Projection equipment and ultra-short-focus image capturing camera

Abstract

The embodiment of the invention belongs to the laser intelligent projection technology, and provides projection equipment and an ultra-short-focus image capturing camera, and the projection equipment comprises a projection lens which is used for projecting a projection picture to a projection screen; the ultra-short-focus image taking camera is located in the projection lens and comprises a light sensing module, a lens group and a reflector module, the reflector module is used for reflecting light beams emitted by the projection screen to the lens group so that the light beams can enter the light sensing module through the lens group, and the light sensing module is used for generating corresponding images. On the basis of the reflector module included in the ultra-short-focus image capturing camera, the range of the received light beams emitted by the projection screen can be expanded, so that for the ultra-short-focus projection equipment, the full-image collection of large-angle light can be realized by one ultra-short-focus image capturing camera, and the system structure of the projection equipment is simplified.

Description

Technical Field

[0001] The embodiments of the present application relate to laser intelligent projection technology. In particular, it relates to a projection device and an ultra-short focus imaging camera. Background Art

[0002] As a product for scenario-based requirements, intelligent projection products need to cover more functions in the usage scenario. Currently, projection products carry a variety of intelligent algorithms by themselves, such as automatic correction, automatic focusing, automatic trapezoid correction, automatic screen entry, etc. The above algorithms need to use a camera and a TOF (Time of Flight) component to implement the algorithm solution.

[0003] In an ultra-short focus projector, a long-focus or short-focus camera can be used for imaging to implement the above intelligent algorithms. Since usually two or more sets of cameras are required, the system structure of the ultra-short focus projector is relatively complex. Summary of the Invention

[0004] The embodiments of the present application provide a projection device and an ultra-short focus imaging camera, which can be used to solve the problem in the related art that the ultra-short focus projector requires two or more sets of cameras, resulting in a relatively complex system structure of the ultra-short focus projector.

[0005] In a first aspect, the embodiments of the present application provide a projection device, and the projection device includes:

[0006] A projection lens for projecting a projection image onto a projection screen;

[0007] An ultra-short focus imaging camera located within the projection lens, including a photosensitive module, a lens group, and a mirror module. The mirror module is used to reflect the light beam emitted from the projection screen to the lens group, so as to enter the photosensitive module through the lens group, and the photosensitive module is used to generate a corresponding image.

[0008] In some embodiments of the present application, the projection lens includes a first reflector bowl, and the distance from the first reflector bowl to the projection screen is greater than or equal to the distance from the mirror module to the projection screen.

[0009] In some embodiments of the present application, the projection lens further includes a lens assembly, and the lens closest to the first reflector bowl in the lens assembly is the first lens;

[0010] The length of the ultra-short focus imaging camera is less than the distance from the first reflector bowl to the first lens; wherein, the length of the ultra-short focus imaging camera is the distance between the photosensitive module and the mirror module.

[0011] In some embodiments of the present application, the sum of the distance from the first lens to the projection screen and the length of the ultra-short focus imaging camera is less than the distance from the mirror module to the projection screen.

[0012] In some embodiments of the present application, the projection lens further includes a lens assembly, and the lens closest to the first reflector bowl in the lens assembly is the first lens;

[0013] The sum of the distance from the first lens to the projection screen and the length of the ultra-short focus imaging camera is greater than or equal to the distance from the mirror module to the projection screen.

[0014] In some embodiments of the present application, the distance between the optical axis of the projection lens and the bottom of the projection screen is greater than the distance between the optical axis of the ultra-short focus imaging camera and the optical axis of the projection lens, and the bottom of the projection screen is the side close to the projection lens.

[0015] In some embodiments of the present application, the first projection ratio of the projection lens is greater than or equal to the second projection ratio of the ultra-short focus imaging camera.

[0016] In some embodiments of the present application, the mirror module is a convex mirror, or a concave mirror, or a plane mirror.

[0017] In some embodiments of the present application, the projection device includes a second reflector bowl, wherein the first reflection area of the second reflector bowl is the first reflector bowl, and the second reflection area is the mirror module.

[0018] In a second aspect, an embodiment of the present application provides an ultra-short focus imaging camera. The ultra-short focus imaging camera is located in the projection lens and includes a photosensitive module, a lens group, and a mirror module. The mirror module is configured to reflect the light beam emitted from the projection screen to the lens group, so as to enter the photosensitive module through the lens group, and the photosensitive module is configured to generate a corresponding image.

[0019] The present application provides a projection device and an ultra-short focus imaging camera. The projection device includes a projection lens and an ultra-short focus imaging camera. The projection lens is configured to project a projection image onto a projection screen. The ultra-short focus imaging camera is located in the projection lens and includes a photosensitive module, a lens group, and a mirror module. The mirror module reflects the light beam emitted from the projection screen to the lens group, and enters the photosensitive module through the lens group. The photosensitive module can generate a corresponding image. Based on the mirror module included in the ultra-short focus imaging camera, the present application can expand the range of the light beam emitted from the projection screen received. Therefore, for an ultra-short focus projection device, only one ultra-short focus imaging camera is required to achieve full-screen collection of large-angle light, without the need for multiple long-focus cameras or short-focus cameras, which simplifies the system structure of the projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic diagram of the working principle of a short-throw imaging camera based on a projection lens provided by an embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the structure of a projection device provided by an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram of the structure of a mirror module provided by an embodiment of the present application;

[0024] Figure 4 It is a schematic diagram of the axial position relationship of a short-throw imaging camera provided by an embodiment of the present application Figure 1 ;

[0025] Figure 5 It is a schematic diagram of the relationship between the projection distance and the screen width provided by an embodiment of the present application;

[0026] Figure 6 It is a schematic diagram of the axial position relationship of a short-throw imaging camera provided by an embodiment of the present application Figure 2 ;

[0027] Figure 7 It is a schematic diagram of the axial position relationship of a short-throw imaging camera provided by an embodiment of the present application Figure 3 ;

[0028] Figure 8 It is a schematic diagram of the vertical position relationship of a short-throw imaging camera provided by an embodiment of the present application Figure 1 ;

[0029] Figure 9 It is a schematic diagram of the vertical position relationship of a short-throw imaging camera provided by an embodiment of the present application Figure 2 ;

[0030] Figure 10 It is a schematic diagram of the positional relationship between a short-throw imaging camera and a projection lens provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] To make the objectives, embodiments, and advantages of this application clearer, the following will clearly and completely describe the exemplary embodiments of this application with reference to the accompanying drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part, rather than all, of the embodiments of this application.

[0032] It should be noted that the brief description of the terms in this application is only for facilitating the understanding of the subsequent described embodiments, rather than intending to limit the embodiments of this application. Unless otherwise specified, these terms should be understood in their ordinary and general meanings.

[0033] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclusively include. For example, a product or device including a series of components does not necessarily have to be limited to those components clearly listed, but may include other components not clearly listed or inherent to these products or devices.

[0034] In the description of this application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for facilitating the description of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application.

[0035] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0038] As a product for scenario-based requirements, intelligent projection products need to cover functions for the usage scenarios more. Currently, projection products can carry a variety of intelligent algorithms by themselves: automatic calibration, automatic focusing, automatic trapezoidal correction, automatic screen entry, etc. The above algorithms all need to use a camera and a TOF (Time of Flight) component to implement the algorithm solutions. However, currently, the relevant intelligent algorithms for ultra-short-throw projection require two or more camera modules because the existing camera focal lengths are long focal lengths and cannot achieve full-screen collection of large-angle light rays similar to ultra-short-throw.

[0039] Based on this, the present application provides a projection device, which can internally install an ultra-short-throw imaging camera in the projection lens. The ultra-short-throw imaging camera includes a photosensitive module, a lens group, and a mirror module. Among them, the mirror module reflects the light beam emitted from the projection screen to the lens group, and the light beam enters the photosensitive module through the lens group. The photosensitive module is used to generate corresponding images. Since the ultra-short-throw camera of the present application can expand the range of the light beam emitted from the projection screen received through the mirror module, the image of the projection device projected can be captured within a smaller projection distance, achieving full-screen collection of large-angle light rays, and there is no need for multiple long-focal-length or short-focal-length cameras to collect images, simplifying the system structure of the projection device.

[0040] Figure 1 It is a schematic diagram of the working principle of an ultra-short-throw imaging camera based on a projection lens provided by an embodiment of the present application. As Figure 1 shown, the projection lens 11 includes a lens assembly 111 and a first reflector 112. The light beam emitted from the lens assembly 111 is reflected by the first reflector 112 to the projection screen 13. The light beam emitted from the projection screen 13 can enter the ultra-short-throw imaging camera 12. The ultra-short-throw imaging camera 12 is located inside the projection lens 11 and can perform image acquisition, generate corresponding images, and send the images to the main chip for processing to obtain the position information of the projection screen 13, etc.

[0041] Figure 2 It is a schematic structural diagram of a projection device provided by an embodiment of the present application. As Figure 2 shown, the projection device includes:

[0042] A projection lens 11 for projecting a projection image onto a projection screen 13;

[0043] The ultra-short focus imaging camera 12 is located within the projection lens 11 and includes a photosensitive module 121, a lens group 122, and a mirror module 123. The mirror module 123 is configured to reflect the light beam emitted from the projection screen 13 to the lens group 122, so as to be incident on the photosensitive module 121 through the lens group 122, and the photosensitive module 121 is used to generate a corresponding image.

[0044] In some embodiments, based on the optical function division, in addition to the projection lens 11, the projection device may further include a light source and an optical engine. Among them, the light source is used to provide a light source illumination beam, which may be a laser light source and includes lasers of at least one color. The optical engine includes an illumination optical path and a light valve modulation device. After the illumination beam provided by the light source is transmitted through the illumination optical path, it is incident on the light valve modulation device, and the light valve modulation device transmits the beam to the projection lens 11, so that the projection lens 11 projects the beam onto the projection screen 13, and a projection image is displayed on the projection screen 13.

[0045] Among them, in the DLP (Digital Light Processing) projection architecture, the light valve modulation device may be a DMD (Digital Micromirror Device). There are thousands of tiny mirrors on the surface of the DMD, which can be flipped at a positive angle or a negative angle to reflect the beam irradiating its surface into the projection lens 11.

[0046] In some embodiments, the projection lens 11 may be an ultra-short focus projection lens. At this time, the projection device may be referred to as an ultra-short focus projection device. Ultra-short focus generally means that the light beam emitted from the projection lens is incident on the projection screen 13 after being reflected by a curved mirror.

[0047] For the ultra-short focus imaging camera 12 of the present application, the projection ratio range may be less than or equal to 0.25, and it can simultaneously satisfy the image taking of the projection ratio of 0.25 and below. In one implementation scenario, the projection ratio of the ultra-short focus imaging camera 12 is 0.15 - 0.25.

[0048] The architectural principle of the ultra-short focus imaging camera 12 is basically the same as that of the ultra-short focus projection lens, including a mirror module 123 and a lens group 122. The lens group 122 and the mirror module 123 are used for image collection. Among them, the lens group 122 may include multiple lenses to make the beam reflected by the mirror module 123 incident on the photosensitive module 121. In some embodiments, the mirror module 123 is a convex mirror, or a concave mirror, or a plane mirror. For details, please refer to Figure 3 as shown, Figure 3 which is a schematic structural diagram of a mirror module provided by an embodiment of the present application.

[0049] In addition to the mirror module 123 and the lens group 122, the ultra-short focus imaging camera 12 further includes a photosensitive module 121 to generate corresponding images, that is, to achieve image acquisition. In one implementation scenario, the photosensitive module 121 can be a CMOS (Complementary Metal Oxide Semiconductor) photosensitive module 121.

[0050] In one implementation scenario, the image generated by the photosensitive module 121 is a screen image including the projection screen 13, and the image can be sent to the main chip of the projection device. The main chip can then process and analyze the image to obtain specific position information of the projection screen 13, etc. Further, automatic correction, autofocus, automatic trapezoid correction, automatic screen entry, etc. can be achieved according to the specific position information of the projection screen 13.

[0051] In some embodiments, the projection lens 11 includes a first reflector bowl 112, and the distance from the first reflector bowl 112 to the projection screen 13 is greater than or equal to the distance from the mirror module 123 to the projection screen 13.

[0052] Figure 4 Schematic diagram of the axial position relationship of an ultra-short focus imaging camera provided by an embodiment of the present application Figure 1 , the axis is the direction where the optical axis O2 of the ultra-short focus imaging camera 12 is located or the direction where the optical axis O1 of the projection lens 11 is located, and the two directions are the same. Refer to Figure 4 As shown, the distance from the first reflector bowl 112 to the projection screen 13 is denoted as H1, and the distance from the mirror module 123 of the ultra-short focus imaging camera 12 to the projection screen 13 is denoted as H2, H1≥H2. From Figure 4 it can be seen that at this time, the ultra-short focus imaging camera 12 is located between the first reflector bowl 112 and the projection screen 13, so that the ultra-short focus imaging camera 12 is located inside the projection lens 11.

[0053] In another implementation scenario, if the distance H1 from the first reflector bowl 112 to the projection screen 13 is less than the distance H2 from the mirror module 123 to the projection screen 13, that is, when H1<H2, at this time, compared with the first reflector bowl 112, the mirror module 123 is farther from the projection screen 13, indicating that at this time the mirror module 123 is not located inside the projection lens 11, that is, the ultra-short focus imaging camera 12 is not located inside the projection lens 11.

[0054] In an implementation scenario, in addition to the first reflector bowl 112, the projection lens 11 may further include a lens assembly 111, and the lens assembly 111 includes a plurality of lenses. The ultra-short focus imaging camera 12 may be located in the cavity between the first reflector bowl 112 and the first lens close to the first reflector bowl 112. Alternatively, if in the lens assembly 111, the upper region of one or more lenses close to the first reflector bowl 112 does not transmit the light beam reflected by the first reflector bowl 112 to the projection screen 13, the ultra-short focus imaging camera 12 may also be located in the upper region of the corresponding one or more lenses.

[0055] In some embodiments, the first projection ratio of the projection lens 11 is greater than or equal to the second projection ratio of the ultra-short focus imaging camera 12.

[0056] In an implementation scenario, the projection ratio is the ratio of the projection distance to the picture width, and reference can be made to Figure 5 as shown Figure 5 which is a schematic diagram of the relationship between the projection distance and the picture width provided by the embodiments of the present application. Wherein, W represents the picture width and L represents the projection distance. Generally, the smaller the projection ratio, the larger the picture size that can be projected at the same projection distance.

[0057] For the projection lens 11 and the ultra-short focus imaging camera 12, corresponding to the same projection screen 13, the picture widths corresponding to the two are the same. Therefore, the first projection ratio of the projection lens 11 can be characterized by the projection distance of the projection lens 11, and the second projection ratio of the ultra-short focus imaging camera 12 can be characterized by the projection distance corresponding to the ultra-short focus imaging camera 12.

[0058] The projection distance of the projection lens 11 is the distance H1 between the first reflector bowl 112 and the projection screen 13, and the projection distance corresponding to the ultra-short focus imaging camera 12 is the distance H2 between the mirror module and the projection screen 13. Since the ultra-short focus imaging camera 12 needs to be located inside the projection lens 11, it can be seen from the above embodiments that the distance H1 from the first reflector bowl 112 to the projection screen 13 is greater than or equal to the distance H2 from the mirror module 123 to the projection screen 13, that is, the projection distance of the projection lens 11 is greater than or equal to the projection distance of the ultra-short focus imaging camera 12. Since the projection ratio is proportional to the projection distance, the first projection ratio of the projection lens 11 is greater than or equal to the second projection ratio of the ultra-short focus imaging camera 12.

[0059] The first projection ratio can be denoted as T1, the second projection ratio can be denoted as T2, and the first projection ratio of the projection lens 11 being greater than or equal to the second projection ratio of the ultra-short focus imaging camera 12 means T1≥T2.

[0060] In an implementation scenario, to enable the light emitted from the projection screen 13 to enter the ultra-short-focus imaging camera 12, the projection screen 13 can be a screen capable of diffuse reflection, such as a white wall or a screen without a Fresnel structure, etc.

[0061] In some embodiments, the projection device includes a second reflecting bowl. Among them, the first reflection area of the second reflecting bowl is the first reflecting bowl 112, and the second reflection area is the mirror module 123. That is, the projection lens 11 and the ultra-short-focus imaging camera 12 share the second reflecting bowl, and the ultra-short-focus imaging camera 12 does not need to be provided with a separate mirror module 123.

[0062] An embodiment of the present application provides a projection device, including a projection lens 11 and an ultra-short-focus imaging camera 12. Among them, the projection lens 11 can be used to project a projection image onto the projection screen 13. The ultra-short-focus imaging camera 12 is located inside the projection lens 11 and includes a photosensitive module 121, a lens group 122, and a mirror module 123. The mirror module 123 can be used to reflect the light beam emitted from the projection screen 13 to the lens group 122, and enter the photosensitive module 121 through the lens group 122, so that the photosensitive module 121 generates a corresponding image to achieve image acquisition. In this application, the ultra-short-focus imaging camera 12 is built into the projection lens 11, and image acquisition is achieved by cooperating with the aspherical mirror of the projection lens 11, that is, the first reflecting bowl 112. Based on the mirror module 123 included in the ultra-short-focus imaging camera 12, the range of the light beam emitted from the projection screen 13 received can be expanded, and the image of the projection device projected on the projection screen 13 can be completely acquired within a smaller projection distance, that is, the projection ratio is smaller. Therefore, for an ultra-short-focus projection device, only one ultra-short-focus imaging camera 12 is required to achieve full-screen collection of large-angle light, without two or more long-focus cameras or short-focus cameras, simplifying the system structure of the projection device.

[0063] In one or more embodiments of the present application, the projection lens 11 further includes a lens assembly 111, and the lens closest to the first reflecting bowl 112 in the lens assembly 111 is the first lens;

[0064] The length of the ultra-short-focus imaging camera 12 is less than the distance from the first reflecting bowl 112 to the first lens; wherein, the length of the ultra-short-focus imaging camera 12 is the distance between the photosensitive module 121 and the mirror module 123.

[0065] Figure 6 Schematic diagram of the axial position relationship of an ultra-short-focus imaging camera provided by an embodiment of the present application Figure 2 for reference Figure 6As shown in the figure, the distance from the first reflecting bowl 112 to the first lens 1111 is the difference between the distance H1 from the first reflecting bowl 112 to the projection screen 13 and the distance L1 from the first lens 1111 to the projection screen 13. The length of the ultra-short focus imaging camera 12 is the distance between the mirror module 123 and the photosensitive module 121, which can be denoted as L2. The length L2 of the ultra-short focus imaging camera 12 is less than the distance from the first reflecting bowl 112 to the first lens 1111, that is, L2 < H1 - L1, where H1 - L1 is the distance from the first reflecting bowl 112 to the first lens 1111.

[0066] In an implementation scenario, when the length L2 of the ultra-short focus imaging camera 12 is less than the distance H1 - L1 between the first reflecting bowl 112 and the first lens 1111, the ultra-short focus imaging camera 12 can be located in the cavity between the first reflecting bowl 112 and the first lens 1111. At this time, the sum of the distance L1 from the first lens 1111 to the projection screen 13 and the length L2 of the ultra-short focus imaging camera 12 is less than the distance H2 from the mirror module 123 to the projection screen 13, that is, L1 + L2 < H2. At this time, the ultra-short focus imaging camera 12 is located between the first reflecting bowl 112 and the first lens 1111.

[0067] Or, L1 + L2 < H2 can also be transformed into H2 - L2 > L1, which can be combined with Figure 6 As shown in the figure, H2 - L2 is the distance between the photosensitive module 121 and the projection screen 13. The distance H2 - L2 between the photosensitive module 121 and the projection screen 13 is greater than the distance L1 between the first lens 1111 and the projection screen 13. And the distance H1 between the first reflecting bowl 112 and the projection screen 13 is greater than the distance H2 between the mirror group and the projection screen 13. Therefore, it can be shown that the ultra-short focus imaging camera 12 is located in the cavity between the first reflecting bowl 112 and the first lens 1111.

[0068] In summary, by setting the length L2 of the ultra-short focus imaging camera 12 to be less than the difference between the distance H1 from the first reflecting bowl 112 to the projection screen 13 and the distance L1 from the first lens 1111 to the projection screen 13, that is, the length L2 of the ultra-short focus imaging camera 12 is less than the distance between the first reflecting bowl 112 and the first lens 1111. Further, by setting the sum of the distance L1 from the first lens 1111 to the projection screen 13 and the length L2 of the ultra-short focus imaging camera 12 to be less than the distance H2 from the mirror module 123 to the lens screen, the ultra-short focus imaging camera 12 is located in the cavity between the first reflecting bowl 112 and the first lens 1111.

[0069] In one or more embodiments of the present application, the projection lens 11 further includes a lens assembly 111, and the lens closest to the first reflecting bowl 112 in the lens assembly 111 is the first lens 1111;

[0070] The sum of the distance from the first lens 1111 to the projection screen 13 and the length of the ultra-short focal length imaging camera 12 is greater than or equal to the distance from the mirror module 123 to the projection screen 13.

[0071] In an implementation scenario, the first reflecting bowl 112 reflects a light beam towards the projection screen 13. The projection of the light beam on the first reflecting bowl 112 has two endpoints, namely Figure 7 the shown M1 and M2, Figure 7 which is a schematic diagram of the axial position relationship of an ultra-short focal length imaging camera provided by an embodiment of the present application Figure 3 . Similarly, there are also two corresponding endpoints when the light beam is projected onto the screen, namely Figure 7 the shown P1 and P2. The connection line between endpoint M1 and endpoint P1 is used as the first target connection line, and the connection line between endpoint M2 and endpoint P2 is used as the second target connection line.

[0072] If in the lens assembly 111, one or more lenses close to the first reflecting bowl 112 are located below the first target connection line and below the second target connection line, at this time the ultra-short focal length imaging camera 12 can be located above the first target connection line and the second target connection line. At this time, the light beam reflected by the first reflecting bowl 112 towards the projection screen 13 does not pass through the area where the ultra-short focal length imaging camera 12 is located, and the area where the light beam reflected by the first reflecting bowl 112 towards the projection screen 13 is the area formed by the first target connection line and the second target connection line.

[0073] When the ultra-short focal length imaging camera 12 is located above the first target connection line and the second target connection line, combined with Figure 7 it can be known that the sum of the distance L1 from the first lens 1111 to the projection screen 13 and the length L2 of the ultra-short focal length imaging camera 12 is greater than or equal to the distance H2 from the mirror module 123 to the projection screen 13, that is, L1 + L2 ≥ H2. At this time, it can be shown that the ultra-short focal length imaging camera 12 is not located between the first reflecting bowl 112 and the first lens 1111, but is located above the first target connection line and the second target connection line.

[0074] It should be noted that since the ultra-short focus imaging camera 12 is located above the first target connection line and the second target connection line and not in the cavity between the first reflecting bowl 112 and the first lens 1111, the length L2 of the ultra-short focus imaging camera 12 is not limited by the distance between the first reflecting bowl 112 and the first lens 1111. That is, the length L2 of the ultra-short focus imaging camera 12 can be greater than or equal to the distance H1 - L1 between the first reflecting bowl 112 and the first lens 1111, i.e., L2 ≥ H1 - L1.

[0075] In summary, when in the projection lens 11, the multiple lenses included in the lens assembly 111 are located below the first target connection line and the second target connection line, the ultra-short focus imaging camera 12 can be located above the first target connection line and the second target connection line. At this time, the sum of the distance L1 from the first lens 1111 to the projection screen 13 and the length L2 of the ultra-short focus imaging camera 12 is greater than or equal to the distance H2 from the mirror module 123 to the projection screen 13. Compared with the ultra-short focus imaging camera 12 being located between the first reflecting bowl 112 and the first lens 1111, it avoids the length L2 of the ultra-short focus imaging camera 12 being limited by the distance between the first reflecting bowl 112 and the first lens 1111.

[0076] In one or more embodiments of the present application, the distance between the optical axis of the projection lens 11 and the bottom of the projection screen 13 is greater than the distance between the optical axis of the ultra-short focus imaging camera 12 and the optical axis of the projection lens 11. The bottom of the projection screen 13 is the side close to the projection lens 11.

[0077] Figure 8 Schematic diagram of the vertical position relationship of an ultra-short focus imaging camera provided by an embodiment of the present application Figure 1 , where the vertical direction is the direction perpendicular to the optical axis direction of the ultra-short focus imaging camera 12 or the optical axis of the projection lens 11. Refer to Figure 8 As shown, the optical axis of the projection lens 11 is denoted as O1, and the distance between the optical axis O1 of the projection lens 11 and the bottom of the projection screen 13 is denoted as F1, which represents the OFFSET height or bias height of the projection lens 11. The optical axis of the ultra-short focus imaging camera 12 is O2, and the distance between the optical axis O2 of the ultra-short focus imaging camera 12 and the optical axis O1 of the projection lens 11 is the bias height F2 of the ultra-short focus imaging camera 12. When F1 > F2, the ultra-short focus imaging camera 12 can be located in the area between the optical axis of the projection lens 11 and the bottom of the projection screen 13 to further limit the ultra-short focus imaging camera 12 within the projection lens 11, and at the same time, both F1 and F2 are greater than 0.

[0078] Figure 9 Schematic diagram of the vertical position relationship of an ultra-short focus imaging camera provided by an embodiment of the present application Figure 2。In another implementation scenario, when the distance F1 between the optical axis O1 of the projection lens 11 and the bottom of the projection screen 13 is less than or equal to the distance F2 between the optical axis O2 of the ultra-short focus imaging camera 12 and the optical axis O1 of the projection lens 11, reference can be made to Figure 9 As shown, the optical axis O2 of the ultra-short focus imaging camera 12 will be located above the plane where the bottom of the projection lens 11 is located. Since there will be a certain area between the projection lens 11 and the bottom of the projection screen 13, that is, the optical axis of the projection lens 11 is located below the bottom of the projection screen 13, the ultra-short focus imaging camera 12 is located outside the projection lens 11 at this time.

[0079] Combined with the above embodiments, Figure 10 FIG. is a schematic diagram of the positional relationship between an ultra-short focus imaging camera and a projection lens provided by an embodiment of the present application, and reference can be made to Figure 10 As shown. Except Figure 10 outside the external position where the ultra-short focus imaging camera 12 is located as shown, it can also be located in Figure 9 the area covered by the dotted line in

[0080] In summary, by limiting the vertical position of the ultra-short focus imaging camera 12, specifically, setting the distance F1 between the optical axis O1 of the projection lens 11 and the bottom of the projection screen 13 to be greater than the distance F2 between the optical axis O2 of the ultra-short focus imaging camera 12 and the optical axis O1 of the projection lens 11, the ultra-short focus imaging camera 12 can be further set to be located inside the projection lens 11.

[0081] An embodiment of the present application provides an ultra-short focus imaging camera 12. The ultra-short focus imaging camera 12 is located inside the projection lens 11 and includes a photosensitive module 121, a lens group 122, and a mirror module 123. The mirror module 123 is used to reflect the light beam emitted from the projection screen 13 to the lens group 122, so as to be incident on the photosensitive module 121 through the lens group 122, and the photosensitive module 121 is used to generate a corresponding image.

[0082] The specific architecture of the ultra-short focus imaging camera 12 can be referred to as shown in the above embodiments, and details are not described in detail here in the present application.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0084] For the sake of convenience of explanation, the above description has been made in connection with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be derived according to the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. A projection device, characterized in that, The projection device includes: A projection lens for projecting a projection image onto a projection screen; An ultra-short focus imaging camera located within the projection lens, including a photosensitive module, a lens group, and a mirror module. The mirror module is configured to reflect the light beam emitted from the projection screen to the lens group, so as to be incident on the photosensitive module through the lens group, and the photosensitive module is used to generate a corresponding image.

2. The projection device according to claim 1, characterized in that, The projection lens includes a first reflector bowl, and the distance from the first reflector bowl to the projection screen is greater than or equal to the distance from the mirror module to the projection screen.

3. The projection device according to claim 2, wherein The projection lens further includes a lens assembly, and the lens closest to the first reflector bowl in the lens assembly is the first lens; The length of the ultra-short focus imaging camera is less than the distance from the first reflector bowl to the first lens; wherein, the length of the ultra-short focus imaging camera is the distance between the photosensitive module and the mirror module.

4. The projection device according to claim 3, wherein, The sum of the distance from the first lens to the projection screen and the length of the ultra-short focus imaging camera is less than the distance from the mirror module to the projection screen.

5. The projection device according to claim 2, wherein, The projection lens further includes a lens assembly, and the lens closest to the first reflector bowl in the lens assembly is the first lens; The sum of the distance from the first lens to the projection screen and the length of the ultra-short focus imaging camera is greater than or equal to the distance from the mirror module to the projection screen.

6. The projection device according to claim 1, characterized in that The distance between the optical axis of the projection lens and the bottom of the projection screen is greater than the distance between the optical axis of the ultra-short focus imaging camera and the optical axis of the projection lens, and the bottom of the projection screen is the side close to the projection lens.

7. The projection device according to claim 1, characterized in that, The first projection ratio of the projection lens is greater than or equal to the second projection ratio of the ultra-short focus imaging camera.

8. The projection device according to any one of claims 1-7, characterized in that, The mirror module is a convex mirror, or a concave mirror, or a plane mirror.

9. The projection device according to claim 1, characterized in that, The projection device includes a second reflector bowl, wherein the first reflection area of the second reflector bowl is the first reflector bowl, and the second reflection area is the mirror module.

10. A ultra-short focus imaging camera, characterized in that, The ultra-short focus imaging camera is located within the projection lens, including a photosensitive module, a lens group, and a mirror module. The mirror module is configured to reflect the light beam emitted from the projection screen to the lens group, so as to be incident on the photosensitive module through the lens group, and the photosensitive module is used to generate a corresponding image.

Images