High-pixel projection vehicle lamp

Abstract

The utility model discloses a high-pixel projection vehicle lamp, which comprises a white light source assembly, a first reflector and a second reflector, the white light source assembly comprises a white light unit used for emitting white light, and the first reflector is used for reflecting the white light and forming white reflected light; the colored light source assembly comprises a plurality of colored light units with different colors to synthesize colored light, and a second reflecting mirror used for reflecting the colored light to form colored reflected light; the projection lens group comprises a first lens with positive focal power, a first diaphragm, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a second diaphragm and a fifth lens with positive focal power which are sequentially arranged from the image side to the object side along the optical axis direction; and a DMD chip, a micro-mirror unit in the DMD chip has two states of "open" and "close", the white reflected light is emitted from the projection lens group when the micro-mirror unit is in the "open" state, and the color reflected light is emitted from the projection lens group when the micro-mirror unit is in the "close" state.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a high-pixel projection vehicle lamp. Background Technique

[0002] A projection headlamp is a kind of lamp that uses DLP (Digital Light Processing) technology to project pixel points onto the road surface through a DMD (Digital Micro-mirror Device) device. A single lamp can achieve high-precision ADB (Adaptive Driving Beam) lighting with 900,000 to 1.3 million pixels, or use its pixelated projection function to achieve functions such as video playback and symbol display.

[0003] DLP is digital light processing. First, the image signal is digitally processed, and then the light is projected. It is a technology for visual digital information display based on the digital micro-mirror device - DMD (Digital Micromirror Device) developed by TI (Texas Instruments, USA).

[0004] In existing in-vehicle projection headlamps, to achieve road surface lighting, the DLP module can only use a white light source, and its usage scenario is limited. To achieve color projection, an additional DLP module needs to be added, which uses RGB three-color light sources. This undoubtedly poses higher requirements for cost and space. Even if color LED light sources are popularized and white light illumination can be achieved through RGB beam combination, due to the increase in the number of light sources and the higher temperature dependence of red light sources, the overall reliability of the product will be lower, and the damage of any light source will have an adverse impact on vehicle driving safety.

[0005] Therefore, from the perspective of reducing production costs and integrating the white light projection illumination and color projection functions of vehicle projection headlamps at the same time, further improvement is needed on the structure of vehicle lamps. Content of the Utility Model

[0006] The purpose of the utility model is to provide a high-pixel projection vehicle lamp to solve the technical problem of integrating the white light projection illumination and color projection functions of vehicle projection headlamps at the same time.

[0007] The high-pixel projection vehicle lamp group of the utility model is realized as follows:

[0008] A high-pixel projection vehicle lamp includes:

[0009] A white light source assembly, which includes a white light unit for emitting white light and a first reflector for reflecting white light to form white reflected light;

[0010] A color light source assembly, which includes several color light units of different colors to synthesize color light, and a second reflector for reflecting the color light to form color reflected light;

[0011] A projection lens group, including a first lens with positive optical power, a first aperture stop, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a second aperture stop, and a fifth lens with positive optical power, which are arranged in sequence from the image side to the object side along the optical axis direction;

[0012] A DMD chip, in which the micromirror unit includes two states of "open" and "closed". When in the "open" state, white reflected light is emitted from the projection lens group, and when in the "closed" state, color reflected light is emitted from the projection lens group.

[0013] In an optional implementation case of the present invention, the white light unit and the second reflector are located above the DMD chip, and the color light unit and the first reflector are located below the color light unit.

[0014] In an optional implementation case of the present invention, the first reflector and the second reflector are formed with a bevel surface on the side end of the beam between the processed light emitted from the DMD chip and incident on the projection lens group.

[0015] In an optional implementation case of the present invention, the color light unit includes an X prism in the shape of a cuboid formed by gluing four right-angle prisms, and a blue LED, a green LED, and a red LED respectively arranged on three different side ends of the X prism.

[0016] In an optional implementation case of the present invention, the color light unit further includes a first condenser lens group arranged between the blue LED and the X prism, a second condenser lens group arranged between the green LED and the X prism, and a third condenser lens group arranged between the red LED and the X prism.

[0017] In an optional implementation case of the present invention, the color light unit includes a first dichroic filter and a second dichroic filter arranged in parallel, a blue LED arranged on the left side of the first dichroic filter, a green LED arranged on the left side of the second dichroic filter, and a red LED arranged on the right side of the second dichroic filter; where

[0018] The right end face of the first dichroic filter is coated with a blue-transmitting and red-green-reflecting dichroic film, and the left end face of the second dichroic filter is coated with a red-transmitting and blue-green-reflecting dichroic film.

[0019] In an optional implementation case of the present invention, the color light unit further includes a fly-eye lens for subdividing and homogenizing the light emitted after passing through the first dichroic filter and the second dichroic filter.

[0020] In an optional implementation case of the present utility model, the included angle between the normal of the light-emitting surface of the white light unit and the optical axis of the projection lens group is 55° to 65°.

[0021] In an optional implementation case of the present utility model, the included angle between the normal of the light-emitting surface of the colored light unit and the optical axis of the projection lens group is 55° to 65°.

[0022] In an optional implementation case of the present utility model, the distance between the DMD chip and the projection lens group is 33 to 37 mm.

[0023] By adopting the above technical solution, the present utility model has the following beneficial effects: The high-pixel projection vehicle lamp of the present utility model can achieve the integrated effect of white light projection illumination and color projection function of the high-pixel projection vehicle lamp through the cooperation of the white light source component and the color light source component with the DMD chip, enriching the scene function. It not only ensures the reliability and safety of driving illumination, but also makes the projection function more abundant, flexibly meeting different needs. The entire vehicle lamp projection system only uses one DMD chip, occupying a small volume, having a simple structure and low cost. Moreover, through the reasonable layout that the white light unit and the second reflector are located on the upper side of the DMD chip, and the colored light unit and the first reflector are located on the lower side of the colored light unit, the high-pixel projection vehicle lamp can improve the compactness of its internal space while ensuring the light effect. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the overall structure of the high-pixel projection vehicle lamp of Embodiment 1;

[0025] Figure 2 It is a schematic diagram of the optical path structure of the high-pixel projection vehicle lamp of Embodiment 1;

[0026] Figure 3 It is a schematic diagram of the structure of the projection lens group of the high-pixel projection vehicle lamp of Embodiment 1;

[0027] Figure 4 It is a timing diagram of the blue LED, green LED and red LED of the high-pixel projection vehicle lamp of Embodiment 1;

[0028] Figure 5 It is a schematic diagram of the overall structure of the high-pixel projection vehicle lamp of Embodiment 2;

[0029] Figure 6 It is a schematic diagram of the overall structure of the high-pixel projection vehicle lamp of Embodiment 3.

[0030] In the figure: white light LED 1, first reflector 2, X prism 3, blue light LED 5, green light LED 6, red light LED 7, first condenser lens 8, second condenser lens 9, DMD chip 10, first dichroic filter 11, second dichroic filter 12, projection lens group 13, first lens 131, first aperture 132, second lens 133, third lens 134, fourth lens 135, second aperture 136, fifth lens 137, dual-core LED chip 14, second reflector 15, fly-eye lens group 16. Detailed implementation mode

[0031] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the accompanying drawings.

[0032] Embodiment 1:

[0033] Please refer to Figures 1 to 4 As shown in the figure, this embodiment provides a high-pixel projection headlight, including: a white light source assembly, a color light source assembly, a projection lens group 13 and a DMD chip 10 used in cooperation.

[0034] Specifically, first, the white light source assembly includes a white light unit for emitting white light and a first reflector 2 for reflecting the white light to form white reflected light. The color light source assembly includes several different color light units to synthesize color light and a second reflector 15 for reflecting the color light to form color reflected light. The first reflector 2 and the second reflector 15 here can both be optionally free-form reflectors. The reflector with a free-form surface plays the role of both converging and reflecting and guiding at the same time, with a compact structure and a small occupied volume, which is beneficial to reducing the volume of the high-pixel projection headlight.

[0035] Secondly, the projection lens group 13 includes a first lens 131 with a positive focal power, a first aperture 132, a second lens 133 with a negative focal power, a third lens 134 with a positive focal power, a fourth lens 135 with a negative focal power, a second aperture 136, and a fifth lens 137 with a positive focal power arranged in sequence from the image side to the object side along the optical axis direction. Based on this projection lens group 13, the system F number is between 1.2 and 1.35, the imaging quality can reach the full field of view > ±7.8°, MTF > 0.6 @ 16.5 lp / mm, the back focal length can achieve the ratio of the back focal length to the focal length BFL / EFL > 0.7, the system length can be effectively shortened, and the ratio of the total length to the focal length TTL / EFL < 2.2 can be achieved.

[0036] In this embodiment, the surface type parameters of each lens are shown in Table 1:

[0037]

[0038] Furthermore, the micromirror unit in the DMD chip 10 includes two states: "open" and "closed". When in the "open" state, white reflected light is emitted from the projection lens group 13, and when in the "closed" state, colored reflected light is emitted from the projection lens group 13. Based on this, in this embodiment, the "open" and "closed" states of the DMD chip 10 are used to achieve color projection and white light projection illumination respectively, realizing function integration and reducing the volume and cost of high-pixel projection headlamps.

[0039] On the basis of the above structure, further, the white light unit and the second mirror 15 are located on the upper side of the DMD chip 10, and the color light unit and the first mirror 2 are located on the lower side of the color light unit. The white light unit includes a white light LED 1 and a third condenser lens group disposed between the white light LED 1 and the first mirror 2.

[0040] Next, an optional implementation case will be described with reference to the accompanying drawings. The color light unit includes an X prism 3 in the shape of a cuboid, and a blue light LED 5, a green light LED 6, and a red light LED 7 disposed on three different side ends of the X prism 3 respectively; based on this structure, an RGB optical path is formed. More specifically, the X prism 3 includes four identical right-angled prisms, and the inclined surfaces of adjacent right-angled prisms are glued to each other. Since the X prism 3 has a glued surface distributed in an "X" shape inside, different monochromatic light rays can be combined on the light-emitting surface of the X prism 3, that is, the X prism 3 can mix the three beams of light emitted by the blue light LED 5, the green light LED 6, and the red light LED 7. A beam splitting film is provided at the inclined surface of the right-angled prism to reflect or transmit red, green, and blue light, and the colors are combined on the light-emitting surface of the X prism 3. The X prism 3 has a simple structure, can achieve an ideal light mixing effect, reduce the number of optical elements and light loss at the same time, and a dark field (light-absorbing black body structure) can be set for each path of light to improve the contrast.

[0041] Based on the above structure, furthermore, the color light unit also includes a first condenser lens group disposed between the blue light LED 5 and the X prism 3, a second condenser lens group disposed between the green light LED 6 and the X prism 3, and a third condenser lens group disposed between the red light LED 7 and the X prism 3.

[0042] The first condenser lens group, the second condenser lens group, the third condenser lens group, and the third condenser lens group in this embodiment all include a condenser lens one 8 and a condenser lens two 9 used in cooperation, and both the condenser lens one 8 and the condenser lens two 9 can be optionally an array lens structure.

[0043] In addition, the following design is also made in this embodiment: The first mirror 2 and the second mirror 15 are cut flat on the side of the beam that exits the DMD chip 10 and then enters the projection lens group 13 to form a relief surface. In this structure, the blocking of the projection beam by the first mirror 2 and the second mirror 15 can be reduced, the light flux can be increased, and at the same time, the non-effective beams can be blocked, such as the beams scattered by the structural members, thereby reducing stray light; the back focal length requirement of the projection lens group 13 can also be reduced. Based on the above situation, the distance between the DMD chip 10 and the projection lens group 13 in this embodiment is 33 - 37 mm, thereby reducing the complexity of the projection lens group 13 and improving the projection effect.

[0044] In addition, it should be noted that the angle between the normal of the light-emitting surface of the white light unit and the optical axis of the projection lens group 13 is 55° - 65°. The angle between the normal of the light-emitting surface of the color light unit and the optical axis of the projection lens group 13 is 55° - 65°. In this structure, the first mirror 2 and the white light unit can be located on both sides of the DMD chip 10, and the light beam emitted by the white light unit is not blocked by the second mirror 15. Similarly, the second mirror 15 and the color unit can be located on both sides of the DMD chip 10, and the light beam emitted by the color unit is not blocked by the first mirror 2, realizing a compact spatial layout.

[0045] In summary, for the high-pixel projection headlamp of this embodiment, its specific usage process is as follows:

[0046] For color projection, using the "off" state of the micromirror units in the DMD chip 10, the blue LED 5, the green LED 6, and the red LED 7 are lit according to the Figure 4 shown timing, and the duty ratios are 32%, 49%, and 19%. During the output process of a frame of color image, the color image can be divided into the superposition of the R map, the G map, and the B map. Among them, the red LED 7 works at times T1 - T32, and the other LEDs are off. At the same time, according to the brightness of each pixel color, the time for the corresponding micromirror unit in the DMD chip 10 to remain in the "off" state is also different. For example, for a pixel with a 255R value, its corresponding micromirror remains in the "off" state throughout T1 - T32, while for a pixel with a 127R value, its corresponding micromirror only remains in the "off" state for half of the time in T1 - T32. According to the input R map data (Rbitmap), the micromirrors corresponding to each pixel respectively output R light for a certain time to form an R map projection with different brightness values; in the time period T33 - T81, the green LED 6 works, and the DMD micromirrors work according to the G bitmap to project and output the G map; in the time period T82 - T100, the blue LED 5 works, and the DMD micromirrors work according to the B bitmap to project and output the B map; because the display time of each image is extremely short, a color picture is synthesized using the human eye's visual persistence.

[0047] During the color projection process, the light propagates in the direction of the solid line. The large-angle light emitted by the blue LED 5, the green LED 6, and the red LED 7 is collimated into a beam with a smaller divergence angle by the condenser lens 1 8 and the condenser lens 2 9 respectively. Through the collimating lens, the light beam emitted by the LED with a divergence angle within ±65° can be collected and collimated into a light beam with a divergence angle of about ±7° to 9°, thereby improving the light efficiency. The number of lenses in the condenser lens 1 8 and the condenser lens 2 9 corresponds to the number of LEDs, usually 1 to 3. The more the number of LEDs, the higher the projection brightness can be achieved. The collimated R, G, and B light beams will enter the X prism 3. Through the X prism 3, the R, G, and B light beams are reflected or transmitted respectively, and finally enter the second mirror 15 from the same direction. After being folded and shaped by the second mirror 15, the folding angle is to irradiate a rectangular light spot of a certain size on the DMD chip 10. Among them, the micromirror unit in the DMD chip 10 is in the "off" state, and the micromirror angle is -12°, which just reflects the incident R / G / B light into the projection lens group 13 and forms a color pixel point through projection.

[0048] For white light projection, the "on" state of the micromirror unit in the DMD chip 10 is utilized. In the entire time sequence, the white light LED 1 continuously works, and the time for the micromirror unit corresponding to the pixel to remain in the "on" state is determined by the gray value of the corresponding pixel. During the projection process, the light path propagates along the dotted line. First, it is collimated by the condenser lens 1 8 and the condenser lens 2 9, so that the light beam with a divergence angle of ±65° emitted by the LED is converged into a small-angle light beam with a maximum divergence angle of 8 to 11°. The condenser lens 1 8 and the condenser lens 2 9 are an array lens structure, and the number of their micromirrors is the same as the number of LEDs used, which is 1 to 4. More LEDs can achieve higher brightness output. The collimated light beam will be folded and shaped by the first mirror 2 and irradiate the DMD surface with a rectangular light spot of a certain size. When the micromirror unit in the DMD chip 10 is in the "on" state, the micromirror angle is +12°, and the incident white light can be reflected into the projection lens group 13 to form a white light pixel point through projection.

[0049] Embodiment 2:

[0050] Please refer to Figure 5As shown in the figure, based on the high-pixel projection headlight in Embodiment 1, the high-pixel projection headlight provided in this embodiment has the same general structure as that in Embodiment 1, with the difference lying in the color light unit. The color light unit adopted in this embodiment includes a first dichroic filter 11 and a second dichroic filter 12 arranged in parallel, a blue LED 5 provided on the left side of the first dichroic filter 11, a green LED 6 provided on the left side of the second dichroic filter 12, and a red LED 7 provided on the right side of the second dichroic filter 12. The right end face of the first dichroic filter 11 is coated with a blue-transmitting and red-green-reflecting dichroic film, with a cut-off wavelength near 480 ± 20 nm. The left end face of the second dichroic filter 12 is coated with a red-transmitting and blue-green-reflecting dichroic film, with a cut-off wavelength near 590 ± 20 nm.

[0051] Based on the above structure, the color light unit adopted in this embodiment further includes a fly-eye lens 16 for finely dividing and homogenizing the light emitted after passing through the first dichroic filter 11 and the second dichroic filter 12.

[0052] Embodiment 3:

[0053] Please refer to Figure 6 As shown in the figure, based on the high-pixel projection headlight in Embodiment 2, the high-pixel projection headlight provided in this embodiment has the same general structure as that in Embodiment 2, with the difference lying in the color light unit. The single-core chips of the R and B light sources in Embodiment 2 are replaced with dual-core LED chips 14. After the R / B light beams are collimated by the first condenser lens 8 and the second condenser lens 9, there is an included angle of 14° to 24°. To make the emission directions of the R, G, and B light beams consistent, there is an included angle of 7° to 12° between the first dichroic filter 11 and the second dichroic filter 12 adopted in this embodiment. The subsequent light propagation process is the same as that in Embodiment 1.

[0054] In the above specific embodiments, the purpose, technical solution, and beneficial effects of the present invention have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0055] In the description of the present invention, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0056] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0057] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0058] In addition, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0059] In the present utility model, unless otherwise clearly defined and limited, the first feature being above or below the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

Claims

1. A high-pixel projection headlight, characterized in that, Comprising: A white light source assembly, which includes a white light unit for emitting white light and a first reflector for reflecting the white light to form white reflected light; A color light source assembly, which includes several different color light units for synthesizing color light and a second reflector for reflecting the color light to form color reflected light; A projection lens group, including a first lens with a positive focal power, a first diaphragm, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a second diaphragm, and a fifth lens with a positive focal power, which are sequentially arranged from the image side to the object side along the optical axis direction; A DMD chip, in which the micromirror unit includes two states of "open" and "closed". When in the "open" state, the white reflected light is emitted from the projection lens group, and when in the "closed" state, the color reflected light is emitted from the projection lens group.

2. The high-pixel projection headlamp according to claim 1, wherein The white light unit and the second reflector are located above the DMD chip, and the color light unit and the first reflector are located below the color light unit.

3. The high-pixel projection headlamp according to claim 2, wherein, The first reflector and the second reflector are formed with a mating surface after being cut flat on one side of the light beam that is emitted to the projection lens group after being processed by the DMD chip.

4. The high-pixel projection headlamp according to claim 1 or 2, characterized in that, The color light unit includes an X prism in the shape of a cuboid formed by gluing four right-angle prisms, and a blue LED, a green LED, and a red LED respectively arranged on three different side ends of the X prism.

5. The high-pixel projection headlamp according to claim 4, wherein, The color light unit further includes a first condenser lens group arranged between the blue LED and the X prism, a second condenser lens group arranged between the green LED and the X prism, and a third condenser lens group arranged between the red LED and the X prism.

6. The high-pixel projection headlamp according to claim 1 or 2, characterized in that, The color light unit includes a first dichroic filter and a second dichroic filter arranged in parallel, a blue LED arranged on the left side of the first dichroic filter, a green LED arranged on the left side of the second dichroic filter, and a red LED arranged on the right side of the second dichroic filter; wherein The right end face of the first dichroic filter is coated with a dichroic film that transmits blue light and reflects red and green light, and the left end face of the second dichroic filter is coated with a dichroic film that transmits red light and reflects blue and green light.

7. The high-pixel projection headlamp according to claim 6, wherein The color light unit further includes a fly-eye lens for subdividing and homogenizing the light emitted after passing through the first dichroic filter and the second dichroic filter.

8. The high-pixel projection headlamp according to claim 1, characterized in that, The angle between the normal of the light-emitting surface of the white light unit and the optical axis of the projection lens group is 55° to 65°.

9. The high-pixel projection headlamp according to claim 1 or 8, characterized in that, The angle between the normal of the light-emitting surface of the color light unit and the optical axis of the projection lens group is 55° to 65°.

10. The high-pixel projection headlamp according to claim 1 or 2, characterized in that, The distance between the DMD chip and the projection lens group is 33 to 37 mm.

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