CN115508923A - Fly-eye lens, projection illumination light path and projection device - Google Patents
Fly-eye lens, projection illumination light path and projection device Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0043—Inhomogeneous or irregular arrays, e.g. varying shape, size, height
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
Abstract
The embodiment of the application discloses a fly-eye lens, a projection illumination light path and a projection device, wherein the fly-eye lens comprises a first dodging area and a second dodging area, and the second dodging area comprises a second effective optical area arranged around the first dodging area; the first dodging area comprises a plurality of first micro-lens units which are arranged in an array; the second effective optical area comprises a plurality of second micro lens units, the second micro lens units are arranged around the first light homogenizing area in an array mode, and the size of each second micro lens unit is smaller than that of each first micro lens unit. The fly-eye lens provided by the embodiment of the application can improve the light effect and the dodging effect, so that the optical performance of the projection device can be improved.
Description
Technical Field
The application belongs to the technical field of optical elements, and specifically relates to a fly-eye lens, a projection illumination light path and a projection device.
Background
In order to ensure the image quality of the projection picture, a light homogenizing element is usually required to be arranged in the projection device. Fly-eye lenses are a form of Light homogenizing element, and have become popular in recent years for use in projection devices such as Digital Light Processing (DLP) projection engines.
In the prior art, a fly-eye lens includes a substrate and a plurality of microlenses arranged in an array on the substrate. Theoretically, the larger the number of microlenses included in the fly-eye lens, and the smaller the size of each microlens, the better the dodging effect will be. This has the disadvantage that there are more gaps between the microlenses on the substrate, which results in a loss of optical efficiency. Generally, the greater the number of gaps on a fly-eye lens, the greater the light efficiency loss.
Therefore, the existing fly-eye lens cannot give consideration to the light uniformizing effect and the reduction of the light effect loss.
Disclosure of Invention
The embodiment of the application aims to provide a new technical scheme of a fly-eye lens, a projection illumination light path and a projection device.
According to a first aspect of embodiments of the present application, there is provided a fly-eye lens including a first dodging region and a second dodging region including a second effective optical region disposed around the first dodging region;
the first dodging area comprises a plurality of first micro lens units which are arranged in an array;
the second effective optical area comprises a plurality of second micro lens units, the second micro lens units are arranged around the first light homogenizing area in an array mode, and the size of each second micro lens unit is smaller than that of each first micro lens unit.
Optionally, in a thickness direction of the fly-eye lens, a thickness H1 of the first smoothing zone is greater than a thickness H2 of the second smoothing zone.
Optionally, the shape of the second microlens unit is the same as the shape of the first microlens unit and is scaled down.
Optionally, the light-passing surfaces of the first microlens unit and the second microlens unit are both rectangular, the length of the long edge of the first microlens unit is L1, the length of the long edge of the second microlens unit is L2, and the following conditions are satisfied: L1/L2= H1/H2.
Optionally, the fly-eye lens further comprises a third dodging region comprising a third effective optical region disposed around the second dodging region;
the third effective optical area comprises a plurality of third micro lens units, the third micro lens units are arranged in an array mode around the peripheral side of the second light homogenizing area, and the size of each third micro lens unit is smaller than that of each second micro lens unit.
Optionally, in a thickness direction of the fly-eye lens, a thickness H2 of the second patch is greater than a thickness H3 of the third patch, and a surface of the fly-eye lens forms a stepped structure that gradually decreases from a middle portion to a peripheral side.
Optionally, the third microlens unit has the same shape as the first and second microlens units, and is scaled down in accordance with the size of the second microlens unit.
Optionally, the third microlens unit is rectangular, and the length of a long side of the third microlens unit is L3;
the size relationship between the third micro-lens unit and the second micro-lens unit satisfies the following conditions: L2/L3= H2/H3;
and L2 is the length of the long edge of the second microlens unit, and H2 is the thickness of the second light homogenizing area.
According to a second aspect of embodiments of the present application, there is also provided a projection illumination light path, comprising a collimating lens group; and
the fly-eye lens of the first aspect is configured to perform uniform light processing on the light spot collimated by the collimating lens group.
Optionally, the projection illumination light path further includes a light source and a dichroic mirror group, the light source is located on one side of the collimating lens group where light enters, and the dichroic mirror group is located between the collimating lens group and the fly eye lens;
light rays emitted by the light source form parallel light beams after passing through the collimating lens group, the parallel light beams are transmitted and/or reflected by the color separation lens group, and all the light beams enter the fly eye lens after being combined.
According to a third aspect of the embodiments of the present application, there is further provided a projection apparatus, including the projection illumination optical path of the second aspect, and a display chip and a projection lens group.
The beneficial effects of the embodiment of the application are that:
the embodiment of the application provides a fly-eye lens which can be used for carrying out dodging treatment on collimated light rays, the fly-eye lens is designed to be large in size and small in number of micro lens units on a middle area, so that the number of gaps among the micro lens units in the middle area is small, and light energy loss caused by the gaps can be effectively reduced aiming at the characteristic that the central energy density of the collimated light rays is large; for the edge area, as the size of the micro lens units on the edge area is reduced and the number of the micro lens units is increased, the uniformity of the light spots is effectively improved. The scheme of the embodiment of the application realizes the dodging effect and reduces the light effect loss synchronously.
Other features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a fly-eye lens according to an embodiment of the present disclosure;
fig. 2 is a second schematic structural diagram of a fly-eye lens according to an embodiment of the present disclosure;
fig. 3 is a third schematic structural diagram of a fly-eye lens according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a projection illumination optical path provided in an embodiment of the present application;
FIG. 5 is a diagram showing a simulation of parallel light rays obtained after collimation by the collimating lens group;
FIG. 6 is a diagram showing the effect of light rays before dodging by a fly-eye lens;
fig. 7 is a diagram of the light effect after dodging by the fly-eye lens.
Description of reference numerals:
10. a first light homogenizing zone; 11. a first microlens unit; 20. a second light homogenizing area; 21. a second microlens unit; 22. a second effective optical area; 23. a second support region; 30. a third light homogenizing area; 31. a third microlens unit; 32. a third effective optical area; 33. a third support region; 40. a fly-eye lens; 51. a green light source; 52. a blue light source; 53. a red light source; 61. a blue-reflecting red-transmitting filter plate; 62. a red-blue-reflecting green-transmitting filter plate; 70. a collimating lens group.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.
The embodiment of the present application provides a fly-eye lens, which can be applied to a projection device, such as a Digital Light Processing (DLP) projection optical machine. The fly-eye lens can be used for carrying out dodging treatment on the collimated light, so that the quality of projection imaging is improved.
The embodiment of the present application provides a fly-eye lens, and referring to fig. 1 to 3, a fly-eye lens 40 includes a first dodging region 10 and a second dodging region 20, where the second dodging region 20 includes a second effective optical region 22 disposed around the first dodging region 10;
the first light homogenizing zone 10 comprises a plurality of first micro-lens units 11, and the first micro-lens units 11 are arranged in an array;
the second effective optical area 22 includes a plurality of second microlens units 21, the plurality of second microlens units 21 are arranged in an array around the first light homogenizing zone 10, and the size of the second microlens units 21 is smaller than that of the first microlens units 11.
In an embodiment of the present application, the fly-eye lens includes a first shim section 10 and a second shim section 20. The second homogenizing zone 20 can include a second support region 23 located in the middle, and a second effective optical region 22 disposed around the first homogenizing zone 10. The second effective optical area 22 is for transmitting light passing through the first homogenizing zone 10. Referring to fig. 3, in which the second support region 23 is opposite to the first smoothing region 10, the second effective optical region 22 may be an edge region of the second support region 23, that is, an edge region of the entire fly-eye lens 40. On this basis, the size of the first microlens element 11 on the first smoothing area 10 is designed to be larger than the size of the second microlens element 21 on the second smoothing area 20.
The second support region 23 is integrally connected with the first light homogenizing region 10 and the second support region 23, and the second support region 23 is used for transmitting light rays passing through the first light homogenizing region 10.
Of course, the fly-eye lens 40 is not limited to include the first homogenizing zone 10 and the second homogenizing zone 20, and may also include other homogenizing zones, and the sizes of the microlens units in different homogenizing zones may be designed differently, and may be adjusted according to specific situations, which is not limited in the embodiment of the present application.
In the fly-eye lens, in order to improve the uniformity effect on light, the size of the microlens units is reduced, but accordingly, the gap between the microlens units is increased, resulting in the loss of light efficiency. Therefore, the traditional compound eye lens is difficult to improve the light efficiency while improving the light homogenizing effect.
The fly-eye lens 40 of the embodiment of the present application includes at least a first homogenizing zone 10 and a second homogenizing zone 20, and the sizes of the microlens units disposed on the two homogenizing zones are different. When the light after collimation is homogenized, for example, the light at the center of the collimated light is uniform, and the light at the edge is poor in uniformity. The nature of the light after combining the collimation, fly-eye lens 40 of the embodiment of the application has set up the even light zone of difference, carries out even light processing through the light subregion to after the collimation, improves the even light effect to the light after the collimation. Specifically, the method comprises the following steps:
to the better characteristic of the central point department homogeneity of the light after the collimation, the scheme of this application has set up first even light zone 10 in fly eye lens 40, and the size of the first microlens unit 11 on this first even light zone 10 is great but can satisfy even light effect, and the clearance between the microlens unit on it is few to when guaranteeing even light effect, can effectively reduce the loss of light efficiency.
Aiming at the problem of poor uniformity at the edge position of the collimated light, in the scheme of the application, the second effective optical area 22 is designed at the corresponding position of the edge area of the fly-eye lens 40 corresponding to the part of the light, the size of the second micro-lens unit 21 in the second effective optical area 22 is smaller than that of the first micro-lens unit 11, and thus, good light uniformizing treatment on the light can be realized by using the small-size micro-lens unit.
That is to say, the fly-eye lens 40 provided in the embodiment of the present application can be used for performing light uniformizing processing on collimated light, and the fly-eye lens 40 is designed such that the size of the microlens units on the middle region is large and the number of the microlens units is small, so that the number of gaps between the microlens units in the middle region is small, and aiming at the characteristic of large central energy density of collimated light, the light uniformizing effect can be ensured, and at the same time, the light energy loss caused by the gaps can be effectively reduced; for the edge area, as the size of the micro lens units on the edge area is reduced and the number of the micro lens units is increased, the uniformity of light spots is effectively improved. The scheme of the embodiment of the application realizes improving the dodging effect and reducing the light effect loss synchronously.
In the thickness direction of the fly-eye lens, the thickness H1 of the first dodging area is larger than the thickness H2 of the second dodging area.
It should be noted that the size of the first microlens unit 11 is larger than that of the second microlens unit 21, which is not only expressed in a planar structure, but also different in thickness. Specifically, the thickness of the first microlens unit 11 is greater than that of the second microlens unit 21, which makes the thickness H1 of the first smoothing region 10 greater than the thickness H2 of the second smoothing region 20, and the surface of the fly-eye lens 40 provided by the present application is not a conventional planar structure, and the surface thereof appears in a non-flush state, as can be seen from the right side surface of the fly-eye lens 40 shown in fig. 2 and 3. The fly-eye lens 40 has a three-dimensional structure as a whole.
The surface of the fly-eye lens 40 for receiving light incident thereon is the light incident surface thereof, i.e., the right side surface of the fly-eye lens 40 shown in fig. 2 and 3. The surface of the fly-eye lens 40 for emitting the light after the dodging process is the light emitting surface, that is, the left side surface of the fly-eye lens 40 shown in fig. 2. The thickness direction of the fly-eye lens 40 is perpendicular to the direction from the light incident surface to the light emitting surface.
It should be noted that, in the optical structure, in order to ensure that the distance between the light emitted from the fly-eye lens 40 and the next optical element is the same, the light emitting surface of the fly-eye lens 40 is a plane, which can be referred to as the left side surface of the fly-eye lens 40 shown in fig. 2.
In the embodiment of the present application, referring to fig. 2, in the thickness direction of the fly-eye lens 40, the thickness of the first dodging region 10 is significantly higher than that of the second dodging region 20, and the first dodging region 10 and the second dodging region 20 can make the light incident surface of the fly-eye lens 40 form a stepped structure.
In some examples of the present application, the second microlens unit 21 has the same shape as the first microlens unit 11 and is scaled down.
Since the second microlens unit 21 is located on the edge region of the fly-eye lens 40, it is generally used to homogenize the edge rays of the collimated light, which have poor uniformity compared to the central rays. Therefore, it is necessary to use a microlens unit of a smaller size for the light uniformizing process, and in particular, the size of the second microlens unit 21 is smaller than that of the first microlens unit 11 in this application. Wherein the size of the microlens unit refers to the light transmission area and the thickness thereof.
Considering the overall dodging effect of the aligned light rays and ensuring the uniformity of the central light rays and the edge light rays, the second microlens unit 21 needs to be designed to be scaled down in equal proportion to the first microlens unit 11.
Optionally, referring to fig. 1, light-passing surfaces of the first microlens unit 11 and the second microlens unit 21 are both rectangular, a side length of a long side of the first microlens unit 11 is L1, a side length of a long side of the second microlens unit 21 is L2, and the following conditions are satisfied: L1/L2= H1/H2.
In the present embodiment, in the fly-eye lens, the second microlens unit 21 is scaled down in proportion to the first microlens unit 11, and therefore, the above relationship needs to be satisfied. Of course, the ratio of the side length of the short side of the first microlens unit 11 to the side length of the short side of the second microlens unit 21 is also equal to H1/H2.
For example, the length L1 of the long side of the first microlens unit 11 is 2.49mm, and the thickness thereof is equal to the thickness H1 of the first smoothing region 10 and 15mm. The length L2 of the long side of the second microlens unit 21 is 1.66mm, and the thickness thereof is equal to the thickness H2 of the second smoothing region 20 and is 10mm. Then: L1/L2= H1/H2=1.5.
Of course, the light-passing surfaces of the first microlens unit 11 and the second microlens unit 21 may also be circular, rhombic, and the like, which is not limited in the present application.
In some examples of the present application, the fly-eye lens 40 further comprises a third homogenizing zone 30, the third homogenizing zone 30 comprising a third effective optical region 32 disposed around the second homogenizing zone 20;
the third light homogenizing zone 30 includes a plurality of third microlens units 31, the plurality of third microlens units 31 are arranged in an array around the peripheral side of the second light homogenizing zone 20, and the size of the third microlens units 31 is smaller than that of the second microlens units 21.
Referring to fig. 1-3, in one embodiment of the present application, the third homogenizing zone 30 can include a third support region 33 located in the middle, and a third effective optical region 32 disposed around the third support region. The third support region 33 is disposed opposite to the second smoothing region 20, and the third effective optical region 32 is disposed around the second smoothing region 20. The third effective optical area 32 is integrally connected to the second light uniformizing area 20 for transmitting the light passing through the first light uniformizing area 10 and the second effective optical area 22. The third effective optical area 32 may cooperate with the second effective optical area 22 to further homogenize marginal ray segments of the collimated light.
The size of the third microlens unit 31 on the third effective optical area 32 is smaller, so that better dodging processing can be performed on the marginal light rays, and the dodging effect of the fly-eye lens 40 can be further improved.
In the thickness direction of the fly-eye lens 40, the thickness H2 of the second dodging area 20 is greater than the thickness H3 of the third dodging area 30, and the surface of the fly-eye lens 40 forms a stepped structure gradually decreasing from the middle portion to the peripheral side.
Specifically, the third microlens unit 31 has the same shape as the first and second microlens units 11 and 21, and is reduced in equal proportion to the size of the second microlens unit 21.
That is, referring to fig. 2, in the thickness direction of the fly-eye lens, the first homogenizing zone 10 located at the center is higher than the second homogenizing zone 20, the second homogenizing zone 20 is higher than the third homogenizing zone 30, the heights of the three homogenizing zones are different, and the light incident surface (i.e., the right side surface shown in fig. 2) of the fly-eye lens 40 forms a stepped structure gradually decreasing from the middle portion to the peripheral side.
In some examples of the present application, the light-passing surface of the third microlens unit 31 is rectangular, and the long side of the third microlens unit 31 has a side length L3; the size relationship between the third microlens unit 31 and the second microlens unit 21 satisfies: L2/L3= H2/H3; wherein L2 is the length of the long side of the second microlens unit 21, and H2 is the thickness of the second smoothing region 20.
For example, the first microlens unit 11 has a long side L1 of 2.49mm and a thickness H1 of 15mm. The second microlens unit 21 has a long side L2 of 1.66mm and a thickness H2 of 10mm. The third microlens unit 31 has a long side L3 of 0.83mm and a thickness H3 of 5mm. Then: L2/L3= H2/H3= L1/L2= H1/H2=1.5.
In the fly-eye lens 40 of the embodiment of the present application, the size of the first microlens unit 11 on the first light homogenizing zone 10 in the center is larger, the size of the second microlens unit 21 on the second light homogenizing zone 20 between the first light homogenizing zone 10 and the third light homogenizing zone 30 is smaller (i.e. smaller than the size of the first microlens unit 11), the size of the third microlens unit 31 of the third light homogenizing zone 30 is smaller (i.e. smaller than the size of the second microlens unit 21), and meanwhile, in order to make the light homogenizing effect on the marginal light rays more excellent, the number of the second microlens units 21 and the number of the third microlens units 31 may be designed to be larger, that is, both the numbers of the second microlens units 21 and the third microlens units 31 are larger than the number of the first microlens units 11, and the number of the third microlens units 31 is larger than the number of the second microlens units.
It should be noted that the number of the dodging regions is not limited in the present application, and three dodging regions shown in fig. 1 may be provided, and four or more regions may be provided. It is only necessary to ensure that in the fly-eye lens 40: the light homogenizing areas are distributed from the center to the edge in sequence, the light passing area of the micro lens units arranged in the light homogenizing areas is reduced in sequence, the thickness is reduced in sequence, and the number is increased in sequence.
According to a second aspect of the embodiments of the present application, there is further provided a projection illumination light path, including a collimating lens group, and a fly eye lens 40 as described above, where the fly eye lens 40 is configured to perform uniform light processing on a light spot collimated by the collimating lens group 70.
The collimating lens group 70 is used for collimating the light rays into parallel light rays. However, the energy density of the light rays in the center of the parallel light rays obtained after being collimated by the collimating lens group 70 is large and the light rays are relatively uniform, and the energy density of the light rays in the edge position is small and the light rays are poor in uniformity. Referring to fig. 5 and 6, fig. 5 shows parallel light rays obtained after collimation by the collimating lens groupFig. 6 is a schematic diagram of light rays before collimation by a fly-eye lens. Wherein the luminous flux at the center position of the parallel light rays before collimation by the fly-eye lens 40 is 7000W/m 2 -8500W/m 2 And the luminous flux at the edge positions of the parallel light rays is gradually reduced, and the luminous flux at the most edge position is even less than 1500W/m 2 . The light flux difference of the whole light is large.
After the fly-eye lens 40 of the embodiment of the present application is used for performing uniform light processing, uniform distribution of luminous flux of collimated parallel light rays at each position is achieved. Referring to FIG. 7, the light flux of the light homogenized by the fly-eye lens 40 at each position is 5000W/m 2 -7000W/m 2 Meanwhile, the light flux of the whole light is uniform.
In some examples of the present application, the projection illumination light path further includes a light source and a dichroic mirror group, the light source is located at the light incident surface of the collimating lens group 70, and the dichroic mirror group is located between the collimating lens group 70 and the fly eye lens;
light emitted by the light source is converted into parallel light beams by the collimating lens group 70, and the parallel light beams are transmitted and/or reflected by the color separation lens group, and all the light beams are combined and then enter the fly eye lens 40.
In one specific example, referring to fig. 4, the projection illumination path includes a light source, a collimating lens group, a dichroic lens group, and a fly eye lens 40. The light source is a three-color LED light source, which includes a green light source 51, a blue light source 52 and a red light source 53, and all of which are disposed on the light incident surface of the collimating lens group.
The collimating lens group comprises three collimating lenses, the positions of the three collimating lenses correspond to the positions of the green light source 51, the blue light source 52 and the red light source 53 respectively, and the collimating lens group is used for collimating monochromatic light beams emitted by the green light source 51, the blue light source 52 and the red light source 53 into monochromatic parallel light beams.
The color separation lens group is arranged between the collimating lens group and the fly eye lens and is used for changing the light beam propagation path after the collimation of the collimating lens group and combining three monochromatic beams to emit the combined beams into the fly eye lens 40. The color separation lens group comprises a reverse blue and red transparent filter 61 and a reverse red and blue and green transparent filter 62 which are arranged in parallel. The anti-blue-transmitting-red filter 61 is for reflecting the blue light beam while transmitting the red light beam. The anti-red-blue-green-transmitting filter 62 is used for reflecting the red light beam and the blue light beam and transmitting the green light beam.
The following describes a light propagation path in the projection illumination light path provided by the present application with reference to fig. 4, where the direction indicated by the arrow is the propagation direction of the light:
green light rays emitted by the green light source 51 are collimated into green parallel light beams by the collimating lens group, and then enter the fly-eye lens 40 after being transmitted by the red-blue-green-transmitting filter 62;
blue light rays emitted by the blue light source 52 are collimated into blue parallel light beams by the collimating lens group, are firstly reflected to the anti-red-blue-green-transparent filter 62 by the anti-blue-red-transparent filter 61, and then enter the fly eye lens 40 after being reflected by the anti-red-blue-green-transparent filter 62;
the green light emitted by the green light source 51 is collimated into green parallel light beams by the collimating lens group, firstly transmitted to the anti-red-blue-green-transmitting filter 62 through the anti-blue-red-transmitting filter 61, and then reflected by the anti-red-blue-green-transmitting filter 62 to enter the fly eye lens 40;
therefore, the light beams emitted from the green light source 51, the blue light source 52, and the red light source 53 are combined and enter the fly eye lens 40, and the combined light beams are uniformized by the fly eye lens 40.
The application also provides a projection device, which comprises the projection illumination light path, the display chip and the projection lens group.
The projection device may be any one of a Liquid Crystal Display (LCD) projection device, a liquid crystal on silicon (LCoS) projection device, a Digital Light Processing (DLP) projection device, and a Laser (LD) projection device.
In a specific embodiment of the present application, when the DLP projection apparatus is used, the display chip is a DMD display chip. When the DLP projection device is used, the display chip with the corresponding size is selected according to the requirement. Taking the example that the fly-eye lens includes the first light homogenizing region 10, the second light homogenizing region 20, and the third light homogenizing region 30, the partial correspondence relationship between the size of the DMD display chip and the size of the fly-eye lens is shown in table 1 below.
TABLE 1
Referring to table 1 above, when a 0.2 inch DMD chip is selected, the fly-eye lens 40 preferably has the following dimensions:
area S1=0.54mm of the first microlens unit 2 Thickness H1=7.5mm;
area S2=0.4mm of the second microlens unit 2 Thickness H2=5mm;
area S3=0.2mm of the third microlens unit 2 Thickness H3=2.5mm;
total area of outer frame s =64mm 2 。
When a 0.23 inch DMD chip is selected, the fly-eye lens 40 preferably has the following dimensions:
the area S1=0.58mm of the first microlens unit 2 Thickness H1=7.5mm;
area S2=0.4mm of the second microlens unit 2 Thickness H2=5mm;
area S3=0.2mm of the third microlens unit 2 Thickness H3=2.5mm;
total area of outer frame s =64mm 2 。
When a 0.33 inch DMD chip is selected, the fly-eye lens 40 preferably has the following dimensions:
the area S1=0.9mm of the first microlens unit 2 Thickness H1=12mm;
area S2=0.6mm of the second microlens unit 2 Thickness H2=6mm;
area S3=0.3mm of the third microlens unit 2 Thickness H3=3mm;
total area of outer frame s =144mm 2 。
When a 0.47 inch DMD chip is selected, the fly-eye lens 40 preferably has the following dimensions:
area S1=1.0mm of the first microlens unit 2 Thickness H1=15mm;
the second minuteArea S2=0.8mm of lens unit 2 Thickness H2=10mm;
area S3=0.4mm of the third microlens unit 2 Thickness H3=2.5mm;
total area of outer frame s =625mm 2 。
The application provides a projection arrangement, light after the emergence of projection illumination light path jets into display chip, passes through the emergence of projection lens group after the display chip reflection.
Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.
Claims (11)
1. Fly-eye lens, comprising a first homogenizing zone (10) and a second homogenizing zone (20), the second homogenizing zone (20) comprising a second effective optical area (22) arranged around the first homogenizing zone (10);
the first light homogenizing zone (10) comprises a plurality of first micro lens units (11), and the first micro lens units (11) are arranged in an array;
the second effective optical area (22) comprises a plurality of second micro lens units (21), the second micro lens units (21) are arranged in an array around the first light homogenizing area (10), and the size of the second micro lens units (21) is smaller than that of the first micro lens units (11).
2. Fly-eye lens according to claim 1, wherein the thickness H1 of the first homogenizing zone (10) is greater than the thickness H2 of the second homogenizing zone (20) in the thickness direction of the fly-eye lens.
3. Fly-eye lens according to claim 1, wherein the shape of the second microlens unit (21) is the same as the shape of the first microlens unit (11) and is scaled down.
4. A fly-eye lens according to any one of claims 1 to 3, wherein the light-passing surfaces of the first microlens unit (11) and the second microlens unit (21) are both rectangular, the length of the long side of the first microlens unit (11) is L1, the length of the long side of the second microlens unit (21) is L2, and the following conditions are satisfied: L1/L2= H1/H2, wherein,
h1 is the thickness of the first smoothing zone (10), and H2 is the thickness of the second smoothing zone (20).
5. Fly-eye lens according to claim 1, further comprising a third homogenizing zone (30), the third homogenizing zone (30) comprising a third effective optical area (32) arranged around the second homogenizing zone (20);
the third effective optical area (32) comprises a plurality of third micro lens units (31), the third micro lens units (31) are arranged in an array around the peripheral side of the second light homogenizing area (20), and the size of the third micro lens units (31) is smaller than that of the second micro lens units (21).
6. The fly-eye lens according to claim 5, wherein in a thickness direction of the fly-eye lens, a thickness H2 of the second patch region (20) is larger than a thickness H3 of the third patch region (30), and a surface of the fly-eye lens forms a stepped structure which is gradually decreased from a middle portion to a peripheral side.
7. Fly-eye lens according to claim 5, wherein the third microlens unit (31) is shaped the same as the first and second microlens units (11, 21) and is scaled down equally according to the size of the second microlens unit (21).
8. A fly-eye lens according to any of claims 5 to 7, wherein the light-passing surface of the third microlens unit (31) is rectangular, and the length of the long side of the third microlens unit (31) is L3;
the third microlens unit (31) and the second microlens unit (21) satisfy a dimensional relationship: L2/L3= H2/H3;
wherein L2 is the length of the long side of the second micro-lens unit (21), and H2 is the thickness of the second light homogenizing zone (20).
9. A projection illumination light path, comprising:
a collimating lens group (70); and
fly-eye lens according to any of claims 1 to 8, wherein the fly-eye lens (40) is configured to homogenize the light spot collimated by the collimating lens group (70).
10. The projection illumination light path of claim 9, further comprising a light source located on the light incident side of the collimating lens group (70) and a dichroic group located between the collimating lens group (70) and the fly eye lens (40);
light rays emitted by the light source are converted into parallel light beams through the collimating lens group (70), the parallel light beams are transmitted and/or reflected by the color separation lens group, and all the light beams enter the fly eye lens (40) after being combined.
11. A projection apparatus comprising the projection illumination path of claim 9 or 10, and a display chip and a projection lens assembly.
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| CN202211154026.2A CN115508923B (en) | 2022-09-21 | 2022-09-21 | Fly-eye lens, projection illumination light path and projection device |
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| CN202211154026.2A CN115508923B (en) | 2022-09-21 | 2022-09-21 | Fly-eye lens, projection illumination light path and projection device |
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