CN113835290A

CN113835290A - Lens assembly of projection equipment and projection equipment

Info

Publication number: CN113835290A
Application number: CN202010513767.XA
Authority: CN
Inventors: 张敬飞; 谢振霖
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2021-12-24

Abstract

The application provides projection equipment's camera lens subassembly and projection equipment, wherein, projection equipment includes luminous component, reflection bowl and a plurality of speculum, forms first transmission route and second transmission route between luminous component and the reflection bowl, along the thickness direction of camera lens subassembly, has predetermined distance between the position of second transmission route and the position of first transmission route, and two at least speculums among a plurality of speculums set up between first transmission route and second transmission route, just have predetermined contained angle between the mirror surface of each speculum in two at least speculums to make light from first transmission route reflected to second transmission route. Through such design can promote the position that sets up of reflection bowl, reduce the difference in height between reflection bowl and the first transmission route, can reduce the thickness of lens subassembly to can reduce projection equipment's volume.

Description

Lens assembly of projection equipment and projection equipment

Technical Field

The application relates to the technical field of electronic equipment, in particular to a lens assembly of projection equipment and the projection equipment.

Background

With the development of technology, projection devices (such as laser televisions and the like) have gradually replaced traditional televisions and become video devices commonly used in people's life, and since the projection devices such as laser televisions and the like present images on a screen in a diffuse reflection imaging mode through a reflection bowl, however, in order to reflect light to the screen, the reflection bowl needs to be arranged at a lower position, which results in that the space occupied by a lens is larger along the thickness direction of the laser television, and the volume of the projection devices such as laser televisions and the like becomes larger.

Disclosure of Invention

The application provides a projection equipment's camera lens subassembly and projection equipment for solve the great problem of projection equipment's camera lens subassembly occupation space among the prior art.

In a first aspect, the present application provides a lens assembly, the lens assembly includes a light emitting component, a reflective bowl and a plurality of mirrors, a first propagation path and a second propagation path are formed between the light emitting component and the reflective bowl, a preset distance is provided between the second propagation path and the first propagation path along a thickness direction of the lens assembly, at least two mirrors among the plurality of mirrors are disposed between the first propagation path and the second propagation path, and a preset included angle is provided between the respective mirrors among the at least two mirrors, so that light is reflected to the second propagation path from the first propagation path.

In the scheme that this application provided, through set up the speculum that has preset contained angle between first propagation path and the second propagation path that has the difference in height to make the light along first propagation path can be reflected to second propagation path, because the position of second propagation path rises consequently the position of reflection bowl also can corresponding promotion, thereby reduce the difference in height between reflection bowl and the first propagation path, thereby reduce the thickness of lens subassembly.

In one possible embodiment of the first aspect, the reflecting mirror includes a first reflecting mirror and a second reflecting mirror, the mirror surface of the first reflecting mirror and the mirror surface of the second reflecting mirror are parallel to each other, and the mirror surface of the first reflecting mirror and the mirror surface of the second reflecting mirror are respectively arranged to be inclined in the thickness direction of the lens assembly by an angle ranging from 42 ° to 48 °.

The mode can reduce the setting difficulty of first speculum and second speculum, can also reduce the reflection number of times of light simultaneously, reduces the influence of reflection to the propagation of light.

In one possible embodiment of the first aspect, the reflecting mirror includes a first reflecting mirror and a second reflecting mirror, the mirror surface of the first reflecting mirror and the mirror surface of the second reflecting mirror are perpendicular to each other, and the mirror surface of the first reflecting mirror and the mirror surface of the second reflecting mirror are respectively arranged in an inclined manner along the thickness direction of the lens assembly, and the inclined angle ranges from 42 ° to 48 °.

By the mode, light of the first propagation path can be reflected to the second propagation path located at a higher position, and meanwhile the propagation direction of the light can be changed, namely the first propagation path and the second propagation path can be vertically arranged, so that the size of the lens assembly in the length direction is reduced, and the size of the projection equipment is further reduced.

In one possible implementation of the first aspect, the lens group of the lens assembly is located in the second propagation path, and the mirror is located between the light emitting component and the lens group.

Such a manner may reflect light before it propagates to the reflective bowl, reducing the impact on the imaging quality of the lens assembly.

In one possible implementation of the first aspect, the lens group of the lens assembly includes a first lens group and a second lens group, the first lens group is located in the first propagation path, the second lens group is located in the second propagation path, and the mirror is located between the first lens group and the second lens group.

The light can be reflected after the light emitting component emits light, the required mirror surface area of the reflector can be further reduced, and the volume of the reflector is reduced, so that the whole volume of the lens assembly is reduced.

In one possible embodiment of the first aspect, the lens group is a cut-processed lens group, and a portion of the lens group not used for refracting light is cut away.

In this way, the volume of the lens group can be reduced, thereby reducing the volume of the lens group.

On the other hand, this application provides a projection equipment, and projection equipment includes casing and lens subassembly, and the casing includes the cavity, lens subassembly install in the cavity, wherein, the lens subassembly is the lens subassembly of above arbitrary item.

By adopting the lens assembly provided above, the overall volume of the projection apparatus can be reduced as the mounting space required for the lens assembly is reduced.

In a possible embodiment of another aspect, the housing of the projection device is provided with a through hole for transmitting light.

Interference of the housing to light propagation can be reduced by providing the housing with the through hole.

In another possible embodiment, the projection apparatus further includes a blocking portion for blocking the through hole;

the plugging part is made of transparent material.

Through such design, the integrality of the shell can be improved on the premise of not influencing the imaging of the projection equipment, so that the overall structural strength of the shell is improved.

On the other hand, this application still provides a projection equipment, and projection equipment includes casing and lens subassembly, and the lens subassembly is installed in the cavity of casing, and the upper surface of casing has the through-hole for make the light of lens subassembly can transmit to the screen. The lens component comprises a light emitting component, a reflecting bowl and a plurality of reflecting mirrors, a first propagation path, a second propagation path and a third propagation path are formed between the light emitting component and the reflecting bowl, the first propagation path and the second propagation path are parallel to each other and have height difference along the thickness direction of the lens component, and the third propagation path close to the light emitting component is perpendicular to the first propagation path. The first reflector and the second reflector are positioned between the first propagation path and the second propagation path, and the mirror surfaces of the first reflector and the second reflector have a preset included angle so as to reflect the light of the first propagation path to the second propagation path. The third reflector is located between the first propagation path and the third propagation path, and is used for reflecting the light of the third Arabic path to the first propagation path. The reflective bowl is used for reflecting the light of the second propagation path to the screen.

Through such design not only will can promote the reflection bowl for the height that sets up of first transmission route, optimize the structure of lens subassembly, reduce the thickness of lens subassembly, simultaneously, because the perpendicular first transmission route of third transmission route, judge part can be perpendicular to the lens group setting of first transmission route promptly, the whole structure that can be "L" of lens subassembly reduces the size of lens subassembly in its length direction, and then reduces projection equipment's whole volume.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic diagram of an internal structure of a projection apparatus in one embodiment of the prior art provided in the present application;

FIG. 2 is a schematic diagram of a projection apparatus in one embodiment of the prior art provided in the present application;

FIG. 3 is an optical path diagram of a first embodiment of a lens assembly provided herein;

FIG. 4 is an optical path diagram of a second embodiment of a lens assembly provided herein;

FIG. 5 is an optical path diagram of a third embodiment of a lens assembly provided herein;

fig. 6 is a schematic structural diagram of a third embodiment of a lens assembly provided in the present application;

fig. 7 is a schematic structural diagram of a fourth embodiment of a lens assembly provided in the present application;

fig. 8 is a schematic structural diagram of a fifth embodiment of a lens assembly provided in the present application;

fig. 9 is a schematic structural diagram of a sixth embodiment of a lens assembly provided in the present application;

fig. 10 is a schematic structural diagram of a seventh embodiment of a lens assembly provided in the present application;

FIG. 11 is a cross-sectional view of a projection device provided herein;

FIG. 12 is a schematic diagram of an internal structure of a projection apparatus provided in the present application;

FIG. 13 is a schematic structural diagram of a projection apparatus provided in the present application;

FIG. 14 is a graph of spatial frequency versus contrast provided by the present application;

FIG. 15 is a schematic diagram of pixel sampling of a projection apparatus provided herein;

fig. 16 is a graph of imaging plane position versus resolution provided by the present application.

Reference numerals:

1 '-shell, 11' -upper surface, 111 '-through hole, 2' -lens group, 3 '-reflection bowl, 4' heat dissipation component;

1-lens group, 11-first lens group, 12-second lens group;

2-mirror, 21-first mirror, 22-second mirror, 23-third mirror;

3-a reflective bowl;

4-a light emitting component;

5-shell, 51-cavity, 52-upper surface, 521-through hole;

6-heat dissipation components;

7-a blocking part;

l1-first propagation path, L2-second propagation path, L3-third propagation path;

a-lens assembly.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be noted that the terms "upper" and the like used in the description of the embodiments of the present application are used in the angle shown in the drawings and should not be construed as limiting the embodiments of the present application.

With the development of the technology, projection equipment (such as a laser television) has gradually replaced a traditional television and becomes a video equipment commonly used in life of people, and because the projection equipment such as the laser television adopts a diffuse reflection imaging mode through a reflection bowl, compared with the traditional television, the damage to eyes of a viewer can be reduced.

As shown in fig. 1, a lens assembly of a conventional projection apparatus may include a plurality of sets of lenses and a reflection bowl 3 ', and the lenses magnify and image light emitted from a light modulator, and in general, a projection apparatus such as a laser television is placed on a desk or the like at a lower position relative to a screen, and the reflection bowl 3' reflects light processed by the lenses to be projected on the screen, so that a user can view the light. Because the position of the screen is usually higher than the position of the projection device, in order to enable the light to be reflected to the position of the screen, the reflection bowl 3 ' needs to be arranged at a position lower than the optical axis, such a design results in that the arrangement position of the reflection bowl 3 ' is lower, the distance between the lower end of the reflection bowl 3 ' and the propagation path is larger, and a larger lower space needs to be occupied. Meanwhile, along the thickness direction Z of the projection equipment, the heat dissipation part 4 'is arranged between the shell and the lens assembly, and the lens group 2' and the reflection bowl 3 'are lower relative to the heat dissipation part 4', and other parts are not arranged above the lens group, so that the internal space of the projection equipment is wasted, the whole volume of the projection equipment is increased, and the projection equipment is not convenient to place.

In general, since the reflective bowl 3 ' is disposed at a lower position, which results in a larger distance between the reflective bowl 3 ' and the upper surface 11 ' of the housing 1 ' of the projection device, when light passes through the plane where the upper surface 11 ' of the housing 1 ' is located after being reflected by the reflective bowl 3 ', the light is diffused more, so as to reduce the interference of the housing 1 ' to the light, as shown in fig. 2, a larger through hole 111 ' needs to be formed in the housing 1 ', since the area of the through hole 111 ' is larger, the cost for plugging the through hole is higher, and meanwhile, when the through hole 111 ' is plugged by glass, since the area of the glass for plugging is larger, the light propagation is affected, and the imaging quality of the projection device is reduced, therefore, in combination with the considerations of cost and imaging quality, the plugging is not usually performed, such a design not only results in the reduction of the overall structure of the housing 1 ', dust is also easily caused to fall into the interior of the projection apparatus along the through-hole 111' and is inconvenient to clean.

In view of this, an embodiment of the present application provides a lens assembly of a projection apparatus and a projection apparatus, which are used to solve the problem that the lens assembly of the projection apparatus in the prior art occupies a large space.

As shown in fig. 3, an embodiment of the present application provides a lens assembly a of a projection apparatus, where the lens assembly a includes a light emitting component 4, a plurality of lens groups 1, a reflective bowl 3, and a plurality of reflective mirrors 2, each lens group 1 is composed of one or more of a plurality of plane mirrors, concave lenses, and convex lenses, the light emitting component 4 may be an optical demodulator, a first propagation path L1 and a second propagation path L2 are formed between the light emitting component 4 and the reflective bowl 3, the reflective mirror 2 is disposed between the first propagation path L1 and the second propagation path L2, light propagates to the reflective mirror 2 along the first propagation path L1, and after being reflected by the reflective mirror 2, the light can propagate to the reflective bowl 3 along the second propagation path L2, and a position of the second propagation path L2 is higher than a position of the first propagation path L1 along a thickness direction Z of the lens assembly a.

The lens assembly a of the projection apparatus provided by the embodiment of the present application, by disposing the reflector 2 between the first propagation path L1 and the second propagation path L2 of the light, so that the reflector 2 can reflect the light, so that, in the thickness direction Z of the lens assembly a, the position of the second propagation path L2 can be raised, since the position of the second propagation path L2 is raised, the installation position of the reflection bowl 3 can be raised accordingly, the distance between the lower end portion of the reflection bowl 3 and the first propagation path L1 (the height difference between the reflection bowl 3 and the first propagation path L1) in the thickness direction Z of the lens assembly a can be reduced, the structure of the lens assembly a can be optimized, when the lens assembly A is applied to projection equipment, the space required by installation can be reduced, so that the thickness of the projection equipment can be reduced, and the whole volume is reduced.

The number of the reflecting mirrors 2 may be plural, the setting position and the reflecting angle of each reflecting mirror 2 may be set according to actual situations, as shown in fig. 4, in a possible design, the reflecting mirror 2 may include a first reflecting mirror 21, a second reflecting mirror 22 and a third reflecting mirror 23, the lens group 1 may include a first lens group 11 and a second lens group 12, the first lens group 11 is located on a first propagation path L1, the second lens group 12 is located on a second propagation path L2, light propagates to the first reflecting mirror 21 through the first lens group 11 along the first propagation path L1, is reflected to the second reflecting mirror 22 through the first reflecting mirror 21, is reflected to the third reflecting mirror 23 through the second reflecting mirror 22, is reflected to the second propagation path L2 through the third reflecting mirror 23, and propagates to the reflecting bowl 3 through the second lens group 12.

It should be noted that, the specific number of the reflectors 2 may be selected according to actual situations, and may be two, three or more, and during the reflection process of each reflector 2, except the reflection angle of the last reflection, the reflection angles of other reflections are not specifically limited, and there is no mutual interference between the incident light and the emergent light, and the reflection angle of the last reflection needs to satisfy the requirement of being able to reflect the light to the second propagation path L2.

Specifically, as shown in fig. 5, in one possible implementation, the reflecting mirror 2 may include a first reflecting mirror 21 and a second reflecting mirror 22, and the mirror surface of the first reflecting mirror 21 and the mirror surface of the second reflecting mirror 22 are respectively disposed inclined by 45 ° with respect to the thickness direction Z of the lens assembly a.

Through such design can make light pass through twice 90 reflection after propagating along first propagation path L1 and can get into second propagation path L2, compare in the scheme that sets up three or more speculum 2, the reflection number of times of light can be reduced to such design to can reduce the reflection to the influence of the propagation of light, make the camera lens can project clear image, promote user's use experience.

Specifically, as shown in fig. 5, in a possible implementation manner, the first reflecting mirror 21 and the second reflecting mirror 22 may be disposed parallel to each other, such a design can reduce the difficulty in installing the first reflecting mirror 21 and the second reflecting mirror 22, and at the same time, can reduce the cost, and better meet the requirement of actual production.

Here, it should be noted that the inclination angles of the first reflecting mirror 21 and the second reflecting mirror 22 with respect to the thickness direction Z of the lens assembly a are not necessarily 45 °, and specific angles may be adjusted according to actual conditions, and the inclination angles may be 42 ° to 48 °, and similarly, the parallelism in the above-described embodiment is not absolutely parallel, but is in a state of being approximately parallel.

In one possible design, the specific data for each lens group 1 are as follows:

table 1:

the data provided in table 1 is a kind of practical data in the embodiment of the present application, and each column of data respectively represents the type, radius, center thickness, material, net diameter, and hyperbolic coefficient of each lens. The STANDARD is a lost-surface lens, the EVENASPH is an even-order aspheric lens, and each item of data can be adjusted according to the actual situation, and is not limited to the above data.

The mirror parameters for each lens in table 1 are as follows:

Surface 1 EVENASPH

Surface 2 EVENASPH DFK61 glass unknown:use Model

Surface 3 EVENASPH

Surface 10 COORDBRK

Surface 11 STANDARD

Surface 12 COORDBRK

Surface 13 COORDBRK

Surface 15 COORDBRK

Surface 18 EVENASPH DZK2 glass unknown:use Model

Surface 19 EVENASPH

Surface 26 EVENASPH DLAK6 glass unknown:use Model

Surface 27 EVENASPH

Surface 33 EVENASPH DFK61

Surface 34 EVENASPH

Surface 39 COORDBRK

Surface 40 STANDARD

Aperture : Rectangular Aperture

X Half Width : 17.957096

Y Half Width : 15.56

Surface 41 COORDBRK

the data respectively correspond to the Curved Surface parameters of the Curved Surface lens in table 1, wherein Surface represents a Mirror Surface, Mirror Substrate, Curved represents curvature, Thickness represents Thickness, and Coefficient of cone of n-order term of even-order aspheric Surface is represented by coeffient on r ^ n (n is 2, 4, 6 and 8.). In processing the curved lenses in table 1, the curved surfaces can be processed according to the curved surface parameters provided above. Taking the first set of data as an example, Surface 1EVENASPH represents lens 1 corresponding to table 1, lens 1 is an even aspheric lens, Curved, Thickness 2.78002E +00 is the curvature and Thickness of the lens, Coefficient on r ^ n is the conic Coefficient of the even aspheric Surface, since the lens is an even aspheric lens, n is an even number, Circular Aperture represents a Circular Aperture, Minimum Radius represents the Minimum Radius of the lens, and Maximum Radius represents the Maximum Radius of the lens.

Corresponding lenses can be processed by combining the data in the table 1 and the data, the processed lenses are combined to form the lens group 1, the lens group 1 is installed at the corresponding position of the lens assembly A, and the lens assembly A is completely assembled, so that the scheme of the embodiment of the present application can be formed, and the same effects are achieved.

It should be noted that the data provided above is only one case capable of achieving the technical effects of the embodiments of the present application, and the structures of the lenses may be adjusted according to actual situations, and when the structure of one of the lenses changes, the refraction angle of light passing through the lens also changes, so the structures of the other lenses also need to be changed accordingly, and the changed lenses are combined into the lens group 1, and the lens group 1 is applied to the lens assembly a, which may also achieve the corresponding technical effects, and will not be described herein again.

As shown in fig. 6, in one possible design, the lens group 1 may include a first lens group 11 and a second lens group 12, wherein the first lens group 11 is located on a first propagation path L1, the second lens group 12 is located on a second propagation path L2, and the first mirror 21 and the second mirror 22 are located between the first lens group 11 and the second lens group 12.

In this way, light can be reflected before propagating to the reflection bowl 3, so that the influence on the imaging quality of the lens assembly a can be reduced, and the projected image of the lens assembly a is clearer.

Specifically, as shown in fig. 3, in one possible implementation, the first lens group 11 is a plane mirror for filtering light, the second lens group 12 is a convex lens for magnifying imaging, and the first reflector 21 and the second reflector 22 are disposed between the first lens group 11 and the second lens group 12, so that light can be reflected before an image is magnified by the convex lens, and thus the mirror surface area of the reflector 2 can be reduced, the volume of the reflector 2 can be reduced, and the overall volume of the lens assembly a can be reduced.

As shown in fig. 7, in one possible implementation, the light generated by the light emitting part 4 can travel to the first lens group 11 along a first travel path L1, the first lens group 11 and the second lens group 12 are sequentially disposed along the length direction X of the lens assembly a on a second travel path L2, and the first reflecting mirror 21 and the second reflecting mirror 22 are located between the light emitting part 4 and the first lens group 11.

By means of the design, light can be reflected after the light emitting component 4 emits light, so that the mirror surface area of the reflector 2 can be further reduced, the volume of the reflector 2 is reduced, and the whole volume of the lens assembly A is reduced.

As shown in fig. 8, in a possible implementation manner, the reflector 2 further includes a third reflector 23, the light propagation path further includes a third propagation path L3, the third propagation path L3 extends along the width direction Y of the lens assembly a, the third propagation path is perpendicular to the first propagation path, the third reflector 23 may be disposed between the light emitting component 4 and the first lens group 11, the first reflector 21 and the second reflector 22 are disposed between the first lens group 11 and the second lens group 12, the first lens group 11 is located on the first propagation path L1, the second lens group 12 is located on the second propagation path L2, the light emitted by the light emitting component 4 firstly propagates along the third propagation path L3, and enters the first propagation path L1 after being reflected by the third reflector 23, and then enters the second propagation path L2 after being reflected by the first mirror 21 and the second mirror 22 and propagates to the reflection bowl 3. The design can also achieve the purpose of reducing the length of the lens component A, so that the structure of the projection equipment is convenient to optimize, and the volume of the projection equipment is reduced.

It should be noted that, in the above embodiments, the vertical is not the absolute vertical, but the vertical state is assumed, including the state of approximately assuming the vertical state.

As shown in fig. 9, in one possible implementation, the first reflector 21 and the second reflector 22 are perpendicular to each other, the first reflector 21 and the second reflector 22 are respectively disposed at an angle of 45 degrees with respect to the thickness direction Z of the lens assembly a, the first reflector 21 and the second reflector 22 are located between the first lens group 11 and the second lens group 12, the first propagation path L1 is parallel to the length direction X of the lens assembly a, and the second propagation path L2 is perpendicular to the length direction X of the lens assembly a.

By such a design, in the process of light propagation, the first reflecting mirror 21 is used for reflecting light in the thickness direction of the lens assembly a, and the second reflecting mirror 22 is used for reflecting light to a plane parallel to the first propagation path L1 and changing the propagation direction of the light, so that the light can propagate in the length direction X perpendicular to the lens assembly a.

As shown in fig. 10, in a possible implementation manner, each lens group 1 may be cut, in order to enable the reflection bowl 3 to reflect the light to a higher position, the light needs to be refracted through the lens group 1 to deflect, and in a general case, in a thickness direction Z of the lens assembly a, the light passes through a lower portion of the lens group 1, that is, a portion of the lens group 1 lower than the optical axis, so as to enable the light to be refracted to a relatively lower position, and a portion of the lens group 1 not used for refracting the light may be cut, so as to further reduce the volume of the lens group 1, thereby reducing the space occupied by the lens group 1, and reducing the volume of the whole lens assembly a.

It should be noted that the specific cutting scheme of the lens assembly 1 can be made according to practical situations as long as the cutting scheme does not affect the normal transmission and imaging of light in the lens assembly a.

As shown in fig. 11, an embodiment of the present application further provides a projection device, where the projection device includes a housing 5 and a lens assembly a, the housing 5 has a cavity 51, and the lens assembly a is mounted in the cavity 51, where the lens assembly a is the lens assembly a related to any one of the above embodiments, and because the lens assembly a has the above technical effects, the projection device including the lens assembly a also has the above technical effects, and details are not repeated here.

Specifically, the lens assembly a may be mounted in a position as shown in fig. 12.

Along projection equipment's thickness direction Z, heat dissipation part 6 is located between camera lens subassembly A and the casing 5, because the position of second lens group 12 promotes, along the thickness direction Z who sees camera lens subassembly A, second lens group 12 is in similar position with heat dissipation part 6, consequently, can make projection equipment's structure compacter, and spatial layout is more reasonable, and then reduces projection equipment's whole volume.

As shown in fig. 13, in one possible implementation, the upper surface 52 of the housing 5 has a through hole 521, and the light reflected by the reflecting bowl 3 is transmitted to the screen through the through hole 521, so that an image can be presented on the screen.

In the projection equipment that this application embodiment provided, because the promotion of the position that sets up of reflection bowl 3, consequently, the light that reflects through reflection bowl 3 is when the plane at upper surface 52 place through casing 5, and the diffusion also can reduce, consequently can reduce the area of through-hole 521 to promote casing 5's structural strength. In a possible design, the projection apparatus further includes a blocking portion 7, the blocking portion 7 may be made of transparent material such as glass, and is used for blocking the through hole 521, such a design can further improve the integrity of the housing 5, and further improve the structural strength of the housing 5 of the projection apparatus, and meanwhile, since the area of the through hole 521 is small, the area of the blocking portion 7 is also relatively small, thereby reducing errors caused by refraction of light when passing through the blocking portion 7, and improving the definition of imaging.

As shown in fig. 14, the abscissa of the drawing indicates the spatial frequency (resolution), and the ordinate indicates the contrast of the image, which can be seen from the figure that the imaging quality of the lens assembly a provided by the embodiment of the present application is high.

As shown in fig. 15, the images shown in the figure are the sampling points selected in the screen and the data of each sampling point, wherein the data of each sampling point includes: the size from the center point which can be perceived by human eyes to the average radius and the size from the center point which can be perceived by human eyes to the farthest radius are used for judging whether crosstalk occurs between imaging pixel points.

As shown in fig. 16, in which the abscissa indicates the position of the imaging plane (screen) and the ordinate indicates the resolution, the tolerance of the lens assembly a can be derived, and when there is an error in the mounting position of the screen, the imaging quality of the lens assembly a is obtained under different errors.

The lens assembly a provided by the embodiment of the present application has high performance and quality in the actual use process according to the above data.

It should be noted that the data provided in the embodiments of the present application are all data measured during actual use.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art.

Claims

1. A lens assembly, the lens assembly comprising:

a light emitting part for emitting light;

a reflective bowl for reflecting light to the screen;

a plurality of mirrors for reflecting light;

a first propagation path and a second propagation path are formed between the light emitting component and the reflecting bowl, and a preset distance is reserved between the position of the second propagation path and the position of the first propagation path along the thickness direction of the lens assembly;

at least two of the plurality of reflecting mirrors are arranged between the first propagation path and the second propagation path, and a preset included angle is formed between the mirror surfaces of the reflecting mirrors in the at least two reflecting mirrors, so that light is reflected from the first propagation path to the second propagation path.

2. The lens assembly of claim 1, wherein the mirror comprises a first mirror and a second mirror, the mirror surface of the first mirror and the mirror surface of the second mirror being parallel to each other;

along the thickness direction of the lens assembly, the mirror surface of the first reflecting mirror and the mirror surface of the second reflecting mirror are respectively arranged in an inclined mode, and the inclined angle range is 42-48 degrees.

3. The lens assembly of claim 1, wherein the mirror comprises a first mirror and a second mirror, the mirror surface of the first mirror and the mirror surface of the second mirror being perpendicular to each other;

4. The lens assembly of claim 1, wherein the lens assembly further comprises a lens group;

the lens group is located in the second propagation path, and the mirror is located between the light emitting part and the lens group.

5. The lens assembly of claim 1, wherein the lens assembly comprises a lens group comprising a first lens group and a second lens group, the first lens group being located in the first propagation path, the second lens group being located in the second propagation path, and the mirror being located between the first lens group and the second lens group.

6. The lens assembly of any one of claims 4 to 5, wherein the lens group is a lens group that cuts a portion of unrefracted light.

7. A projection device, comprising a housing and a lens assembly, wherein the housing comprises a cavity and the lens assembly is mounted in the cavity;

the lens assembly is as claimed in any one of claims 1-6.

8. The projection device of claim 7, wherein the housing is provided with a through hole through which light reflected by the reflective bowl passes to the screen.

9. The projection apparatus according to claim 8, wherein the projection apparatus includes a blocking portion for blocking the through hole;

the plugging part is made of transparent material.

10. The projection equipment is characterized by comprising a shell and a lens assembly, wherein the shell comprises an upper surface, a through hole is formed in the upper surface, and the lens assembly is arranged in a cavity of the shell;

the lens assembly comprises a light emitting component, a reflecting bowl and a reflecting mirror, wherein the reflecting mirror comprises a first reflecting mirror, a second reflecting mirror and a third reflecting mirror;

a first propagation path, a second propagation path and a third propagation path are formed between the light emitting component and the reflecting bowl;

the third propagation path is proximate to the light emitting component and the second propagation path is proximate to the reflective bowl;

the first propagation path and the second propagation path are parallel to each other, a preset distance is reserved between the second propagation path and the first propagation path along the thickness direction of the lens assembly, and the third propagation path is perpendicular to the first propagation path;

the third reflector is positioned between the third propagation path and the first propagation path, and a mirror surface of the third reflector is obliquely arranged relative to the third propagation path and used for reflecting the light of the third propagation path to the first propagation path;

the first reflector and the second reflector are positioned between the first propagation path and the second propagation path, and a preset included angle is formed between the mirror surface of the first reflector and the mirror surface of the second reflector, so that light of the first propagation path is reflected to the second propagation path;

the reflection bowl is used for reflecting the light of the second propagation path to a screen.