CN220271586U

CN220271586U - Fly's eye lens and projection light path thereof

Info

Publication number: CN220271586U
Application number: CN202321947247.5U
Authority: CN
Inventors: 王智锋; 饶钦和
Original assignee: Lianhui Intelligent Technology Zhongshan Co ltd
Current assignee: Lianhui Intelligent Technology Zhongshan Co ltd
Priority date: 2023-07-21
Filing date: 2023-07-21
Publication date: 2023-12-29
Anticipated expiration: 2033-07-21

Abstract

The utility model discloses a fly-eye lens and a projection light path thereof, wherein the fly-eye lens comprises a middle lens area and a circle of edge lens areas arranged at the outer edge of the middle lens area, the middle lens area comprises a plurality of first lens units which are arranged in an array and have the same size, the edge lens area comprises a plurality of sub-lens areas, the sub-lens areas comprise a plurality of second lens units which are surrounded at the outer edge of the middle lens area, and the size of each second lens unit is larger than that of the first lens unit. The projection light path includes a light source assembly, a fly eye lens as described above, and an imaging assembly arranged in sequence. The utility model has the advantages of low cost, reduced influence of broken edges on the picture, more uniform picture appearance, no reduction of brightness and no increase of volume.

Description

Fly's eye lens and projection light path thereof

Technical Field

The utility model relates to the technical field of fly-eye lenses, in particular to a fly-eye lens and a projection light path thereof.

Background

With the development of projection technology in recent years, projectors have been widely used in the fields of home use, education, office use, automobiles, etc., wherein most of the projector optical path designs require light homogenizing devices such as integrating columns, plastic compound eyes, glass compound eyes, etc. to participate in the homogenization treatment of light spots.

The existing compound eyes are basically formed by a die, particularly glass compound eyes, but the die formed compound eyes have poor edge processing precision, very many broken edges and defective products, low yield and natural high cost. Poor edge breakage can cause the uniformity of the picture to be reduced, and the abnormal problems such as rainbow halation or aperture and the like can be seen around the picture by carefully observing the white picture.

In the prior art, engineers often adopt two methods to avoid the abnormality, one is to increase the number of compound eye lenslets, ensure that a broken edge area avoids the boundary of an effective light spot, thereby reducing the influence on a picture, but the compound eye volume is increased more, and the cost is relatively increased; and the second is to uniformly increase the sizes of all fly's eye lenslets, so as to ensure that broken edges do not influence effective light of the picture. But this also increases the volume and the brightness loss is very high.

The present utility model has been made based on such a situation.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide the fly-eye lens and the projection light path thereof, which have low cost, can reduce the influence of the edge breaking problem on the picture, lead the picture to be more uniform, do not reduce the brightness and do not increase the volume.

The utility model can be realized by the following technical scheme:

in order to solve the technical problems, the utility model provides a fly-eye lens, which comprises a middle lens area and a circle of edge lens areas arranged at the outer edge of the middle lens area, wherein the middle lens area comprises a plurality of first lens units which are arranged in an array and have the same size, the edge lens area comprises a plurality of sub-lens areas, the sub-lens areas comprise a plurality of second lens units which are surrounded at the outer edge of the middle lens area, and the size of each second lens unit is larger than that of the first lens unit.

In order to further solve the technical problem, the present utility model provides a fly-eye lens, wherein the length m of the second lens unit is greater than the length s corresponding to the first lens unit, or the width n of the second lens unit is greater than the width t corresponding to the first lens unit, and the thickness, the radius of curvature and the refractive index of the material of each second lens unit are the same as those of the first lens unit.

In order to further solve the technical problem, the utility model provides a fly-eye lens, wherein the second lens units in each sub-lens area are arranged in a single row.

In order to further solve the technical problem to be solved, the utility model provides a fly-eye lens, wherein the edge lens area and the middle lens area are integrally formed.

In order to further solve the technical problem to be solved, in the fly-eye lens provided by the utility model, each sub-lens area is spliced at the outer edge of the middle lens area in sequence.

The utility model can also be realized by the following technical scheme:

in order to solve the technical problems, the utility model also provides a projection light path which comprises a light source component, the fly-eye lens and an imaging component which are sequentially arranged.

In order to further solve the technical problem to be solved in the utility model, in the projection light path, the light source assembly comprises a red light source, a blue light source and a green light source, a first collimating lens group, a first light splitting filter for transmitting red light and reflecting blue light, a first relay lens and a second light splitting filter for transmitting green light and reflecting red light and blue light are sequentially arranged between the red light source and the fly eye lens, the blue light source faces the first light splitting filter, a second collimating lens group is arranged between the blue light source and the first light splitting filter, and the green light source faces the second light splitting filter, and a third collimating lens group is arranged between the blue light source and the fly eye lens.

In order to further solve the technical problem to be solved by the present utility model, in the projection optical path, the first collimating lens group includes a first collimating lens and a second collimating lens, the second collimating lens group includes a third collimating lens and a fourth collimating lens, and the third collimating lens group includes a fifth collimating lens and a sixth collimating lens.

In order to further solve the technical problem, the utility model provides a projection light path, wherein the imaging component comprises an imaging chip, a relay lens group and a beam splitting prism, wherein the relay lens group and the beam splitting prism are sequentially arranged between the imaging chip and the fly-eye lens.

In order to further solve the technical problem to be solved, the imaging chip is a DLP chip in the projection light path.

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

the utility model divides the fly-eye lens into a middle lens area and an edge lens area, and the size of each second lens unit in the edge lens area is larger than that of the first lens unit in the middle lens area. The utility model only increases the size of the second lens unit at the edge, not only obviously increases the volume of the compound eye, but also almost has no loss of brightness, reduces the requirement on the processing precision of the compound eye edge, effectively solves the problem of poor picture caused by compound eye edge breakage, has more uniform picture performance, and reduces the theoretical cost.

Drawings

The utility model is described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a front view of a fly-eye lens of the utility model;

FIG. 2 is a longitudinal cross-sectional view of the fly-eye lens of the utility model;

FIG. 3 is an exploded view of a second embodiment of the fly-eye lens of the utility model;

fig. 4 is a schematic diagram of the projected light path.

Detailed Description

In order to make the technical scheme of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and the detailed description.

Embodiment one of the fly-eye lens:

fig. 1 to 2 show a first embodiment of the present utility model, which is a fly-eye lens, and can be directly applied to various projection light paths, such as LCD projection, LCOS projection, DLP projection, etc. The eye dodging element comprises a middle lens area 1 and a circle of edge lens area 2 arranged at the outer edge of the middle lens area 1. The middle lens region 1 comprises a plurality of first lens units 11 which are arranged in an array and have the same size, the edge lens region 2 comprises a plurality of sub-lens regions 21, and the sub-lens regions 21 comprise a plurality of second lens units 211 which are surrounded on the outer edge of the middle lens region 1.

The principle of conventional fly-eye lenses is to image each lenslet onto the active surface of the target chip. Because the edges of the lenses are easy to break, if the sizes of the small lenses are too small, the small lenses cannot cover an image plane, and the halation phenomenon is serious; if the small lenses are too large in size, the coverage of the image surface is too much, which causes energy waste.

In order to solve the above-described problems, the present utility model divides a fly-eye lens (fly-eye lens) into a middle lens region 1 and an edge lens region 2, and the size of each of the second lens units 211 in the edge lens region 2 is larger than the size of the first lens unit 11 in the middle lens region 1. Since the energy of the spot edge is low, the size of the first lens unit 11 in the middle is kept small, and the size of the second lens unit 211 at the compound eye edge is increased, so that the brightness is hardly lost, and the poor picture caused by the compound eye edge breaking problem can be effectively solved.

The more specific reason is that:

regarding the middle lens region 1, the spot middle energy is high, the size of the middle first lens unit 11 is small, and the middle does not have the problem of edge breakage, so the smaller the size of the first lens unit 11 is, the less the brightness loss is, and the better the picture uniformity is;

regarding the edge lens region 2, the edge second lens unit 211 has a larger size, and firstly, even if some broken edges exist in the forming process of the edge small lens (namely the second lens unit 211) due to the process problem, the second lens unit 211 with a larger size can still ensure that the broken edge region avoids the boundary of an effective light spot, the broken edges can not influence effective light of a picture, and the picture abnormality caused by the broken edge lens can be overcome; secondly, since only the size of the second lens unit 211 at the edge is increased and the energy at the edge of the flare is low, although there is a loss of edge energy, the loss is not too large, the energy loss of the whole fly-eye lens is small, and the brightness loss is small; third, since only the size of the edge second lens unit 211 is increased, the size of the entire fly-eye lens is slightly increased, and the overall size is still relatively small.

More specifically, the cross sections of the first lens unit 11 and the second lens unit 211 are rectangular or approximately rectangular in shape. The length m of the second lens unit 211 is greater than the length s of the first lens unit 11, or the width n of the second lens unit 211 is greater than the width t of the first lens unit 11. Of course, one of the length and the width of the second lens unit 211 may be larger than that of the first lens unit 11.

In addition, the thickness, radius of curvature and refractive index of the material of each of the second lens units 211 and the first lens unit 11 are the same, so that uniformity of the screen can be further ensured.

More specifically, the second lens units 211 in each of the sub-lens regions 21 are arranged in a single row. That is, the edge lens region 2 includes only the outermost round of lenslets, i.e., the second lens unit 211, and the other lenslets are all the first lens unit 11.

More specifically, the edge lens region 2 and the intermediate lens region 1 are integrally molded. Further, the edge lens region 2 and the intermediate lens region 1 are preferably integrally injection molded by a mold.

Second embodiment of fly-eye lens:

as shown in fig. 3, a second embodiment of the present utility model is different from the first embodiment in that: each of the sub-lens regions 21 is sequentially spliced to the outer edge of the intermediate lens region 1. That is, the sub-lens regions 21 are spliced to the outer edge of the intermediate lens region 1 by means of adhesion or the like.

Projection light path embodiment:

fig. 4 shows a projection light path of the present utility model, which includes a light source assembly 3, the fly-eye lens, and an imaging assembly 4, which are disposed in sequence.

More specifically, the light source assembly 3 includes a red light source 31, a blue light source 32 and a green light source 33, a first collimating lens group 34, a first light splitting filter 35 for transmitting red light and reflecting blue light, a first relay lens 36, and a second light splitting filter 37 for transmitting green light and reflecting red light are sequentially disposed between the red light source 31 and the fly-eye lens, the blue light source 32 faces the first light splitting filter 35 and a second collimating lens group 38 is disposed therebetween, and the green light source 33 faces the second light splitting filter 37 and a third collimating lens group 39 is disposed therebetween. Preferably, the red light source 31, the blue light source 32 and the green light source 33 are LED light sources. The first and second spectral filters 35 and 37 each belong to a filter.

More specifically, the first collimating lens group 34 includes a first collimating lens 341 and a second collimating lens 342, the second collimating lens group 38 includes a third collimating lens 381 and a fourth collimating lens 382, and the third collimating lens group 39 includes a fifth collimating lens 391 and a sixth collimating lens 392. Preferably, the first collimating lens 341, the second collimating lens 342, the third collimating lens 381, the fourth collimating lens 382, the fifth collimating lens 391 and the sixth collimating lens 392 are all convex lenses.

More specifically, the imaging module 4 includes an imaging chip 41, a relay lens group 42 and a beam splitting prism 43 which are sequentially provided between the imaging chip 41 and the fly's eye lens. Preferably, the beam-splitting prism 43 includes two triangular prisms with a gap therebetween.

Further, the relay lens group 42 includes a second relay lens 421 and a third relay lens 422. Preferably, the second relay lens 421 and the third relay lens 422 are both convex lenses.

Further, the imaging chip 41 is a DLP chip.

As shown in fig. 4, the light paths of the respective colors are as follows:

1) Red light path: the red light beam emitted by the red LED (red light source 31) is collimated by the first collimating lens 341 and the second collimating lens 342, then passes through the first light splitting filter 35, passes through the first relay lens 36, is reflected by the second light splitting filter 37, then the reflected light spot passes through the fly eye lens, then passes through the second relay lens 421 and the third relay lens 422, enters the light splitting prism 43, is emitted into the DLP chip (imaging chip 41) through the total reflection surface of the light splitting prism 43, and then is vertically reflected out of the DLP chip through chip modulation, enters the lens, and is projected out of the picture.

2) Blue light path: the blue light beam emitted by the blue LED (blue light source 32) is collimated by the third collimating lens 381 and the fourth collimating lens 382, then reflected by the first light splitting filter 35, passes through the first relay lens 36, is reflected by the second light splitting filter 37, then the reflected light spot passes through the fly eye lens, then passes through the second relay lens 421 and the third relay lens 422, enters the light splitting prism 43, is emitted into the DLP chip (imaging chip 41) through the total reflection surface of the light splitting prism 43, and then is vertically reflected out of the DLP chip through chip modulation, enters the lens, and is projected out of the picture.

3) Green light path: the green light beam emitted by the green LED (green light source 33) is collimated by the fifth collimating lens 391 and the sixth collimating lens 392, then passes through the second beam splitting filter 37, the light spot passes through the fly eye lens, then enters the beam splitting prism 43 through the second relay lens 421 and the third relay lens 422, enters the DLP chip (imaging chip 41) through the total reflection surface of the beam splitting prism 43, then is vertically reflected out through the chip modulation, enters the lens, and projects the picture.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A fly's eye lens, characterized in that: including middle lens district (1) and round establish in marginal lens district (2) of middle lens district (1) outward flange, middle lens district (1) are including a plurality of first lens unit (11) that are array arrangement and the size is the same all, marginal lens district (2) include a plurality of sub-lens district (21), sub-lens district (21) include a plurality of enclose second lens unit (211) at the outward flange of middle lens district (1), each the size of second lens unit (211) all is greater than the size of first lens unit (11).

2. A fly-eye lens as claimed in claim 1, wherein: the length m of the second lens unit (211) is larger than the length s corresponding to the first lens unit (11), or the width n of the second lens unit (211) is larger than the width t corresponding to the first lens unit (11), and the thickness, the curvature radius and the material refractive index of each second lens unit (211) are the same as those of the first lens unit (11).

3. A fly-eye lens as claimed in claim 1, wherein: the edge lens region (2) and the middle lens region (1) are integrally formed.

4. A fly-eye lens as claimed in claim 1, wherein: each sub-lens region (21) is spliced at the outer edge of the middle lens region (1) in turn.

5. A projection light path, characterized by: comprising a light source assembly (3), a fly-eye lens according to any of claims 1-4, and an imaging assembly (4) arranged in sequence.

6. A projection light path as claimed in claim 5, wherein: the light source assembly (3) comprises a red light source (31), a blue light source (32) and a green light source (33), a first collimating lens group (34), a first light splitting filter (35) for transmitting red light and reflecting blue light, a first relay lens (36) and a second light splitting filter (37) for transmitting green light and reflecting red light are sequentially arranged between the red light source (31) and the fly eye lens, the blue light source (32) faces the first light splitting filter (35) and is provided with a second collimating lens group (38) between the blue light source and the first light splitting filter, and a third collimating lens group (39) is arranged between the green light source (33) and the second light splitting filter (37).

7. A projection light path as claimed in claim 6, wherein: the first collimating lens group (34) comprises a first collimating lens (341) and a second collimating lens (342), the second collimating lens group (38) comprises a third collimating lens (381) and a fourth collimating lens (382), and the third collimating lens group (39) comprises a fifth collimating lens (391) and a sixth collimating lens (392).

8. A projection light path as claimed in claim 5, wherein: the imaging assembly (4) comprises an imaging chip (41), a relay lens group (42) and a beam splitting prism (43) which are sequentially arranged between the imaging chip (41) and the fly eye lens.

9. A projection light path as claimed in claim 8, wherein: the imaging chip (41) is a DLP chip.