A multi-effect imaging optical path system

Abstract

The utility model relates to a kind of multi-effect imaging optical path systems, the emergent light of light source 11 first passes through first light collecting element 121, is guided to second light collecting lens 122 by first light collecting element 121, and the light-emitting angle of emergent light that is emitted by condenser lens set 12 is 35 °;Condenser lens set 12 passes through collimating emergent light, so that more light passes through aperture diaphragm 3, to improve the luminous flux of passing through imaging lens assembly 2;The emergent light that passes through aperture diaphragm 3 again sequentially passes through focusing lens 21 and magnifying lens 22, focusing lens 21 and magnifying lens 22 can continuously change system focal length in the range of 64mm to 135mm by moving towards or relative, to realize the continuous change of field of view angle FOV in the range of 25 ° to 50 °;Since focusing lens 21 and magnifying lens 22 are all aspherical lens, the imaging quality of the light spot formed by the emergent light that is emitted from imaging lens assembly 2 is high, and light spot distortion degree is ≤3.3%.

Description

Technical Field

[0001] This utility model relates to the field of stage lighting technology, and more specifically, to a multi-effect imaging optical path system. Background Technology

[0002] Imaging lights, also known as shaping lights, use a condenser lens to focus a beam of light. The beam angle can be varied, and the imaged spot can be cut into various shapes such as square, rhombus, triangle, and trapezoid by a cutting blade.

[0003] Existing imaging lamp lenses typically consist of a condenser lens group and a focusing lens group. The condenser lens group usually comprises three spherical condenser lenses, while the focusing lens group consists of three cemented spherical focusing lenses. Because both the condenser and focusing lens groups in the imaging lamp contain spherical lenses, the edges of the light spots formed by the emitted light from the imaging lamp are often unclear or distorted. The color mixing effect of the condenser and focusing lens groups is also poor, and the light spots formed by the emitted light from the imaging lamp are prone to rainbow edges or color blocks in the center of the light spot. Furthermore, the focusing lens in the focusing lens group is relatively heavy, which can easily cause jamming during continuous focusing, and its complex structure makes it difficult to install. Utility Model Content

[0004] This invention provides a multi-effect imaging optical path system to solve the problems mentioned in the background art.

[0005] A multi-effect imaging optical path system, comprising: The light source assembly includes a light source and a condenser lens group. The light source includes multiple monochromatic LEDs distributed in the same circular area. The condenser lens group includes a first condensing element and a second condensing lens with positive optical power, which are located sequentially in the light-emitting direction. The condenser lens group is used to make the light-emitting angle of the light emitted through the condenser lens group θ, where θ≤35°. The imaging lens assembly includes a focusing lens with positive optical power and a magnifying lens with positive optical power, which are located sequentially in the light-emitting direction. The focusing lens is an aspherical biconvex lens and the magnifying lens is an aspherical concave-convex lens. The focusing lens and the magnifying lens are translated relative to or towards each other along the light-emitting direction to achieve continuous adjustment of the system's focal length. The aperture stop is located between the condenser lens group and the imaging lens assembly; The light source assembly, aperture stop, and imaging lens assembly are arranged sequentially and alternately along the light emission direction.

[0006] As a further improvement of this utility model, the system focal length f of the imaging optical path system varies continuously within the range of 64mm to 135mm.

[0007] As a further improvement to this invention, the aperture coefficient of the imaging optical path system is... 1.66.

[0008] As a further improvement of this utility model, the light-incident surface of the focusing lens is aspherical, and the light-exiting surface of the focusing lens is spherical; the light-incident surface of the magnifying lens is spherical, and the light-exiting surface of the magnifying lens is aspherical.

[0009] As a further improvement of this utility model, the radius of curvature of the light-emitting surface of the focusing lens is 103mm, and the radius of curvature of the light-incident surface of the magnifying lens is 1734mm.

[0010] As a further improvement of this utility model, the field of view (FOV) of the imaging optical path system is 25°≤FOV≤50°.

[0011] As a further improvement of this utility model, the first light-concentrating element is a regular polygonal light guide tube, and the light-emitting surface of the light guide tube is located within the projection range of the light-incident surface of the second light-concentrating lens in the direction of the light guide tube.

[0012] As a further improvement of this utility model, the light guide tube includes six light guide units, and the sides of the six light guide units are closely attached to each other to form a regular hexagonal truncated pyramidal light guide tube. The light-incident surface area of ​​the light guide tube is smaller than the light-exit surface area of ​​the light guide tube.

[0013] As a further improvement of this utility model, the second condensing lens is a spherical plano-convex lens with its convex surface facing the light source, and the radius of curvature of the light-incident surface of the second condensing lens is 91mm.

[0014] As a further improvement of this utility model, the first condensing element is an aspherical first condensing lens, and both the first condensing lens and the second condensing lens are plano-convex lenses. The light-emitting surface of the first condensing lens is aspherical, the radius of curvature of the light-emitting surface of the second condensing lens is 59mm, and the aperture of the first condensing lens is smaller than that of the second condensing lens.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, the condenser lens group adopts a combination of a first condenser element and a second condenser lens, which can effectively reduce the divergence angle of the outgoing light emitted from the second condenser lens and improve the color mixing effect of the outgoing light emitted through the condenser lens group; the imaging lens assembly adopts an aspherical focusing lens and a magnifying lens, which can effectively improve the imaging effect of the outgoing light and form a light spot with clear edges and uniform color. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the imaging optical path system of Embodiment 1.

[0017] Figure 2 This is a schematic diagram of the monochrome LED arrangement of the light source in Example 1.

[0018] Figure 3The image shows the field curvature distortion of the imaging optical path system in Example 1 at 25° and 50° field angles.

[0019] Figure 4 The image optical path system of Example 1 is shown in the lateral fan pattern at a field of view of 25° and 50°.

[0020] Figure 5 The diagram shows the imaging optical path system of Example 1 at 25° and 50° field of view.

[0021] Figure 6 This is a schematic diagram of the imaging optical path system in Example 2.

[0022] In the figure: 1-Light source assembly; 11-Light source; 111-Monochrome LED bead; 12-Condenser lens assembly; 121-First condenser element; 122-Second condenser lens; 2-Imaging lens assembly; 21-Focusing lens; 22-Magnifying lens; 3-Aperture stop. Detailed Implementation

[0023] Example

[0024] Combined with appendix Figure 1 To be continued Figure 4 A multi-effect imaging optical path system includes a light source assembly 1, an aperture stop 3, and an imaging lens assembly 2. The light source assembly 1, the aperture stop 3, and the imaging lens assembly 2 are arranged sequentially and alternately along the light emission direction.

[0025] The light source assembly 1 includes a light source 11 and a condenser lens assembly 12. The light source 11 includes a plurality of monochromatic LED beads 111 distributed in the same circular area. The light emission colors of the monochromatic LED beads 111 include, but are not limited to, any one or a combination of red (R), green (G), blue (B), amber (A), lemon yellow (L), and cyan (C). The distance between any two adjacent monochromatic LED beads 111 is equal, and the plurality of monochromatic LED beads 111 are evenly spaced in the circular area. The condenser lens assembly 12 includes a first condensing element 121 and a second condensing lens 122 with positive optical power, which are located sequentially in the light emission direction. The condenser lens assembly 12 is used to make the light emission angle of the light emitted through the condenser lens assembly 12 θ. The light incident surface area of ​​the first condensing element 121 is slightly larger than the area of ​​the circular area, and most of the light emitted from the light source 11 can enter the first condensing element 121. The emitted light from the light source 11 first enters the first condenser element 121, and is then guided by the first condenser element 121 to the second condenser lens 122. The emission angle θ of the emitted light from the second condenser lens 122 is ≤35°, and the color mixing effect of the emitted light is also improved. When θ≤35°, most of the emitted light can pass through the aperture stop 3. When θ>35°, most of the emitted light cannot enter the aperture stop 3 due to the excessive emission angle, resulting in a decrease in the light flux of the imaging lens assembly 2 and affecting the brightness of the light spot formed by the emitted light. That is, the condenser lens group 12 can make the emitted light from the light source more collimated, so that most of the emitted light can pass through the aperture stop 3 and enter the imaging lens assembly 2. The multiple refractions of the emitted light by the condenser lens group 12 can improve the color mixing effect of the emitted light.

[0026] The imaging lens assembly 2 includes a focusing lens 21 with positive optical power and a magnifying lens 22 with positive optical power, located sequentially in the light-emitting direction. The focusing lens 21 is an aspherical biconvex lens, and the magnifying lens 22 is an aspherical concave-convex lens. The focusing lens 21 and the magnifying lens 22 are translated relative to or towards each other along the light-emitting direction to achieve continuous adjustment of the system's focal length. Both the focusing lens 21 and the magnifying lens 22 are aspherical lenses, and the combination of the two aspherical lenses is beneficial to improving image quality. The curvature of the aspherical lens can be precisely and continuously changed according to its radial distance, thereby specifically correcting the aberrations caused by the outgoing light rays at different incident heights, ensuring that the outgoing light rays can converge to the ideal focal point, making the light spot formed by the outgoing light rays clearer and reducing the degree of light spot distortion; the outgoing light passing through the aperture stop 3... The light rays first enter the focusing lens 21 and then exit through the magnifying lens 22. Both the light-emitting and light-receiving surfaces of the focusing lens 21 are convex, which can converge the light rays entering the focusing lens 21 and reduce the light-emitting angle of the light rays. The light-receiving surface of the magnifying lens 22 is concave, and the light-emitting surface of the magnifying lens 22 is convex, which helps to make the light rays exiting through the magnifying lens 22 more collimated and to form a more uniform light spot. Furthermore, the size of the light spot formed by the light rays can be adjusted when the focusing lens 21 and the magnifying lens 22 move relative to or towards each other. When the focusing lens 21 and the magnifying lens 22 move towards each other, the light spot formed by the light rays exiting through the imaging lens assembly 2 is larger. Similarly, when the focusing lens 21 and the magnifying lens 22 move relative to each other, the light spot formed by the light rays exiting through the imaging lens assembly 2 is smaller.

[0027] In this embodiment, the light emission angle of the light emitted through the condenser lens group 12 is 35°. At this time, the color mixing effect of the light spot formed by the emitted light is better, and the space occupied by the first condenser element 121 and the second condenser lens 122 is small, which can save space; the distortion degree of the light spot formed by the light emitted through the imaging lens assembly 2 is ≤3.3%.

[0028] The beneficial effects of this embodiment are that the condenser lens group 12 can effectively reduce the light emission angle of the emitted light passing through the condenser lens group 12 and improve the color mixing effect of the emitted light; the two aspherical lenses in the imaging lens assembly 2 can effectively improve the imaging effect of the emitted light and control the distortion of the light spot within the range of ≤3.3%.

[0029] As a new implementation method, combined with the appendix Figure 1The system focal length f of the imaging optical path system continuously varies within the range of 64mm to 135mm. The focusing lens 21 and magnifying lens 22 in the imaging lens assembly can move continuously within this range. When the focusing lens 21 and magnifying lens 22 move towards each other, the closer the system focal length is to 64mm, the larger the exit angle of the emitted light after passing through the imaging lens assembly 2, and the larger the light spot formed by the emitted light. When the focusing lens 21 and magnifying lens 22 move relative to each other, the closer the system focal length is to 135mm, the smaller the exit angle of the emitted light after passing through the imaging lens assembly 2, and the smaller the light spot formed by the emitted light. The beneficial effect of this embodiment is that the imaging lens assembly 2 can move continuously within the system focal length. By adjusting the relative position of the focusing lens 21 and magnifying lens 22, the exit angle of the emitted light is changed, thereby achieving continuous adjustment of the light spot size.

[0030] As a new implementation method, combined with the appendix Figure 1 The aperture coefficient of the imaging optical path system =1.66. In this embodiment, the exit angle of the emitted light after passing through the condenser lens group 12 is θ, and θ = 35°; as those skilled in the art will understand, the aperture coefficient is the ratio between the system focal length and the entrance pupil diameter, and its value is related to the exit angle θ of the condenser lens group, used to represent the strength of the light transmission capability of the optical system; conventional condenser lens groups usually consist of three condenser lenses to enable the emitted light to exit at a smaller exit angle and form a more uniform light spot; however, in this embodiment, the condenser lens group 12 has at least one condenser lens, and the exit angle of the emitted light and the uniformity of the formed light spot can be consistent with those of conventional condenser lens groups. The beneficial effect of this embodiment is that when When the value is 1.66, it can ensure that the imaging optical path system has sufficient light flux, and the emitted light rays form a uniform, bright and clear light spot after passing through the imaging optical path system.

[0031] As a new implementation method, combined with the appendix Figure 1 To be continued Figure 5The light-incident surface of the focusing lens 21 is aspherical, and the light-exiting surface of the focusing lens 21 is spherical; the light-incident surface of the magnifying lens 22 is spherical, and the light-exiting surface of the magnifying lens 22 is aspherical. When the outgoing light enters through the incident surface of the focusing lens 21, the aspherical incident surface of the focusing lens 21 corrects the outgoing light, eliminating spherical aberration. This ensures that outgoing light from different incident heights, after being refracted by the focusing lens 21, ideally points to the same focal area. The exiting surface of the focusing lens 21 is spherical, and the optical characteristics of a sphere are constant and predictable, ensuring that no new complex optical distortions occur during focusing. The spot quality remains highly consistent and stable throughout the focusing stroke. The magnifying lens 22 is used to change the beam size and also magnifies the aberrations present in the entire imaging optical path system. The aspherical exiting surface of the magnifying lens 22, by precisely controlling the light exit angle, effectively suppresses off-axis aberrations such as coma and astigmatism caused by edge rays while magnifying the beam, ensuring that the magnified spot remains uniform, clear, sharp, and free from blurring or distortion. Furthermore, as the emitted light passes through the imaging optical path system, aberrations accumulate gradually. The emitting surface of the magnifying lens 22 is aspherical, which can ultimately correct the accumulated aberrations generated by all preceding optical elements. The two aspherical surfaces on the focusing lens 21 and the magnifying lens 22 are sufficient to correct the spherical aberration and other aberrations of the imaging optical path system. Additionally, both the focusing lens 21 and the magnifying lens 22 have one spherical surface, which helps reduce production costs. The beneficial effect of this embodiment is that the aspherical incident surface of the focusing lens 21 and the aspherical emitting surface of the magnifying lens 22 are sufficient to correct the spherical aberration and other aberrations of the imaging optical path system, enabling the imaging lens assembly 2 of this invention to achieve the same effect as a traditional three-group imaging system. Compared to a traditional three-group imaging system, the imaging lens assembly structure of this embodiment is simpler and more convenient.

[0032] As a new implementation method, combined with the appendix Figure 1 The field of view (FOV) of the imaging optical path system satisfies 25° ≤ FOV ≤ 50°. As will be understood by those skilled in the art, the size of the field of view is related to the focal length of the optical system; the system focal length determines the field of view of the optical system. The longer the system focal length, the smaller the field of view; conversely, the shorter the system focal length, the larger the field of view. When the system focal length f = 64mm, the field of view (FOV) = 50°. At this time, the divergence of the outgoing light rays through the imaging optical path system is relatively high, i.e., the illumination range is wide, and the outgoing light rays can form a uniform large spot. When the system focal length f = 135mm, the field of view (FOV) = 25°. At this time, the illumination range of the outgoing light rays through the imaging optical path system is narrower, and the outgoing light rays can form a clear and bright small spot. The beneficial effect of this embodiment is that by adjusting the system focal length f to change the field of view (FOV), the spot size can be adjusted at the same projection distance.

[0033] As a new implementation method, combined with the appendix Figure 1The first focusing element 121 is a regular polygonal light guide tube, and the light-emitting surface of the light guide tube is located within the projection range of the light-incident surface of the second focusing lens 122 in the direction of the light guide tube. The light guide tube is located in the light-emitting direction of the light source 11. After the light emitted from the light source 11 enters the light guide tube, the light emitted is collimated and reflected by the inner surface of the light guide tube. The light emitted from the light guide tube enters the second focusing lens 122 with its convex surface facing the light source 11, which helps to make the light emitted after passing through the focusing lens group 12 more collimated and the color mixing effect better. Since the light-emitting surface of the light guide tube is smaller than the light-incident surface of the second focusing lens 122, and the distance between the light guide tube and the second focusing lens 122 is small, all the light emitted by the light guide tube can enter the second focusing lens 122, reducing light loss. The beneficial effect of this embodiment is that the first focusing element 121 is a regular polygonal light guide tube, and the reflection of the inner surface of the light guide tube can achieve collimation and color mixing of the outgoing light, making the light spot formed by the outgoing light more uniform in color.

[0034] As a new implementation method, combined with the appendix Figure 1 The light guide tube includes six light guide units 1211. The sides of the six light guide units 1211 are closely attached to each other to form a regular hexagonal truncated pyramidal light guide tube. The light-incident surface area of ​​the light guide tube is smaller than the light-outceasing surface area of ​​the light guide tube. The light guide unit 1211 is a trapezoidal lens, and the sides of six light guide units 1211 are closely attached to each other to form a truncated pyramidal light guide tube. Compared with a straight cylindrical light guide tube, the truncated pyramidal light guide tube has better light focusing and color mixing effects. The light-incident surface and the light-exit surface of the light guide tube are both regular hexagons. The light-incident surface of the light guide tube is larger than the light-emitting surface of the light source 11, and the light guide tube is in close contact with the light source 11. All the light emitted from the light source 11 can enter the light guide tube. After multiple reflections on the inner surface of the light guide tube, color mixing and light focusing are achieved. It can be understood that the number of light guide units 1211 can also be eight. The more light guide units 1211 there are, the better the color mixing effect. However, it is necessary to increase the height of the light guide unit 1211 to increase the number of reflections of the emitted light and ensure color mixing uniformity. The beneficial effect of this embodiment is that the six light guide units 1211 form a light guide tube, which can improve the color mixing effect of the emitted light and avoid the light guide unit 1211 being too tall, resulting in an excessively large total optical length.

[0035] As a new implementation method, combined with the appendix Figure 1The second condenser lens 122 is a spherical plano-convex lens with its convex surface facing the light source 11, and its incident surface has a radius of curvature of 91 mm. In this embodiment, the first condenser element 121 is a truncated pyramidal light guide tube surrounded by six light guide units 1211, and the area of ​​the incident surface of the light guide tube is smaller than the area of ​​the emitting surface of the light guide tube. The second condenser lens 122 is adjacent to the emitting surface of the light guide tube, and the incident surface of the second condenser lens 122 is located in the emitting direction of the light guide tube, which is beneficial for all the emitted light rays through the light guide tube to enter the second condenser lens 122. When the incident surface of the second condenser lens 122 is curved and the radius of curvature is 91 mm, the combination of the light guide tube and the second condenser lens 122 can make the emitted light rays through the condenser lens group 12 more collimated and the color mixing effect better, while ensuring that the emitted light rays through the condenser lens group 12 can pass through the aperture stop 3. The beneficial effect of this embodiment is that the cooperation between the second condenser lens 122 and the light guide tube makes the emitted light more collimated and the color mixing more uniform, thereby ensuring that most of the light passes through the aperture stop 3 and improving the light throughput of the imaging lens assembly 2. Example

[0036] In Embodiment 1, the first focusing element is a light guide tube; that is, Embodiment 1 uses a combination of a light guide tube and a second focusing lens 122 to achieve collimation of the emitted light. Embodiment 2 differs from Embodiment 1 in that, in Embodiment 2, the first focusing element is a first focusing lens; that is, Embodiment 2 uses a combination of a first focusing lens and a second focusing lens 122 to achieve collimation of the emitted light. The second focusing lens 122 is combined with... Figure 6The first condensing element 121 is an aspherical first condensing lens. Both the first and second condensing lenses 122 are plano-convex lenses. The light-emitting surface of the first condensing lens is aspherical, and the radius of curvature of the light-emitting surface of the second condensing lens 122 is 59 mm. The aperture of the light-emitting surface of the second condensing lens 122 is smaller than the aperture of the light-incident surface. There is a certain distance between the first condensing lens and the light source 11. The light-incident surface of the first condensing lens is much larger than the area of ​​the light-emitting surface of the light source 11. By adjusting the distance between the light source 11 and the first condensing lens, a light source 11 with a larger light-emitting surface can be accommodated, thereby increasing the light flux entering the imaging optical path system. The aperture of the second condensing lens 122 is larger than that of the first condensing lens, and the distance between the first and second condensing lenses 122 is small. Therefore, all the outgoing light rays emitted from the first condensing lens can enter the second condensing lens 122, thereby reducing light loss. In this embodiment, the first condensing lens and the focusing lens... Both mirror 21 and magnifying lens 22 are aspherical lenses. Aspherical lenses can compensate for refraction deviations of light at different heights and eliminate spherical aberration and coma. Compared with embodiment one, in this embodiment, the light guide tube is replaced with an aspherical first condensing lens. Therefore, the imaging optical path system in this embodiment has better imaging quality and lower light spot distortion. As those skilled in the art will understand, the smaller the radius of curvature of the second condensing lens 122, the stronger its focusing effect on light. When the radius of curvature of the light-emitting surface of the second condensing lens 122 is 59mm, the exit angle of the light emitted from the second condensing lens 122 is 35°. The beneficial effect of this embodiment is that it increases the number of aspherical lenses, thereby effectively improving imaging quality and reducing light spot distortion.

[0037] The working principle of the technical solution of this utility model is explained as follows, as shown in the appendix. Figure 1 To be continued Figure 6 As shown, the light source 11, condenser lens group 12, aperture stop 3, and imaging lens assembly 2 are arranged sequentially and alternately along the light emission direction. The emitted light from the light source 11 first passes through the first condenser element 121, and is guided by the first condenser element 121 to the second condenser lens 122. The light emission angle of the emitted light from the condenser lens group 12 is 35°. The condenser lens group 12 collimates the emitted light, allowing more light to pass through the aperture stop 3, thereby increasing the light throughput through the imaging lens assembly 2. 3. The outgoing light rays then pass through the focusing lens 21 and the magnifying lens 22 in sequence. The focusing lens 21 and the magnifying lens 22 can continuously change the system focal length within the range of 64mm to 135mm by moving towards or relative to each other, so as to achieve continuous change of the field of view (FOV) within the range of 25° to 50°. Since both the focusing lens 21 and the magnifying lens 22 are aspherical lenses, the light spot formed by the outgoing light rays emitted from the imaging lens assembly 2 has high imaging quality and the light spot distortion degree is ≤3.3%.

Claims

1. A multi-effect imaging optical path system, characterized in that, include: The light source assembly includes a light source and a condenser lens group. The light source includes multiple monochromatic LEDs distributed in the same circular area. The condenser lens group includes a first condensing element and a second condensing lens with positive optical power, which are located sequentially in the light-emitting direction. The condenser lens group is used to make the light-emitting angle of the light emitted through the condenser lens group θ, where θ≤35°. An imaging lens assembly includes a focusing lens with positive optical power and a magnifying lens with positive optical power, which are located sequentially in the light-emitting direction. The focusing lens is an aspherical biconvex lens and the magnifying lens is an aspherical concave-convex lens. The focusing lens and the magnifying lens are respectively translated relative to or towards each other in the light-emitting direction to achieve continuous adjustment of the system focal length. The aperture stop is located between the condenser lens group and the imaging lens assembly; The light source assembly, aperture stop, and imaging lens assembly are arranged sequentially and at intervals along the light emission direction.

2. The multi-effect imaging optical path system according to claim 1, characterized in that, The system focal length f of the imaging optical path system varies continuously from 64mm to 135mm.

3. The multi-effect imaging optical path system according to claim 2, characterized in that, Aperture coefficient of imaging optical path system 1.

66.

4. The multi-effect imaging optical path system according to claim 1, characterized in that, The light-incident surface of the focusing lens is aspherical, and the light-exiting surface of the focusing lens is spherical; the light-incident surface of the magnifying lens is spherical, and the light-exiting surface of the magnifying lens is aspherical.

5. A multi-effect imaging optical path system according to claim 4, characterized in that, The radius of curvature of the light-emitting surface of the focusing lens is 103 mm, and the radius of curvature of the light-receiving surface of the magnifying lens is 1734 mm.

6. The multi-effect imaging optical path system according to claim 2, characterized in that, The field of view (FOV) of the imaging optical path system is 25°≤FOV≤50°.

7. The multi-effect imaging optical path system according to claim 1, characterized in that, The first light-concentrating element is a regular polygonal light guide tube, and the light-emitting surface of the light guide tube is located within the projection range of the light-incident surface of the second light-concentrating lens in the direction of the light guide tube.

8. A multi-effect imaging optical path system according to claim 7, characterized in that, The light guide tube includes six light guide units, and the sides of the six light guide units are closely attached to each other to form a regular hexagonal truncated pyramidal light guide tube. The light-incident surface area of ​​the light guide tube is smaller than the light-exit surface area of ​​the light guide tube.

9. A multi-effect imaging optical path system according to claim 7, characterized in that, The second condenser lens is a spherical plano-convex lens with its convex surface facing the light source, and the radius of curvature of the incident surface of the second condenser lens is 91 mm.

10. A multi-effect imaging optical path system according to claim 1, characterized in that, The first condensing element is an aspherical first condensing lens. Both the first and second condensing lenses are plano-convex lenses. The light-emitting surface of the first condensing lens is aspherical, and the radius of curvature of the light-emitting surface of the second condensing lens is 59 mm. The aperture of the first condensing lens is smaller than that of the second condensing lens.

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