JP2009208132A - Laser beam marking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laser beam marking device capable of easily adjusting the position of a workpiece, and recognizing the direction of deviation of the workpiece with respect to the focal position in an intuitive manner. <P>SOLUTION: The laser beam marking device comprises: a beam source for guide which emits the guide beam; a beam source for the visible beam spot which emits the spot beam at the angle inclined to the direction of the center axis of a converging lens and projects the first visible beam spot on a workpiece; and a galvano-scanner which emits the position index 51 and position information ("0", "5" or the like) on the workpiece with the guide beam when the workpiece position adjusting mode is selected and projects the workpiece pattern 53 and the device pattern 54 at the position according to the direction of deviation with respect to the focal position of the laser beam at the position corresponding to the position index 51. When the workpiece is moved in the direction of the center axis, the first visible beam spot is projected on the position index 51 corresponding to the position of the workpiece machining surface. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a laser marking device.

In a laser marking device that forms a print pattern of characters, symbols, figures, etc. on a workpiece with a laser beam, the position of the workpiece surface in the central axis direction of the converging lens that converges the laser beam, the workpiece material, and the printing depth In some cases, adjustment may be made according to printing conditions such as printing thickness.
Conventionally, a laser processing apparatus that teaches a position that satisfies a target printing condition by the intersection of visible light from two directions is known (see, for example, Patent Document 1). According to the conventional laser processing apparatus, if two indication images are visible on the workpiece, it is not the target position, and the operator moves the workpiece back and forth in the central axis direction of the converging lens, and the indication images overlap. It is possible to adjust the position to satisfy the target printing condition.
JP-A-2005-131668

  However, in the conventional laser processing apparatus, it is possible to intuitively recognize whether or not the instruction image is adjusted to a position corresponding to a certain printing purpose by looking at whether or not there is only one indication image, but the adjusted position. There is a problem that it is not possible to intuitively recognize how far and in what direction the position is shifted from the focal length.

  The present invention has been completed based on the above circumstances, and provides a laser marking device that allows easy adjustment of the position of a workpiece and allows the operator to intuitively recognize the position of the adjusted workpiece. The purpose is to do.

A first invention is a laser marking device that forms a print pattern of characters, symbols, figures, etc. on a workpiece with a laser beam, and converges a laser light source that emits laser light and the laser light emitted from the laser light source A converging lens, a guide light source that emits guide light, and a visible light spot that emits spot light at an angle inclined with respect to the central axis direction of the converging lens and projects a first visible light spot on the workpiece A light source for use, a position index corresponding to the position in the central axis direction, storage means for storing position information indicating the position corresponding to the position index, and a processing mode for forming a print pattern on the workpiece or the position of the workpiece Selecting means for selecting a workpiece position adjustment mode for adjusting the print mode, and when the processing mode is selected, forming a print pattern on the workpiece with the laser beam, When the work position adjustment mode is selected, a galvano scanner that projects the position index and the position information onto the work with the guide light, and the work moves in the central axis direction, The first visible light spot is projected on the position index corresponding to the position of the processed surface of the workpiece.
According to the present invention, since the position index corresponding to the position of the convergent lens in the central axis direction and the position information indicating the position corresponding to the position index are projected, the operator refers to the position information and responds to the printing purpose. The position index corresponding to the determined position is identified, and the workpiece is moved so that the first visible light spot is projected onto the identified position index, so that the workpiece is brought into a position corresponding to the printing purpose. Easy to adjust.
Further, according to the present invention, the operator can recognize the position corresponding to the position index on the work by projecting the position information, so the worker can intuitively recognize the position where the work is adjusted. . Therefore, according to the present invention, the position of the workpiece can be easily adjusted and the operator can intuitively recognize the position of the adjusted workpiece.

In the second invention, the galvano scanner projects, as the plurality of position indicators, a plurality of scales corresponding to mutually different positions in the central axis direction with the guide light.
According to the present invention, since a plurality of position indicators are projected on the workpiece as scales, when the printing purpose is changed, the workpiece is so indicated that the position indicator corresponding to the position corresponding to the changed printing purpose is indicated. It is sufficient to make adjustments, and readjustment is easy when the printing purpose changes.

According to a third aspect of the present invention, the storage means further stores a workpiece graphic representing a workpiece and a device graphic representing the laser marking device, and the galvano scanner is a focal position of the laser beam at a position corresponding to the position index. The workpiece graphic and the apparatus graphic are respectively projected at positions corresponding to the direction of deviation with respect to.
According to the present invention, since the workpiece graphic and the device graphic are respectively projected at positions corresponding to the deviation direction with respect to the focal position of the laser beam, the operator uses the position index based on the position where the workpiece graphic and the device graphic are projected. It can be intuitively recognized whether the corresponding position is shifted from the focal position in the direction of the workpiece side or the laser marking device side.

According to a fourth aspect of the present invention, the galvano scanner projects the workpiece graphic on the scale side corresponding to the position shifted to the workpiece side with reference to the scale corresponding to the focal position, and the laser marking device side The apparatus figure is projected on the scale side corresponding to the position shifted to.
According to the present invention, the operator can intuitively recognize that the scale corresponding to the focus position is closer to the work graphic side than the scale corresponding to the focal position, and that the position corresponding to the scale is shifted to the work side. As for the scales on the side, it can be intuitively recognized that the positions corresponding to the scales are shifted to the laser marking device side.

The fifth invention further includes position specifying means for specifying a position in the central axis direction, and the galvano scanner is configured to use the first visible light spot at the position specified by the position specifying means as the position index. The overlapping second visible light spot is projected with the guide light.
According to the present invention, since the two visible light spots overlap at the position specified by the position specifying means, the operator moves the work to a position where the two visible light spots overlap each other, thereby specifying the position of the work. It can be easily adjusted to the position. Furthermore, since only one position index is projected in the present invention, it is clear which position index should be adjusted, and there are few errors in work.

The sixth invention further comprises position specifying means for specifying a position in the central axis direction, and angle changing means for changing the angle of the spot light emitted from the visible light spot light source, wherein the galvano scanner is As the position index, a second visible light spot is projected on the workpiece with the guide light, and the angle changing means is configured to project the first visible light spot and the first light at a position designated by the position designation means. The angle of the spot light is changed so that the two visible light spots overlap.
According to the present invention, since the two visible light spots overlap at the position specified by the position specifying means, the operator moves the work to a position where the two visible light spots overlap each other, thereby specifying the position of the work. It can be easily adjusted to the position. Furthermore, since only one position index is projected in the present invention, it is clear which position index should be adjusted, and there are few errors in work.

In a seventh invention, the storage means further stores a workpiece graphic representing a workpiece and a device graphic representing the laser marking device, and the galvano scanner is a focal position of the laser beam at a position corresponding to the position index. The workpiece graphic and the apparatus graphic are respectively projected at positions corresponding to the direction of deviation with respect to.
According to the present invention, since the workpiece graphic and the device graphic are respectively projected at positions corresponding to the deviation direction with respect to the focal position of the laser beam, the operator uses the position index based on the position where the workpiece graphic and the device graphic are projected. It can be intuitively recognized whether the corresponding position is shifted from the focal position in the direction of the workpiece side or the laser marking device side.

In an eighth aspect of the invention, the galvano scanner projects a pointing graphic indicating a different position according to the shift direction, and the position indicated by the pointing graphic when the position corresponding to the position index is shifted to the workpiece side. The workpiece graphic is projected to the position indicated by the instruction graphic when the position corresponding to the position index is shifted to the laser marking device side.
According to the present invention, the operator can intuitively recognize that the position corresponding to the position index is shifted to the work side if the pointing graphic indicates the work graphic, and similarly, if the pointing graphic indicates the device graphic, the laser marking device It can be intuitively recognized that it is shifted to the side.

In a ninth invention, the storage means stores the position designated by the position designation means as the position information.
According to the present invention, since the designated position is stored as the position information, for example, even if the laser marking device is turned off, when the operator subsequently turns on the power, the designated position and its designation are stored. Intuitively know where it is.

In a tenth aspect, the galvano scanner projects at least one of a shift direction and a shift amount with respect to a focal position of the laser beam at a position corresponding to the position index as the position information.
When the deviation direction or deviation amount with respect to the focal position is projected, it is easy to predict the machining result at the position corresponding to the position index from the machining result at the focal position. Therefore, workability is good for the operator.

In an eleventh aspect of the invention, the galvano scanner is a figure showing the distance of the distance from the convergent lens to the position corresponding to the position index when compared with the distance from the convergent lens to the focal position as the shift direction. Project.
According to the present invention, it is easy for the operator to intuitively recognize whether the workpiece is adjusted to the side far from the converging lens or the workpiece is adjusted to the side close to the converging lens with reference to the focal position.

In a twelfth aspect, the galvano scanner projects a number indicating a distance from the focal position to a position corresponding to the position index as the shift amount.
According to the present invention, since the number indicating the distance is projected as the shift amount, the operator can recognize the shift amount more accurately.

  According to the present invention, it is easy to adjust the position of the workpiece, and the operator can intuitively recognize the position of the adjusted workpiece.

<Embodiment 1>
1. Configuration of laser marking device (1) Overall configuration

A first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram of a laser marking device 1 according to the present embodiment. The laser marking device 1 includes a laser unit 60 and a controller 50 that are arranged to face a workpiece W that is a printing target.

  The laser unit 60 includes a laser light source 10 that emits a laser beam L1 for printing, and a galvano mirror provided with a pair of galvanometer mirrors arranged in the optical path of the laser light L1 from the laser light source 10 to change the direction of the laser light L1. A scanner 20 (conceptually shown in FIG. 1) and a converging lens 22 (for example, an fθ lens) that converges the laser light L1 from the galvano scanner 20 and forms an irradiation point on the workpiece W are provided.

  The controller 50 provides an on / off signal to the laser light source 10 and a drive signal to the galvano scanner 20 based on a print pattern of characters, symbols, figures, and the like. Thereby, the galvano scanner 20 is driven and the laser beam L1 is irradiated so as to scan on the workpiece W, so that a desired figure or the like can be printed on the workpiece.

FIG. 2 is a schematic diagram for explaining the configuration of the laser marking device 1 in more detail.
The galvano scanner 20 includes a pair of galvanometer mirrors 21X and 21Y and drive motors 23X and 23Y that rotatably support the galvanometer mirrors 21X and 21Y.

The drive motor 23X is supported and fixed by a galvano mount (not shown) so that the rotation axis is substantially perpendicular to the XY plane on the print area where the workpiece W is arranged, and a galvano mirror 21X is attached to the tip of the rotation axis. Yes.
The drive motor 23Y is supported and fixed by a galvano mount (not shown) so that the rotation axis is substantially parallel to the XY plane and substantially orthogonal to the rotation axis of the drive motor 23X, and a galvano mirror 21Y is attached to the tip of the rotation shaft. It has been.

The converging lens 22 is composed of, for example, an fθ lens, and is provided between the galvano scanner 20 and the print area.
A laser light source 10 (for example, a carbon dioxide gas laser that is a gas laser, a YAG laser that is a fixed laser, a semiconductor laser, a fiber laser, or the like) emits laser light L1 to the galvano scanner 20 from a direction substantially parallel to the XY plane. The direction of the laser beam L1 emitted from the laser light source 10 is changed by the galvanometer mirror 21X and is incident on the galvanometer mirror 21Y. The laser beam L1 reflected by the galvanometer mirror 21Y passes through the converging lens 22 and is converged to the focal position. The laser beam L1 is imaged and irradiated on the surface of the workpiece W whose distance from the converging lens 22 is adjusted. Let the dots form.

  The light source 30 for guide is comprised by LED etc., and radiate | emits the visible guide light L2. The guide light source 30 is disposed with the optical axis directed to the optical path from the side of the optical path of the laser light L1 emitted from the laser light source 10. At a position where the optical path of the laser beam L1 and the guide beam L2 intersect, a reflection mirror 27 that reflects the guide beam L2 and guides the laser beam L1 in the same direction as the optical path direction toward the galvano scanner 20 is rotatably disposed. Has been.

  Specifically, one end side of the reflection mirror 27 is supported by a rotating shaft 28 and is rotated between the following two postures by operation of a lever (not shown) connected to the rotating shaft 28. One of the postures is that the guide light L2 from the guide light source 30 is reflected on the optical path of the laser light source 10, and the direction of the reflected light is changed in the same direction as the laser light L1, so that the galvano scanner 20 side. Is a reflection posture (illustrated by a solid line in FIG. 2). The other posture is a retracted posture deviated from the optical path of the laser beam L1 (illustrated by a two-dot chain line in the figure).

  The control unit 24 receives, for example, a signal corresponding to the rotation position of the reflection mirror 27, turns on the laser light source 10 and turns off the guide light source 30 when the reflection mirror 27 is in the retracted posture. On the other hand, when the reflecting mirror 27 is in the reflecting posture, the laser light source 10 is turned off and the guide light source 30 is turned on.

  The setting unit 25 (an example of a selection unit and a position designation unit) includes, for example, an operation switch. An operator can set print information related to a desired print pattern by the setting unit 25 and can set an operation mode of the laser marking device 1. Make a selection. The operation mode of the laser marking device 1 includes, for example, a processing mode for forming a print pattern on a work, a work position adjustment mode for adjusting the position of the work, and the like.

  The storage unit 26 (an example of a storage unit) is configured by a non-volatile storage medium such as a flash memory, a print pattern corresponding to print information set by a user, coordinate data for projecting a reference scale line, Coordinate data for projecting position information representing the position corresponding to each scale of the reference scale line, coordinate data for projecting a work graphic representing a workpiece, and a device graphic representing the laser marking device 1 Coordinate data is stored.

  FIG. 3 is a schematic diagram for explaining a light source for visible light spots. The visible light spot light source includes an LED 40, a reflection mirror 42, a converging lens 44, and the like. The spot light L <b> 3 emitted from the LED 40 is reflected by the reflection mirror 42, and a visible light spot (an example of “first visible light spot”) is projected onto the workpiece W via the converging lens 44. By projecting the spot light L3 at an angle inclined with respect to the central axis direction of the converging lens 22, the first visible light spot moves on the work W in accordance with the approach / separation of the work W with respect to the converging lens 22.

Next, the operation of the laser marking device 1 in the machining mode and the workpiece position adjustment mode will be described.
(Operation in machining mode)
When the processing mode is selected by the setting unit 25, the control unit 24 receives the print information set by the setting unit 25 and generates coordinate data based on the print pattern stored in the storage unit 26.

  Then, a drive signal corresponding to the coordinate data is given from the control unit 24 to the drive motors 23X and 23Y, and an on / off signal is given to the laser light source 10, whereby the X-axis and Y-axis galvanometer mirrors 21X and 21Y are rotated. The laser beam irradiation point is moved in a two-dimensional direction on the workpiece W, and the print pattern is printed.

(Operation in workpiece position adjustment mode)
When the workpiece position adjustment mode is selected by the setting unit 25, the control unit 24 reads the above-described coordinate data from the storage unit 26, and drives the galvanometer mirrors 21X and 21Y based on the read coordinate data to guide the light source 30. By scanning the guide light from the workpiece W on the workpiece W, control is performed so that the reference scale line, the position information, the workpiece graphic, and the device graphic are projected onto the workpiece W. Further, the control unit 24 turns on the LED 40 and projects a first visible light spot on the workpiece W as shown in FIG.

  FIG. 4 is a schematic diagram illustrating an example of a reference scale line, position information, a work graphic, and an apparatus graphic. The reference scale line 50 is a set of a plurality of scales 51 (an example of “position index”) corresponding to different positions in the central axis direction of the converging lens 22. The reference graduation line 50 is projected onto the work such that the first visible light spot that moves in accordance with the approach / separation of the work W with respect to the converging lens 22 indicates the scale corresponding to the current position of the work W.

  Specifically, the reference graduation line 50 is composed of a plurality of graduations 51 arranged along the moving direction of the first visible light spot and a reference line 52 extending in the moving direction. It corresponds. For example, if one scale corresponds to 1 mm, the scale interval is set so that the first visible light spot moves one scale when the work is moved 1 mm in the direction of the central axis.

  FIG. 5 is a schematic view of the processed surface of the workpiece W viewed from the V direction shown in FIG. In this case, the first visible light spot is located on the scale 51a (hereinafter referred to as “reference scale”) corresponding to the focal position. Here, the point P1 indicates the position of the first visible light spot. By switching to the machining mode in this state, printing can be performed by irradiating the workpiece W with the laser light L1 at the maximum energy density.

  FIG. 6 is a schematic diagram when the workpiece W is separated from the focal position by a predetermined distance in the direction of the central axis of the convergent lens 22. When the laser beam is irradiated at a distance different from the focal position depending on the printing conditions such as the material of the workpiece to be printed, the printing depth, the printing thickness, etc., the operator can use the central axis of the converging lens 22. The position of the processing surface of the workpiece W in the direction is adjusted. In this case, the focal position and the position of the work surface of the workpiece W are shifted, and the first visible light spot is moved to the position of the scale 51 corresponding to the shift amount. Point P2 indicates the position of the first visible light spot when the processing surface of the workpiece W is separated from the focal position by a predetermined distance.

  As shown in FIG. 4, in the vicinity of the reference scale line 50, the distance from the focal position to the position corresponding to each scale 51 is indicated so that the operator can recognize the position corresponding to each scale 51. Numbers (an example of position information) are projected at predetermined intervals. In the case of the illustrated example, numbers such as “0” are projected onto the reference scale 51a, and numbers such as “5” are projected onto the fifth scale 51 from the reference scale 51a. The reason why “5” is displayed on the fifth scale 51 is that one scale is assumed to be 1 mm. A unit of distance such as “5 mm” may also be displayed.

Further, in the vicinity of the reference scale line 50, a work figure 53 for guiding the operator whether the position corresponding to each scale 51 is shifted from the focal position to the work W side or the laser marking device 1 side. And a device graphic 54 is projected.
More specifically, with reference to the position index 51a corresponding to the focal position, the workpiece figure 53 is projected to the position index 51 side corresponding to the position shifted to the workpiece W side, and shifted to the laser marking device 1 side. A device graphic 54 is projected on the position index 51 side corresponding to the position.
When the workpiece graphic 53 and the device graphic 54 are projected in this way, the operator places the position index 51 closer to the work graphic 53 than the position index 51a corresponding to the focal position. It can be intuitively recognized that the position is shifted to the W side. Similarly, regarding the position indexes 51 on the apparatus graphic 54 side, the positions corresponding to the position indexes 51 are intuitively shifted to the laser marking apparatus 1 side. Can be recognized.

  In addition, although arbitrary figures can be used as the workpiece | work figure 53 and the apparatus figure 54, it is desirable that it is a figure which an operator can associate with the workpiece | work W and the laser marking apparatus 1 easily.

  Further, the reference scale line 50 includes a convergence lens 22 when compared with the distance from the convergence lens 22 to the focal position so that the operator can recognize the shift direction of the position corresponding to the scale relative to the focal position. A figure indicating the distance from the position to the position corresponding to each scale is projected in the vicinity of the reference scale line 50. In the case of the illustrated example, the character “far” (an example of a graphic indicating perspective) on the side away from the converging lens 22 on the basis of the focal position, and the character “near” (perspective) on the side approaching the converging lens 22. An example of a figure showing) is displayed.

  For example, FIG. 6 shows a state in which the workpiece W is moved by 4 mm away from the focal position, and if one scale corresponds to 1 mm, as shown in FIG. The first visible light spot moves to the position P2 advanced by 4 scales. Thus, the operator can intuitively know the shift direction and shift amount of the work surface of the workpiece with respect to the focal position, such as “the position of the workpiece is shifted by 4 mm from the focal position in the separation direction”.

  According to the laser marking device 1 according to the embodiment of the present invention described above, a plurality of scales 51 corresponding to the position of the converging lens 22 in the central axis direction and position information representing positions corresponding to the scales 51 are projected. Therefore, the operator refers to the position information, specifies the scale 51 corresponding to the position according to the printing purpose, and focuses the work W on the convergent lens so that the first visible light spot is projected onto the specified scale 51. By moving in the direction of the central axis 22, the workpiece W can be easily adjusted to a position corresponding to the printing purpose.

  Furthermore, according to the laser marking device 1, the operator can recognize the position corresponding to the scale 51 by projecting positional information such as “0” and “5”, so that the operator can adjust the workpiece to any position. It can be recognized intuitively.

  Furthermore, according to the laser marking device 1, the workpiece graphic 53 and the device graphic 54 are respectively projected at positions corresponding to the scale 51 in accordance with the deviation direction with respect to the focal position of the laser light L1, so that the operator can Based on the position at which the device graphic 54 is projected, it can be intuitively recognized whether the position corresponding to the scale 51 is shifted from the focal position in the direction of the workpiece W side or the laser marking device 1 side.

  Further, according to the laser marking device 1, since a plurality of scales 51 are projected onto the workpiece W, when the printing purpose is changed, the scale corresponding to the position corresponding to the changed printing purpose is the first visible light. What is necessary is just to adjust the workpiece | work W to the position pointed to by the spot, and readjustment when a printing purpose changes is easy.

Further, according to the laser marking device 1, since the shift direction is indicated as "far" or "near", the workpiece is adjusted on the side far from the converging lens 22 based on the focal position, or on the side near the converging lens 22. The operator can intuitively recognize whether the workpiece is adjusted.
Furthermore, according to the laser marking device 1, since a number indicating the distance is projected as the amount of deviation, the operator can recognize the amount of deviation more accurately.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS.
FIG. 7 is a schematic diagram for explaining the operation of the laser marking device 2 according to the second embodiment. Here, only the configuration necessary for the explanation is shown for easy understanding. The configuration of the laser marking device 2 is substantially the same as the configuration of the laser marking device 1 according to the first embodiment. Here, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, when both the X-axis and Y-axis galvanometer mirrors 21X and 21Y have, for example, an inclination angle of 0 degree (inclination angle of the galvanomirror 21X indicated by a solid line in FIG. 7), the laser beam L1 reflected by them or The guide light L2 passes through the central axis of the convergent lens 22 and passes through the focal position (the origin of the XY coordinates on the print area).

As a result, as shown in the figure, in the “work position adjustment mode”, when both the galvanometer mirrors 21X and 21Y have an inclination angle of 0 degrees, for example, the guide light L2 from the guide light source 30 is focused on the focusing lens 22. A second visible light spot (an example of a “position index”) is projected onto the position P1.
The spot light L3 from the LED 40 projects a first visible light spot at the focal position P1 of the converging lens 22 when the work surface of the workpiece is at the focal position.

  Therefore, as shown in FIG. 7, when both the galvanometer mirrors 21X and 21Y have an inclination angle of 0 degrees, for example, the first visible light spot and the second visible light spot overlap at the focal position P1. Therefore, in the “work position adjustment mode”, when the operator wants to adjust the machining surface of the workpiece W to the focal position, the position of the workpiece W is adjusted so that two visible light spots overlap on the machining surface of the workpiece W. do it.

On the other hand, when the laser beam L1 is irradiated at a position different from the focal position depending on the printing conditions such as the material of the work W to be printed, the printing depth, the printing thickness, and the like, The position of the workpiece W in the direction of the central axis 22 is adjusted.
By the way, in this embodiment, since the position of the workpiece is adjusted so that two visible light spots overlap on the processing surface of the workpiece W, when the workpiece W is adjusted to a position according to the printing purpose, the position according to the printing purpose is adjusted. Therefore, it is necessary to make two visible light spots overlap. Therefore, in the present embodiment, when the operator operates the setting unit 25 and designates a position according to the printing purpose, the control unit 24 rotates the galvano mirror 21X so that two visible lights are located at the position according to the printing purpose. Control so that the spots overlap. This will be specifically described below.

FIG. 8 is a schematic diagram showing a screen 45 for the operator to specify a position according to the printing purpose. The screen 45 may have a configuration in which a monitor is provided in the setting unit 25 and displayed on the monitor, or a configuration in which a computer is connected to the laser marking device 2 and displayed on the monitor of the computer. On the screen 45, a position corresponding to the purpose of printing is designated by a deviation direction and a deviation amount from the focal position. In the illustrated example, the shift direction and shift amount are selected from options such as “Base”, “▽ 20.0”, and “Δ20.0”. Here, “Base” means a focal position. “▽ 20.0” means a position shifted by 20.0 mm from the focal position in a direction away from the converging lens 22 (separating direction), and “Δ20.0” means a converging lens from the focal position. This means a position shifted by 20.0 mm in a direction approaching 22 (approach direction).
When the operator specifies a position on the screen 45, the control unit 24 causes the storage unit 26 to store the specified position.

  FIG. 9 is a schematic diagram showing the relationship between the “shift direction and shift amount from the focal position” and the rotation angle of the galvano mirror 21X. For example, the rotation angle when “Base” is selected is 0 degree, and the rotation angle when “▽ 20.0” is selected is +10 degrees. The relationship between the “shift direction and shift amount from the focal position” and the rotation angle of the galvano mirror 21 </ b> X is stored in the storage unit 26. The “work distance” and “spot diameter” in the figure will be described later.

When the workpiece position adjustment mode is selected or when the operator respecifies the position on the screen 45, the control unit 24 reads the position designated by the worker from the storage unit 26, and stores the angle corresponding to the read position. Read from the unit 26 and rotate the galvanometer mirror 21X.
When the galvano mirror 21X rotates, as shown in FIG. 7, the point H where the guide light L2 and the spot light L3 intersect moves in the X-axis direction and moves up and down in the direction of the central axis of the converging lens 22. The rotation of the galvano mirror 21X stops at an angle at which the position in the central axis direction matches the position designated by the operator. Therefore, the operator can adjust the machining surface of the workpiece W to the designated position by adjusting the position of the workpiece W so that two visible light spots overlap on the machining surface of the workpiece W.

Next, a description will be given of how the operator can recognize the position index and the position corresponding to the position index in the second embodiment.
FIG. 10 is a schematic diagram showing a position index when the designated position is the focal position, and FIG. 11 is a schematic diagram showing the position index when “▽ 20.0” is designated as the position according to the printing purpose. It is. In any of the figures, it is assumed that the processing surface of the workpiece W indicated by the solid line is at the focal position.

A black circle 61 in FIG. 10 indicates the second visible light spot (position index) projected by the guide light L2 and the first visible light spot projected by the spot light L3. When the designated position is a focal position, two visible light spots overlap, so that only one visible light spot can be seen as shown.
A black circle 62 in FIG. 11 indicates the second visible light spot projected by the guide light L2, and a white circle 63 indicates the first visible light spot projected by the spot light L3. Although the processing surface of the workpiece W is still in the focal position, the control unit 24 rotates the galvanometer mirror 21X so that the two visible light spots overlap at the position “▽ 20.0” designated by the user. In FIG. 11, the first visible light spot 63 and the second visible light spot 62 do not overlap. In FIG. 11, a work W ′ indicated by a broken line indicates the work W after being moved in the central axis direction so that the machining surface coincides with “▽ 20.0”. When the operator moves the processing surface of the workpiece W to the position “▽ 20.0”, the two visible light spots overlap. In other words, the operator can adjust the processing surface of the workpiece W to the position “▽ 20.0” by moving the workpiece W to a position where the two visible light spots overlap.

  As described above, FIG. 11 shows an example in which the user designates “▽ 20.0” as a position corresponding to the printing purpose. In this case, “▽ 20.0” ( A character “example of position information” is also projected. Since the characters “▽ 20.0” are projected, the operator can recognize how much the currently designated position is deviated from the focal position in which direction.

Furthermore, in the present embodiment, it is determined whether the position corresponding to the second visible light spot (position index) is shifted from the focal position of the laser beam L1 to the workpiece W side or the laser marking device 2 side. 64 and the apparatus figure 65 are used to guide the operator.
Specifically, for example, in the present embodiment, as described above, a downward triangle “▽” (an example of a graphic indicating perspective) is projected when the focus position is shifted in the separation direction (work W side), and the focus position is Is projected in the approaching direction (laser marking device 2 side), the upward triangle “Δ” (an example of a graphic indicating perspective) is projected. Guidance is provided by pointing the figure 65 with an instruction figure.

  More specifically, as shown in FIG. 11, a device graphic 65 is projected above the instruction graphic 66 and a work graphic 64 is projected below the instruction graphic 66. When the work figure 64 and the apparatus figure 65 are projected in this manner, if the work figure 64 is shifted to the work W side, a downward triangle “▽” is projected, so that the operator is intuitive that the work figure is shifted to the work W side. Can be recognized. On the contrary, when it is shifted to the laser marking device 2 side, an upward triangle “Δ” is projected, so that the operator can intuitively recognize that it is shifted to the laser marking device 2 side.

Next, the “work distance” and “spot diameter” in FIG. 9 described above will be described.
In the second embodiment, the case where “position according to the printing purpose” is designated by the deviation direction and deviation amount from the focal position has been described as an example. Specifically, the case where “position according to the printing purpose” is selected from options such as “Base”, “「 20.0 ”,“ Δ20.0 ”has been described as an example. On the other hand, the “position corresponding to the printing purpose” may be selected from the distance from the convergent lens 22 (work distance), the printing purpose, and the like.

  For example, when “Base” is selected on the screen 45 shown in FIG. 8, the spot diameter (printing thickness) of the laser light L1 is processed at 100 μm, and the distance from the converging lens 22 at that time is 180 mm. Suppose there is a relationship. It is assumed that “▽ 20.0” and “Δ20.0” have the same relationship. In this case, instead of selecting the shift direction and shift amount from the focal position, “work distance” or “spot diameter” may be selected. This is because it may be easier for the operator to select the “work distance” or “spot diameter”.

  According to the laser marking device 2 according to the second embodiment of the present invention described above, the two visible light spots overlap at the position designated on the screen 45, so the operator designates the position corresponding to the printing purpose and designates the two visible light spots. By moving the workpiece to the position where the light spot overlaps, the position of the workpiece can be easily adjusted to the position according to the printing purpose, and characters such as “Base” and “▽ 20.0” are displayed. Therefore, the operator can intuitively recognize the currently designated position and whether or not the workpiece W is adjusted to the designated position. Therefore, workability is good for the worker.

Further, according to the laser marking device 2, since only one position index is projected, it is clear which position index should be adjusted, and there are few work errors.
Further, according to the laser marking device 2, if the instruction graphic 66 points to the workpiece graphic 64, the operator can intuitively recognize that the position corresponding to the position index is shifted to the workpiece W side. If it points, it can recognize intuitively that it has shifted | deviated to the laser marking apparatus 2 side.
Further, since the position designated by the operator is stored in the nonvolatile storage unit 26 in the laser marking device 2, the current setting is performed even when the operator shuts off the power of the laser marking device 2 and then turns on the power. It is possible to easily recognize the position.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG.
FIG. 12 is a schematic diagram for explaining the operation of the laser marking device 3 according to the third embodiment, and here, only the configuration necessary for the explanation is shown for easy understanding. The configuration of the laser marking device 3 is substantially the same as the configuration of the laser marking device 2 according to the second embodiment except that an angle changing unit that changes the angle of the spot light emitted from the visible light spot light source is provided. It is. Here, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

In the present embodiment, angle changing means for changing the angle of the reflection mirror 42 is provided. In the present embodiment, when the operator operates the setting unit 25 to designate a position according to the printing purpose, the control unit 24 does not rotate the galvano mirror 21X, but controls the angle changing means to reflect the reflecting mirror 42. And the angle of the spot light is changed so that the two visible light spots overlap at a position corresponding to the purpose of printing.
For this reason, in the third embodiment, not the relationship between the “shift direction and shift amount from the focal position” and the rotation angle of the galvanometer mirror 21X, but “the shift direction and shift amount from the focus position” and the rotation of the reflection mirror 42. The relationship with the angle is stored in the storage unit 26.
The third embodiment is substantially the same as the second embodiment in other points.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG.
FIG. 13 is a schematic diagram of an example in which the position of the workpiece W is specified using a dial type switch whose selection value changes according to the rotation angle.
In the second embodiment, the case where the deviation direction and the deviation amount are designated on the screen 45 has been described as an example. However, the designation method is not limited to this, and the designation is performed using a dial as shown in FIG. May be. In the dial shown in FIG. 13, for example, when the volume value is set to 0, “focal position” is selected as the position corresponding to the printing purpose.

  In the second embodiment, symbols and numbers such as “Base”, “▽ 20.0”, and “Δ20.0” are used so that the operator can recognize the direction and amount of deviation from the focal position. Although the case of projecting in association with the position index has been described as an example, any figure can be projected as long as the operator can recognize the displacement direction and the displacement amount. For example, in the example shown in FIG. 13, the character “± 0” is associated with the “focus position”, and the character “± 0” is displayed on the work W in the vicinity of the second visible light spot. become. “+2” is a volume value corresponding to “▽ 20.0” described above, and “−2” is a volume value corresponding to “Δ20.0” described above. When these are selected, the characters “+2” and “−2” are displayed.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

(1) In the first embodiment, the characters “far” and “near” are described as examples of the graphic indicating perspective, but an arbitrary shape can be used as the graphic indicating perspective.

However, it is desirable that the operator can intuitively recognize whether the figure indicates “far” or “near”.
For example, a figure 81 shown in FIG. 14 is a figure in which the vertices of two triangles face each other, and it can be said that “near” is easily recognized intuitively. A figure 82 shown in FIG. 14 is a figure in which the vertices of two triangles are opposite to each other, and it can be said that “far” is easily recognized intuitively.
Further, for example, the symbol 83 shown in FIG. 15 is “+ (plus)”, and can be said to be a figure that allows easy recognition of “far” intuitively. A symbol 83 shown in FIG. 15 is “− (minus)”, and it can be said that “near” is a figure that can be easily recognized intuitively.
In addition, for example, characters such as “separation” and “approach” may be used.

(2) In the first embodiment, the case where the intervals of the plurality of scales 51 constituting the reference scale line 50 are equally spaced has been described as an example, but the intervals of the scales 51 are not necessarily equal. For example, depending on the characteristics of the optical system including the converging lens 22, the distance corresponding to a certain distance may increase as the workpiece W moves away from the converging lens 22. In this case, it is necessary to set the scale 51 so that the interval increases as the distance from the reference scale 51a increases. That is, it is only necessary to recognize the current position of the workpiece W from the scale 51 indicated by the first visible light spot, and the intervals of the scale 51 are not necessarily equal.

(3) In the second embodiment, whether the position corresponding to the second visible light spot (position index) is shifted from the focal position of the laser light L1 to the workpiece W side or the laser marking device 2 side, Although the operator is guided by pointing the work graphic 64 or the device graphic 65 with the instruction graphic 66, it may be indicated by the position of the second visible light spot which side is shifted.

  FIG. 16 is a schematic diagram illustrating an example of pointing at the position of the second visible light spot 62. In the example shown in the figure, in the moving direction of the second visible light spot 62, each of the work surfaces of the workpiece W is adjusted to the focal position, and the opposite direction from the position projected by the second visible light spot 62, etc. A workpiece graphic 71 and a device graphic 72 are projected at positions separated by a distance. When projected in this way, when the first visible light spot 63 and the second visible light spot 62 overlap one, if the overlapping position is relatively close to the work figure 71, the second It can be recognized that the position corresponding to the visible light spot 62 is shifted to the workpiece W side. Conversely, if the position is close to the apparatus figure 72, the position corresponding to the second visible light spot 62 is shifted to the laser marking apparatus side. Can be recognized.

The schematic diagram of the laser marking apparatus which concerns on one Embodiment of this invention. The more detailed schematic diagram of the laser marking apparatus which concerns on one Embodiment of this invention. The schematic diagram of the light source for visible light spots which concerns on one Embodiment of this invention. The schematic diagram of the scale which concerns on one Embodiment of this invention. The schematic diagram of the visible light spot which concerns on one Embodiment of this invention. The schematic diagram of the visible light spot which concerns on one Embodiment of this invention. The schematic diagram of the laser marking apparatus which concerns on one Embodiment of this invention. The schematic diagram of the screen which concerns on one Embodiment of this invention. The schematic diagram which shows the relationship between the shift | offset | difference direction and deviation | shift amount, and rotation angle which concern on one Embodiment of this invention. The schematic diagram of the position parameter | index which concerns on one Embodiment of this invention. The schematic diagram of the position parameter | index which concerns on one Embodiment of this invention. The schematic diagram of the laser marking apparatus which concerns on one Embodiment of this invention. The schematic diagram of the position designation | designated means which concerns on one Embodiment of this invention. The schematic diagram of the figure which concerns on one Embodiment of this invention. The schematic diagram of the figure which concerns on one Embodiment of this invention. The schematic diagram of the position parameter | index which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Laser marking apparatus 2 ... Laser marking apparatus 3 ... Laser marking apparatus 10 ... Laser light source 20 ... Galvano scanner 22 ... Converging lens 24 ... Control part 25 ... Setting Part (selection means, position designation means)
26: Storage unit (storage means)
30 ... Guide light source 40 ... LED (light source for visible light spot)
42 ... Reflection mirror (light source for visible light spot)
44 ... Converging lens (light source for visible light spot)
51 ... Scale (position index)
53 ... Work figure 54 ... Device figure 62 ... Second visible light spot (position index)
63 ... 1st visible light spot 64 ... Work figure 65 ... Device figure 66 ... Instruction figure L1 ... Laser light L2 ... Guide light L3 ... Spot light P1 ... Focus position W ... Workpiece

Claims (12)

A laser marking device that forms a print pattern of characters, symbols, figures, etc. on a workpiece with laser light,
A laser light source for emitting laser light;
A converging lens for converging the laser light emitted from the laser light source;
A light source for guide that emits guide light;
A visible light spot light source that emits spot light at an angle inclined with respect to the central axis direction of the convergent lens and projects a first visible light spot on the workpiece;
Storage means for storing a position index corresponding to the position in the central axis direction, and position information representing a position corresponding to the position index;
Selecting means for selecting a processing mode for forming a print pattern on the workpiece or a workpiece position adjustment mode for adjusting the position of the workpiece;
When the processing mode is selected, a print pattern is formed on the workpiece with the laser beam, and when the workpiece position adjustment mode is selected, the position index and the position information are formed on the workpiece with the guide beam. A galvano scanner that projects
With
A laser marking device in which the first visible light spot is projected onto the position index corresponding to the position of the processed surface of the workpiece as the workpiece moves in the central axis direction.   2. The laser marking device according to claim 1, wherein the galvano scanner projects, as the plurality of position indicators, a plurality of scales corresponding to different positions in the central axis direction with the guide light. The storage means further stores a workpiece graphic representing a workpiece and a device graphic representing the laser marking device,
The laser marking apparatus according to claim 2, wherein the galvano scanner projects the workpiece graphic and the apparatus graphic at positions corresponding to a shift direction of the position corresponding to the position index with respect to a focal position of the laser light.   The galvano scanner projects the work figure on the scale side corresponding to the position shifted to the workpiece side with the scale corresponding to the focal position as a reference, and the position is shifted to the laser marking device side. The laser marking device according to claim 3, wherein the device graphic is projected onto the corresponding scale side. Further comprising position specifying means for specifying a position in the central axis direction;
2. The laser marking according to claim 1, wherein the galvano scanner projects, as the position index, a second visible light spot that overlaps the first visible light spot at the position designated by the position designation unit with the guide light. apparatus. Position specifying means for specifying a position in the central axis direction;
Angle changing means for changing the angle of the spot light emitted from the visible light spot light source,
The galvano scanner projects a second visible light spot on the workpiece with the guide light as the position index,
The angle changing means changes the angle of the spot light so that the first visible light spot and the second visible light spot overlap at a position specified by the position specifying means. Laser marking device. The storage means further stores a workpiece graphic representing a workpiece and a device graphic representing the laser marking device,
7. The laser marking according to claim 5, wherein the galvano scanner projects the workpiece graphic and the apparatus graphic at positions corresponding to a shift direction of a position corresponding to the position index with respect to a focal position of the laser light. apparatus.   The galvano scanner projects an instruction graphic indicating a different position according to the displacement direction, and projects the work graphic at a position indicated by the instruction graphic when a position corresponding to the position index is shifted to the workpiece side. The laser marking apparatus according to claim 7, wherein the apparatus graphic is projected to a position indicated by the instruction graphic when a position corresponding to the position index is shifted toward the laser marking apparatus.   The laser marking device according to any one of claims 5 to 8, wherein the storage unit stores the position specified by the position specifying unit as the position information.   The galvano scanner projects at least one of a shift direction and a shift amount with respect to a focal position of the laser beam at a position corresponding to the position index as the position information. The laser marking apparatus as described.   The galvano scanner projects, as the shift direction, a figure indicating the distance of the distance from the convergent lens to the position corresponding to the position index when compared with the distance from the convergent lens to the focal position. The laser marking device described in 1. The laser marking device according to claim 10 or 11, wherein the galvano scanner projects a number indicating a distance from the focal position to a position corresponding to the position index as the shift amount.

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