Projector external lens assembly and projector

Abstract

The utility model belongs to the technical field of projection equipment, and discloses an external lens assembly of a projector and the projector, the external lens assembly of the projector comprises an external lens barrel and an imaging lens group installed in the external lens barrel, and the external lens barrel is provided with a connecting member; the connecting component comprises a first clamping part and a second clamping part which are oppositely arranged, and at least one of the first clamping part and the second clamping part is a movable fastener capable of being switched between a clamping position and an unlocking position. According to the utility model, the external lens cone can be installed through the connecting member and is matched with the projector in an external connection manner to realize projection of an imaging picture, and the clamping part I and the clamping part II of the connecting member can be installed on a projection lens or a shell of the projector in a clamping manner. Therefore, the influence of installation on the projection lens of the projector can be reduced, and the installation is more convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of projection equipment, and in particular relates to a projector external lens assembly and a projector. Background Art

[0002] With the rapid development of the projection industry, customers have gradually increased their acceptance of projection products and have more expectations, but at the same time they also have more demands on the projection picture, performance and functions.

[0003] In the prior art, in order to meet the demand for better projection effects, it is usually necessary to install some external auxiliary lenses on the projection lens of the projector to perform image processing such as amplification and dimming on the projected image. However, these auxiliary lenses are generally connected to the projection lens through a threaded structure, which results in the integration of the matching structure for connection on the projection lens, increasing the structural complexity and manufacturing difficulty of the projection lens. In addition, when the auxiliary lenses are twisted during installation, the projection lens is easily loosened, affecting the stability of the projection lens and the projection effect. Utility Model Content

[0004] In view of this, an object of the present invention is to provide a projector external lens assembly and a projector, which can make the installation of the external lens more convenient through the external connection method of snap connection, and reduce the impact on the projection lens.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] On the one hand, a projector external lens assembly is provided, including an external lens barrel and an imaging lens group installed in the external lens barrel, and a connecting component is arranged on the external lens barrel; the connecting component includes a clamping part 1 and a clamping part 2 which are arranged opposite to each other, and at least one of the clamping part 1 and the clamping part 2 is a movable fastener that can be switched between a locked position and an unlocked position.

[0007] Through the above technical solution, the external lens barrel with the molded lens installed can be installed through the connecting member, and the projected image can be processed in an external manner with the projector. The first and second clamping parts of the connecting member can be installed on the projection lens or the housing of the projector in a clamping manner, so that the impact of the installation on the projection lens of the projector can be reduced, and the installation is more convenient.

[0008] In a possible implementation, the movable fastener includes a buckle and a retaining member, the buckle is slidably or rotatably connected to the external lens barrel to switch between a locked position and an unlocked position, and the retaining member is arranged between the buckle and the external lens barrel to keep the buckle in the locked position.

[0009] Through the above technical solution, the buckle of the movable fastener can be switched between the locked position and the unlocked position by rotating or sliding, and the retaining component can maintain the buckle in the locked position to achieve the locking of the movable fastener, so that the external lens barrel can be locked to the projection lens or the projector housing through the locking part one and the locking part two.

[0010] In a possible implementation, the retaining member is an elastic return member connected between the buckle and the external lens barrel, or the retaining member is a damping member abutting between the buckle and the external lens barrel.

[0011] Through the above technical solution, the positioning and retention of the engagement can be achieved by using either an elastic reset member or a damping member.

[0012] In a possible implementation, the damping element is an elastic pad.

[0013] Through the above technical solution, the elastic pad acts as a damping pad to maintain the positioning of the buckle, and can also play a role in buffering and protection, thereby extending the service life.

[0014] In a possible implementation, the connecting member further includes a magnetic adsorption member disposed on the external lens barrel.

[0015] Through the above technical solution, while the connecting member is clamped by the clamping part 1 and the clamping part 2, the magnetic adsorption part can be magnetically adsorbed to the projector housing or projection lens housing made of metal material, thereby further improving the fixing effect of the external lens barrel.

[0016] In a possible implementation, a sealing gasket is provided on the end side of the external lens barrel for connecting with the projector.

[0017] Through the above technical solution, the sealing gasket can play a role in dust prevention and shielding the internal structure, and can improve the sealing and perform dust prevention and shielding functions when the external lens barrel is connected to the projection lens of the projector.

[0018] In a possible implementation, the external lens barrel is provided with a plurality of positioning columns distributed along the circumference to position and place the sealing gasket.

[0019] Through the above technical solution, the positioning column can serve as a positioning reference for the installation of the sealing gasket, and the positioning gasket can be accurately installed during installation, thereby also ensuring the sealing performance.

[0020] In a possible implementation, the imaging lens group includes a first lens and a second lens arranged from the magnification side to the reduction side, the optical focal length of the first lens is negative, the optical focal length of the second lens is positive, and the first lens is arranged off-axis relative to the second lens.

[0021] Through the above technical solution, the off-axis arrangement of the imaging lens group of the external lens, combined with the first lens with negative optical focal length and the second lens with positive optical focal length, can better assist imaging, improve the quality of the projected picture, and achieve auxiliary expansion and enhancement of the picture.

[0022] In a possible implementation, at least one of the first lens and the second lens is an aspheric lens, and a refractive index of the aspheric lens is greater than or equal to 1.48 and less than or equal to 1.8.

[0023] Through the above technical solution, setting an aspherical lens is beneficial to improving distortion and astigmatism. When the second lens group adopts an aspherical lens, it is beneficial to improve the edge resolution effect and improve the overall performance.

[0024] In a possible implementation, a pressure ring for limiting the first lens is connected to the end of the external lens barrel, and the second lens is fixed in the external lens barrel by glue spotting.

[0025] Through the above technical solution, the pressure ring can limit the first lens in the external lens barrel, and the second lens that is not fixed by the pressure ring can be fixed by glue. In this way, the external lens barrel is convenient for installing the imaging lens group and can be connected with the projection lens, and the structural design is more reasonable.

[0026] On the other hand, a projector is also provided, comprising a projector external lens assembly as described in any of the above technical solutions, wherein the external lens assembly and the projector lens are not coaxially arranged.

[0027] Through the above technical solution, the non-coaxial setting, that is, the designed imaging lens deviates from the original imaging optical axis of the projector, so that the projector can have the effect of assisting in improving the projection image and improving the image quality. Moreover, the non-coaxial setting of the first lens and the second lens is conducive to reducing the diameter and weight of the external lens, which is conducive to achieving a small size and reducing costs.

[0028] In a possible implementation, a sensing device is further included. After the external lens assembly is installed on the projector body, the projector automatically turns on the starry sky projection mode after the sensing device senses the external lens assembly.

[0029] Through the above technical solution, the installation status of the external lens assembly can be obtained through the sensing device, so that after the external lens assembly is installed, the projector can automatically turn on the starry sky projection mode, thereby improving the user experience.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] The utility model of the projector external lens assembly, the external lens barrel with the imaging lens group installed can be installed on the projector in an external manner through a connecting member, and the connecting member can accurately lock the external lens assembly on the shell of the projector in a snap-on manner through the cooperation of the first snap-on part and the second snap-on part, so that the shell can carry the external lens assembly, which can avoid setting a connecting structure on the projection lens and transfer the weight of the external lens assembly to the projector shell, avoiding the influence on the stability of the projection lens and the projection effect, and the installation is more convenient. Moreover, the imaging lens group can assist in expanding and enhancing the projection picture effect, and improve the picture projection effect.

[0032] The projector of the utility model can assist in expanding and enhancing the projection image quality through the projector external lens assembly, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A stereoscopic view of an external lens assembly of a projector at a first viewing angle;

[0034] Figure 2 A stereoscopic view of an external lens assembly of a projector at a second viewing angle;

[0035] Figure 3 It is a front view of an external lens assembly of a projector;

[0036] Figure 4 A cross-sectional view of an external lens barrel of an external lens assembly of a projector;

[0037] Figure 5 The figure is an exploded schematic diagram of an external lens assembly of a projector;

[0038] Figure 6 It is a schematic diagram of installing an imaging lens group of an external lens assembly of a projector in an external lens barrel;

[0039] Figure 7 The present invention is a structural schematic diagram of a projector.

[0040] In the figure: 1-external lens barrel; 11-first supporting platform; 12-second supporting platform; 13-pressure ring; 14-sealing pad; 15-positioning column; 2-connecting member; 21-extension portion; 22-flip buckle; 23-fixing fastener; 24-rotating shaft; 25-elastic pad; 26-slot; 27-magnet; 3-imaging lens group; 31-double concave lens; 32-double convex lens; 4-projector; 41-projection lens; 42-sensing device. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0042] Please refer to Figure 1-5 As shown, an embodiment of the present application provides a projector external lens assembly, including an external lens barrel 1 and an imaging lens group 3 installed in the external lens barrel 1, and a connecting member 2 is provided on the external lens barrel 1.

[0043] The imaging lens group 3 is used to optically process the projection screen or image of the projector 4. The processing method can be magnification, filtering, or other projection effects achieved by the existing lens combination. The external lens barrel 1 is used to install the imaging lens group 3, and the connecting member 2 provided on it can enable it to be installed on the projector 4.

[0044] In an embodiment of the present application, in order to enable the external lens barrel 1 to be installed on the projector 4 in a snap-fit ​​manner for easy installation, the connecting member 2 may include a snap-fit ​​portion 1 and a snap-fit ​​portion 2 that are relatively arranged, and at least one of the snap-fit ​​portion 1 and the snap-fit ​​portion 2 is a movable fastener that can be switched between a locked position and an unlocked position.

[0045] The first and second engaging parts of the connecting member 2 are arranged opposite to each other, wherein the first and second engaging parts cooperate with each other to form a connecting structure that can be mounted on a certain part of the projector 4, such as the housing of the projection lens 41, or on the projection lens 41, without limitation. At least one of the first and second engaging parts is a movable fastener, which can be switched between a locking position and an unlocking position to be unlocked and locked, so that it is easy to disassemble and assemble.

[0046] For example, one of the engaging part 1 and the engaging part 2 is a movable fastener, and the other is a fixed fastener 23. The fixed fastener 23 can play a positioning role. The fixed fastener 23 can be an L-shaped structure, and the movable fasteners cooperate with each other to lock or unlock.

[0047] Through the above technical solution, the external lens barrel 1 equipped with the molded lens can be installed through the connecting member 2, and the projected image can be processed in an external manner in conjunction with the projector 4. The first and second clamping parts of the connecting member 2 can be installed on the projection lens 41 or the housing of the projector 4 in a clamping manner, so that the impact of the installation on the projection lens 41 of the projector 4 can be reduced, and the installation is more convenient.

[0048] In one embodiment, the movable fastener includes a buckle and a retaining member, the buckle is slidably or rotatably connected to the external lens barrel 1 to switch between a locked position and an unlocked position, and the retaining member is arranged between the buckle and the external lens barrel 1 to keep the buckle in the locked position.

[0049] In this way, the buckle of the movable fastener can be switched between the locked position and the unlocked position by rotating or sliding, and the retaining component can maintain the buckle in the locked position to achieve the locking of the movable fastener, so that the external lens barrel 1 can be locked to the housing of the projector 4 or the projection lens 41 through the locking part one and the locking part two.

[0050] In the specific implementation process, the movable fastener is switched by rotating or sliding.

[0051] When the switch is performed by rotation, the buckle can be an L-shaped flip buckle 22, which is connected to the notch 26 on the side of the external lens barrel 1 by rotation through the shaft 24, and the flip buckle 22 is used to buckle with the side of the projector 4 or the side of the projection lens 41, so that the flip buckle 22 can be switched between the locked position and the unlocked position by rotating the shaft 24. In this structure, the retaining member can be a damping member abutting between the flip buckle 22 and the external lens barrel 1. Specifically, the damping member can be an elastic pad 25, which can be used as a damping pad to position and maintain the buckle, and can also play a role of buffering and protection, which can extend the service life, and the elastic pad 25 made of silicone material can be installed through the installation groove opened in the notch 26.

[0052] When the switch is performed by sliding, the buckle can be an L-shaped card plate, which is slidably connected to the side of the external lens barrel 1, and the retaining member allows the card plate to be retained in the locked position, so that the locked position and the unlocked position can be switched by moving the card plate. In this structure, the retaining member is an elastic reset member connected between the buckle and the external lens barrel 1, and the elastic reset member can make the card plate have a movement tendency to move toward the locked position. Specifically, the elastic reset key can be a spring.

[0053] In a preferred application scenario, the snap-fitting portion 1 and the snap-fitting portion 2 of the connecting member 2 are mounted on the outer shell of the projector 4 in a snap-fitting manner, that is, they are respectively snap-fitted on the opposite sides of the outer shell of the projector 4, and the weight of the external lens assembly is borne by the outer shell of the projector 4. This can avoid setting a connecting structure on the projection lens 41, and can also transfer the weight of the external lens assembly to the projector 4 shell, thereby avoiding affecting the stability of the projection lens 41 and the projection effect, and making installation more convenient.

[0054] In the above scenario, in order to ensure that the snap-fitting portion 1 and the snap-fitting portion 2 have a sufficiently long length to snap-fit ​​with the opposite sides of the projector 4 housing, the connecting member 2 also includes an extension portion 21 integrally formed with the external lens barrel 1, and the snap-fitting portion 1 or the snap-fitting portion 2 serving as a movable fastener is arranged at the end of the extension portion 21.

[0055] In order to further improve the fixing effect of the connecting member 2 on the projector 4 , the connecting member 2 further includes a magnetic adsorption member arranged on the external lens barrel 1 .

[0056] The magnetic adsorption member can be a magnet 27, which is installed on the side of the extension part close to the projector 4 through a hole groove, so that the external lens barrel 1 can be adsorbed and fixed to the projector 4 shell made of metal material through magnetic adsorption during installation.

[0057] In a specific implementation process, the external lens barrel 1 may also be provided with a sealing gasket 14 at the end side for connecting with the projector 4. The sealing gasket 14 can play a role in dust prevention and shielding the internal structure, and can improve the sealing performance and perform dust prevention and shielding when the external lens barrel 1 is connected with the projection lens 41 of the projector 4. Specifically, the sealing gasket 14 is made of PC material.

[0058] On this basis, in order to facilitate accurate installation of the sealing gasket 14, the external lens barrel 1 is provided with a plurality of positioning posts 15 distributed along the circumference to position and place the sealing gasket 14. The positioning posts 15 can serve as a positioning reference for the installation of the sealing gasket 14, and can accurately install the positioning gasket when installing it, thereby also ensuring the sealing performance.

[0059] In a preferred embodiment of the molding lens group, the imaging lens group 3 includes a first lens and a second lens arranged from the magnification side to the reduction side, the optical focal length of the first lens is negative, the optical focal length of the second lens is positive, and the first lens is arranged off-axis relative to the second lens.

[0060] The imaging lens group 3 of the external lens is in an off-axis state relative to the projection lens 41 of the projector 4, that is, the designed imaging lens deviates from the original imaging optical axis of the projector 4, and through the first lens with negative focal length and the second lens with positive focal length, it can better assist imaging, improve the quality of the projected image, and achieve auxiliary expansion and enhancement of the image. Specifically, by setting the first lens with negative focal length, the first lens plays a role in magnifying the angle of the light, thereby achieving magnification of the projected image, and at the same time is conducive to correcting distortion; by setting the second lens with positive focal length, the second lens plays a role in converging the light of the projection lens, and at the same time plays a role in correcting chromatic aberration and controlling the beam aperture.

[0061] Specifically, the off-axis arrangement can be achieved by an oblique design of the mounting hole of the external lens; it can also be achieved by staggering the internal mounting positions in the axial direction, for example, by staggering the first supporting platform 11 for mounting the first lens and the second supporting platform 12 for mounting the second lens in the external lens barrel 1.

[0062] On this basis, there are many ways to match the first lens and the second lens to improve the quality of the projected image.

[0063] One matching method is that at least one of the first lens and the second lens is an aspherical lens, and the refractive index of the aspherical lens is greater than or equal to 1.48 and less than or equal to 1.8. The aspherical lens is helpful to improve distortion and astigmatism. When the second lens group adopts an aspherical lens, it is helpful to improve the edge resolution effect and improve the overall performance.

[0064] Another matching method is that the first lens can be a biconcave lens 31, and the second lens can be a biconvex lens 32. Such a lens combination can improve and enhance the projection image quality in an off-axis arrangement.

[0065] At the same time, in order to realize the installation of the first lens and the second lens, the end of the external lens barrel 1 is connected with a pressing ring 13 for limiting the position of the first lens, and the second lens is fixed in the external lens barrel 1 by glue. The pressing ring 13 is threadedly connected to the external lens barrel, which can limit the position of the first lens in the external lens barrel, and the second lens that is not fixed by the pressing ring can be fixed by glue, so that the external lens barrel is convenient for installing the imaging lens group and can also be connected with the projection lens 41, and the structural design is more reasonable.

[0066] Please refer to Figure 7 As shown, an embodiment of the present application further provides a projector, comprising an external lens assembly of the projector 4 as described in any one of the above items, wherein the external lens assembly and the lens of the projector 4 are non-coaxially arranged.

[0067] The non-coaxial setting means that the designed imaging lens deviates from the original imaging optical axis of the projector 4, so that the projector 4 can have the effect of assisting in improving the projection image and improving the image quality. Moreover, by setting the first lens and the second lens to be non-coaxial, it is helpful to reduce the diameter and weight of the external lens, which is conducive to achieving a small size and reducing costs.

[0068] In order to improve the user experience, a sensing device 42 may be further provided. After the external lens assembly is installed on the projector 4 body, the sensing device 42 senses the external lens assembly, and the projector 4 automatically turns on the starry sky projection mode.

[0069] The sensing device 42 can be an infrared sensor, which sends a feedback signal to the control module of the projector 4 by sensing the installation status of the external lens assembly. After receiving the feedback signal, the projector 4 starts the starry sky projection mode and projects the starry sky. This mode is a function of the existing projector 4 and will not be described in detail here.

[0070] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention. The protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A projector external lens assembly, characterized in that: The invention comprises an external lens barrel (1) and an imaging lens group (3) installed in the external lens barrel (1), wherein a connecting component (2) is arranged on the external lens barrel (1); the connecting component (2) comprises a first clamping part and a second clamping part arranged opposite to each other, and at least one of the first clamping part and the second clamping part is a movable fastener capable of switching between a locking position and an unlocking position.

2. A projector external lens assembly as claimed in claim 1, characterized in that: The movable fastener comprises a buckle and a retaining member, the buckle is slidably or rotatably connected to the external lens barrel (1) to switch between a locked position and an unlocked position, and the retaining member is arranged between the buckle and the external lens barrel (1) to keep the buckle in the locked position.

3. A projector external lens assembly as claimed in claim 2, characterized in that: The retaining member is an elastic reset member connected between the buckle and the external lens barrel (1), or the retaining member is a damping member abutting between the buckle and the external lens barrel (1).

4. A projector external lens assembly as claimed in claim 3, characterized in that: The damping element is an elastic pad (25).

5. The projector external lens assembly according to claim 1, characterized in that: The connecting component (2) also includes a magnetic adsorption component arranged on the external lens barrel (1).

6. The projector external lens assembly according to claim 1, characterized in that: A sealing gasket (14) is provided on the end side of the external lens barrel (1) for connecting with the projector (4).

7. A projector external lens assembly as claimed in any one of claims 1 to 6, characterized in that: The imaging lens group (3) comprises a first lens and a second lens arranged from the magnification side to the reduction side, the optical focal length of the first lens is negative, the optical focal length of the second lens is positive, and the first lens is arranged off-axis relative to the second lens.

8. The projector external lens assembly as claimed in claim 7, characterized in that: At least one of the first lens and the second lens is an aspherical lens, and a refractive index of the aspherical lens is greater than or equal to 1.48 and less than or equal to 1.

8.

9. The projector external lens assembly as claimed in claim 7, characterized in that: A pressing ring (13) for limiting the position of the first lens is connected to the end of the external lens barrel (1), and the second lens is fixed in the external lens barrel (1) by glue spotting.

10. A projector, characterized in that: It comprises an external lens assembly for a projector (4) as claimed in any one of claims 1 to 9, wherein the external lens assembly and the lens of the projector (4) are non-coaxially arranged.

11. A projector as claimed in claim 10, characterized in that: It also comprises a sensing device (42). After the external lens assembly is installed on the main body of the projector (4), the sensing device (42) senses the external lens assembly, and the projector (4) automatically turns on the starry sky projection mode.

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