CN217639912U - Double-reflection micro-projection optical engine - Google Patents

Abstract

The embodiment of the utility model relates to a miniature projector engine field discloses a little projection optical engine of small, conveniently carry, the compact double reflection formula of overall arrangement, including light source and DMD chip and set gradually and close optical module, fly eye lens, curved light prism, speculum, relay lens, prism combination and projecting lens at the ascending collimation of the light-emitting side of light source, just the income plain noodles and the play plain noodles of curved light prism are the plane, and this application is through the light path direction of curved light prism, speculum and relay lens adjustment illumination light to light path direction through the light path design adjustment image light of DMD chip and prism combination, after making the image projection formation of image after the image light emergence, the long minor face of projection area and the long and short limit direction of projection ray apparatus keep unanimous.

Description

Double-reflection type micro-projection optical engine

Technical Field

The embodiment of the utility model provides a micro projector engine field, in particular to micro projection optical engine of double reflection formula.

Background

The projector is popular with users because the projection picture of the projector can bring a wide visual field to people. With the development of electronic technology and multimedia technology, the requirements of users on projectors are higher and higher, the projection effect of the projectors is continuously optimized, and meanwhile, the projectors are also developed towards miniaturization and light and thin, so that the projectors are convenient to carry and can enjoy the visual effect of a large screen at any time and any place.

In implementing the embodiments of the present invention, the inventor finds that there are at least the following problems in the related art: the existing projector is large in size and inconvenient to carry by a user, the long and short side directions of the existing optical engine are usually inconsistent with the long and short side directions of a projection area, and the application scene of the optical projector can be limited when the placing direction of the optical engine needs to be consistent with the direction of a target illumination area.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a small-size double-reflection type micro-projection optical engine, which can solve the problem that the directions of the long and short sides of the optical engine are inconsistent with the directions of the long and short sides of a projection area.

The embodiment of the utility model provides an aim at is realized through following technical scheme: to solve the above technical problem, an embodiment of the present invention provides a double-reflection micro-projection optical engine, including: a light source for outputting illumination light, the illumination light being transmitted in a first direction; the collimation light combination module is arranged in the light emergent direction of the light source; the compound eye lens is arranged in the light emergent direction of the collimation and light combination module, and the illumination light continues to be transmitted along the first direction after passing through the collimation and light combination module and the compound eye lens; the light source comprises a fly-eye lens, a curved prism and a light source, wherein the light source is used for providing illumination light for a fly-eye, the curved prism comprises a light inlet surface, a reflecting surface and a light outlet surface, the light inlet surface and the light outlet surface are planes, the light inlet surface is arranged in the light outlet direction of the fly-eye lens, and the curved prism is used for adjusting the direction of the illumination light for one time; the reflector is arranged in the light outgoing direction of the light outgoing surface of the curved prism and used for secondarily adjusting the direction of the illumination light and outputting the illumination light transmitted along a second direction; a relay lens disposed in a light exit direction of reflected light from the reflector; a DMD chip for receiving the illumination light and generating image light; the prism combination is used for reflecting the illumination light to the DMD chip, receiving the image light generated by the DMD chip and emitting the image light through the light emitting side; and the light inlet side of the projection lens is arranged in the light outlet direction of the prism combination and is used for adjusting and then emitting the image light.

In some embodiments, the first direction and the second direction are opposite directions.

In some embodiments, the reflective surface of the curved prism is plated with a high-reflection film.

In some embodiments, the illumination light is incident into the curved prism through the light incident surface of the curved prism, and the incident angle when reaching the reflecting surface of the curved prism is larger than the total reflection critical angle of the curved prism.

In some embodiments, the prism combination comprises: the first prism comprises a first surface, a second surface and a third surface, and the illumination light enters the first prism through the first surface, reaches the third surface after being totally reflected through the second surface and is reflected to the second surface to be transmitted and emitted; the second prism comprises a fourth surface, a fifth surface and a sixth surface, wherein the fourth surface and the sixth surface are attached into a whole, the fifth surface is close to the DMD chip, the illumination light is transmitted through the fourth surface and is incident into the second prism, the fifth surface is irradiated onto the DMD chip after being emitted, and the image light generated by the DMD chip is incident into the second prism through the fifth surface and is totally reflected through the fourth surface to be emitted through the sixth surface.

In some embodiments, the first face, the fifth face, and the sixth face are plated with a highly permeable film; the second surface and the fourth surface are plated with a semi-reflecting and semi-permeable membrane; and a high-reflection film is plated on the third surface.

In some embodiments, the second prism is an isosceles right angle prism.

In some embodiments, the angle α between the first face and the second face of the first prism ranges from 45 ° ± 20 °.

In some embodiments, the third face of the first prism is spherical, aspherical, or free-form.

In some embodiments, the mirror is a non-planar mirror.

Compared with the prior art, the beneficial effects of the utility model are that: be different from the condition of prior art, the embodiment of the utility model provides a little projection optical engine of small, conveniently carry, the compact double reflection of overall arrangement, including light source and DMD chip and set gradually and close optical module, fly eye lens, bent light prism, speculum, relay lens, prism combination and projecting lens in the collimation of the light-emitting direction of light source, just the income plain noodles and the play plain noodles of bent light prism are the plane, and this application passes through the light path direction of bent light prism, speculum and relay lens adjustment illumination light to the light path direction of image light is adjusted in the light path design through DMD chip and prism combination, makes after the image projection imaging after the image light emergence, the long minor face of projection region and the long and short side direction of projection ray apparatus keep unanimously.

Drawings

The embodiments are illustrated by the figures of the accompanying drawings which correspond and are not meant to limit the embodiments, in which elements/blocks having the same reference number designation may be represented by like elements/blocks, and in which the drawings are not to scale unless otherwise specified.

Fig. 1 is a schematic structural diagram of a double-reflection micro-projection optical engine according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the structure and optical path of the DMD chip and prism combination of FIG. 1;

fig. 3 is a diagram illustrating a projection effect of a double-reflection micro-projection optical engine according to an embodiment of the present invention.

In the figure: 10. a light source; 20. a collimation light-combining module; 30. a fly-eye lens; 40. a curved prism; 41. a light incident surface of the curved prism; 42. a reflecting surface of the curved prism; 43. a light-emitting surface of the curved prism; 50. a mirror; 60. a relay lens; 70. a DMD chip; 80. combining prisms; 81. a first prism; 82. a second prism; 90. a projection lens; s1, a first surface; s2, a second surface; s3, a third surface; s4, the fourth surface; s5, a fifth surface; s6, a sixth surface.

Detailed Description

The present invention will be described in detail with reference to the following embodiments. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that numerous variations and modifications could be made by those skilled in the art without departing from the spirit of the invention. All of which belong to the protection scope of the present invention.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It should be noted that, if not conflicted, the various features of the embodiments of the invention can be combined with each other and are within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, they may be divided differently from the blocks in the device. Further, the words "first", "second", "third", "fourth", "fifth", and the like, as used herein do not limit the data and the order of execution, but merely distinguish between the same or similar items that have substantially the same function and effect. The terms "left", "right" and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Specifically, the embodiments of the present invention will be further explained with reference to the drawings.

The embodiment of the present invention provides a double-reflection type micro-projection optical engine, please refer to fig. 1 and fig. 2, wherein fig. 1 shows a structure of a double-reflection type micro-projection optical engine provided by the embodiment of the present invention, fig. 2 shows a structure and a light path of a DMD chip and a prism combination in fig. 1, the double-reflection type micro-projection optical engine includes: the light source 10, the collimation and light combination module 20, the fly-eye lens 30, the curved light prism 40, the reflector 50, the relay lens 60, the DMD chip 70, the prism combination 80 and the projection lens 90.

The light source 10 is used for outputting illumination light, and the illumination light is transmitted along a first direction; the Light source 10 may be a laser Light source, or a Light-emitting Diode (LED) Light source, and may be specifically selected according to actual needs. In the example shown in fig. 1, the first direction is a right-to-left direction, and the second direction is a left-to-right direction.

The collimation and light combination module 20 is arranged in the light outgoing direction of the light source 10; the collimating and light-combining module 20 is configured to collimate light, and combine light of three primary colors R, G, and B output from the light source 10 and then emit the combined light, and specifically, the structure of the collimating and light-combining module 20 may be designed according to actual needs, and is not limited to the example shown in fig. 1.

The fly-eye lens 30 is arranged in the light-emitting direction of the collimating and light-combining module 20, and the illumination light continues to be transmitted along the first direction after passing through the collimating and light-combining module and the fly-eye lens; preferably, the fly eye lens 30 is a fly eye dodging lens, and the fly eye lens 30 dodges and emits the illumination light.

The prism 40 includes a light incident surface 41, a reflection surface 42, and a light exit surface 43, the light incident surface 41 is disposed in the light exit direction of the reflected light of the fly-eye lens 30, and the prism 40 is configured to adjust the direction of the illumination light once. Specifically, the light incident surface 41 and the light exiting surface 43 of the curved prism 40 are planes. The Reflection surface 42 of the curved prism 40 is plated with a high Reflection film, or the illumination light is incident into the curved prism 40 through the light incident surface 41 of the curved prism 40, and the incident angle when reaching the Reflection surface 42 of the curved prism 40 is larger than the Total Internal Reflection (TIR) critical angle of the curved prism 40. The embodiment of the utility model provides an adopt the folding and the direction adjustment of light beam are realized to bent light prism 40, can effectively save the cost, also be convenient for installation and fixed, have effectively reduced installation tolerance.

The reflector 50 is arranged in the light outgoing direction of the light outgoing surface of the curved prism 40, and is used for adjusting the direction of the illumination light for the second time and outputting the illumination light transmitted along the second direction; wherein the first direction and the second direction are opposite directions. The speculum 50 can be the level crossing, perhaps, also can be non-level crossing, specifically, about whether speculum 50 is the level crossing and for the setting of structures such as camber when non-level crossing, can design according to actual need, need not be restricted to the utility model discloses the injeciton.

The relay lens 60 is arranged in the light outgoing direction of the reflected light of the reflector 50; specifically, the specific structure of the relay lens 60, such as the number, model, material, etc. of the lenses, can be designed according to actual needs, and need not be restricted to the embodiment of the present invention shown in fig. 1.

The DMD chip 70 for receiving illumination light and generating image light; the DMD (Digital micro mirror Device) chip 70 is a core of a Digital Light Processing (DLP), and is capable of receiving illumination Light and adjusting a switching frequency to generate image Light for projection imaging.

The light incident side of the prism assembly 80 is disposed in the light emergent direction of the relay lens 60, the light reflecting side of the prism assembly 80 is disposed in the light emergent direction of the DMD chip 70, and the prism assembly 80 is configured to reflect the illumination light to the DMD chip 70, receive the image light generated by the DMD chip 70, and emit the image light through the light emergent side.

Specifically, the prism assembly 80 includes: the first prism 81 and the second prism 82. The first prism 81 includes a first surface S1, a second surface S2, and a third surface S3, and the illumination light is incident into the first prism 81 through the first surface S1, totally reflected by the second surface S2, reaches the third surface S3, is reflected to the second surface S2, and is transmitted and emitted; the third surface S3 can adjust the angle of the illumination light, so that the incident angle of the illumination light reaching the second surface S2 is smaller than the total reflection angle, and the illumination light is transmitted and emitted, and the light can be incident on the DMD chip 70 at a correct angle by adjusting the angle β between the second surface S2 and the third surface S3; preferably, an angle α between the first surface S1 and the second surface S2 of the first prism 81 is in a range of 45 ° ± 20 °, and the third surface S3 of the first prism 81 is a spherical surface, an aspherical surface, or a free-form surface; preferably, the first surface S1 is plated with a high-transparency film, the second surface S2 is plated with a semi-reflective and semi-transparent film, the third surface S3 is plated with a high-reflectivity film, and the film may be a metal film or a dielectric film.

The second prism 82 includes a fourth surface S4, a fifth surface S5 and a sixth surface S6, the fourth surface S4 and the second surface S2 are bonded together, the fifth surface S5 is disposed near the DMD chip 70, the illumination light is transmitted through the fourth surface S4 to enter the second prism 82, and is emitted through the fifth surface S5 to be irradiated onto the DMD chip 70, and the image light generated by the DMD chip 70 is incident through the fifth surface S5 to the second prism 82, and is totally reflected through the fourth surface S4 to be emitted through the sixth surface S6; preferably, the fourth surface S4 is plated with a transflective film, the fifth surface S5 and the sixth surface S6 are plated with a highly transparent film, and the film may be a metal film or a dielectric film; further, the second prism 82 may be an isosceles right-angle prism.

The light incident side of the projection lens 90 is disposed in the light emergent direction of the prism assembly 80, and is used for adjusting and emitting the image light. Specifically, the projection lens 90 is disposed near the sixth surface S6, and is used for adjusting light to a proper size, and/or for adjusting distortion of image light, and/or may also be used for adjusting a focal length of an image, and the like. The specific structure of projection lens 90, if lens quantity, model, material etc. that set up, can be according to actually right projection lens 90's function needs design, need not be restricted the embodiment of the utility model discloses the example in figure 1.

Referring to fig. 3, it shows a projection effect diagram of a double-reflection micro-projection optical engine 100 according to an embodiment of the present invention, as shown in fig. 3, an embodiment of the present invention provides a compact layout, small size, and portable digital light processing DLP double-reflection micro-projection optical engine system; and when the placing direction of the projection optical engine is required to be consistent with the direction of the target illumination area a, the embodiment of the present invention provides a double-reflection micro-projection optical engine, wherein the long side L of the double-reflection micro-projection optical engine corresponds to the field side L 'of the target illumination area, and the short side S of the same double-reflection micro-projection optical engine corresponds to the short side S' of the illumination area.

The embodiment of the utility model provides a little projection optical engine of small, conveniently carry, the compact double reflection formula of overall arrangement, including light source and DMD chip and set gradually and close optical module, fly eye lens, bent light prism, speculum, relay lens, prism combination and projecting lens at the ascending collimation of the light-emitting direction of light source, just the income plain noodles and the play plain noodles of bent light prism are the plane, and this application passes through the light path direction of bent light prism, speculum and relay lens adjustment illumination light to light path direction through the light path design adjustment image light of DMD chip and prism combination, make after the image projection formation of image after the image light emergence, the long minor face of projection area and the long and short limit direction of projection ray apparatus keep unanimous.

It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.

Claims (9)

1. A dual reflective micro-projection optical engine, comprising:

a light source for outputting illumination light, the illumination light being transmitted in a first direction;

the collimation light combination module is arranged in the light emergent direction of the light source;

the compound eye lens is arranged in the light emergent direction of the collimation and light combination module, and the illumination light continues to be transmitted along the first direction after passing through the collimation and light combination module and the compound eye lens;

the curved light prism comprises a light incident surface, a reflecting surface and a light emergent surface, the light incident surface and the light emergent surface are planes, the light incident surface is arranged in the light emergent direction of the fly eye lens, and the curved light prism is used for adjusting the direction of the illuminating light for one time;

the reflecting mirror is arranged in the light outgoing direction of the light outgoing surface of the curved prism and used for secondarily adjusting the direction of the illuminating light and outputting the illuminating light transmitted along the second direction, and the reflecting mirror is a non-plane mirror;

the relay lens is arranged in the light outgoing direction of the reflected light of the reflector;

a DMD chip for receiving the illumination light and generating image light;

the prism combination is used for reflecting the illumination light to the DMD chip, receiving the image light generated by the DMD chip and emitting the image light through the light emitting side;

and the light inlet side of the projection lens is arranged in the light outlet direction of the prism combination and is used for adjusting and then emitting the image light.

2. The dual reflective micro projection optical engine of claim 1,

the first direction and the second direction are opposite directions.

3. The dual reflective micro projection optical engine of claim 2,

and the reflecting surface of the curved prism is plated with a high-reflection film.

4. The dual reflective micro projection optical engine of claim 2,

the illumination light is incident into the curved prism through the light incident surface of the curved prism, and the incident angle when reaching the reflecting surface of the curved prism is larger than the total reflection critical angle of the curved prism.

5. A dual reflective micro projection optical engine according to any of claims 1-4, wherein said prism assembly comprises:

the first prism comprises a first surface, a second surface and a third surface, and the illumination light is incident into the first prism through the first surface, reaches the third surface after being totally reflected through the second surface, is reflected to the second surface and is transmitted and emitted;

the second prism, including fourth face, fifth face and sixth face, the fourth face with the laminating of second face is as an organic whole, the fifth face is close to the DMD chip sets up, the illumination light passes through the fourth face transmission incides in the second prism, and pass through shine behind the fifth face outgoing on the DMD chip, the image light that the DMD chip produced passes through the fifth face incides in the second prism, and pass through the fourth face total reflection arrives the sixth transmission outgoing.

6. The dual reflective micro projection optical engine of claim 5,

the first surface, the fifth surface and the sixth surface are plated with high-permeability films;

the second surface and the fourth surface are plated with a semi-reflecting and semi-permeable membrane;

and a high-reflection film is plated on the third surface.

7. The dual reflective micro projection optical engine of claim 5,

the second prism is an isosceles right-angle prism.

8. The dual reflective micro projection optical engine of claim 5,

the angle α between the first face and the second face of the first prism is in the range of 45 ° ± 20 °.

9. The dual reflective micro projection optical engine of claim 5,

and the third surface of the first prism is a spherical surface, an aspheric surface or a free-form surface.

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