CN217846873U - Illumination system and projection apparatus - Google Patents

Abstract

The utility model discloses a lighting system and projection equipment belongs to projection technical field. The lighting system includes: light source subassembly, reflecting plate and digital micro mirror device. The reflective region of the reflector plate can direct at least a portion of the light beam emitted by the light source assembly toward the digital micromirror device. The light source component comprises a light source component, a reflecting plate and a digital micromirror device, wherein a first specified distance is arranged between the center of a light spot irradiated to the reflecting plate by a light beam emitted by the light source component and the center of the reflecting area, so that the reflecting area of the reflecting plate can cut the light spot provided by the light source component and reflect the cut light spot to the digital micromirror device, the area of a flat light spot generated by the digital micromirror device is smaller, the flat light spot entering the projection lens is reduced, and the contrast of the illumination system can be improved.

Description

Illumination system and projection apparatus

Technical Field

The utility model relates to a projection technology field, in particular to lighting system and projection equipment.

Background

The laser projection display technology is a novel projection display technology in the current market, and has the characteristics of high picture contrast, clear imaging, bright color and higher brightness compared with an LED projection product, and the remarkable characteristics gradually enable the laser projection display technology to become a mainstream development direction in the market. A Digital Micromirror Device (DMD) in a projection apparatus includes a plurality of rotatable micromirrors, and the positions of light spots emitted from the DMD can be controlled by the rotatable micromirrors.

An illumination system comprising a digital micromirror device and a prism, the digital micromirror device capable of emitting a light beam in three states: an on light beam, a flat light beam, and an "off light beam, and a prism can separate the imaging light beam (" on "light beam) and the non-imaging light beam (flat light beam and" off light beam) of the digital micromirror device to direct the imaging light beam to the projection lens while preventing the non-imaging light beam from being incident on the projection lens.

The area of the flat light spot formed by the flat light beam in the illumination system is larger, and partial light in the flat light spot is easier to enter the projection lens, so that the quality of a projection display picture of the illumination system is poorer.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an illumination system and projection equipment. The illumination system and the projection device are as follows:

according to an aspect of the utility model, a lighting system is provided, lighting system includes:

the light source component, the reflecting plate and the digital micro-mirror device are sequentially arranged along the light path direction of the illumination system;

the reflecting plate is positioned in the light emergent direction of the light source component, the reflecting plate is provided with a reflecting area, the reflecting area reflects at least part of light beams emitted by the light source component to the digital micro-mirror device, the center of light spots irradiated on the reflecting plate by the light beams has a first specified distance with the center of the reflecting area, and the center of the reflecting area is positioned on one side, away from the light source component, of the center of the light spots;

the digital micro-mirror device is used for processing the received light beam and then leading the light beam out of the illumination system.

Optionally, the reflective plate includes a substrate and a reflective film located on the substrate, the reflective film is located in the reflective area, the reflective film is attached to the surface of the substrate, and a second specified distance is provided between the reflective film and at least a part of the edge of the substrate;

the lighting system further comprises a shell and a mounting bracket assembled in the shell, wherein the mounting bracket is fixedly connected with the substrate, and the size of the mounting bracket is matched with that of the substrate.

Optionally, the reflector further includes a light-transmitting region, the light-transmitting region is located at one side of the reflection region close to the light source assembly, and the light-transmitting region is connected to the reflection region.

Optionally, the reflective plate includes a substrate, and a reflective film and an anti-reflection film on the substrate, the reflective film is located in the reflective region, and the anti-reflection film is located in the transmissive region.

Optionally, the reflecting plate further includes a light absorbing region, the light absorbing region is located on a side of the reflecting region close to the light source assembly, and the light absorbing region is connected to the reflecting region.

Optionally, the digital micromirror device has a rectangular light-receiving area, an included angle between one side of the rectangular light-receiving area and a target projection is 40 degrees to 50 degrees, the target projection is a connection line between the center of the reflection area and the center of the light spot, and is an orthogonal projection on a plane where the rectangular light-receiving area is located.

Optionally, a ratio of the length of the first designated distance to a dimension of the reflection plate in a first direction is in a range of 2% to 15%, and the first direction is a direction parallel to a line connecting a center of the light spot and a center of the reflection area.

Optionally, an included angle between the light-receiving surface of the reflection plate and a plane where the rectangular light-receiving area is located is 45 degrees.

Optionally, the illumination system further includes a prism unit, the prism unit is surrounded by a light incident surface, a reflecting surface and a light emergent surface, the reflecting plate is located outside the light incident surface, the digital micromirror device is located outside the light emergent surface, the light incident surface is configured to receive the light beam reflected by the reflecting plate and guide the received light beam to the reflecting surface, and the reflecting surface is configured to reflect the received light beam to the light emergent surface.

According to another aspect of the present invention, there is provided a projection apparatus, comprising the above-mentioned illumination system.

The embodiment of the utility model provides a beneficial effect that technical scheme brought includes at least:

an illumination system is provided that may include a light source assembly, a reflector plate, and a digital micromirror device. The reflective region of the reflector plate can direct at least a portion of the light beam emitted by the light source assembly toward the digital micromirror device. Wherein, the light beam that the light source subassembly sent shines has first appointed distance between the center of the facula on the reflecting plate and the center of reflecting region, so, the reflecting region of reflecting plate can cut the facula that light source assembly provided, and will cut the facula reflection to the digital micro mirror device after, can make the area of the flat facula that the digital micro mirror device produced less, in order to reduce the flat facula that gets into projection lens, can improve lighting system's contrast, and then can reach the effect that improves lighting system's projection display picture's quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without creative efforts.

FIG. 1 is a schematic diagram of light extraction from an illumination system;

FIG. 2 is a schematic diagram of three states of light spots emerging from the illumination system shown in FIG. 1;

fig. 3 is a schematic structural diagram of an illumination system provided in an embodiment of the present invention;

FIG. 4 is a schematic diagram of the position structure of the reflecting plate and the light spots in the illumination system shown in FIG. 3;

FIG. 5 is a schematic diagram of three states of light spots emerging from the illumination system shown in FIG. 3;

fig. 6 is a schematic structural diagram of a reflection plate according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a planar light spot emitted by an illumination system according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a mounting bracket according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of another reflecting plate provided in an embodiment of the present invention;

fig. 10 is a schematic view of the lighting system shown in fig. 3, viewed in a second direction;

FIG. 11 is a schematic diagram of the structure of the illuminated reflector and digital micromirror device of FIG. 10;

fig. 12 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention.

With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of light extraction from an illumination system. The illumination system 10 includes a light source assembly 11, a reflector 12, a prism unit 13, and a digital micro-mirror device 14, and fig. 1 shows a schematic diagram of three states of light spots that the illumination system 10 can emit, where the three states of light spots are: an "on" light spot, a flat spot, and an "off light spot.

The digital micromirror device can be regarded as an optical switch composed of a plurality of micro mirrors, namely, the optical switch can be switched on and off by utilizing the rotating micro mirrors, the number of the mirror pieces is determined by the display resolution, one small mirror piece corresponds to one pixel, and the micro mirrors are the minimum working units and are also the key for influencing the performance of the micro mirrors. The micro-mirrors are very small, each having a separate support frame and making a positive or negative n-degree (n > 0) deflection around the hinge tilt axis. Two electrodes may be arranged at the two corners of the micro mirror to control the deflection of the micro mirror by means of a voltage.

The micro-mirror works by means of reflected light, when the micro-mirror is in an open State (English: on State, namely the micro-mirror deflects by + n degrees), namely the incident angle of incident light (light source) reaches n degrees, and the reflection angle also reaches n degrees (the sum of the incident angle and the reflection angle is 2n degrees), at the moment, the energy of the light which can be received by the lens is maximum; if the micro-mirror is in the Off State (i.e. the micro-mirror deflects by-n degrees), the energy of the light received by the lens is minimum, and the brightness is minimum.

As shown in fig. 2, fig. 2 is a schematic diagram of light spots emitted by the illumination system shown in fig. 1 in three states. The "on" light beam corresponding to the "on" light spot can enter the projection lens to become an image light beam, an included angle is formed between the "off" light beam corresponding to the "off" light spot and the "on" light beam, and the "off" light beam can not be incident into the projection lens.

However, due to the light reflected by the cover glass on the dmd and the diffraction effect caused by the micromirrors on the dmd, a flat light spot, which may also be referred to as an intermediate light spot, exists between the "on" light spot and the "off" light spot, and the flat light spot exists in the emergent light path of the dmd when the micromirrors are in the on state or the off state. The beam that forms the flat spot and the "off" light spot is a non-imaging beam.

Part of the light beams in the flat state light beams can become stray light and enter the projection lens, so that the contrast of the projection equipment is reduced, namely when the digital micromirror device is in a closed state, the projection equipment displays a black field picture, the black field picture represents a completely black image, and the stray light can reduce the contrast of the black field picture, so that the display effect of the projection equipment is influenced.

An embodiment of the utility model provides an illumination system and projection equipment can solve the problem among the above-mentioned correlation technique.

Referring to fig. 3, fig. 4 and fig. 5, fig. 3 is a schematic structural diagram of an illumination system according to an embodiment of the present invention, fig. 4 is a schematic structural diagram of positions of a reflection plate and light spots in the illumination system shown in fig. 3, and fig. 5 is a schematic diagram of light spots in three emergent states of the illumination system shown in fig. 3. The lighting system 20 comprises: a light source assembly 21, a reflective plate 22, and a digital micromirror device 23 sequentially arranged along the optical path direction of the illumination system 20. The reflective plate 22 may be located in a light emitting direction of the light source assembly 21.

The light source assembly 21 may have an overall optical structure, the light source assembly 21 may include optical elements such as light emitting units and lenses, and the light emitting direction of the light source assembly 21 may refer to the transmission direction of the light beam emitted by the overall light source assembly 21. The light beam emitted from the light source assembly 21 may be irradiated to the reflective plate 22. The reflective plate 22 may have a reflective region 22a, the reflective region 22a may be used for reflecting light beams, and the reflective region 22a may reflect at least a part of the light beams emitted from the light source assembly 21 to the dmd 23. The digital micromirror device 23 can be used to process the received light beam out of the illumination system 20.

As shown in fig. 5, the illumination system 20 can emit light spots in three states: the projection lens comprises an on light spot, a flat light spot and an off light spot, wherein the on light spot is an imaging light beam and can enter a light inlet of the projection lens, and the flat light spot and the off light spot are non-imaging light beams.

A first specified distance L1 is provided between a center p1 of a light spot s1 irradiated onto the reflection plate 22 by the light beam provided by the light source assembly 21 and a center p2 of the reflection region 22a, and the center p2 of the reflection region 22a is located on a side of the center p1 of the light spot s1 away from the light source assembly 21. That is, an intersection of the optical axis of the light beam provided by the light source assembly 21 and the reflective plate 22 has a first prescribed distance L1 from the center p2 of the reflective area 22 a.

As shown in fig. 4, a part of the light spot s1 irradiated by the light source assembly 21 onto the reflector 22 is located in the reflective area 22a of the reflector 22, and a part of the light spot s1 is located outside the reflective area 22a of the reflector 22, so that the reflective area of the reflector 22 can cut the light spot s1 and reflect a part of the light beam in the light spot s1 to the dmd. The area of the flat light spot reflected by the digital micromirror device is smaller, which is equivalent to cutting one side of the flat light spot close to the 'on' light spot, so that the non-imaging light beam output by the digital micromirror device can be reduced to irradiate to the projection lens, the influence of the non-imaging light beam emitted by the digital micromirror device on the contrast of a projection display picture can be reduced, the contrast of the illumination system can be improved, and the effect of improving the quality of the projection display picture of the illumination system can be achieved.

To sum up, embodiments of the present invention provide an illumination system, which may include a light source assembly, a reflector plate and a digital micromirror device. The reflective region of the reflector plate can direct at least a portion of the light beam emitted by the light source assembly toward the digital micromirror device. Wherein, the light beam that the light source subassembly sent shines has first appointed distance between the center of the facula on the reflecting plate and the center of reflecting region, so, the reflecting region of reflecting plate can cut the facula that light source module provided, and the facula after will cutting reflects digital micro mirror device, can be so that the area of the flat facula that digital micro mirror device produced is less, with the flat facula that reduces to get into projection lens, can improve lighting system's contrast, and then can reach the effect that improves lighting system's projection display picture's quality.

Optionally, as shown in fig. 6, fig. 6 is a schematic structural diagram of a reflection plate according to an embodiment of the present invention. The reflective plate 22 may include a substrate 221 and a reflective film 222 disposed on the substrate 221, the reflective film 222 is disposed in the reflective region 22a, the reflective film 222 is attached in the plate surface of the substrate 221, and a second specified distance L2 is provided between the reflective film 222 and at least a portion of the edge of the substrate 221. The plate surface of the substrate 221 may be rectangular, the reflective film 222 may be rectangular, and the second predetermined distance L2 may be equal to the first predetermined distance L1.

It can be understood that, in the embodiment of the present invention, the F number of the illumination system matches the F number of the projection lens. Wherein the F-number of the lighting system may satisfy the following formula:

F＝1/2sinθ

and theta is the light-emitting angle of the light beam emitted by the illumination system. The light receiving capacity of the lighting system is inversely proportional to the square of the F-number of the lighting system. I.e. the larger the F-number of the illumination system, the less light flux will enter the illumination system. The F number of the projection lens can be the same as the light receiving capacity of the representation projection lens, and the larger the F number of the projection lens is, the smaller the light receiving angle of the projection lens is. The F number of the projection lens can be slightly smaller than that of the illumination system, so that the projection lens can completely receive the light emitted by the illumination system, and the brightness of the projection equipment is improved.

As shown in fig. 7, fig. 7 is a schematic structural diagram of a planar light spot emitted by an illumination system according to an embodiment of the present invention. By changing the area of the reflective film 222, part of the light beams with larger angles in the light beams irradiating the reflective plate 22 can be cut off, the included angle between the included angle of the part of the light beams with larger angles and the optical axis of the light beams is 40-70 degrees, so as to adjust the angle of the light beams received by the digital micro-mirror device, and further adjust the light outgoing angle of the part of the light beams emitted by the illumination system, which is equivalent to adjusting the F number of the illumination system, so as to prevent stray light in the illumination system from entering the projection lens.

As shown in fig. 5, since the optical axis of the light beam corresponding to the "on" light spot is perpendicular to the plane of the rectangular light receiving area of the dmd, the angle between the optical axis of the light beam corresponding to the "on" light spot and the normal of the plane of the rectangular light receiving area is about 24 °, and the angle between the optical axis of the light beam corresponding to the "off" light spot and the normal of the plane of the rectangular light receiving area is about 48 °. That is, the exit angle of the light beam corresponding to the flat light spot and the off light spot is larger, and the exit angle is the included angle between the optical axis of the light beam emitted by the digital micromirror device and the normal of the plane where the rectangular light receiving area is located. Therefore, the size of the light spot of the off light, the size of the light spot of the flat state and the size of the light spot of the on light in the light spots of the plurality of states emitted by the digital micro-mirror device are reduced in sequence. Accordingly, the size of the spot from which the "off" light spot is cut, the size of the spot from which the flat spot is cut, and the size of the spot from which the "on" light spot is cut are sequentially reduced after the light beam emitted from the light source unit 21 is cut on the reflection plate 22. Moreover, because the light spots emitted by the digital micromirror device are in Gaussian distribution, the central brightness of the light spots is greater than the brightness of the edges of the light spots, and the influence on the overall brightness of the 'on' light spots (namely imaging light beams) is small after part of light rays with larger angles are cut. Therefore, there is little change in the shape of the "on" light spot after the reflector 22 cuts some of the more angled rays of the light beam. Whereas the shapes of the brightness of the flat state spot and the "off" light spot are greatly changed.

When the projection device displays a black field picture (namely, the digital micromirror device is in a closed state), the picture brightness is the light brightness of the flat light spot entering the projection lens.

As shown in fig. 8, fig. 8 is a schematic structural diagram of a mounting bracket according to an embodiment of the present invention. The lighting system 20 may further include a housing 24 and a mounting bracket 25 mounted inside the housing 24, the mounting bracket 25 may be fixedly connected with the substrate 221, and the size of the mounting bracket 25 matches the size of the substrate 221. In this way, the size of the spot reflected by the reflector 22 can be cut to different degrees by adjusting the size of the reflective film 222 on the substrate 221 without changing the sizes of the substrate 221 and the mounting bracket 25. Also, the influence on other components inside the housing 24 can be reduced.

Alternatively, as shown in fig. 6, the reflection plate 22 may further include a light-transmitting region 22b, the light-transmitting region 22b may be located at a side of the reflection region 22a close to the light source assembly 21, and the light-transmitting region 22b may be connected to the reflection region 22 a. The substrate 221 may be a glass substrate, and the reflective region 22a and the transmissive region 22b may be divided on the substrate 221, and a reflective film may be coated in the reflective region 22a, so that the reflective region 22a has a reflective function.

The light beam emitted from the light source assembly 21 irradiates the reflective plate 22, wherein the light beam irradiating the reflective area 22a can be reflected to the dmd 23, and the light beam irradiating the transparent area 22b can penetrate through the transparent substrate and irradiate to the inner side of the housing of the illumination system 20, which can be coated with a light absorbing material to absorb the light beam penetrating the transparent area 22b, so as to prevent the light beam from affecting other structures.

Optionally, as shown in fig. 6, the reflection plate 22 may further include a reflection film 222 and an anti-reflection film 223 on the substrate 221, wherein the reflection film 222 is located in the reflection region 22a, and the anti-reflection film 223 is located in the light transmission region 22b. The reflector 22 may be a lens with an integral structure, and the transparent region 22a and the reflective region 22b may be divided on the transparent substrate 221, and then the reflective film 222 is plated in the transparent region 22a, and the anti-reflection film 223 is plated in the transparent region 22b, so that the reflector 22 may have both functions of transmission and reflection. The anti-reflection film 223 may reduce the reflection light of the surface of the substrate 221, thereby increasing the amount of light transmission of the substrate 221 to reduce the stray light in the illumination system 20.

Alternatively, as shown in fig. 9, fig. 9 is a schematic structural diagram of another reflecting plate provided in an embodiment of the present invention. The reflection plate 22 may further include a light absorption region 22c, the light absorption region 22c may be located at a side of the reflection region 22a close to the light source assembly 21, and the light absorption region 22c may be connected to the reflection region 22 a.

The substrate 221 in the reflective plate 22 may be a transparent glass substrate or a non-transparent metal substrate, the reflective region 22a and the light absorption region 22c may be divided on the substrate 221, and a reflective film 224 is coated in the reflective region 22a to make the reflective region 22a have a reflective function, and a light absorption film 224 is coated in the light absorption region 22c to prevent the light beam irradiated to the light absorption region 22c from being transmitted to the digital micro-mirror device or other structures, so as to reduce the stray light in the illumination system 20.

The reflector 22 may further be connected to a heat sink, and when the light beam emitted from the light source assembly is emitted to the reflector 22, the heat sink may lower the temperature on the reflector 22, so as to prevent the reflector 22 from being deformed or damaged.

Alternatively, as shown in fig. 10 and 11, fig. 10 is a schematic structural diagram of the illumination system shown in fig. 3 when viewed along the second direction, and fig. 11 is a schematic structural diagram of the reflective plate and the digital micromirror device in illumination shown in fig. 10. The second direction f2 is a direction perpendicular to the plane of the light receiving surface of the digital micromirror device 13. It should be noted that, in fig. 10, the light emitting unit 211 is not shown in order to more clearly show the shape of the dodging unit 212.

The digital micro-mirror device 23 may have a rectangular light receiving area 231, an included angle α between one side k1 of the rectangular light receiving area 231 and a target projection k2 is 40 degrees to 50 degrees, and the target projection k2 is a connection line between a center p2 of the reflection area and a center p1 of the light spot, and is an orthogonal projection on a plane where the rectangular light receiving area 231 is located. Further, the angle α may be 45 degrees.

The digital micromirror device 23 may be a 0.65 inch digital micromirror device. In this way, the incident light in the rectangular light receiving area 231 near the reflective plate 22 is less, the brightness of the flat light spot emitted by the digital micromirror device near the "on" light spot is less, and the flat light spot entering the projection lens can be reduced.

Alternatively, as shown in fig. 4, the ratio of the length of the first designated distance L1 to the size of the reflective plate 22 in the first direction f1 ranges from 2% to 15%, and the first direction f1 is a direction parallel to a line connecting the center p1 of the light spot and the center p2 of the reflective area 22 a. In this range, the flat light spot can be prevented from entering the projection lens, and the influence of the smaller size of the reflection region 22a on the brightness uniformity of the illumination system and the brightness of the projection device can be avoided.

Illustratively, the size of the reflective plate 22 in the first direction f1 is 100mm, and the first prescribed distance L1 ranges from 2mm to 15mm.

Alternatively, the light receiving surface of the reflective plate 22 may form an angle of 45 degrees with the plane where the rectangular light receiving region 231 of the dmd 23 is located. The reflector 22 may be used to fold the light path to reduce the size of the illumination system 20 in the light exit direction of the light source module 21.

Optionally, as shown in fig. 3, the illumination system 20 may further include a prism unit 26, the prism unit 26 is surrounded by an incident surface, a reflecting surface and an exit surface, the reflector 22 is located outside the incident surface, and the dmd 23 is located outside the exit surface, the incident surface is used for receiving the light beam reflected by the reflector 22 and guiding the received light beam to the reflecting surface, and the reflecting surface is used for reflecting the received light beam to the exit surface.

The illumination system 20 may further comprise a third lens 27, which third lens 27 may be located outside the light entry face of the prism unit 26.

The light source module 21 may include a light emitting unit 211, a light unifying unit 212, a first lens 213, and a second lens 214. The light emitting unit 211 can emit a light beam to a light entrance of the light homogenizing unit 212, the light homogenizing unit 212 homogenizes the received light beam and emits the homogenized light beam to a first lens 213 from the light exit, the first lens 213 converges the light beam and guides the light beam to a second lens 214, the second lens 214 converges the light beam again and guides the converged light beam to the reflecting plate 22, the reflecting plate 22 reflects the light beam irradiated to the reflecting region 22a to the third lens 27, the third lens 27 transmits the received light beam to the light entrance surface of the prism unit 26, the light beam can be totally reflected on the reflecting surface of the prism unit 26 and irradiates the digital micromirror device 23 through the light exit surface of the prism unit 26, the digital micromirror device 23 processes the received light beam, reflects the processed light beam to the light exit surface of the prism unit 26, and transmits the light exit surface and the reflecting surface of the prism unit 26 and enters the projection lens.

The first lens 213 may be a spherical lens or an aspherical lens; the second lens 214 may be a spherical lens or an aspherical lens; the third lens 27 may be a spherical lens or an aspherical lens. Specific lens specification selection embodiments of the present invention are not limited herein.

The light spot emitted by the light emitting unit 211 may be a circular light spot, the light spot homogenized by the light homogenizing unit 212 may be a rectangular light spot, the rectangular light spot is converged by the first lens 213 and the second lens 214, the light spot transmitted to the reflecting plate 22 may be an elliptical light spot, the elliptical light spot is cut by the reflecting area 22a of the reflecting plate 22, and after the light spot is converged by the third lens 27, the light spot is totally reflected to the digital micromirror device by the prism unit, and the rectangular light spot is formed on the digital micromirror device again.

An orthogonal projection of the optical axis of the light beam reflected by the reflecting plate 22 on the plane of the rectangular light receiving region 231 forms an angle of 45 degrees with the long side of the rectangular light receiving region 231.

Optionally, the illumination system may further include a galvanometer assembly, which may be positioned between the digital micromirror device and the prism unit. The lighting beam guided by the prism unit to the digital micro-mirror device is transmitted to the digital micro-mirror device after penetrating through the vibrating mirror component, the digital micro-mirror device modulates the received beam and then guides the modulated beam to the vibrating mirror component, and the vibrating mirror component processes the beam emitted by the digital micro-mirror device and then guides the processed beam to the prism unit and guides the processed beam to the lens through the prism unit. The galvanometer component can comprise a flat piece of glass, and the staggered transmission of the light beams is realized through high-frequency vibration. The galvanometer component is positioned at a position close to the digital micromirror device, and light beams at the position are converged on a light receiving surface of the digital micromirror device, so that light spots are small, the galvanometer component with a smaller size can be selected, and the size of the illumination system can be further reduced.

The light homogenizing component can be a light guide pipe or a fly eye lens and can be used for shaping and homogenizing laser spots incident from the light source. Beam homogenization refers to the shaping of a beam with uneven intensity distribution into a beam with uniform cross-section distribution through beam transformation. Laser speckle refers to the interference of light beams to form bright or dark spots, creating random grainy intensity patterns, when a laser light source is used to illuminate a rough surface such as a screen or any other object that produces diffuse reflection or diffuse transmission.

The light guide pipe is a tubular device formed by splicing four plane reflection sheets, namely a hollow light guide pipe, light rays are reflected for multiple times in the light guide pipe to achieve the effect of light uniformization, the light guide pipe can also adopt a solid light guide pipe, the light inlet and the light outlet of the light guide pipe are rectangles with uniform shapes and areas, light beams enter from the light inlet of the light guide pipe and then are emitted from the light outlet of the light guide pipe, and light beam homogenization and laser spot optimization are completed in the process of passing through the light guide pipe. Fly-eye lenses are usually formed by combining a series of small lenses, two columns of fly-eye lens arrays are arranged in parallel to divide the light spots of an input laser beam, and the divided light spots are accumulated by a subsequent focusing lens, so that the light beams are homogenized and the light spots are optimized.

Illustratively, the dodging assembly has a rectangular light outlet, and the short side of the light outlet of the dodging assembly is parallel to the long side of the rectangular light receiving area of the digital micromirror device.

To sum up, embodiments of the present invention provide an illumination system, which may include a light source assembly, a reflective plate and a digital micromirror device. The reflective region of the reflector plate can direct at least a portion of the light beam emitted by the light source assembly toward the digital micromirror device. Wherein, the light beam that the light source subassembly sent shines has first appointed distance between the center of the facula on the reflecting plate and the center of reflecting region, so, the reflecting region of reflecting plate can cut the facula that light source assembly provided, and will cut the facula reflection to the digital micro mirror device after, can make the area of the flat facula that the digital micro mirror device produced less, in order to reduce the flat facula that gets into projection lens, can improve lighting system's contrast, and then can reach the effect that improves lighting system's projection display picture's quality.

Furthermore, the utility model also provides a projection equipment, projection equipment includes the lighting system in above-mentioned any embodiment. Fig. 12 is a schematic structural diagram of a projection apparatus according to an embodiment of the present invention. As can be seen with reference to fig. 12, the projection device may include: an illumination system 20 and a projection lens 30. Light source subassembly 21 among the lighting system can include three-colour laser light source, and the laser beam of multiple colour can be taken out to this three-colour laser light source, and light valve among the lighting system can handle laser beam to the light beam direction projection subassembly 30 after will handling, and then realize the formation of image function.

The light source assembly 21 may further include a diffusion unit 215, and the diffusion unit 215 may include a diffusion wheel or a diffusion sheet, and the diffusion wheel or the diffusion sheet may be configured to perform speckle reduction on the light beam emitted by the light emitting unit 211 and guide the light beam after the speckle reduction to the dodging unit 212.

The light emitting unit 211 may include a blue laser emitter 2111, a green laser emitter 2112, a red laser emitter 2113, a first dichroic plate 2114, a second dichroic plate 2115, which is a filter that may be almost completely transparent to light of a certain wavelength and almost completely reflective to light of other wavelengths, and a lens assembly 2116.

The first dichroic plate 2114 may be configured to transmit blue laser light and reflect green laser light, the second dichroic plate 2115 may be configured to transmit red laser light beams and reflect blue and green laser light beams, and the lens assembly 2116 may be configured to converge the light beams and direct the converged light beams to the diffusion unit 212.

It is noted that in the drawings, the size of regions may be exaggerated for clarity of illustration. Also, it will be understood that when an element or layer is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. In addition, it will be understood that when an element is referred to as being "under" another element or layer, it can be directly under the other element or intervening elements may also be present. In addition, it will also be understood that when an element is referred to as being "between" two elements, it can be the only element between the two elements, or more than one intervening element may also be present. Like reference numerals refer to like elements throughout.

In the present application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only an optional embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An illumination system is characterized by comprising a light source component, a reflecting plate and a digital micro-mirror device which are sequentially arranged along the direction of a light path of the illumination system;

the reflecting plate is positioned in the light emergent direction of the light source component, the reflecting plate is provided with a reflecting area, the reflecting area reflects at least part of light beams emitted by the light source component to the digital micro-mirror device, a first specified distance is reserved between the center of light spots irradiated on the reflecting plate and the center of the reflecting area, and the center of the reflecting area is positioned on one side, away from the light source component, of the center of the light spots;

the digital micro-mirror device is used for processing the received light beam and then leading the light beam out of the illumination system.

2. The illumination system according to claim 1, wherein the reflection plate comprises a substrate and a reflection film on the substrate, the reflection film is located in the reflection area, the reflection film is attached in a plate surface of the substrate, and a second specified distance is provided between the reflection film and at least a part of an edge of the substrate;

the lighting system further comprises a shell and a mounting bracket assembled in the shell, wherein the mounting bracket is fixedly connected with the substrate, and the size of the mounting bracket is matched with that of the substrate.

3. The illumination system of claim 1, wherein the reflector further comprises a light-transmissive region, the light-transmissive region is located on a side of the reflector near the light source assembly, and the light-transmissive region is connected to the reflector.

4. The illumination system of claim 3, wherein the reflector plate comprises a substrate, and a reflective film and an anti-reflection film on the substrate, wherein the reflective film is located in the reflective region, and the anti-reflection film is located in the light-transmitting region.

5. The illumination system as recited in claim 1, wherein the reflective plate further comprises a light absorbing region, the light absorbing region is located on a side of the reflective region close to the light source module, and the light absorbing region is connected to the reflective region.

6. The illumination system of claim 1, wherein the dmd has a rectangular light receiving area, an angle between one side of the rectangular light receiving area and a target projection is 40 to 50 degrees, the target projection is a line connecting the center of the reflection area and the center of the light spot, and the target projection is an orthographic projection on a plane of the rectangular light receiving area.

7. The illumination system according to claim 1, wherein a ratio of a length of the first prescribed distance to a dimension of the reflection plate in a first direction, which is a direction parallel to a line connecting the center of the light spot and the center of the reflection area, is in a range of 2% to 15%.

8. The illumination system according to claim 6, wherein an angle between a light-receiving surface of the reflection plate and a plane in which the rectangular light-receiving area is located is 45 degrees.

9. The illumination system of claim 1, further comprising a prism unit, wherein the prism unit is surrounded by an incident surface, a reflecting surface and an emergent surface, the reflector is located outside the incident surface, the dmd is located outside the emergent surface, the incident surface is configured to receive the light beam reflected by the reflector and direct the received light beam to the reflecting surface, and the reflecting surface is configured to reflect the received light beam to the emergent surface.

10. A projection device comprising an illumination system as claimed in any one of the claims 1 to 9.

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