CN210376852U

CN210376852U - Miniaturized continuous zooming laser projection objective lens

Info

Publication number: CN210376852U
Application number: CN201921175751.1U
Authority: CN
Inventors: 张志锋; 刘卫林; 古小建
Original assignee: Shenzhen Point Electronic Tech Co ltd
Current assignee: Shenzhen Point Electronic Tech Co ltd
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2020-04-21
Anticipated expiration: 2029-07-25

Abstract

The utility model discloses a miniaturized continuous zooming laser projection objective lens, which comprises a digital micromirror device DMD body, a protective window, a TIR prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture diaphragm, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a second plane reflector, a first plane reflector and a free-form surface reflector, wherein the outside of the digital micromirror device DMD body is provided with a lens shell, one end of the lens shell is provided with the TIR prism, one end of the TIR prism is sleeved with the protective window, one end of the protective window is connected with the DMD body, the other end of the TIR prism is provided with the first lens, the other end of the first lens is provided with the second lens, the miniaturized continuous zooming laser projection objective lens has simple structure and convenient operation, and the optical system greatly shortens the overall dimension through a folding mode, the miniaturization of the external dimension of the laser projector is facilitated.

Description

Miniaturized continuous zooming laser projection objective lens

Technical Field

The utility model relates to a laser projection technical field specifically is a miniaturized laser projection objective that zooms in succession.

Background

In the laser projection field, along with the power of blue laser source constantly improves to and the breakthrough of free-form surface speculum processing technique, adopt the ultrashort burnt projection product of free-form surface speculum to be put on the market rapidly, its advantage mainly shows: on the premise of ensuring the image definition, the projection distance is greatly shortened, in the ultra-short-focus laser projector, a projection objective is a key component for realizing projection and determining the image quality, in order to pursue the imaging quality, the optical system of the projection objective is complex in design and adopts a large number of aspheric surfaces, so that the imaging quality of the optical system is unstable due to processing, adjustment and other reasons in the batch production process, and the ultra-short-focus laser projector is the same as the factors, so that the ultra-short-focus laser projector generally has the defects of large overall dimension, high price, uneven imaging quality and obviously reduced imaging quality when the projection dimension of a picture is changed. For all these reasons, consumers are ultimately kept at a premium; in view of these drawbacks, it is necessary to design a compact continuous-zoom laser projection objective.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a miniaturized laser projection objective of zooming in succession to solve the problem that proposes among the above-mentioned background art.

In order to solve the technical problem, the utility model provides a following technical scheme: a miniaturized continuous zooming laser projection objective lens comprises a digital micromirror device DMD body, a protective window, a TIR prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture diaphragm, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a second plane reflector, a first plane reflector, a free-form surface reflector and a lens shell, wherein the outside of the digital micromirror device DMD body is provided with the lens shell, one end of the lens shell is provided with the TIR prism, one end of the TIR prism is sleeved with the protective window, one end of the protective window is connected with the digital micromirror device DMD body, the other end of the TIR prism is provided with the first lens, the other end of the first lens is provided with the second lens, the first lens and the second lens are both positioned at one side of the center inside the lens shell, one end of the second lens is provided with the fourth lens, a third lens is sleeved on one side of the fourth lens, the third lens is positioned on one side of the second lens, a fifth lens is arranged at the other end of the fourth lens, a sixth lens is arranged at one end of the fifth lens, aperture diaphragms are arranged at the centers of the fifth lens and the sixth lens, a seventh lens is arranged on one side of the sixth lens, an eighth lens is arranged on one side of the seventh lens, a ninth lens is arranged on one side of the eighth lens, a tenth lens is arranged on one side of the ninth lens, an eleventh lens is arranged on one side of the tenth lens, the third lens, the fourth lens, the fifth lens, the aperture diaphragms, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens and the eleventh lens are all positioned at the center of the inner wall of the lens shell, a second plane reflector is arranged at the top of the other side of the lens shell, and a first plane reflector is arranged at the bottom of the other side of the lens shell, and the second plane reflector and the first plane reflector are positioned on the other side of the eleventh lens, a free-form surface reflector is arranged on the other side of the lens shell, and the free-form surface reflector is positioned on one side of the second plane reflector and one side of the first plane reflector.

Furthermore, the protective sleeve is sleeved on the outer side of the lens shell, and a dustproof thin film is laid on the surface of the lens shell.

Furthermore, a mounting hole is formed in one side of the fourth lens, and the mounting hole is sleeved on the outer side of the third lens.

Further, TIR prism one end is provided with the connector, and connector one end is connected with the protection window.

Furthermore, a plurality of fixing grooves are formed in the inner wall of the lens shell, and the fixing grooves are sleeved on the outer sides of the second plane reflector, the first plane reflector and the free-form surface reflector.

Compared with the prior art, the utility model discloses the beneficial effect who reaches is:

1. the miniaturized continuous zooming laser projection objective lens has a simple structure and is convenient to operate, the external dimension of the system is greatly shortened by the optical system in a folding mode, and the miniaturization of the external dimension of the laser projector is facilitated;

2. the optical system of the miniaturized continuous zooming laser projection objective adopts a continuous zooming mode, and imaging is always kept clear when projection pictures of different sizes are projected; meanwhile, because the zoom group and the compensation group are positioned at proper positions in the transmission light path, the tolerance sensitivity of a moving part is reduced, and the optical imaging quality is easier to ensure during batch production;

3. the optical system lens of the miniaturized continuous zooming laser projection objective is small in number, only one aspheric surface is arranged in a transmission light path, and the rest aspheric surfaces are spherical surfaces, so that the production cost is greatly reduced, and the stability of imaging quality in batch production is guaranteed.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic diagram of a third lens structure of the present invention;

fig. 3 is a schematic view of the optical system 60 ″ of the present invention;

FIG. 4 is a schematic view of an optical system 80 "according to the present invention;

fig. 5 is a graph of MTF of the optical system 60 ″ of the present invention;

fig. 6 is a graph of MTF of the optical system 80 "according to the present invention;

fig. 7 is a diagram of the optical system distortion grid at optical system 60 "of the present invention;

FIG. 8 is a diagram of a distortion grid of the optical system 80 "in accordance with the present invention;

fig. 9 is a relative illuminance diagram of the optical system of the present invention;

in the figure: 1. a Digital Micromirror Device (DMD) body; 2. a protection window; 3. a TIR prism; 4. a first lens; 5. a second lens; 6. a third lens; 7. a fourth lens; 8. a fifth lens; 9. an aperture diaphragm; 10. a sixth lens; 11. a seventh lens; 12. an eighth lens; 13. a ninth lens; 14. a tenth lens; 15. an eleventh lens; 16. a second planar mirror; 17. a first planar mirror; 18. a free-form surface mirror; 19. a lens housing.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-9, the present invention provides a technical solution: a miniaturized continuous zooming laser projection objective lens comprises a digital micromirror device DMD body 1, a protective window 2, a TIR prism 3, a first lens 4, a second lens 5, a third lens 6, a fourth lens 7, a fifth lens 8, an aperture diaphragm 9, a sixth lens 10, a seventh lens 11, an eighth lens 12, a ninth lens 13, a tenth lens 14, an eleventh lens 15, a second plane reflector 16, a first plane reflector 17, a free-form surface reflector 18 and a lens shell 19, wherein the outside of the digital micromirror device DMD body 1 is provided with the lens shell 19, the outside of the lens shell 19 is sleeved with a protective sleeve, the surface of the lens shell 19 is paved with a dustproof film, the lens shell 19 is favorably protected, one end of the lens shell 19 is provided with the TIR prism 3, one end of the TIR prism 3 is sleeved with the protective window 2, and one end of the protective window 2 is connected with the digital micromirror device DMD body 1, one end of the TIR prism 3 is provided with a connector, one end of the connector is connected with the protective window 2 to be beneficial to fixing the protective window 2, the other end of the TIR prism 3 is provided with a first lens 4, the other end of the first lens 4 is provided with a second lens 5, the first lens 4 and the second lens 5 are both positioned at one side of the center inside the lens shell 19, one end of the second lens 5 is provided with a fourth lens 7, one side of the fourth lens 7 is sleeved with a third lens 6, the third lens 6 is positioned at one side of the second lens 5, one side of the fourth lens 7 is provided with a mounting hole which is sleeved outside the third lens 6 to be beneficial to fixing the third lens 6, the other end of the fourth lens 7 is provided with a fifth lens 8, one end of the fifth lens 8 is provided with a sixth lens 10, the centers of the fifth lens 8 and the sixth lens 10 are provided with an aperture diaphragm 9, one side of the sixth lens, an eighth lens 12 is arranged on one side of the seventh lens 11, a ninth lens 13 is arranged on one side of the eighth lens 12, a tenth lens 14 is arranged on one side of the ninth lens 13, an eleventh lens 15 is arranged on one side of the tenth lens 14, the third lens 6, the fourth lens 7, the fifth lens 8, the aperture stop 9, the sixth lens 10, the seventh lens 11, the eighth lens 12, the ninth lens 13, the tenth lens 14 and the eleventh lens 15 are all positioned at the center of the inner wall of the lens housing 19, a second plane reflector 16 is arranged on the top of the other side of the lens housing 19, a first plane reflector 17 is arranged on the bottom of the other side of the lens housing 19, the second plane reflector 16 and the first plane reflector 17 are positioned on the other side of the eleventh lens housing 15, a free-form surface reflector 18 is arranged on the other side of the lens housing 19, and the free-form surface reflector 18 is positioned on one side of the second plane reflector 16 and the first plane reflector 17, the inner wall of the lens shell 19 is provided with a plurality of fixing grooves which are sleeved outside the second plane reflector 16, the first plane reflector 17 and the free-form surface reflector 18, so that the second plane reflector 16, the first plane reflector 17 and the free-form surface reflector 18 are favorably fixed; when the miniaturized continuous zooming laser projection objective is used, the digital micromirror device DMD body 1 is placed in a bias mode; the third lens 6 and the fourth lens 7 form a cemented lens group, and the incident surface of the tenth lens 14 is an aspheric surface; the seventh lens 11, the eighth lens 12, the ninth lens 13 and the tenth lens 14 form a zoom group, the eleventh lens 15 is a compensation group, and the zoom group and the compensation group move according to a nonlinear curve; the first plane reflector 17, the second plane reflector 16 and the free-form surface reflector 18 form a reflector group; the light incident surface of the first lens 4 is a convex surface, the light emergent surface is a convex surface, the light incident surface of the second lens 5 is a plane, the light emergent surface is a convex surface, the light incident surface of the cemented lens group is a convex surface, the light emergent surface is a concave surface, the light incident surface of the fifth lens 8 is a convex surface, the light emergent surface is a convex surface, the light incident surface of the sixth lens 10 is a convex surface, the light emergent surface is a convex surface, the light incident surface of the seventh lens 11 is a convex surface, the light emergent surface is a convex surface, the light incident surface of the eighth lens 12 is a convex surface, the light emergent surface is a concave surface, the light incident surface of the ninth lens 13 is a convex surface, the light emergent surface is a concave surface, the light incident surface of the tenth lens 14 is a concave surface, the light emergent surface is a concave surface, the light incident; the positions of the first plane reflector 17 and the second plane reflector 16 can be optimized according to the actual situation without influencing the imaging quality; the light incident surface of the tenth lens element 14 is aspheric, and the aspheric surface is defined by the following formula:

wherein z is rise, c represents curvature at the apex of the curved surface, and r is x²+y²K is a conic coefficient, x, y represent orthogonal components of a coordinate plane perpendicular to the optical axis, a₁...a₈Representing the coefficient corresponding to the even term; the reflector adopts a free-form surface form, and the surface shape of the free-form surface is defined by the following formula:

wherein z is rise, c represents curvature at the apex of the curved surface, and r is x²+y²K is a conic coefficient, x, y represent orthogonal components of a coordinate plane perpendicular to the optical axis, C_jIs a polynomial x^myⁿThe coefficient of (a); after the light path is folded, the length from the DMD body 1 to the vertex of the free-form surface reflector is 127mm, so that the length of the light path of the projection objective is greatly shortened; when the size of the projected picture is 60' and the spatial frequency is 0.72lp, the MTF is more than 0.5; when the size of the projected picture is 80' and the spatial frequency is 0.54lp, the MTF is more than 0.6; the projection ratio is changed from 0.3 in the process of continuously changing the projection picture from 60 'to 80'0.28, the zoom group and the compensation group move according to respective nonlinear curves, and the image imaging always keeps clear, as shown in figures 3-9; as a result, the system of the present embodiment has a small number of optical lenses, a short total length, a low manufacturing cost, and excellent image quality, and can be mass-produced.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a miniaturized zoom laser projection objective in succession, includes digital micro-mirror device DMD body (1), protection window (2), TIR prism (3), first lens (4), second lens (5), third lens (6), fourth lens (7), fifth lens (8), aperture stop (9), sixth lens (10), seventh lens (11), eighth lens (12), ninth lens (13), tenth lens (14), eleventh lens (15), second plane mirror (16), first plane mirror (17), free-form surface mirror (18) and lens housing (19), its characterized in that: the digital micromirror device DMD comprises a digital micromirror device DMD body (1), wherein a lens shell (19) is arranged on the outer side of the digital micromirror device DMD body (1), a TIR prism (3) is arranged at one end of the lens shell (19), a protection window (2) is sleeved at one end of the TIR prism (3), one end of the protection window (2) is connected with the digital micromirror device DMD body (1), a first lens (4) is arranged at the other end of the TIR prism (3), a second lens (5) is arranged at the other end of the first lens (4), the first lens (4) and the second lens (5) are both positioned on one side of the inner center of the lens shell (19), a fourth lens (7) is arranged at one end of the second lens (5), a third lens (6) is sleeved at one side of the fourth lens (7), the third lens (6) is positioned on one side of the second lens (5), a fifth lens (8, a sixth lens (10) is arranged at one end of the fifth lens (8), an aperture diaphragm (9) is arranged at the center of the fifth lens (8) and the sixth lens (10), a seventh lens (11) is arranged on one side of the sixth lens (10), an eighth lens (12) is arranged on one side of the seventh lens (11), a ninth lens (13) is arranged on one side of the eighth lens (12), a tenth lens (14) is arranged on one side of the ninth lens (13), an eleventh lens (15) is arranged on one side of the tenth lens (14), and the third lens (6), the fourth lens (7), the fifth lens (8), the aperture diaphragm (9), the sixth lens (10), the seventh lens (11), the eighth lens (12), the ninth lens (13), the tenth lens (14) and the eleventh lens (15) are all located at the center of the inner wall of the lens housing (19), the lens is characterized in that a second plane reflector (16) is arranged at the top of the other side of the lens shell (19), a first plane reflector (17) is arranged at the bottom of the other side of the lens shell (19), the second plane reflector (16) and the first plane reflector (17) are located on the other side of the eleventh lens (15), a free-form surface reflector (18) is arranged on the other side of the lens shell (19), and the free-form surface reflector (18) is located on one side of the second plane reflector (16) and one side of the first plane reflector (17).

2. A compact continuous zoom laser projection objective as claimed in claim 1, characterized in that: the protective sleeve is sleeved on the outer side of the lens shell (19), and a dustproof thin film is laid on the surface of the lens shell (19).

3. A compact continuous zoom laser projection objective as claimed in claim 1, characterized in that: and a mounting hole is formed in one side of the fourth lens (7), and the mounting hole is sleeved on the outer side of the third lens (6).

4. A compact continuous zoom laser projection objective as claimed in claim 1, characterized in that: and one end of the TIR prism (3) is provided with a connector, and one end of the connector is connected with the protection window (2).

5. A compact continuous zoom laser projection objective as claimed in claim 1, characterized in that: the inner wall of the lens shell (19) is provided with a plurality of fixing grooves which are sleeved outside the second plane reflector (16), the first plane reflector (17) and the free-form surface reflector (18).