Deformation wide screen lens applied to DLP projection

Abstract

The embodiment of the utility model discloses a deformable wide-screen lens applied to DLP projection. The deformable wide-screen lens comprises a deformable objective lens group, a projection objective lens group, a galvanometer, a light splitting device, protective glass and a DMD surface which are coaxially arranged and are sequentially arranged along a direction from a projection surface to the DMD surface, the deformable objective lens group comprises a first X cylindrical mirror, a second X cylindrical mirror, a first Y cylindrical mirror, a second Y cylindrical mirror and a third Y cylindrical mirror which are arranged in sequence; the projection objective lens group comprises a plurality of spherical lenses. By implementing the deformable wide-screen lens provided by the embodiment of the utility model, a 2.4: 1 wide-screen picture can be directly projected without additional cutting.

Description

Technical Field

[0001] The utility model relates to the technical field of wide-screen lenses, in particular to a deformable wide-screen lens applied to DLP projection. Background Art

[0002] DLP (Digital Light Processing) projection technology uses digital micro-mirror arrays to reflect light and forms images. With its excellent image quality, high contrast, low power consumption and the ability to project on a variety of display media, it is widely used in virtual reality / augmented reality glasses, smart home displays, large venues, cinemas, etc. Among digital projection display technologies, DLP has become the most widely used one.

[0003] Especially in the home theater and cinema market, DLP projection technology has become a mainstream solution. However, traditional DLP projection lenses usually produce a 16:9 aspect ratio, while movie projection often uses a widescreen ratio of 2.4:1 or even larger. To meet these needs, the conventional practice is to crop the picture to fit the widescreen ratio, but this will sacrifice pixels and reduce the picture resolution.

[0004] Therefore, it was necessary to design a new lens that could directly project a 2.4:1 widescreen image without additional cropping. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a distorted wide-screen lens applied to DLP projection.

[0006] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions: providing a anamorphic wide screen lens for DLP projection, comprising: an anamorphic objective lens group, a projection objective lens group, a galvanometer, a spectrometer, a protective glass and a DMD surface which are coaxially arranged and arranged in sequence from the projection surface to the DMD surface; the anamorphic objective lens group comprises a first X cylindrical mirror, a second X cylindrical mirror, a first Y cylindrical mirror, a second Y cylindrical mirror and a third Y cylindrical mirror which are arranged in sequence; the projection objective lens group comprises a plurality of spherical lenses.

[0007] A further technical solution is as follows: the first X-cylindrical mirror and the second X-cylindrical mirror have optical power in the X-axis direction, and the focal length of the first X-cylindrical mirror and the second X-cylindrical mirror in the Y direction is zero; the first Y-cylindrical mirror, the second Y-cylindrical mirror, and the third Y-cylindrical mirror have optical power in the Y-axis direction, and the focal length of the first Y-cylindrical mirror, the second Y-cylindrical mirror, and the third Y-cylindrical mirror in the X direction is zero.

[0008] Its further technical solution is: the projection objective lens group includes a first group lens, an aperture and a second group lens arranged in sequence; the first group lens includes a first spherical lens, a second spherical lens, a third spherical lens, a fourth spherical lens and a fifth spherical lens arranged in sequence; the second group lens includes a sixth spherical lens, a seventh spherical lens and an eighth spherical lens arranged in sequence; wherein the first spherical lens is located between the second spherical lens and the third Y cylindrical mirror; the eighth spherical lens is located between the seventh spherical lens and the galvanometer.

[0009] A further technical solution is: the ratio of the focal length of the second X-cylindrical mirror to the focal length of the first X-cylindrical mirror is -1.312.

[0010] A further technical solution is: the ratio of the focal length of the third Y cylindrical mirror to the combined focal length of the first Y cylindrical mirror and the second Y cylindrical mirror is -0.971.

[0011] A further technical solution is that the ratio of the focal length of the first spherical lens to the focal length of the first group of lenses of the objective lens system is approximately -1.029.

[0012] A further technical solution is: the ratio of the focal length formed by the combination of the second spherical lens and the third spherical lens to the focal length of the second group lens is 2.116.

[0013] A further technical solution is: the ratio of the focal length of the fourth spherical lens to the focal length of the first group of lenses is -2.837.

[0014] A further technical solution is: the ratio of the focal length of the fifth spherical lens to the focal length of the first group of lenses is 0.987.

[0015] A further technical solution is: the ratio of the focal length of the combination of the sixth spherical lens and the seventh spherical lens to the focal length of the second group of lenses is -0.84; the ratio of the focal length of the eighth spherical lens to the focal length of the second group of lenses is 0.645.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model is provided with a coaxially arranged anamorphic objective lens group and a projection objective lens group as well as a galvanometer, a spectroscopic device, a protective glass and a DMD surface, and the anamorphic objective lens group is placed in front, and is designed by using an XY cylindrical objective lens group combined with a spherical lens, so as to directly project a 2.4:1 wide screen image without the need for additional cropping.

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model Figure 1 ;

[0020] Figure 2 A schematic diagram of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model Figure 2 ;

[0021] Figure 3 A spatial frequency MTF diagram of an anamorphic widescreen lens applied to DLP projection provided by an embodiment of the utility model;

[0022] Figure 4 A diagram of the vertical axis chromatic aberration in the X direction of a anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model;

[0023] Figure 5 A Y-axis chromatic aberration diagram of a anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model;

[0024] Figure 6 A field curvature evaluation diagram of field curvature distortion in the X direction of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model;

[0025] Figure 7 A distortion evaluation diagram of field curvature distortion in the X direction of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model;

[0026] Figure 8 A field curvature evaluation diagram of the field curvature distortion in the Y direction of an anamorphic widescreen lens applied to DLP projection provided by an embodiment of the utility model;

[0027] Fig. 9 A distortion evaluation diagram of field curvature distortion in the Y direction of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model;

[0028] Fig.10 A point diagram of each field of view of an anamorphic widescreen lens applied to DLP projection provided by an embodiment of the utility model;

[0029] Description of the symbols in the figure:

[0030] S1, deformable objective lens group; S2, projection objective lens group; 9, galvanometer; 10, dichroic prism; 11, protective glass; C1, first X-cylindrical mirror; C2, second X-cylindrical mirror; C3, first Y-cylindrical mirror; C4, second Y-cylindrical mirror; C5, third Y-cylindrical mirror; P1, first spherical lens; G2, second spherical lens; G3, third spherical lens; G4, fourth spherical lens; G5, fifth spherical lens; G6, sixth spherical lens; G7, seventh spherical lens; GM8, eighth spherical lens. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0033] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0034] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] See also Figure 1 , Figure 1 A schematic diagram of an anamorphic widescreen lens for DLP projection provided by an embodiment of the utility model Figure 1 , can be used in the DLP projection process, can project a 2.4:1 aspect ratio, no need to cut. It has a series of advantages such as deformable projection frame, easy to manufacture, reasonable tolerance, short total length, low cost and high imaging quality, and has high practical application value.

[0036] See also Figure 1 and Figure 2The above-mentioned anamorphic wide-screen lens for DLP projection includes: an anamorphic objective lens group S1, a projection objective lens group S2, a galvanometer 9, a spectrometer 10, a protective glass 11 and a DMD surface, which are coaxially arranged and arranged in sequence from the projection surface to the DMD surface; the anamorphic objective lens group S1 includes a first X cylindrical mirror C1, a second X cylindrical mirror C2, a first Y cylindrical mirror C3, a second Y cylindrical mirror G4, and a third Y cylindrical mirror C5, which are arranged in sequence; the projection objective lens group S2 includes a plurality of spherical lenses.

[0037] The design uses an XY cylindrical lens group combined with a spherical lens, which can achieve the wide-frame projection (aspect ratio of 2.4:1) required by the film without cutting, and can achieve lossless playback of the film. The focal length of the anamorphic lens group S1 and the projection lens group S2 is reasonably distributed, and the total length of the lens is only 75mm, which is shorter than the total length of the traditional anamorphic wide-screen lens, smaller in size, and less distorted. The image quality is better than the traditional wide-screen lens, which can meet the requirements of projection. It has a series of advantages such as deformable projection frame, short total length, small projection ratio, high image quality, small distortion, reasonable tolerance, and low cost.

[0038] In one embodiment, see Figure 1 and Figure 2 , a coordinate system is established for explanation, with the direction of the lens optical axis as the Z axis, the first direction of the lens plane as the X axis, and the second direction as the Y axis.

[0039] See also Figure 1 and Figure 2 , the deformable objective lens group S1 is composed of 5 cylindrical mirrors, which are arranged in the direction from the projection plane to the DMD plane. The first X cylindrical mirror C1 and the second X cylindrical mirror C2 have optical power in the X-axis direction, and the focal length of the first X cylindrical mirror C1 and the second X cylindrical mirror C2 in the Y direction is zero; the first Y cylindrical mirror C3, the second Y cylindrical mirror G4, and the third Y cylindrical mirror C5 have optical power in the Y-axis direction, and the focal length of the first Y cylindrical mirror C3, the second Y cylindrical mirror G4, and the third Y cylindrical mirror C5 in the X direction is zero. By placing them in this way, the focal lengths of the deformable lens in the X and Y directions can be unequal, so as to change the aspect ratio of the projected image.

[0040] Specifically, adjusting the distance between the first X-cylindrical mirror C1 and the second X-cylindrical mirror C2 and their respective focal lengths can change the focal length of the anamorphic lens in the X direction, thereby changing the projection width of the anamorphic lens in the X direction. Adjusting the distance between the first Y-cylindrical mirror C3, the second Y-cylindrical mirror G4, and the third Y-cylindrical mirror C5 and their respective focal lengths can change the focal length of the anamorphic lens in the Y direction, thereby changing the projection width of the anamorphic lens in the Y direction. The projection width in the X direction / the projection width in the Y direction is the projection picture aspect ratio.

[0041] In one embodiment, see Figure 1 and Figure 2The projection lens group S2 is composed of 8 spherical lenses, which have the characteristics of rotational symmetry along the Z axis, have equal optical power in the first direction and the second direction, and are arranged in order from the projection surface to the DMD surface. The above-mentioned projection lens group S2 includes a first group lens, an aperture and a second group lens arranged in sequence; the first group lens includes a first spherical lens P1, a second spherical lens G2, a third spherical lens G3, a fourth spherical lens G4, and a fifth spherical lens G5 arranged in sequence; the second group lens includes a sixth spherical lens G6, a seventh spherical lens G7, and an eighth spherical lens GM8 arranged in sequence; wherein the first spherical lens P1 is located between the second spherical lens G2 and the third Y cylindrical mirror C5; the eighth spherical lens GM8 is located between the seventh spherical lens G7 and the galvanometer 9.

[0042] The spherical lens has the characteristic of rotational symmetry along the Z axis, and the optical power is equal in the first direction and the second direction. Therefore, the focal lengths in the X and Y axis directions are equal, and the aspect ratio of the projected frame is consistent with the aspect ratio of the DMD display area, which is 16:9; in the order from the projection surface to the DMD surface, the first spherical lens P1 is a plastic aspherical lens, the eighth spherical lens GM8 is a glass aspherical lens, and the rest are glass spherical lenses. The size of the aperture determines the F number of the anamorphic lens.

[0043] In this embodiment, the F number of the anamorphic lens is 1.75.

[0044] In one embodiment, the ratio of the focal length fxC2 of the second X-cylindrical mirror C2 to the focal length fxC1 of the first X-cylindrical mirror C1 is -1.312.

[0045] In one embodiment, the ratio of the focal length fyC5 of the third Y cylindrical mirror C5 to the combined focal length fyC3C4 of the first Y cylindrical mirror C3 and the second Y cylindrical mirror G4 is -0.971.

[0046] Specifically, the projection image aspect ratio = DMD aspect ratio * (fxC2 / (fxC1)) / (fyC5 / fyC3C4); if (fxC2 / (fxC1)) / (fyC5 / fyC3C4)>1, the projection image aspect ratio becomes larger, that is, wide screen projection; if (fxC2 / (fxC1)) / (fyC5 / fyC3C4)<1, the projection image aspect ratio becomes smaller.

[0047] In one embodiment, the ratio of the focal length fP1 of the first spherical lens P1 to the focal length f1 of the first lens group of the objective lens system is approximately -1.029.

[0048] In one embodiment, the ratio of the focal length fG6G7 formed by the combination of the second spherical lens G2 and the third spherical lens G3 to the focal length f2 of the second lens group is 2.116. The combination of the second spherical lens G2 and the third spherical lens G3 can be called a doublet lens G2G3.

[0049] In one embodiment, the ratio of the focal length fG4 of the fourth spherical lens G4 to the focal length f1 of the first lens group is -2.837; the ratio of the focal length fG5 of the fifth spherical lens G5 to the focal length f1 of the first lens group is 0.987.

[0050] In one embodiment, the ratio of the focal length fG6G7 of the sixth spherical lens G6 and the seventh spherical lens G7 combined to the focal length f2 of the second lens group is -0.84; the ratio of the focal length fGM8 of the eighth spherical lens GM8 to the focal length f2 of the second lens group is 0.645. The sixth spherical lens G6 and the seventh spherical lens G7 combined is called a double cemented lens G6G7.

[0051] According to the above relationship combination, the focal power of each lens can be reasonably allocated, which is beneficial to correct aberration and reduce tolerance sensitivity. The specific design parameters of the lens are shown in Table 1, and the aspheric coefficients of the plastic aspheric lens P1 and the eighth aspheric lens GM8 are shown in Table 2;

[0052] Table 1 Lens design parameters

[0053]

[0054]

[0055] Table 2 Aspheric lens P1, GM8 various order coefficients

[0056]

[0057] The projection lens obtained according to the specific parameters of each lens mentioned above is as follows: Figure 1 and Figure 2 The objective lens system 2DLayout is shown in the figure.

[0058] MTF (Modulation Transfer Function) is the most accurate and scientific lens evaluation standard. The vertical axis represents contrast, and the closer it is to 1, the better the lens imaging. The horizontal axis represents resolution, in units of line pairs per millimeter. Figure 3 As shown, the image source pixel size used in this embodiment is 5.4um, and the corresponding design resolution is 93 line pairs per millimeter. The projection lens generally requires that the MTF value of each field of view is at least 0.3 at the design resolution, and the MTF value of each field of view in this embodiment is above 0.6.

[0059] like Figure 4 and Figure 5 As shown, the ordinate is the image height field value, and the abscissa is the numerical value, in micrometers. Figure 4 and Figure 5 The color difference values ​​of each field of view between blue light, red light and green light (main wavelength) are plotted based on the main wavelength. The projection lens generally requires the color difference value to be within the size of one image source pixel. The vertical axis color difference of this embodiment is controlled within 2.8um, which is less than 0.65 pixel size (pixel size 4.5um).

[0060] like Figures 6 to 9 As shown, the ordinate represents the field of view angle of the lens. The abscissa of the field curvature diagram represents the magnitude of the field curvature value, and the abscissa of the distortion diagram represents the amount of distortion. Distortion is a very important indicator of a projection lens, and generally needs to be controlled within 3%, while TV distortion is required to be controlled within 1%; the distortion shape of the embodiment of the present application can make the TV distortion of the system of this embodiment very small, the optical distortion of the system of this embodiment is within 0.5%, and the TV distortion is within 0.4%, and the TV distortion of the system of this embodiment is very excellent.

[0061] See also Fig.10 The smaller the spot radius of each field of view, the better the imaging quality it represents. Generally, if the full field of view RMS is smaller than the pixel size (5.4um), it is an excellent level. In this embodiment, the full field of view RMS is less than 2.5um, which is a very excellent level.

[0062] In one embodiment, the anamorphic lens can realize anamorphic projection, and the projected image has an aspect ratio of 2.4: 1. The anamorphic lens has an anamorphic ratio of 1.35; and the anamorphic lens has an FNO of 1.75.

[0063] The DMD surface selected in this embodiment is a 0.23-inch DMD, and the bias rate of the DMD is 100%, which enables the projector to achieve the function of table projection.

[0064] The X cylindrical lens group in the anamorphic objective lens group S1 adopts the form of a negative focal length cylindrical lens + a positive focal length cylindrical lens, which is conducive to increasing the deformation ratio of the anamorphic lens.

[0065] In one embodiment, if Figure 1 As shown, the first lens in the projection objective lens group S2 is a meniscus lens, which is beneficial to the correction of the off-axis aberration of the system.

[0066] The anamorphic widescreen lens can achieve anamorphic widescreen projection, meeting the aspect ratio requirements for movie projection without cropping the picture; the projection ratio of the anamorphic widescreen lens is 1.25, which is relatively small, enabling a larger picture to be projected at a smaller distance, and is suitable for occasions with limited physical space such as home theaters; the MTF of the full field of view of the anamorphic widescreen lens is higher than 0.6, with excellent imaging quality; the distortion can reach within 0.5%, and the TV distortion is within 0.4%, with very excellent distortion correction. The power distribution of the anamorphic objective lens group S1 and the projection objective lens group S2 is reasonable, and the surface shape is convenient for processing, effectively reducing the difficulty of processing and assembly.

[0067] The anamorphic widescreen lens can meet the 100% OFFSET offset installation of the DMD, making the installation position of the projection device more flexible.

[0068] The anamorphic widescreen lens uses a front-mounted anamorphic objective lens group S1 to change the projection aspect ratio. The front-mounted anamorphic objective lens group S1 can be separately assembled in a lens barrel and combined with the projection objective lens group S2 when needed, making the lens installation more flexible.

[0069] In one embodiment, the anamorphic objective lens group S1 of the anamorphic widescreen lens applied to DLP projection satisfies the following conditional expressions: 1 < |fxC2 / (fxC1)| < 2; |fyC5 / fyC3C4| <= 1; where, fxC1 represents the focal length of the first X cylindrical lens C1, fxC2 represents the focal length of the second X cylindrical lens C2, and fyC3, fyC4, fyC5 represent the focal lengths of the first Y cylindrical lens C3, the second Y cylindrical lens G4, and the third Y cylindrical lens C5.

[0070] When 1 < |fxC2 / (fxC1)| < 2; |fyC5 / fyC3C4| <= 1, the anamorphic objective lens group S1 can achieve anamorphic widescreen projection and reasonably distributes the optical power of each lens.

[0071] In one embodiment, the projection objective lens group S2 of the anamorphic widescreen lens applied to DLP projection satisfies the following conditional expression: 1.5 < fp1G2 / fG3 < 2; where, fp1G2 represents the combined focal length of the first spherical lens P1 and the second spherical lens G2, and fG3 represents the focal length of the third spherical lens G3.

[0072] When 1.5 < fp1G2 / fG3 < 2, it can make the optical power distribution of the lens more conducive to aberration correction. When the value of fp1G2 / fG3 exceeds the upper limit, it will affect the ability of the first group of lenses to correct off-axis aberrations, resulting in a decrease in the resolution ability of the system; when the value of fp1G2 / fG3 exceeds the lower limit, it will affect the ability of the second group of lenses to correct coma and distortion, resulting in a decrease in the resolution ability of the system.

[0073] In this embodiment, the second spherical lens G2 and the third spherical lens G3 in the first lens group are glued together, which is beneficial to improving the chromatic aberration correction capability of the system and reducing the tolerance sensitivity of the system.

[0074] In this embodiment, the anamorphic widescreen lens used for DLP projection satisfies CRA<2, where CRA represents the incident angle of the main ray of the optical lens on the imaging surface. When CRA<2 is satisfied, it can be well matched with the DMD chip to achieve a good projection effect.

[0075] The anamorphic widescreen lens applied to DLP projection of this embodiment can achieve the wide-frame (aspect ratio of 2.4:1) projection required by the film without cropping, and can realize lossless playback of the film. It comprehensively considers and balances manufacturing, cost, image quality, projection brightness, etc., and has a series of advantages such as deformable projection frame, short total length, small projection ratio, high imaging quality, small distortion, reasonable tolerance, and low cost.

[0076] The above-mentioned anamorphic wide-screen lens for DLP projection is configured by setting a coaxially arranged anamorphic objective lens group S1 and a projection objective lens group S2, as well as a galvanometer 9, a spectrometer 10, a protective glass 11 and a DMD surface, and placing the anamorphic objective lens group S1 in front, and is designed by using an XY cylindrical objective lens group combined with a spherical lens, so as to directly project a 2.4:1 wide-screen image without the need for additional cropping.

[0077] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An anamorphic widescreen lens for DLP projection, characterized in that: include: A deformable objective lens group, a projection objective lens group, a galvanometer, a spectrometer, a protective glass and a DMD surface are coaxially arranged and arranged in sequence from the projection surface to the DMD surface; the deformable objective lens group includes a first X cylindrical mirror, a second X cylindrical mirror, a first Y cylindrical mirror, a second Y cylindrical mirror and a third Y cylindrical mirror which are arranged in sequence; the projection objective lens group includes a plurality of spherical lenses.

2. The anamorphic widescreen lens for DLP projection according to claim 1, characterized in that: The first X-cylindrical mirror and the second X-cylindrical mirror have optical power in the X-axis direction, and the focal length of the first X-cylindrical mirror and the second X-cylindrical mirror in the Y direction is zero; the first Y-cylindrical mirror, the second Y-cylindrical mirror, and the third Y-cylindrical mirror have optical power in the Y-axis direction, and the focal length of the first Y-cylindrical mirror, the second Y-cylindrical mirror, and the third Y-cylindrical mirror in the X direction is zero.

3. The anamorphic widescreen lens for DLP projection according to claim 2, characterized in that: The projection objective lens group includes a first group lens, an aperture and a second group lens arranged in sequence; the first group lens includes a first spherical lens, a second spherical lens, a third spherical lens, a fourth spherical lens and a fifth spherical lens arranged in sequence; the second group lens includes a sixth spherical lens, a seventh spherical lens and an eighth spherical lens arranged in sequence; wherein the first spherical lens is located between the second spherical lens and the third Y cylindrical mirror; the eighth spherical lens is located between the seventh spherical lens and the galvanometer.

4. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the second X-cylindrical mirror to the focal length of the first X-cylindrical mirror is -1.

312.

5. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the third Y cylindrical mirror to the combined focal length of the first Y cylindrical mirror and the second Y cylindrical mirror is -0.

971.

6. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the first spherical lens to the focal length of the first group of lenses of the objective lens system is approximately -1.

029.

7. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length formed by the combination of the second spherical lens and the third spherical lens to the focal length of the second lens group is 2.

116.

8. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the fourth spherical lens to the focal length of the first group of lenses is -2.

837.

9. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the fifth spherical lens to the focal length of the first group of lenses is 0.

987.

10. The anamorphic widescreen lens for DLP projection according to claim 3, characterized in that: The ratio of the focal length of the combination of the sixth spherical lens and the seventh spherical lens to the focal length of the second group of lenses is -0.84; the ratio of the focal length of the eighth spherical lens to the focal length of the second group of lenses is 0.645.

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