CN117518537A - Printing method of direct platemaking machine based on double acousto-optic modulator - Google Patents
Printing method of direct platemaking machine based on double acousto-optic modulator Download PDFInfo
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- CN117518537A CN117518537A CN202311556146.XA CN202311556146A CN117518537A CN 117518537 A CN117518537 A CN 117518537A CN 202311556146 A CN202311556146 A CN 202311556146A CN 117518537 A CN117518537 A CN 117518537A
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- 238000007639 printing Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 53
- 230000010287 polarization Effects 0.000 claims abstract description 39
- 238000003384 imaging method Methods 0.000 claims description 14
- 239000013078 crystal Substances 0.000 description 4
- 230000003595 spectral effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000007645 offset printing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007648 laser printing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/02—Engraving; Heads therefor
- B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
- B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
The invention discloses a printing method of a direct platemaking machine based on a double-sound-light modulator, which belongs to the technical field of direct platemaking machines and comprises the following steps: step 1, random polarized laser is injected into a first acousto-optic modulation unit, the first acousto-optic modulation unit modulates and splits half of energy of which the polarization direction is matched with that of the random polarized laser into first multi-channel laser, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulation unit is used as emergent rays to penetrate through the first acousto-optic modulation unit; step 2, the first multichannel laser and emergent light enter a second acoustic optical modulation unit at the same time, the second acoustic optical modulation unit modulates the emergent light matched with the first multichannel laser in the polarization direction into second multichannel laser, and the first multichannel laser penetrates the second acoustic optical modulation unit; and 3, scanning and printing by using the first multi-channel laser and the second multi-channel laser. The energy of the polarized laser beam is fully utilized, the service efficiency of the laser is doubled, and the requirement on the power of the laser is correspondingly reduced.
Description
Technical Field
The invention belongs to the technical field of direct platemaking machines, and particularly relates to a printing method of a direct platemaking machine based on a double-sound-light modulator.
Background
Computer-to-plate (CTP) machines are generally divided into four general categories, inner drum, outer drum, flat plate, and curved. Of these four types, the most used are inner and outer drums; wherein, the high-grade CTP platemaking machine with better performance adopts an external drum type. As shown in fig. 1 and 2, in an external drum platemaking system, printing plate 3 is fixed to the outside of imaging drum 2, and as imaging drum 2 rotates in the circumferential direction at a speed of several hundred revolutions per minute, printing plate 3 rotates with imaging drum 2 at the same speed. At the same time, the laser light emitted from the optical print head 1 irradiates the printing plate, and the optical print head 1 moves along the rail 10, thereby completing the scanning of the printing plate 3. In general, to improve the production efficiency, a plurality of laser beams are often used for scanning.
CTP platemaking machines are also classified into various types according to printing plate materials, wherein the equipment for printing flexographic plates is called a flexographic plate making machine, the resolution of which is also required to be above 5080DPI, the printing breadth of the flexographic plate making machine is larger, the laser printing power is higher, the thickness of the plate material is thicker than 0.27mm of the traditional offset printing, and the thickness of the plate material is about 0.9mm to 4 mm. The printing power of a flexographic plate making machine is about an order of magnitude higher than that of a standard offset printing CTP equipment plate, an industrial fiber laser with hundreds of watts is used for carrying out multi-channel spectral modulation on a light beam of the industrial fiber laser, and an acousto-optic modulator is usually adopted as a multi-channel spectral device.
The acousto-optic modulator uses an ultrasonic transducer to generate ultrasonic waves, the ultrasonic waves pass through the acousto-optic crystal, the refractive indexes of the crystal at the wave crest and the wave trough are different, so that the acousto-optic crystal becomes a phase grating, and a laser beam passes through the phase grating to be diffracted, thereby realizing the modulation of the laser beam, and further forming a plurality of fine light spots on the printing plate. The response speed of the acousto-optic modulator modulating light beam depends on the time of the ultrasonic wave passing through the whole light beam diameter, so that the finer the laser beam passing through the acousto-optic modulator, the faster the speed of the acousto-optic modulator modulating the switching laser beam. For high power lasers, a finer laser beam means a higher laser energy density and the acousto-optic crystal will not withstand the laser power, so the thickness of the laser beam needs to be a reasonable value. Besides a special polarization-preserving laser, the laser beam output by the industrial fiber laser is randomly polarized laser whether in a single mode or in a multimode mode. When the acousto-optic modulator performs spectral modulation, the bragg diffraction is adopted, so that the modulated light beam can be effectively linearly polarized light with proper polarization direction, for randomly polarized laser, a polarization spectroscope is needed to be used for reflecting half of the laser, and the rest half of the linearly polarized laser is used for spectral modulation printing, so that the optical system of the optical printing head 1 of the conventional CTP platemaking machine at present is shown in the figure 3 and comprises the polarization spectroscope 4, the acousto-optic modulator 5 and the imaging unit 6 which are sequentially arranged on a laser light path.
The optical system of the CTP platemaking machine needs to reflect half laser, however, the soft plate printing resolution is very high, the laser needs to use a pure single-mode laser, the high-power single-mode laser is high in cost, and the quality of the light beam is more difficult to make, so that if all the energy of the randomly polarized laser beam can be used, the use efficiency of the laser is doubled, and the requirement on the power of the laser is correspondingly reduced.
Disclosure of Invention
The invention provides a printing method of a direct plate making machine based on a double acousto-optic modulator, which aims to solve the problem that the power requirement of the plate making machine on a laser is high because half of laser needs to be reflected by an optical system of the existing plate making machine.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the invention relates to a printing method of a direct platemaking machine based on a double-sound-light modulator, which comprises the following steps:
step 1, random polarized laser is injected into a first acousto-optic modulation unit, the first acousto-optic modulation unit modulates and splits half of energy of which the polarization direction is matched with that of the random polarized laser into first multi-channel laser, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulation unit is used as emergent rays to penetrate through the first acousto-optic modulation unit;
step 2, the first multichannel laser and emergent light enter a second acoustic optical modulation unit at the same time, the second acoustic optical modulation unit modulates the emergent light matched with the first multichannel laser in the polarization direction into second multichannel laser, and the first multichannel laser penetrates the second acoustic optical modulation unit;
and 3, focusing the first multichannel laser and the second multichannel laser by the imaging unit, and projecting the first multichannel laser and the second multichannel laser onto the printing plate for scanning printing.
Preferably, the first acousto-optic modulation unit is a first acousto-optic modulator, the second acousto-optic modulation unit comprises a half wave plate and a second acousto-optic modulator, and the polarization directions of the first acousto-optic modulator and the second acousto-optic modulator are the same;
the step 2 specifically includes:
step 2.1, enabling the first multichannel laser and emergent light to enter a half-wave plate, and enabling the half-wave plate to rotate the polarization directions of the first multichannel laser and the emergent light by 90 degrees;
and 2.2. The first multichannel laser and emergent light after the polarization direction rotation enter a second acoustic optical modulator, the second acoustic optical modulator modulates the emergent light into second multichannel laser, the first multichannel laser penetrates through the second acoustic optical modulator, and the first multichannel laser and the second multichannel laser are arranged along a straight line.
Preferably, the first acoustic-optic modulation unit is a first acoustic-optic modulator, the second acoustic-optic modulation unit is a second acoustic-optic modulator, and the polarization directions matched by the first acoustic-optic modulator and the second acoustic-optic modulator are vertical;
the arrangement direction of each laser in the second multi-channel laser formed by modulation in the step 2 is perpendicular to the arrangement direction of each laser in the first multi-channel laser formed by modulation in the step 1.
Preferably, the step 3 controls the modulation angle of each laser in the first multi-channel laser through the first acousto-optic modulator, so that the lasers of adjacent channels in the first multi-channel laser are tangential; controlling the modulation angles of all the lasers in the second multichannel laser through the second acoustic optical modulator to enable the lasers of adjacent channels in the second multichannel laser to be tangential, wherein the number of the lasers in the second multichannel laser is the same as that of the lasers in the first multichannel laser;
when in scanning printing, the included angles between the scanning direction and the arrangement direction of the first multi-channel laser and the second multi-channel laser are 45 degrees, and each laser in the first multi-channel laser has one laser in the second multi-channel laser in the scanning direction.
Preferably, the step 3 controls the modulation angle of each laser in the first multi-channel laser through the first acousto-optic modulator, controls the angle of each laser in the second multi-channel laser through the second acousto-optic modulator, so that the light spots formed when the lasers of adjacent channels in the first multi-channel laser are projected onto the printing plate are arranged at intervals, and the light spots formed when the lasers of adjacent channels in the second multi-channel laser are projected onto the printing plate are arranged at intervals, wherein the number of the lasers in the second multi-channel laser is the same as the number of the lasers in the first multi-channel laser;
during scanning printing, the included angles between the scanning direction and the arrangement direction of the first multi-channel laser and the arrangement direction of the second multi-channel laser are 45 degrees, and all lasers in the first multi-channel laser and the second multi-channel laser are staggered in the vertical direction of the scanning direction.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
the invention relates to a printing method of a direct platemaking machine based on a double-acousto-optic modulator, which comprises the steps of firstly using a first acousto-optic modulation unit to modulate and split half of energy with a polarization direction matched with the random polarized laser into first multi-channel laser, and using the half of energy with the rest polarization direction not matched with the first acousto-optic modulation unit as emergent light to penetrate through the first acousto-optic modulation unit; modulating emergent light rays with the polarization direction matched with the second acoustic optical modulation unit into second multichannel laser; and finally, scanning by using the first multichannel laser and the second multichannel laser. The invention reuses half laser beams reflected in the optical system of the original optical printing head, fully utilizes the energy of polarized laser beams, doubles the service efficiency of the laser, and correspondingly reduces the requirement on the power of the laser.
Drawings
FIG. 1 is a perspective view of a direct plate making machine;
FIG. 2 is a schematic diagram of the working state of the direct plate making machine;
FIG. 3 is a schematic diagram of an optical path system of an optical print head of a prior art direct-to-plate machine;
FIG. 4 is a schematic diagram of an optical system of an optical printhead according to embodiment 1 of the present invention;
FIG. 5 is a light spot pattern formed on a printing plate by a direct plate making machine according to example 1 of the present invention;
fig. 6 is a front view of the optical path system of the optical print head according to embodiments 2 and 3 of the present invention;
FIG. 7 is a top view of the optical path system of an optical printhead according to embodiments 2 and 3 of the present invention;
FIG. 8 is a light spot pattern formed on a printing plate by a direct plate making machine according to example 2 of the present invention;
FIG. 9 is a light spot pattern formed on a printing plate by a direct plate making machine according to example 3 of the present invention.
Reference numerals: the device comprises a 1-optical printing head, a 2-imaging drum, a 3-printing plate, a 4-polarization spectroscope, a 5-acousto-optic modulator, a 6-imaging unit, a 7-first acousto-optic modulator, an 8-second acousto-optic modulator, a 9-half wave plate, a 10-track, a 11-randomly polarized laser, a 12-first multi-channel laser, a 13-emergent ray and a 14-second multi-channel laser.
Detailed Description
The invention will be further understood by reference to the following examples which are given to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
Referring to fig. 4, the optical path system of the optical print head of the direct plate making machine according to the present invention includes a first acousto-optic modulation unit, a second acousto-optic modulation unit, and an imaging unit 6 disposed along the optical path of laser light. The first acousto-optic modulation unit is a first acousto-optic modulator 7, the second acousto-optic modulation unit comprises a half-wave plate 9 and a second acousto-optic modulator 8, and the polarization directions of the first acousto-optic modulator 7 and the second acousto-optic modulator 8 are the same.
Based on the optical printing head of the direct plate making machine, the printing method of the direct plate making machine based on the double acousto-optic modulator comprises the following steps:
step 1, emitting randomly polarized laser 11 into a first acousto-optic modulator 7, wherein the first acousto-optic modulator 7 modulates and splits half of energy of which the polarization direction is matched with that of the randomly polarized laser 11 into first multi-channel laser 12, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulator 7 is used as emergent light 13 to penetrate through the first acousto-optic modulator 7;
step 2, the first multi-channel laser 12 and the outgoing light 13 enter the second acoustic optical modulation unit at the same time, specifically:
step 2.1. The first multi-channel laser 12 and the outgoing light 13 enter the half-wave plate 9, and the half-wave plate 9 rotates the polarization directions of the first multi-channel laser 12 and the outgoing light 13 by 90 degrees;
step 2.2. The first multi-channel laser 12 and the emergent light 13 with the rotated polarization direction enter the second acoustic optical modulator 8, the second acoustic optical modulator 8 modulates the emergent light 13 into second multi-channel laser 14, and the first multi-channel laser 12 permeates the second acoustic optical modulator 8 due to the fact that the polarization direction is not matched with the second acoustic optical modulator 8; the first multi-channel laser 12 and the second multi-channel laser 14 formed by step 1 and step 2 are arranged along a straight line.
Step 3. The imaging unit 6 focuses the laser beams of the first multi-channel laser 12 and the second multi-channel laser 14, and projects the first multi-channel laser 12 and the second multi-channel laser 14 onto the printing plate, at this time, the modulation angles of the first acousto-optic modulator 7 and the second acousto-optic modulator 8 are calculated, so that the light spots of the first multi-channel laser 12 and the second multi-channel laser 14 projected onto the printing plate are arranged in a straight line and adjacent light spots are closely arranged, as shown in fig. 5, and the light spots are used for scanning printing.
Example 2
Referring to fig. 6 and 7, the optical path system of the optical print head of the direct plate making machine according to the present invention includes a first acousto-optic modulation unit, a second acousto-optic modulation unit, and an imaging unit 6 disposed along the optical path of laser light. The first acousto-optic modulation unit is a first acousto-optic modulator 7, the second acousto-optic modulation unit is a second acousto-optic modulator 8, and the polarization direction matched by the first acousto-optic modulator 7 and the second acousto-optic modulator 8 is vertical.
Based on the optical printing head of the direct plate making machine, the printing method of the direct plate making machine based on the double acousto-optic modulator comprises the following steps:
step 1, emitting randomly polarized laser 11 into a first acousto-optic modulator 7, wherein the first acousto-optic modulator 7 modulates and splits half of energy of which the polarization direction is matched with that of the randomly polarized laser 11 into first multi-channel laser 12, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulator 7 is used as emergent light 13 to penetrate through the first acousto-optic modulator 7;
step 2, the first multi-channel laser 12 and the emergent ray 13 enter the second multi-channel laser 8 at the same time, and as the polarization direction of the first multi-channel laser 12 and the polarization direction matched with the second multi-channel laser 8 form an included angle of 90 degrees, the first multi-channel laser 12 directly penetrates through the second multi-channel laser 8, the polarization direction of the emergent ray 13 is matched with the second multi-channel laser 8, and the second multi-channel laser 14 is modulated by the second multi-channel laser 8;
the arrangement direction of each laser in the second multi-channel laser 14 formed by modulation in the step 2 is perpendicular to the arrangement direction of each laser in the first multi-channel laser 12 formed by modulation in the step 1.
Step 3. The imaging unit 6 focuses each laser beam of the first multi-channel laser 12 and the second multi-channel laser 14, and projects the first multi-channel laser 12 and the second multi-channel laser 14 onto the printing plate, the number of lasers in the second multi-channel laser 14 is the same as the number of lasers in the first multi-channel laser 12, at this time, the modulation angles of each laser in the first multi-channel laser 12 are controlled by the first acousto-optic modulator 7, the modulation angles of each laser in the second multi-channel laser 14 are controlled by the second acousto-optic modulator 8, so that the light spots formed when the lasers of the adjacent channels in the first multi-channel laser 12 are projected onto the printing plate are tangent, as shown in fig. 8, the light spots are adopted for scanning and printing, the included angle between the scanning direction of the first multi-channel laser 12 and the arrangement direction of the second multi-channel laser 14 is 45 degrees, each laser in the first multi-channel laser 12 is in the scanning direction, so that the first multi-channel laser 12 and the second multi-channel laser 14 are in the scanning direction, the two light spots are in the same time, the two light spots can be printed in the same time, and the two light spots can be overlapped, and the two light spots can be printed on the same one surface, and the two light spots are in the corresponding directions, and the two light spots are not overlapped.
Example 3
Referring to fig. 6 and 7, the optical path system of the optical print head of the direct plate making machine according to the present invention includes a first acousto-optic modulation unit, a second acousto-optic modulation unit, and an imaging unit 6 disposed along the optical path of laser light. The first acousto-optic modulation unit is a first acousto-optic modulator 7, the second acousto-optic modulation unit is a second acousto-optic modulator 8, and the polarization direction matched by the first acousto-optic modulator 7 and the second acousto-optic modulator 8 is vertical.
Based on the optical printing head of the direct plate making machine, the printing method of the direct plate making machine based on the double acousto-optic modulator comprises the following steps:
step 1, emitting randomly polarized laser 11 into a first acousto-optic modulator 7, wherein the first acousto-optic modulator 7 modulates and splits half of energy of which the polarization direction is matched with that of the randomly polarized laser 11 into first multi-channel laser 12, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulator 7 is used as emergent light 13 to penetrate through the first acousto-optic modulator 7;
step 2, the first multi-channel laser 12 and the emergent ray 13 enter the second multi-channel laser 8 at the same time, and as the polarization direction of the first multi-channel laser 12 and the polarization direction matched with the second multi-channel laser 8 form an included angle of 90 degrees, the first multi-channel laser 12 directly penetrates through the second multi-channel laser 8, the polarization direction of the emergent ray 13 is matched with the second multi-channel laser 8, and the second multi-channel laser 14 is modulated by the second multi-channel laser 8;
the arrangement direction of each laser in the second multi-channel laser 14 formed by modulation in the step 2 is perpendicular to the arrangement direction of each laser in the first multi-channel laser 12 formed by modulation in the step 1.
Step 3. The imaging unit 6 focuses the laser beams of the first multi-channel laser 12 and the second multi-channel laser 14, and projects the first multi-channel laser 12 and the second multi-channel laser 14 onto the printing plate, the number of the laser beams of the second multi-channel laser 14 is the same as the number of the laser beams of the first multi-channel laser 12, at this time, the modulation angle of each laser beam of the first multi-channel laser 12 is controlled by the first acousto-optic modulator 7, the modulation angle of each laser beam of the second multi-channel laser 14 is controlled by the second acousto-optic modulator 8, so that the light spots formed when the laser beams of the adjacent channels of the first multi-channel laser 12 are projected onto the printing plate are arranged at intervals, so that the light spots formed when the laser beams of the adjacent channels of the second multi-channel laser 14 are projected onto the printing plate are arranged at intervals, the number of the laser beams of the second multi-channel laser 14 is the same as the number of the laser beams of the first multi-channel laser 12, the included angle between the scanning direction and the arrangement direction of the first multi-channel laser 12 and the arrangement direction of the second multi-channel laser 14 is 45 °, and the perpendicular directions of each laser beams of the first multi-channel laser 12 and the second multi-channel laser 14 are arranged at right angles, as shown in fig. 9.
At this time, the space between the light spots of each channel of each laser beam is reserved, and the light beams of the second acoustic optical modulator 8 can be exactly supplemented into the space of the first acoustic optical modulator 7, so that the equivalent total printing channel number of the two acoustic optical modulators is doubled, and the energy of the laser is not wasted.
The present invention has been described in detail with reference to the embodiments, but the description is only the preferred embodiments of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention should be considered as falling within the scope of the present invention.
Claims (5)
1. A printing method of a direct platemaking machine based on a double acousto-optic modulator is characterized in that: the method comprises the following steps:
step 1, random polarized laser is injected into a first acousto-optic modulation unit, the first acousto-optic modulation unit modulates and splits half of energy of which the polarization direction is matched with that of the random polarized laser into first multi-channel laser, and the rest half of energy of which the polarization direction is not matched with that of the first acousto-optic modulation unit is used as emergent rays to penetrate through the first acousto-optic modulation unit;
step 2, the first multichannel laser and emergent light enter a second acoustic optical modulation unit at the same time, the second acoustic optical modulation unit modulates the emergent light matched with the first multichannel laser in the polarization direction into second multichannel laser, and the first multichannel laser penetrates the second acoustic optical modulation unit;
and 3, focusing the first multichannel laser and the second multichannel laser by the imaging unit, and projecting the first multichannel laser and the second multichannel laser onto the printing plate for scanning printing.
2. The method for printing by a direct-to-plate machine based on a double acousto-optic modulator according to claim 1, wherein: the first acousto-optic modulation unit is a first acousto-optic modulator, the second acousto-optic modulation unit comprises a half wave plate and a second acousto-optic modulator, and the polarization directions of the first acousto-optic modulator and the second acousto-optic modulator are the same;
the step 2 specifically includes:
step 2.1, enabling the first multi-channel laser and emergent light to enter a half-wave plate, and enabling the half-wave plate to rotate the first multi-channel laser and the emergent light by 90 degrees in the positive direction;
and 2.2. The first multichannel laser and emergent light after rotating in the eccentric direction enter a second acoustic optical modulator, the second acoustic optical modulator modulates the emergent light into second multichannel laser, the first multichannel laser penetrates through the second acoustic optical modulator, and the first multichannel laser and the second multichannel laser are arranged along a straight line.
3. The method for printing by a direct-to-plate machine based on a double acousto-optic modulator according to claim 1, wherein: the first acousto-optic modulation unit is a first acousto-optic modulator, the second acousto-optic modulation unit is a second acousto-optic modulator, and the polarization direction matched by the first acousto-optic modulator and the second acousto-optic modulator is vertical;
the arrangement direction of each laser in the second multi-channel laser formed by modulation in the step 2 is perpendicular to the arrangement direction of each laser in the first multi-channel laser formed by modulation in the step 1.
4. A direct-to-plate printing method based on a dual-acousto-optic modulator according to claim 3, wherein: step 3, controlling the modulation angle of each laser in the first multi-channel laser through the first acousto-optic modulator, and controlling the modulation angle of each laser in the second multi-channel laser through the second acousto-optic modulator, so that light spots formed when lasers of adjacent channels in the first multi-channel laser are projected onto a printing plate are tangential, light spots formed when lasers of adjacent channels in the second multi-channel laser are projected onto the printing plate are tangential, and the number of lasers in the second multi-channel laser is the same as that of the lasers in the first multi-channel laser;
when in scanning printing, the included angles between the scanning direction and the arrangement direction of the first multi-channel laser and the second multi-channel laser are 45 degrees, and each laser in the first multi-channel laser has one laser in the second multi-channel laser in the scanning direction.
5. A direct-to-plate printing method based on a dual-acousto-optic modulator according to claim 3, wherein: step 3, controlling the modulation angle of each laser in the first multi-channel laser through the first acousto-optic modulator, controlling the angle of each laser in the second multi-channel laser through the second acousto-optic modulator, enabling light spots formed when lasers of adjacent channels in the first multi-channel laser are projected onto a printing plate to be arranged at intervals, enabling light spots formed when lasers of adjacent channels in the second multi-channel laser are projected onto the printing plate to be arranged at intervals, wherein the number of lasers in the second multi-channel laser is the same as that of lasers in the first multi-channel laser;
during scanning printing, the included angles between the scanning direction and the arrangement direction of the first multi-channel laser and the arrangement direction of the second multi-channel laser are 45 degrees, and all lasers in the first multi-channel laser and the second multi-channel laser are staggered in the vertical direction of the scanning direction.
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| CN115213565A (en) * | 2021-04-16 | 2022-10-21 | 大族激光科技产业集团股份有限公司 | Laser marking device and method |
| US20230271273A1 (en) * | 2021-06-30 | 2023-08-31 | Mitsubishi Electric Corporation | Laser apparatus and laser machining apparatus |
| KR20230154673A (en) * | 2022-05-02 | 2023-11-09 | 주식회사 이오테크닉스 | Apparatus and method of forming hole |
-
2023
- 2023-11-21 CN CN202311556146.XA patent/CN117518537A/en not_active Withdrawn
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| JPH1132176A (en) * | 1997-07-11 | 1999-02-02 | Asahi Optical Co Ltd | Laser plotting device |
| CN108469693A (en) * | 2018-04-13 | 2018-08-31 | 中国科学院西安光学精密机械研究所 | A kind of binary channels acousto-optic tunable filter and Hyperspectral imaging devices |
| CN115213565A (en) * | 2021-04-16 | 2022-10-21 | 大族激光科技产业集团股份有限公司 | Laser marking device and method |
| US20230271273A1 (en) * | 2021-06-30 | 2023-08-31 | Mitsubishi Electric Corporation | Laser apparatus and laser machining apparatus |
| KR20230154673A (en) * | 2022-05-02 | 2023-11-09 | 주식회사 이오테크닉스 | Apparatus and method of forming hole |
Non-Patent Citations (1)
| Title |
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| V. M. KOTOV ET AL: "Amplitude Modulation of Two-Color Radiation at Double Sound Frequency", 《JOURNAL OF COMMUNICATIONS TECHNOLOGY AND ELECTRONICS》, 23 May 2023 (2023-05-23), pages 1 - 3 * |
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Application publication date: 20240206 |