Vehicle-mounted high-uniformity zoom projection lens
By designing a vehicle-mounted high-uniformity zoom projection lens and employing a specific lens combination and lens design, the problem that fixed-focus lenses cannot meet the needs of different application scenarios has been solved, achieving high brightness, low distortion, and low-cost projection effects.
Patent Information
- Application Number
- CN202520071724.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Most existing projectors use fixed-focus lenses, which cannot meet the needs of different application scenarios.
A vehicle-mounted high-uniformity zoom projection lens was designed, comprising a first group of lenses, a second group of lenses, an aperture, a galvanometer, a beam splitter, and an image plane arranged in sequence. Aberrations are corrected through a specific lens combination, and a nine-lens design is adopted to reduce cost and assembly difficulty.
It achieves applicability with a projection ratio of 1.2 to 1.5, low FNO. value, high brightness, relative illuminance above 90% across the entire field of view, distortion within 0.5%, TV distortion within 0.3%, low lens cost, and reduced assembly difficulty.
Smart Images
Figure CN223742842U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to projection lens technical field especially is related to a vehicle high uniformity zoom projection lens. BACKGROUND
[0002] The projection lens is the core component of the projection equipment, and the light is projected to the projection screen after the light modulation device of reflection or projection.
[0003] With the development of science and technology, the projection equipment is applied in more and more fields, including home audio and video, projection advertisement, industrial detection, 3D printing etc. The demand of vehicle installation projection is more and more, but most of the projectors are fixed focus lens at present, cannot satisfy different application scenes simultaneously. UTILITY MODEL CONTENT
[0004] In order to overcome the insufficient of prior art, the utility model provides a vehicle high uniformity zoom projection lens, and solves the problem that most of the projectors are fixed focus lens in prior art, cannot satisfy different application scenes simultaneously.
[0005] In order to achieve the above object, the utility model provides the following scheme:
[0006] A vehicle high uniformity zoom projection lens, comprising:
[0007] The first group lens, the second group lens, the diaphragm, the galvanometer, the light splitting device, the protection glass and the image surface are arranged in sequence.
[0008] The image surface is used for emitting light, the protection glass is used for preventing dust from falling into the image surface and the light splitting device, the galvanometer is used for adjusting the pixel of imaging, the light splitting device is used for splitting the light, the diaphragm is used for controlling the light quantity of split light, and the first group lens and the second group lens are used for correcting aberration.
[0009] The first group lens comprises a first lens, a second lens, a third lens and a fourth lens, the first lens is a convex-concave lens with negative focal power, the second lens is a double-concave lens with negative focal power, the third lens is a double-convex lens with positive focal power, and the fourth lens is a convex-concave lens with negative focal power.
[0010] The second group lens comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens.
[0011] The fifth lens is a biconvex lens with positive focal power, the sixth lens and the seventh lens are cemented lenses with negative focal power, the eighth lens is a biconvex aspheric lens with positive focal power, and the ninth lens is a biconvex aspheric lens with positive focal power.
[0012] The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all arranged in front of the diaphragm, and the sixth lens, the seventh lens, the eighth lens and the ninth lens are all arranged behind the diaphragm.
[0013] Preferably, the first lens and the ninth lens are both aspheric lenses.
[0014] Preferably, the second lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all spherical lenses.
[0015] Preferably, the ratio of the focal length of the first lens to the focal length of the first group of lenses is 1.24, the ratio of the focal length of the second lens and the third lens to the focal length of the first group of lenses is -3.79, the ratio of the focal length of the fourth lens to the focal length of the first group of lenses is -33.65, the ratio of the focal length of the fifth lens to the focal length of the second group of lenses is 1.38, the ratio of the focal length of the sixth lens and the seventh lens to the focal length of the second group of lenses is -2.38, the ratio of the focal length of the eighth lens to the focal length of the second group of lenses is 1.65, and the ratio of the focal length of the ninth lens to the focal length of the second group of lenses is 1.51.
[0016] Preferably, the MTF value of each field of view of the zoom projection lens is greater than 0.5.
[0017] Preferably, the lens of the zoom projection lens adopts a 0.23-inch DMD.
[0018] Preferably, the projection ratio range of the zoom projection lens is 1.2-1.5.
[0019] Preferably, the effective focal length range of the zoom lens is 6.37mm-7.74mm, and the F / NO. is F1.7.
[0020] The utility model discloses the following technical effects:
[0021] The utility model provides a kind of vehicle-mounted high uniformity zoom projection lens, comprising: first group lens, second group lens, diaphragm, galvanometer, light splitting device, protection glass and image plane are sequentially arranged;The image plane is used to emit light, the protection glass is used to prevent dust from falling into the image plane and light splitting device, the galvanometer is used to adjust the pixel of imaging, the light splitting device is used to split the light, the diaphragm is used to control the light quantity of split light, the first group lens and the second group lens are used to correct aberration;The first group lens includes: first lens, second lens, third lens and fourth lens, the first lens is convex-concave lens with negative optical power, the second lens is double-concave lens with negative optical power, the third lens is double-convex lens with positive optical power, the fourth lens is convex-concave lens with negative optical power;The second group lens includes: fifth lens, sixth lens, seventh lens, eighth lens and ninth lens;The fifth lens is double-convex lens with positive optical power, the sixth lens and the seventh lens are cemented lens with negative optical power, the eighth lens is double-convex aspheric lens with positive optical power, the ninth lens is double-convex aspheric lens with positive optical power;The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all placed in front of the diaphragm, and the sixth lens, the seventh lens, the eighth lens and the ninth lens are all placed behind the diaphragm.The DLP projection lens disclosed by the utility model has a projection ratio of 1.2-1.5, and is suitable for projection requirements at different distances.The disclosed DLP projection lens has a small FNO value, high efficiency and high brightness, and can meet the requirements of normal daytime use.The relative luminance of the disclosed DLP projection lens is higher than 90% in the full field of view, the distortion is within 0.5%, the TV distortion is within 0.3%, and the distortion correction is very excellent.The lenses of the disclosed DLP projection lens are all glass spherical lenses, only nine lenses are used, and the materials used are low-cost optical lens materials, which greatly reduces the lens cost and assembly difficulty. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor intensity.
[0023] Figure 1 A vehicle-mounted high uniformity zoom projection lens structure schematic view provided by the utility model embodiment;
[0024] Figure 2 A zoom lens group displacement schematic view provided by the utility model embodiment.
[0025] Figure 3 The MTF schematic diagram of the zoom system in a short-focus state is provided for the embodiment of the utility model;
[0026] Figure 4 The MTF schematic diagram of the zoom system in a long-focus state is provided for the embodiment of the utility model;
[0027] Figure 5 The relative-illuminance schematic diagram of the zoom system in a short-focus state is provided for the embodiment of the utility model;
[0028] Figure 6 The relative-illuminance schematic diagram of the zoom system in a long-focus state is provided for the embodiment of the utility model;
[0029] Figure 7 The field curvature distortion schematic diagram of the zoom system in a short-focus state is provided for the embodiment of the utility model, Figure 7 (a) is a field curvature evaluation diagram, Figure 7 (b) is a distortion evaluation diagram.
[0030] Explanation of reference signs:
[0031] 1-First group lens, 2-Second group lens, 3-Stop, 4-Mirror, 5-Splitting device, 6-Protective glass, 7-Image plane, GM01-First lens, G02-Second lens, G03-Third lens, G04-Fourth lens, G05-Fifth lens, G06-Sixth lens, G07-Seventh lens, G08-Eighth lens, GM09-Ninth lens. DETAILED DESCRIPTION
[0032] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0033] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.
[0034] As Figure 1 shown, the utility model provides a kind of vehicle-mounted high uniformity zoom projection lens, comprising:
[0035] First group lens 1, second group lens 2, stop 3, mirror 4, splitting device 5, protective glass 6 and image plane 7 are sequentially arranged;
[0036] The image plane 7 is used to emit light, the protective glass 6 is used to prevent dust from falling on the image plane 7 and the light splitting device 5, the galvanometer 4 is used to adjust the imaging pixels, the light splitting device 5 is used to split the light, the diaphragm 3 is used to control the light amount of the split light, and the first group of lenses and the second group of lenses are used to correct aberration.
[0037] The first group of lenses includes a first lens GM01, a second lens G02, a third lens G03 and a fourth lens G04, the first lens GM01 is a convex-concave lens with negative focal power, the second lens G02 is a double-concave lens with negative focal power, the third lens G03 is a double-convex lens with positive focal power, and the fourth lens G04 is a convex-concave lens with negative focal power.
[0038] The second group of lenses includes a fifth lens G05, a sixth lens G06, a seventh lens G07, an eighth lens G08 and a ninth lens GM09.
[0039] The fifth lens G05 is a double-convex lens with positive focal power, the sixth lens G06 and the seventh lens G07 are cemented lenses with negative focal power, the eighth lens G08 is a double-convex aspheric lens with positive focal power, and the ninth lens GM09 is a double-convex aspheric lens with positive focal power.
[0040] The first lens GM01, the second lens G02, the third lens G03, the fourth lens G04 and the fifth lens G05 are all placed in front of the diaphragm 3, and the sixth lens G06, the seventh lens G07, the eighth lens G08 and the ninth lens GM09 are all placed behind the diaphragm 3.
[0041] Further, the first lens GM01 and the ninth lens GM09 are both aspheric lenses.
[0042] Further, the second lens G02, the second lens G02, the third lens G03, the fourth lens G04, the fifth lens G05, the sixth lens G06, the seventh lens G07 and the eighth lens G08 are all spherical lenses.
[0043] Further, the ratio of the focal length of the first lens GM01 to the focal length of the first group lens is 1.24; the ratio of the focal length of the second lens G02 and the third lens G03 to the focal length of the first group lens is -3.79; the ratio of the focal length of the fourth lens G04 to the focal length of the first group lens is -33.65; the ratio of the focal length of the fifth lens G05 to the focal length of the second group lens is 1.38; the ratio of the focal length of the sixth lens G06 and the seventh lens G07 to the focal length of the second group lens is -2.38, and the ratio of the focal length of the eighth lens G08 to the focal length of the second group lens is 1.65; the ratio of the focal length of the ninth lens GM09 to the focal length of the second group lens is 1.51.
[0044] Specifically, the ratio of the focal length f1 of the first group lens of the objective lens system to the focal length f2 of the second group lens is about -0.79; the ratio of the focal length fG1 of the GM01 lens to the focal length f1 of the first group lens of the objective lens system is about 1.24; the ratio of the focal length fG23 of the G0203 cemented lens to the focal length f1 of the first group lens of the objective lens system is about -3.79; the ratio of the focal length fG4 of the G04 lens to the focal length f1 of the first group lens of the objective lens system is about -33.65; the ratio of the focal length fG5 of the G05 lens to the focal length f2 of the second group lens of the objective lens system is about 1.38; the ratio of the focal length fG67 of the G0607 lens to the focal length f2 of the second group lens of the objective lens system is about -2.38; the ratio of the focal length fG8 of the G08 lens to the focal length f2 of the second group lens of the objective lens system is about 1.65; and the ratio of the focal length fG9 of the GM09 lens to the focal length f2 of the second group lens of the objective lens system is about 1.51. In the objective lens system, the air gap between G04 and G05 and the air gap between GM09 and the galvanometer 44 are variable. Table 1 is a table of specific parameters of the objective lens system, and Table 1 is as follows:
[0045] Table 1 Table of specific parameters of the objective lens system
[0046]
[0047]
[0048] Table 2 is a table of coefficients of each order of the aspherical lens GM01\GM09, and Table 2 is as follows:
[0049] Table 2 Table of coefficients of each order of the aspherical lens GM01\GM09
[0050]
[0051] The variable spacing values of the variable focus lens are shown in Table 3, and Table 3 is as follows:
[0052] Table 3 Table of variable spacing values of the variable focus lens
[0053]
[0054] Further, as shown in Figures 2-4 the MTF values of each field of view of the zoom projection lens are all greater than 0.5.
[0055] Specifically, the MTF (Modulation Transfer Function) index is the most accurate and scientific evaluation standard for the lens. The ordinate is the contrast, and the closer to 1, the better the imaging of the lens. The abscissa represents the resolution, with the unit of line pairs per millimeter. The pixel size of the image source used in the embodiment of the application is 5.4 um, and the corresponding half Nyquist frequency is 93 line pairs per millimeter. The MTF values of each field of view of the embodiment of the application at the Nyquist frequency are all greater than 0.5.
[0056] As shown in Figures 5-6 the relative illumination refers to the ratio of the illumination of different coordinate points in the image plane to the illumination of the center point, and the ordinate represents the normalized illumination value, and the abscissa represents the field angle of the lens. Under the same conditions, the transition of the relative illumination curve of each field is smooth, which represents that the illumination in the projection frame is uniform, and the closer the relative illumination value of each field to 1, the higher the final projection brightness.
[0057] As shown in Figure 7 Figure 7 (a) is a field curvature evaluation graph, Figure 7 (b) is a distortion evaluation graph. The ordinate represents the field angle of the lens. The abscissa of the field curvature graph represents the field curvature value, and the abscissa of the distortion graph represents the distortion amount. Distortion is a very important index of the projection lens, and generally needs to be controlled within 3%, and TV distortion needs to be controlled within 1%; the system distortion of the embodiment of the application is within 0.5%, and the TV distortion amount is also within 0.3%, and the distortion property of the system is excellent.
[0058] Further, the lens of the zoom projection lens adopts a 0.23-inch DMD.
[0059] Specifically, the projection ratio range of the zoom lens is 1.2-1.5; the effective focal length range of the zoom lens is 6.37 mm-7.74 mm, and the F / NO. is all F1.7; the zoom lens is adapted to a 0.23-inch DMD, the offset of the zoom lens is more than 100%; the relative illumination of the lens reaches more than 90%, and the uniformity is very high.
[0060] Still further, the projection objective lens system
[0061] 1. In the embodiment, the optical lens satisfies the following conditional expression:
[0062] 1.5 < f / IH < 2.1 (1)
[0063] Where f represents the effective focal length of the optical lens, and IH represents the actual half-image height of the optical lens.
[0064] When condition (1) is met, the lens can achieve a change in the projection ratio (TR) from 1.2 to 1.5 within the zoom range.
[0065] 2. In the implementation method, the optical lens satisfies the following condition:
[0066] 0.8 <EPND / IH<1.3 (2)
[0067] Wherein, EPND represents the aperture of the optical lens, and IH represents the actual half-image height of the optical lens.
[0068] When condition (2) is met, a reasonable balance between the light transmission of the lens and the size of the imaging surface 7 can be achieved.
[0069] 3. In the implementation method, the optical lens satisfies the following condition:
[0070] 25 <TL*f / IH 2 <33 (3)
[0071] Wherein, TL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half-image height of the optical lens.
[0072] When condition (3) is satisfied, the relationship between the total length of the lens and its resolving power can be reasonably balanced. TL*f / IH 2 When the value exceeds the upper limit, the overall length of the lens is too large, or in other words, if the overall length is shortened, the image height will be insufficient; TL*f / IH 2 When the value exceeds the lower limit, the lens aberration correction becomes difficult due to the excessive optical focal length of each lens, and the resolving power decreases significantly.
[0073] 4. In the implementation method, the optical lens satisfies the following condition:
[0074] 6.1mm <IH / tanθ<7.9mm (4)
[0075] Wherein, IH represents the actual half-image height of the optical lens, and θ represents the half-field angle of the optical lens.
[0076] When condition (4) is met, the distortion of the optical lens can be reasonably limited, reducing the difficulty of distortion correction. When the value of IH / tanθ exceeds the lower limit, the distortion of the lens will increase in the negative direction; when the value of IH / tanθ exceeds the upper limit, the distortion of the lens will increase in the positive direction.
[0077] 5、In an embodiment, the optical lens satisfies the following conditional expression:
[0078] CRA<2° (5)
[0079] Wherein, CRA represents the chief ray incidence angle of the optical lens at the imaging surface 7.
[0080] When the conditional expression (5) is satisfied, the DMD can be better matched, and a good projection effect can be achieved.
[0081] The various embodiments are described in a progressive manner in the specification, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be mutually referred to.
[0082] The principle and implementation mode of the present application are described by using specific examples in the specification, and the above embodiment is only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, the specific implementation mode and application range will be changed according to the idea of the present application. In conclusion, the content of the specification should not be understood as a limitation of the present application.
Claims
1. A vehicle-mounted high-uniformity zoom projection lens, characterized in that, The application relates to a zoom projection lens. The zoom projection lens comprises a first group of lenses, a second group of lenses, a diaphragm, a vibrating mirror, a light splitting device, a protective glass and an image plane. The image plane is used for emitting light, the protective glass is used for preventing dust from falling on the image plane and the light splitting device, the vibrating mirror is used for adjusting the pixels of an image, the light splitting device is used for splitting the light, the diaphragm is used for controlling the light quantity of the split light, and the first group of lenses and the second group of lenses are used for correcting aberration. The first group of lenses comprises a first lens, a second lens, a third lens and a fourth lens. The second group of lenses comprises a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The fifth lens is a double-convex lens with positive focal length, the sixth lens and the seventh lens are cemented lenses with negative focal length, the eighth lens is a double-convex spherical lens with positive focal length, and the ninth lens is a double-convex aspherical lens with positive focal length. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in front of the diaphragm, and the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged behind the diaphragm.
2. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The first lens and the ninth lens are aspherical lenses.
3. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are spherical lenses.
4. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The ratio of the focal length of the first lens to the focal length of the first group of lenses is 1.24, the ratio of the focal length of the second lens and the third lens to the focal length of the first group of lenses is -3.79, the ratio of the focal length of the fourth lens to the focal length of the first group of lenses is -33.65, the ratio of the focal length of the fifth lens to the focal length of the second group of lenses is 1.38, the ratio of the focal length of the sixth lens and the seventh lens to the focal length of the second group of lenses is -2.38, the ratio of the focal length of the eighth lens to the focal length of the second group of lenses is 1.65, and the ratio of the focal length of the ninth lens to the focal length of the second group of lenses is 1.
51.
5. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The MTF value of each field of view of the zoom projection lens is greater than 0.
5.
6. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The lens of the zoom projection lens adopts a 0.23-inch DMD.
7. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The projection ratio range of the zoom projection lens is 1.2-1.
5.
8. The vehicle-mounted high-uniformity zoom projection lens according to claim 1, characterized in that, The effective focal length range of the zoom lens is 6.37mm-7.74mm, and the F / NO. is F1.7.