阅读说明：本技术 一种双激光器水松纸打孔光学系统 (Dual-laser tipping paper punching optical system ) 是由 邵华江 李思佳 于 2020-07-10 设计创作，主要内容包括：本发明公开了一种双激光器水松纸打孔光学系统,包括2组光路系统,该2组光路系统共用1片多面棱镜；每组光路系统包括CO2激光器、第一金属平面反射镜、第二金属平面反射镜、扩束负焦镜、扩束正焦镜、长焦聚焦镜构成1套主光路,以及包括长焦准直镜、第一平面反射镜、第二平面反射镜、短焦聚焦镜组构成n套子光路,本发明基于超高速激光扫描打孔光学特性,通过双激光器共同出光打孔,在超高速走纸下有助于改善打孔毛刺,降低变异系数,拓宽透气度上下限,并有效提高宽幅面水松纸多道打孔效率。(The invention discloses a double-laser tipping paper punching optical system, which comprises 2 groups of optical path systems, wherein the 2 groups of optical path systems share 1 piece of multi-surface prism; each group of optical path system comprises 1 set of main optical path consisting of a CO2 laser, a first metal plane reflector, a second metal plane reflector, a beam expanding negative focal lens, a beam expanding positive focal lens and a long focal focusing lens, and n sets of sub optical paths consisting of a long focal collimating lens, a first plane reflector, a second plane reflector and a short focal focusing lens.)

1. The utility model provides a twin laser china cypress paper optical system that punches, includes 2 optical path systems of group, its characterized in that: the 2 groups of optical path systems share 1 piece of polygon prism (7); each group of optical path systems comprises 1 set of main optical paths consisting of a CO2 laser (1), a first metal plane reflector (2), a second metal plane reflector (3), a beam expanding negative focal lens (4), a beam expanding positive focal lens (5) and a long focal focusing lens (6), and n sets of sub optical paths consisting of a long focal collimating lens (8), a first plane reflector (9), a second plane reflector (10) and a short focal focusing lens set (11); in addition, the water-proof fabric also comprises tipping paper (12);

the CO2 laser (1) of the main optical path is sequentially provided with a first metal plane reflector (2) and a second metal plane reflector (3) in the horizontal direction;

a beam expanding negative focal lens (4), a beam expanding positive focal lens (5), a long-focus focusing lens (6) and a multi-surface prism (7) are sequentially arranged obliquely below a second metal plane reflector (3) of the main light path;

a long-focus collimating mirror (8) and a first plane reflecting mirror (9) of a sub-optical path are sequentially arranged obliquely above the multi-surface prism (7);

a second plane reflector (10) is arranged in the horizontal direction of the first plane reflector (9) of the sub-optical path;

and a short-focus focusing lens group (11) and tipping paper (12) are arranged below the second plane reflector (10) of the sub-optical path.

2. The dual laser tipping paper perforating optical system of claim 1, wherein: water cooling channels are arranged inside the first metal plane reflector (2) and the second metal plane reflector (3) of the main light path, and the light beam deflection angle is between 30 and 150 degrees;

the central axes of the beam expanding negative focal lens (4), the beam expanding positive focal lens (5) and the long focal lens (6) of the main light path are coaxial, and the lens materials are zinc selenide or germanium;

the beam expanding negative focal lens (4) and the beam expanding positive focal lens (5) of the main light path respectively comprise at least 1 lens, and the beam expanding multiple is in the range of 1-8 times;

the long-focus focusing lens (6) of the main light path is a long-focus single lens, the focal length is between 200mm and 500mm, zinc selenide or germanium materials are adopted, and the lens types comprise plano-convex type, biconvex type and positive meniscus type;

the multi-surface prism (7) is provided with 10-100 reflection beam splitting mirror surfaces, is a cylindrical multi-surface prism and is made of aluminum alloy;

the long-focus collimating lens (8) of the sub-optical path is a long-focus single lens, the focal length is between 200mm and 500mm, zinc selenide or germanium materials are adopted, and the types of the lens comprise plano-convex type, biconvex type and positive meniscus type;

the central optical axes of the long-focus focusing lens (6) of the main optical path and the long-focus collimating lens (8) of the sub optical path are intersected on the surface of the light splitting mirror surface of the polygon prism (7);

the focal length of the long-focus focusing lens (6) of the main light path is less than or equal to that of the long-focus collimating lens (8) of the sub light path;

the specifications of a first plane reflector (9) and a second plane reflector (10) of the sub-optical paths are the same, the reference beam deflection angles are both 90 degrees, and the materials comprise Si, SiC, copper and aluminum alloy;

the short-focus focusing lens group (11) of the sub-optical path is a double-sheet type aberration eliminating lens group made of zinc selenide or germanium materials, and the focal length is in the range of 30mm-100 mm.

3. The dual laser tipping paper perforating optical system of claim 2, wherein: the optical paths of the CO2 laser (1), the first metal plane reflector (2), the second metal plane reflector (3), the beam expanding negative focal lens (4), the beam expanding positive focal lens (5) and the long focal lens (6) of the main optical paths of the 2 groups of optical path systems are same in one-to-one correspondence, and the 2 sets of main optical paths are symmetrical relative to the vertical symmetrical plane of the central shaft of the multi-surface prism (7);

n sets of sub-optical paths of the 2 groups of optical path systems meet the condition that n is more than or equal to 2, the optical distances between the long-focus collimating lenses (8) of all the sub-optical paths and the first plane reflecting mirror (9) are the same, the optical distances are symmetrical from the center to the edge one by one relative to the vertical symmetrical plane of the central shaft of the multi-surface prism (7), the optical distances between the multi-surface prism (7) and the long-focus collimating lenses (8) of all the sub-optical paths are the same, and the included angles of the central shafts between the adjacent long-focus collimating lenses (8) are the same and are all;

the center of each sub-optical path of the 2 groups of optical path systems is connected with the center of the second plane reflector (10) through the first plane reflector (9) and is vertical to the central axis of the long-focus collimating lens (8) corresponding to the sub-optical path, and the central axis of the short-focus focusing lens group (11) is parallel to the central axis of the long-focus collimating lens (8) corresponding to the sub-optical path;

the central axes of all the sub-optical path short-focus focusing lens groups (11) of the 2 groups of optical path systems are vertical to the surface of the tipping paper (12), and the focus falls on the surface of the tipping paper (12).

4. The dual laser tipping paper perforating optical system of claim 2, wherein: the first metal plane reflector (2) and the second metal plane reflector (3) of the main light path of the 2 groups of light path systems have an angle adjusting function, and the long-focus focusing lens (6) can move along the central axis direction of the lens;

the multi-surface prism (7) has an angle adjusting function and a three-dimensional coordinate axis adjusting function, and the reflection scanning angle of a single light splitting mirror surface is larger than the maximum included angle of n sets of sub-optical paths of each group of optical path systems and completely covers the n sets of sub-optical paths;

the first plane reflector (9) and the second plane reflector (10) of the sub-optical paths of the 2 groups of optical path systems have an angle adjusting function;

the second plane reflector (10) and the short-focus focusing lens group (11) of the sub-optical paths of the 2 groups of optical path systems have the function of moving along the central optical axis direction of the first plane reflector (9) and the second plane reflector (10), and the short-focus focusing lens group (11) can move along the central axis direction of the lens.

5. The use method of the dual-laser tipping paper punching optical system of claim 1 is realized, and is characterized in that: the using method comprises the following steps:

A. a CO2 laser 1 of a main optical path of the 2 groups of optical path systems emits a laser beam with an mrad-level divergence angle, the laser beam is continuously reflected by a first metal plane reflector 2 and a second metal plane reflector 3, and a reflected beam enters a beam expanding lens system formed by a beam expanding negative focal lens 4 and a beam expanding positive focal lens 5 to be expanded for the first time;

B. the expanded beam is focused by a long-focus focusing lens 6, so that a beam section near the focus of the focused beam falls on the beam splitting mirror surface of a multi-surface prism 7, when the multi-surface prism 7 rotates at a high speed, the beam splitting mirror reflects incident light and realizes beam scanning, and the scanning beam passes through n sets of sub-optical paths of each group of optical path systems successively;

C. in the process, when a scanning light beam passes through 1 set of sub-light paths, the long-focus collimating lens 8 corresponding to the sub-light paths expands for the second time to obtain a near-parallel scanning light beam, the near-parallel scanning light beam is reflected by the first plane reflecting mirror 9 and the second plane reflecting mirror 10, the reflected scanning light beam is finally focused by the short-focus focusing lens group 11, a focusing focus light spot falls on the surface of the tipping paper 12 to realize punching, and meanwhile, the tipping paper 12 moves at a high speed, so that the corresponding single-channel dense punching is realized.

Technical Field

The invention relates to the technical field of CO2 laser punching, in particular to a double-laser tipping paper punching optical system.

Background

The laser processing technology covers various laser processing technologies such as laser cutting, welding, quenching, cladding, punching, micromachining and the like, and utilizes the basic characteristic of interaction of laser and substances. The laser beam has the advantages of non-contact with the processing material, high processing speed, excellent quality and the like, so that the laser processing technology is a high and new technology without replacement.

Tipping paper has good exquisite outward appearance as cigarette filter tip surrounding layer, need carry out laser boring on it usually to improve air permeability and air dilution, reduce the internal tar yield of suction when the consumer smokes, thereby furthest reduces the harm of smoking to human health, improves the sense organ and experiences. And as a CO2 laser with the wavelength of about 10.6um, the laser is an irreplaceable laser in laser drilling of tipping paper due to the high absorptivity factor.

With the development and progress of the times, the requirements of consumers on the appearance of cigarettes are higher and higher, so that the manufacturing of the tipping paper cannot be influenced, and due to a plurality of complicated manufacturing processes, the thickness of the final tipping paper is thicker than before, and the absorption rate, the absorption rate or the thickness of the tipping paper to laser in laser drilling can be further influenced by a printing layer, a plating layer and the like on the surface, which means that the drilling process needs longer contact time of a laser beam and a material or higher use power to ensure the consistency of the hole pattern and reduce burrs and the coefficient of variation.

At present, although the CO2 laser has stabilized at kilowatt and kilowatt levels, from the use in the industrial market, the same high-power CO2 laser has beam quality and energy distribution mode differences between low-power light emission and high-power light emission, and generally, the low-power light emission is relatively preferred in both energy distribution mode and beam quality, which is particularly obvious in domestic lasers; similarly, the low power CO2 laser can achieve better energy distribution pattern and beam quality than the high power CO2 laser, which means that the combined efficiency and effect of 2 low power CO2 lasers with the same power is significantly higher than that of a single high power laser with 2 times power.

The influence on ultra-high-speed tipping paper laser punching is obvious, and a large amount of user side processing data show that the effect is improved by improving the punching air permeability variation coefficient, burrs and the like of the tipping paper by increasing the power, and the effect is far inferior to that of improving the contact time of the tipping paper and the laser.

However, in view of the optical path system of the current tipping paper puncher in the market, almost single laser, single group of main optical path and multiple sub optical paths are adopted for laser punching. Typically, there are 8, 16, 32 sub-optical path drilling systems in the market, and as the number of sub-optical paths increases, a multi-surface prism with different numbers of surfaces needs to be matched, and higher laser output power is required in laser drilling.

As is known, the quality of the holes punched on the tipping paper is judged by not only including the high and low air permeability containment, the air permeability variation coefficient, the hole pattern consistency, the hole burrs and the like, but also including the punching efficiency, the paper feeding speed, the number of holes in unit length, the laser energy utilization rate and the like, wherein the factors influence and conflict with each other and are limited.

For example, at a high paper feeding speed, the variation coefficient is increased, the consistency of hole patterns is deteriorated, more burrs are generated, and the like, and in order to improve the contradiction, one scheme is to reduce the number of sub-optical paths by reducing the scanning angle of the polygon prism, namely, the number of punching tracks is reduced, which is not beneficial to improving the punching efficiency in unit time; one scheme is to improve the light emitting power of the laser, and when the ultra-high speed multi-channel drilling is carried out, the improvement on the variation coefficient, particularly the single-channel low air permeability and the like is limited, but the laser energy utilization rate is reduced; one solution is to reduce the number of holes per unit length, which, although it helps to improve the above problems to some extent, reduces the toughness of the tipping paper in use to ensure that the corresponding holes of the air permeability are larger, and reduces the upper limit of the air permeability when high air permeability is achieved at multiple passes, thereby affecting the compatibility of high and low air permeability.

Disclosure of Invention

The invention aims to provide a double-laser tipping paper punching optical system to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a dual-laser tipping paper punching optical system comprises 2 groups of optical path systems, wherein the 2 groups of optical path systems share 1 piece of multi-surface prism; each group of optical path system comprises 1 set of main optical path consisting of a CO2 laser, a first metal plane reflector, a second metal plane reflector, a beam expanding negative focal lens, a beam expanding positive focal lens and a long focal focusing lens, and n sets of sub optical paths consisting of a long focal collimating lens, a first plane reflector, a second plane reflector and a short focal focusing lens; in addition, the paper also comprises tipping paper;

a first metal plane reflector and a second metal plane reflector are sequentially arranged in the CO2 laser of the main light path in the horizontal direction;

a beam expanding negative focal lens, a beam expanding positive focal lens, a long-focus focusing lens and a multi-surface prism are sequentially arranged obliquely below the second metal plane reflector of the main light path;

a long-focus collimating mirror and a first plane reflecting mirror of a sub-optical path are sequentially arranged obliquely above the multi-surface prism;

a second plane reflector is arranged in the horizontal direction of the first plane reflector of the sub-optical path;

and a short-focus focusing lens group and tipping paper are arranged below the second plane reflector of the sub-optical path.

Preferably, water cooling channels are arranged inside the first metal plane reflector and the second metal plane reflector of the main light path, and the light beam deflection angle is between 30 and 150 degrees;

the central axes of the beam expanding negative focal lens, the beam expanding positive focal lens and the long focal lens of the main light path are coaxial, and the lens materials are zinc selenide or germanium;

the beam expanding negative focal lens and the beam expanding positive focal lens of the main light path respectively comprise at least 1 lens, and the beam expanding multiple is in the range of 1-8 times;

the long-focus focusing lens of the main light path is a long-focus single lens, the focal length is between 200mm and 500mm, zinc selenide or germanium materials are adopted, and the lens types comprise plano-convex type, biconvex type and positive meniscus type;

the multi-surface prism is provided with 10-100 reflection beam splitting mirror surfaces, is a cylindrical multi-surface prism and is made of aluminum alloy;

the long-focus collimating lens of the sub-optical path is a long-focus single lens, the focal length is between 200mm and 500mm, zinc selenide or germanium materials are adopted, and the lens types comprise plano-convex type, biconvex type and positive meniscus type;

the central optical axes of the long-focus focusing lens of the main optical path and the long-focus collimating lens of the sub optical path are intersected on the surface of the light splitting mirror surface of the multi-surface prism;

the focal length of the long-focus focusing lens of the main optical path is less than or equal to that of the long-focus collimating lens of the sub optical path;

the specifications of the first plane reflector and the second plane reflector of the sub-optical path are the same, the reference beam deflection angles are both 90 degrees, and the materials comprise Si, SiC, copper and aluminum alloy;

the short-focus focusing lens group of the sub-optical path is a double-sheet type aberration eliminating lens group and zinc selenide or germanium material, and the focal length is in the range of 30mm-100 mm.

Preferably, the optical paths of the CO2 laser, the first metal plane reflector, the second metal plane reflector, the beam expanding negative focal lens, the beam expanding positive focal lens and the telephoto focal lens of the main optical paths of the 2 groups of optical path systems are the same in one-to-one correspondence, and the 2 sets of main optical paths are symmetrical with respect to the vertical symmetry plane of the central axis of the polygon prism;

n sets of sub-optical paths of the 2 groups of optical path systems meet the condition that n is more than or equal to 2, the optical distances between the long-focus collimating lenses of all the sub-optical paths and the first plane reflecting mirror are the same, the optical distances are symmetrical from the center to the edge relative to the vertical symmetrical plane of the central shaft of the multi-surface prism one by one, the optical distances between the multi-surface prism and the long-focus collimating lenses of all the sub-optical paths are the same, and the included angles of the central shafts between the adjacent long-focus collimating lenses are the same and are;

the first plane reflector and the second plane reflector of all the sub-optical paths of the 2 groups of optical path systems are connected with each other at the center and are vertical to the central axis of the long-focus collimating mirror corresponding to the sub-optical paths, and the central axis of the short-focus focusing mirror group is parallel to the central axis of the long-focus collimating mirror corresponding to the sub-optical paths;

the central axes of all the sub-optical path short-focus focusing lens groups of the 2 groups of optical path systems are vertical to the surface of the tipping paper, and the focus falls on the surface of the tipping paper.

Preferably, the first metal plane reflector and the second metal plane reflector of the main optical path of the 2 groups of optical path systems have an angle adjusting function, and the long-focus focusing lens can move along the central axis direction of the lens;

the multi-surface prism has an angle adjusting function and a three-dimensional coordinate axis adjusting function, and the reflection scanning angle of a single light splitting mirror surface is larger than the maximum included angle of n sets of sub-optical paths of each group of optical path systems and completely covers the n sets of sub-optical paths;

the first plane reflector and the second plane reflector of the sub-optical paths of the 2 groups of optical path systems have an angle adjusting function;

the second plane reflector and the short-focus focusing lens group of the sub-optical paths of the 2 groups of optical path systems have the function of moving along the central optical axis direction of the first plane reflector and the second plane reflector, and the short-focus focusing lens group can move along the central axis direction of the lenses.

Preferably, the using method comprises the following steps:

A. the CO2 laser of the main optical path of the 2 groups of optical path systems emits laser beams with an mrad-level divergence angle, the laser beams are continuously reflected by the first metal plane reflector and the second metal plane reflector, and reflected beams enter a beam expanding lens system formed by a beam expanding negative focal lens and a beam expanding positive focal lens to carry out primary beam expansion;

B. the expanded beam is focused by a long-focus focusing lens, so that a beam section near the focus of the focused beam falls on the beam splitting mirror surface of the multi-surface prism, when the multi-surface prism rotates at a high speed, the beam splitting mirror reflects incident light and realizes beam scanning, and the scanning beam passes through n sets of sub-optical paths of each set of optical path system successively;

C. in the process, when a scanning beam passes through each set of sub-optical path, the long-focus collimating lens corresponding to the sub-optical path performs secondary beam expansion to obtain a near-parallel scanning beam, the near-parallel scanning beam is reflected by the first plane reflecting mirror and the second plane reflecting mirror, the reflected scanning beam is finally focused by the short-focus focusing lens group, a focusing focus light spot falls on the surface of the tipping paper to realize punching, and meanwhile, the tipping paper moves at a high speed, so that corresponding single-channel dense punching is realized.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a double-laser tipping paper punching optical system, which is based on the quality characteristic of a CO2 laser beam, the high-speed rotation and light splitting characteristic of a polyhedral prism, the absorption characteristic of tipping paper to a CO2 laser beam and the optical characteristic of ultrahigh-speed laser scanning punching, and jointly emits light to punch holes through double lasers, so that punching burrs are improved under ultrahigh-speed paper feeding, the variation coefficient is reduced, the upper and lower limits of air permeability are widened, and the multi-channel punching efficiency of wide-width tipping paper is effectively improved.

2. Compared with a single high-power laser with the sum of power, the double laser provided by the invention can be better in energy distribution mode and beam quality, can be better suitable for laser drilling of ultra-high-speed tipping paper, and realizes the quality change of 1+1>2, thereby improving drilling burrs, reducing the coefficient of variation and the like.

3. The optical system provided by the invention can obtain smaller focusing spot size under good lens parameter matching and optical aberration optimization through 2 times of beam expansion, thereby ensuring that smaller punching size can be obtained, effectively widening the lower limit of air permeability through single-pass punching, improving punching burrs, ensuring pass consistency and reducing coefficient of variation.

4. The optical system provided by the invention is used for matching with ultrahigh-speed paper feeding punching, which means that focal spots need to swing along with paper feeding and can be realized by adjusting the defocusing amount of a focusing focal point of the long-focus focusing lens relative to the surface of the high-speed multi-face prism, in addition, the focal length of the long-focus focusing lens in front of the multi-face prism is longer, the size of the spot is smaller under the same defocusing amount relative to the short-focus focusing lens at the position, the size reduction of the multi-face prism is facilitated, the requirement on an air bearing is reduced, and the stability of an optical path is.

5. The double-main-light-path system provided by the invention shares one multi-surface prism, so that the cost of the multi-surface prism and the air bearing is greatly reduced, the difficulty of equipment is reduced, the 2n sub-light paths can realize more synchronous punching while the punching quality is ensured, the punching efficiency is improved, and meanwhile, the upper limit of high air permeability can be improved to a certain extent as the multi-hole dense arrangement can be used for realizing high air permeability.

6. The optical system provided by the invention has the advantages that under the same paper feeding speed and the same number of holes punched in unit length, compared with a single laser punching machine with the same number of punched holes, the number of surfaces of the polygon prism is increased, and although the scanning time of the single lens is the same, the single-pass punching time is substantially greatly prolonged due to the reduction of the number of sub-optical paths, so that the optical system is particularly favorable for punching Chinese cypress paper with thicker thickness, and simultaneously, punching burrs can be improved, the consistency of hole patterns is ensured, and the variation coefficient is reduced.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a schematic diagram of a dual-laser tipping paper punching optical system according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present invention provides a dual laser tipping paper punching optical system: the system comprises 2 groups of optical path systems, wherein the 2 groups of optical path systems share 1 multi-face prism 7; each group of optical path system comprises 1 set of main optical paths consisting of a CO2 laser 1, a first metal plane reflector 2, a second metal plane reflector 3, a beam expanding negative focal lens 4, a beam expanding positive focal lens 5 and a long-focus focusing lens 6, and n sets of sub optical paths consisting of a long-focus collimating lens 8, a first plane reflector 9, a second plane reflector 10 and a short-focus focusing lens group 11; in addition, the tipping paper 12 is also included;

the CO2 laser 1 of the main optical path is sequentially provided with a first metal plane reflector 2 and a second metal plane reflector 3 in the horizontal direction;

a beam expanding negative focal lens 4, a beam expanding positive focal lens 5, a long-focus focusing lens 6 and a multi-surface prism 7 are sequentially arranged obliquely below a second metal plane reflector 3 of the main light path;

a long-focus collimating mirror 8 and a first plane reflecting mirror 9 of a sub-optical path are sequentially arranged obliquely above the multi-surface prism 7;

a second plane reflector 10 is arranged in the horizontal direction of the first plane reflector 9 of the sub-optical path;

and a short-focus focusing mirror group 11 and tipping paper 12 are arranged below the second plane reflecting mirror 10 of the sub-optical path.

In the invention, water cooling channels are arranged inside the first metal plane reflector 2 and the second metal plane reflector 3 of the main light path, and the deflection angle of a light beam is between 30 and 150 degrees;

the central axes of the beam expanding negative focal lens 4, the beam expanding positive focal lens 5 and the long focal lens 6 of the main light path are coaxial, and the lens materials are zinc selenide or germanium;

the beam expanding negative focal lens 4 and the beam expanding positive focal lens 5 of the main light path respectively comprise at least 1 lens, and the beam expanding multiple is in the range of 1-8 times;

the long-focus focusing lens 6 of the main optical path is a long-focus single lens with the focal length of 200-500 mm, and is made of zinc selenide or germanium materials, wherein the lens types comprise plano-convex type, biconvex type and positive meniscus type;

the multi-face prism 7 is provided with 10-100 reflection beam splitting mirror faces, is a cylindrical multi-face prism and is made of aluminum alloy;

the long-focus collimating lens 8 of the sub-optical path is a long-focus single lens, the focal length is between 200mm and 500mm, zinc selenide or germanium materials are adopted, and the lens types comprise plano-convex type, biconvex type and positive meniscus type;

the central optical axes of the long-focus focusing lens 6 of the main optical path and the long-focus collimating lens 8 of the sub optical path are intersected on the surface of the light splitting mirror surface of the polygon prism 7;

the focal length of the long-focus focusing mirror 6 of the main light path is less than or equal to the focal length of the long-focus collimating mirror 8 of the sub light path;

the specifications of the first plane reflector 9 and the second plane reflector 10 of the sub-optical paths are the same, the reference beam deflection angles are both 90 degrees, and the materials comprise Si, SiC, copper and aluminum alloy;

the short-focus focusing lens group 11 of the sub-optical path is a double-sheet type aberration eliminating lens group made of zinc selenide or germanium materials, and the focal length is in the range of 30mm-100 mm.

In the optical path, the optical paths of the CO2 laser 1, the first metal plane reflector 2, the second metal plane reflector 3, the beam expanding negative focal lens 4, the beam expanding positive focal lens 5 and the telephoto focal lens 6 of the main optical paths of the 2 groups of optical path systems are the same in one-to-one correspondence, and the 2 sets of main optical paths are symmetrical relative to the vertical symmetrical plane of the central shaft of the multi-surface prism 7;

n sets of sub-optical paths of the 2 groups of optical path systems meet the condition that n is more than or equal to 2, the optical distances between the long-focus collimating lenses 8 of all the sub-optical paths and the first plane reflecting mirror 9 are the same, and are symmetrical from the center to the edge relative to the vertical symmetrical plane of the central shaft of the multi-surface prism 7 one by one, the optical distances between the multi-surface prism 7 and the long-focus collimating lenses 8 of all the sub-optical paths are the same, and the included angles of the central shafts between the adjacent long-focus collimating lenses 8 are the same and are all between;

the center of the first plane reflector 9 and the center of the second plane reflector 10 of all the sub-optical paths of the 2 groups of optical path systems are connected and vertical to the central axis of the long-focus collimating mirror 8 corresponding to the sub-optical paths, and the central axis of the short-focus focusing mirror group 11 is parallel to the central axis of the long-focus collimating mirror 8 corresponding to the sub-optical paths;

the central axes of all the sub-optical path short-focus focusing lens groups 11 of the 2 groups of optical path systems are vertical to the surface of the tipping paper 12, and the focal points fall on the surface of the tipping paper 12.

In the invention, the first metal plane reflector 2 and the second metal plane reflector 3 of the main optical path of the 2 groups of optical path systems have an angle adjusting function, and the long-focus focusing lens 6 can move along the central axis direction of the lens;

the multi-surface prism 7 has an angle adjusting function and a three-dimensional coordinate axis adjusting function, and the reflection scanning angle of a single light splitting mirror surface is larger than the maximum included angle of n sets of sub-optical paths of each group of optical path systems and completely covers the n sets of sub-optical paths;

the 2 groups of optical path system sub-optical paths comprise a first plane reflector 9 and a second plane reflector 10 which have an angle adjusting function;

the 2 groups of optical path system sub-optical path second plane reflecting mirrors 10 and the short-focus focusing mirror group 11 have the function of moving along the central optical axis direction of the first plane reflecting mirror 9 and the second plane reflecting mirror 10, and the short-focus focusing mirror group 11 can move along the central axis direction of the lens.

The working principle is as follows: the using method of the invention comprises the following steps:

A. a CO2 laser 1 of a main optical path of the 2 groups of optical path systems emits a laser beam with an mrad-level divergence angle, the laser beam is continuously reflected by a first metal plane reflector 2 and a second metal plane reflector 3, and a reflected beam enters a beam expanding lens system formed by a beam expanding negative focal lens 4 and a beam expanding positive focal lens 5 to be expanded for the first time;

B. the expanded beam is focused by a long-focus focusing lens 6, so that a beam section near the focus of the focused beam falls on the beam splitting mirror surface of a multi-surface prism 7, when the multi-surface prism 7 rotates at a high speed, the beam splitting mirror reflects incident light and realizes beam scanning, and the scanning beam passes through n sets of sub-optical paths of each group of optical path systems successively;

C. in the process, when a scanning light beam passes through 1 set of sub-light paths, the long-focus collimating lens 8 corresponding to the sub-light paths expands for the second time to obtain a near-parallel scanning light beam, the near-parallel scanning light beam is reflected by the first plane reflecting mirror 9 and the second plane reflecting mirror 10, the reflected scanning light beam is finally focused by the short-focus focusing lens group 11, a focusing focus light spot falls on the surface of the tipping paper 12 to realize punching, and meanwhile, the tipping paper 12 moves at a high speed, so that the corresponding single-channel dense punching is realized.

In the actual punching process, through the paper feed speed, the rotational frequency of polyhedral prism 7 is adjusted to the number of punching on the unit length, with it assorted, according to the needs of punching, realize through suitable adjustment long-focus focusing mirror 6 that the different defocus volume on the 7 beam splitting mirror surfaces of polyhedral prism is adjusted, adjust short-focus focusing mirror group 11 at last and realize focus position control, 11 focused beams of short-focus focusing mirror group are actually at the scanning motion this moment, thereby can satisfy circular punching, oval punching or even bar punching.

Besides, the second plane reflecting mirror 10 and the short-focus focusing mirror group 11 of each set of sub-optical paths are integrally adjusted along the optical axis direction, so that multiple channels can be punched simultaneously, and for the sub-optical paths without light-emitting punching, a light-blocking structure can be additionally designed on the sub-optical path module to block light.

In addition, due to the existence of actual machining errors, installation errors and the like, the optical path system can adjust the optical path through relevant adjusting mechanisms of the first metal plane reflecting mirror 2, the second metal plane reflecting mirror 3, the multi-surface prism 7, the first plane reflecting mirror 9 and the second plane reflecting mirror 10, so that a better punching effect is ensured.

In conclusion, the invention has novel structural design, is based on the quality characteristic of a CO2 laser beam, the high-speed rotation and light splitting characteristic of a multi-face prism, the absorption characteristic of the tipping paper to a CO2 laser beam and the optical characteristic of ultra-high-speed laser scanning punching, and jointly emits light and punches holes through a double laser, thereby being beneficial to improving punching burrs, reducing the variation coefficient, widening the upper limit and the lower limit of air permeability and effectively improving the multi-channel punching efficiency of the wide-width tipping paper under the condition of ultra-high-speed paper feeding.

The invention is not described in detail, but is well known to those skilled in the art.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.