CN220455659U - Projection system and projection equipment - Google Patents

Abstract

The utility model provides a projection system and projection equipment, comprising an illumination module, a first reflection module, a light processing module, a second reflection module and a projection lens. The projection lens comprises at least two lenses, the illumination module is arranged on the light incident side of the first reflection module, the light processing module is arranged between the light emergent side of the first reflection module and the light incident side of the second reflection module, and the at least two lenses are sequentially arranged on the light emergent side of the second reflection module. In the projection system, the first reflection module and the second reflection module are used for folding the light path, so that the compactness of the light path is improved, and the whole volume of the projection system can be reduced.

Description

Projection system and projection equipment

Technical Field

Embodiments of the present disclosure relate to the field of optical technologies, and in particular, to a projection system and a projection device.

Background

With the progress of technology, more people are reporting, video or viewing programs by using projectors. A projector, also called a projector, is a device capable of projecting images or videos onto a curtain, and can play corresponding video signals by being connected with a computer, VCD, DVD, BD, a game machine, DV and the like through different interfaces. Projectors are widely used in homes, offices, schools, and recreational areas, and according to different modes of operation, there are CRT, LCD, DLP, 3LCD, etc.

In the existing single-chip LCD projector, the optical path is generally complex, and the total optical path length is long, which causes the increase of the projector area.

Disclosure of Invention

The utility model provides a projection system and projection equipment, which adopt two reflection modules to fold a light path, so that the volume of a projector can be effectively reduced.

The technical scheme adopted by the embodiment of the utility model is as follows: there is provided a projection system comprising: the device comprises an illumination module, a first reflection module, a light processing module, a second reflection module and a projection lens. The projection lens comprises at least two lenses, the illumination module is arranged on the light incident side of the first reflection module, the light processing module is arranged between the light emergent side of the first reflection module and the light incident side of the second reflection module, and the at least two lenses are sequentially arranged on the light emergent side of the second reflection module. Wherein the illumination module is used for providing an illumination beam; the first reflection module is used for reflecting the illumination light beam to the light processing module; the light processing module is used for receiving the illumination light beam and generating an image light beam with image information, emitting the image light beam to the second reflecting module and shaping the image light beam; the second reflection module is used for reflecting the image light beam to the projection lens; the at least two lenses are used for shaping the image light beams in sequence.

In some embodiments, the light processing module includes a first fresnel lens, a display device, and a second fresnel lens. The first Fresnel lens, the display device and the second Fresnel lens are sequentially arranged between the light emitting side of the first reflection module and the light entering side of the second reflection module.

In some embodiments, the display device comprises an LCD; the first Fresnel lens, the LCD and the second Fresnel lens are sequentially arranged between the light emitting side of the first reflection module and the light entering side of the second reflection module.

In some embodiments, the light processing module further comprises a polarizing beam splitting device; the polarization beam splitter is arranged between the first Fresnel lens and the LCD and is used for transmitting light beams in a first polarization state.

In some embodiments, the polarizing beam splitter device includes a reflective polarizing film, an absorptive polarizing film, and a glass substrate; the reflective polarizing film is attached to the first side of the absorption polarizing film, the second side of the absorption polarizing film is attached to the first side of the glass substrate, and the reflective polarizing film, the absorption polarizing film and the glass substrate are sequentially arranged between the first Fresnel lens and the LCD; the reflective polarizing film is used for transmitting the light beam in the first polarization state and reflecting the light beam in the second polarization state, and the absorptive polarizing film is used for transmitting the light beam in the first polarization state and absorbing the light beam in the second polarization state.

In some embodiments, the at least two lenses include a first lens, a second lens, a third lens, and a fourth lens; the first lens, the second lens, the third lens and the fourth lens are sequentially arranged on the light emitting side of the second reflecting module.

In some embodiments, the first lens, the second lens, and the fourth lens are all positive lenses, and the third lens is a negative lens.

In some embodiments, the light incident surface and the light emergent surface of the first lens are both convex; the light incident surface of the second lens is a convex surface, and the light emergent surface of the second lens is a concave surface; the light incident surface and the light emergent surface of the third lens are concave surfaces; the light incident surface of the fourth lens is a plane, and the light emergent surface of the fourth lens is a convex surface.

In some embodiments, the illumination module includes a light source and a hyperbolic condenser lens; the light incident side of the hyperboloid condenser lens is arranged on the light emergent side of the light source, and the light incident side of the first reflection module is arranged on the light emergent side of the hyperboloid condenser lens.

In a second aspect, embodiments of the present utility model also provide a projection apparatus, which includes a projection system according to any one of the embodiments of the first aspect.

Compared with the prior art, the utility model has the beneficial effects that: unlike the prior art, embodiments of the present utility model provide a projection system and a projection apparatus, which include an illumination module, a first reflection module, a light processing module, a second reflection module, and a projection lens. The projection lens comprises at least two lenses, the illumination module is arranged on the light incident side of the first reflection module, the light processing module is arranged between the light emergent side of the first reflection module and the light incident side of the second reflection module, and the at least two lenses are sequentially arranged on the light emergent side of the second reflection module. In the projection system, an illumination beam emitted by an illumination module is reflected to a light processing module through a first reflection module; then, the light processing module generates an image beam, and the image beam is reflected to the projection lens through the second reflecting module; then, the image beam exits through the projection lens. In the projection system, the first reflection module and the second reflection module are used for folding the light path, so that the compactness of the light path is improved, and the whole volume of the projection system can be reduced.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements/modules and steps, and in which the figures do not include the true to scale unless expressly indicated by the contrary reference numerals.

FIG. 1 is a schematic diagram of a projection system according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a projection lens according to an embodiment of the present utility model;

FIG. 3 is a graph of the modulation transfer function of the projection lens shown in FIG. 2;

fig. 4 is a graph of curvature of field and distortion of the projection lens of fig. 2.

Detailed Description

The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.

In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific examples. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

It should be noted that, if not conflicting, the various features of the embodiments of the present utility model may be combined with each other, which are all within the protection scope of the present application. In addition, although functional block division is performed in the device schematic, in some cases, block division may be different from that in the device. Moreover, the words "first," "second," and the like as used herein do not limit the data and order of execution, but merely distinguish between identical or similar items that have substantially the same function and effect.

In a first aspect, an embodiment of the present utility model provides a projection system, referring to fig. 1 and 2 in combination, the projection system includes: an illumination module 10, a first reflection module 20, a light processing module 30, a second reflection module 40 and a projection lens 50.

The projection lens 50 includes at least two lenses, the illumination module 10 is disposed on the light incident side of the first reflection module 20, the light processing module 30 is disposed between the light emitting side of the first reflection module 20 and the light incident side of the second reflection module 40, and the at least two lenses are sequentially disposed on the light emitting side of the second reflection module 40.

Wherein the illumination module 10 is used for providing an illumination beam. The first reflection module 20 is used for reflecting the illumination beam to the light processing module 30. The light processing module 30 is configured to receive the illumination beam and generate an image beam with image information, and to emit the image beam to the second reflection module 40, and to shape the image beam. The second reflection module 40 is used for reflecting the image beam to the projection lens 50. At least two lenses are used to sequentially shape the image beam.

In one specific embodiment, the illumination module 10 and the first reflection module 20 are sequentially disposed along a first direction, the first reflection module 20, the light processing module 30 and the second reflection module 40 are sequentially disposed along a second direction, and the second reflection module 40 and the projection lens 50 are sequentially disposed along a third direction, wherein the second direction is not parallel to the first direction, and the second direction is not parallel to the third direction. The first direction and the third direction may be parallel but opposite to each other, and in order to make the structure more compact, the first direction may be perpendicular to the second direction, and the second direction may be perpendicular to the third direction, for example, in fig. 1, the first direction is a horizontal left direction, the second direction is a vertical upward direction, and the third direction is a horizontal right direction.

The display device 32 may be a projection chip such as a liquid crystal on silicon (Liquid Crystal on Silicon, LCoS), a digital light processing chip (Digital Light Processing, DLP), or a Micro light emitting diode (Micro-Light Emitting Diode, micro-LED), an organic light emitting diode (Organic Light Emitting Diode, OLED), a liquid crystal display (Liquid Crystal Display, LCD), etc., for receiving illumination light, modulating the illumination light into image light, and outputting the image light, which may be specifically selected according to practical needs. The description herein uses an LCD as the display device 32, which upon receiving an illumination beam, generates an image beam of a first polarization state.

In the projection system, an illumination beam emitted by the illumination module 10 is reflected by the first reflection module 20 to the light processing module 30; then, the light processing module 30 generates an image beam and outputs the image beam to the second reflecting module 40; then, the second reflection module 40 reflects the image beam to the projection lens 50; then, the image beam exits through the projection lens 50.

Therefore, in the projection system, the overall light path arrangement is regular, and the first reflection module 20 and the second reflection module 40 are used for folding the light path, so that the compactness of the light path is improved, the overall volume of the projection system can be reduced, and the volume of the projection device can be reduced when the projection system is subsequently applied to the projection device.

In some of these embodiments, referring to fig. 1, the light processing module 30 includes a first fresnel lens 31, a display device 32, and a second fresnel lens 33. The first fresnel lens 31, the display device 32 and the second fresnel lens 33 are disposed in this order between the light outgoing side of the first reflection module 20 and the light incoming side of the second reflection module 40.

In the present embodiment, the first fresnel lens 31 is used to collimate the illumination beam, the display device 32 is used to receive the illumination beam and generate the image beam, and the second fresnel lens 33 is used to shape the image beam together with the projection lens 50 to magnify the image beam for imaging. In practical applications, other collimating devices may be used to collimate the illumination beam.

In some of these embodiments, referring to FIG. 1, display device 32 comprises an LCD. The first fresnel lens 31, the LCD, and the second fresnel lens 33 are disposed in this order between the light-emitting side of the first reflection module 20 and the light-entering side of the second reflection module 40. The LCD may receive the illumination beam and emit an image beam, which may be 5 inches in size and 1080P in resolution.

In some of these embodiments, referring to FIG. 1, display device 32 also includes a polarization splitting device 34; a polarization splitting device 34 is arranged between the LCD and the first fresnel lens 31, and the polarization splitting device 34 is configured to transmit the light beam of the first polarization state.

The illumination beam is usually natural light, and belongs to unpolarized light, while the LCD is a polarized light illumination device, which only needs a first polarized light beam for illumination, if there is no polarization splitting device 34, half of the light energy (the second polarized light beam) in the illumination beam will be wasted on the LCD, and the second polarized light beam in the illumination beam will cause life reduction and even high temperature damage due to the temperature increase of the LCD after being absorbed by the LCD. In this embodiment, the illumination beam is reflected by the first reflection module 20 and then exits to the LCD through the polarization beam splitter 34, and since the polarization beam splitter 34 has polarization splitting capability, it can reflect light of the second polarization state and transmit light of the first polarization state to the LCD, so that the polarization degree of the illumination beam incident to the LCD can be improved, the display contrast of the LCD can be improved, the light of the second polarization state incident to the LCD can be reduced, the temperature of the LCD can be reduced, and the service life can be prolonged. The light in the first polarization state may be vertically linearly polarized light, the light in the second polarization state may be horizontally linearly polarized light, and in practical application, the light in the first polarization state may be horizontally linearly polarized light, and the light in the second polarization state may be vertically linearly polarized light.

In some of these embodiments, polarizing beam splitter 34 includes a reflective polarizing film and an absorptive polarizing film. The reflective polarizing film and the absorptive polarizing film are disposed in sequence between the LCD and the first fresnel lens 40. The reflective polarizing film is used for transmitting the light beam in the first polarization state and reflecting the light beam in the second polarization state, and the absorptive polarizing film is used for transmitting the light beam in the first polarization state and absorbing the light beam in the second polarization state.

In practical applications, the reflectivity of the reflective polarizing film to the light beam of the second polarization state is not 100%, and there is still a small amount of light beam of the second polarization state transmitted through the reflective polarizing film. It is understood that the transmission axis of the absorption-type polarizing film is disposed in the same direction as the transmission axis of the reflection-type polarizing film.

In some of these embodiments, polarization splitting device 34 further comprises a glass substrate; the reflective polarizing film is attached to the first side of the absorption polarizing film, the second side of the absorption polarizing film is attached to the first side of the glass substrate, and the reflective polarizing film, the absorption polarizing film and the glass substrate are sequentially disposed between the first fresnel lens 31 and the LCD. In this embodiment, by providing a glass substrate, it is possible to conveniently provide a reflection-type polarizing film and an absorption-type polarizing film in the optical path.

In some of these embodiments, referring to fig. 2, at least two lenses include a first lens 51, a second lens 52, a third lens 53, and a fourth lens 54. The first lens 51, the second lens 52, the third lens 53 and the fourth lens 54 are sequentially disposed on the light emitting side of the second reflection module 40, and in this embodiment, the image beam is reflected by the second reflection module 40 and then sequentially shaped by the first lens 51, the second lens 52, the third lens 53 and the fourth lens 54 to be emitted.

In some of these embodiments, the first lens 51, the second lens 52, the third lens 53, and the fourth lens 54 are spherical lenses. The materials of the first lens 51, the second lens 52, the third lens 53 and the fourth lens 54 may be optical glass. In the present embodiment, the first lens 51, the second lens 52, the third lens 53 and the fourth lens 54 are spherical lenses, which is convenient for lens processing.

In some of these embodiments, the first lens 51, the second lens 52 and the fourth lens 54 are all positive lenses, focusable light rays, and the third lens 53 is a negative lens, divergeable light rays.

In one embodiment, referring to fig. 2, the light incident surface S1 and the light emergent surface S2 of the first lens 51 are both convex; the light incident surface S3 of the second lens 52 is a convex surface, and the light emergent surface S4 of the second lens 52 is a concave surface; the light incident surface S5 and the light emergent surface S6 of the third lens 53 are concave surfaces; the light incident surface S7 of the fourth lens 54 is a plane, and the light emergent surface S8 of the fourth lens 54 is a convex surface. The light incident surface of the lens is a surface close to the first reflection module 40, and the light emergent surface is a surface far away from the first reflection module 40.

Specifically, referring to fig. 2, the surface parameters of each lens may be as follows: the first lens 51 has a center thickness of 6.5mm, a radius of curvature of the light incident surface S1 of 460.8mm, a radius of curvature of the light emergent surface S2 of-134.6 mm, and is made of crown glass H-ZK11, and has a refractive index of 1.54 and an Abbe number of 55.5. The second lens 52 has a center thickness of 9.9mm, a radius of curvature of the light incident surface S3 of 56.7mm, a radius of curvature of the light emergent surface S4 of 83.2mm, and is made of crown glass H-ZK11, and has a refractive index of 1.54 and an Abbe number of 55.5. The third lens 53 has a center thickness of 6.0mm, a radius of curvature of the light incident surface S5 of-74.9 mm, a radius of curvature of the light emergent surface S6 of 95.1mm, and is made of crown glass H-ZF1, and has a refractive index of 1.65 and an Abbe number of 33.8. The center thickness of the fourth lens 54 is 11.0mm, the curvature radius of the light incident surface S7 is infinity (plane), the curvature radius of the light emergent surface S8 is-57.8 mm, the material is crown glass H-ZK11, the refractive index is 1.54, and the Abbe number is 55.5. The first lens 51, the second lens 52, and the fourth lens 54 are positive lenses, and the third lens 53 is a negative lens.

Referring to fig. 3, fig. 3 is a graph of a modulation transfer function of the projection lens 50 shown in fig. 2, which can comprehensively reflect the imaging quality of the projection lens 50, and the smoother the curve shape, the higher the height relative to the X-axis, which proves that the better the imaging quality of the system. As can be seen from fig. 3, the MTF curve is smoother, and the modulation transfer function value (OTF mode value) of the full field of view at the spatial frequency of 7lp/mm is greater than 0.15, so that the aberration of the projection lens 50 in this embodiment is well corrected, and the imaging quality is good.

Fig. 4 is a field curvature and distortion diagram of the eye projection lens 50 shown in fig. 2, wherein (a) in fig. 4 is a field curvature curve, and (b) in fig. 4 is a distortion curve. The field curvature is an aberration of the object plane forming a curved image, characterized by a meridional field curvature and a sagittal field curvature, which are too large to seriously affect the off-axis ray imaging quality of the projection lens 50. As can be seen from fig. 4, the curvature of field is in the range of 2mm, i.e., the curvature of field of the projection lens 50 is corrected to a smaller range. Meanwhile, when the distortion of the system is less than 4%, it is difficult for human eyes to perceive, and as can be seen from fig. 4, the maximum distortion of the projection lens 50 is less than 4%, that is, the field curvature and distortion of the projection lens 50 in the embodiment are small, and the imaging effect is good.

As can be seen from the above data, the projection lens 50 provided in the present embodiment has the advantages of simple structure, small size, good aberration correction, and good imaging quality.

In the projection lens 50, by reasonably arranging the positive and negative focal lengths, refractive indexes and abbe numbers of the four lenses, after light rays sequentially pass through the positive and negative lenses to be converged and diverged to different degrees, the projection ratio of less than or equal to 1.2 can be achieved, the f-number can reach 2.5, the requirements of miniaturization and large picture of a single-chip LCD projector can be met, and 1080P high-definition imaging can be achieved. Compared with a projection system using three glass lenses to form the projection lens 50, in this embodiment, four spherical lenses are used as the projection lens 50 to adapt to an LCD with 5 inches and 1080P resolution, which can improve resolution and aperture, reduce projection ratio, match the high definition display requirement of the LCD, for example, up to 1080P and above, and improve output luminous flux, for example, more than 500 lumens. Namely, the projection system provided by the embodiment has the characteristics of high resolution, large aperture and small projection ratio, can project a larger picture in a shorter distance, and can realize 1080P high-definition display.

In some of these embodiments, the first reflective module 20 comprises a first mirror and the second reflective module 40 comprises a second mirror. The reflecting mirror comprises a substrate and a reflecting film layer, wherein the substrate can be made of glass or plastic, the reflecting film layer can be a dielectric reflecting film or a metal reflecting film, and the reflecting film layer can be plated on the substrate in a vapor plating or magnetron sputtering mode or stuck on the substrate through back glue. In practical application, the specific material of the reflecting mirror can be selected according to practical requirements.

In some of these embodiments, referring to fig. 1, an illumination module 10 includes a light source 11 and a hyperbolic condenser lens 12. The light incident side of the hyperboloid condenser lens 12 is disposed on the light emergent side of the light source 11, and the light incident side of the first reflection module 20 is disposed on the light emergent side of the hyperboloid condenser lens 12.

Specifically, the light source 11 may be an LED, the hyperboloid condenser lens 12 is a single lens with a plano-convex structure, the plane of which is disposed adjacent to the LED, and the convex surface of which is hyperboloid and is disposed adjacent to the first reflection module 20. The LED may be a white light source 11 or a three-color light source 11, and may directly output white light or output three-primary color light, where the three-primary color light is mixed into white light by a light guide plate, for example, may be a three-color point light source 11, and the three-primary color light is output through three R, G, B beads arranged in a line, which may be specifically selected according to actual needs.

In the illumination module 10, the illumination beam emitted from the LED is focused by the hyperboloid condenser lens 12 and then shaped into a rectangular spot. Compared with the use of rotationally symmetrical aspheric lenses, parabolic or polyhedral conical reflector cups (reflectors) as the condensing lenses to collect the LED light sources 11, the hyperbolic condensing lenses 12 are used in the embodiment to improve the condensing effect, shape the light spot of the illumination beam into rectangular light spots, and match the shape of the LCD, so as to improve the energy utilization rate of the light sources 11, improve the illumination uniformity, and improve the viewing experience of users, thereby improving the output luminous flux of the projector, such as more than 500 lumens, and improving the brightness uniformity of the projection picture, such as more than 75%.

In a second aspect, embodiments of the present utility model provide a projection device comprising a projection system according to any of the embodiments of the first aspect. In this embodiment, the projection system has the same structure and function as the projection system according to any one of the embodiments of the first aspect, which is not described herein. The projection device may be a projector.

It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (10)

1. A projection system, comprising: the device comprises an illumination module, a first reflection module, a light processing module, a second reflection module and a projection lens;

the projection lens comprises at least two lenses, the illumination module is arranged on the light incident side of the first reflection module, the light processing module is arranged between the light emergent side of the first reflection module and the light incident side of the second reflection module, and the at least two lenses are sequentially arranged on the light emergent side of the second reflection module;

wherein the illumination module is used for providing an illumination beam;

the first reflection module is used for reflecting the illumination light beam to the light processing module;

the light processing module is used for receiving the illumination light beam and generating an image light beam with image information, emitting the image light beam to the second reflecting module and shaping the image light beam;

the second reflection module is used for reflecting the image light beam to the projection lens;

the at least two lenses are used for shaping the image light beams in sequence.

2. The projection system of claim 1 wherein the light processing module comprises a first fresnel lens, a display device, and a second fresnel lens;

the first Fresnel lens, the display device and the second Fresnel lens are sequentially arranged between the light emitting side of the first reflection module and the light entering side of the second reflection module.

3. The projection system of claim 2, wherein the display device comprises an LCD;

the first Fresnel lens, the LCD and the second Fresnel lens are sequentially arranged between the light emitting side of the first reflection module and the light entering side of the second reflection module.

4. The projection system of claim 3 wherein the light processing module further comprises a polarizing beam splitter;

the polarization beam splitter is arranged between the first Fresnel lens and the LCD and is used for transmitting light beams in a first polarization state.

5. The projection system of claim 4 wherein the polarizing beam splitter comprises a reflective polarizing film, an absorptive polarizing film, and a glass substrate;

the reflective polarizing film is attached to the first side of the absorption polarizing film, the second side of the absorption polarizing film is attached to the first side of the glass substrate, and the reflective polarizing film, the absorption polarizing film and the glass substrate are sequentially arranged between the first Fresnel lens and the LCD;

the reflective polarizing film is used for transmitting the light beam in the first polarization state and reflecting the light beam in the second polarization state, and the absorptive polarizing film is used for transmitting the light beam in the first polarization state and absorbing the light beam in the second polarization state.

6. The projection system of any of claims 1-5 wherein the at least two lenses comprise a first lens, a second lens, a third lens, and a fourth lens;

the first lens, the second lens, the third lens and the fourth lens are sequentially arranged on the light emitting side of the second reflecting module.

7. The projection system of claim 6 wherein the first lens, the second lens, and the fourth lens are all positive lenses and the third lens is a negative lens.

8. The projection system of claim 7 wherein the projection system is configured to,

the light incident surface and the light emergent surface of the first lens are convex;

the light incident surface of the second lens is a convex surface, and the light emergent surface of the second lens is a concave surface;

the light incident surface and the light emergent surface of the third lens are concave surfaces;

the light incident surface of the fourth lens is a plane, and the light emergent surface of the fourth lens is a convex surface.

9. The projection system of any of claims 1-5 wherein the illumination module comprises a light source and a hyperbolic condenser lens;

the light incident side of the hyperboloid condenser lens is arranged on the light emergent side of the light source, and the light incident side of the first reflection module is arranged on the light emergent side of the hyperboloid condenser lens.

10. A projection device comprising a projection system as claimed in any one of claims 1-9.