable of transmitting light on the incident side are the most incident side and the most incident side. Are stacked in the direction connecting
The outer surface of the first sub-cylindrical lens, the concave lens surface on the emission side, and the portion other than the concave lens surface on the incident side are rough surfaces,
The outer surface of the second cylindrical lens, the concave lens surface on the exit side, and the portion other than the concave lens surface on the incident side are rough surfaces,
A portion of the outer surface of the first sub-cylindrical lens that is a rough surface and a portion of the outer surface of the second sub-cylindrical lens that is a rough surface are in contact with each other. The laser marking device according to claim 1.

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