CN112073699A

CN112073699A - Projection system and projection method thereof

Info

Publication number: CN112073699A
Application number: CN201910498840.8A
Authority: CN
Inventors: 郎海涛; 张鹤腾; 杨佳; 桑鹏鹏
Original assignee: Ningbo Sunny Automotive Optech Co Ltd
Current assignee: Ningbo Sunny Automotive Optech Co Ltd
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-12-11
Anticipated expiration: 2039-06-11
Also published as: CN112073699B

Abstract

The invention provides a projection system and a projection method thereof, wherein the projection system comprises a light source module, an image source module and a projection module, wherein the light source module emits light beams, the image source module is arranged on the emergent side of the light source module, the image source module provides image information, the light beams emitted from the image source module carry the image information, the light beams with at least two energy levels are emitted from the image source module, the projection module is arranged on the emergent side of the image source module, the projection module projects the light beams emitted from the image source module to an image surface for imaging on the image surface, and the light beams projected by the projection module form images on the image surface along at least two light paths.

Description

Projection system and projection method thereof

Technical Field

The invention relates to the field of optics, in particular to a projection system and a projection method thereof.

Background

With the development of the automobile lighting technology, the auxiliary lamp is not only limited to meet the requirement of light supplement, but also can be used for displaying the information of the automobile brand, and different marks can be projected at corresponding distances in the front of the automobile so as to achieve the purpose of human-vehicle interaction. Projection systems are used to assist vehicle lights to project information in front of the vehicle.

In a traditional vertical static projection system, a film is used as an image source, a single LED is used as a light source, the image surface illumination distribution is uniform, and no obvious light and shade difference exists in the sense of human eyes. However, the front projection is an oblique projection, and the distance between projected images is relatively long, so that the illumination of each pattern in the long-distance projection is greatly changed, that is, the human eyes can see a remarkable light and shade difference. Meanwhile, because the magnification of the lens is fixed, in the actual projection, if the size of the image surface light spot is required to be consistent, the pattern on the corresponding film needs to be reduced to a certain degree. The reduced pattern results in a further reduction in the amount of light transmitted, resulting in a lower illumination of the long-range projected pattern compared to the short-range pattern. Therefore, a single light source cannot meet the requirement that the image surface illumination of a plurality of projection patterns is uniform under different projection distances.

Referring to fig. 1, a projection system of the prior art includes a light source module 10P, a film 20P and a projection module 30P, the film 20P is disposed on the light source module 10P and the exit side, and the projection module 30P is disposed on the exit side of the film 20P. The light source module 10P only includes one light source 101P, the light beam that light source 101P throws passes film 20P with image at the image plane behind the projection module 30P, because only one light source 101P, the light beam energy that light source 101P throws is single for on the image plane, the illuminance of far away's formation of image is lower, and the illuminance of near distance's formation of image is stronger, and the formation of image illuminance of different distances is inhomogeneous, is unfavorable for the people's eye to obtain information. Because the near imaging illumination intensity is strong, the information acquisition is simpler, and people may choose to acquire information from the near imaging, but if human eyes concentrate on observing the near imaging, the observation on the far is reduced, and danger is generated. And the far imaging illumination is weak, so that the information is difficult to acquire when the human eyes observe the far position.

That is to say, if the projected light spots are consistent when different distances are kept, and the light flux amount is different due to different sizes of patterns of the film, the imaging illumination intensity is different, and the imaging illumination intensity at a distance is weaker, which is not beneficial to acquiring information. If the imaging illumination is kept consistent, and the light passing amount of the film is consistent, the pattern size of the film is the same, so that the projected light spots are inconsistent in size, and therefore contradictions can be generated between the light spot size and the uniform illumination.

Disclosure of Invention

An advantage of the present invention is to provide a projection system and a projection method thereof, in which images projected on image planes at different distances maintain uniform illumination.

Another advantage of the present invention is to provide a projection system and a projection method thereof, wherein the energy of the light beams projected by each light source is set according to different distances, so that the illuminance of the image planes at different distances is uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof, wherein the power of the light beams projected by each light source can be adjusted to make the illuminance of the image plane uniform at different distances.

Another advantage of the present invention is to provide a projection system and a projection method thereof, in which the projected light beam is divided into a plurality of light beams with different energies for projection, so that the illumination of the image planes at different distances is uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which can reflect light beams with different energies by different reflection capabilities, so as to make the illumination of the image planes at different distances uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which split a light beam projected by at least one light source to generate light beams projected by at least two light paths with different energies, without increasing the light emitting power and maintaining the use cost.

Another advantage of the present invention is to provide a projection system and a projection method thereof, in which the projected light beams have different energies, so that the illumination intensities of the images at different positions of the image plane are uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof, in which the number of the light sources can be adjusted to meet different projection requirements.

Another advantage of the present invention is to provide a projection system and a projection method thereof, in which the number of light paths into which the light source is split can be adjusted according to the projection distance and the pattern.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which has a simple structure and a light weight.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which are easy to assemble and easy to maintain.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which can ensure the quality of images projected to a longer distance, facilitate the acquisition of information and the observation of the environment at a longer distance, and facilitate the security assurance.

It is another advantage of the present invention to provide a projection system and method for projecting images that can be viewed both near and far to obtain more information.

Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.

In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved in a projection system, comprising:

the light source module emits light beams;

the image source module is arranged at the emergent side of the light source module, the image source module provides image information, light beams emitted by the image source module carry the image information, and light beams with at least two energy levels are emitted from the image source module; and

the projection module is arranged on the emergent side of the image source module, projects the light beam emitted by the image source module to an image surface and forms an image on the image surface, wherein the light beam projected by the projection module forms an image on the image surface along at least two optical paths.

According to an embodiment of the present invention, the light source module includes at least two light sources, each of the light sources respectively emits a light beam, wherein the light beam projected by each of the light sources respectively has the optical path, and the light beam projected by each of the light sources reaches the image plane according to the optical path.

According to an embodiment of the present invention, the light source module further includes at least two collimating lenses, each of the collimating lenses is disposed at an emitting side of each of the light sources, and the collimating lenses collimate the light beams emitted from the light sources.

According to an embodiment of the present invention, the light source module further includes a collimating lens, and the collimating lens is disposed on the emitting side of the light sources, and collimates the light beams emitted from the light sources.

According to an embodiment of the present invention, the light beams projected by the light source module enter from one side of the image source module along each of the light paths, exit from the other side of the image source module, enter from one side of the projection module along each of the light paths, and exit from the other side of the projection module, and the light beams projected by the projection module are projected to the image plane along each of the light paths, wherein the light beams with stronger energy are projected to a position farther from the image plane, and the light beams with weaker energy are projected to a position closer to the image plane, so that the illuminance of the image on the image plane is uniform.

According to an embodiment of the present invention, the light source module includes at least one light source and at least one collimating lens, the collimating lens is disposed on an exit side of the light source, and the collimating lens collimates a light beam emitted from the light source.

According to an embodiment of the present invention, the projection system further includes a light splitting module, the light splitting module is disposed on an emitting side of the light source module, and a light beam emitted from the light source module enters from one side of the light splitting module and exits from the other side of the light splitting module.

According to an embodiment of the present invention, the light splitting module includes at least two light splitting elements, each of the light splitting elements is sequentially disposed on the emitting side of the light source module, and a light beam emitted by the light source module sequentially passes through each of the light splitting elements and is split by the light splitting elements to form at least two light paths.

According to an embodiment of the present invention, a surface of the light splitting element is provided with a film layer having different reflectivity, and the light beam projected by the light source is reflected by the light splitting element to form at least two light paths, wherein the light beams of the light paths have different energies.

According to an embodiment of the present invention, the light splitting element includes at least a first light splitting element and a second light splitting element, the first light splitting element is a half-mirror, the second light splitting element is a plane mirror, wherein the light beam emitted from the light source module enters from one side of the first light splitting element, a part of the light beam is reflected by the first light splitting element, another part of the light beam passes through the first light splitting element, enters from one side of the second light splitting element, and is reflected by the second light splitting element, and the light beam emitted from the light source module is split by the first light splitting element and the second light splitting element.

According to an embodiment of the present invention, the light beam reflected by the light splitting element closer to the light source module has stronger energy, and reaches the image plane to be imaged after passing through the image source module and the projection module in sequence along the longer light path, and the light beam reflected by the light splitting element farther from the light source module has weaker energy, and reaches the image plane to be imaged after passing through the image source module and the projection module in sequence along the shorter light path, so that the imaging illumination intensity of the image plane is uniform.

According to one embodiment of the present invention, the image source module includes at least two image source regions, each of the image source regions carrying image information, wherein the transmittance of the light beam of each of the image source regions is set so that each of the image source regions emits a light beam having at least two energy levels.

According to an embodiment of the present invention, when the light path passing through the image source region is long, the energy of the light beam emitted from the image source region is strong, and when the light path passing through the image source region is short, the energy of the light beam emitted from the image source region is weak.

According to another aspect of the present invention, the present invention further provides a projection method, comprising the steps of:

(A) projecting a light beam having at least two energy levels propagating along at least two optical paths; and

(B) each light path is imaged at a corresponding distance position of an image plane.

According to one embodiment of the present invention, the step (a) further comprises the steps of:

emitting light beams through at least two light sources; and

and adjusting the energy of the light beams projected by each light source, wherein the light beams with longer light paths have stronger energy, and the light beams with shorter light paths have weaker energy.

and collimating the light beam emitted by the light source by at least one collimating lens.

emitting a light beam through at least one light source; and

and collimating the light beam emitted by the light source.

distributing the light beam emitted by the light source through at least a light splitting element; and

forming light beams with different energies propagating along at least two optical paths.

setting the light beam transmittance of at least two image source areas of an image source module; and

a light beam having at least two energy levels is emitted from each of the image source regions.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

FIG. 1 is a schematic diagram of a prior art projection light path.

FIG. 2A is a schematic diagram of a projection optical path of a projection system according to a preferred embodiment of the present invention.

Fig. 2B is an enlarged schematic view of the region a in fig. 2A.

Fig. 3A is a schematic view of a projection system according to a variation of the above preferred embodiment of the present invention.

Fig. 3B is an enlarged schematic view of the region B in fig. 3A.

FIG. 4A is a schematic view of a projection system according to another preferred embodiment of the invention.

Fig. 4B is an enlarged schematic view of the region C in fig. 4A.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to fig. 2A and 2B, a projection system includes at least one light source module 10, at least one image source module 20, and at least one projection module 30, wherein the light source module 10 projects a light beam, the image source module 20 is disposed at an exit of the light source module 10, and the light source module 10 provides the light beam for the image source module 20. The projection module 30 is disposed at the exit of the image source module 20. The image source module 20 is held at the entrance of the projection module 30. The light beam projected by the light source module 10 is incident from one side of the image source module 20, and the image source module 20 carries image information. When the light beam exits from the other side of the image source module 20, the light beam carries the image information provided by the image source module 20 and enters from one side of the projection module 30. The projection module 30 projects the light beam carrying the image information to an image plane.

The light source module 10 includes at least two light sources 101, and each light source 101 projects a light beam to form a light path 1000. The light source module 10 emits a light beam having at least two energy levels. The energy emitted from each of the light sources 101 is different.

The light beam projected by the light source 101 enters from one side of the image source module 20 and exits from the other side of the image source module 20. The light beam emitted from the other side of the image source module 20 carries the image information of the image source module 20. The light path 1000 formed by the light beam projected by the light source 101 reaches the image source module 20 from the light source module 10, and exits from the other side of the image source module 20.

In an example of the present invention, the light source module 10 further includes at least two collimating lenses 102, and each of the collimating lenses 102 is disposed on an emitting side of each of the light sources 101. That is, each of the collimating lenses 102 corresponds to each of the light sources 101. The collimating lens 102 collimates the light beam emitted from the light source 101. The light beam emitted from the light source 101 enters from one side of the collimating lens 102, is collimated by the collimating lens 102, and then exits from the other side of the collimating lens 102. The light beam projected by the light source module 10 is collimated. The light beam projected by the light source module 10 enters from one side of the image source module 20 and exits from the other side of the image source module 20.

In another example of the present invention, referring to fig. 3A and 3B, the light source module 10 further includes a collimating lens 102A, and the collimating lens 102A is disposed at an emitting side of each of the light sources 101. The light beams projected by the light sources 101 enter one side of the collimator lens 102A and exit the other side of the collimator lens 102A. The light beam projected by the light source 101 is collimated by the collimator lens 102A. The collimator lens 102A is implemented as a free-form surface collimator lens.

The light beam emitted from the light source module 10 is collimated, and the collimated light beam enters from one side of the image source module 20 and exits from the other side of the image source module 20.

With reference to fig. 2A to 3B, after the light beam exits from the image source module 20, the light beam enters from one side of the projection module 30 and exits from the other side of the projection module 30 to the image plane. The projection module 30 projects the light beam to the image plane, and images on the image plane, where the image information carried by the light beam is presented. The optical path 1000 reaches the projection module 30 from the image source module 20, and exits from one side of the projection module 30 to the image plane.

The image source module 20 provides image information. The image source module 20 is provided with at least two image source regions 200. Each of the image source regions 200 provides image information. Wherein the image information of each of the image source regions 200 presents patterns with different sizes. The image information of each of the image source regions 200 is projected to different positions of the image plane. The pattern of the image source region 200 projected to a position farther from the image plane is smallest, and the pattern of the image source region 200 projected to a position closer to the image plane is largest.

According to the difference of the projection distance, the patterns of the image source regions 200 are different in size, the patterns of the image source regions 200 with longer projection distance are smaller and are projected to the position with farther image surface, and the patterns of the image source regions 200 with shorter projection distance are smaller and are projected to the position with closer image surface, so that the sizes of the light spots of the patterns imaged on the image surface are consistent.

The light beams projected by the light sources 101 have the respective light paths 1000. When the projection system projects obliquely relative to the image plane, an included angle is formed between each light path 1000 and the image plane. The light beam projected by the light source 101 reaches the image plane along the light path 1000. When the light beams projected by the light sources 101 are imaged on the image plane, the distance between the image and the projection system is different. The optical paths 1000 are different in length. The light source 101 with the longer light path 1000 projects to a position with a longer distance from the image surface, the requirement on the illumination is high, the light source 101 with the shorter light path 1000 projects to a position with a shorter distance from the image surface, and the illumination of the image is similar to that of the image with the longer distance.

When the energy of the light beams of each of the light paths 1000 is the same, the light beams reach different positions of the image plane through different distances, so that the imaging quality is different, and the illumination is not uniform. The farther away the distance, the less the illumination. Therefore, the energy of the light beams projected by each light source 101 is controlled to make the illuminance of the image formed at different positions uniform when reaching the image plane. When the light path 1000 of the light beam projected by the light source 101 is long, the energy of the light projected by the light source 101 is strengthened, and when the light path 1000 of the light beam projected by the light source 101 is short, the energy of the light projected by the light source 101 is smaller than the energy of the light source with the long light path 1000, so that the illuminance of the longer-distance image and the illuminance of the shorter-distance image are uniform on the image plane.

That is, the projection distances between the light sources 101 and the image plane are different, and the longer the projection distance is, the stronger the energy of the projected light beam needs to be. Therefore, the luminous flux projected by each light source 101 is adjusted according to the projection distance, so that the illuminance after imaging at different projection distances is uniform.

The image information provided by the image source module 20 does not need to be adjusted, and only the light beam projected by the light source module 10 is adjusted, so that an image with uniform illumination can be formed on the image plane in an oblique projection state.

The illumination of images projected to different distances by the projection system is uniform, so that the information of near imaging and far imaging can be acquired, and the acquired information amount is large. Both far imaging and near imaging can be observed, and the method is also favorable for selecting an imaging position suitable for observation according to actual conditions, and is favorable for ensuring safety.

In an example of the present invention, the energy of the light projected by each of the light sources 10 is adjusted according to the distance from each of the light sources 10 to the optical path 1000 of the image plane, so that the illumination of the image is uniform when the light beam along each of the optical paths 1000 reaches different positions of the image plane. The projection of the projection system on the image plane has the same or similar effect at different positions, so that the human eyes can observe conveniently and image information can be acquired.

In another example of the present invention, the projection system further includes an adjusting module, which is connected to the light source module 10 to adjust the energy of the light projected by each of the light sources 101 of the light source module 10. The adjusting module adjusts the energy of light according to the size of the light path 1000 projected to the image plane by each light source 101. The adjusting module can also adjust the power of each light source 101, so that each light source 101 projects a light beam with different energy.

It is noted that the image source module 20 is implemented as a film, and can also be implemented as being made of other light-transmitting materials. The light source 101 may be implemented as an LED light source or a laser light source. The power of the light source 101 may be adjusted to emit light beams of different energies. The number of the light sources 101 may be set according to the projection distance and the image information provided by the image source module 20, so that the imaging illumination is uniform under different projection distances and different image information.

In another example of the present invention, the transmittance of the image source module 20 is adjusted, so that the energy of the light beam emitted from the image source module 20 is adjusted. Specifically, the light beam transmittance of each of the image source regions 200 of the image source module 20 may be set so that each of the image source regions 200 emits light beams with different energies.

Light beams enter from one side of the image source module 20 and exit from the other side of the image source module 20, and the light beams enter from one side of each of the image source regions 200 and exit from the other side of each of the image source regions 200 respectively. The energy of the light beam emitted from one side of each of the image source regions 200 can be adjusted by the transmittance of the image source regions 200 to meet the projection requirements of different distances.

When the transmittance of the image source region 200 is high, the energy of the light beam emitted from the image source region 200 is strong, and the light beam is projected to a far position of the image plane, and when the transmittance of the image source region 200 is low, the energy of the light beam emitted from the image source region 200 is weak, and the light beam is projected to a near position of the image plane, so that the illuminance of the images at different positions of the image plane is uniform. The intensity of the energy of the light beam emitted from the image source module 20 to the projection module 30 for projection can be adjusted by adjusting the energy of the light beam emitted from the light source 101, so that the illuminance of the image on the image plane is uniform. By designing or adjusting the transmittance of the light beam in each image source region 200 of the image source module 20, the energy intensity of the light beam emitted from the image source module 20 to the projection module 30 for projection can be adjusted, so that the illuminance of the images at different positions of the image plane is uniform. The energy adjustment of the light beam emitted from the image source module 20 to the projection module 30 for projection is realized by adjusting the energy of the light beam emitted from the light source 101 and the transmittance of the image source 200, so that the image source module 20 emits light beams with different energies and propagating along at least two optical paths 1000 for projection.

That is, the transmittance of each of the image source regions 200 is set to adjust the energy intensity of the light beam emitted from each of the image source regions 200. When the light path passing through the image source region 200 is long, the energy of the light beam emitted from the image source region 200 is strong, and when the light path passing through the image source region 200 is short, the energy of the light beam emitted from the image source region 200 is relatively weak.

In another preferred embodiment of the present invention, referring to fig. 4A and 4B, the projection system includes a light source module 10A, an image source module 20A, a projection module 30A and a light splitting module 40A, wherein the light source module 10A projects light beams. The spectral module 40A is provided on the emission side of the light source module 10A. The light beam enters from one side of the light splitting module 40A and exits from the other side of the light splitting module 40A.

The image source module 20A is disposed on the exit side of the light splitting module 40A, and the image source module 20A carries image information. The light beam emitted from the light splitting module 40A enters from one side of the image source module 20A and exits from the other side of the image source module 20A. The light beam emitted from the image source module 20A carries the image information provided by the image source module 20A. The projection module 30A is disposed on the exit side of the image source module 20A. The light beam carrying the image information enters from one side of the projection module 30A, exits from the other side of the projection module 30A to an image plane, and forms an image on the image plane to display the image information provided by the image source module 20A.

The light splitting module 40A distributes energy of the light beam projected by the light source module 10A. The light source module 10A includes at least one light source 101A, and the light source 101A projects a light beam to the image plane according to a light path 1000 for imaging. The light source module 10A further includes at least one collimating lens 102B, and the collimating lens 102B is disposed on the exit side of the light source 101A. The light beam emitted from the light source 101A enters from one side of the collimating lens 102B, is collimated by the collimating lens 102B, and is emitted from the other side of the collimating lens 102B. The light beam projected by the collimating lens 102B enters from one side of the light splitting module 40A.

The spectral module 40A includes at least two spectral elements 400A, and each of the spectral elements 400A is disposed on the emission side of the light source module 10A. The light splitting elements 400A are sequentially disposed at intervals on the emission side of the light source module 10A. Each of the light splitting elements 400A is preferably oriented at the same angle to the light source module 10A. The light beam emitted from the light source module 10A enters the light splitting element 400A closest to the light source module 10A.

The surface of each of the light splitting elements 400A is provided with a film layer having different reflectivity. When a light beam enters from a side of the light splitting element 400A closest to the light source module 10A, a part of the light beam is reflected by the film layer of the light splitting element 400A to exit from the light splitting module 40A, forming a light path 1000A.

Preferably, the light splitting element 400A disposed from the light source module 10A side is a half-transparent mirror, a part of the light beam is reflected, and the remaining part of the light beam is projected to the next light splitting element 400A through the light splitting element 400A. The outermost beam splitter 400A is a mirror, and reflects all the light beams.

That is, the light beam projected by the light source is partially reflected by the light splitting element 400A located at the front, and then totally reflected by the light splitting element 400A located at the last.

The light beam not reflected by the light splitting element 400A closest to the light source module 10A passes through the light splitting element 400A and is projected to the next light splitting element 400A, and the light splitting element 400A reflects part of the light beam to exit from the light splitting module 40A to form another light path 1000A.

The remaining light beam not reflected by the light splitting element 400A continues to be projected to the next light splitting element 400A and reflected by the light splitting element 400A to exit from the light splitting module 40A to form another light path 1000A until the light beam is reflected by the last light splitting element 400A. The light beams reflected by the respective light splitting elements 400A form the respective light paths 1000A.

Since the reflectance of the film layer of each of the spectroscopic elements 400A is different, the energy of the light beam emitted from each of the spectroscopic elements 400A is also different. The light beams emitted from the light splitting elements 400A continuously enter from one side of the image source module 20A and exit from the other side of the image source module 20A. The light beam emitted from the image source module 20A carries image information, enters from one side of the projection module 30A, and emits from the other side of the projection module 30A to the image plane, and forms an image on the image plane to display the image information provided by the image source module 20A.

The light beam projected by the light source module 10A is split by the light splitting element 400A to form a plurality of light paths 1000A, and the light energy of each light path 1000A is different. The light path 1000A extends to the image plane where the light beam is imaged. In each of the light paths 1000A, the light of the light path 1000A having the image plane at a longer distance from the light splitting element 400A has a stronger energy, and when the light is projected to a position having the image plane at a longer distance, the imaging quality is also ensured, the light of the light path 1000A having the image plane at a shorter distance from the light splitting element 400A has a weaker energy, and the illuminance of the image projected to a position having the image plane at a shorter distance is the same as the illuminance of the image at a longer distance. That is, after the light is split by the light splitting element 400A, the illuminance of the image projected out of the image plane is uniform at different distances, so that the overall imaging quality is good, and the observation by human eyes is facilitated.

The reflectivity of each of the light splitting elements 400A is designed and adjusted according to actual requirements. The reflectivity of the film layer on the surface of each light splitting element 400A is designed and adjusted according to actual projection requirements, such as projection distance, projection pattern requirements, and the like. The reflectivity of the film layer on the surface of the light splitting element 400A closer to the light source 10A is higher to reflect a stronger light beam, and meanwhile, the film layer on the surface of the light splitting element 400A closer to the light source 10A needs to ensure a certain transmittance, so that part of the light beam can reach the next light splitting element 400A through the light splitting element 400A to be split by the next light splitting element 400A. The reflectivity of the light splitting element 400A can be adjusted to adjust the energy intensity of the light beam emitted by the light splitting element 400A and the energy intensity of the light beam split by the other light splitting elements 400A behind the light splitting element.

The distance between the light splitting element 400A emitting the light beam with stronger energy and the image plane is longer, and the distance between the light splitting element 400A emitting the light beam with weaker energy and the image plane is shorter. Therefore, the light beams with stronger energy are projected to the position far away from the image surface, and the light beams with weaker energy are projected to the position near the image surface, so that the illumination intensity of images formed at different distances and positions on the image surface is uniform, and the overall imaging quality is good.

The number of the light splitting elements 40A included in the light splitting module 40A can be adjusted to realize a plurality of light splitting with different numbers and different energies, and meet projection requirements of different projection distances and different image information.

It should be noted that the positions of the light splitting elements 400A with different reflection capabilities are determined according to the distances between the different positions of the light splitting module 40A and the projected image plane. The light splitting element 400A having a stronger reflection power may be disposed at a relatively distant position from the light source module 10A. The light splitting element 400A with relatively weak reflection capability is arranged at a position close to the image plane, and the light splitting element 400A with relatively weak reflection capability is arranged at a position close to the image plane, so that the illuminance of different positions of the image plane is uniform.

The farther the distance is, the smaller the illuminance is, in order to make the illuminance at the farther distance close to or consistent with the illuminance at the closer distance, the energy of the light beam emitted by the light splitting element 400A with the stronger reflection capability is stronger, and the light beam needs to be projected to the position with the farther image plane distance, and the energy of the light beam emitted by the light splitting element 400A with the weaker reflection capability is weaker and needs to be projected to the position with the closer image plane distance, so that when the human eye observes the image, the imaging illuminance at the position with the farther distance is close to the imaging illuminance at the position with the closer distance, which is more uniform, the illuminance of the whole imaging is uniform, and the image can be observed conveniently to obtain information.

The energy of the beams projected to different distances is distributed by the light splitting module 40A, so that the illuminance of the whole image is uniform.

The reflectivity of the film layer on which the surface of the light splitting element 400A is disposed is determined according to the projection requirements. In an example of the present invention, the light splitting element 400A includes at least a first light splitting element 401A and a second light splitting element 402A, the first light splitting element 401A is disposed at a position close to the light source module 10A, and the second light splitting element 402B is disposed at a last position of the light splitting module 40A, which is farthest from the light source module 10A. The first light splitting element 401A is implemented as a half-mirror lens to partially reflect and partially transmit light projected by the light source module 10A. The second light splitting element 402A is implemented as a plane mirror to totally reflect the light transmitted through the first light splitting element 401A.

It should be noted that the position of the light splitting module 40A is not limited to between the light source module 10A and the image source module 20A. In another example of the present invention, the light splitting module 40A may be disposed between the image source module 20A and the projection module 30A, and a light beam carrying image information emitted from the image source module 20A enters from one side of the light splitting module 40A, enters from one side of the light splitting module 40A after exiting from the other side of the image source module 20A, is split by the light splitting module 40A, and exits from the other side of the light splitting module 40A. After the light beam is split by the splitting module 40A, the light beam enters from one side of the projection module 30A according to the plurality of light paths 1000A and exits from the other side of the projection module 30A.

In another example of the present invention, the light splitting module 40A may be disposed on the exit side of the projection module 30A. The image source module 20A includes at least two image source regions 200A, each of the image source regions 200A has image information, and the image information of the image source regions 200A has different patterns, so that the size of the imaged light spots is the same after the images are projected to different positions of the image plane.

In an example of the present invention, the transmittance of the light beam of the image source region 200A may be set and adjusted to adjust the energy intensity of the light beam emitted from the image source region 200A, so as to make the illuminance of the images at different positions of the image plane uniform.

The light beam emitted from the light source module 10A is split by the splitting module 40A to emit a light beam having at least two energy levels from the splitting module 40A. The outgoing light beam enters from one side of the image source module 20A. The transmittance of each image source region 200A is set to adjust the energy of the light beam emitted from each image source region 200A for projection.

After the light beam emitted from the light source module 10A is adjusted in energy by the light splitting module 40A and the image source module 20A, a light beam with at least two energy levels is formed for projection. The invention further provides a projection method, comprising the following steps:

(A) projecting a beam of light having at least two energy levels along at least two optical paths 1000; and

(B) each of the optical paths 1000 is imaged at a corresponding distance position of an image plane.

The step (a) further comprises the steps of:

setting the transmittance of the light beams of at least two image source regions 200 of an image source module 20; and

light beams having at least two energy levels are emitted from each of the image source regions 200.

The transmittance of each of the image source regions 200 may be set according to actual conditions, such as a projection distance, image information, and the like, so that each of the image source regions 200 emits a light beam having different energy.

The step (a) further comprises the steps of:

providing at least two light sources 101; and

and adjusting the energy of the light beam projected by the light source 101, wherein the energy of the light beam with the longer light path 1000 is stronger, and the energy of the light beam with the shorter light path 1000 is weaker.

The light source module 10 emits light with different energy to be projected along each of the light paths 1000. Wherein the light source module 10 comprises at least two light sources 101 to form at least two light paths 1000. The energy of the light beam projected by the light source 101 is adjusted according to the length of the light path 1000, that is, the distance from the light beam to the image plane, so that the light beam with stronger energy is projected to a position with a longer distance from the image plane, and the light beam with weaker energy is projected to a position with a shorter distance from the image plane, so that the distances are different, and the image illumination is uniform.

The step (a) further comprises the steps of:

the light beam emitted by the light source is collimated by at least one collimating lens 102.

The collimating lens 102 collimates the light beam projected by the light source 101. The number of the collimating lenses 102 may be 1, and the light beams projected by the light source 101 are collimated as a whole. The number of the collimating lenses may correspond to the number of the light sources 101, so as to collimate the light beams projected by the light sources 101 respectively.

The step (a) further comprises the steps of:

emitting a light beam by at least one light source 101A; and

the light beam emitted by the light source 101A is collimated.

The light source module 10A includes at least one light source 101A to project a light beam, and the light beam is collimated by the collimating lens 102B.

The step (a) further comprises the steps of:

distributing the light beam emitted from the light source 101A by at least a dichroic element 400A; and

forming beams of different energies that propagate along at least two optical paths 1000A.

The light splitting elements 400A are sequentially disposed on the emission side of the light source 101A. The number of the light splitting elements 400A can be set according to the projection requirements. The surface of each light splitting element 400A is provided with the film layers with different reflectivity so as to reflect the light source 101A and split the light beam emitted by the light source 101A into light beams with different energy propagating along at least two light paths 1000A.

In another example of the present invention, the light beam emitted from each light splitting element 400A enters from one side of the image source module 20A, and due to the arrangement of the transmittance of each image source region 200A, the energy of the light beam emitted from the image source region 200A can be adjusted again to adapt to the actual projection requirement, so as to achieve uniform imaging illumination on the image plane.

The light splitting element 400A closer to the light source 101A reflects a light beam with stronger energy to project to a longer distance, and the light splitting element 400A farther from the light source 101A reflects a light beam with weaker energy to project to a shorter distance, so that the distances are different and the imaging illumination is uniform.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A projection system, comprising:

the light source module emits light beams;

2. The projection system of claim 1, wherein the light source module comprises at least two light sources, each of the light sources emitting a light beam, wherein the light beams projected by each of the light sources have the optical path, and the light beams projected by each of the light sources reach the image plane according to the optical path.

3. The projection system of claim 2, wherein the light source module further comprises at least two collimating lenses, each of the collimating lenses being disposed at an exit side of each of the light sources, respectively, wherein the collimating lenses collimate the light beams exiting from the light sources.

4. The projection system of claim 3, wherein the light source module further comprises a collimating lens disposed on the emitting side of the light sources for collimating the light beam emitted from each of the light sources.

5. The projection system of claim 3 or 4, wherein the light beams projected by the light source module enter from one side of the image source module along each of the light paths, exit from the other side of the image source module, enter from one side of the projection module along each of the light paths, exit from the other side of the projection module, and are projected to the image plane along each of the light paths, wherein the light beams with stronger energy are projected to a position farther away from the image plane, and the light beams with weaker energy are projected to a position closer to the image plane, so that the illuminance of the image on the image plane is uniform.

6. The projection system of claim 1, wherein the light source module comprises at least one light source and at least one collimating lens, the collimating lens being disposed on an exit side of the light source, the collimating lens collimating a light beam exiting the light source.

7. The projection system of claim 6, wherein the projection system further comprises a light splitting module disposed at an emitting side of the light source module, and the light beam emitted from the light source module is incident from one side of the light splitting module and emitted from the other side of the light splitting module.

8. The projection system of claim 7, wherein the light splitting module includes at least two light splitting elements, each of the light splitting elements is sequentially disposed on the emitting side of the light source module, and the light beam emitted from the light source module sequentially passes through each of the light splitting elements and is split by the light splitting elements to form at least two light paths.

9. The projection system of claim 8, wherein the surface of the beam splitting element is configured with a layer having different reflectivity, and the light beam projected by the light source is reflected by the beam splitting element to form at least two light paths, wherein the light beams of the light paths have different energies.

10. The projection system of claim 8, wherein the beam splitter comprises at least a first beam splitter and a second beam splitter, the first beam splitter being a half-mirror and the second beam splitter being a plane mirror, wherein the light beam emitted from the light source module is incident from one side of the first beam splitter, part of the light beam is reflected by the first beam splitter, and the other part of the light beam is transmitted through the first beam splitter, incident from one side of the second beam splitter, and reflected by the second beam splitter, and the light beam emitted from the light source module is split by the first beam splitter and the second beam splitter.

11. The projection system of claim 8, wherein the light beam reflected by the beam splitter element closer to the light source module has stronger energy, and reaches the image plane to be imaged after sequentially passing through the image source module and the projection module along the longer light path, and the light beam reflected by the beam splitter element farther from the light source module has weaker energy, and reaches the image plane to be imaged after sequentially passing through the image source module and the projection module along the shorter light path, so that the imaging illumination of the image plane is uniform.

12. The projection system of claim 2 or 6, wherein the image source module comprises at least two image source regions, each of which carries image information, wherein the transmittance of the light beam of each of the image source regions is set such that each of the image source regions emits a light beam having at least two energy levels.

13. The projection system of claim 12, wherein the longer the optical path through the image source region, the more energetic the light beam exiting the image source region is, and the shorter the optical path through the image source region, the less energetic the light beam exiting the image source region is.

14. A projection method, comprising the steps of:

15. The projection method of claim 14, wherein the step (a) further comprises the steps of:

emitting light beams through at least two light sources; and

16. The projection method of claim 14, wherein the step (a) further comprises the steps of:

17. The projection method of claim 14, wherein the step (a) further comprises the steps of:

emitting a light beam through at least one light source; and

and collimating the light beam emitted by the light source.

18. The projection method of claim 17, wherein the step (a) further comprises the steps of:

19. The projection method of claim 15 or 17, wherein the step (a) further comprises the steps of: