CN118038778B - Optical scanning method based on linear array light source - Google Patents
Optical scanning method based on linear array light source Download PDFInfo
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- CN118038778B CN118038778B CN202410438758.7A CN202410438758A CN118038778B CN 118038778 B CN118038778 B CN 118038778B CN 202410438758 A CN202410438758 A CN 202410438758A CN 118038778 B CN118038778 B CN 118038778B
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- 238000001514 detection method Methods 0.000 claims 1
- 238000010146 3D printing Methods 0.000 abstract description 7
- 238000007639 printing Methods 0.000 abstract description 4
- 238000000016 photochemical curing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001723 curing Methods 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
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Abstract
The invention relates to the technical field of micro display scanning, and discloses an optical scanning method based on a linear array light source, which comprises the following steps: step S1, receiving a trigger signal, supplying power to a linear array light source at a first moment, and lighting the linear array light source; step S2, supplying power to the linear array light source from a first moment to a second moment at a first power Pmax, so that the energy value of an irradiation area of the linear array light source is increased by a first energy change curve, and the exposure energy threshold En is reached at a first intermediate moment tx, wherein the first intermediate moment tx is smaller than the second moment; step S3, supplying power to the linear array light source from the second moment to the third moment by using the stable transition power Pn, so that the energy value of the irradiation area of the linear array light source is reduced to En at the third moment; step S4, maintaining the power supply of the linear array light source from the third time to the fourth time; and S5, supplying power to the linear array light source at the second power Pmax from the fourth moment to the fifth moment. The method can improve the definition of the 3D printing photo-cured image and increase the effective printing area.
Description
Technical Field
The invention relates to the technical field of micro display scanning, in particular to an optical scanning method based on a linear array light source.
Background
With development of micro display technology, resolution of light emitting devices such as LCD is higher and higher, the LCD screen is also applied to photo-curing 3D printing scene, for example, 2K resolution can meet the requirement of common 3D printing, in addition, the LCD screen adopts an area array photo-curing mode, so that printing speed can be improved, but the LCD area array 3D printing has disadvantages, for example, the LCD screen which is a key technical component needs to have good transmission selectivity to ultraviolet 405nm wavelength light and bear long-time high-intensity baking of tens of watts 405nm LED lamp beads, so that the LCD screen is easy to damage and becomes a consumable part, and maintenance cost of 3D printing equipment is improved. In addition, in the existing linear array scanning scheme, since the linear array light source is driven to emit light by adopting regular pulses, the exposure speed is low at the boundary of the scanned image, so that the edge blurring area of the scanned exposure image is too wide to form a clear boundary, and the actual effective exposure area is smaller. In the scheme of adopting DMD exposure, a certain response time is needed for the polarization of the micromirrors of the DMD, so that the response speed is slower, and the problems of too wide edge blurring area and unclear boundary are also existed.
Disclosure of Invention
In order to solve the technical problems, the invention provides an optical scanning method based on a linear array light source, which can improve the edge definition of a 3D printing photo-curing image, and has a faster printing speed under the condition of ensuring the exposure of the image.
The technical scheme of the invention is as follows: an optical scanning method based on a linear array light source comprises the following steps:
Step S1, receiving a trigger signal, supplying power to a linear array light source at a first moment, and lighting the linear array light source;
Step S2, supplying power to the linear array light source from a first moment to a second moment at a first power Pmax, so that the energy value of an irradiation area of the linear array light source is increased by a first energy change curve, the energy value reaches an exposure energy threshold En at a first intermediate moment tx, and the energy peak Emax is reached at the second moment, wherein the first intermediate moment tx is smaller than the second moment;
step S3, supplying power to the linear array light source from the second moment to the third moment by using the stable transition power Pn, so that the energy value of the irradiation area of the linear array light source is reduced to En at the third moment;
step S4, maintaining the power Pn of the linear array light source from the third time to the fourth time so that the energy value of the irradiation area of the linear array light source is maintained as En;
And S5, supplying power to the linear array light source at the second power Pmax from the fourth moment to the fifth moment so that the energy value of the irradiation area of the linear array light source reaches the energy peak value Emax at the fifth moment.
Further, the linear array light source means that a plurality of light emitting pixel units are sequentially arranged on a straight line, and each light emitting pixel unit is powered by a driving unit.
Further, the linear array light source irradiates a scanned object, the scanned object moves along a first direction at a first speed, and the first direction is perpendicular to a straight line where the linear array light source is located.
Further, the step S1 further includes detecting a moving speed of the scanned object by a speed detecting unit, and transmitting the speed signal to a linear array light source controller, where the linear array light source controller is configured to control a lighting duration and a time of power supply of the linear array light source based on the moving speed.
Further, in the step S2, from the first time to the second time, the energy value of the area irradiated by the linear array light source increases with a first energy change curve, where the slope of the first energy change curve from the first time to the second time is greater than a first threshold.
Further, the first intermediate time tx is less than 1/3 of the second time.
Further, the method further comprises step S6, wherein from the fifth time to the sixth time, the power supply power of the linear array light source is 0, and the energy value of the irradiation area of the linear array light source is reduced according to the second energy curve.
Further, in the step S6, the slope of the energy change curve from the fifth time to the sixth time is opposite to the slope of the energy change from the first time to the second time.
The step S6,
From the second intermediate time tp between the fifth time and the sixth time, the energy value decreases from Emax to En.
Further, in the step S3, the power on the power line array light source is 3 to 8 times of Pmax and Pn.
Advantageous effects
The invention adopts the linear array light source to scan the image, which can reduce the cost of the scanning device or equipment, and simultaneously, the invention controls the power level of the linear array light source at different stages in the scanning process, can improve the definition of the pixel edge of the printing scanning image, and leads the printed effective pixel area to be larger as a whole.
Drawings
FIG. 1 is a schematic view of a linear array light source of the present invention;
FIG. 2 is a schematic diagram of a power control process and an energy curve according to the present invention;
FIG. 3 is a schematic diagram of a scanning device according to the present invention;
FIG. 4 is a diagram showing the scan results of the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without the inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
According to an embodiment of the present invention, an optical scanning method based on a linear array light source is provided, which can be used for performing photo-curing 3D printing scanning, and includes the following steps:
Step S1, receiving a trigger signal, supplying power to a linear array light source at a first moment, and lighting the linear array light source;
further, the linear array light source means that a plurality of light emitting pixel units are sequentially arranged on a straight line, and each light emitting pixel unit is powered by a driving unit.
Further, the linear array light source irradiates a scanned object, the scanned object moves along a first direction at a first speed, and the first direction is perpendicular to a straight line where the linear array light source is located.
Further, the step S1 further includes detecting a moving speed of the scanned object by a speed detecting unit, and transmitting the speed signal to a linear array light source controller, where the linear array light source controller is configured to control a lighting duration and a time of power supply of the linear array light source based on the moving speed.
In this embodiment, as shown in fig. 1, the linear array light source 1 means that a plurality of light emitting pixel units 11 are sequentially arranged on a straight line, and each light emitting pixel unit 11 is powered by a driving unit. Alternatively, the linear array light source 1 may be a Micro Led, so long as each light emitting pixel unit can be arranged on a straight line to form a linear array light source.
As shown in fig. 3, the linear array light source irradiates a scanned object 2, and the scanned object 2 moves along a first direction 4 at a first speed, wherein the first direction is perpendicular to a line where the linear array light source is located.
The trigger signal can be a start signal, and the start signal starts the movement of the scanned object and starts the power supply to the linear array light source;
The linear array light source 1 is arranged in the scanning bracket 4, the scanned object 2 is arranged below the linear array light source 1, the scanned object 2 moves along the first direction, the linear array light source 1 is lightened, so that one line of image is irradiated on the scanned object 2, and one line of photo-curing image is formed by controlling the brightness of each pixel of the linear array light source 1; scanning to obtain a photo-cured complete image in the process of moving the scanned object 2; the linear array light source controller is used for controlling the lighting duration and time of the power supply of the linear array light source based on the movement speed, for example, the lighting duration can be controlled to be shortened in the case of higher movement speed, or the lighting time can be controlled to be prolonged in the case of lower movement speed, so that the pixel size of the scanning area is controlled;
Step S2, supplying power to the linear array light source from a first moment to a second moment at a first power Pmax, so that the energy value of an irradiation area of the linear array light source is increased by a first energy change curve, the energy value reaches En at a first intermediate moment tx, and reaches Emax at a second moment, wherein the first intermediate moment tx is smaller than the second moment;
Further, in the step S2, from the first time to the second time, the energy value of the area irradiated by the linear array light source increases with a first energy change curve, where the slope of the first energy change curve from the first time to the second time is greater than a first threshold.
Further, tx is less than 1/3 of the second time.
Referring to fig. 2, in the two graphs, the abscissa is a time axis, the ordinate in the upper half graph is the power P of the linear array light source, and the ordinate in the lower half graph is the energy value E; the linear array light source is powered at a first power Pmax from a first time t1 to a second time t2, so that the energy value of an irradiation area of the linear array light source is increased by a first energy change curve, and the linear array light source is lightened by a waveform type rectangular pulse at the first power Pmax; further, the energy value of the irradiation area of the linear array light source from the first time t1 to the first intermediate time tx continuously rises in a first energy change curve, the exposure energy threshold value En is reached rapidly, the En is equal to or can be larger than the exposure energy threshold value of the photoresist, so that the photoresist is exposed and solidified, for example, the En can be 200mj/cm 2, and then the energy continues to increase from the first intermediate time tx to the second time, and reaches an energy peak value Emax. In this embodiment, by having the light source powered at a higher power Pmax, so that the first pixel reaches the exposure energy threshold rapidly within the time period of t1, and after reaching the exposure threshold, continues to increase until the energy peak Emax is reached, so that at the edge pixels of the image, the partial area of the first pixel rapidly reaches the exposure threshold, rapidly curing forms a distinct boundary, which is an adjacent area between every two rows of pixels in the image, which not only improves edge sharpness, but also increases the overall length of the effective cured pixel area. For the adjacent area with obvious gray level change, the invention can improve the contrast of the edge part, so that the image is clearer, and compared with the traditional uniform power Pn exposure mode, the energy value (shown by a dotted line) can reach the exposure energy threshold En only by the time t2, the effective curing area is short, and the edge is unclear;
Further, in the present invention, the slope of the first energy curve from the first time to the first intermediate time and from the first intermediate time to the second time is greater than a first threshold, for example, the first threshold is 5 or more, so that the exposure degree is rapidly increased after the pixel enters the linear array light source scanning area;
step S3, supplying power to the linear array light source from the second moment to the third moment by using the stable transition power Pn, so that the energy value of the irradiation area of the linear array light source is reduced to En at the third moment;
After the energy value reaches Emax, since the power Pmax is usually higher, for example, 8 watts, if the Pmax is used for supplying power for a long time, the linear array light source will generate serious heat and even burn out, and a great load is to be brought to the driving circuit, for this purpose, after the energy value reaches Emax, the power is immediately reduced to a relatively moderate steady transition power Pn, where the power Pn may be the exposure power threshold of the photoresist within a certain fixed duration, in this embodiment, at least the power is made to be equal to Pn, where the exposure amount of the linear array light source to the pixel is appropriate, so in this embodiment, the steady transition power Pn is used to supply power to the linear array light source, so that the energy value of the irradiation area of the linear array light source is reduced to En at the third time;
The power Pmax of the linear array light source is 3-8 times of Pn, for example, if Pn is 1 watt, the Pmax may be 3-8 watts.
Step S4, maintaining the power Pn of the linear array light source from the third time to the fourth time so that the energy value of the irradiation area of the linear array light source is maintained as En;
From the third time to the fourth time, when the power of the linear array light source is maintained at the Pn level, the scanned object still moves continuously, and in the process, the scanned object is exposed with the power Pn, so that the energy En is maintained unchanged.
And S5, supplying power to the linear array light source at the second power Pmax from the fourth moment to the fifth moment so that the energy value of the irradiation area of the linear array light source is Emax at the fifth moment.
As described above, when the pixel exposure is about to end, there is still a transition phase, that is, a portion of the pixel gradually moves out of the scanning area of the linear array light source, in this process, if the power is directly reduced from Pn to 0, the pixel edge is blurred, so from the fourth time to the fifth time, the power supply on the linear array light source is increased by the second power Pmax, so that at the fifth time, the energy of the irradiation area of the linear array light source is Emax, and the exposure intensity at this point is enhanced;
Further, the method further comprises step S6, wherein from the fifth time to the sixth time, the power supply power of the linear array light source is 0, and the energy value of the irradiation area of the linear array light source is reduced according to the second energy curve.
In the ending stage of the pixel scanning, after the energy of the irradiation area of the linear array light source reaches Emax, the power Pmax is used as 0 to turn off the power supply, so that the energy rate of the edge area is rapidly gradually increased from Emax to 0, wherein in the step S6, the slope of the energy change curve from the fifth moment to the sixth moment is opposite to the slope of the energy change from the first moment to the second moment. As shown in fig. 2, from the second intermediate time tp between the fifth time and the sixth time, the energy value decreases from Emax to En, and then after time tp, the exposure energy threshold is not reached, and gradually decreases to 0. So that the edge pixels are located near the time tp, the pixel length of the effective exposure area is increased as a whole, and the edges are clearer.
Further, the step S1 further includes detecting a moving speed of the scanned object by a speed detecting unit, and transmitting the speed signal to a linear array light source controller, where the linear array light source controller is configured to control a lighting duration and first to sixth moments of power supply of the linear array light source based on the moving speed.
Fig. 4 is a schematic diagram of a linear array scanning result of the present invention, where a scanned image includes a black area in the middle and shadow areas on both sides of the black area, the shadow areas on both sides are edge pixels, the shadow areas are effective curing areas, which occupy more than 70% of the width of a single pixel, and the conventional boundary pixels can be effectively cured only by about 50%, so that the effective pixel areas are larger and the boundaries of the edge pixel areas are clear compared with the conventional scanning method.
While the foregoing has been described in relation to illustrative embodiments thereof, so as to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, but is to be construed as limited to the spirit and scope of the invention as defined and defined by the appended claims, as long as various changes are apparent to those skilled in the art, all within the scope of which the invention is defined by the appended claims.
Claims (7)
1. An optical scanning method based on a linear array light source is characterized by comprising the following steps:
Step S1, receiving a trigger signal, supplying power to a linear array light source at a first moment, and lighting the linear array light source; the linear array light source is characterized in that a plurality of luminous pixel units are sequentially arranged on a straight line, and each luminous pixel unit is powered by a driving unit; the linear array light source irradiates a scanned object, the scanned object moves along a first direction at a first speed, and the first direction is perpendicular to a straight line where the linear array light source is positioned; the step S1 further comprises detecting the moving speed of the scanned object through a speed detection unit, and transmitting the speed signal to a linear array light source controller, wherein the linear array light source controller is used for controlling the lighting duration and time of power supply of the linear array light source based on the moving speed;
Step S2, supplying power to the linear array light source from a first moment to a second moment at a first power Pmax, so that the energy value of an irradiation area of the linear array light source is increased by a first energy change curve, the energy value reaches an exposure energy threshold En at a first intermediate moment tx, and the energy peak Emax is reached at the second moment, wherein the first intermediate moment tx is smaller than the second moment;
step S3, supplying power to the linear array light source from the second moment to the third moment by using the stable transition power Pn, so that the energy value of the irradiation area of the linear array light source is reduced to En at the third moment;
step S4, maintaining the power Pn of the linear array light source from the third time to the fourth time so that the energy value of the irradiation area of the linear array light source is maintained as En;
And S5, supplying power to the linear array light source at the second power Pmax from the fourth moment to the fifth moment so that the energy value of the irradiation area of the linear array light source reaches the energy peak value Emax at the fifth moment.
2. The optical scanning method according to claim 1, wherein the step S2 is performed by supplying power to the linear array light source from a first time to a second time at a first power Pmax, so that the energy value of the irradiation area of the linear array light source increases with a first energy variation curve, and the slope of the first energy variation curve from the first time to the second time is greater than a first threshold.
3. An optical scanning method based on a linear array light source according to claim 1, characterized in that the first intermediate instant tx is smaller than 1/3 of the second instant.
4. The optical scanning method based on a linear array light source according to claim 1, further comprising step S6, after step S5, wherein from the fifth time to the sixth time, the power supply on the linear array light source is 0, and the energy value of the irradiation area of the linear array light source is reduced according to the second energy curve.
5. The method of claim 4, wherein the slope of the energy change curve from the fifth time to the sixth time is opposite to the slope of the energy change from the first time to the second time in step S6.
6. The method of claim 5, wherein the energy value decreases to En from a second intermediate time tp between a fifth time and a sixth time in step S6.
7. The optical scanning method based on the linear array light source according to claim 1, wherein in the step S3, the power Pmax on the linear array light source is 3-8 times of Pn.
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