JP5817120B2 - Laser drawing device - Google Patents

Description

  The present invention relates to a technique for drawing a character or the like with a laser beam on a medium that develops color by heat.

  Use labels that can be colored by heat (such as rewritable media that can be used repeatedly after being erased, and write-once media that can only be written once) as labels for containers that move on the belt conveyor. There is a laser drawing apparatus that draws characters and the like by irradiating the label with laser light and partially heating the label.

  This type of laser drawing apparatus includes a mechanism for deflecting laser light emitted from the laser apparatus by a movable mirror driven by a control motor.

  In conventional laser drawing devices, when drawing characters etc. on thermal rewritable media etc. by heating with laser light, there is an “inner phenomenon” in which the movement control of the laser light is not in time at the sharp curve part and it turns around the inside of the curve. There was a problem that occurred. This is due to the fact that the movement cannot catch up as the moving speed increases due to the integral action due to the inertia of the control motor or the movable mirror, and the radius of the curve becomes smaller at the curve portion. As a result, the print quality is degraded.

  FIG. 1 shows an example in which the characters “Pa” are drawn. In the semi-turbid point portion indicated by P1 and the looping portion indicated by P2, what should ideally be indicated by a broken line is caused by an inner phenomenon. It collapses as shown by the solid line.

  On the other hand, Patent Document 1 discloses a laser marking device that includes a delay unit that delays the timing at which coordinate data is supplied to a galvano scanner, thereby enabling a high-speed marking while suppressing a decrease in print quality due to an internal phenomenon. Yes. However, it is not preferable to control the timing at which the coordinate data is given because the control process is complicated. It is preferable that the control process can be dealt with by changing only the drawing command.

  The present invention has been proposed in view of the above-described conventional problems. An object of the present invention is to provide a laser drawing apparatus including a laser device that emits laser light and a movable mirror that deflects the laser light. This is to prevent deterioration of print quality due to the phenomenon.

In order to solve the above problems, in the present invention, a laser device that emits laser light, a movable mirror that deflects the laser light, and a drawing that defines a drawing shape by a connection of a plurality of line segments or curves Detecting means for detecting a bent portion in which an angle formed by connecting continuous line segments or curved lines is larger than a predetermined angle from the data; and the continuous forming the bent portion detected by the detecting means. An adjustment means for reducing the moving speed of the irradiation position of the laser beam in a drawing command for each line segment or curve to be drawn, and driving the movable mirror based on the drawing command, and the laser and a irradiating means for irradiating light to the drawing object, the detecting means, the line or curve is drawn the continuous form, the continuously constructed angle angle The laser drawing apparatus sum of supplementary is detected to be bent portion when the threshold is exceeded are the gist.

A method of controlling a laser drawing apparatus comprising a laser device that emits laser light and a movable mirror that deflects the laser light, wherein the drawing data defines a shape to be drawn by connecting a plurality of line segments or curves From the step of detecting a bent portion in which the angle formed by a continuous line segment or curved line connection is larger than a predetermined angle, and forming the bent portion detected by the detecting step A step of reducing the moving speed of the irradiation position of the laser beam in a drawing command for each line segment or curve to be drawn, and driving the movable mirror based on the drawing command; and a step of irradiating the drawing object, the detecting step, by line or curve is drawn the continuous, the angle between the continuously constructed angle Can be the sum of the square is configured as a laser marking control method for detecting that the flexion portion when the threshold is exceeded.

Further, a control program of a laser drawing apparatus including a laser device that emits laser light and a movable mirror that deflects the laser light, and a computer that forms a control unit of the laser drawing apparatus has a shape to be drawn Means for detecting a bent portion in which an angle formed by continuously connecting line segments or curved lines is larger than a predetermined angle from drawing data defined by a plurality of line segments or curved line connections; Means for reducing the moving speed of the irradiation position of the laser beam in the drawing command for each line segment or curve of the continuously drawn line segments or curves forming the detected bent portion, based on the drawing command, drives the movable mirror, to function as a means for irradiating the laser beam on the drawing object, said means for detecting is a continuously drawing The line or curve is, it is possible to sum of the supplementary angles formed by the continuously formed angle is configured as a laser marking control program to detect that the bent portion when the threshold is exceeded.

  In the laser drawing apparatus of the present invention, a sharp curve portion is automatically detected, a drawing command in which the moving speed of the laser beam is adjusted is generated in real time, and the speed of the laser beam is controlled according to the drawing command. By drawing slowly and accurately on the sharp curve portion, it is possible to prevent deterioration in print quality due to the inward turning phenomenon.

It is a figure which shows the example of an inner loop phenomenon. It is a figure which shows the structural example of the laser drawing apparatus concerning one Embodiment of this invention. It is a figure which shows the structural example of a whole control apparatus. It is a figure which shows the example of a software function structure of a whole control apparatus. It is a figure which shows the example of a structure of the input data to a drawing command production | generation part. It is a figure which shows the example of a structure of the output data from a drawing command production | generation part. It is explanatory drawing of the method A. FIG. 10 is an explanatory diagram of a method B. FIG. 10 is an explanatory diagram of a method C. FIG. 10 is an explanatory diagram of a method D. FIG. It is a flowchart which shows the process example of embodiment. 12 is a flowchart illustrating a processing example of “generate a drawing command”. It is a flowchart which shows the process example of "determining whether a sharp curve is included in the attention line segment group."

  Hereinafter, preferred embodiments of the present invention will be described.

<Configuration>
FIG. 2 is a diagram illustrating a configuration example of the laser drawing apparatus 1 according to the embodiment of the present invention. Although a thermal rewritable medium will be described as an example of a drawing target medium, the present invention can also be applied to a write-once medium that cannot be rewritten, such as thermal paper.

  In FIG. 2, the laser drawing apparatus 1 includes an overall control apparatus 11 that controls the entire apparatus, and a laser irradiation unit 12 that irradiates laser light. The laser irradiation unit 12 also includes a laser oscillator (laser device) 13 that generates laser light, a spot diameter adjustment lens 14 that adjusts the spot diameter of the laser light (adjusts the spot diameter to increase), and laser light irradiation. A direction control mirror (movable mirror) 15 that changes the direction, a direction control motor 16 that drives the direction control mirror 15, and a focal length adjustment that converges the laser light whose direction has been changed by the direction control mirror 15 on the thermal rewritable medium 2. And a lens 17.

  The laser oscillator 13 is generally a semiconductor laser (LD (Laser Diode)), but may be a gas laser oscillator, a solid-state laser oscillator, a liquid laser oscillator, or the like. The direction control motor 16 is, for example, a servo motor that controls the direction of the reflecting surface of the direction control mirror 15 to two axes. The direction control motor 16 and the direction control mirror 15 constitute a galvano mirror.

  The thermal rewritable medium 2 forms a film in a state in which, for example, the leuco dye and the developer are separated, and is rapidly cooled by applying heat at a predetermined temperature Ta to form a color by combining the leuco dye and the developer. When a predetermined temperature Tb lower than the temperature Ta is applied, the medium is decolored by returning to a state where the leuco dye and the developer are separated, for example, rewritable heat-sensitive paper.

  FIG. 3 is a diagram illustrating a configuration example of the overall control device 11. Here, a hardware configuration in the case where the overall control apparatus 11 is mainly implemented by software is shown, and a computer is an entity. When the overall control apparatus 11 is realized without using a computer as an entity, an IC manufactured for a specific function such as an ASIC (Application Specific Integrated Circuit) is used.

  The overall control device 11 includes a CPU 111, a memory 112, a storage device 113, an input device 114, a display 115, a CD / DVD drive 116, and a network device 117. In a storage device 113 such as a hard disk drive, a font data DB 1131 that stores font data of a series of characters such as stroke fonts and outline fonts, and a drawing command that eliminates duplication from the font data are generated and the laser irradiation unit 12 (FIG. 2). A character drawing program 1132 for controlling is stored.

  The CPU 111 reads and executes the character drawing program 1132 from the storage device 113, and draws characters on the thermal rewritable medium 2 in the procedure described later. The memory 112 is a volatile memory such as a DRAM and serves as a work area when the CPU 111 executes the character drawing program 1132. The input device 114 is a device for a user to input an instruction to control the laser irradiation unit 12 such as a mouse or a keyboard. The display 115 is a user interface that displays a GUI (Graphical User Interface) screen with a predetermined resolution and number of colors based on screen information instructed by the character drawing program 1132, for example. For example, an input field for characters to be drawn on the thermal rewritable medium 2 is displayed.

  The CD / DVD drive 116 is configured to be detachable from the CD / DVD 31, reads data from the CD / DVD 31, and writes data. The font data DB 1131 and the character drawing program 1132 are distributed in a state stored in the CD / DVD 31, read from the CD / DVD 31, and installed in the storage device 113. In addition, the CD / DVD 31 can be replaced with a non-volatile memory such as a Blu-ray disc, an SD card, a Memory Stick (registered trademark), a multimedia card, or an xD card.

The network device 117 is an interface (for example, an Ethernet (registered trademark) card) for connecting to a network such as a LAN or the Internet, and executes processing according to protocols defined in the physical layer and data link layer of the OSI basic reference model. Thus, a drawing command corresponding to the character code can be transmitted to the laser irradiation unit 12. The font data DB 1131 and the character drawing program 1132 can be downloaded from a predetermined server connected via a network. Note that the general control device 11 and the laser irradiation unit 12 may be directly connected via USB (Universal Serial Bus), IEEE 1394, wireless USB, Bluetooth (registered trademark), or the like, not via a network.

  Characters to be drawn drawn on the thermal rewritable medium 2 are stored in the storage device 113 in a list form, for example, or input from the input device 114. The character is specified by a character code such as UNICODE or JIS code, and the overall control device 11 reads out the font data of the character corresponding to the character code from the font data DB 1131 and converts it into a drawing command, whereby the laser irradiation unit 12 is controlled. Control.

  FIG. 4 is a diagram showing a software function configuration example of the overall control device 11.

  In FIG. 4, the overall control device 11 includes a drawing command generation unit 1111 and a drawing command execution unit 1114. The drawing command generation unit 1111 includes a sharp curve detection unit 1112 and a drawing command adjustment unit 1113.

  The drawing command generation unit 1111 has a function of generating a drawing command (laser control data) that can be interpreted and executed by the drawing command execution unit 1114.

  The steep curve detecting unit 1112 has a function of detecting that a steep curve (bent portion) is included in drawing data that defines a shape to be drawn by a plurality of line segments or curve connections.

  The drawing command adjusting unit 1113 has a function of generating a drawing command in which the moving speed and irradiation power of the laser beam are adjusted for the detected sharp curve portion.

  The drawing command execution unit 1114 has a function of interpreting and executing a drawing command generated by the CPU 111.

  FIG. 5 is a diagram illustrating a structure example of input data to the drawing command generation unit 1111. As shown in FIG. 5A, the input data includes items such as “drawing element array”, “threshold value (angle)”, “threshold value (length)”, “number of target line segments”, “speed adjustment coefficient”, “power adjustment coefficient”, and the like. Is included. The “drawing element array” is an array of drawing elements (information). The “threshold value (angle)” is an angle that defines a limit for determining a sharp curve when the accumulated angle exceeds this value. The “threshold value (length)” is a length that defines a limit for determining a stroke having a stroke length smaller than this value as a “short stroke”. The “target line segment” is a number that defines a limit to be removed from the processing target in order from the front when the number of line segments being processed exceeds this number. The “speed adjustment coefficient” is a coefficient for adjusting the moving speed of the laser in the sharp curve portion. The “power adjustment coefficient” is a coefficient for adjusting the laser power of the sharp curve portion.

As shown in FIG. 5B, the individual drawing elements included in the “drawing element array” are “drawing element type”, “starting point X coordinate”, “starting point Y coordinate”, “ending point X coordinate”, “ending point Y coordinate”, “ Items such as “control point X coordinate” and “control point Y coordinate” are included. Note that the serial number of the line segment group and the total number of line segments belonging to the line segment group are added before the first drawing element of the line segment group.
The “drawing element type” is information indicating whether the drawing element is a straight line or a curve. The “start point X coordinate” is the X coordinate of the start point of the drawing element. The “start point Y coordinate” is the Y coordinate of the start point of the drawing element. The “end point X coordinate” is the X coordinate of the end point of the drawing element. The “end point Y coordinate” is the Y coordinate of the end point of the drawing element. The “control point X coordinate” is the X coordinate of the control point of the curve. The “control point Y coordinate” is the Y coordinate of the control point of the curve.

  FIG. 6 is a diagram illustrating a structure example of output data from the drawing command generation unit 1111. As shown in FIG. 6A, the output data includes a “rendering command array” that is a rendering command group serving as input data to the rendering command execution unit 1114.

  As shown in FIG. 6B, each drawing command included in the “drawing command array” includes “X coordinate after movement”, “Y coordinate after movement”, “Laser on / off”, “Laser moving speed”, “Laser irradiation power”. Etc. ". The “post-movement X coordinate” is an X coordinate to which the laser light is moved. “Y-coordinate after movement” is the Y-coordinate to which the laser light is moved. “Laser on / off” is information on whether or not to emit laser light. “Laser moving speed” is a speed at which the laser light is moved. “Laser irradiation power” is the power of laser light.

<Steep curve detection method>
In the following, the case where the bent portion is configured with a line segment (straight line) will be described. However, when the bent portion is configured with a curve, the same processing is performed after pre-processing for approximating the curve with a straight line. be able to.

  Method A: A sharp curve is considered when the sum of complementary angles of adjacent line segments exceeds a threshold value. This is the basis for steep curve detection.

FIG. 7 (a) shows an example of method A,
If θ1 + θ2 + θ3> threshold, it is determined that the curve is a sharp curve.

  When the sharp curve continues as shown in FIG. 7B, if the threshold value is exceeded in the middle of accumulating the complementary angle, it is regarded as a sharp curve, the process is interrupted, and the process is restarted. This is because when all are summed, the accumulated complementary angle is canceled out by the reverse curve, and the total angle becomes small, making it impossible to detect the sharp curve.

  Method B: The length of the line segment to be processed is limited to a certain length. That is, only a short line segment is processed. In Method A, all the line segments are processed, so there is a performance loss. However, since the line segments of the sharp curve portions that require adjustment are short, the calculation of the portions that are not sharp curves is reduced, and the processing speed is reduced. Can be raised.

  FIG. 8A shows a sharp curve composed of three or more long line segments. However, since the distance between the line segments is large and no inward phenomenon occurs, there is no need for adjustment.

  FIG. 8 (b) shows a sharp curve composed of two long line segments, but there is no need for adjustment because no inward turning phenomenon occurs.

  Method C: One or both long line segments before or after the short line segment are included in the processing target. Method B may not be able to detect when a long line segment is part of a sharp curve, but it can be detected by including one or both long line segments before or after the short line segment as a processing target. Even when the line segment and the next short line segment are the start (end) of the sharp curve, the sharp curve can be detected.

  FIG. 9 shows a case where a long line segment before and after a short line segment is a part of a sharp curve, but a sharp curve can be detected by considering an angle with the long line segment before and after.

  Method D: Limits the number of line segments to be processed within a certain size. In methods A, B, and C, a large arc may be determined to be a sharp curve, but by limiting the number of line segments to be processed within a certain size, a large circle (arc) or the like is sharpened. The detection accuracy can be improved by avoiding the judgment of a curve.

  In FIG. 10A, a short line segment is curved with a large radius, and if it is simply accumulated, it will be judged as a sharp curve exceeding the threshold, but if the number of line segments is limited, each angle will be Since it is small, the sum of angles does not exceed the threshold.

  In FIG. 10B, a short line segment is curved with a small radius, and the sum of the angles is large even with a small number of line segments, so that it is determined as a sharp curve.

  The effective combination of the above methods is as follows.

    A: This is the basis for steep curve detection.

    A + B: Processing speed is faster than A alone.

    A + D: The detection accuracy is higher than that of A alone.

A + B + C: The detection accuracy is higher than that of A + B. A + B + D: The detection accuracy is higher than that of A + B.

    A + B + C + D: The detection accuracy is further improved as compared with A + B + C.

  Note that A + C and A + C + D are not present because C is premised on B.

<Operation>
FIG. 11 is a flowchart showing a processing example of the above embodiment.

  In FIG. 11, when the process is started (step S101), the drawing command generation unit 1111 (FIG. 4) of the overall control apparatus 11 generates a drawing command (step S102). In this process, the drawing command generation unit 1111 detects a sharp curve and adjusts to a sharp curve portion. Details of the processing will be described later.

  Next, the drawing command execution unit 1114 interprets and executes the drawing command generated by the drawing command generation unit 1111 (step S103). That is, drawing is performed by controlling the laser beam.

  Then, the process ends (step S104).

  FIG. 12 is a flowchart showing a processing example of “generate a drawing command” (step S102 in FIG. 11).

  In FIG. 12, when the process of “generating a drawing command” is started (step S111), the drawing command generating unit 1111 replaces the curved line with an approximate line segment if the character or figure to be drawn is composed of a curved line. (Step S112).

  Next, the drawing command generation unit 1111 sets the first line segment group as the target line segment group (step S113). That is, the serial number of the line segment group that identifies the line segment group of interest is recorded in the internally managed storage area.

  Next, the drawing command generation unit 1111 determines whether or not the line segment group has ended (step S114). That is, the determination is made based on whether all line segments included in the drawing element array have been processed.

  When it is determined that the line segment group has not ended (No in step S114), the drawing command generation unit 1111 determines whether or not the line segment group of interest includes a sharp curve by using the sharp curve detection unit 1112 (step S115). ). Details of the processing will be described later.

  Next, the drawing command generation unit 1111 branches the process depending on whether or not the sharp line group includes a sharp curve based on the detection result of the sharp curve detection unit 1112 (step S116).

  When the attention line segment group includes a sharp curve (Yes in step S116), the drawing command generation unit 1111 uses the drawing command adjustment unit 1113 to increase the speed with respect to the normal value held internally for the sharp curve portion. A drawing command in which the laser moving speed and the laser irradiation power are corrected by the adjustment coefficient and the power adjustment coefficient is generated (step S117).

  Next, the drawing command generation unit 1111 generates a drawing command at a normal laser moving speed and laser irradiation power for a portion that is not a sharp curve (step S118).

  When the attention line segment group does not include a sharp curve (No in step S116), the drawing command generation unit 1111 generates a drawing command with the normal laser moving speed and laser irradiation power for the entire attention line segment group. (Step S119).

  Next, the drawing command generation unit 1111 sets the next line segment group as the target line segment group (step S120), and returns to the determination of whether or not the line segment group has ended (step S114).

  If it is determined that the line segment group has been completed (Yes in step S114), the process ends (step S121).

  FIG. 13 is a flowchart showing a processing example of “determining whether or not a sharp curve is included in the group of lines of interest” (step S115 in FIG. 12). In addition, although the case where the above-described methods A to D are applied will be described, when a specific method is not used, a corresponding process may be removed.

  In FIG. 13, when the process of “determining whether the attention line segment group includes a sharp curve” is started (step S131), the sharp curve detection unit 1112 searches for a short line segment from the line segment group (step S132). . Whether it is a short line segment can be determined from the X coordinate and Y coordinate of the line segment.

  Next, the sharp curve detection unit 1112 branches the process depending on whether or not a short line segment is found (step S133).

  When the short line segment is found (Yes in step S133), the sharp curve detection unit 1112 sets the found short line segment as the attention line segment (step S134). When including a long line segment before and after the process, the line segment before the found short line segment group is set as the target line segment. That is, the line segment number for identifying the line segment of interest is recorded in the storage area managed internally.

  Next, the sharp curve detection unit 1112 determines whether or not the line segment group has ended (step S135).

  When it is determined that the line segment group has not ended (No in step S135), the sharp curve detection unit 1112 subsequently determines whether the short line segment has ended, that is, whether the short line segment has been connected to the long line segment. Is determined (step S136). When including the previous and subsequent long line segments in the process, the end of the line segment group is determined after the process of the next line segment after the last short line segment is completed.

  When it is determined that the short line segment has not been completed (No in step S136), the sharp curve detecting unit 1112 obtains the complementary angle of the angle formed by the line segment of interest and the next line segment (step S137). The complementary angle can be calculated from the X and Y coordinates of the two line segments.

  Next, the sharp curve detection unit 1112 stores the obtained complementary angle in the internal storage area, and discards the oldest complementary angle when the number of storages exceeds (the number of line segments to be processed minus 1) (step) S138).

  Next, the sharp curve detection unit 1112 obtains the sum of the complementary angles stored in the storage area (step S139).

  Next, the sharp curve detection unit 1112 determines whether or not the sum of the complementary angles exceeds the threshold value (step S140).

  When it is determined that the sum of the complementary angles does not exceed the threshold value (No in step S140), the sharp curve detection unit 1112 sets the next line segment as the attention line segment (step S141), and determines whether the line segment group has ended. The process returns to the determination (step S135).

  When it is determined that the sum of the complementary angles exceeds the threshold value (Yes in step S140), a result that a sharp curve is included is output, and the process ends (step S142).

  If a short line segment is not found (No in step S133) and if it is determined that the line segment group has ended (Yes in step S135), a result indicating that no sharp curve is included is output, and the process ends ( Step S143).

<Summary>
As described above, the present embodiment has the following advantages.
(1) Automatically detects a sharp curve part, generates a drawing command that adjusts the moving speed of the laser beam in real time, controls the speed of the laser beam according to the drawing command, and slowly turns the sharp curve part accurately Thus, it is possible to prevent a decrease in print quality due to the inner ring phenomenon.
(2) Although the "inner circle phenomenon" can be prevented by reducing the speed at the sharply curved part, the thermal rewritable media, etc. may be deteriorated due to heat storage at the sharply curved part, but the moving speed of the laser light irradiation position By adjusting the power of the laser beam in conjunction with this, it is possible to prevent media deterioration.
(3) When the sum of the complementary angles of the angles formed by two adjacent line segments or curves exceeds a threshold value, the sharp curve portion can be detected effectively by considering it as a sharp curve.
(4) Since only the line segment or the curve having a length shorter than the predetermined length is set as a determination target, it is possible to reduce the calculation of a portion that is not a sharp curve and increase the processing speed.
(5) By using one or both long line segments or curves before or after the short line segment or curve as the object of judgment, the long line segment and the next short line segment are the beginning (end) of the sharp curve. Even if it is, a sharp curve can be detected.
(6) By limiting the number of line segments or curves to be judged, it is possible to prevent a large circle (arc) or the like from being judged as a sharp curve and improve the detection accuracy.

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to the embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

DESCRIPTION OF SYMBOLS 1 Laser drawing apparatus 11 Overall control apparatus 111 CPU
1111 Drawing Command Generation Unit 1112 Steep Curve Detection Unit 1113 Drawing Command Adjustment Unit 1114 Drawing Command Execution Unit 112 Memory 113 Storage Device 1131 Font Data DB
1132 Character Drawing Program 114 Input Device 115 Display 116 CD / DVD Drive 117 Network Device 12 Laser Irradiation Unit 13 Laser Oscillator 14 Spot Diameter Adjustment Lens 15 Direction Control Mirror 16 Direction Control Motor 17 Focal Length Adjustment Lens 2 Thermal Rewritable Media 31 CD / DVD

JP 2002-292482 A

Claims (7)

A laser device for emitting laser light;
A movable mirror for deflecting the laser beam;
Detecting means for detecting a bent portion in which an angle formed by a continuously drawn line segment or curve connection is larger than a predetermined angle from drawing data defining a shape to be drawn by a plurality of line segments or curve connections; ,
Adjusting means for reducing a moving speed of the irradiation position of the laser beam in a drawing command for each line segment or curve of the continuously drawn line segments or curves forming the bent portion detected by the detecting means;
Based on the drawing command, the movable mirror is driven, and an irradiation means for irradiating the drawing target with the laser beam ,
The detecting means detects a bent portion when the sum of complementary angles of continuously formed angles exceeds a threshold by the continuously drawn line segments or curves. > A laser drawing apparatus characterized by that. The laser drawing apparatus according to claim 1,
The laser drawing apparatus characterized in that the adjusting means adjusts the power of the laser light in conjunction with the moving speed of the irradiation position of the laser light. In the laser drawing apparatus according to claim 1 or 2 ,
The laser writing apparatus according to claim 1, wherein the detection unit is configured to determine only a continuously drawn line segment or curve whose length is shorter than a predetermined length. The laser drawing apparatus according to claim 3 .
The detection means uses a long line segment or curve continuously drawn before or after the continuously drawn line segment or curve shorter than the specified length, or both, or a target for determination. A laser drawing apparatus. In the laser drawing apparatus according to any one of claims 1 to 4 ,
The laser drawing apparatus, wherein the detection means limits the number of line segments or curves drawn continuously as a reference for determination. A method for controlling a laser drawing apparatus comprising: a laser device that emits laser light; and a movable mirror that deflects the laser light,
A step of detecting a bent portion in which an angle formed by a continuously drawn line segment or curve connection is larger than a predetermined angle from drawing data defining a shape to be drawn by a plurality of line segments or curve connections;
Reducing the moving speed of the irradiation position of the laser beam in a drawing command for each line segment or curve of the continuously drawn line segments or curves forming the bent portion detected by the detecting step;
Driving the movable mirror based on the drawing command, and irradiating the drawing object with the laser beam ,
The detecting step detects a bent portion when a sum of complementary angles of continuously formed angles exceeds a threshold by the continuously drawn line segments or curves. A laser drawing control method characterized by the above. A laser writing apparatus control program comprising a laser device that emits laser light and a movable mirror that deflects the laser light,
A computer constituting a control unit of the laser drawing apparatus;
Means for detecting a bent portion in which an angle formed by a continuous line segment or curve connection is larger than a predetermined angle from drawing data defining a shape to be drawn by a plurality of line segments or curve connections;
Means for reducing a moving speed of the irradiation position of the laser beam in a drawing command for each line segment or curve of the continuously drawn line segments or curves forming the bent portion detected by the detecting means;
Based on the drawing command, the movable mirror is driven and functions as means for irradiating the drawing object with the laser beam ,
The detecting means detects a bent portion when a sum of complementary angles of continuously formed angles exceeds a threshold by the continuously drawn line segments or curves. /> Laser drawing control program.

Images