JP2008122110A - Laser marker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser marker capable of simply and highly precisely adjusting the line light. <P>SOLUTION: The laser marker is provided with a lens barrel 5, a laser light source provided therein, a beam splitter for splitting the laser beam emitted from the laser light source, a deflection lens supported by the lens barrel rotatably and adjusting the light path of the laser beam split by the beam splitter, and a lens holder 24 for holding the conversion lens 23 for converting the laser beam into a line light 29. Therein, at the end of the lens barrel 5, the wall member (recessed groove) holding a first adjusting member 17 in which a through hole for passing the laser beam is provided, and a first position adjusting means (adjusting screw) 27 of the first adjusting member 17 for adjusting the position on the wall member (recessed groove). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laser marking device that performs marking by converting a laser beam emitted from a laser light source into line light and irradiating it.

  As a conventional laser marking device, one having a lens that splits a laser beam emitted from one laser light source into a plurality of laser beams by a beam splitter having a half mirror and converts it into line light is known. (For example, refer to Patent Document 1).

  In such a laser marking device, a second flange having a through hole through which a laser beam passes is pivotally supported at the tip of the first flange so as to be rotatable with respect to the first flange. Then, an eccentric screw which is a rotation adjusting means is screwed into a screw hole provided in the first flange via a U groove formed in the second flange, and the second flange is rotated by rotating the eccentric screw. The rotation is adjusted with respect to the first flange. When the second flange is rotationally adjusted in this way, the second flange is fixed to the first flange with a screw.

A lens holder that houses a rod lens that is a conversion lens is connected to the second flange by a pin. A compression spring and an adjustment screw, which are elastic means, are arranged between the lens holder and the second flange in a direction perpendicular to the pin, and the lens holder is configured to swing in the front-rear direction of the laser beam by the advancement and retraction of the adjustment screw. ing. Here, the rod lens was attached to a V-groove formed at the tip of the lens holder, pressed by the holder, and fixed with a screw.
JP 2006-047107 A

  However, the conventional laser marking device has a problem that the position adjustment of the line conversion lens and the orthogonal adjustment of the horizontal line light and the vertical line light are troublesome.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a laser marking device capable of adjusting line light easily and with high accuracy.

  In order to achieve the above object, a first aspect of the present invention includes a lens barrel supported by a vertical mechanism, a laser light source provided in the lens barrel, and a beam splitter that divides a laser beam emitted from the laser light source. And a declination lens that is rotatably supported by the lens barrel and that adjusts the optical path of the laser beam branched by the beam splitter, and a lens holder that holds a conversion lens that converts the laser beam into line light. In the laser marking device, a wall member holding a first adjustment member in which a through-hole through which a laser beam passes is formed at an end of the barrel, and a position of the first adjustment member is adjusted to the wall member The first position adjusting means is provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the wall member is constituted by a concave groove, and the first adjustment member is fitted into the concave groove so as to be rotatable around the optical path of the laser beam, The position of the first adjusting member can be adjusted by the first position adjusting means.

  According to a third aspect of the present invention, in the second aspect of the present invention, the wall member is formed as a concave groove, and the first adjustment member is fitted in the concave groove so as to be rotatable around the optical path of the laser beam. A gap is provided between the first inner diameter part of the concave groove and the first inner diameter part of the first adjustment member, and the first adjustment member is moved in and out of the first position adjustment means so that the first adjustment member is centered on the optical path of the laser beam. As described above, the position is adjusted by rotating within the gap.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, at least two of the first position adjusting means are provided.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the first adjustment member is provided with a fixing means for fixing the first adjustment member to the lens barrel from the direction in which the laser beam passes. To do.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the position of the second adjustment member in which the through-hole through which the laser beam passes is formed is perpendicular to the passing direction of the laser beam. It is possible to adjust the center of the round pin by a second position adjusting means connected to the first adjusting member via a round pin arranged in the center.

  According to the first aspect of the present invention, the line light can be adjusted easily and with high accuracy by adjusting the position of the first adjusting member held by the wall member by the first position adjusting means.

  According to the second aspect of the present invention, the position of the first adjusting member is adjusted by rotating the first adjusting member around the optical path of the laser beam in the concave groove that is the wall member. The line light can be adjusted easily and with high accuracy.

  According to invention of Claim 3, in order to adjust the position of a 1st adjustment member by the clearance gap formed between the ditch | groove which is a wall member, and the 1st adjustment member, the position of this 1st adjustment member is adjusted. Fine adjustment can be performed to adjust the line light easily and with high accuracy.

  According to the fourth aspect of the present invention, since at least two first position adjusting means are provided, the position of the first adjusting member can be finely adjusted to adjust the line light easily and with high accuracy.

  According to the fifth aspect of the present invention, the first adjustment member whose rotation angle is adjusted can be fixed to the lens barrel by the fixing means, so that a product with higher accuracy can be obtained.

  According to the invention described in claim 6, since the position of the second adjusting member can be adjusted by the second adjusting means with the round pin arranged in the direction orthogonal to the laser beam passing direction as the center, 2 orthogonal to each other. Two line lights can be adjusted easily and with high accuracy.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a cutaway side view of a laser marking device according to the present invention, FIG. 2 is an enlarged detail view of a portion A in FIG. 1, FIG. 3 is a view in the direction of arrow A in FIG. 5 is a cross-sectional view taken along the line CC of FIG. 2, FIG. 6 is an explanatory view of the lens barrel concave groove seen from FIG. 3, and FIG. 7 is an explanatory diagram of the lens barrel concave groove seen from FIG. 8 is a top view of FIG. 1 showing the laser beam optical path branched by the beam splitter, and FIG. 9 is a partially enlarged view of FIG. 1 showing the laser beam optical path branched by the beam splitter.

  In the laser marking device shown in FIG. 1, a rotatable base 2 is provided on a stand 1, and a frame 3 is erected on the base 2. A gimbal mechanism 4 constituting a vertical mechanism is disposed on the frame 3, and a lens barrel 5 is suspended vertically on the gimbal mechanism 4. The lens barrel 5 is supported vertically in the vertical direction. A laser light source 6 is provided.

  A beam splitter 8 (see FIG. 9) that branches the laser beam 7 emitted from the laser light source 6 into a plurality of laser beams 11 and 12 is fixed inside the lens barrel 5. As shown in FIG. 9, the beam splitter 8 branches the laser beam 7 incident from the laser light source 6 in the orthogonal direction (horizontal laser beam 11) and the straight traveling direction by the first half mirror 9. Then, the laser beam 7 branched in the straight direction is branched obliquely upward (vertical laser beam 12) by the second half mirror 10.

  Thus, the laser beams 11 and 12 branched to each pass through the declination lens 14 (see FIGS. 1, 2 and 4) whose traveling direction can be changed minutely. The declination lens 14 is a wedge-shaped cylindrical lens, and is fixed to the inside of a sleeve 15 having a threaded portion on the outer periphery with an adhesive or the like. The sleeve 15 is screwed to the exit of the lens barrel 5. Yes. Here, the sleeve 15 is fixed to the exit port of the lens barrel 5 by a nut 16 which is a fixing means after the adjustment of the declination lens 14 described later is finished. Note that the fixing means of the sleeve 15 is not limited to the nut 16, and fixing means using an adhesive or the like may be used, and rotation may be prevented by pins or the like that engage with both members.

  Next, as shown in FIGS. 6 and 7, a cylindrical portion formed in a cylindrical shape with respect to the optical axes of the laser beams 11 and 12 is provided at an end portion for fixing the declination lens 14 of the lens barrel 5. A concave groove 25 is formed as a wall member made of a straight portion symmetrically formed linearly from the cylindrical portion, and a first through hole having a diameter substantially equal to or slightly larger than the beam diameter of the laser beams 11 and 12 is formed. An adjustment member 17 (see FIGS. 2, 4, and 5) is rotatably fitted and supported in the concave groove 25 of the lens barrel 5. Here, the first adjustment member 17 includes a circular portion that is fitted to the cylindrical portion of the concave groove 25 and a linear portion that is fitted to the linear portion of the concave groove 25. The outer diameter of the circular portion of the first adjustment member 17 is set to be equal to or slightly smaller than the inner diameter portion 26 of the cylindrical portion of the concave groove 25, and the first adjustment member 17 is formed of the concave groove 25 of the lens barrel 5. It is fitted to the bottom surface 33 and provided so as to be rotatable with respect to the optical axes of the laser beams 11 and 12. A gap is formed between the side surface of the straight portion of the first adjustment member 17 and the inner surface of the straight portion of the groove 25.

  Further, as shown in FIGS. 3 and 5, the lens barrel 5 has a direction perpendicular to the direction in which the laser beams 11 and 12 pass and is away from the center of the groove 25 (laser beam passage hole), That is, the adjustment screw 27 as the first position adjusting means is screwed into the linear part of the concave groove 25, and the rotation angle of the first adjustment member 17 can be finely adjusted by the advancement and retraction of the adjustment screw 27. Has been. Accordingly, the first adjusting member 17 is moved in the circumferential direction by the gap formed between the first adjusting member and the linear portion of the concave groove 25 by the forward and backward movement of the adjusting screw 27 provided in the linear portion of the concave groove 25. Therefore, the rotation angle can be finely adjusted. Since the inner diameter of the cylindrical portion of the concave groove 25 and the outer diameter of the circular portion of the first adjustment member 17 are substantially the same size, the first adjustment member 17 does not move in the front-rear and left-right directions, and the adjustment screw 27 moves forward and backward. To rotate in the circumferential direction. Then, the first adjustment member 17 whose rotation angle is finely adjusted is fixed to the lens barrel 5 with a fixing screw 28 from the direction in which the laser beams 11 and 12 pass.

  Further, a second adjusting member 19 having a through hole substantially equal to or slightly larger than the beam diameter is disposed outside the first adjusting member 17 through which the laser beams 11 and 12 pass. As shown in FIG. 5, a round pin 20 having an axial center is provided between the first adjustment member 17 and the second adjustment member 19 so as to be in a direction perpendicular to the optical path of the laser beams 11 and 12, A V-groove 21 (see FIG. 2) for positioning the round pin 20 is formed in a portion where the round pin 20 of the first adjustment member 17 and the second adjustment member 19 is in contact with the first adjustment member 17. The second adjustment member 19 is connected by adjustment screws 22 (see FIGS. 2 and 3) provided at two locations outside the axis of the round pin 20 in a direction orthogonal to the optical path of the laser beams 11 and 12. The second adjusting portion is moved forward and backward by the adjusting screw 22 19 is the angle rotated about the axis of the round pin 20 is finely adjusted, the second adjustment member 19 the angle is finely adjusted is fixed in place.

  As shown in FIGS. 2 to 4, a lens holder 24 is attached to the second adjustment member 19 with two fixing screws 28, and the laser beams 11 and 12 are horizontally mounted on the lens holder 24, respectively. A conversion lens 23 for converting the light into vertical line lights 29 and 30 (see FIG. 16) is held.

  By the way, as shown in FIG. 1, the lens barrel 5 suspended on the gimbal mechanism 4 is provided with a weight 31 and a braking device 32 for braking.

  Next, a method for adjusting the line lights 29 and 30 in the laser marking device configured as described above will be described below with reference to FIGS.

  10 is a diagram for explaining angle correction of a laser beam by a declination lens, FIG. 11 is a diagram for explaining a method for adjusting a horizontal laser beam, FIG. 12 is a diagram for explaining a method for adjusting a vertical laser beam, and FIG. FIGS. 14A to 14C are diagrams for explaining a method of adjusting the tilt angle of line light, FIG. 14 is a view (plan view) in the direction of arrow E in FIG. 13A, and FIG. 15 is a line FF in FIG. Sectional drawing and FIG. 16 are explanatory drawings of line light.

  Line light that can be irradiated by the laser marking device shown in FIG. 1 includes horizontal line light 29 shown in FIG. 16 and vertical line light 30 orthogonal to the horizontal line light 29.

  As shown in FIGS. 8 and 9, the laser beam 7 emitted from the laser light source 6 has errors δ1 to δ3 at the emission position with respect to the incident position due to variations in the accuracy of parts such as the laser light source 6 and the beam splitter 8. Or angular errors θ1 to θ3 occur. In order to correct such an error, the declination lens 14 shown in FIG. 10 is provided, and the sleeve 15 to which the declination lens 14 through which the laser beams 11 and 12 branched by the beam spiriter 8 pass is rotated. By doing so, errors in the laser beams 11 and 12 can be corrected. The wedge angle θd of the declination lens 14 is about 1 to 1.5 °, but is not limited to this value.

  FIG. 11 and FIG. 12 show the adjustment positions where the laser beams 11 and 12 branched by the beam spiriter 8 are adjusted by the declination lens 14. This adjustment is performed in a state where the first adjustment member 17, the second adjustment member 19, the conversion lens 23, and the like are not attached, and is confirmed at the irradiation positions of the laser beams 11 and 12 emitted from the declination lens 14.

  FIG. 11 shows a method for adjusting the horizontal laser beam 11. When the declination lens 14 is rotated, the horizontal laser beam 11 rotates along a locus 01. In the case of horizontal, it is adjusted to x1 or x2 point on the horizontal reference line as a reference. If the horizontal laser beam 11 is not on the horizontal reference line, the converted horizontal line light 29 becomes a line light that falls forward or forward, and the angle α2 shown in FIG. 16 is not a right angle.

  FIG. 10 shows a method for adjusting the vertical laser beam 12. When the declination lens 14 is rotated, the vertical laser beam 12 rotates along a locus 02. In the case of vertical, it is adjusted to the point y1 or y2 on the vertical reference line as a reference. If the vertical laser beam 12 is not on the vertical reference line, the angle α2 shown in FIG. 14 formed by the converted vertical line light 30 with respect to the horizontal line light 29 is not a right angle.

  After adjusting the laser beams 11 and 12 using the declination lens 14 as described above, the second adjustment member 19 is roughly fixed to the first adjustment member 17 via the round pin 20 using the adjustment screw 22. A lens holder 24 that holds the line conversion lens 23 is fixed to the second adjustment member 19, the first adjustment member 17 is inserted into the concave groove 25 of the lens barrel 5, and the first adjustment member 17 is inserted into the laser beams 11 and 12. The horizontal line light 29 is adjusted by rotating with respect to the optical axis.

  That is, from the state shown in FIG. 13 (a), as shown in FIG. 13 (b), one (upper in the figure) adjustment screw 27 is advanced in the arrow direction, and the other (lower in the figure) adjustment screw 27 is moved in the arrow direction. The horizontal line light 29 is rotated counterclockwise from the chain line position and adjusted to the solid line position. Conversely, from the state shown in FIG. 13 (a), as shown in FIG. 13 (c), one (upper in the figure) adjustment screw 27 is retracted in the direction of the arrow, and the other (lower in the figure) adjustment screw 27 is moved. When advanced in the direction of the arrow, the horizontal line light 29 is rotated clockwise from the chain line position and adjusted to the solid line position.

  As described above, when the horizontal line light 29 is rotated to the left side (counterclockwise) as viewed from the line irradiation side as shown in FIG. 13B, the left side is lower than the lens center and the right side is increased. Conversely, as shown in FIG. 13 (c), when the lens is rotated to the right (clockwise), the left side is higher than the lens center, and the right side is lower. The same applies to the vertical line light 30.

  The above adjustment is performed by finely adjusting the rotation angle of the first adjustment member 17 by taking in and out the adjustment screw 27 provided in the lens barrel 5. Then, after the angle adjustment of the first adjustment member 17 is performed, the first adjustment member 17 is fixed to the lens barrel 5 by the fixing screw 28.

  Next, the second adjusting member 19 starts from the axial center of the round pin 20 by inserting and removing two adjusting screws 22 arranged on both sides of the round pin 20 connecting the first adjusting member 17 and the second adjusting member 19. Is rotated to finely adjust the angle of the second adjustment member 19.

  When the second adjustment member 19 is rotated to the right with respect to the axis when viewed from the side and the line irradiation side, the horizontal line light 29 is curved in a U shape as viewed from the line irradiation side, and conversely rotates to the left. In this case, it is bent in an inverted U shape when viewed from the line irradiation side. The same applies to the vertical line light 30.

  By the method described above, the horizontal line 29 is adjusted to be horizontal (straight line) with respect to the ground axis, and the vertical line light 30 is adjusted to be vertical (straight line) with respect to the ground axis.

It is a fractured side view of the laser marking device according to the present invention. It is the A section enlarged detail drawing of FIG. It is a figure of the arrow A direction of FIG. It is the DD sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is explanatory drawing of the lens-barrel groove | channel seen from FIG. It is explanatory drawing of the lens-barrel groove | channel seen from FIG. It is a top view of FIG. 1 which shows the laser beam optical path branched by the beam splitter. It is the elements on larger scale of FIG. 1 which shows the laser beam optical path branched by the beam splitter. It is a figure explaining angle correction of a laser beam by a declination lens. It is a figure explaining the adjustment method of a horizontal laser beam. It is a figure explaining the adjustment method of a vertical laser beam. (A)-(c) is a figure explaining the adjustment method of the inclination-angle of line light. It is a figure (top view) of the arrow E direction of Fig.13 (a). It is the FF sectional view taken on the line of FIG. It is explanatory drawing of line light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stand 2 Base 3 Frame 4 Gimbal mechanism 5 Lens barrel 6 Laser light source 7 Laser beam 8 Beam splitter 9 First half mirror 10 Second half mirror 11 Horizontal laser beam 12 Vertical laser beam 14 Deflection lens 15 Sleeve 16 Nut 17 First Adjustment member 19 Second adjustment member 20 Round pin 21 V groove 22 Adjustment screw 23 Conversion lens 24 Lens holder 25 Concave groove 26 Concave groove inner diameter part 27 Adjustment screw 28 Fixing screw 29 Horizontal line light 30 Vertical line light 31 Balance weight 32 Brake device 33 Bottom of the inner diameter of the groove

Claims (6)

A lens barrel supported by a vertical mechanism, a laser light source provided in the lens barrel, a beam splitter that divides a laser beam emitted from the laser light source, and a beam that is rotatably supported by the lens barrel. In a laser marking device including a declination lens that adjusts an optical path of a laser beam branched by a splitter, and a lens holder that holds a conversion lens that converts the laser beam into line light,
A wall member for holding a first adjustment member in which a through-hole through which a laser beam passes is formed at an end of the lens barrel; and a first position adjustment unit for adjusting the position of the first adjustment member on the wall member. A laser marking device characterized by being provided.   The wall member is constituted by a groove, the first adjustment member is fitted in the groove so as to be rotatable around the optical path of the laser beam, and the position of the first adjustment member is adjusted by the first position adjusting means. 2. The laser marking device according to claim 1, wherein the marking is possible.   The wall member is constituted by a concave groove, and when the first adjustment member is fitted in the concave groove so as to be rotatable around the optical path of the laser beam, the first inner diameter portion of the concave groove and the first adjustment member A gap is provided between the first inner diameter portion and the position of the first adjustment member is adjusted by rotating the first adjustment member within the gap about the optical path of the laser beam by inserting and removing the first position adjustment means. 3. The laser marking device according to claim 2, wherein:   The laser marking device according to any one of claims 1 to 3, wherein at least two of the first position adjusting means are provided.   The laser marking device according to any one of claims 1 to 4, further comprising fixing means for fixing the first adjusting member to the lens barrel from a laser beam passing direction.   Second position adjusting means for connecting the position of the second adjusting member, in which the through-hole through which the laser beam passes, is connected to the first adjusting member via a round pin arranged in a direction orthogonal to the laser beam passing direction. The laser marking device according to any one of claims 1 to 5, wherein the laser marking device can be adjusted around the round pin.

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