CN117572712A - Projection optical machine and projection equipment - Google Patents

Abstract

The invention relates to a projection optical machine and projection equipment, wherein the projection optical machine comprises a light source, a dodging component, a brightness adjusting module and an imaging component which are sequentially arranged along the direction of an optical path, and the imaging component comprises an imaging chip and a lens; the light incident side of the imaging chip is positioned at the light emergent side of the brightness adjusting module, the light incident side of the lens is positioned at the light emergent side of the imaging chip, and the axis of the lens and the center of the imaging chip are not collinear in the direction of the optical axis; the brightness adjusting module comprises at least two brightness adjusting lenses; at least one of the brightness adjusting lenses is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and at least one of the brightness adjusting lenses is used for being arranged in a staggered manner relative to the optical axis of the light beam; and/or at least one brightness adjusting lens is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and the axle center of the brightness adjusting lens is used for being arranged in a staggered way relative to the optical axis of the light beam. The brightness of the projection picture can be uniformized by arranging the brightness adjusting lens.

Description

Projection optical machine and projection equipment

Technical Field

The disclosure relates to the field of projection technology, and in particular, to a projection light machine and a projection device including the same.

Background

In the related art, most of projection light machines adopt a design of fixedly mounting a lens, in order to enable projection equipment to be horizontally arranged on a tabletop, projection pictures are not influenced by the tabletop, the projection pictures are often designed to be projected obliquely, the axle center of the lens is required to deviate from the center of an imaging chip, when the axle center of the lens just corresponds to the center of the long end edge of the chip, the edge below the projection picture just emits in parallel, at the moment, the imaging chip is farthest from the far end of the axle center of the lens, the center of one long side of the imaging chip coincides with the axle center of the lens, the distance is closest, that is, the brightness of the picture correspondingly projected from the two corners of the far end of the imaging chip is lowest, the brightness of the picture correspondingly projected from the center of the long side of the imaging chip, which coincides with the axle center of the lens, is highest, and therefore the brightness difference of each part of the projected picture is large, and the brightness uniformity of the picture is poor.

Disclosure of Invention

The disclosure discloses a projection optical machine and projection equipment, which can solve the technical problems in the related art.

In a first aspect, the present disclosure relates to a projection light engine, the projection light engine including a light source, a light homogenizing component, a brightness adjusting module, and an imaging component sequentially arranged along a light path direction, the imaging component including an imaging chip and a lens;

The light incident side of the imaging chip is positioned at the light emergent side of the brightness adjusting module, the light incident side of the lens is positioned at the light emergent side of the imaging chip, and the axis of the lens and the center of the imaging chip are not collinear in the direction of the optical axis; the brightness adjusting module comprises at least two brightness adjusting lenses;

at least one of the brightness adjusting lenses is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and at least one other of the brightness adjusting lenses is used for being arranged in a staggered manner relative to the optical axis of the light beam; and/or the number of the groups of groups,

at least one brightness adjusting lens is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and the axle center of the brightness adjusting lens is used for being arranged in a staggered mode relative to the optical axis of the light beam.

Wherein at least two of the brightness adjusting lenses are used for being inclined at the same or different angles relative to the optical axis; and/or the axes of at least two brightness adjusting lenses are used for being positioned on the same side or different sides of the optical axis, and the axes of at least two brightness adjusting lenses are the same or different in size from the optical axis.

The brightness adjusting module comprises a first brightness adjusting lens and a second brightness adjusting lens, wherein the first brightness adjusting lens and the second brightness adjusting lens are parallel to each other, and the first brightness adjusting lens and the second brightness adjusting lens are inclined at a first angle with respect to an optical axis;

The first axis of the first brightness adjusting lens and the second axis of the second brightness adjusting lens are positioned on the same side of the optical axis, and the distance between the first axis and the optical axis and the distance between the second axis and the optical axis are both of a first size.

The brightness adjusting module further comprises a third brightness adjusting lens, the third brightness adjusting lens is inclined by a second angle relative to the optical axis, a third axis of the third brightness adjusting lens and the first axis are located on the same side or different sides of the optical axis, and the distance between the third axis and the optical axis is a second size.

The light homogenizing component comprises a light spot shaping lens group and a light homogenizing element group, wherein the light incident side of the light spot shaping lens group is positioned on the light emergent side of the light source, the light incident side of the light homogenizing element group is positioned on the light emergent side of the light spot shaping lens group, and the light incident side of the brightness adjusting module is positioned on the light emergent side of the light homogenizing element group.

Wherein the light homogenizing element group comprises a first light homogenizing element which is configured as a fly eye lens; or,

the light homogenizing element group comprises a second light homogenizing element and a third light homogenizing element, the light incident side of the second light homogenizing element is positioned at the light emergent side of the facula shaping lens group, the light incident side of the third light homogenizing element is positioned at the light emergent side of the second light homogenizing element, and the light incident side of the brightness adjusting module is positioned at the light emergent side of the third light homogenizing element; wherein the second light homogenizing element is configured as a diffusion wheel, and the third light homogenizing element is configured as a light rod.

Wherein the fly-eye lens includes a plurality of unit lenses, each of which includes a first fly-eye and a second fly-eye;

the first compound eye and the second compound eye in at least one unit lens are used for being obliquely arranged relative to the optical axis of the light beam, and the oblique angle of the first compound eye relative to the optical axis is the same as the oblique angle of the second compound eye relative to the optical axis; and/or the number of the groups of groups,

the first axis of the first fly's eye in at least one of the unit lenses is not collinear with the second axis of the second fly's eye.

The projection light machine further comprises a light machine shell, and the light homogenizing component and the brightness adjusting module are both arranged in the light machine shell;

the brightness adjusting lens is movably arranged in the optical machine shell and used for being inclined at different angles relative to the optical axis; and/or, the distance between the axis of the brightness adjusting lens and the optical axis is different.

The brightness adjusting module further comprises a detection module, a control module and a driving mechanism, wherein the detection module is electrically connected with the control module, and the control module is electrically connected with the driving mechanism;

the detection module is used for detecting a first distance between a projection point of the axis of the lens on the imaging chip and the center of the imaging chip;

The control module can be configured to: and controlling the driving mechanism to drive the brightness adjusting lens to move according to the first distance detected by the detection module.

The brightness adjusting lenses are two and are respectively a first brightness adjusting lens and a second brightness adjusting lens, and the brightness adjusting module further comprises a rotating shaft and a moving shaft;

the rotating shaft is connected with the first brightness adjusting lens and is rotatably connected with the optical machine shell around an axis perpendicular to the optical axis, and the moving shaft is connected with the second brightness adjusting lens and is movably connected with the optical machine shell along a direction perpendicular to the optical axis;

the driving mechanism comprises a first driving part and a second driving part, and the first driving part and the second driving part are electrically connected with the control module; the first driving part can drive the rotating shaft to rotate around an axis vertical to the optical axis, and the second driving part can drive the moving shaft to move along a direction vertical to the optical axis.

Wherein the inclination angle of the brightness adjusting lens relative to the optical axis is not less than 70 degrees and less than 90 degrees; and/or the axle center of the brightness adjusting lens is used for being arranged in a staggered way relative to the optical axis, the maximum size of the brightness adjusting lens in the direction perpendicular to the optical axis is a third size, and the distance between the axle center of the brightness adjusting lens and the optical axis is not more than one fifth of the third size.

The projection optical engine further comprises an optical engine shell, and an installation groove for installing the brightness adjusting lens is formed in the inner wall of the optical engine shell; the mounting groove enables the brightness adjusting lens mounted thereon to be obliquely arranged relative to the optical axis; and/or the mounting groove can enable the axle center of the brightness adjusting lens mounted on the mounting groove to be arranged in a staggered mode relative to the optical axis.

Wherein the imaging assembly further comprises a prism; the light incident surface of the prism is positioned at the light emergent side of the brightness adjusting module, the first light emergent surface of the prism is positioned at the light incident side of the imaging chip, and the second light emergent surface of the prism is positioned at the light incident side of the lens.

Wherein the projection light machine further comprises a reflecting mirror;

the light incident side of the reflector is positioned at the light emergent side of the light homogenizing component, and the light emergent side of the reflector is positioned at the light incident side of the brightness adjusting module; or,

the light incident side of the reflecting mirror is positioned at the light emergent side of the brightness adjusting module, and the light emergent side of the reflecting mirror is positioned at the light incident side of the imaging component; or,

the light incident side of the reflecting mirror is positioned at the light emergent side of one brightness adjusting lens, and the light emergent side of the reflecting mirror is positioned at the light incident side of the other brightness adjusting lens.

In a second aspect, the present disclosure also relates to a projection device comprising the projection light engine.

In the above technical solution, since the axis of the lens and the center of the imaging chip are not collinear in the direction of the optical axis, the brightness of the projected image will be uneven. Through set up the luminance adjustment module between dodging subassembly and imaging module, and this luminance adjustment module includes two at least luminance adjustment lenses, through carrying out the slope setting for the optical axis with luminance adjustment lens and/or make axle center and optical axis dislocation arrangement to can make the light that passes through luminance adjustment lens be non-circumference symmetric distribution, that is, the light of outgoing exists the region that luminance is strong and the region that luminance is weak. Because the light incident side of the imaging chip is positioned at the light emergent side of the brightness adjusting module, more light rays can be emitted to the area with weak brightness of the projection picture corresponding to the imaging chip through the arrangement of inclination (inclination relative to the optical axis) and/or off-axis (dislocation arrangement relative to the optical axis) of the brightness adjusting lens, fewer light rays can be emitted to the area with strong brightness of the projection picture corresponding to the imaging chip, so that the uniformity of the brightness of the projection picture is realized, and the cost is effectively reduced while the structure is simple.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.

Fig. 1 is a schematic diagram of a projection light engine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the first brightness adjustment lens is disposed obliquely with respect to the optical axis, and a second axis of the second brightness adjustment lens is disposed offset from the optical axis.

Fig. 2 is a schematic diagram of a projection light machine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the second brightness adjustment lens is disposed obliquely with respect to the optical axis, and a first axis of the first brightness adjustment lens is disposed offset from the optical axis.

Fig. 3 is a schematic diagram of a projection light machine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the first brightness adjustment lens is disposed obliquely with respect to the optical axis and has a first axis offset from the optical axis, and the second brightness adjustment lens is disposed perpendicular to the optical axis and has a second axis on the optical axis.

Fig. 4 is a schematic diagram of a projection light machine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the second brightness adjustment lens is disposed obliquely with respect to the optical axis and has a second axis offset from the optical axis, and the first brightness adjustment lens is disposed perpendicular to the optical axis and has a first axis on the optical axis.

Fig. 5 is a schematic diagram of a projection optical engine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the first brightness adjustment lens and the second brightness adjustment lens are disposed obliquely and parallel to each other, and a first axis of the first brightness adjustment lens and a second axis of the second brightness adjustment lens are located on the same side of the optical axis and have the same distance from the optical axis.

Fig. 6 is a schematic diagram of a projection light machine according to an embodiment of the disclosure, where the brightness adjustment module includes a first brightness adjustment lens, a second brightness adjustment lens, and a third brightness adjustment lens, where the first brightness adjustment lens and the second brightness adjustment lens are both inclined by a first angle and a distance away from the first dimension of the optical axis, and the third brightness adjustment lens is inclined by a second angle and a distance away from the second dimension of the optical axis.

Fig. 7 is a schematic diagram of a first light homogenizing element of a projection optical engine according to an embodiment of the disclosure, where the first light homogenizing element is configured as a fly eye lens, and the fly eye lens is also capable of performing brightness compensation in an optical path, and a shadow part is a light beam.

Fig. 8 is a schematic view of a part of a first optical machine housing of a projection optical machine according to an embodiment of the disclosure.

Fig. 9 is a schematic view of a portion of a second optical housing of a projection optical machine according to an embodiment of the disclosure.

Reference numerals illustrate:

1. light source 2 dodging component

21. Spot shaping lens 211 spot shaping lens

22. First light equalizing element of light equalizing element group 221

2211. First compound eye of unit lens 2212

2213. Second compound eye 222 second light homogenizing element

223. Third light homogenizing element 3 brightness adjusting module

301. First brightness adjusting lens 302 second brightness adjusting lens

303. Third brightness adjusting lens 31 brightness adjusting lens

4. Imaging assembly 41 imaging chip

42. Lens 40 prism

401. First light-emitting surface of the light-in surface 402

403. Second light-emitting surface 5 ray machine shell

50. First mounting groove of mounting groove 501

502. Second mounting groove 51 first optical machine housing

52. Optical axis of second optical machine shell A

a first axis b second axis

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings of the embodiments of the present disclosure, in which it is evident that the described embodiments are only some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

It should be noted that the terms "first," "second," and the like in this disclosure are used merely to distinguish one from another device, module, or unit, and are not intended to limit the order in which the functions performed by the devices, modules, or units

Or interdependence.

Most of projection light machines adopt a design of fixedly mounting lenses, in order to enable projection equipment to be horizontally arranged on a tabletop, projection pictures are not influenced by the tabletop, the pictures are often designed to be projected obliquely, the function is achieved by enabling the axis of the lenses to deviate from the center of an imaging chip, when the axis of the lenses just corresponds to the center of the long end edge of the chips, the edges below the projection pictures just emit in parallel, at the moment, the imaging chip is farthest from the two angles of the far end of the axis of the lenses, the center of one long side of the imaging chip coincides with the axis of the lenses, the distance is closest, that is, the brightness of the pictures correspondingly projected from the two angles of the far end of the imaging chip is lowest, the brightness of the pictures correspondingly projected from the center of the long side of the imaging chip coincides with the axis of the lenses is highest, and therefore the brightness difference of each part of the projected pictures is large, and the uniformity of the brightness of the pictures is poor.

In the related art, in order to solve the problem of poor uniformity of brightness of the above-mentioned picture, the relative illumination brightness of the lens is often improved to reduce the difference of light receiving efficiency between the far angle of the imaging chip and the center of the long side of the chip, but this way often brings about the problems of reduced edge definition, increased volume of the lens, increased cost and the like.

Based on the above-described problems, referring to fig. 1 to 9, the inventors of the present disclosure provide a projection light machine including a light source 1, a dodging component 2, a brightness adjusting module 3, and an imaging component 4 sequentially arranged in a light path direction, the imaging component 4 including an imaging chip 41 and a lens 42. The light incident side of the imaging chip 41 is positioned at the light emergent side of the brightness adjusting module 3, the light incident side of the lens 42 is positioned at the light emergent side of the imaging chip 41, and the axis of the lens 42 and the center of the imaging chip 41 are not collinear in the direction of the optical axis A; the brightness adjustment module 3 comprises at least two brightness adjustment lenses 31. At least one of the brightness adjusting lenses 31 is arranged obliquely relative to the optical axis a of the light beam emitted by the light source 1, and at least one of the axes of the other brightness adjusting lenses 31 is arranged in a staggered manner relative to the optical axis a of the light beam; and/or, at least one brightness adjusting lens 31 is used for being obliquely arranged relative to the optical axis A of the light beam emitted by the light source 1, and the axle center of the brightness adjusting lens 31 is used for being arranged in a dislocation way relative to the optical axis A of the light beam.

What needs to be explained is: when a circumferentially symmetric light beam irradiates the circumferentially symmetric optical element coaxially, the emergent light beam is still circumferentially symmetric, and when a circumferentially symmetric light beam irradiates the non-circumferentially symmetric optical element, the emergent light beam is distributed in a non-circumferentially symmetric manner.

Based on this, the inventors of the present disclosure found that: when a circumferentially symmetrical light beam is emitted to a circumferentially symmetrical lens, and the optical axis of the light beam deviates from the center of the lens, uneven brightness distribution can be realized on the image plane, and the area close to the optical axis is brighter and the area far from the optical axis is darker.

In addition, the inventors of the present disclosure also found that: when a circumferentially symmetrical light beam irradiates a circumferentially symmetrical lens, the optical axis of the light beam is arranged coaxially with the center of the lens, but when the lens is arranged obliquely with respect to the optical axis, the angle formed by the light beams at different positions on each luminous ring and the lens is different when the light beams irradiate the lens due to a certain divergence angle of the light beams, and the distances from the light source to the lens and from the lens to the phase surface are different, so that the circumferentially symmetrical characteristic is lost after the light beams pass through the oblique lens.

In the above-described solution, since the axis of the lens 42 and the center of the imaging chip 41 are not collinear in the direction of the optical axis a, there is a problem that the brightness of the projected image is uneven. Through set up luminance adjustment module 3 between dodging subassembly 2 and imaging module 4, and this luminance adjustment module 3 includes two at least luminance adjustment lenses 31, through carrying out the slope setting for optical axis A and/or make axle center and optical axis A dislocation arrangement with luminance adjustment lens 31 to can make the light that passes through luminance adjustment lens 31 be non-circumference symmetric distribution, that is, the light that goes out exists the region that luminance is strong and the region that luminance is weak. Because the light incident side of the imaging chip 41 is located at the light emergent side of the brightness adjusting module 3, the brightness adjusting lens 31 can be inclined (inclined relative to the optical axis a) and/or arranged off-axis (staggered relative to the optical axis a), so that more light is emitted to the area with weak brightness of the projection picture corresponding to the imaging chip 41, and less light is emitted to the area with strong brightness of the projection picture corresponding to the imaging chip 41, thereby realizing the uniformity of the brightness of the projection picture.

The present disclosure is not limited to this, and may be configured to be two, three, four, or the like, as to the number of the above-described brightness adjustment lenses 31.

In addition, in the case where at least two brightness adjusting lenses 31 are inclined with respect to the optical axis a, the brightness adjusting lenses 31 having different positions in the optical path may be inclined at the same angle or may be inclined at different angles, which is not limited in the present disclosure. And/or, when at least two brightness adjusting lenses 31 are disposed off-axis with respect to the optical axis a, the axes of the brightness adjusting lenses 31 with different positions in the optical path may be located on the same side of the optical axis a or may be located on different sides of the optical axis a, and the axes of the brightness adjusting lenses 31 with different positions in the optical path may be the same or may be different from the optical axis a in size.

In one embodiment, referring to fig. 1, the brightness adjustment module 3 includes a first brightness adjustment lens 301 and a second brightness adjustment lens 302, and the second brightness adjustment lens 302 is located on the light-emitting side of the first brightness adjustment lens 301. The first brightness adjustment lens 301 is disposed obliquely with respect to the optical axis a, and the second axis of the second brightness adjustment lens 302 is disposed offset from the optical axis a. Wherein the second axis of the second brightness adjustment lens 302 may be located on either side of the optical axis a.

In another embodiment, referring to fig. 2, the brightness adjustment module 3 includes a first brightness adjustment lens 301 and a second brightness adjustment lens 302, and the second brightness adjustment lens 302 is located on the light emitting side of the first brightness adjustment lens 301. The first axis of the first brightness adjusting lens 301 is offset from the optical axis a, and the first axis may be located on any side of the optical axis a, and the second brightness adjusting lens 302 is disposed obliquely with respect to the optical axis a.

In other embodiments, referring to fig. 3, the brightness adjustment module 3 includes a first brightness adjustment lens 301 and a second brightness adjustment lens 302, and the second brightness adjustment lens 302 is located on the light-emitting side of the first brightness adjustment lens 301. The first brightness adjusting lens 301 is disposed obliquely with respect to the optical axis a and has a first axis offset from the optical axis a, the first axis may be located on either side of the optical axis a, and the second brightness adjusting lens 302 is disposed perpendicularly to the optical axis and has a second axis located on the optical axis a. That is, the first brightness adjusting lens 301 is disposed both obliquely and off-axis, while the second brightness adjusting lens 302 is normally disposed neither obliquely nor off-axis.

Alternatively, referring to fig. 4, the brightness adjustment module 3 includes a first brightness adjustment lens 301 and a second brightness adjustment lens 302, and the second brightness adjustment lens 302 is located on the light-emitting side of the first brightness adjustment lens 301. Wherein the first brightness adjusting lens 301 is arranged perpendicular to the optical axis a and has a first axial center on the optical axis a, the second brightness adjusting lens 302 is arranged obliquely with respect to the optical axis a and has a second axial center offset from the optical axis a, which may be located on either side of the optical axis a. That is, while the first brightness adjusting lens 301 is normally disposed, it is neither tilted nor off-axis, the second brightness adjusting lens 302 is disposed both obliquely and off-axis.

Alternatively, referring to fig. 5, the brightness adjustment module 3 includes a first brightness adjustment lens 301 and a second brightness adjustment lens 302, and the second brightness adjustment lens 302 is located on the light-emitting side of the first brightness adjustment lens 301. The first brightness adjustment lens 301 and the second brightness adjustment lens 302 are parallel to each other, and the first brightness adjustment lens 301 and the second brightness adjustment lens 302 are inclined by a first angle with respect to the optical axis a; the first axis of the first brightness adjusting lens 301 and the second axis of the second brightness adjusting lens 302 are located on the same side of the optical axis a, and the distance between the first axis and the optical axis a and the distance between the second axis and the optical axis a are both the first size.

In other embodiments (not shown), the brightness adjustment module includes a first brightness adjustment lens and a second brightness adjustment lens, the second brightness adjustment lens being located on the light-emitting side of the first brightness adjustment lens. The first brightness adjusting lens and the second brightness adjusting lens are obliquely arranged on the optical axis, the inclination angles of the first brightness adjusting lens and the second brightness adjusting lens are different, the first axis of the first brightness adjusting lens and the second axis of the second brightness adjusting lens are located on the same side or different sides of the optical axis, and the distance between the first axis and the optical axis is unequal to the distance between the second axis and the optical axis.

Referring to fig. 6, the brightness adjustment module 3 is provided with a first brightness adjustment lens 301, a second brightness adjustment lens 302, and a third brightness adjustment lens 303 in order along the optical path direction. The first brightness adjusting lens 301 and the second brightness adjusting lens 302 are inclined at a first angle and parallel to each other, and the first axis of the first brightness adjusting lens 301 and the second axis of the second brightness adjusting lens 302 are located on the same side of the optical axis a and are both at a first size from the optical axis a. The third brightness adjustment lens 303 is inclined with respect to the optical axis by a second angle, which may be greater than the first angle, which is not limited by the present disclosure. In addition, the third axis of the third brightness adjusting lens 303 is located on the same side of the optical axis a as the first axis, and the distance between the third axis and the optical axis a is a second size, and the second size may be larger than the first size. Alternatively, in another embodiment (not shown), the first brightness adjusting lens, the second brightness adjusting lens and the third brightness adjusting lens are all disposed obliquely to the optical axis, and the inclination angles are different or identical, the first axis, the second axis and the third axis are all disposed off-axis, and the distance between the first axis and the optical axis, the distance between the second axis and the optical axis, and the distance between the third axis and the optical axis are different or identical.

In one embodiment (not shown), the brightness adjustment module includes three brightness adjustment lenses, wherein two brightness adjustment lenses are disposed obliquely with respect to the optical axis, and the inclination angles may be the same or different, and the axis of the other brightness adjustment lens is disposed offset from the optical axis.

In another embodiment (not shown), the brightness adjustment module includes three brightness adjustment lenses, wherein the axes of the two brightness adjustment lenses are offset from the optical axis and located on the same side or different sides of the optical axis, and the distances between the axes of the two brightness adjustment lenses and the optical axis may be the same or different. The other brightness adjusting lens is disposed obliquely with respect to the optical axis.

Alternatively, in another variant (not shown), the brightness adjustment module includes three brightness adjustment lenses, where two brightness adjustment lenses are tilted and off-axis, and the tilt amounts with respect to the optical axis may be the same or different, and the off-axis amounts may be the same or different, and the axes of the two brightness adjustment lenses may be on the same side or different sides of the optical axis, which is not limited in this disclosure. The other brightness adjusting lens is obliquely arranged relative to the optical axis, and the inclination angle can be the same as or different from the inclination angle of the other two brightness adjusting lenses. Or, the other brightness adjusting lens is arranged off-axis, the axle center can be positioned on the same side or different sides of the optical axis with the axle centers of the other two brightness adjusting lenses, and the distance between the axle center and the optical axis can be the same as or different from the distance between the axle centers of the other two brightness adjusting lenses and the optical axis.

In other variations (not shown), the brightness adjustment module includes three brightness adjustment lenses, one of which is tilted and off-axis, and the other two of which are tilted with respect to the optical axis. The tilt angles of the three brightness adjusting lenses with respect to the optical axis may be the same or different. Alternatively, the brightness adjustment module comprises three brightness adjustment lenses, wherein one brightness adjustment lens is inclined and off-axis, and the other two brightness adjustment lenses are arranged off-axis. The off-axis amounts of the three brightness adjusting lenses may be the same or different. Or, the brightness adjusting module comprises three brightness adjusting lenses, wherein one brightness adjusting lens is inclined and off-axis, the other brightness adjusting lens is inclined, the other brightness adjusting lens is off-axis, wherein the inclination angles can be the same or different, the off-axis amounts can be the same or different, and the disclosure is not limited to this.

Referring to fig. 1 to 6, the light equalizing assembly 2 includes a light spot shaping lens group 21 and a light equalizing element group 22, wherein the light incident side of the light spot shaping lens group 21 is located at the light emergent side of the light source 1, the light incident side of the light equalizing element group 22 is located at the light emergent side of the light spot shaping lens group 21, and the light incident side of the brightness adjusting module 3 is located at the light emergent side of the light equalizing element group 22.

In this embodiment, the spot shaping lens group 21 may include at least two spot shaping lenses 211, and the spot shaping lenses 211 can shape the spot of the light (adjust the cross-sectional spot shape), so as to redistribute or combine the light with different spaces and angles, and facilitate the elimination of speckle. The spot shaping lens 211 may be a convex lens or a concave lens as long as the purpose of shaping the spot can be achieved, and the type of lens of the spot shaping lens 211 is not limited in the present disclosure. The light homogenizing element group 22 can homogenize light to further improve the effect of resolving spots. The light homogenizing element group 22 may include any suitable light homogenizing element, which is not limited in this disclosure.

For example, referring to fig. 1 to 5, the light homogenizing element group 22 may include a first light homogenizing element 221, and the first light homogenizing element 221 is configured as a fly eye lens.

Alternatively, referring to fig. 6, the light homogenizing element group 22 includes a second light homogenizing element 222 and a third light homogenizing element 223, the light incident side of the second light homogenizing element 222 is located at the light emergent side of the spot shaping lens group 21, the light incident side of the third light homogenizing element 223 is located at the light emergent side of the second light homogenizing element 222, and the light incident side of the brightness adjusting module 3 is located at the light emergent side of the third light homogenizing element 223; wherein the second light homogenizing element 222 is configured as a diffuser wheel and the third light homogenizing element 223 is configured as a light bar.

Alternatively, referring to fig. 7, the fly-eye lens may include a plurality of unit lenses 2211, each unit lens 2211 including a first fly-eye 2212 and a second fly-eye 2213. The first compound eye 2212 and the second compound eye 2213 in the at least one unit lens 2211 are used for being obliquely arranged relative to the optical axis a of the light beam, and the inclination angle of the first compound eye 2212 relative to the optical axis a is the same as the inclination angle of the second compound eye 2213 relative to the optical axis a; and/or, the first axis a of the first compound eye 2212 in the at least one unit lens 2211 is not collinear with the second axis b of the second compound eye 2213.

That is, in this embodiment, the first fly's eye 2212 and the second fly's eye 2213 of the unit lens 2211 by tilting the same angle with respect to the optical axis a; and/or, the first axis a of the first fly's eye 2212 of the unit lens 2211 of the fly's eye lens and the second axis b of the second fly's eye 2213 are not collinear, and the design that the first axis a and the second axis b are not collinear may be understood as an off-axis arrangement. In other words, after the unit lens 2211 of the fly-eye lens is tilted and/or off-axis adjusted, the angular distribution of the light beam is asymmetric after passing through the fly-eye lens with such design, and one side is bright and the other side is dark. The light beam modulated in this way can also form the distribution of light intensity gradual transition, and the lens 42 used off-axis can also play a role in uniformly controlling the brightness of the projection picture. In general, by adjusting the unit lens 2211 of the fly-eye lens to tilt and/or off-axis, the fly-eye lens can perform brightness adjustment in addition to the function of homogenizing light, thereby realizing uniformity of brightness of the projection screen.

Referring to fig. 8, the projection light machine further includes a light machine housing 5, and the light homogenizing component 2 and the brightness adjusting module 3 are both disposed in the light machine housing 5; the brightness adjusting lens 31 is movably arranged in the optical machine housing 5 and is used for being inclined at different angles relative to the optical axis A; and/or the distance of the axis of the brightness adjusting lens 31 from the optical axis a is made different.

In this embodiment, the light homogenizing module 2 and the brightness adjusting module 3 are effectively protected by the light machine housing 5, and the brightness adjusting lens 31 is movably disposed in the light machine housing 5 to change the inclination angle and/or the off-axis amount of the brightness adjusting lens 31 relative to the optical axis a, so as to adjust the intensity distribution of the emergent light to meet different light intensity homogenization requirements.

For example, when the lens 42 is in the first position state, the upper area of the projected screen has low brightness and the lower area has high brightness, the upper area of the projected screen corresponds to the first area of the imaging chip 41, and the lower area of the projected screen corresponds to the second area of the imaging chip 41. By arranging the brightness adjusting module 3, and the brightness adjusting lens 31 of the brightness adjusting module 3 is movably arranged in the optical machine shell 5, the brightness adjusting lens 31 is adjusted to a first movement position, so that more light rays are emitted to a first region of the imaging chip 41, less light rays are emitted to a second region, and the brightness of the projected picture is homogenized.

When the lens 42 is in the second position state, the brightness of the left area of the projected image is low and the brightness of the right area of the projected image is high without the brightness adjustment module 3, the left area of the projected image corresponds to the third area of the imaging chip 41, and the right area of the projected image corresponds to the fourth area of the imaging chip 41. By arranging the brightness adjusting module 3, and the brightness adjusting lens 31 of the brightness adjusting module 3 is movably arranged in the optical machine shell 5, the brightness adjusting lens 31 is adjusted to the second movement position, so that more light rays are emitted to the third region of the imaging chip 41, less light rays are emitted to the fourth region, and the brightness of the projected picture is homogenized.

That is, by adjusting the position of the brightness adjusting lens 31, the tilt angle and/or the off-axis amount of the brightness adjusting lens 31 is changed to compensate for the uneven brightness caused by the difference in the relative positions of the lens 42 and the imaging chip 41.

Optionally, the brightness adjusting module 3 further includes a detection module (not shown), a control module (not shown), and a driving mechanism (not shown), where the detection module is electrically connected to the control module, and the control module is electrically connected to the driving mechanism. The detection module is used for detecting a first distance between a projection point of the axis of the lens 42 on the imaging chip 41 and the center of the imaging chip 41; the control module can be used to: the driving mechanism is controlled to drive the brightness adjusting lens 31 to move according to the first distance detected by the detection module.

In this embodiment, the first distance can be understood as the off-axis amount of the lens 42, and the control module controls the driving mechanism to drive the brightness adjusting lens 31 to move to different positions under the condition of different off-axis amounts of the lens 42, so as to meet different brightness compensation requirements under different positions of the lens 42.

In another embodiment, the brightness adjusting lenses 31 are provided in two and are the first brightness adjusting lens 301 and the second brightness adjusting lens 302, respectively, and the brightness adjusting module 3 further includes a rotation axis (not shown) and a movement axis (not shown). The rotating shaft is connected with the first brightness adjusting lens 301 and is rotatably connected with the optical machine housing 5 around an axis perpendicular to the optical axis a, and the moving shaft is connected with the second brightness adjusting lens 302 and is movably connected with the optical machine housing 5 along a direction perpendicular to the optical axis a. The driving mechanism comprises a first driving part (not shown) and a second driving part (not shown), and the first driving part and the second driving part are electrically connected with the control module; the first driving part can drive the rotating shaft to rotate around the axis vertical to the optical axis A, and the second driving part can drive the moving shaft to move along the direction vertical to the optical axis A.

In this embodiment, the first driving section drives the rotation shaft to rotate about an axis perpendicular to the optical axis a, so that the brightness adjusting lens 301 can be disposed obliquely with respect to the optical axis a; the second driving section drives the moving axis to move in a direction perpendicular to the optical axis a, so that the brightness adjusting lens 302 can be disposed off-axis. The first and second driving parts may be configured as any suitable driving structure, for example, the first driving part may be configured as a stepping motor and the second driving part may be configured as a linear motor, which is not limited in this disclosure.

Alternatively, the inclination angle of the brightness adjustment lens 31 with respect to the optical axis a is not less than 70 degrees and less than 90 degrees; and/or, the axis of the brightness adjusting lens 31 is arranged in a staggered manner relative to the optical axis a, and the maximum dimension of the brightness adjusting lens 31 in the direction perpendicular to the optical axis a is a third dimension, and the distance between the axis of the brightness adjusting lens 31 and the optical axis a is not more than one fifth of the third dimension, so that the quality of an imaging picture is prevented from being influenced. For example, the inclination angle of the brightness adjusting lens 31 with respect to the optical axis a may be 70 degrees, 80 degrees, 85 degrees, or the like. The distance between the axis of the brightness adjusting lens 31 and the optical axis a may be one sixth of the third dimension or one seventh of the third dimension, and the present disclosure is not limited thereto.

Referring to fig. 8 and 9, the projection light engine further includes a light engine housing 5, and a mounting groove 50 for mounting the brightness adjusting lens 31 is formed on the inner wall of the light engine housing 5; the mounting groove 50 enables the brightness adjustment lens 31 mounted thereon to be disposed obliquely with respect to the optical axis a; and/or the mounting groove 50 can be arranged so that the axial center of the brightness adjusting lens 31 mounted thereon is displaced with respect to the optical axis a. By providing the mounting groove 50, the installation of the brightness adjusting lens 31 is facilitated, and the stability of the brightness adjusting lens 31 is ensured.

For example, referring to fig. 8, the optical engine housing 5 includes a first optical engine housing 51, where two mounting grooves 50 are formed on the first optical engine housing 51, and the mounting groove 50 near the first light homogenizing element 221 can enable the brightness adjusting lens 31 placed therein to be normally arranged, not to be inclined or off-axis, and the other mounting groove 50 can enable the brightness adjusting lens 31 placed therein to be arranged off-axis, so that only one of the mounting grooves 50 can be selected for arrangement and installation when arrangement and installation are specifically performed.

Referring to fig. 9, the optical engine housing 5 further includes a second optical engine housing 52, and two mounting grooves 50 are formed in the second optical engine housing 52, and the two mounting grooves 50 are a first mounting groove 501 and a second mounting groove 502, respectively. The first mounting groove 501 and the second mounting groove 502 each enable the brightness adjustment lens 31 disposed therein to be tilted with respect to the optical axis a, the first mounting groove 501 being tilted at a larger angle with respect to the optical axis a, and the second mounting groove 502 being tilted at a smaller angle with respect to the optical axis a. In the arrangement and installation, only the first installation groove 501 or the second installation groove 502 may be selected. For example, when the first optical engine housing 51 is selected to be the mounting groove 50 near the first light homogenizing element 221, the second optical engine housing 52 may be selected to be the first mounting groove 501; alternatively, when the first optical housing 51 is selected from the mounting slots 50 far from the first light homogenizing element 221, the second optical housing 52 may be selected from the second mounting slots 502.

Referring to fig. 1 to 6, the imaging assembly 4 further includes a prism 40; the light incident surface 401 of the prism 40 is located at the light emitting side of the brightness adjusting module 3, the first light emitting surface 402 of the prism 40 is located at the light incident side of the imaging chip 41, and the second light emitting surface 403 of the prism 40 is located at the light incident side of the lens 42.

Prism 40 may include a TIR (Total Internal Reflection, total reflection) prism or a PBS (Polarization Beamsplitter, polarization splitting) prism, etc., although the specific type of prism 40 is not limited by the present disclosure.

The imaging chip 41 described above may be a DMD (Digital Micromirror Device, digital micromirror) chip or an LCD (Liquid Crystal Display, liquid crystal display technology) chip or an LCOS (Liquid Crystal on Silicon, digital imaging technology) chip, or the like, but the present disclosure is not limited to the specific type of the imaging chip 41.

The light source 1 may be one or a combination of a bulb light source, led light source, phosphor light source, and laser light source, which is not limited in this disclosure.

The projection engine further comprises a mirror (not shown); the light-in side of the reflector is positioned at the light-out side of the light homogenizing component 2, and the light-out side of the reflector is positioned at the light-in side of the brightness adjusting module 3; or the light-in side of the reflecting mirror is positioned on the light-out side of the brightness adjusting module 3, and the light-out side of the reflecting mirror is positioned on the light-in side of the imaging component 4; alternatively, the light incident side of the reflecting mirror is located on the light emitting side of one of the brightness adjusting lenses 31, and the light emitting side of the reflecting mirror is located on the light incident side of the other brightness adjusting lens 31. That is, the present disclosure does not limit the specific arrangement position of the reflecting mirror in the optical path, and the direction of the optical path may be changed as required.

The present disclosure further provides a projection device, which includes the projection light machine.

The foregoing is only examples of the present disclosure, and not the patent scope of the disclosure, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present disclosure or direct or indirect application in other related technical fields are included in the scope of the present disclosure.

Claims (15)

1. The projection optical machine is characterized by comprising a light source, a light homogenizing component, a brightness adjusting module and an imaging component which are sequentially arranged along the direction of an optical path, wherein the imaging component comprises an imaging chip and a lens;

the light incident side of the imaging chip is positioned at the light emergent side of the brightness adjusting module, the light incident side of the lens is positioned at the light emergent side of the imaging chip, and the axis of the lens and the center of the imaging chip are not collinear in the direction of the optical axis; the brightness adjusting module comprises at least two brightness adjusting lenses;

at least one of the brightness adjusting lenses is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and at least one other of the brightness adjusting lenses is used for being arranged in a staggered manner relative to the optical axis of the light beam;

And/or the number of the groups of groups,

at least one brightness adjusting lens is used for being obliquely arranged relative to the optical axis of the light beam emitted by the light source, and the axle center of the brightness adjusting lens is used for being arranged in a staggered mode relative to the optical axis of the light beam.

2. The projection light engine of claim 1, wherein at least two of the brightness adjusting lenses are used to tilt at the same or different angles with respect to the optical axis;

and/or the number of the groups of groups,

the axes of at least two brightness adjusting lenses are used for being positioned on the same side or different sides of the optical axis, and the axes of at least two brightness adjusting lenses are the same or different in size from the optical axis.

3. The projection light engine of claim 2, wherein the brightness adjustment module comprises a first brightness adjustment lens and a second brightness adjustment lens, the first brightness adjustment lens and the second brightness adjustment lens are parallel to each other, and the first brightness adjustment lens and the second brightness adjustment lens are inclined by a first angle with respect to an optical axis;

the first axis of the first brightness adjusting lens and the second axis of the second brightness adjusting lens are positioned on the same side of the optical axis, and the distance between the first axis and the optical axis and the distance between the second axis and the optical axis are both of a first size.

4. The projection light engine of claim 3, wherein the brightness adjustment module further comprises a third brightness adjustment lens, the third brightness adjustment lens is inclined at a second angle with respect to the optical axis, a third axis of the third brightness adjustment lens is located on a same side or a different side of the optical axis from the first axis, and a distance between the third axis and the optical axis is a second dimension.

5. The projection light engine of any one of claims 1-4, wherein the light homogenizing component comprises a spot shaping lens group and a light homogenizing element group, wherein an incident side of the spot shaping lens group is located at an emergent side of the light source, an incident side of the light homogenizing element group is located at an emergent side of the spot shaping lens group, and an incident side of the brightness adjusting module is located at an emergent side of the light homogenizing element group.

6. The projection light engine of claim 5, wherein the set of light homogenizing elements comprises a first light homogenizing element configured as a fly eye lens; or,

the light homogenizing element group comprises a second light homogenizing element and a third light homogenizing element, the light incident side of the second light homogenizing element is positioned at the light emergent side of the facula shaping lens group, the light incident side of the third light homogenizing element is positioned at the light emergent side of the second light homogenizing element, and the light incident side of the brightness adjusting module is positioned at the light emergent side of the third light homogenizing element; wherein the second light homogenizing element is configured as a diffusion wheel, and the third light homogenizing element is configured as a light rod.

7. The projection light engine of claim 6, wherein the fly-eye lens comprises a plurality of unit lenses, each of the unit lenses comprising a first fly-eye and a second fly-eye;

the first compound eye and the second compound eye in at least one unit lens are used for being obliquely arranged relative to the optical axis of the light beam, and the oblique angle of the first compound eye relative to the optical axis is the same as the oblique angle of the second compound eye relative to the optical axis; and/or the number of the groups of groups,

the first axis of the first fly's eye in at least one of the unit lenses is not collinear with the second axis of the second fly's eye.

8. The projection light engine of any one of claims 1-4, further comprising a light engine housing, wherein the light homogenizing assembly and the brightness adjustment module are both disposed within the light engine housing;

the brightness adjusting lens is movably arranged in the optical machine shell and used for being inclined at different angles relative to the optical axis; and/or, the distance between the axis of the brightness adjusting lens and the optical axis is different.

9. The projection light engine of claim 8, wherein the brightness adjustment module further comprises a detection module, a control module, and a driving mechanism, the detection module being electrically connected to the control module, the control module being electrically connected to the driving mechanism;

The detection module is used for detecting a first distance between a projection point of the axis of the lens on the imaging chip and the center of the imaging chip;

the control module can be configured to: and controlling the driving mechanism to drive the brightness adjusting lens to move according to the first distance detected by the detection module.

10. The projection light engine of claim 9, wherein the brightness adjusting lenses are two and are respectively a first brightness adjusting lens and a second brightness adjusting lens, and the brightness adjusting module further comprises a rotating shaft and a moving shaft;

the rotating shaft is connected with the first brightness adjusting lens and is rotatably connected with the optical machine shell around an axis perpendicular to the optical axis, and the moving shaft is connected with the second brightness adjusting lens and is movably connected with the optical machine shell along a direction perpendicular to the optical axis;

the driving mechanism comprises a first driving part and a second driving part, and the first driving part and the second driving part are electrically connected with the control module; the first driving part can drive the rotating shaft to rotate around an axis vertical to the optical axis, and the second driving part can drive the moving shaft to move along a direction vertical to the optical axis.

11. The projection light machine according to any one of claims 1 to 4, wherein an inclination angle of the brightness adjusting lens with respect to an optical axis is not less than 70 degrees and less than 90 degrees; and/or the axle center of the brightness adjusting lens is used for being arranged in a staggered way relative to the optical axis, the maximum size of the brightness adjusting lens in the direction perpendicular to the optical axis is a third size, and the distance between the axle center of the brightness adjusting lens and the optical axis is not more than one fifth of the third size.

12. The projection light engine as recited in any one of claims 1-4, further comprising a light engine housing, an inner wall of the light engine housing being formed with a mounting groove for mounting the brightness adjustment lens; the mounting groove enables the brightness adjusting lens mounted thereon to be obliquely arranged relative to the optical axis; and/or the mounting groove can enable the axle center of the brightness adjusting lens mounted on the mounting groove to be arranged in a staggered mode relative to the optical axis.

13. The projection light engine of any of claims 1-4, wherein the imaging assembly further comprises a prism; the light incident surface of the prism is positioned at the light emergent side of the brightness adjusting module, the first light emergent surface of the prism is positioned at the light incident side of the imaging chip, and the second light emergent surface of the prism is positioned at the light incident side of the lens.

14. The projection light engine of any of claims 1-4, further comprising a mirror;

the light incident side of the reflector is positioned at the light emergent side of the light homogenizing component, and the light emergent side of the reflector is positioned at the light incident side of the brightness adjusting module; or,

the light incident side of the reflecting mirror is positioned at the light emergent side of the brightness adjusting module, and the light emergent side of the reflecting mirror is positioned at the light incident side of the imaging component; or,

the light incident side of the reflecting mirror is positioned at the light emergent side of one brightness adjusting lens, and the light emergent side of the reflecting mirror is positioned at the light incident side of the other brightness adjusting lens.

15. A projection device, characterized in that it comprises a projection light engine as claimed in any one of claims 1-14.