Laser pixel projection headlamp
By using an optical path design consisting of a laser and multiple lenses, the problems of poor image quality and blurred edges in LED pixel headlight projection are solved, achieving high-quality, high-efficiency imaging while reducing the size and cost of the optical system.
Patent Information
- Application Number
- CN202520081642.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-14
AI Technical Summary
In existing projection equipment, pixel lamp projection using light-emitting diodes as the light source suffers from poor image quality and blurred edges, as well as high power consumption, large size of the optical system, and low energy utilization.
The optical path design employs a laser and multiple lenses, including a G1 lens, a first lens group, and a second lens group. The laser generates blue laser light, which is excited by phosphor to produce colored light, and the images are formed by the lens group to achieve high-quality imaging.
It achieves high-quality, high-efficiency imaging, solves the problems of poor image quality and blurred edges in pixel headlight projection, and reduces the size and cost of the optical system.
Smart Images
Figure CN223740632U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lighting application field especially relates to a laser pixel projection headlamp. BACKGROUND
[0002] With the development of science and technology, projection equipment is applied in more and more fields, including lighting application fields such as stage lighting, outdoor lighting and vehicle lighting. The introduction of projection technology and equipment adds more diversified performance indicators and technical requirements to the original non-imaging optical application scene products. The core principle of the projection equipment is that light passes through a reflective or projection light modulation device and then is projected onto a projection screen through a projection lens to form an image. At present, light emitting diode light sources are mainly used in application fields such as vehicle lighting, stage lighting and outdoor lighting, which have high brightness requirements.
[0003] Since the lighting system needs to output high luminous flux, the luminous flux of the light source is required to be high, which leads to high power consumption of the light source and an increase in the light emitting area of the light source. This negative chain reaction directly leads to an increase in the size of the optical system, a decrease in energy utilization rate and an increase in manufacturing cost. After the performance and the above-mentioned defects are balanced, the performance is low. SUMMARY
[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a laser pixel projection headlamp, which solves the problems of poor image quality and blurred edges of the pixel headlamp using a light emitting diode as a light source.
[0005] To achieve the above-mentioned purpose, the utility model provides the following scheme:
[0006] A laser pixel projection headlamp comprises a laser, two G1 lenses, a G2 lens, a G3 lens, a G4 lens, a G5 lens, a G6 lens, a G7 lens, a first reflector, a second reflector, fluorescent powder, protective glass and a liquid crystal panel.
[0007] The G2 lens and the G3 lens form a first lens group; the G4 lens, the G5 lens, the G6 lens and the G7 lens form a second lens group; blue laser emitted by the laser passes through the first G1 lens, the first reflector, the second reflector, the second G1 lens, the fluorescent powder, the second G1 lens, the protective glass, the first lens group, the liquid crystal panel and the second lens group in sequence.
[0008] The laser is used for generating blue laser; the G1 lens is used for adjusting the angle of light; the first reflector and the second reflector are both used for folding the light path; the fluorescent powder is used for exciting and reflecting colored light; the first lens group is used for adjusting the pupil size of the system; and the second lens group is used for imaging projection.
[0009] Preferably, the G1 lens, the G2 lens, the G3 lens, the G4 lens, the G5 lens, the G6 lens, the G7 lens, the first reflecting mirror, the second reflecting mirror and the protective glass are all made of glass.
[0010] Preferably, the first lens group and the second lens group both have positive focal power.
[0011] Preferably, the G1 lens, the G2 lens, the G3 lens, the G4 lens, the G5 lens, the G6 lens and the G7 lens are all spherical lenses.
[0012] Preferably, the front intercept of the G1 lens is less than 1mm; and the ratio of the outer diameter to the focal length of the G1 lens ranges from 1.5 to 2.0.
[0013] Preferably, the ratio of the outer diameter to the focal length of the G3 lens ranges from 1.5 to 2.0.
[0014] Preferably, the ratio of the effective focal length of the second lens group to the first lens group ranges from 80 to 90.
[0015] Preferably, the ratio of the distance from the G4 lens to the G7 lens to the distance from the G4 lens to the liquid crystal panel ranges from 11 to 13.
[0016] Preferably, the ratio of the total length of the light path from the laser to the fluorescent powder to the effective focal length of the first lens group is less than 2.
[0017] The utility model discloses the following technical effects:
[0018] The utility model provides a kind of laser pixel projection headlamp, through G1 lens, first lens group, second lens group, solve the pixel headlamp projection image quality difference of light emitting diode as light source, sideline fuzzy problem, realize high quality, high light efficiency imaging. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiments will be simply introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.
[0020] Figure 1 The laser pixel projection headlamp structure schematic view provided by the utility model embodiment is shown in the figure.
[0021] Figure 2 A second lens group MTF schematic diagram provided by the embodiment of the utility model;
[0022] Figure 3 A system point column diagram provided by the embodiment of the utility model;
[0023] Figure 4 A system relative luminance schematic diagram provided by the embodiment of the utility model;
[0024] Mark explanation:
[0025] 1-laser, 2-G1 lens, 3-first mirror, 4-second mirror, 5-fluorescent powder, 6-protective glass, 7-G2 lens, 8-G3 lens, 9-liquid crystal panel, 10-G4 lens, 11-G5 lens, 12-G6 lens, 13-G7 lens. Specific implementation
[0026] The technical scheme 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 the person skilled in the art without creative labor fall within the scope of the utility model.
[0027] The utility model aims at providing a kind of laser pixel projection headlamp, solve the problem of projection image quality difference, borderline fuzzy of pixel headlamp with light-emitting diode as light source.
[0028] 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 with reference to the drawings and specific implementation.
[0029] Figure 1 The laser pixel projection headlamp structure schematic diagram provided by the embodiment of the utility model is as shown in Figure 1 As shown, the utility model provides a kind of laser pixel projection headlamp, including: laser 1, two G1 lenses 2, G2 lens 7, G3 lens 8, G4 lens 10, G5 lens 11, G6 lens 12, G7 lens 13, first mirror 3, second mirror 4, fluorescent powder 5, protective glass 6 and liquid crystal panel 9;
[0030] The G2 lens 7 and the G3 lens 8 constitute a first lens group; the G4 lens 10, the G5 lens 11, the G6 lens 12 and the G7 lens 13 constitute a second lens group; the blue laser emitted by the laser 1 passes through the first G1 lens 2, the first reflector 3, the second reflector 4, the second G1 lens 2, the fluorescent powder 5, the second G1 lens 2, the protective glass 6, the first lens group, the liquid crystal panel 9 and the second lens group in sequence;
[0031] The laser 1 is used for generating blue laser; the G1 lens 2 is used for adjusting the angle of light; the first reflector 3 and the second reflector 4 are both used for folding the light path; the fluorescent powder 5 is used for exciting and reflecting colored light; the first lens group is used for adjusting the pupil size of the system; and the second lens group is used for imaging projection.
[0032] Preferably, the materials of the G1 lens 2, the G2 lens 7, the G3 lens 8, the G4 lens 10, the G5 lens 11, the G6 lens 12, the G7 lens 13, the first reflector 3, the second reflector 4 and the protective glass 6 are all glass.
[0033] Specifically, the first lens group and the second lens group both have positive focal power.
[0034] Further, the G1 lens 2, the G2 lens 7, the G3 lens 8, the G4 lens 10, the G5 lens 11, the G6 lens 12 and the G7 lens 13 are all spherical lenses.
[0035] Specifically, the front intercept of the G1 lens 2 is less than 1 mm; and the ratio of the outer diameter of the G1 lens 2 to the focal length ranges from 1.5 to 2.0.
[0036] Further, the ratio of the outer diameter of the G3 lens 8 to the focal length ranges from 1.5 to 2.0.
[0037] Specifically, the ratio of the effective focal length of the second lens group to the effective focal length of the first lens group ranges from 80 to 90.
[0038] Further, the ratio of the distance between the G4 lens 10 and the G7 lens 13 to the distance between the G4 lens 10 and the liquid crystal panel 9 ranges from 11 to 13.
[0039] Specifically, the ratio of the total length of the light path from the laser 1 to the fluorescent powder 5 to the effective focal length of the first lens group is less than 2.
[0040] Specifically, the specific parameters of the G2 lens 7 to the G7 lens 13 are shown in Table 1.
[0041] Table 1
[0042]
[0043] wherein, Nd is the refractive index of the optical glass at a specified wavelength of 587.6 nm (helium D line). The surface number corresponds to one or two surfaces of the right device. Vd represents the dispersion value of the optical material.
[0044] Reference Figure 2 The MTF (Modulation Transfer Function) index is the most accurate and scientific evaluation standard for the lens at present. 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 logarithm per millimeter line. The MTF values of the fields of view of the embodiments are all above 0.5 at the design resolution, and the corresponding design resolution is 11 lines per millimeter. It can be seen that the MTF (Modulation Transfer Function) of the lens at low, medium and high frequencies is very good, and it can be analyzed that it has a high resolution effect. Among them, the OTF modulus is the modulus of the optical transfer function, which can represent the performance of most imaging systems.
[0045] Reference Figure 3 Many light rays emitted from a point pass through the optical system, and due to aberration, the intersection points with the image plane are no longer concentrated at the same point, but form a dispersed pattern within a certain range, which is called a point column diagram. The point column diagram is one of the most commonly used evaluation methods in modern optical design. The root mean square diffraction spot size of the system imaging end image quality analysis, the minimum distinguishable and mapping projection base map pattern line width is 0.05mm. Among them, the RMS radius (root mean square spot radius) is an index for describing the size of the light beam, which is obtained by taking the square root of the quadratic average of the light intensity distribution. The GEO radius represents the radius of the center circle containing all the light rays. The image plane refers to the projection imaging plane position. The object plane refers to the liquid crystal panel, and the radius refers to half of the diagonal length of the liquid crystal panel.
[0046] Reference Figure 4 The relative luminance is the ratio of the luminance of different coordinate points in the image plane to the luminance of the center point, and the ordinate represents the normalized luminance value, and the abscissa represents the field angle of the lens. Under the same conditions, the transition of the relative luminance curve of each field is smooth, which represents that the luminance in the projection frame is uniform, and the closer the relative luminance value of each field is to 1, the higher the final projection brightness is. As can be seen from the relative luminance diagram, the projection lamp provided by the embodiment has high image plane luminance uniformity, and it can also be deduced that the system has high efficiency and high brightness. The principle of high brightness is that the numerical aperture = entrance pupil diameter / focal length. In the case of keeping the focal length unchanged, the larger the numerical aperture, the larger the entrance pupil diameter, which means that the larger the entrance pupil, the more light energy can be received, so the brightness is higher. Among them, the X field (degree) refers to the position of the object point corresponding to the image point, which is characterized by the object field, and the maximum field of view is 10 degrees.
[0047] Further, the embodiment can have technical features of large-size imaging chip, large working distance, long back focus, short focus (i.e. small projection ratio), high image quality, high brightness, high efficiency, etc.
[0048] The utility model discloses the advantages are as follows:
[0049] The utility model takes into account luminance, system size and cost, solves the problem of poor projection image quality and blurred edge line of pixel headlamp with light emitting diode as light source, has the advantages of easy manufacturing, high light efficiency and high imaging quality.
[0050] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments.
[0051] The principle and implementation mode of the utility model are described by applying specific examples, and the description of the above embodiments is only for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation mode and application range will be changed according to the idea of the utility model. In conclusion, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A laser pixel projection headlight, characterized by, The application relates to a laser display device, comprising: a laser, two G1 lenses, a G2 lens, a G3 lens, a G4 lens, a G5 lens, a G6 lens, a G7 lens, a first reflector, a second reflector, fluorescent powder, protective glass and a liquid crystal panel. The G2 lens and the G3 lens form a first lens group; the G4 lens, the G5 lens, the G6 lens and the G7 lens form a second lens group; blue laser emitted by the laser passes through the first G1 lens, the first reflector, the second reflector, the second G1 lens, the fluorescent powder, the second G1 lens, the protective glass, the first lens group, the liquid crystal panel and the second lens group in sequence. The laser is used for generating blue laser; the G1 lens is used for adjusting the angle of light; the first reflector and the second reflector are used for folding the light path; the fluorescent powder is used for exciting and reflecting colored light; the first lens group is used for adjusting the pupil size of the system; and the second lens group is used for imaging projection. The G1 lens, the G2 lens, the G3 lens, the G4 lens, the G5 lens, the G6 lens, the G7 lens, the first reflector, the second reflector and the protective glass are all made of glass.
2. The laser pixel projection headlight of claim 1, wherein, The first lens group and the second lens group both have positive focal power.
3. The laser pixel projection headlight of claim 1, wherein, The G1 lens, the G2 lens, the G3 lens, the G4 lens, the G5 lens, the G6 lens and the G7 lens are all spherical lenses.
4. The laser pixel projection headlight of claim 1, wherein, The front intercept of the G1 lens is less than 1 mm; and the ratio of the outer diameter of the G1 lens to the focal length ranges from 1.5 to 2.
0.
5. The laser pixelated headlamp of claim 1, wherein, The ratio of the outer diameter of the G3 lens to the focal length ranges from 1.5 to 2.
0.
6. The laser pixelated headlamp of claim 1, wherein, The ratio of the effective focal length of the second lens group to the effective focal length of the first lens group ranges from 80 to 90.
7. The laser pixelated headlamp of claim 1, wherein, The ratio of the distance from the G4 lens to the G7 lens to the distance from the G4 lens to the liquid crystal panel ranges from 11 to 13.
8. The laser pixelated headlamp of claim 1, wherein, The ratio of the total length of the light path from the laser to the fluorescent powder to the effective focal length of the first lens group is less than 2.
9. The laser pixelated headlamp of claim 1, wherein,