A light source device

Abstract

The utility model discloses a light source device, including light source, compound eye lens and dichroic mirror who arranges in proper order along the same horizontal axis, and dichroic mirror place is arranged light path structure, and compound eye lens and dichroic mirror between along the same horizontal axis is arranged with shaping lens. Increase a shaping lens group after compound eye lens, before dichroic mirror, carry out secondary shaping to the light that compound eye lens sends out, can to the effect that the single direction size of excitation light spot etc. proportional enlargement and reduction or change, through this setting, can reduce the number of compound eye lens open mould, reduce cost.

Description

Technical Field

[0001] This utility model relates to a light source device, and more particularly to a light source device and a projection system. Background Technology

[0002] Figure 1 This is a schematic diagram of a light source device in the prior art. 1' is the light source, emitting excitation light 101', which is typically a 455nm blue laser. 2' is a compound eye lens used to shape the excitation light 101'. 3' is a dichroic mirror used to separate the excitation light from the stimulated light. The light source 1', compound eye lens 2', and dichroic mirror 3' are arranged sequentially along the same horizontal axis. An optical path structure is arranged at the dichroic mirror 3'. (The diagram shows...) Figure 1 As shown, the optical path structure arranged at the dichroic mirror includes: a wavelength conversion device 5', a first converging lens group 4', a second converging lens group 6', and an optomechanical system 7' arranged sequentially along the same vertical axis at the position of the dichroic mirror 3'. The wavelength conversion device 5' and the first converging lens group 4' are located above the dichroic mirror 3', and the second converging lens 6' and the optomechanical system 7' are located below the dichroic mirror 3'.

[0003] Specifically, light source 1' emits excitation light 101', which passes through compound eye lens 2' to dichroic mirror 3', and is reflected by dichroic mirror 3' to first converging lens group 4'. First converging lens group 4' is used to converge the excitation light 101' to wavelength conversion device 5', and wavelength conversion device 5' further emits the generated stimulated light 102' to first converging lens group 4', such as... Figure 1 As shown, the emission direction of the stimulated light 102' is parallel to the incident direction of the stimulated light 101'. The stimulated light 102' is converged again to the dichroic mirror 3' via the first converging lens group 4'. At this time, the stimulated light 102' passes through the dichroic mirror to the second converging lens group 6', and is converged into the optomechanical system 7' via the second converging lens group 6'.

[0004] However, this optical path structure has the following problems: 1. Considering that different optomechanical systems 7' have different optical expansion amounts, the required excitation spot size to be converged on the wavelength conversion device 5' is different, which requires replacing different compound eye lenses 2' to achieve this; 2. Figure 2 This is a structural diagram of a compound eye lens, where the left is a front view and the right is a side view, as shown below. Figure 2 As shown, a compound eye lens is composed of many sub-lenses of the same size. Compound eye lenses require mold making, which is relatively expensive. If the size of the compound eye lens does not match the required size, it will cause a loss of the effective output luminous flux of the light source. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a light source device that addresses the shortcomings of the prior art. This light source device adds a shaping lens group after the compound eye lens and before the dichroic mirror to perform secondary shaping on the light emitted by the compound eye lens. This can proportionally magnify or reduce the size of the excitation spot or change the size of the spot in a single direction. Through this setting, the number of compound eye lens molds can be reduced, thereby reducing costs.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a light source device, including a light source, a compound eye lens and a dichroic mirror arranged sequentially along the same horizontal axis, an optical path structure arranged at the dichroic mirror, and a shaping lens arranged between the compound eye lens and the dichroic mirror along the same horizontal axis.

[0007] In one embodiment, the shaping lens group further comprises a first convex lens and a second convex lens arranged in sequence; or, it comprises a first convex cylindrical mirror and a second convex cylindrical mirror arranged in sequence.

[0008] Furthermore, a third shaping lens group is added before or after the shaping lens group along the same horizontal axis. The third shaping lens group consists of a third convex cylindrical mirror and a fourth convex cylindrical mirror arranged in sequence.

[0009] In one embodiment, the shaping lens group further comprises a convex lens and a concave lens arranged in sequence; or, it comprises a convex cylindrical mirror and a concave cylindrical mirror arranged in sequence.

[0010] Furthermore, a third shaping lens group 300 is added before or after the shaping lens group 100 along the same horizontal axis. The third shaping lens group consists of a convex cylindrical mirror and a concave cylindrical mirror arranged in sequence.

[0011] In one embodiment, the shaping lens group further comprises a concave lens and a convex lens arranged sequentially.

[0012] Furthermore, a second shaping lens group is arranged in front of the compound eye lens; the second shaping lens group consists of a second convex lens and a second concave lens arranged in sequence.

[0013] Furthermore, a third shaping lens group 300 is added before or after the shaping lens group 100 along the same horizontal axis. The third shaping lens group consists of a concave cylindrical mirror and a convex cylindrical mirror arranged in sequence.

[0014] In one embodiment, the shaping lens group further comprises a concave cylindrical mirror and a convex cylindrical mirror arranged sequentially.

[0015] Furthermore, a second shaping lens group is arranged in front of the compound eye lens; the second shaping lens group consists of a second convex lens and a second concave lens arranged in sequence; or, it consists of a second convex cylindrical lens and a second concave cylindrical lens arranged in sequence.

[0016] Furthermore, a third shaping lens group 300 is added before or after the shaping lens group 100 along the same horizontal axis. The third shaping lens group consists of a concave cylindrical mirror and a convex cylindrical mirror arranged in sequence.

[0017] This utility model has the following beneficial effects: 1. Compared with existing technologies, adding a shaping lens group after the compound eye lens and before the dichroic mirror can reshape the light emitted by the compound eye lens, which can proportionally magnify or reduce the size of the excitation spot or change the size of the spot in a single direction. This setting can reduce the number of molds required for the compound eye lens and reduce costs.

[0018] 2. To address the issues caused by the secondary reshaping of the reshaping lens group, a second reshaping lens group needs to be added before the compound eye lens. This second reshaping lens group and the reshaping lens group are symmetrically arranged on both sides of the compound eye lens. By using this symmetrically arranged second reshaping lens group before the compound eye lens, the beam width is first reduced, and then reshaping is performed, ensuring that the shaped beam completely reaches the dichroic mirror or is reflected to the converging lens, thus guaranteeing the light source efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a light source device in the prior art.

[0020] Figure 2 This is a schematic diagram of the structure of a compound eye lens in the prior art.

[0021] Figure 3 This is a schematic diagram of the structure of a light source device according to the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of embodiment 2 of the light source device of this utility model.

[0023] Figure 5 This is a schematic diagram of the optical path principle of Embodiment 2, in which... Figure 5 (a) is a schematic diagram of the optical path principle when the focal length of the first convex lens is smaller than that of the second convex lens. Figure 5 (b) is a schematic diagram of the optical path principle where the focal length of the first convex lens is greater than that of the second convex lens.

[0024] Figure 6 This is a schematic diagram of another embodiment of the light source device of this utility model, in Embodiment 2.

[0025] Figure 7This is a schematic diagram of another embodiment of the light source device of this utility model, in Embodiment 2.

[0026] Figure 8 This is a schematic diagram of the structure of embodiment 3 of the light source device of this utility model.

[0027] Figure 9 This is a schematic diagram of another embodiment of the light source device of this utility model, in Embodiment 3.

[0028] Figure 10 This is a schematic diagram of another embodiment of the light source device of this utility model, in Embodiment 3.

[0029] Figure 11 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 3.

[0030] Figure 12 This is a schematic diagram of the structure of embodiment 4 of the light source device of this utility model.

[0031] Figure 13 This is a schematic diagram of another embodiment of the light source device of this utility model in Embodiment 4.

[0032] Figure 14 This is a schematic diagram of another embodiment of the light source device of this utility model in Embodiment 4.

[0033] Figure 15 This is a schematic diagram of the structure of embodiment 5 of the light source device of this utility model.

[0034] Figure 16 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0035] Figure 17 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0036] Figure 18 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0037] Figure 19 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0038] Figure 20 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0039] Figure 21This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0040] Figure 22 This is a schematic diagram of another embodiment of the light source device of this utility model, in embodiment 5.

[0041] Among them are: 1. Light source; 2. Compound eye lens; 3. Dichroic mirror; 4. First converging lens group; 5. Wavelength conversion device; 6. Second converging lens group; 7. Optomechanical system; 8. Concave lens; 9. Convex lens; 10. Second convex lens; 11. Second concave lens; 12. First convex lens; 13. Second convex lens; 14. Convex cylindrical mirror; 15. Concave cylindrical mirror; 101. Excitation light; 102. Excited light; 100. Shaping lens group; 200. Second shaping lens group; 300. Third shaping lens group; 8'. Concave cylindrical mirror; 9'. Convex cylindrical mirror; 12'. Third convex cylindrical mirror; 13'. Fourth convex cylindrical mirror. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0043] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0044] like Figure 3 As shown, a light source device includes a light source 1, a compound eye lens 2, and a dichroic mirror 3 arranged sequentially along the same horizontal axis, with an optical path structure arranged at the dichroic mirror.

[0045] Among them, light source 1 is used to emit excitation light 101.

[0046] Among them, the compound eye lens 2 is used to shape the excitation light 101.

[0047] Among them, the dichroic mirror 3 is used to separate the excitation light and the stimulated light.

[0048] Furthermore, a shaping lens group 100 is arranged along the same horizontal axis between the compound eye lens and the dichroic mirror.

[0049] Compared with existing technologies, this invention adds a shaping lens group between the compound eye lens and the dichroic mirror. This shaping lens group is used to reshape the light emitted from the compound eye lens to adjust the size of the excitation spot. By adding the shaping lens group, the size of the compound eye lens is perfectly matched with the required size. This design reduces the number of molds required for the compound eye lens and lowers costs.

[0050] The present application will be further described in detail below with reference to the embodiments and accompanying drawings: Example 1

[0051] like Figure 3 As shown, the optical path structure arranged at the dichroic mirror includes: a wavelength conversion device 5, a first converging lens group 4, a second converging lens group 6, and an optomechanical system 7 arranged sequentially along the same vertical axis at the position of the dichroic mirror 3. The wavelength conversion device 5 and the first converging lens group 4 are located above the dichroic mirror 3, and the second converging lens 6 and the optomechanical system 7 are located below the dichroic mirror 3.

[0052] In this optical path structure, a wavelength conversion device 5 and a first converging lens group 4 are arranged sequentially above the dichroic mirror 3 along the same vertical axis, and a second converging lens group 6 and an optomechanical system 7 are arranged sequentially below the dichroic mirror 3 along the same vertical axis.

[0053] Specifically, light source 1 emits excitation light 101, which passes through compound eye lens 2. After being shaped by compound eye lens 2, the excitation light 101 reaches shaping lens group 100. After secondary shaping by shaping lens group 100, its spot size is adjusted. The second-shaped excitation light 101 reaches dichroic mirror 3 and is reflected by dichroic mirror 3 to first converging lens group 4. First converging lens group 4 is used to converge the excitation light 101 to wavelength conversion device 5. Wavelength conversion device 5 further emits the generated stimulated light 102 to first converging lens group 4, such as... Figure 3 As shown, the incident directions of the stimulated light 102 and the excitation light 101 are parallel. The stimulated light 102 is converged again to the dichroic mirror 3 through the first converging lens group 4. At this time, the stimulated light 102 passes through the dichroic mirror to the second converging lens group 6, and is converged into the optomechanical system 7 through the second converging lens group 6. Example 2

[0054] like Figure 4 As shown, the shaping lens group 100 consists of two convex lenses, used to reshape the light emitted from the compound eye lens to adjust the size of the excitation spot. The shaping lens group 100 consists of a first convex lens 12 and a second convex lens 13 arranged sequentially.

[0055] Specifically, the optical path principle of the first convex lens 12 and the second convex lens 13 is as follows: Figure 5 As shown, where Figure 5(a) is a schematic diagram of the optical path principle when the focal length of the first convex lens is smaller than that of the second convex lens. Figure 5 (b) is a schematic diagram of the optical path principle where the focal length of the first convex lens is greater than that of the second convex lens.

[0056] like Figure 5 As shown in (a), when the focal length of the first convex lens 12 is smaller than that of the second convex lens 13, the beam becomes wider, the divergence angle becomes smaller, and the excitation spot also becomes smaller. That is, this combination can reduce the excitation spot shaped by the compound eye lens 5. The smaller the ratio of the focal lengths of the two lenses, the smaller the excitation spot becomes.

[0057] like Figure 5 As shown in (b), when the focal length of the first convex lens 12 is greater than that of the second convex lens 13, the beam narrows, the divergence angle increases, and the excitation spot also becomes larger. That is, this combination can enlarge the excitation spot shaped by the compound eye lens 5. The larger the ratio of the focal lengths of the two lenses, the larger the excitation spot becomes.

[0058] It should be noted that when the shaping lens group 100 consists of two concave lenses, it cannot further shape the optical path, and the combination is invalid.

[0059] In this embodiment, optionally, as Figure 6-7 As shown, a convex cylindrical mirror can be used to replace a convex lens. That is, the shaping lens group 100 consists of two convex cylindrical mirrors 12' and 13', which are used to reshape the light coming out of the compound eye and change the size of the light spot in one direction. Example 3

[0060] The shaping lens group 100 consists of a convex lens 9 and a concave lens 8, and is used to reshape the light coming out of the compound eye to adjust the size of the excitation spot.

[0061] Specifically, the shaping lens group 100 consists of a concave lens 8 and a convex lens 9 arranged in sequence; or, the shaping lens group 100 consists of a convex lens and a concave lens arranged in sequence.

[0062] like Figure 8 As shown, the shaping lens group 100 consists of a concave lens 8 and a convex lens 9 arranged in sequence, that is, the concave lens is in front and the convex lens is behind, arranged in sequence. The shaping lens group is composed of concave lens 8 and convex lens 9. The concave lens 8 is arranged between the compound eye lens 2 and the convex lens 9. This combination can reduce the excitation spot shaped by the compound eye lens 5.

[0063] like Figure 9As shown, the shaping lens group 100 consists of a convex lens 9 and a concave lens 8 arranged in sequence, that is, the convex lens is in front and the concave lens is behind, arranged in sequence. The shaping lens group is composed of convex lens 9 and concave lens 8. The convex lens 9 is arranged between the compound eye lens 2 and the concave lens 8. This combination can enlarge the excitation spot shaped by the compound eye lens 5.

[0064] Compared with existing technologies, adding a shaping lens group after the compound eye lens and before the dichroic mirror can reshape the light emitted by the compound eye lens, which can proportionally magnify and reduce the excitation spot. This setting can reduce the number of compound eye lens molds and lower costs.

[0065] In this embodiment, optionally, as Figure 10-11 As shown, a convex cylindrical mirror can be used to replace a convex lens, and a concave cylindrical mirror can be used to replace a concave lens. That is, the shaping lens group 100 consists of a convex cylindrical mirror 9' and a concave cylindrical mirror 8', which is used to reshape the light coming out of the compound eye and change the size of the light spot in one direction.

[0066] like Figure 10 As shown, the shaping lens group 100 consists of a concave cylindrical lens 8' and a convex cylindrical lens 9' arranged sequentially. Figure 11 As shown, the shaping lens group 100 consists of a convex cylindrical mirror 9' and a concave cylindrical mirror 8' arranged in sequence. Example 4

[0067] like Figure 12 As shown, the shaping lens group 100 consists of a concave lens 8 and a convex lens 9 arranged in sequence. The second shaping lens group 200 is added in front of the compound eye lens 2. The second shaping lens group 200 includes a second convex lens 10 and a second concave lens 11 arranged in sequence along the same horizontal axis.

[0068] Specifically, because the excitation light, after being shaped by the compound eye lens 5, undergoes secondary shaping by the shaping lens group 100, the beam width increases. This may result in the widened beam not fully reaching the dichroic mirror 3, or not being fully reflected to the converging lens 4 after passing through the dichroic mirror 3. This leads to excitation light loss and reduced light source efficiency. To solve the problem caused by the secondary shaping by the shaping lens group 100, a second shaping lens group 200 needs to be added before the compound eye lens. The second shaping lens group 200 and the shaping lens group 100 are arranged on both sides of the compound eye lens 2. Figure 8As shown, the shaping lens group 100 located after the compound eye lens consists of a concave lens and a convex lens arranged sequentially. Correspondingly, the second shaping lens group 200 located before the compound eye lens consists of a second convex lens 10 and a second concave lens 11 arranged sequentially. The second shaping lens group 200, symmetrically arranged before the compound eye lens, first reduces the beam width and then shapes it, ensuring that the shaped beam reaches the dichroic mirror 3 or is reflected to the converging lens 4, thus guaranteeing the light source efficiency.

[0069] In this embodiment, optionally, as Figure 13 As shown, a convex cylindrical mirror can be used to replace a convex lens, and a concave cylindrical mirror can be used to replace a concave lens. That is, the shaping lens group 100 consists of a concave cylindrical mirror 8' and a convex cylindrical mirror 9' arranged in sequence. The second shaping lens group 200 is added in front of the compound eye lens 2. The second shaping lens group 200 includes a second convex lens 10 and a second concave lens 11 arranged in sequence along the same horizontal axis.

[0070] In this embodiment, optionally, as Figure 14 As shown, a convex cylindrical mirror can be used to replace a convex lens, and a concave cylindrical mirror can be used to replace a concave lens. That is, the shaping lens group 100 consists of a concave cylindrical mirror 8' and a convex cylindrical mirror 9' arranged in sequence. The second shaping lens group 200 is added in front of the compound eye lens 2. The second shaping lens group 200 includes a second convex cylindrical mirror 10' and a second concave cylindrical mirror 11' arranged in sequence along the same horizontal axis.

[0071] like Figure 13-14 As shown, by arranging the second shaping lens group 200 before the compound eye lens, the beam width is reduced first, which creates space for the subsequent shaping lens group 100 to shape the beam by increasing the beam width. This achieves the goal of changing the size of the excitation spot while ensuring the efficiency of the light source. Example 5

[0072] A third shaping lens group 300 is added along the same horizontal axis between the compound eye lens 5 and the shaping lens group 100. The third shaping lens group 300 is a combination of cylindrical lenses. This arrangement is used to perform secondary shaping of the light emitted from the compound eye. When the light reaches the third shaping lens group, it changes the size of the light spot in one direction. The light then reaches the shaping lens group 100, which proportionally magnifies and reduces the excitation light spot.

[0073] In one embodiment, optionally, as Figure 15 As shown, the shaping lens group 100 consists of a convex lens 9 and a concave lens 8 arranged in sequence. The third shaping lens group is arranged between the compound eye lens 5 and the shaping lens group 100. The third shaping lens group consists of a convex cylindrical lens 14 and a concave cylindrical lens 15 arranged in sequence.

[0074] In one embodiment, optionally, as Figure 16 As shown, the positions of the shaping lens group 100 and the third shaping lens group 300 can also be interchanged to achieve the same shaping effect.

[0075] In one embodiment, optionally, as Figure 17 As shown, the shaping lens group 100 consists of a concave lens 8 and a convex lens 9 arranged in sequence. The third shaping lens group is arranged between the compound eye lens 5 and the shaping lens group 100. The third shaping lens group consists of a concave cylindrical lens 15 and a convex cylindrical lens 14 arranged in sequence.

[0076] In one embodiment, optionally, as Figure 18 As shown, the positions of the shaping lens group 100 and the third shaping lens group 300 can also be interchanged to achieve the same shaping effect.

[0077] In one embodiment, optionally, as Figures 19-20 As shown, the shaping lens group 100 consists of a concave lens 8 and a convex lens 9 arranged sequentially, and the third shaping lens group consists of a concave cylindrical lens 15 and a convex cylindrical lens 14 arranged sequentially. The shaping lens group 100 is positioned before or after the third shaping lens group 300. Furthermore, correspondingly, a second shaping lens group 200, which reduces the beam width, is added before the compound eye lens. The second shaping lens group 200 consists of a second convex lens 10 and a second concave lens 11 arranged sequentially. By further correspondingly arranging the second shaping lens group 200, a beam width reduction is achieved before the compound eye lens, reserving space for the shaping lens after the compound eye lens and ensuring efficiency.

[0078] In one embodiment, optionally, as Figure 21-22 As shown, the reshaping lens group 100 consists of a first convex lens 12 and a second convex lens 13 arranged sequentially. The third reshaping lens group is arranged between the compound eye lens 5 and the reshaping lens group 100, and consists of a third convex cylindrical lens 12' and a fourth convex cylindrical lens 13' arranged sequentially. Similarly, the reshaping lens group 100 and the third reshaping lens group 300 can be interchanged to achieve the same reshaping effect. Example 6

[0079] This utility model also provides a projection system, which includes the light source device in any one of the embodiments 1-5.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A light source device, comprising a light source, a compound eye lens, and a dichroic mirror arranged sequentially along the same horizontal axis, wherein an optical path structure is arranged at the dichroic mirror, characterized in that: A shaping lens is arranged along the same horizontal axis between the compound eye lens and the dichroic mirror to proportionally magnify or reduce the size of the excitation spot or change the size of the spot in a single direction.

2. The light source device according to claim 1, characterized in that: The shaping lens group consists of a first convex lens and a second convex lens arranged in sequence; or, it consists of a first convex cylindrical mirror and a second convex cylindrical mirror arranged in sequence.

3. The light source device according to claim 1, characterized in that: The shaping lens group consists of a convex lens and a concave lens arranged in sequence; or, it consists of a convex cylindrical mirror and a concave cylindrical mirror arranged in sequence.

4. The light source device according to claim 1, characterized in that: The shaping lens group consists of a concave lens and a convex lens arranged in sequence.

5. The light source device according to claim 4, characterized in that: A second shaping lens group is arranged in front of the compound eye lens; the second shaping lens group consists of a second convex lens and a second concave lens arranged in sequence.

6. The light source device according to claim 1, characterized in that: The shaping lens group consists of a concave cylindrical mirror and a convex cylindrical mirror arranged in sequence.

7. The light source device according to claim 6, characterized in that: A second shaping lens group is arranged in front of the compound eye lens; the second shaping lens group consists of a second convex lens and a second concave lens arranged in sequence; or, it consists of a second convex cylindrical lens and a second concave cylindrical lens arranged in sequence.

8. The light source device according to claim 2, characterized in that: A third shaping lens group (300) is added before or after the shaping lens group (100) along the same horizontal axis. The third shaping lens group consists of a third convex cylindrical mirror and a fourth convex cylindrical mirror arranged in sequence.

9. The light source device according to claim 3, characterized in that: A third shaping lens group (300) is added along the same horizontal axis before or after the shaping lens group (100). The third shaping lens group consists of a convex cylindrical mirror and a concave cylindrical mirror arranged in sequence.

10. The light source device according to claim 4 or 5, characterized in that: A third shaping lens group (300) is added before or after the shaping lens group (100) along the same horizontal axis. The third shaping lens group consists of a concave cylindrical mirror and a convex cylindrical mirror arranged in sequence.

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