Engraving in a computer numerically controlled machine

Patent metadata

Field	Value
Publication number	US-10737355-B2
Application number	US-201715823505-A
Country	US
Kind code	B2
Filing date	Nov 27, 2017
Priority date	Nov 25, 2016
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A method for dithering can include receiving, at a computer numerically controlled machine comprising a laser, a motion plan corresponding to a first image. The output of the laser can be dithered, in accordance with the motion plan, to effect a change in a material within an interior space of the computer numerically controlled machine. The change can substantially reproduce at least a portion of the first image on the material. The dithering can include providing laser energy to the material at a native resolution based at least on a spot size of the laser. The spot size can be determined based at least on one or more parameters of the computer numerically controlled machine and/or one or more properties of the material. The laser energy can be delivered at locations separated by a distance no less than the spot size.

First claim

The invention claimed is:

1. A computer-implemented method comprising:
receiving, at a computer numerically controlled machine comprising a laser, a motion plan corresponding to a first image; and
dithering, according to the motion plan, the output of the laser to effect a change in a material within an interior space of the computer numerically controlled machine, the change corresponding to at least a portion of the first image on the material, the dithering comprising providing laser energy to the material at a native resolution based at least on a spot size of the laser, the spot size determined based at least on one or more parameters of the computer numerically controlled machine and/or one or more properties of the material, and the laser energy being delivered at locations separated by a distance no less than the spot size.

2. The computer-implemented method of claim 1 , wherein the spot size is determined based on a laser power defined at the motion plan, a laser focal length retrieved from the computer numerically controlled machine, a material type stored at the computer numerically controlled machine, and/or a distance from the laser head to the material determined based on at least an image from a camera in the computer numerically controlled machine.

3. The computer-implemented method of claim 1 , wherein the delivery of the laser energy is limited by at least limiting the actuation of the laser head and/or selectively providing the laser output to the material, and wherein the limiting is in accordance with one or more instructions defined in the motion plan.

4. The computer-implemented method of claim 1 , the dithering further comprising:
calculating, based on a first laser spot on an image of the material, an overlap of a second laser spot on pixels of the image adjacent to a center of the first laser spot, the overlap calculated in a direction of travel of the laser, the overlap further calculated based on a quantity of laser pulses delivered on the adjacent pixels at a speed of the laser and/or an oscillation frequency of the laser;
generating a laser cross section profile based at least on a width of the first laser spot and a height of a line made by the laser on the material; and
applying, by the laser, a modification to a requested laser output based on the generated laser cross section profile and the overlap.

5. The computer-implemented method of claim 4 , wherein the modification is to at least one of an output power of the laser, the speed of the laser, and the spot size.

6. The computer-implemented method of claim 4 , wherein the generated laser cross section profile comprises a Gaussian oval, wherein the Gaussian oval is associated with a height dimension and a width dimension, and wherein a power distribution along the height and the width are both Gaussians having a full-width, half-maximum corresponding to the height and the width.

7. A computer-implemented method comprising:
receiving, at a computer numerically controlled machine comprising a laser, a motion plan corresponding to a first image; and
dithering, according to the motion plan, the output of the laser to effect a change in a material within an interior space of the computer numerically controlled machine, the change corresponding to at least a portion of the first image on the material, the dithering comprising providing laser energy to the material, the laser energy being delivered to locations separated by a first horizontal distance no less than a first horizontal velocity of the laser head divided by a pulse rate of the laser and/or a second horizontal distance corresponding to a second horizontal step size and the pulse rate of the laser.

8. A computer-implemented method comprising:
altering a first image and/or a computer numerically controlled machine parameter to dither a second image on a surface of a material, the second image corresponding to the first image, the adjusting comprising one or more of:
adjusting a feature of the first image to alter an operation of the computer numerically controlled machine while keeping the computer numerically controlled machine parameter fixed; and
adjusting the computer numerically controlled machine parameter to alter the operation of the computer numerically controlled machine while keeping features of the first image fixed;
generating, based at least on the altered first image and/or the altered computer numerically controlled machine parameter, a motion plan; and
executing, at the computer numerically controlled machine, the motion plan to cause the second image to be dithered on the surface of the material.

9. The computer-implemented method of claim 8 , wherein the feature comprises a color depth of the first image, a resolution of the first image, a type of the first image, whether the surface is to be marked to a uniform depth or a variable depth, and/or a user preference for a darker second image or a lighter second image.

10. The computer-implemented method of claim 8 , wherein the computer numerically controlled machine parameters comprise at least one of: a tool spot size, a tool spot shape, the material being processed, a quantity of colors and/or shades the material can display, a speed at which the tool will move, an output power of the tool, a depth of to which the tool affects the material, whether a pulse technique and/or a drag technique are being used, a horizontal positioning resolution, a vertical positioning resolution, delays in changing tool parameters, a quantity of passes required to dither the second image, one or more focus settings of the tool, and a surface height of the material.

11. A system, comprising:
at least one data processor; and
at least one memory storing instructions, which when executed by the at least one data processor, cause operations comprising:
receiving, at a computer numerically controlled machine comprising a laser, a motion plan corresponding to a first image; and
dithering, according to the motion plan, the output of the laser to effect a change in a material within an interior space of the computer numerically controlled machine, the change corresponding to at least a portion of the first image on the material, the dithering comprising providing laser energy to the material at a native resolution based at least on a spot size of the laser, the spot size determined based at least on one or more parameters of the computer numerically controlled machine and/or one or more properties of the material, and the laser energy being delivered at locations separated by a distance no less than the spot size.

12. The system of claim 11 , wherein the spot size is determined based on a laser power defined at the motion plan, a laser focal length retrieved from the computer numerically controlled machine, a material type stored at the computer numerically controlled machine, and/or a distance from the laser head to the material determined based on at least an image from a camera in the computer numerically controlled machine.

13. The system of claim 11 , wherein the delivery of the laser energy is limited by at least limiting the actuation of the laser head and/or selectively providing the laser output to the material, and wherein the limiting is in accordance with one or more instructions defined in the motion plan.

14. The system of claim 11 , the dithering further comprising:
calculating, based on a first laser spot on an image of the material, an overlap of a second laser spot on pixels of the image adjacent to a center of the first laser spot, the overlap calculated in a direction of travel of the laser, the overlap further calculated based on a q

Assignees

• Glowforge Inc

Inventors

• Shapiro Daniel
• Gosselin Mark
• Wright Anthony
• Ludwick Rachael
• Park Jonathan

Classifications

• B23K37/0235 Primary

  the guide member forming part of a portal · CPC title

• B23K26/40

  taking account of the properties of the material involved · CPC title

• G05B19/40937

  concerning programming of machining or material parameters, pocket machining · CPC title

• B23K26/362

  Laser etching · CPC title

• B23K2103/42

  Plastics other than composite materials · CPC title