Optical lens component and projection system

Abstract

The utility model relates to the technical field of projection optics, in particular to an optical lens component and a projection system, the optical lens component comprises a light-transmitting shell I and a light-transmitting shell II, and a light-transmitting glue pouring core layer is poured between the shell I and the shell II. According to the optical lens component and the projection system, a combined lens structure is adopted, the optical performance requirement can be met, meanwhile, the thickness is small, the side-to-thickness ratio is small, the structure is compact, the occupied size is small, a traditional Fresnel lens can be replaced, the smear problem is solved, and the projection picture quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of projection optics, in particular to an optical lens component and a projection system. Background Art

[0002] Commonly used projection systems include DLP projection systems, LCD projection systems, and LCOS projection systems, among which LCD projection systems include single-chip LCD projection systems and three-chip LCD projection systems. Single-chip LCD projection systems have low costs, but their projection brightness is low and their volume is large, which restricts their development and application. In order to reduce the occupied volume, Fresnel lenses are usually set on the light-incoming side and the light-outgoing side of the LCD panel. The Fresnel lens on the light-incoming side is used to collimate the illumination light and irradiate it on the LCD panel, and the Fresnel lens on the light-outgoing side is used to converge the light modulated by the LCD panel and emit it from the lens. The volume of the Fresnel lens is small, which can reduce the volume of the single-chip LCD projection system. However, the Fresnel lens is provided with an annular tooth structure, which easily causes the projection image to have a smear during imaging, affecting the projection picture effect. Utility Model Content

[0003] The technical problem to be solved and the technical task proposed by the utility model are to improve the existing technology and provide an optical lens component and a projection system to solve the problem that the LCD projection system in the current technology uses Fresnel lens for collimation or convergence, which is prone to smear and affects the projection picture effect.

[0004] In order to solve the above technical problems, the technical solution of the utility model is:

[0005] An optical lens component includes a shell part 1 and a shell part 2, wherein the shell part 1 and the shell part 2 are light-transmitting components, and at least one of the shell part 1 and the shell part 2 is in a curved surface shape. The shell part 1 and the shell part 2 are combined to form a cavity between the two, and a light-transmitting glue core layer is poured into the cavity. The optical lens component described in the utility model adopts a combined structure, which can form a lens component that meets the requirements of optical imaging. Compared with traditional lenses, it has a thin thickness, a small edge-to-thickness ratio, a compact structure, a small occupied volume, and a relatively low processing difficulty. It can replace traditional Fresnel lenses, solve the problem of ghosting, and improve the quality of projection images.

[0006] Furthermore, at least one of the shell component 1 and the shell component 2 is spherical or aspherical, that is, the optical lens component as a whole is an aspherical lens, which can effectively correct aberrations and distortions and improve projection display effects.

[0007] Furthermore, the surface shape of the shell component 1 and / or the shell component 2 is M-shaped, and aberration and distortion can be corrected in a targeted manner by setting a specific aspherical surface shape.

[0008] Furthermore, the material of the shell component 1 and the shell component 2 is the same as or different from the material of the glue-filled core layer, and as a whole can play the function of a traditional glued lens group, and can effectively correct chromatic aberration, perform thermal compensation on the optical system, etc.

[0009] Furthermore, the refractive index of the shell component 1 and the shell component 2 is the same as or different from the refractive index of the glue-filled core layer, which effectively corrects chromatic aberration and performs thermal compensation on the optical system.

[0010] Furthermore, the refractive power of the optical lens component is positive, which can collimate and converge light, thus meeting application requirements.

[0011] Furthermore, the shell part 1 and the shell part 2 are sheets with uniform wall thickness, simple and compact structure, small space occupation and low processing difficulty.

[0012] A projection system comprises an LCD panel and the above optical lens component, wherein the optical lens component is respectively arranged on the light incident side and / or the light exit side of the LCD panel. The utility model uses the optical lens component to replace the traditional Fresnel lens, solves the problem of smearing, and improves the quality of the projected image. The optical lens component has a compact structure and occupies a small volume, and will not excessively increase the overall volume of the projection system.

[0013] Furthermore, the aperture size of the optical lens component is consistent with the size of the LCD panel, which can fully and effectively collimate the illumination light and evenly illuminate the entire LCD panel. It can also effectively collect and converge the image light modulated by the LCD panel and then emit it to the lens for projection, thereby ensuring the quality of the projection picture.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The optical lens component and projection system described in the utility model adopt a combined lens structure, which can meet the optical performance requirements, and at the same time has a thin thickness, a small edge-to-thickness ratio, a compact structure, and a small occupied volume. It can replace the traditional Fresnel lens, solve the problem of ghosting, and improve the quality of the projection picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an optical lens component of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a projection system of the utility model;

[0018] Figure 3 It is a structural schematic diagram of another projection system of the present utility model.

[0019] In the figure:

[0020] Shell component 1, shell component 2, glue-filled core layer 3, optical lens component 10, LCD panel 20, Fresnel lens element 11. DETAILED DESCRIPTION

[0021] The following will be combined with 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 only 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.

[0022] An optical lens component disclosed in an embodiment of the utility model has a simple and compact structure, occupies a small space, can replace a Fresnel lens, does not cause a smearing condition, and can better improve the quality of a projection picture.

[0023] like Figure 1 As shown, an optical lens component mainly includes a shell part 1 and a shell part 2, wherein the shell part 1 and the shell part 2 are light-transmitting components, and the shell part 1 and the shell part 2 are specifically made of optically transparent materials that meet the optical performance requirements, and can specifically be glass, resin, etc., and at least one of the shell part 1 and the shell part 2 is in a curved shape, and the shell part 1 and the shell part 2 are combined to form a cavity therebetween, and a light-transmitting glue-potting core layer 3 is poured in the cavity. In short, the shell part 1 and the shell part 2 are combined with the glue-potting core layer 3 poured therebetween to form a lens of a combined structure, and when light passes through the optical lens component, the optical lens component refracts and guides the light so that the propagation state of the light meets the optical requirements. The optical lens component specifically used in this embodiment uses shell 1 and shell 2 to respectively form the light-entering side surface and light-emitting side surface of the traditional lens. Shell 1 and shell 2 are easy to manufacture and process according to requirements, and can more conveniently process shell 1 and shell 2 into the required surface structure. The difficulty of manufacturing is relatively low, and at the same time, it is ensured that the optical lens component can meet the optical requirements after assembly. Shell 1 and shell 2 are more convenient to manufacture, and can reduce the overall volume size of the optical lens component while meeting the optical requirements. Compared with traditional lenses, the overall thickness of the optical lens component is thinner and the edge-to-thickness ratio is smaller, so when applied to a projection system, the volume of the projection system will not be increased too much, meeting the needs of miniaturization development.

[0024] The shell component 1 and the shell component 2 2 are specifically in the form of a thin sheet layer structure, which can be easily processed into various surface structures. For example, the thin sheet layer can be processed into the desired surface structure by injection molding, vacuum forming, pressing, etc. to obtain the shell component 1 and the shell component 2 2. Preferably, the shell component 1 and the shell component 2 2 are sheets with uniform wall thickness, simple structure, easy processing and manufacturing, and low implementation cost. Shell 1 and shell 2 are equivalent to the light-entering side surface and light-exiting side surface of a traditional lens. After the surface structure of shell 1 and shell 2 is determined, the overall optical performance of the optical lens component is basically determined, that is, the overall refractive power of the optical lens component, the convergence, collimation or divergence effect of the light are basically determined. The refractive power of the optical lens component can be positive or negative. When the refractive power of the optical lens component is positive, the optical lens component plays a role of convergence or collimation, and when the refractive power of the optical lens component is negative, it plays a role of divergence of the light. Then, by specifically setting the materials of shell 1 and shell 2 and the material of the glue-filled core layer 3, the optical lens component can be made to meet the needs more flexibly and accurately. Specifically, shell 1 and shell 2 can be spherical or aspherical. When at least one of shell 1 and shell 2 is aspherical, the optical lens component is an aspherical lens as a whole, which can effectively correct aberrations and distortions and improve the projection display effect. In a preferred embodiment, the aspheric shape can specifically be an M-shaped surface structure, that is, the cross-section of shell 1 or shell 2 is an M-shaped structure, so that the overall thickness of the optical lens component is thin in the center, first thickens and then thins toward the radial outside, or the overall thickness of the optical lens component is thick in the center, first thins and then thickens toward the radial outside. Different surface shape combinations of shell 1 and shell 2 can form lenses with various performances.

[0025] Furthermore, the optical lens component has a three-layer structure. When shell component 1 and shell component 2 are combined together, the outer edge of shell component 1 is in contact with the outer edge of shell component 2 or a distance is maintained between them, and a cavity is formed between shell component 1 and shell component 2. Resin glue that meets the optical performance requirements is injected into the cavity by glue injection molding. After the resin glue is cured and formed into a glue core layer 3, shell component 1 and shell component 2 are connected into an integral component through the glue core layer 3. The structure is simple, compact, and easy to process and manufacture. The optical lens component as a whole can play the function of a traditional three-cement lens group, and can usually correct chromatic aberration and perform thermal compensation on the optical system. Specifically, the material of the shell component 1 and the shell component 2 2 is the same as or different from the material of the glue-potted core layer 3. Furthermore, the refractive index of the shell component 1 and the shell component 2 2 is the same as or different from the refractive index of the glue-potted core layer 3. Similarly, the refractive index of the shell component 1 and the shell component 2 2 may be the same as or different from the Abbe number of the glue-potted core layer 3. By specifically setting the materials of the shell component 1 and the shell component 2 2 and the glue-potted core layer 3, the optical lens component can achieve different performances and flexibly meet different optical needs.

[0026] like Figure 2 As shown, a projection system mainly includes an LCD panel 20 and the aforementioned optical lens component 10. The optical lens component 10 is respectively arranged on the light incident side and / or the light exit side of the LCD panel 20. In this embodiment, the optical lens component 10 is used to replace the traditional Fresnel lens. While ensuring a compact structure and a small space occupation, the problem of ghosting is solved and the quality of the projection picture is improved. The optical lens component 10 is also easy to process to form an aspherical lens, which can better correct aberrations and distortions, improve the quality of the projection picture, and ensure MTF>38%.

[0027] The projection system further includes a light source and a lens. The light source is arranged on the light incident side of the LCD panel 20. The optical lens component 10 on the light incident side of the LCD panel 20 is located between the light source and the LCD panel 20. The lens is arranged on the light exit side of the LCD panel. The optical lens component 10 on the light exit side of the LCD panel 20 is located between the LCD panel 20 and the lens. Generally, the light emitted from the light source to the LCD panel 20 has a certain degree of divergence angle. The optical lens component 10 on the light incident side of the LCD panel 20 is used to collimate the light. The refractive power of the optical lens component 10 on the light incident side of the LCD panel 20 is positive, so that the illumination light is more fully and evenly irradiated on the LCD panel 20, which is conducive to improving the brightness and quality of the projection picture. The optical lens component 10 on the light exit side of the LCD panel 20 is mainly used to fully collect and converge the image light modulated by the LCD panel 20 and then emit it to the lens. Then, the lens is used to project the image light onto the screen surface to form a projection picture. The refractive power of the optical lens component 10 on the light exit side of the LCD panel 20 is also positive. Furthermore, the aperture size of the optical lens component 10 is consistent with the size of the LCD panel 20. In other words, the surface size of the optical lens component 10 is comparable to that of the LCD panel 20, so that the optical lens component 10 fully covers the entire LCD panel 20, so that the illumination light can fully and evenly illuminate the entire LCD panel 20 after collimation, and the image light generated by the modulation of the entire LCD panel 20 can be fully collected to converge and emit to the lens, which is beneficial to improving the projection brightness and the projection picture quality.

[0028] In a specific implementation, both the shell 1 and the shell 2 are aspherical, and the aspherical polynomial formula is:

[0029]

[0030] In the formula, z represents the distance vector height of the aspheric surface from the fixed point of the aspheric surface when the aspheric surface is at a height r along the optical axis, the parameter c is the curvature corresponding to the radius, r is the radial height of the lens, k is the conic quadratic curve coefficient ConicConstant, α1~α8 are the aspheric coefficients corresponding to the 2nd to 16th orders, as shown in Table 1, where S1 represents shell 1, and S2 represents shell 2.

[0031] When the k coefficient is less than -1, the surface curve of the lens is a hyperbola;

[0032] When the k coefficient is equal to -1, the surface curve of the lens is a parabola;

[0033] When the k coefficient is between -1 and 0, the surface curve of the lens is an ellipse;

[0034] When the k coefficient is equal to 0, the surface curve of the lens is circular;

[0035] When the k coefficient is greater than 0, the surface curve of the lens is an oblate circle.

[0036] Table 1

[0037] R K <![CDATA[α 2 ]]> <![CDATA[α 3 ]]> <![CDATA[α 4 ]]> <![CDATA[α 5 ]]> <![CDATA[α 6 ]]> <![CDATA[α 7 ]]> <![CDATA[α 8 ]]> S1 40.651 -1.000 -7.18E-06 4.00E-09 -5.46E-12 6.49E-15 -4.00E-18 1.13E-21 -1.11E-25 S2 162.862 0.000 -1.04E-06 -2.96E-09 1.98E-12 2.79E-16 -6.88E-19 1.75E-22 0.00E+00

[0038] In addition, one side surface of the conventional Fresnel lens is a toothed surface having a toothed ring structure equivalent to an aspherical surface, and the other side surface is a plane. The plane of the conventional Fresnel lens is optimized and improved into an aspherical surface to form Figure 3 The Fresnel lens element 11 shown in the figure can obtain better design performance, MTF>35%, can achieve better resolution or serve as a cost reduction margin for lens optical components. Specifically, the surface shape of the aspherical surface of the Fresnel lens element 11 can be an M-type structure, that is, the overall thickness of the Fresnel lens element 11 is thin in the center, first thickens and then thins radially outward. When the Fresnel lens element 11 is arranged on the light-emitting side of the LCD panel 20, the surface of the side of the Fresnel lens element 11 close to the LCD panel 20 is a tooth surface, and the surface of the side of the Fresnel lens element 11 close to the lens is an aspherical surface, which can preferably be set to an M-type aspherical structure. The surface shape data of the two side surfaces of the Fresnel lens element 11 are shown in Table 2, where S1 represents the tooth surface and S2 represents the aspherical surface on the other side. In another alternative, the surface shape data of the two side surfaces of the Fresnel lens element 11 are shown in Table 3, where S1 represents the tooth surface and S2 represents the aspherical surface on the other side.

[0039] Table 2

[0040] R K <![CDATA[α 2 ]]> <![CDATA[α 3 ]]> <![CDATA[α 4 ]]> S1 -41.9289 -2.447825E+00 0.00E+00 0.00E+00 0.00E+00 S2 -220.334 1.305210E-06 -3.96542E-10 9.89952E-14 -1.27321E-17

[0041] Table 3

[0042] R K <![CDATA[α 2 ]]> <![CDATA[α 3 ]]> <![CDATA[α 4 ]]> <![CDATA[α 5 ]]> <![CDATA[α 6 ]]> <![CDATA[α 7 ]]> <![CDATA[α 8 ]]> <![CDATA[α 9 ]]> <![CDATA[α 10 ]]> S1 201.695 0 7.937E-07 -6.092E-10 8.450E-13 -8.947E-16 5.822E-19 -2.273E-22 5.233E-26 -6.548E-30 3.435E-34 S2 -44.086 0 3.804E-06 1.007E-09 -1.425E-11 3.300E-14 -4.434E-17 3.118E-20 -9.437E-24 2.347E-27 -1.045E-30

[0043] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An optical lens component, characterized in that: The invention comprises a shell part 1 (1) and a shell part 2 (2), wherein the shell part 1 (1) and the shell part 2 (2) are light-transmitting parts, and at least one of the shell part 1 (1) and the shell part 2 (2) is in a curved shape. The shell part 1 (1) and the shell part 2 (2) are combined to form a cavity therebetween, and a light-transmitting glue-filled core layer (3) is poured into the cavity.

2. The optical lens component according to claim 1, characterized in that At least one of the shell part 1 (1) and the shell part 2 (2) is spherical or aspherical.

3. The optical lens component according to claim 1, characterized in that The surface shape of the shell part 1 (1) and / or the shell part 2 (2) is M-shaped.

4. The optical lens component according to claim 1, characterized in that The material of the shell part 1 (1) and the shell part 2 (2) is the same as or different from the material of the glue-filled core layer (3).

5. The optical lens component according to claim 1, characterized in that The refractive index of the shell component 1 (1) and the shell component 2 (2) is the same as or different from the refractive index of the glue-filled core layer (3).

6. The optical lens component according to claim 1, characterized in that The refractive power of the optical lens element is positive.

7. The optical lens component according to claim 1, characterized in that The shell part one (1) and the shell part two (2) are sheets with uniform wall thickness.

8. A projection system, characterized in that: It comprises an LCD panel (20) and the optical lens component according to any one of claims 1 to 7, wherein the optical lens component is respectively arranged on the light incident side and / or the light emitting side of the LCD panel (20).

9. The projection system according to claim 8, characterized in that: The aperture size of the optical lens component is consistent with the size of the LCD panel (20).

Images