CN116893556A

CN116893556A - Projection equipment and projection system

Info

Publication number: CN116893556A
Application number: CN202310723311.XA
Authority: CN
Inventors: 爱甲禛久; 王立国
Original assignee: Qingdao Hisense Laser Display Co Ltd
Current assignee: Qingdao Hisense Laser Display Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2023-10-17

Abstract

The invention discloses projection equipment and a projection system, which comprise a light modulation component and a projection lens, wherein the projection lens is arranged in a shell, the shell is provided with a mounting groove, and the light modulation component is arranged in the mounting groove of the shell. A certain gap is kept between at least one side inner wall of the mounting groove of the shell and the side wall of the mounting plate of the light modulation assembly. The position of the adjusting piece is adjusted to adjust the posture of the light modulation assembly in the mounting groove by arranging the adjusting piece in the gap, so that the display surface of the light modulator is positioned in the specification range of the back focal plane of the projection lens. And an adhesive layer is arranged between the adjusting piece and the inner wall of the mounting groove and between the adjusting piece and the side wall of the mounting plate, and can be a curing adhesive layer for mutually fixing the light modulation assembly, the adjusting piece and the shell. Therefore, the thickness of the curing adhesive layer can be reduced while the larger adjusting space of the optical modulation assembly is ensured, and the influence of the curing shrinkage stress of the curing adhesive layer on the installation position is reduced.

Description

Projection equipment and projection system

Technical Field

The present invention relates to the field of projection technologies, and in particular, to a projection apparatus and a projection system.

Background

Projection technology refers to that light is firstly irradiated onto an image display element to generate an image, and then the generated image is imaged through a projection lens. The ultra-short-focus projection equipment has the characteristics of small projection distance and large projection picture, and is very suitable for being applied to the household field.

The resolution of the projection device reflects the resolution and presentation capability of the details, and the higher the resolution is, the clearer the projected image and the finer the displayed image. The factor influencing the resolution of the projection device is above all the physical resolution, i.e. the image display elements in the projection device need to have a higher resolution, so that the projected image after imaging the display image of the image display elements also has a higher resolution. Second, the relative position between the projection lens and the image display element needs to be fixed.

At present, when fixing the position of the adjusted image display element, a specific fixing method is to fix the image display element by using ultraviolet curing glue, if the thickness of the ultraviolet curing glue needs to be increased in order to ensure a movable gap required in the adjustment process, the thickness of the ultraviolet curing glue increases to increase the curing shrinkage stress, and when the environment changes, the adjustment position is difficult to maintain, so that the relative position between the image display element and a projection lens is influenced to change, and the projection effect is deteriorated.

Disclosure of Invention

In a first aspect of an embodiment of the present invention, there is provided a projection apparatus including:

a housing;

a projection lens mounted in the housing;

a light modulation assembly including a light modulator and a mounting plate for mounting the light modulator; the shell comprises a mounting groove, the mounting plate is mounted in the mounting groove, and a gap is formed between at least one inner wall of the mounting groove and the side wall of the mounting plate; a kind of electronic device with high-pressure air-conditioning system

At least one adjustment member located in a gap between an inner wall of the mounting slot and a side wall of the mounting plate; the adjusting piece is used for adjusting the relative position of the mounting plate in the mounting groove; and an adhesive layer is arranged between the regulating part and the inner wall of the mounting groove and between the regulating part and the side wall of the mounting plate, and the adhesive layer is used for mutually fixing the light modulation component, the regulating part and the shell.

In some embodiments of the present invention, the adjusting member has a wedge structure, a side surface of the adjusting member facing the inner wall of the mounting groove is a first side surface, and a side surface of the adjusting member facing the side wall of the mounting plate of the light modulation component is a second side surface;

the first side surface and/or the second side surface inclined surface.

In some embodiments of the present invention, the adjusting member further includes a top surface and a bottom surface connecting both ends of the first side surface and the second side surface, the top surface and the bottom surface are disposed in parallel, and the inclined surface has an inclination angle of 5 ° to 30 ° with respect to a normal line of the top surface.

In some embodiments of the invention, a minimum thickness between the first side surface and the second side surface of the adjustment member is 2mm to 4mm.

In some embodiments of the invention, the projection device includes four adjusting members, and the four adjusting members are respectively located at four corners of the mounting plate of the light modulation assembly.

In some embodiments of the present invention, the adjustment range of the mounting plate along the direction parallel to the optical axis of the projection lens is ±1.5mm, and the adjustment range of the angle of the plane of the mounting plate relative to the optical axis of the projection lens is ±1.5 °.

In some embodiments of the present invention, the material of the adjusting member is glass or light-transmitting resin.

In some embodiments of the invention, the adhesive layer is a cured adhesive layer; the thickness of the cured adhesive layer meets the following conditions:

d×s≤p/2；

wherein d represents the thickness of the cured adhesive layer, s represents the curing shrinkage of the cured adhesive layer, and p represents the pitch of the pixels of the light modulator.

In some embodiments of the invention, the cured bondline has a thickness of less than 50 μm.

In some embodiments of the invention, the light modulation assembly further comprises a heat sink mounted to a side of the mounting plate opposite the light modulator;

the light modulator adopts liquid crystal on silicon or digital micromirror.

In some embodiments of the invention, the projection device further comprises:

a projection light source; a kind of electronic device with high-pressure air-conditioning system

An illumination light path positioned at the light-emitting side of the projection light source; the light modulation component is positioned on the light emitting side of the illumination light path.

In a second aspect of an embodiment of the present invention, there is provided a projection system including:

the projection equipment is any one of the projection equipment; the projection device is used for emitting projection light; a kind of electronic device with high-pressure air-conditioning system

And the projection screen is positioned at the light emitting side of the projection equipment and used for receiving the projection light emitted by the projection equipment to display a projection image.

Drawings

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

FIG. 1 is a schematic diagram of an imaging principle of a projection device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram illustrating a positional relationship between a projection lens and a light modulator according to an embodiment of the present invention;

FIG. 3 is a schematic diagram illustrating a tolerance of a display surface of an optical modulator according to an embodiment of the present invention;

FIG. 4 is a schematic diagram illustrating a tolerance of a back focal plane of a projection lens according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a light modulation assembly according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the overall structure of a projection device according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a partial structure of a projection apparatus according to an embodiment of the present invention;

FIG. 8 is a partial schematic view of the dashed box of FIG. 7 in another view;

FIG. 9 is a schematic diagram showing a second partial structure of a projection apparatus according to an embodiment of the present invention;

FIG. 10 is a schematic structural view of an adjusting member according to an embodiment of the present invention;

FIG. 11 is a schematic diagram illustrating a correspondence between a center point of a display surface and a center point of a projection screen according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of adjusting a position of a light modulating component according to an embodiment of the present invention;

FIG. 13 is a partial schematic view of the dashed box in FIG. 12;

fig. 14 is a schematic diagram of adjusting an inclination angle of a light modulation component according to an embodiment of the present invention;

FIG. 15 is a partial schematic view of the dashed box in FIG. 14;

fig. 16 is a schematic structural diagram of a projection system according to an embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention. The drawings of the present invention are merely schematic representations of relative positional relationships and are not intended to represent true proportions.

Projection technology refers to that light is firstly irradiated onto an image display element to generate an image, and then the generated image is imaged through a projection lens.

The ultra-short-focus projection equipment has the characteristics of small projection distance and large projection picture, and is very suitable for being applied to the household field.

The resolution of the projection device reflects the resolution and presentation capability of the details, and the higher the resolution, the clearer the projected image and the finer the image. The factor influencing the resolution of the projection device is first of all the physical resolution, i.e. the resolution of the image display elements in the projection device. The image display element is typically a light modulator in a projection device that can modulate incident light to produce an image. When the image display element has a higher resolution, an image with a higher resolution can be displayed, and a projection image obtained by imaging the display image of the image display element also has a higher resolution. Next, setting the display surface of the image display element within the back focus specification of the projection lens also affects the resolution of the entire image of the final projection image.

In order to position the image display element within the back focus specification range of the projection lens, it is necessary to adjust the position of the image display element and fix the adjusted position of the image display element. The specific fixing method is to fix the image display element by using ultraviolet curing glue, if the thickness of the ultraviolet curing glue needs to be increased in order to ensure the movable gap required in the adjustment process, the thickness of the ultraviolet curing glue increases to increase the curing shrinkage stress, and the adjustment position is difficult to maintain when the environment changes, so that the relative position between the image display element and the projection lens is influenced to change to cause the deterioration of the projection effect. Therefore, it is necessary to reduce the thickness of the ultraviolet curable adhesive in order to reduce the curing shrinkage stress while ensuring sufficient adhesive strength.

In view of this, embodiments of the present invention provide a projection apparatus that can reduce the thickness of an adhesive layer while maintaining a sufficiently adjustable gap, thereby ensuring long-term reliability of fixing accuracy and adhesive strength.

Fig. 1 is a schematic diagram of an imaging principle of a projection device according to an embodiment of the present invention.

As shown in fig. 1, a projection apparatus provided in an embodiment of the present invention includes: a projection light source 11, an illumination light path 12, a light modulator 131, and a projection lens 14. The illumination light path 12 is located at the light emitting side of the projection light source 11, the light modulator 131 is located at the light emitting side of the illumination light path 12, and the projection lens 14 is located at the light emitting side of the light modulator 131.

The projection light source 11 may be a light emitting diode (Light Emitting Diode, LED) light source or a laser light source. The LED light source has the advantages of small power consumption, small volume, long service life and the like, and is suitable for small-size projection and other application scenes. The laser light source has higher brightness and better color saturation, and can optimize the display effect of the projection image.

In the embodiment of the invention, the projection light source can adopt a laser light source, and the laser light source can adopt a monochromatic laser or a laser capable of emitting laser with various colors or a plurality of lasers emitting laser with different colors. When the laser light source adopts a monochromatic laser, the laser display device also needs to be provided with a color wheel which is used for color conversion, and the monochromatic laser can realize the purpose of emitting the primary color light of different colors according to time sequence by matching with the color wheel. When the laser light source adopts a laser capable of emitting laser light with multiple colors, the laser light source needs to be controlled to emit laser light with different colors as primary color light according to time sequence. The three-color laser light source is favorable for improving the color gamut of the projection image, has better color expressive force and can accurately reproduce the input image.

The illumination light path 12 is located on the light emitting side of the projection light source 11, and the illumination light path 12 collimates the light emitted from the projection light source 11 on the one hand, and allows the light emitted from the projection light source 11 to enter the light modulator 131 at an appropriate angle on the other hand. The illumination path 12 may include a plurality of lenses or lens groups, and is not limited herein.

The light modulator 131 is used to modulate incident light to form an image. In the embodiment, the light modulator 131 may be a transmissive light modulator or a reflective light modulator. The light modulator 131 shown in fig. 1 is a reflective light modulator. The reflective optical modulator receives the incident light beam after the polarization control by the polarization separation element P, modulates the incident light beam, and reflects the modulated light beam. Since the optical path is folded back through the reflective light modulator, the volume of the projection apparatus can be reduced.

In an embodiment of the present invention, the optical modulator 131 may be a reflective optical modulator, for example, the optical modulator 13 may be a liquid crystal on silicon (Liquid Crystal on Silicon, abbreviated as LCoS) or a digital micromirror (Digital Micromirror Device, abbreviated as DMD).

LCoS is formed by bonding a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, abbreviated as CMOS) substrate to a glass substrate containing transparent electrodes based on semiconductor technology, and then injecting liquid crystal for encapsulation. LCoS has the characteristics of high aperture ratio of each pixel, high resolution and the like, and can form a high-resolution image.

The DMD includes a plurality of minute mirrors, each of which is individually driven to deflect, and the brightness of light incident on the projection lens 14 is controlled by controlling the deflection angle of the DMD.

After the light modulator 131 modulates the incident light to form an image, the light is reflected toward the projection lens and imaged by the projection lens 14, thereby projecting the image to a proper size for viewing.

Fig. 2 is a schematic diagram of a positional relationship between a projection lens and a light modulator according to an embodiment of the present invention, fig. 3 is a schematic diagram of a tolerance of a display surface of the light modulator according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a tolerance of a back focal surface of the projection lens according to an embodiment of the present invention.

As shown in fig. 2, the distance from the lens of the projection lens to the back focal plane b is the back focal distance BF, and when designing the projection apparatus, the display surface d of the light modulator 131 needs to be set within the specification of the back focal plane b of the projection lens 14, otherwise, focusing is not possible. Ideally, the display surface d of the light modulator 131 coincides with the back focal surface b of the projection lens 14, so that the clearest imaging can be obtained.

As shown in fig. 3 and 4, there is a case where the tolerance of the display surface d of the light modulator 131 is larger than the tolerance of the back focal surface b of the projection lens 14 during processing and mounting. As a specific example, as shown in fig. 3, the tolerance of the display surface d of the optical modulator 131 with respect to the reference surface a is generally ±0.5°; as shown in fig. 4, the tolerance of the back focal plane b of the projection lens 14 is typically only ±0.067°, ±50 μm. If not, the display surface d of the light modulator 131 may exceed the specification range of the back focal plane b of the projection lens 14, resulting in degradation of the imaging quality and affecting the quality of the projection image.

In order to obtain a good imaging effect, an object of the embodiment of the present invention is to adjust the display surface d of the light modulator 131 to be within the specification range of the back focal plane b of the projection lens 14 and to maintain the position of the light modulator 131.

Fig. 5 is a schematic structural diagram of a light modulation component according to an embodiment of the present invention.

In some embodiments, when installing the optical elements of the projection device, some of the elements may be integrated in terms of function, and the integrated functions may be assembled. For example, as shown in fig. 5, the light modulator 131 is typically mounted on a mounting board 132, and a heat sink (not shown in the figure) is provided on the opposite side of the mounting board 132 from the light modulator 131, and the light modulator 131, the mounting board 132, and the heat sink are integrated as the light modulation module 13.

In an embodiment of the present invention, the projection device further includes a housing for mounting the optical engine of the projection device, wherein the housing is shaped to conform to the optical path of each element in the projection device, and each element of the projection device is mounted at a corresponding position by providing a mounting position inside the housing so as to maintain the relative positional relationship between each element.

Fig. 6 is a schematic diagram of the overall structure of a projection device according to an embodiment of the present invention.

As shown in fig. 6, when the projection apparatus is assembled, the housing 10 may be provided, and the housing 10 has a hollow structure, inside which light may be transmitted. The projection lens 14 may be installed in the housing 10, and a mounting groove a is provided on the housing for mounting the light modulation component 13, where the shape of the mounting groove a is the same as the shape of the mounting plate 132 in the light modulation component, and the mounting of the light modulation component 13 and the housing is achieved by mounting the mounting plate 132 in the mounting groove a. The light modulator 131 is installed facing the bottom side of the installation groove a, and the heat sink 133 is installed facing the side of the opening of the installation groove a, so that the modulated light emitted from the light modulator 131 can be incident from the inside of the housing 10 to the projection lens 14 for imaging.

Fig. 7 is a schematic diagram of a partial structure of a projection apparatus according to an embodiment of the present invention, and fig. 8 is a schematic diagram of a partial structure of a dashed box in fig. 7 at another view angle.

As shown in fig. 7, in order to mount the light modulation module 13, the housing 10 includes a mounting groove a recessed toward the projection lens 14 side, the light modulation module 13 is mounted in the mounting groove a with a gap k between at least one inner wall of the mounting groove a and a side wall of the mounting plate 132 of the light modulation module.

Specifically, the bottom surface of the mounting groove a formed by the housing 10 is hollowed, and the display surface of the light modulator 131 faces the projection lens 14, so that the light emitted by the light modulator 131 can be incident on the projection lens 14 through the hollowed. The gap k between the inner wall of the mounting groove a and the mounting plate 132 of the light modulation assembly provides enough movable space for the light modulation mounting plate 132, thereby driving the display surface of the light modulator 131 to adjust the distance and angle relative to the projection lens.

As shown in fig. 7 and 8, in the embodiment of the present invention, the adjusting member x is disposed in the gap k between the inner wall of the mounting groove a and the side wall of the mounting plate 132, and the posture of the mounting plate 132 in the mounting groove a can be adjusted by adjusting the relative position of the adjusting member x, so that the distance between the display surface of the light modulator 131 and the projection lens and the angle of the display surface of the light modulator 131 relative to the optical axis of the projection lens can be changed, and the display surface d of the light modulator 131 can be adjusted to be positioned within the specification of the back focal plane b of the projection lens 14, so as to achieve a better imaging effect.

Fig. 9 is a schematic diagram of a partial structure of a projection apparatus according to an embodiment of the invention.

As shown in fig. 9, an adhesive layer u is provided between the regulating member x and the inner wall of the mounting groove a and between the regulating member x and the side wall of the mounting plate 132, and the adhesive layer u is used to fix the light modulation module 13, the regulating member x, and the housing 10 to each other.

In the embodiment of the present invention, the adhesive layer u may be a cured adhesive layer, and the cured adhesive layer may be a photo-cured adhesive or a thermosetting adhesive, which is not limited herein. In addition, the adhesive layer u may be made of other adhesive materials having an adhesive function, as long as the adhesive materials can fix the light modulation element 13, the adjusting member x, and the housing 10 to each other, and the adhesive materials are not limited thereto.

The embodiment of the invention is specifically described by taking ultraviolet curing glue as an example of an adhesive layer. As shown in fig. 9, the ultraviolet curing glue is coated on the two side surfaces of the adjusting member x, and the position and angle of the mounting plate are adjusted by adjusting the position of the adjusting member x, so as to drive the light modulator to be adjusted to the optimal position within the back focus specification of the projection lens. After the position of the pattern plate 132 is determined, the position of the regulating member x is maintained by a jig or a spring or the like, and the ultraviolet curable adhesive (adhesive layer u) is cured by irradiation of the ultraviolet device 20.

In order to provide the light modulation module 13 with a sufficient movable space in the mounting groove a of the housing 10, it is necessary to maintain a constant gap k between the mounting groove a and the periphery of the mounting plate 132. When the adjusting member x is not used, the ultraviolet curing glue needs to be filled in the gaps at the four corners between the mounting plate 132 and the mounting groove a for fixing, so that the thickness of the filled ultraviolet curing glue is large, and large curing shrinkage stress is generated in the curing process of the ultraviolet curing glue, so that it is difficult to keep the adjusted position of the light modulator 131 unchanged with high precision. According to the embodiment of the invention, the adjusting piece x is arranged in the gap between the mounting groove A and the mounting plate 132, so that the thickness of the ultraviolet curing adhesive can be reduced while the larger adjusting space of the light modulation assembly 13 is ensured, the curing shrinkage stress of the ultraviolet curing adhesive is reduced, the influence of environmental change on the ultraviolet curing adhesive is reduced, and the position of the light modulator 131 after adjustment can be kept unchanged with high precision.

The material of the adjusting piece x adopts light-transmitting materials such as glass or light-transmitting resin, and has better penetrability to ultraviolet light. The light-transmitting material is adopted for the adjusting piece x, so that the influence on the bonding strength of the ultraviolet curing adhesive caused by shielding ultraviolet rays to form shadows when the ultraviolet curing adhesive is cured can be avoided.

In the embodiment of the invention, when the adhesive layer adopts a cured adhesive layer, the thickness of the adhesive layer is as follows:

d×s≤p/2；

where d represents the thickness of the cured bondline, s represents the cure shrinkage of the cured bondline, and p represents the pitch of the pixels of the light modulator.

The curing adhesive generates curing shrinkage stress in the curing process, so that the position of the pulling light modulation assembly moves. In order to avoid the influence of the curing shrinkage stress of the curing adhesive on the adjusting position, the embodiment of the invention can control the thickness of the curing adhesive layer to be reduced to a position variation caused by the shrinkage stress of the curing adhesive layer below half a pixel interval, and can ignore the influence caused by the displacement of the curing adhesive layer.

For example, the curing shrinkage of the cured adhesive is 4%, and when the thickness of the cured adhesive is 1mm, the cured adhesive itself shrinks by 40 μm due to the curing shrinkage. When the thickness of the cured paste is 50. Mu.m, shrinkage of 2. Mu.m occurs. When the pixel pitch is 4 μm to 5 μm, it is preferable that the shrinkage of the cured paste is suppressed to less than half the pixel pitch to neglect the influence of the positional change due to the curing stress, and the thickness of the cured paste should be less than 50 μm.

According to the embodiment of the invention, the thickness of the curing adhesive can be reduced by arranging the adjusting piece, so that the influence of shrinkage stress of the curing adhesive on the position of the optical modulator is avoided, the optical modulator is kept to be positioned in the back focal specification of the projection lens, and the optimal resolution of the projection equipment is achieved.

In some embodiments, as shown in fig. 7, where there is a gap k between the peripheral side wall of the mounting plate 132 of the light modulation assembly and the four inner walls of the mounting groove a, four adjusting members x may be disposed at four corners of the mounting plate 132. The adjusting piece x has two opposite surfaces facing the inner wall of the installation groove a and the side wall of the installation plate 132 respectively, and the corner positions of the two ends of the side wall of the installation plate 132 are respectively contacted with one adjusting piece x, and the adjusting piece x is contacted with the inner wall of the installation groove a, so that the installation plate 132 is clamped on the inner wall of the installation groove a through the four adjusting pieces x.

Fig. 10 is a schematic structural view of an adjusting member according to an embodiment of the present invention.

As shown in fig. 8 and 10, a side surface of the adjusting member x facing the inner wall of the mounting groove a is referred to as a first side surface s1, a side surface of the adjusting member x facing the side wall of the mounting plate 132 is referred to as a second side surface s2, and the adjusting member x further includes a top surface s3 and a bottom surface s4 connecting both ends of the respective side surfaces. In the embodiment of the present invention, at least one of the first side surface s1 and the second side surface s2 is an inclined surface, and the top surface s3 and the bottom surface s4 are disposed in parallel.

The width of the regulating member x gradually decreases in a direction (a direction indicated by an arrow in fig. 10) near the bottom of the mounting groove of the housing 10, and has a wedge-shaped structure as a whole. In the embodiment of the present invention, the gap width between the installation groove a and the installation plate 132 is 2mm to 4mm, and the depth of the installation groove a is greater than the height of the adjusting member x. Accordingly, the minimum width of the adjusting member x, i.e., the bottom side width d1 in fig. 10, may be 2mm to 4mm, so that the adjusting member x may have a sufficient moving space.

According to the adjustment range of the light modulator 131, the inclination angle θ of the inclined surface in the adjustment member x, which affects the maximum width of the adjustment member, i.e., the value of the top width d2 in fig. 10, and also affects the adjustment amount of the adjustment member x, may be set to 5 ° to 30 °. For example, when the height of the regulating member is 8mm, the bottom width d1=3 mm, and the inclination angle θ=15° of the inclined surface, the top width d2=d1+8×tan θ=5.07 mm of the regulating member. And when the inclination angle θ=5° of the inclined surface, the top width d2=3.7 mm of the regulating member. Therefore, the value of the inclination angle θ of the inclined surface of the adjusting member x can change the width change degree and the overall width of the adjusting member x, the parameters of the adjusting member x need to be set according to the movable range of the light modulator 131, and the setting of the parameters of the width, the height, the inclination angle and the like of the adjusting member x also needs to take into consideration the assembly tolerance, and has a larger adjusting range than the theoretical value.

In the embodiment of the present invention, the tolerance of the back focal plane b of the projection lens 14 may be ±0.067°, ±50 μm. The adjustment range of the light modulation component 13 at least covers the tolerance of the back focal plane of the projection lens, and the adjustment range of the mounting plate 132 along the direction parallel to the optical axis of the projection lens, that is, the adjustment range of the light modulator 131 along the focal length direction of the projection lens is + -1.5 mm, taking the tolerance of each component into consideration; the adjustment range of the angle of the plane of the mounting plate 132 relative to the optical axis of the projection lens, that is, the adjustment angle of the display surface of the light modulator 131 relative to the optical axis of the projection lens is ±1.5°. The range of motion of the mounting plate is correspondingly enlarged so that the light modulator 131 can be adjusted to an optimal position.

In particular, the width of the mounting plate 132 is fixed, and when the adjustment member x moves up and down in the depth direction of the mounting groove a (the arrow direction in fig. 8), the mounting plate 132 is only locked at a position between the adjustment members x which corresponds to the width of the mounting plate 132, and therefore, by adjusting the position of the adjustment member x, the distance between the mounting plate 132 and the bottom of the mounting groove a can be changed, and thus, the distance between the display surface d of the light modulator 131 and the projection lens 14 can be adjusted. At the same time, the inclination angle of the mounting plate 132 can be adjusted by adjusting the positions of the adjusting members x on both sides, so that the angle of the display surface d of the light modulator 131 with respect to the optical axis of the projection lens 14 can also be adjusted.

Fig. 11 is a schematic diagram of a correspondence between a center point of a display surface and a center point of a projection screen according to an embodiment of the present invention.

Specifically, as shown in fig. 11, the light rays projected by the projection apparatus 1 may form a projection screen at a position of a certain distance, the center point of the projection screen being O2. In an ideal case, the center point O1 of the display surface of the light modulator coincides with the center point O2 of the projection screen after imaging by the projection lens, so that the imaging effect of each position of the display surface can be balanced.

According to the embodiment of the invention, the display surface of the light modulator can be positioned in the specification of the back focal plane b of the projection lens by adjusting the position of the adjusting piece x, so that the center point O1 of the display surface is overlapped with the center point O2 of the projection picture after being imaged by the projection lens.

Four adjusting members x are provided on both sides of the mounting plate 32, and by adjusting the positions of the four adjusting members x, the mounting plate 32 can be adjusted in both dimensions of a distance from the projection lens and an inclination angle with respect to the optical axis of the projection lens.

FIG. 12 is a schematic diagram of adjusting a position of a light modulating component according to an embodiment of the present invention; fig. 13 is a schematic view of a partial structure of the dashed box in fig. 12. Fig. 14 is a schematic diagram of adjusting an inclination angle of a light modulation component according to an embodiment of the present invention; fig. 15 is a schematic view of a partial structure of the dashed box in fig. 14. Wherein the arrow direction in fig. 12 illustrates the distance direction of the light modulation element 13 with respect to the projection lens, and the arrow direction in fig. 14 illustrates the tilt direction of the light modulation element 13 with respect to the optical axis of the projection lens.

As shown in fig. 12 and 13, when the distance between the mounting plate 132 of the light modulation module and the bottom of the mounting groove a of the housing 10, that is, the distance between the display surface of the light modulator and the projection lens is adjusted, the engagement position of the mounting plate 132 in the mounting groove a can be changed by adjusting the relative positions of the adjusting members x on both sides of the mounting plate 132 in the gaps on both sides. When the mounting plate 132 is adjusted in its position in the direction of the arrow in fig. 12, the depth of the adjustment member x on both sides in the gap is not generally greatly different as shown in fig. 13. For example, when the regulating members x on both sides are moved upward at the same time, the mounting plate 132 may be caught at a position closer to the bottom of the mounting groove a, thereby reducing the distance between the light modulator and the projection lens; when the regulating members x on both sides are simultaneously moved downward, the mounting plate 132 can be caught at a position farther from the bottom of the mounting groove a, thereby increasing the distance between the light modulator and the projection lens.

As shown in fig. 14 and 15, when the inclination angle of the mounting plate 132 of the light modulation assembly, that is, the inclination angle of the display surface of the light modulator with respect to the optical axis of the projection lens is adjusted, the locking positions of the two sides of the mounting plate 132 are not on the same plane by adjusting the relative positions of the adjusting members x on the two sides of the mounting plate 132 in the gaps on the two sides, so that the mounting plate 132 drives the light modulator to incline in different directions. When the mounting plate 132 is made to adjust its inclination angle in the arrow direction in fig. 14, the depth of the adjustment members x on both sides in the gap is generally large in difference as shown in fig. 15. For example, when the difference in the up-down positions of the regulating members x on both sides in the gap is large, the inclination angle of the mounting plate 132 is larger; the inclination angle of the mounting plate 132 is smaller when the difference in the up-down positions of the regulating members x on both sides in the gap is smaller.

The above only exemplifies one possible implementation of adjusting the position of the light modulation component 13 by the adjusting member x, and in practical application, the position of the adjusting member x may be flexibly adjusted according to the individual projection lens, and the adjusting manner and the rules followed in the adjusting process are not limited herein.

Based on the same inventive concept, an embodiment of the present invention further provides a projection system, and fig. 16 is a schematic structural diagram of the projection system provided by the embodiment of the present invention.

As shown in fig. 16, the projection system includes a projection device 1 and a projection screen 2. The projection device 1 may employ any of the above projection devices including a projection light source, an illumination light path, a light modulator, and a projection lens. The light modulator is installed on the mounting plate, the radiator is installed to the opposite side of mounting plate, comprises light modulator, mounting plate and radiator and constitutes the light modulation subassembly, sets up the casing in the projection equipment to install projection lens in the casing. The housing is provided with a mounting groove, and the light modulation assembly is mounted in the mounting groove of the housing. A certain gap is kept between at least one side inner wall of the mounting groove of the shell and the side wall of the mounting plate of the light modulation assembly. The adjusting piece is arranged in the gap, and the posture of the light modulation assembly in the mounting groove is adjusted by adjusting the position of the adjusting piece, so that the display surface of the light modulator is positioned in the specification range of the back focal plane of the projection lens. And an adhesive layer is arranged between the adjusting piece and the inner wall of the mounting groove and between the adjusting piece and the side wall of the mounting plate, and can be a curing adhesive layer for mutually fixing the light modulation assembly, the adjusting piece and the shell. Therefore, the thickness of the curing adhesive layer can be reduced while the larger adjusting space of the light modulation assembly is ensured, the influence of the curing shrinkage stress of the curing adhesive layer on the installation position is reduced, the influence of environmental change on the curing adhesive layer is reduced, and the position of the light modulation assembly after adjustment is kept unchanged.

The projection device 1 is used for emitting projection light, and the projection screen 2 is positioned on the light emitting side of the projection device 1 and used for receiving the projection light emitted by the projection device to display a projection image. The use of the projection device 1 in combination with the projection screen 2 improves the contrast of the projected image by allowing a greater gain to be achieved. The projection screen adopted by the prior front projection system is provided with a Fresnel structure layer, the surface of the Fresnel structure layer is provided with a reflecting layer, and the Fresnel structure in the Fresnel structure layer can enable light rays emitted by the projection device 1 to be incident on the reflecting layer on the surface of the Fresnel structure layer, so that the light rays are reflected to the position where a spectator is located, and the projection light rays are incident on human eyes to watch projection images.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A projection device, comprising:

a housing;

a projection lens mounted in the housing;

2. The projection apparatus of claim 1, wherein the adjustment member is a wedge-shaped structure, a side surface of the adjustment member facing an inner wall of the mounting groove is a first side surface, and a side surface of the adjustment member facing a side wall of the mounting plate of the light modulation assembly is a second side surface;

the first side surface and/or the second side surface is an inclined surface.

3. The projection apparatus according to claim 2, wherein the regulating member further comprises a top surface and a bottom surface connecting both ends of the first side surface and the second side surface, the top surface and the bottom surface being disposed in parallel, the inclined surface being inclined at an angle of 5 ° to 30 ° with respect to a normal line of the top surface.

4. A projection device as claimed in claim 3, wherein a minimum thickness between the first side surface and the second side surface of the adjustment member is 2mm to 4mm.

5. The projection device of any of claims 2-4, wherein the projection device comprises four of the adjustment members, each of the four adjustment members being positioned at a four-corner location of a mounting plate of the light modulation assembly.

6. The projection apparatus according to claim 5, wherein the adjustment range of the mounting plate in a direction parallel to the optical axis of the projection lens is ±1.5mm, and the adjustment range of the angle of the plane in which the mounting plate lies with respect to the optical axis of the projection lens is ±1.5 °.

7. The projection apparatus according to any one of claims 1 to 4, wherein the material of the regulating member is glass or light-transmitting resin.

8. The projection device of claim 7, wherein the adhesive layer is a cured bondline; the thickness of the cured adhesive layer meets the following conditions:

d, the thickness s is less than or equal to the thickness is full;

9. The projection device of any of claims 1-4, wherein the light modulation assembly further comprises a heat sink mounted to a side of the mounting plate opposite the light modulator;

the optical modulator adopts liquid crystal on silicon or a digital micromirror;

the projection apparatus further includes:

10. A projection system, comprising:

a projection device as claimed in any one of claims 1 to 9; the projection device is used for emitting projection light; a kind of electronic device with high-pressure air-conditioning system