Optical projection lens and projection equipment

Abstract

The utility model provides an optical projection lens and projection equipment, and relates to the technical field of optical imaging. The optical projection lens sequentially comprises a first lens group, a second lens group, a diaphragm, a third lens group, a fourth lens group and a display chip from a magnification side to a reduction side, the focal power of the first lens group is negative, the focal power of the second lens group is positive, the focal power of the third lens group is negative, and the focal power of the fourth lens group is positive; wherein the clear aperture of the optical projection lens meets the following condition: F # 2.0 to F # 2.4. Furthermore, the positive or negative focal power of the first lens group, the second lens group, the third lens group and the fourth lens group is distributed, a diaphragm and a display chip are matched for use, and the clear aperture of the optical projection lens is limited. Therefore, the optical projection lens provided by the utility model has the advantages of high resolution, wide temperature range, small chromatic aberration, small global distortion and the like, and the performance of projection equipment is improved.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and more specifically, to an optical projection lens and a projection device. Background Art

[0002] Projectors, due to their small size and light weight, are widely used in offices, education, and home applications. With the development of the projection market and the continuous innovation of projection technology, the performance requirements for projection equipment are increasing. For example, requirements for resolution, color shading, extreme operating conditions, global distortion, and other parameters are gradually increasing. Therefore, providing high-performance projection equipment has become a pressing issue for current researchers. Utility Model Content

[0003] In view of this, the present application provides an optical projection lens and a projection device, which effectively solve the technical problems existing in the prior art. The optical projection lens has the advantages of high resolution, wide temperature range, small chromatic aberration, and small global distortion, thereby improving the performance of the projection device.

[0004] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0005] An optical projection lens, comprising, from a magnification side to a reduction side, a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and a display chip;

[0006] The first lens group has a negative optical power, the second lens group has a positive optical power, the third lens group has a negative optical power, and the fourth lens group has a positive optical power;

[0007] The optical aperture of the projection lens satisfies the following conditions:

[0008] F#2.0-F#2.4.

[0009] Optionally, the focal length of the first lens group is F1, and the focal length of the optical projection lens is F0, wherein a ratio F1 / F0 of the focal length F1 of the first lens group to the focal length F0 of the optical projection lens satisfies the following condition:

[0010] Greater than or equal to -20 and less than or equal to -10.

[0011] Optionally, from the magnification side to the reduction side, the first lens group includes, in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens.

[0012] Optionally, the focal length of the second lens group is F2, and the focal length of the optical projection lens is F0, wherein a ratio F2 / F0 of the focal length F2 of the second lens group to the focal length F0 of the optical projection lens satisfies the following condition:

[0013] Greater than or equal to 3.5 and less than or equal to 8.5.

[0014] Optionally, from the magnification side to the reduction side, the second lens group includes, in sequence: an eleventh lens and a twelfth lens.

[0015] Optionally, the focal length of the third lens group is F3, and the focal length of the optical projection lens is F0, wherein the ratio F3 / F0 of the focal length F3 of the third lens group to the focal length F0 of the optical projection lens satisfies the following condition:

[0016] Greater than or equal to -6 and less than or equal to -1.5.

[0017] Optionally, from the magnification side to the reduction side, the third lens group includes, in order: a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens and an eighteenth lens.

[0018] Optionally, the focal length of the fourth lens group is F4, and the focal length of the optical projection lens is F0, wherein a ratio F4 / F0 of the focal length F4 of the fourth lens group to the focal length F0 of the optical projection lens satisfies the following condition:

[0019] Greater than or equal to 0.8 and less than or equal to 2.5.

[0020] Optionally, the fourth lens group includes a nineteenth lens.

[0021] Based on the same inventive concept, the present application also provides a projection device, which includes the above-mentioned optical projection lens.

[0022] Compared with the existing technology, the technical solution provided by this application has at least the following advantages:

[0023] The present application provides an optical projection lens and a projection device. The optical projection lens comprises, from the magnification side to the reduction side, a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and a display chip. The first lens group has a negative focal power, the second lens group has a positive focal power, the third lens group has a negative focal power, and the fourth lens group has a positive focal power. The optical projection lens has a clear aperture that satisfies the following conditions: F#2.0-F#2.4. Furthermore, by allocating positive or negative focal powers to the first, second, third, and fourth lens groups, combining the aperture with the display chip, and limiting the clear aperture of the optical projection lens, the optical projection lens provided by the present application has advantages such as high resolution, wide temperature range, low chromatic aberration, and low global distortion, thereby improving the performance of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0025] Figure 1 A schematic structural diagram of an optical projection lens provided in an embodiment of the present application;

[0026] Figure 2 A schematic structural diagram of another optical projection lens provided in an embodiment of the present application;

[0027] Figure 3 A schematic structural diagram of another optical projection lens provided in an embodiment of the present application;

[0028] Figure 4 A schematic structural diagram of another optical projection lens provided in an embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of another optical projection lens provided in an embodiment of the present application;

[0030] Figure 6 A schematic structural diagram of another optical projection lens provided in an embodiment of the present application;

[0031] Figure 7 This is an MTF diagram of the field transfer function of an optical projection lens provided in an embodiment of the present application at room temperature;

[0032] Figure 8 Field curvature and distortion diagrams of each field of view of an optical projection lens provided in an embodiment of the present application;

[0033] Figure 9 A vertical axis chromatic aberration diagram of an optical projection lens provided in an embodiment of the present application;

[0034] Figure 10 This is an MTF diagram of each field of view transfer function of an optical projection lens provided in an embodiment of the present application at a high temperature of 85°C before compensation;

[0035] Figure 11 This is an MTF diagram of each field transfer function of an optical projection lens provided in an embodiment of the present application at a -20°C low-temperature barrel before compensation. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] As mentioned in the background, projectors are widely used in offices, education, and home projection due to their small size and light weight. With the development of the projection market and the continuous innovation of projection technology, the performance requirements for projection equipment are increasing. For example, requirements for various parameters such as resolution, color shading, extreme operating conditions, and global distortion are gradually increasing. Therefore, providing high-performance projection equipment has become a pressing issue for current researchers.

[0038] Based on this, the embodiments of the present application provide an optical projection lens and a projection device, which effectively solve the technical problems existing in the prior art. The optical projection lens has the advantages of high resolution, wide temperature range, small chromatic aberration, and small global distortion, thereby improving the performance of the projection device.

[0039] To achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows, specifically combined with Figures 1 to 11 The technical solutions provided in the embodiments of the present application are described in detail.

[0040] refer to Figure 11 is a schematic structural diagram of an optical projection lens provided in an embodiment of the present application, wherein the optical projection lens provided in the embodiment of the present application includes, in order from the magnification side to the reduction side in direction X: a first lens group 100, a second lens group 200, an aperture 500, a third lens group 300, a fourth lens group 400, and a display chip 600; the first lens group 100 has a negative focal power, the second lens group 200 has a positive focal power, the third lens group 300 has a negative focal power, and the fourth lens group 400 has a positive focal power; wherein the clear aperture of the optical projection lens satisfies the following condition: F#2.0-F#2.4.

[0041] In some embodiments, the display chip 600 provided in the embodiments of the present application is a prism display chip, which may include a digital micromirror device (DMD) chip, a reflective projection display (Liquid Crystal On Silicon, LCOS) chip, etc.

[0042] As can be seen from the above, the technical solution provided by the embodiment of the present application, through the distribution of positive or negative focal power of the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400, and the combination of the aperture 500 and the display chip 600, and limiting the optical projection lens, the optical projection lens provided by the embodiment of the present application has high resolution, and its global resolution MTF can be greater than 0.4. In addition, the optical projection lens provided by the embodiment of the present application can be used in a wide temperature range without the problem of defocus, and the temperature range can reach greater than or equal to -20°C and less than or equal to 100°C, allowing the optical projection lens to be used under extreme conditions, thereby increasing the applicability of the projection device. In addition, the optical projection lens provided by the embodiment of the present application has the advantage of low chromatic aberration, with the RGB primary color difference less than 0.4 pixel, and the image and text of the projection device have no color fringing problem. In addition, the optical projection lens provided by the embodiment of the present application also has the advantage of low global distortion, with the global distortion less than 0.2%, improving the performance of the projection device.

[0043] In some embodiments, the focal length of the first lens group 100 provided in the embodiments of the present application is F1, and the focal length of the optical projection lens is F0, wherein the ratio F1 / F0 of the focal length F1 of the first lens group 100 to the focal length F0 of the optical projection lens satisfies the following conditions: greater than or equal to -20 and less than or equal to -10. It can be understood that the optical focal length of the first lens group 100 is negative. In the embodiments of the present application, the ratio F1 / F0 of the focal length F1 of the first lens group 100 to the focal length F0 of the optical projection lens is set to a range of -20 to -10 to cooperate with the remaining lens groups, the aperture 500 and the display chip 600 to improve the performance of the projection device. Reference Figure 2 , which is a schematic structural diagram of another optical projection lens provided in an embodiment of the present application. In the optical projection lens provided in an embodiment of the present application, in the direction X from the magnification side to the reduction side, the first lens group 100 sequentially includes: a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, and a tenth lens 110. It can be seen that the first lens group 100 provided in an embodiment of the present application can achieve the condition that the F1 / F0 ratio is greater than or equal to -20 and less than or equal to -10 through ten lenses.

[0044] Continue to refer Figure 2 As shown, the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 provided in the embodiment of the present application have the same optical axis, that is, the optical axis of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, the eighth lens 108, the ninth lens 109, and the tenth lens 110 are the same. In the direction X from the magnification side to the reduction side, the front lens surface of the first lens 101 is convex, and the rear lens surface of the first lens 101 is flat or convex; the front lens surface of the second lens 102 is convex, and the rear lens surface of the second lens 102 is concave; the front lens surface of the third lens 103 is flat or convex, and the rear lens surface of the third lens 103 is concave; the front lens surface of the fourth lens 104 is concave, and the rear lens surface of the fourth lens 104 is concave; the front lens surface of the fifth lens 105 is convex, and the rear lens surface of the fifth lens 105 is concave. The rear lens surface of the sixth lens element 106 is a convex surface; the front lens surface of the seventh lens element 107 is a convex surface, and the rear lens surface of the seventh lens 107 is a convex surface; the front lens surface of the eighth lens 108 is a plane or a convex surface, and the rear lens surface of the eighth lens 108 is a convex surface; the front lens surface of the ninth lens 109 is a concave surface, and the rear lens surface of the ninth lens 109 is a convex surface; the front lens surface of the tenth lens 110 is a convex surface, and the rear lens surface of the tenth lens 110 is a convex surface.

[0045] It should be noted that the embodiments of this application provide Figure 2 The number of lenses and lens surface shape included in the illustrated first lens group 100 is only one of all structures of the first lens group 100 applicable to the present application. In other embodiments of the present application, the number of lenses and lens surface shape included in the first lens group 100 may also be other situations, and this application does not impose specific limitations on this.

[0046] In some embodiments, the focal length of the second lens group 200 provided in the embodiments of the present application is F2, and the focal length of the optical projection lens is F0, wherein the ratio F2 / F0 of the focal length F2 of the second lens group 200 to the focal length F0 of the optical projection lens satisfies the following conditions: greater than or equal to 3.5 and less than or equal to 8.5. It can be understood that the optical focal length of the second lens group 200 is positive. In the embodiments of the present application, the ratio F2 / F0 of the focal length F2 of the second lens group 200 to the focal length F0 of the optical projection lens is set to a range of 3.5 to 8.5 to cooperate with the remaining lens groups, the aperture 500 and the display chip 600 to improve the performance of the projection device. Reference Figure 3 , which is a schematic structural diagram of another optical projection lens provided in an embodiment of the present application. In the optical projection lens provided in an embodiment of the present application, in the direction X from the magnification side to the reduction side, the second lens group 200 sequentially includes: an eleventh lens 201 and a twelfth lens 202. It can be seen that the second lens group 200 provided in an embodiment of the present application can achieve the condition that the F2 / F0 ratio is greater than or equal to 3.5 and less than or equal to 8.5 through two lenses.

[0047] Continue to refer Figure 3 As shown, the optical axes of the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 provided in the embodiment of the present application are the same, that is, the optical axes of the eleventh lens 201 and the twelfth lens 202 are the same. Specifically, along the direction X from the magnification side to the reduction side, the front lens surface of the eleventh lens 201 is convex, and the rear lens surface of the eleventh lens 201 is flat or concave; the front lens surface of the twelfth lens 202 is flat or convex, and the rear lens surface of the twelfth lens 202 is concave.

[0048] It should be noted that the embodiments of this application provide Figure 3 The number of lenses and lens surface shape included in the second lens group 200 shown is only one of all the structures of the second lens group 200 applicable to this application. In other embodiments of the present application, the number of lenses and lens surface shapes included in the second lens group 200 can also be other situations, and this application does not impose specific limitations on this.

[0049] In some embodiments, the focal length of the third lens group provided in the embodiments of the present application is F3, and the focal length of the optical projection lens is F0, wherein the ratio F3 / F0 of the focal length F3 of the third lens group to the focal length F0 of the optical projection lens satisfies the following conditions: greater than or equal to -6 and less than or equal to -1.5. It can be understood that the optical focal length of the third lens group 300 is negative. In the embodiments of the present application, the ratio F3 / F0 of the focal length F3 of the third lens group 300 to the focal length F0 of the optical projection lens is set to a range of -6 to -1.5 to cooperate with the remaining lens groups, the aperture 500 and the display chip 600 to improve the performance of the projection device. Reference Figure 4 2 is a schematic structural diagram of another optical projection lens provided in an embodiment of the present application. In the optical projection lens provided in an embodiment of the present application, in the direction X from the magnification side to the reduction side, the third lens group 300 includes, in sequence: a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, and an eighteenth lens 306. It can be seen that the third lens group 300 provided in an embodiment of the present application can achieve the condition that the F3 / F0 ratio is greater than or equal to -6 and less than or equal to -1.5 through six lenses.

[0050] Continue to refer Figure 4 As shown, the optical axes of the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 provided in the embodiment of the present application are the same, that is, the optical axes of the thirteenth lens 301, the fourteenth lens 302, the fifteenth lens 303, the sixteenth lens 304, the seventeenth lens 305, and the eighteenth lens 306 are the same. In particular, along the direction X from the magnification side to the reduction side, the front lens surface of the thirteenth lens 301 is a plane or a concave surface, and the rear lens surface of the thirteenth lens 301 is a convex surface; the front lens surface of the fourteenth lens 302 is a plane or a concave surface, and the rear lens surface of the fourteenth lens 302 is a convex surface; the front lens surface of the fifteenth lens 303 is a concave surface, and the rear lens surface of the fifteenth lens 303 is a concave surface; the front lens surface of the sixteenth lens 304 is a convex surface, and the rear lens surface of the sixteenth lens 304 is a concave surface; the front lens surface of the seventeenth lens 305 is a convex surface, and the rear lens surface of the seventeenth lens 307 is a convex surface; the front lens surface of the eighteenth lens 306 is a convex surface, and the rear lens surface of the eighteenth lens 306 is a concave surface.

[0051] It should be noted that the embodiments of this application provide Figure 4 The number of lenses and lens surface shape included in the third lens group 300 shown in the figure is only one of all the structures of the third lens group 300 applicable to this application. In other embodiments of the present application, the number of lenses and lens surface shape included in the third lens group 300 may also be other situations, and this application does not impose specific limitations on this.

[0052] In some embodiments, the focal length of the fourth lens group 400 provided in the embodiments of the present application is F4, and the focal length of the optical projection lens is F0, wherein the ratio F4 / F0 of the focal length F4 of the fourth lens group 400 to the focal length F0 of the optical projection lens satisfies the following conditions: greater than or equal to 0.8 and less than or equal to 2.5. It can be understood that the optical focal length of the fourth lens group 400 is positive. In the embodiments of the present application, the ratio F4 / F0 of the focal length F4 of the fourth lens group 400 to the focal length F0 of the optical projection lens is set to a range of 0.8 to 2.5 to cooperate with the remaining lens groups, the aperture 500 and the display chip 600 to improve the performance of the projection device. Reference Figure 5 , which is a structural diagram of another optical projection lens provided by an embodiment of the present application, wherein, in the optical projection lens provided by an embodiment of the present application, the fourth lens group 400 includes a nineteenth lens 401.

[0053] The optical axes of the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 provided in this embodiment of the application are the same, that is, the optical axes of the nineteenth lens 401 are the same as those of the first lens group 100, the second lens group 200, and the third lens group 300. In the direction X from the magnification side to the reduction side, the front lens surface of the nineteenth lens 401 is a flat or convex surface, and the rear lens surface of the nineteenth lens 401 is a convex surface.

[0054] It should be noted that the embodiments of this application provide Figure 5 The number of lenses and lens surface shape included in the fourth lens group 400 shown is only one of all the structures of the fourth lens group 400 applicable to this application. In other embodiments of the present application, the number of lenses and lens surface shapes included in the fourth lens group 400 may also be other situations, and this application does not impose specific limitations on this.

[0055] The optical projection lens provided in the embodiment of the present application may include: Figure 2 The first lens group 100 shown, Figure 3 The second lens group 200 shown, Figure 4 The third lens group 300 and Figure 5 Specifically, in one embodiment, the optical projection lens provided by the embodiment of the present application may include: Figure 2 The first lens group 100 and Figure 3The second lens group 200 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 201, and a twelfth lens 202, all of which have the same optical axis.

[0056] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 and Figure 4 The third lens group 300 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, and an eighteenth lens 306, all of which have the same optical axis.

[0057] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, and a nineteenth lens 401 with the same optical axis.

[0058] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 3 The second lens group 200 and Figure 4 The third lens group 300 shown, i.e., the optical projection lens, includes the eleventh lens 201, the twelfth lens 202, the thirteenth lens 301, the fourteenth lens 302, the fifteenth lens 303, the sixteenth lens 304, the seventeenth lens 305 and the eighteenth lens 306 with the same optical axis.

[0059] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 3 The second lens group 200 and Figure 5 The fourth lens group 400 , ie, the optical projection lens, includes an eleventh lens 201 , a twelfth lens 202 , and a nineteenth lens 401 , which have the same optical axis.

[0060] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 4The third lens group 300 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, an eighteenth lens 306, and a nineteenth lens 401 having the same optical axis.

[0061] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 shown, Figure 3 The second lens group 200 and Figure 4 The third lens group 300 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 201, a twelfth lens 202, a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, and an eighteenth lens 306, all of which have the same optical axis.

[0062] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 shown, Figure 3 The second lens group 200 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 201, a twelfth lens 202, and a nineteenth lens 401, all of which have the same optical axis.

[0063] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 shown, Figure 4 The third lens group 300 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, an eighteenth lens 306, and a nineteenth lens 401, all of which have the same optical axis.

[0064] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 3 The second lens group 200 shown, Figure 4 The third lens group 300 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes the eleventh lens 201, the twelfth lens 202, the thirteenth lens 301, the fourteenth lens 302, the fifteenth lens 303, the sixteenth lens 304, the seventeenth lens 305, the eighteenth lens 306 and the nineteenth lens 401 with the same optical axis.

[0065] Alternatively, in one embodiment, the optical projection lens provided by the embodiment of the present application may include Figure 2 The first lens group 100 shown, Figure 3 The second lens group 200 shown, Figure 4 The third lens group 300 and Figure 5 The fourth lens group 400 shown, i.e., the optical projection lens, includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, an eighth lens 108, a ninth lens 109, a tenth lens 110, an eleventh lens 201, a twelfth lens 202, a thirteenth lens 301, a fourteenth lens 302, a fifteenth lens 303, a sixteenth lens 304, a seventeenth lens 305, an eighteenth lens 306, and a nineteenth lens 401, all of which have the same optical axis. Figure 6 The structural schematic diagram of the optical projection lens is shown.

[0066] based on Figure 6 The optical projection lens shown in the figure is combined with the data table of an optical projection lens shown in Table 1 below to simulate and analyze the optical projection lens provided in the embodiments of the present application. Lenses 101 through 401 of the optical projection lens are made of glass, and all distances in Table 1 are in millimeters. In Table 1, excluding the aperture stop, the object plane, 1, 2, ..., 37, and image plane represent the order of the front and rear lens surfaces of lenses 101 through 401 along the direction X from the magnification side to the reduction side.

[0067]

[0068]

[0069] Table 1

[0070] Combine Figures 7 to 11As shown in the simulation curve graph of various parameters of the optical projection lens, the optical projection lens provided by the embodiment of the present application has high resolution, and its global resolution MTF can be greater than 0.4. In addition, the optical projection lens provided by the embodiment of the present application can be used in a wide temperature range without the problem of out-of-focus, and the temperature range can reach greater than or equal to -20°C and less than or equal to 100°C, so that the optical projection lens can be used under extreme conditions, which improves the applicability of the projection equipment. In addition, the optical projection lens provided by the embodiment of the present application has the advantage of small chromatic aberration, and the chromatic aberration of the three primary colors of RGB is less than 0.4Pixel, and the picture and text of the projection equipment have no color edge problem. In addition, the optical projection lens provided by the embodiment of the present application also has the advantage of small global distortion, and its global distortion is less than 0.2%, which improves the performance of the projection equipment.

[0071] Based on the same inventive concept, an embodiment of the present application further provides a projection device, which includes the optical projection lens provided by any one of the above embodiments.

[0072] The present invention provides an optical projection lens and a projection device. The optical projection lens comprises, from the magnification side to the reduction side, a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and a display chip. The first lens group has a negative focal power, the second lens group has a positive focal power, the third lens group has a negative focal power, and the fourth lens group has a positive focal power. The optical projection lens has a clear aperture that satisfies the following conditions: F#2.0-F#2.4. Furthermore, by allocating positive or negative focal powers among the first, second, third, and fourth lens groups, combining the aperture with the display chip, and limiting the clear aperture of the optical projection lens, the optical projection lens provided in the present invention has advantages such as high resolution, wide temperature range, low chromatic aberration, and low global distortion, thereby improving the performance of the projection device.

[0073] In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0074] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise clearly specified.

[0075] In the embodiments of this application, unless otherwise specified or limited, terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication between them; direct connections, indirect connections through an intermediate medium, and internal connections between two components or interactions between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0076] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0077] In the embodiments of the present application, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0078] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An optical projection lens, characterized in that: The optical projection lens comprises, from the magnification side to the reduction side, a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group and a display chip; The first lens group has a negative optical power, the second lens group has a positive optical power, the third lens group has a negative optical power, and the fourth lens group has a positive optical power; The optical aperture of the projection lens satisfies the following conditions: F#2.0-F#2.

4.

2. The optical projection lens according to claim 1, wherein: The focal length of the first lens group is F1, and the focal length of the optical projection lens is F0. The ratio F1 / F0 of the focal length F1 of the first lens group to the focal length F0 of the optical projection lens satisfies the following condition: Greater than or equal to -20 and less than or equal to -10.

3. The optical projection lens according to claim 2, wherein: From the magnification side to the reduction side, the first lens group includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens.

4. The optical projection lens according to claim 1, wherein: The focal length of the second lens group is F2, and the focal length of the optical projection lens is F0, wherein the ratio F2 / F0 of the focal length F2 of the second lens group to the focal length F0 of the optical projection lens satisfies the following condition: Greater than or equal to 3.5 and less than or equal to 8.

5.

5. The optical projection lens according to claim 4, wherein: The second lens group includes, from the magnification side to the reduction side, an eleventh lens and a twelfth lens.

6. The optical projection lens according to claim 1, wherein: The focal length of the third lens group is F3, and the focal length of the optical projection lens is F0. The ratio F3 / F0 of the focal length F3 of the third lens group to the focal length F0 of the optical projection lens satisfies the following condition: Greater than or equal to -6 and less than or equal to -1.

5.

7. The optical projection lens according to claim 6, wherein: The third lens group includes, from the magnification side to the reduction side, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens.

8. The optical projection lens according to claim 1, wherein: The focal length of the fourth lens group is F4, and the focal length of the optical projection lens is F0. The ratio F4 / F0 of the focal length F4 of the fourth lens group to the focal length F0 of the optical projection lens satisfies the following condition: Greater than or equal to 0.8 and less than or equal to 2.

5.

9. The optical projection lens according to claim 8, wherein: The fourth lens group includes a nineteenth lens.

10. A projection device, characterized in that: The projection device comprises the optical projection lens according to any one of claims 1 to 9.

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