CN112073699B - Projection system and projection method thereof - Google Patents

Abstract

The present invention provides a projection system and a projection method thereof, wherein the projection system includes a light source module, an image source module and a projection module, wherein the light source module emits light beams, and the image source module is disposed on the light source module The output side of the image source module, wherein the image source module provides image information, the light beam from the image source module carries the image information, wherein the light beam with at least two energy levels is emitted from the image source module, and the projection module is set On the outgoing side of the image source module, the projection module projects the light beam emitted by the image source module to an image plane, and forms an image on the image plane, wherein the light beam projected by the projection module follows at least two optical paths imaging on the image plane.

Description

Projection system and projection method thereof

technical field

The present invention relates to the field of optics, and more particularly to a projection system and a projection method thereof.

Background technique

With the development of automotive lighting technology, auxiliary lights are not only used to meet the needs of supplementary light, but can also be used to display the information of the car brand, and can project different signs at the corresponding distance in front of the car to achieve human-car interaction. the goal of. Projection systems are used in auxiliary lights to project information in front of the car.

In the traditional vertical static projection system, the film is used as the image source, and the single LED is used as the light source. However, the front projection is an oblique projection. Due to the long distance between the projected images, the illumination of each pattern in the long-distance projection changes greatly, that is, the human eye can see the obvious difference between light and dark. At the same time, since the magnification of the lens is fixed, in the actual projection, in order to ensure that the size of the light spot on the image surface is consistent, the pattern on the corresponding film needs to be reduced to a certain extent. A downscaled pattern results in a further reduction in light throughput, making long-range projection patterns less illuminating than close-range patterns. It can be seen that a single light source cannot meet the requirement of uniform image surface illumination of multiple projection patterns under different projection distances.

Referring to a prior art projection system shown in FIG. 1 , the projection system includes a light source module 10P, a film 20P and a projection module 30P, the film 20P is arranged on the light source module 10P and exits side, the projection module 30P is arranged on the outgoing side of the film 20P. The light source module 10P includes only one light source 101P, and the light beam projected by the light source 101P passes through the film 20P and the projection module 30P to form an image on the image plane. Since there is only one light source 101P, the light source The light beam projected by 101P has a single energy, so that on the image plane, the illumination at a longer distance is lower, and the illumination at a closer distance is stronger, and the illumination at different distances is uneven, which is not conducive to the human eye to obtain information. Due to the strong illumination of the near imaging, it is easier to obtain information. People may choose to obtain information from the near imaging, but if the human eye focuses on observing the near imaging, the observation of the distant is reduced, which will cause danger. However, the imaging illumination in the distance is weak, and it is more difficult for the human eye to obtain information when observing the distance.

That is to say, if the projected light spot is the same at different distances, and the pattern size of the film is different, resulting in different light transmission, then the imaging illumination will be different, and the imaging illumination in the distance will be weak, which is not conducive to obtaining information. If the imaging illuminance is kept the same and the amount of light passing through the film is the same, then the pattern size of the film is the same, so that the projected spot size is inconsistent, so there will be a contradiction between the spot size and the uniform illumination.

SUMMARY OF THE INVENTION

An advantage of the present invention is to provide a projection system and a projection method thereof, wherein the images of image planes projected 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 of the light sources is set according to different distances, so that the illuminance of the image plane 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 of the light sources can be adjusted to make the illuminance of the image plane at different distances uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof. The projected light beam is divided into a plurality of light beams with different energies for projection, so that the illuminance of the image plane 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 means of different reflection capabilities, so as to make the illuminance of the image surface at different distances uniform.

Another advantage of the present invention is to provide a projection system and a projection method thereof, which split the 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 luminous power and maintaining the use cost.

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

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

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

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

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

Another advantage of the present invention is to provide a projection system and a projection method thereof, the image quality of the projection to a relatively long distance is guaranteed, it is convenient to obtain remote information and observe the remote environment, and is conducive to ensuring safety.

Another advantage of the present invention is to provide a projection system and a projection method thereof, and the images projected near and far can be observed to obtain more information.

Other advantages and features of the invention will be fully realized from the following detailed description and may be realized by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to one aspect of the present invention, a projection system of the present invention capable of achieving the foregoing objects and other objects and advantages includes:

a light source module, the light source module emits a light beam;

An image source module, the image source module is arranged on the exit side of the light source module, wherein the image source module provides image information, and the light beam exiting through the image source module carries the image information, wherein the image source module is emitted from the image source module. the module emits a light beam having at least two energy levels; and

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

According to an embodiment of the present invention, the light source module includes at least two light sources, and each of the light sources emits light beams respectively, wherein the light beams projected by each of the light sources have the optical paths respectively, and the light beams projected by each of the light sources are in accordance with the The optical path reaches the image plane.

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 respectively disposed on the exit side of each of the light sources, wherein the collimating lenses emit light to the light source. The beam is collimated.

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 exit side of the light source to collimate the light beams emitted by each of the light sources.

According to an embodiment of the present invention, the light beam projected by the light source module is incident from one side of the image source module along each of the optical paths, exits from the other side of the image source module, and travels along each of the image source modules. The light path is incident from one side of the projection module and exits from the other side of the projection module. The light beam projected by the projection module is projected to the image plane along each of the light paths, and the light beam with stronger energy is It is projected to a position farther from the image plane, and the light beam with weaker energy is projected to a position closer to the image plane, so that the illuminance of the imaging 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 the exit side of the light source, and the collimating lens is used for light beams emitted from the light source. Align.

According to an embodiment of the present invention, the projection system further includes a light splitting module, the light splitting module is arranged on the exit side of the light source module, and the light beam emitted by the light source module is incident from one side of the light splitting module, outgoing 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 arranged on the exit side of the light source module in sequence, and the light beams emitted by the light source module pass through the light splitting elements in sequence, and are The light splitting element splits light to form at least two light paths.

According to an embodiment of the present invention, the surface of the spectroscopic element is provided with a film layer with different reflectivity, and the light beam projected by the light source is reflected by the spectroscopic element to form at least two optical paths, wherein each The beams of the optical 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 transflective lens, and the second light splitting element is a flat reflection mirror, The light beam emitted by the light source module is incident from one side of the first beam splitting element, part of the beam is reflected by the first beam splitting element, the other part passes through the first beam splitting element, and is emitted from the second beam splitting element. One side is incident and is reflected by the second beam splitting element, and the light beam emitted by the light source module is split by the first beam splitting element and the second beam 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 passes through the image source module and the projection module in sequence along the longer light path After reaching the image plane for imaging, the light beam reflected by the spectroscopic element farther from the light source module has weaker energy, and passes through the image source module and the projection in turn along the shorter optical path. After the module, reach the image plane for imaging, so that the imaging illuminance of the image plane is uniform.

According to an embodiment of the present invention, the image source module includes at least two image source regions, each of the image source regions carries image information, wherein the transmittance of the light beam of each of the image source regions is set so that each The image source region emits light beams with 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 stronger, and when the light path passing through the image source region is short, the light beam from the image source region is relatively short. The energy of the light beam emitted from the image source region is relatively weak.

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

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

(B) Each of the optical paths is separately imaged at a corresponding distance position on an image plane.

According to an embodiment of the present invention, the step (A) further comprises the following steps:

exit the light beam through at least two light sources; and

The energy of the light beam projected by each of the light sources is adjusted, wherein the energy of the light beam with a longer optical path is stronger, and the energy of the light beam with a shorter optical path is weaker.

According to an embodiment of the present invention, the step (A) further comprises the following steps:

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

According to an embodiment of the present invention, the step (A) further comprises the following steps:

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

The light beam emitted by the light source is collimated.

According to an embodiment of the present invention, the step (A) further comprises the following steps:

Distributing the light beam from the light source by at least two beam splitting elements; and

Light beams having different energies propagating along at least two optical paths are formed.

According to an embodiment of the present invention, the step (A) further comprises the following steps:

setting the transmittance of light beams of at least two image source regions of one image source module; and

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

Further objects and advantages of the present invention will be fully realized by an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present invention are fully embodied by the following detailed description, drawings and claims.

Description of drawings

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

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

FIG. 2B is an enlarged schematic view of the area A in FIG. 2A .

3A is a schematic diagram of a projection system according to a variant implementation of the above preferred embodiment of the present invention.

FIG. 3B is an enlarged schematic view of region B in FIG. 3A .

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

FIG. 4B is an enlarged schematic view of region C in FIG. 4A .

Detailed ways

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

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and to simplify the description, rather than to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus the above terms should not be construed as limiting the invention.

It should be understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be one. The number may be plural, and the term "one" should not be understood as a limitation on the number.

Referring to a projection system shown in FIGS. 2A and 2B, the projection system includes at least one light source module 10, at least one image source module 20 and at least one projection module 30, the light source module 10 projects a light beam, the image source The module 20 is disposed at the exit of the light source module 10 , and the light source module 10 provides light beams 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 and exit 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 is incident 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 of the light sources 101 respectively projects a light beam to form an optical path 1000 . The light source module 10 emits light beams with at least two energy levels. The energy emitted by each of the light sources 101 is different.

The light beam projected by the light source 101 is incident 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 respectively disposed on the exit side of each of the light sources 101 . That is to say, each of the collimating lenses 102 corresponds to each of the light sources 101 respectively. The collimating lens 102 collimates the light beam emitted from the light source 101 . The light beam emitted from the light source 101 is incident from one side of the collimating lens 102 , and then exits from the other side of the collimating lens 102 after being collimated by 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 is incident 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 FIGS. 3A and 3B , the light source module 10 further includes a collimating lens 102A, and the collimating lens 102A is disposed on the exit side of each of the light sources 101 . The light beams projected by each of the light sources 101 are incident from one side of the collimating lens 102A and exit from the other side of the collimating lens 102A. The light beam projected by the light source 101 is collimated by the collimating lens 102A. The collimating lens 102A is implemented as a free-form surface collimating lens.

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

Continuing to refer to FIGS. 2A to 3B , after the light beam is emitted from the image source module 20 , it is incident 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 forms an image on the image plane, and the image information carried by the light beam is presented on the image plane. The light 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 respectively provides image information. The image information of each of the image source regions 200 presents different sizes of patterns. The image information of each of the image source regions 200 is projected to different positions on the image plane. The pattern of the image source region 200 projected to the farther position of the image plane is the smallest, and the pattern of the image source region 200 projected to the nearer position of the image plane is the largest.

According to the different projection distances, the pattern sizes of the image source regions 200 are different. The image source region 200 with a longer projection distance has a smaller pattern and is projected to a farther position on the image plane, and the pattern with a shorter projection distance is smaller. The pattern of the image source region 200 is small, and is projected to a position closer to the image plane, so that the spot sizes of the patterns imaged on the image plane are consistent.

The light beams projected by each of the light sources 101 have respective optical paths 1000 . When the projection system projects obliquely with respect to the image plane, each of the optical paths 1000 forms an included angle with the image plane. The light beam projected by the light source 101 reaches the image plane along the optical path 1000 . When the light beam projected by each of the light sources 101 is imaged on the image plane, the distance between the image and the projection system is different. Each of the optical paths 1000 has different lengths. The light source 101 with the longer optical path 1000 is projected to a farther position on the image plane, and the contrast is required to be high, and the light source 101 with the short optical path 1000 is projected to a closer position on the image plane , the illuminance of the image is similar to the illuminance of the farther image.

When the light beams of each of the optical paths 1000 have the same energy, since they reach different positions on the image plane through different distances, the imaging quality will be different, and the illuminance will be uneven. The farther the distance, the lower the illuminance. Therefore, the energy of the light beam projected by each of the light sources 101 is controlled, so that the illuminance of imaging at different positions is 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 enhanced. When the light path 1000 of the light beam projected by the light source 101 is short, the light source The energy of the light projected by 101 is smaller than that of the light source with the longer optical path 1000 , so that on the image plane, the illuminance of imaging at a longer distance and imaging at a shorter distance is uniform.

That is to say, the projection distances between each of 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, according to the projection distance, the luminous flux projected by each of the light sources 101 is adjusted, 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 by adjusting the light beam projected by the light source module 10, an image with uniform illumination can be formed on the image plane in an oblique projection state.

The illuminance of the images projected by the projection system to different distances is uniform, so that the information of the near image and the far image can be obtained, and the obtained information is large. Both distant imaging and near imaging can be observed, and it is also helpful to select an imaging position suitable for observation according to the actual situation, which is conducive to 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 size of the distance from each of the light sources 10 to the optical path 1000 of the image plane, so that the light along each of the optical paths is adjusted. When the light beam of 1000 reaches different positions on the image plane, the imaging illumination is uniform. The projection effect of the projection system on the image plane is the same or similar at different positions, which is convenient for human eyes to observe and obtain image information.

In another example of the present invention, the projection system further includes an adjustment module 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 adjustment module adjusts the energy of the light according to the size of the light path 1000 projected by each of the light sources 101 to the image plane. The adjustment module can also adjust the power of each of the light sources 101 , so that each of the light sources 101 projects light beams with different energies.

It is worth mentioning that the image source module 20 is implemented as a film, and can also be implemented as made of other light-transmitting materials. The light source 101 can be implemented as an LED light source or a laser light source. The power of the light source 101 can be adjusted to emit light beams with different energies. The number of the light sources 101 can be set according to the projection distance and the image information provided by the image source module 20, so that the imaging illumination can be 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 can be set so that each of the image source regions 200 emits light beams with different energies.

The light beams are incident from one side of the image source module 20 and exit from the other side of the image source module 20 . Exit from one side. The energy of the light beams emitted from one side of each image source area 200 can be adjusted by the transmittance of the image source area 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 stronger, and the light beam is projected to a far position on the image surface. If the rate 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 position close to the image plane, so that the illumination of the imaging at different positions on the image plane is uniform. By adjusting the energy of the light beam emitted from the light source 101 , 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, so that the illuminance of the imaging on the image plane is uniform. By designing or adjusting the transmittance of the light beams of each of the image source regions 200 of the image source module 20, the energy intensity of the light beams emitted from the image source module 20 to the projection module 30 for projection can also be adjusted. , so that the illuminance of imaging at different positions of the image plane is uniform. By adjusting the energy of the light beam emitted from the light source 101 and designing or adjusting the transmittance of the image source region 200, the energy adjustment of the light beam emitted from the image source module 20 to the projection module 30 for projection is realized, The image source module 20 is made to emit light beams having different energies and propagating along at least two optical paths 1000 for projection.

That is, by setting the transmittance of each of the image source regions 200 , the energy intensity of the light beams emitted from each of the image source regions 200 can be adjusted. When the light path passing through the image source area 200 is long, the energy of the light beam emitted from the image source area 200 is stronger, and when the light path passing through the image source area 200 is short, the light beam from the image source area 200 is relatively short. The energy of the beam emitted by the 200 is relatively weak.

In another preferred embodiment of the present invention, referring to FIGS. 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, the light source module 10A Projects a beam of light. The light splitting module 40A is disposed on the exit side of the light source module 10A. The light beam is incident 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 outgoing 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 is incident 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 outgoing side of the image source module 20A. The light beam carrying image information is incident from one side of the projection module 30A, and exits from the other side of the projection module 30A to an image plane, where the light beam is imaged on the image plane to display the image provided by the image source module 20A information.

The light splitting module 40A distributes the 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, which is projected onto the image plane according to an optical path 1000 to perform 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 exits from the other side of the collimating lens 102B. The light beam projected by the collimating lens 102B is incident from one side of the light splitting module 40A.

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

A film layer with different reflectivity is provided on the surface of each of the light splitting elements 400A. When the light beam is incident from the side of the beam splitting element 400A closest to the light source module 10A, part of the beam is reflected by the film layer of the beam splitting element 400A to exit from the beam splitting module 40A to form an optical path 1000A.

Preferably, the light splitting element 400A provided from the side of the light source module 10A is a half mirror, 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 spectroscopic element 400A provided on the outermost side is a mirror, and reflects all the light beams out.

That is to say, the light beam projected by the light source is partially reflected by the light splitting element 400A located in front, and then completely reflected by the last light splitting element 400A.

The light beam not reflected by the beam splitting element 400A closest to the light source module 10A passes through the beam splitting element 400A and continues to be projected to the next beam splitting element 400A. The light splitting module 40A exits to form another optical path 1000A.

The remaining light beams that are not reflected by the beam splitting element 400A continue to be projected to the next beam splitting element 400A, and are reflected by the beam splitting element 400A to exit the beam splitting module 40A to form another optical path 1000A until the beam It is reflected by the last spectroscopic element 400A. The light beams reflected by each of the spectroscopic elements 400A form the respective optical paths 1000A.

Due to the difference in reflectivity of the film layers of each of the light-splitting elements 400A, the energy of the light beams emitted from each of the light-splitting elements 400A is also different. The light beams emitted from each of the light splitting elements 400A continue to be incident 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, is incident from one side of the projection module 30A, exits from the other side of the projection module 30A to the image plane, and forms an image on the image plane, The image information provided by the image source module 20A is displayed.

The light beam projected by the light source module 10A is split by the beam splitting element 400A to form a plurality of the optical paths 1000A, and the energy of the light in each of the optical paths 1000A is different. The optical path 1000A extends to the image plane, and the light beam is imaged on the image plane. In each of the optical paths 1000A, the light energy of the optical path 1000A where the distance between the image plane and the light splitting element 400A is farther is stronger, and the image quality is also guaranteed when projected to a position farther away from the image plane. , the energy of the light in the optical path 1000A where the distance between the image plane and the spectroscopic element 400A is closer is relatively weak, and the illuminance of the image projected to the position closer to the image plane is the same as the illuminance of the image at a longer distance. same. That is to say, after the light is split by the light splitting element 400A, the illuminance of the image after projecting the image plane is uniform at different distances, so that the overall imaging quality is good and easy for human eyes to observe.

The reflectivity of each of the spectroscopic elements 400A is designed and adjusted according to actual requirements. The reflectivity of the film layer on the surface of each of the light splitting elements 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 on the surface of the spectroscopic element 400A, which is closer to the light source 10A, is higher, so as to reflect a stronger light beam. The film layer needs to ensure a certain transmittance, so that part of the light beam can pass through the beam splitting element 400A to reach the next beam splitting element 400A for the next beam splitting element 400A to perform beam splitting. The reflectivity of the light-splitting element 400A can be adjusted to adjust the energy intensity of the light beams emitted by the light-splitting element 400A and the energy of the light beams that can be split by the other rear light-splitting elements 400A.

The distance between the spectroscopic element 400A that emits a light beam with stronger energy and the image plane is farther, and the distance between the spectroscopic element 400A that emits a light beam with weaker energy is closer to the image plane. Therefore, a light beam with stronger energy is projected to a position farther from the image plane, and a light beam with weaker energy is projected to a position closer to the image plane, so that the illuminance of imaging at different distances and positions on the image plane is uniform. , the overall image quality is good.

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

It is worth mentioning that the positions of the spectroscopic elements 400A with different reflection capabilities are determined according to the distances between the different positions of the spectroscopic module 40A and the projected image plane. The light-splitting element 400A with strong reflective ability can be disposed at a position relatively far away from the light source module 10A. The spectroscopic element 400A with relatively weak reflection ability is set at a position closer to the image plane, and the beam splitter element 400A with relatively weak reflection ability is set at a position closer to the image plane, so that the Illumination at different locations is uniform.

The farther the distance is, the smaller the illuminance. In order to make the illuminance at a longer distance similar or consistent with the illuminance at a shorter distance, the light energy of the light beam emitted by the spectroscopic element 400A with strong reflective ability is stronger, and the light beam needs to be projected. To a position farther from the image plane, the light energy of the light beam emitted by the light splitting element 400A with weaker reflection ability is weaker, and needs to be projected to a position closer to the image plane, so that the human eye can observe it. When the image plane is used, the imaging illuminance of the farther position is similar to the imaging illuminance of the relatively close position, and the illuminance of the overall imaging is uniform, which is convenient for observing the image to obtain information.

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

The reflectivity of the film layer provided on the surface of the light splitting element 400A is determined according to 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 close to the light source module 10A, and the The second light splitting element 402B is disposed at the last position of the light splitting module 40A, which is the farthest from the light source module 10A. The first light splitting element 401A is implemented as a transflective lens, so as to partially reflect and partially transmit the light projected by the light source module 10A. The second beam splitting element 402A is implemented as a flat mirror to fully reflect the light transmitted through the first beam splitting element 401A.

It is worth mentioning 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 the light beam carrying image information emitted from the image source module 20A is split from the light beam One side of the module 40A is incident, and after exiting from the other side of the image source module 20A, it is incident from one side of the beam splitting module 40A, and then the beam is split by the beam splitting module 40A and then exits the other side of the beam splitting module 40A. out. After the beam splitting module 40A splits the light beam, the light beam enters from one side of the projection module 30A according to the plurality of optical 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 also be disposed on the exit side of the projection module 30A. The image source module 20A includes at least two image source areas 200A, each of the image source areas 200A has image information respectively, and the image information of the image source area 200A presents patterns of different sizes, so as to be projected onto the image planes differently. After the position, the size of the imaged spot is the same.

In an example of the present invention, the transmittance of the light beam in the image source region 200A can be set and adjusted to adjust the energy intensity of the light beam emitted from the image source region 200A, so that the image plane has a The illumination of the imaging at different positions is uniform.

The light beam emitted from the light source module 10A is split by the light splitting module 40A, so as to emit light beams with at least two energy levels from the light splitting module 40A. The outgoing light beam is incident from one side of the image source module 20A. By setting the transmittance of each of the image source regions 200A, the energy of the light beams emitted from each of the image source regions 200A can be adjusted for projection.

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

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

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

Described step (A) further comprises the following steps:

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

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

The transmittance of each image source region 200 can be set according to actual conditions, such as projection distance, image information, etc., so that each image source region 200 emits light beams with different energies.

Described step (A) further comprises the following steps:

providing at least two light sources 101; and

The energy of the light beam projected by the light source 101 is adjusted, 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 different energies and projects along each of the optical paths 1000 . The light source module 10 includes 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 optical path 1000, that is, the distance projected to the image surface, so that the light beam with stronger energy is projected to the position farther away from the image surface, and the energy A weaker light beam is projected to a position at a relatively close distance on the image plane, so that the imaging illumination is uniform at different distances.

Described step (A) further comprises the following steps:

The light beam emitted from 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 beam projected by the light source 101 is 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.

Described step (A) also comprises the following steps:

Emits a light beam through at least one light source 101A; and

The light beam emitted from the light source 101A is collimated.

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

Described step (A) also comprises the following steps:

Distribute the light beam emitted by the light source 101A through at least two beam splitting elements 400A; and

Light beams having different energies propagating along at least two optical paths 1000A are formed.

Each of the spectroscopic elements 400A is sequentially provided on the emission side of the light source 101A. The number of the light splitting elements 400A can be set according to projection requirements. The surface of each of the light splitting elements 400A is provided with the film layers with different reflectivities, so as to reflect the light source 101A, and divide the light beams emitted by the light source 101A into different energies along at least two of the light paths. 1000A propagating beam.

In another example of the present invention, the light beams emitted from each of the light splitting elements 400A are incident from the side of the image source module 20A. The energy of the light beam emitted by the 200A can be adjusted again to meet the actual projection requirements, so as to achieve uniform imaging illumination on the image plane.

The spectroscopic element 400A, which is closer to the light source 101A, reflects a light beam with stronger energy and projects it to a longer distance, and the spectroscopic element 400A that is farther from the light source 101A reflects a light beam with weaker energy and projects it to a farther distance. Closer distance, so that the distance is different and the imaging illumination is uniform.

It should be understood by those skilled in the art that the embodiments of the present invention shown in the above description and the accompanying drawings are only examples and do not limit the present invention. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention may be modified or modified in any way without departing from the principles.

Claims (19)

1. A projection system, comprising:

the light source module emits light beams;

The image source module is arranged on the emergent side of the light source module, provides image information, and light beams emitted by the image source module carry the image information, emits light beams with at least two energy levels from the image source module, is provided with at least two image source regions, provides the image information respectively, and presents patterns with different sizes; and

the projection module is arranged on the emergent side of the image source module and projects light beams emitted by the image source module to an image surface for imaging on the image surface, wherein the light beams projected by the projection module are imaged on the image surface along at least two light paths, the light beams with stronger energy are projected to the position far away from the image surface, the light beams with weaker energy are projected to the position near the image surface, the pattern of the image source region projected to the position far away from the image surface is smaller, and the pattern of the image source region projected to the position near the image surface is larger, so that the imaging illumination of the image surface is uniform.

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 2, 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 are incident from one side of the image source module, exit from the other side of the image source module, and are incident from one side of the projection module and exit from the other side of the projection module along each of the optical paths, and the light beams projected by the projection module are projected to the image plane along each of the optical paths.

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, the light splitting module is disposed at an emitting side of the light source module, and a 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 a 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 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:

(A) projecting a light beam having at least two energy levels propagating along at least two optical paths, comprising: setting at least two image source regions of an image source module, so that the image source regions respectively provide image information, and the sizes of patterns presented by the image information of the image source regions are different; and

(B) Each light path is imaged at a position corresponding to an image plane, the light beam with stronger energy is projected to a position far away from the image plane, the light beam with weaker energy is projected to a position near the image plane, so that the illumination of the image plane is uniform, the pattern of the image source area projected to the position far away from the image plane is smaller, and the pattern of the image source area projected to the position near the image plane is larger.

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

emitting light beams by 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.

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

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

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:

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.

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

setting the transmittance of the light beams of the at least two image source areas; and

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

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