Projection attachment

Abstract

The present application relates to the technical field of photographing devices, and relates to a projection attachment. The projection attachment comprises an attachment body and a light-converging lens set. The front end surface of the attachment body is provided with an opening and is communicated with the internal space of the attachment body, so as to form a mounting cavity at the front end of the attachment body; the rear end surface of the attachment body is provided with a light outlet; and a light effect device for changing a light effect is provided inside the internal space between the light outlet and the opening. The light-converging lens set comprises a housing and light-converging lenses provided inside the housing; the light-converging lens set can enter the mounting cavity through the opening on the front end surface of the attachment body, and thus be accommodated in the mounting cavity, so that light emitted by a photographic lamp enters from the opening, then sequentially passes through the light-converging lens set inside the mounting cavity and the light effect device at the rear end, and is transmitted out from the light outlet. The light-converging lens set enters the mounting cavity through the opening of the front end of the attachment body, so that the technical problem of complicated detaching of light-converging lens sets of conventional projection attachments is solved.

Description

Projection tube

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 10, 2023, with application number 2023214824463 and invention name “Projection Tube”; and priority to the Chinese patent application filed with the China Patent Office on June 10, 2023, with application number 2023214760565 and invention name “Projection Tube”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of photographic equipment, and in particular to a projection tube. Background Art

[0003] To achieve a variety of lighting effects for photography and videography, more and more people are adding projection tubes to their video lights. However, as the power of today's video lights increases, the temperatures they generate are also increasing. Because the projection tube is installed on a video light, the light collecting lens assembly is relatively close to the video light. Therefore, after long-term use, the lenses in the light collecting lens assembly may crack due to heat exposure, necessitating replacement of the lenses in the light collecting lens assembly.

[0004] However, since the lenses in the traditional light-collecting mirror group are directly mounted on the outer shell of the projection tube, when the lenses need to be replaced, the outer shell of the entire projection tube needs to be disassembled. Since the structure of the projection tube is large and contains multiple components, the disassembly and assembly work is relatively cumbersome. This makes it inconvenient to replace the lenses of the light-collecting mirror group, affecting work efficiency.

[0005] Summary of the Invention

[0006] One purpose of the present application is to solve the technical problem that the disassembly of the light-collecting mirror assembly of a traditional projection tube is relatively complicated.

[0007] In order to solve the above technical problems, the present application provides a projection tube, comprising: a tube main body, a front end face of which is open and connected with its internal space to form an installation chamber at the front end of the tube main body, a light outlet is provided on the rear end face of the tube main body, and a light effect device for changing the light effect is provided in the internal space between the light outlet and the opening; a light receiving mirror group, comprising an outer shell and a light receiving lens arranged in the outer shell, the light receiving mirror group can enter along the opening on the front end face of the tube main body and be accommodated in the installation chamber; the light emitted by the photographic lamp enters from the opening, passes through the light receiving mirror group in the installation chamber and the light effect device at the rear end in turn, and is emitted from the light outlet.

[0008] Optionally, a rear positioning rib is provided on the outer wall of the shell, and the rear positioning rib is arranged at one end of the shell close to the tube body, and a first limiting portion is provided on the inner wall of the installation chamber of the tube body, which protrudes toward the axis of the tube body; when the light receiving mirror group is accommodated in the installation chamber, the first limiting portion abuts against the rear positioning rib.

[0009] Optionally, the first limiting portion includes a limiting rib and a convex ring, the limiting rib is protruded on the inner wall of the installation chamber of the cylinder body, the convex ring is arranged on the limiting rib, the limiting rib and the convex ring are arranged in steps along the axis of the cylinder body, the end face of the convex ring and the inner side wall of the positioning rib form a positioning cavity for accommodating the rear positioning rib, and the end face of the rear positioning rib is abutted against the end face of the convex ring, and the outer side surface of the rear positioning rib is abutted against the inner side wall of the limiting rib.

[0010] Optionally, the projection tube further comprises a bayonet, the bayonet is provided with a light-transmitting hole, the light-transmitting hole is arranged opposite to the light-collecting lens; the side of the bayonet facing the tube body is fixedly connected to the light-collecting lens group.

[0011] Optionally, the projection tube further includes a bayonet, and the bayonet and the light-collecting mirror group are separately arranged; the bayonet is detachably connected to the front end face opening of the tube body, and the bayonet abuts against the light-collecting mirror group to fix the light-collecting mirror group in the installation chamber; a light-transmitting hole is provided on the bayonet, and the light-transmitting hole is arranged opposite to the light-collecting mirror group.

[0012] Optionally, a front positioning rib is protruding from the outer wall of the shell, and the front positioning rib is arranged at one end of the shell close to the bayonet piece, and a accommodating cavity is provided on the side of the bayonet piece facing the light receiving mirror group, and the front end of the light receiving mirror group is connected to the accommodating cavity, and a second limiting portion is provided in the accommodating cavity, and the second limiting portion protrudes inward along the axial extension direction of the bayonet piece; the light receiving mirror group is accommodated in the installation chamber, and when the bayonet piece is connected to the tube body, the end face of the front positioning rib abuts against the second limiting portion.

[0013] Optionally, the projection tube further includes a fixing ring, which is provided on the outer shell and located between the front positioning rib and the second limiting portion of the bayonet member.

[0014] Optionally, the bayonet piece includes a bayonet body and a bayonet outer edge, the bayonet outer edge is arranged at one end of the bayonet body and extends radially along the bayonet body, a plurality of through holes are provided on the bayonet outer edge, the through holes are arranged opposite to the threaded holes on the front end surface of the tube body, and the screws can pass through the through holes and connect with the threaded holes to fix the bayonet piece on the front end surface of the tube body; a plurality of evenly distributed locking blocks are convexly provided on the outer side surface of the bayonet body, and the locking blocks are used to cooperate with the locking grooves on the photographic lamp to fix the photographic lamp on the projection tube.

[0015] Optionally, a fixing groove is provided on the end face of the bayonet piece facing the barrel body, and a fixing block is provided on the front end face of the barrel body facing the bayonet, and the fixing block is accommodated in the fixing groove so that the bayonet piece is docked on the barrel body at a set angle.

[0016] Optionally, the light receiving mirror group further includes a gasket, and a front positioning rib and / or a rear positioning rib are protruding from the outer side wall of the outer shell of the light receiving mirror group, and a sealing groove is opened on the outer side surface of the front positioning rib and / or the rear positioning rib, and the gasket is arranged in the sealing groove.

[0017] Optionally, the housing is further provided with heat dissipation fins, which are arranged circumferentially along the outer side surface of the housing, and a plurality of the heat dissipation fins are arranged at intervals along the axial direction of the housing.

[0018] Optionally, a first guide portion is provided on the inner side wall of the tube body corresponding to the installation chamber; a second guide portion adapted to the first guide portion is provided on the outer side surface of the outer shell of the light receiving mirror group; the light receiving mirror group is installed into the installation chamber from the opening of the tube body, and the second guide portion is adapted to be connected with the first guide portion, so that the light receiving mirror group is installed in the installation chamber at a fixed angle.

[0019] Optionally, the first guide portion is a groove structure arranged on the inner side wall of the cylinder body, and the groove structure extends along the axial direction of the cylinder body; the second guide portion is a boss structure protruding on the outer side wall of the shell, and the boss structure extends along the axial direction of the shell; and the second guide portion is adapted to the first guide portion.

[0020] Optionally, the first guide portion is a boss structure arranged on the inner side wall of the cylinder body and extends along the axial direction of the cylinder body; the second guide portion is a groove structure recessed on the outer side wall of the shell and extends along the axial direction of the shell; and the second guide portion is adapted to the first guide portion.

[0021] Optionally, at least two second guide parts are provided on the outer shell of the light-collecting mirror group; some of the second guide parts are boss structures, and the remaining second guide parts are groove structures; the boss structures and the groove structures are arranged at intervals along the circumference of the outer shell; the inner side wall of the tube body is provided with a groove structure corresponding to the boss structure on the outer shell and a boss structure corresponding to the groove structure on the outer shell.

[0022] Optionally, the cylinder body further includes a connecting plate and a support, the connecting plate being connected to the inner wall of the mounting chamber, the support being arranged on the connecting plate and protruding toward the axial direction of the cylinder body, and the first guide portion being arranged on the side of the support facing away from the connecting plate.

[0023] Optionally, a positioning plane is provided on one end of the outer shell of the light receiving mirror group facing the tube main body; a positioning block adapted to the positioning plane is provided in the tube main body, and when the light receiving mirror group is accommodated in the installation chamber, the positioning block abuts against the positioning plane, so that the light receiving mirror group and the installation chamber are docked at a fixed angle.

[0024] It can be seen from the above technical solution that the beneficial effects of this application are:

[0025] The present application provides a projection tube, comprising a tube body and a light-collecting lens group. The front end face of the tube body is open and communicates with its internal space, so as to form an installation chamber at the front end of the tube body. The light-collecting lens group can enter and be accommodated in the installation chamber along the opening on the front end face of the tube body. An opening is provided on the front end face of the tube body so that the light-collecting lens group can enter the installation chamber along the opening. When the light-collecting lens group is cracked or damaged, the light-collecting lens group can be replaced by simply removing it from the opening at the front end of the installation chamber. The operation is simple, and there is no need to disassemble other components on the tube body, which greatly improves the efficiency of replacing the light-collecting lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic front cross-sectional view of the projection tube in Example 1;

[0027] FIG2 is a partially enlarged structural schematic diagram of the projection tube in FIG1 ;

[0028] FIG3 is a schematic cross-sectional view of the main body of the projection tube in FIG1 ;

[0029] FIG4 is a schematic diagram of the exploded structure of the projection tube in FIG1 ;

[0030] FIG5 is a schematic side view of the projection tube in FIG1 ;

[0031] FIG6 is a schematic diagram of the three-dimensional structure of the light-collecting lens assembly of the projection tube in FIG1 ;

[0032] FIG7 is a diagram showing the connection between the light collecting lens assembly and the bayonet member of the projection tube in the second embodiment;

[0033] FIG8 is a schematic cross-sectional view of the entire light-collecting mirror assembly and the bayonet member in FIG7 ;

[0034] FIG9 is a half-section schematic diagram of the light collecting mirror assembly and the bayonet member in FIG7 ;

[0035] FIG10 is a schematic diagram of the three-dimensional structure of a projection tube according to the third embodiment;

[0036] FIG11 is a schematic diagram of the exploded structure of the projection tube in FIG10;

[0037] FIG12 is a side structural diagram of the projection tube body of FIG10;

[0038] FIG13 is a schematic front cross-sectional view of the projection tube in FIG10;

[0039] FIG14 is a schematic diagram of the three-dimensional structure of the light-collecting lens assembly of the projection tube in FIG11;

[0040] FIG15 is a schematic diagram of the three-dimensional structure of the connecting plate and the support platform of the projection tube in FIG11;

[0041] FIG16 is a schematic perspective structural diagram of the bayonet member of the projection tube in FIG11 ;

[0042] FIG17 is a perspective view of the structure of a light-collecting mirror assembly provided with a positioning plane;

[0043] FIG18 is a side view of the structure of the tube body that cooperates with the light collecting mirror assembly of FIG17;

[0044] FIG19 is a schematic cross-sectional view of a projection tube equipped with the light-collecting lens assembly shown in FIG17 ;

[0045] FIG20 is an enlarged schematic diagram of point A of the projection tube in FIG19;

[0046] FIG21 is a schematic diagram of the three-dimensional structure of a light-collecting mirror assembly of another structure;

[0047] FIG22 is a side view schematic diagram of the light collecting mirror assembly in FIG21;

[0048] FIG23 is a side view of a barrel body matched with the light collecting mirror assembly in FIG21;

[0049] FIG24 is a schematic diagram of the three-dimensional structure of a light-collecting mirror assembly of another structure;

[0050] FIG25 is a side view of the light collecting mirror assembly in FIG24;

[0051] FIG26 is a side view schematic diagram of the tube body matched with the light collecting mirror assembly in FIG24 .

[0052] The following are the descriptions of the reference numerals:

[0053] 100, projection tube; 101, opening; 102, light outlet; 103, light effect device; 10, tube body; 11, housing; 111, first housing; 112, second housing; 12, light effect assembly; 13, lens assembly; 14, mounting chamber; 15, first limiting portion; 151, limiting rib; 152, convex ring; 16, cooling fan; 17, first guide portion; 171, connecting plate; 172, support platform; 18, positioning block; 19, fixing block; 20, light collecting mirror assembly; 21. Housing; 22. Light-collecting lens; 221. Front light-collecting lens; 222. Rear light-collecting lens; 23. Positioning rib; 231. Front positioning rib; 232. Rear positioning rib; 25. Washer; 26. Heat dissipation fin; 27. Second guide portion; 28. Positioning plane; 30. Bayonet piece; 31. Bayonet body; 311. Light-transmitting hole; 312. Locking block; 32. Bayonet outer edge; 321. Through hole; 33. Second limiting portion; 34. Fixing groove; 40. Screw; 50. Fixing ring. DETAILED DESCRIPTION

[0054] Typical embodiments embodying the features and advantages of the present invention are described in detail in the following description. It should be understood that the present invention is capable of various variations in different embodiments without departing from the scope of the present invention, and that the descriptions and illustrations herein are intended to be illustrative rather than limiting.

[0055] In the description of this application, it should be understood that in the embodiments shown in the drawings, indications of directions or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions will also change accordingly.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0057] Example 1

[0058] Referring to Figures 1 to 6 , this embodiment provides a projection tube 100 comprising a tube body 10, a light-collecting lens assembly 20, and a bayonet 30. The bayonet 30 and the light-collecting lens assembly 20 are separate components. The light-collecting lens assembly 20 can be accommodated within the tube body 10, and the bayonet 30 is connected to the front end of the tube body 10.

[0059] It should be understood that in this embodiment, the front end refers to the end where the light of the photographic lamp enters the projection tube 100, and the rear end refers to the end where the light exits. That is, the end of the tube body 10 with the bayonet 30 is the front end, and the end away from the bayonet 30 is the rear end.

[0060] Referring to Figures 1 to 4 , the front end of the tube body 10 is opened 101 and communicates with its interior space, forming a mounting chamber 14 at the front end of the tube body 10. A light outlet 102 is provided on the rear end of the tube body 10. A light effect device 103 for changing the light effect is housed within the interior space between this light outlet 102 and the opening 101. Light emitted from the shadow lamp enters through the opening 101, passes through the light-receiving lens assembly 20 within the mounting chamber 14, and the light effect device 103 at the rear end, before exiting through the light outlet 102.

[0061] Specifically, referring to Figures 3 and 4 , the barrel body 10 of this embodiment includes a housing 11 and a light effect device 103. The light effect device 103 in this embodiment comprises a light effect assembly 12 and a lens assembly 13. The housing 11 defines a channel for light to pass through. Both the light effect assembly 12 and the lens assembly 13 are positioned within the channel to produce light effects on the light passing through it.

[0062] Among them, the light effect component 12 may include components such as an aperture and a slide that can change the light effect. The light effect component 12 can be inserted into the accommodating channel inside the shell 11 through the opening 101 on the shell 11, so that the light emitted by the photographic lamp can pass through the light effect component 12 in the accommodating channel and produce various lighting effects.

[0063] Continuing to refer to Figures 3 and 4, the housing 11 in this embodiment is composed of a first housing 111 and a second housing 112, which are slidably connected to each other. The accommodating channel at the front end of the first housing 111 in this embodiment forms an installation chamber 14 for accommodating the light receiving lens assembly 20. An opening 101 is provided on the front end surface of the first housing 111. The diameter of the opening 101 is larger than that of the light receiving lens assembly 20, allowing the light receiving lens assembly 20 to enter the installation chamber 14 through the opening 101.

[0064] A lens assembly 13 is housed within the accommodating channel of the second housing 112. This lens assembly 13 cooperates with the light-collecting lens assembly 20 to adjust the focal length of the projection tube. When the second housing 112 slides along the axis of the tube body 10, extending or retracting from the rear end of the first housing 111, the lens assembly 13 within the second housing 112 moves with it, changing the relative distance between the lens assembly 13 and the light-collecting lens assembly 20. This, in turn, alters the focal length of the projection tube 100, changing the effective optical distance of the projection tube 100.

[0065] 1 , 3 , and 6 , the light receiving lens assembly 20 includes a housing 21 and a light receiving lens 22 disposed within the housing 21. The light receiving lens assembly 20 can be inserted into the mounting chamber 14 of the barrel body 10 through an opening 101 on the front end surface of the barrel body 10 and secured to the mounting chamber 14 of the barrel body 10 via a bayonet 30, enabling rapid replacement of the light receiving lens assembly 20.

[0066] Referring to Figures 3 and 6 , the housing 21 of the light-collecting lens assembly 20 has openings 101 at both ends and a hollow interior, forming a truncated cone-shaped housing 21. Two light-collecting lenses 22 are located within the housing 21. The light-collecting lens 22 located at the front end of the housing 21 and having a smaller radius is referred to as the front light-collecting lens 221, while the light-collecting lens 22 located at the rear end of the housing 21 and having a larger radius is referred to as the rear light-collecting lens 222. Both the front light-collecting lens 221 and the rear light-collecting lens 222 are fixed within the hollow interior of the housing 21 to focus the light passing through.

[0067] This embodiment provides a method for securing the light receiving lens assembly 20 within the mounting chamber 14. As shown in Figures 1 and 4 , positioning ribs 23 are protruding from the outer wall of the housing 21 of the light receiving lens assembly 20. The barrel body 10 and the bayonet 30 are provided with corresponding stoppers that mate with the positioning ribs 23. The stoppers on the barrel body 10 and bayonet 30 abut against the positioning ribs 23 on the housing 21, thereby securing the light receiving lens assembly 20 within the mounting chamber 14 of the barrel body 10.

[0068] The outer shell 21 is set to be a truncated cone with one end larger than the other end, and the positioning rib 23 protruding from the outer shell 21 is abutted by the protruding bayonet 30 and the upper limit portion of the tube body 10 to fix the light receiving mirror group 20. The outer side of the outer shell 21 of the light receiving mirror group 20 and the inner side wall of the installation cavity 14 of the tube body 10 can form a spacing space, so that the heat dissipation effect of the light receiving mirror group 20 is better and the service life of the light receiving mirror group 20 is increased.

[0069] In some other embodiments, a groove or internal thread can be provided on the inner side wall of the installation chamber 14 of the tube body 10, and a slider or external thread can be provided on the outer side surface of the outer shell 21 of the light receiving mirror group 20, so that the light receiving mirror group 20 can be connected to the installation chamber 14 of the tube body 10 through the groove or thread, and then the bayonet 30 is used to block the opening 101 on the front end face of the tube body 10, so that the bayonet 30 is in contact with the end face of the light receiving mirror group 20, so that the light receiving mirror group 20 is fixed in the installation chamber 14 of the tube body 10, and the light receiving mirror group 20 can also be installed and fixed in the tube body 10.

[0070] Referring to Figures 2, 4, and 6, the positioning ribs 23 include a front positioning rib 231 and a rear positioning rib 232. The front positioning rib 231 is provided protrudingly on the front side of the housing 21 of the light receiving mirror assembly 20, while the rear positioning rib 232 is provided protrudingly on the rear side of the housing 21 of the light receiving mirror assembly 20. Correspondingly, the retaining member also includes a second retaining member 33 and a first retaining member 15. The second retaining member 33 is provided on the bayonet member 30 and is configured to abut against the front positioning rib 231. The first retaining member 15 is provided in the mounting chamber 14 of the barrel body 10 and is configured to abut against the rear positioning rib 232, thereby securing the light receiving mirror assembly 20 in the mounting chamber 14 and preventing it from moving along the axis of the barrel body 10.

[0071] Specifically, as shown in Figure 2, a front positioning rib 231 is provided on one end of the housing 21 near the bayonet 30. A housing cavity is defined on the side of the bayonet 30 facing the light-receiving lens assembly 20. Within this cavity is a second stopper 33, which protrudes inwardly along the axis of the bayonet 30. When the bayonet 30 is connected to the barrel body 10, the second stopper 33 abuts the front positioning rib 231 on the housing 21 of the light-receiving lens assembly 20, preventing the light-receiving lens assembly 20 from moving outward along the axis of the barrel body 10.

[0072] In this embodiment, the bayonet member 30 has an accommodating cavity on the side facing the light-receiving lens assembly 20. The front end of the light-receiving lens assembly 20 can be partially accommodated in the accommodating cavity. A second, annular, stopper 33 is provided around the bottom wall of the accommodating cavity, projecting along the axis of the bayonet member 30. When the bayonet member 30 is connected to the barrel body 10, the inwardly projecting second stopper 33 of the bayonet member 30 abuts against the front positioning rib 231 on the outer shell 21, retaining the light-receiving lens assembly 20 in the installation cavity 14.

[0073] Furthermore, as shown in FIG2 , a rear positioning rib 232 is provided at an end of the housing 21 away from the bayonet 30, and a first stopper 15 is provided on the inner sidewall of the installation chamber 14 of the barrel body 10, protruding toward the axis of the barrel body 10. When the light receiving lens assembly 20 enters through the opening 101 at the front end of the barrel body 10 and is accommodated in the installation chamber 14, the end surface of the rear positioning rib 232 on the housing 21 of the light receiving lens assembly 20 abuts against the end surface of the first stopper 15 protruding on the inner sidewall of the barrel body 10, preventing the light receiving lens assembly 20 from moving backward along the axis of the barrel body 10.

[0074] The second limiting portion 33 on the bayonet 30 abuts against the front positioning rib 231 on the outer shell 21, restricting the light receiving lens assembly 20 from moving outward along the axis of the barrel body 10. Then, the first limiting portion 15 on the barrel body 10 abuts against the rear positioning rib 232 on the outer shell 21, restricting the light receiving lens assembly 20 from moving inward along the axis of the barrel body 10, thereby securing the light receiving lens assembly 20 in the installation chamber 14 of the barrel body 10. This positioning method allows the light receiving lens assembly 20 to be quickly removed and replaced after the bayonet 30 is separated from the barrel body 10, thereby increasing the convenience of replacing the light receiving lens assembly 20.

[0075] It should be understood that the first limiting portion 15 is arranged around the inner wall of the tube body 10, and a light hole for light to pass through needs to be formed. The light hole is adapted to the rear light-collecting lens 222, so that the light can enter the light effect component 12 and the lens group 13 after passing through the bayonet part 30 and the light-collecting lens group 20.

[0076] Please continue to refer to Figures 2 and 4. In this embodiment, the first limiting portion 15 includes a limiting rib 151 and a convex ring 152. The limiting rib 151 and the convex ring 152 are arranged in a stepped manner to form a positioning cavity for accommodating the rear positioning rib 232 to position the rear positioning rib 232.

[0077] Specifically, the limiting rib 151 is protruding from the inner wall of the installation chamber 14 of the tube body 10, and the convex ring 152 is arranged on the side of the limiting rib 151 away from the inner wall. The convex ring 152 and the limiting rib 151 are arranged in a stepped manner, so that the inner wall of the convex ring 152 and the end face of the limiting rib 151 form a positioning cavity, and the positioning cavity faces the front end opening 101 of the tube body 10. When the light receiving mirror group 20 is accommodated in the installation chamber 14, the rear positioning rib 232 is accommodated in the positioning cavity. The rear end face of the rear positioning rib 232 abuts against the front end face of the convex ring 152, limiting the movement of the light receiving mirror group 20 toward the rear side of the tube body 10. The outer side face of the rear positioning rib 232 abuts against the inner wall of the limiting rib 151, limiting the movement of the light receiving mirror group 20 in the radial direction of the tube body 10.

[0078] A positioning cavity adapted to the rear positioning rib 232 is formed by the limiting rib 151 and the convex ring 152 to limit the position of the rear positioning rib 232, thereby limiting the axial and radial movement of the light receiving mirror group 20 along the tube body 10, preventing the light receiving mirror group 20 from shaking in the installation chamber 14, and better fixing the light receiving mirror group 20.

[0079] 1 to 4 , the bayonet member 30 is detachably connected to the front end surface of the tube body 10 , so that the bayonet member 30 abuts against the light receiving lens assembly 20 to fix the light receiving lens assembly 20 in the installation chamber 14 .

[0080] It should be understood that in this embodiment, the second stopper 33 on the bayonet member 30 abuts the front positioning rib 231 of the light receiving lens assembly 20 to retain the light receiving lens assembly 20 within the installation chamber 14. In other embodiments, the second stopper 33 and the front positioning rib 231 may not be provided, and retention may be achieved solely through direct abutment between the end surface of the bayonet member 30 and the end surface of the housing 21 of the light receiving lens assembly 20.

[0081] 4 , the bayonet member 30 includes a bayonet body 31 and a bayonet outer edge 32 . The bayonet outer edge 32 is disposed at one end of the bayonet body 31 and extends radially from the bayonet body 31 .

[0082] The outer edge 32 of the bayonet is provided with a plurality of through-holes 321, which are arranged opposite to the threaded holes on the end face of the barrel body 10. Screws 40 pass through the through-holes 321 and connect with the threaded holes to secure the bayonet 30 to the front face of the barrel body 10. Connecting the bayonet 30 to the barrel body 10 with screws 40 facilitates removal of the bayonet 30, thereby speeding up replacement of the light receiving lens assembly 20.

[0083] 2 and 4 , a light-transmitting hole 311 is formed on the bayonet body 31 . The light-transmitting hole 311 is aligned with the light-receiving lens 22 of the light-receiving lens assembly 20 for light to pass through.

[0084] The outer surface of the bayonet body 31 is also provided with a plurality of evenly distributed locking blocks 312. These locking blocks 312 are used to cooperate with the locking grooves on the photographic light to secure the photographic light to the projection tube 100. The locking blocks 312 cooperate with the locking grooves on the photographic light to achieve a detachable connection between the projection tube 100 and the photographic light, allowing the photographic light to be removed from the projection tube 100 at any time.

[0085] Referring to Figure 2 , the accommodating cavity of the bayonet member 30 is located on the side of the bayonet body 31 facing the light receiving lens assembly 20. A second stopper 33 protruding along the axis is provided on the bottom wall of the accommodating cavity. This second stopper 33 abuts against the end surface of a front positioning rib 231 on the housing 21 of the light receiving lens assembly 20. The sidewalls of the accommodating cavity abut against the outer sidewalls of the front positioning rib 231, thereby limiting radial movement of the light receiving lens assembly 20 and preventing it from shaking.

[0086] In some embodiments, referring to Figures 2 and 4 , the light collecting lens assembly 20 further includes a gasket 25 made of a silicone shock-absorbing material. Sealing grooves are formed on the outer sides of the front positioning rib 231 and the rear positioning rib 232 , and the gasket 25 is disposed within the sealing grooves.

[0087] Specifically, when the light receiving lens assembly 20 is housed in the installation chamber 14, the gasket 25, which fits within the sealing groove of the front positioning rib 231, abuts the inner sidewall of the housing chamber of the bayonet 30. The gasket 25, which fits within the sealing groove of the rear positioning rib 232, abuts the inner sidewall of the retaining rib 151 of the barrel body 10. The silicone gasket 25, which is mounted on the positioning rib 23, reduces radial movement of the light receiving lens assembly 20 within the barrel body 10, further stabilizing the light receiving lens assembly 20 within the installation chamber 14 and preventing damage to the positioning rib 23 from radial forces.

[0088] Referring to Figures 2 and 4 , in some embodiments, the projection tube 100 further includes a retaining ring 50 . The retaining ring 50 is sleeved onto the housing 21 and positioned between the front positioning rib 231 and the end surface of the second limiting portion 33 of the bayonet 30 . The retaining ring 50 is also made of silicone. Providing the retaining ring 50 on the abutment surface between the second limiting portion 33 and the front positioning rib 231 allows the second limiting portion 33 on the bayonet 30 to better abut the front positioning rib 231 and prevents stress damage to the front positioning rib 231 .

[0089] 1 and 2 , in some embodiments, the housing 21 of the light receiving lens assembly 20 is provided with heat dissipation fins 26. The heat dissipation fins 26 are disposed circumferentially along the outer surface of the housing 21, and a plurality of heat dissipation fins 26 are spaced apart along the axis of the housing 21 to form heat dissipation grooves.

[0090] A cooling fan 16 is also provided on the inner wall of the mounting chamber 14 of the tube body 10. This fan 16 generates a cooling airflow perpendicular to the internal passage of the tube body 10. This airflow flows through the heat dissipation slots on the light receiving lens assembly 20 and removes the heat from the slots through the air outlet on the tube body 10. The heat dissipation slots formed by the multiple heat dissipation fins 26 increase the heat dissipation area, thereby reducing the temperature of the light receiving lens assembly 20 and extending its service life.

[0091] The light-collecting lens assembly 20 in this embodiment is disposed at the front end of the first housing 111, close to the light source of the photographic lamp. It receives the greatest amount of light and heat, and prolonged use can cause cracking and damage to the light-collecting lens assembly 20. To reduce the number of steps required for assembly and disassembly of the light-collecting lens assembly 20 and improve replacement efficiency, an opening 101 is formed at the front end of the barrel body 10, and the opening 101 is connected to the interior space of the barrel body 10, forming an installation chamber 14. The light-collecting lens assembly 20 can enter and be accommodated in the installation chamber 14 along the opening 101 on the front end surface of the barrel body 10. When the light-collecting lens assembly 20 needs to be replaced, it is only necessary to remove the light-collecting lens assembly 20 from the installation chamber 14 using a card. Disassembly of the housing 11 of the projection barrel 100 is no longer necessary. No other components are involved in the operation, making it very simple and greatly improving the efficiency of replacing the light-collecting lens assembly 20.

[0092] Example 2

[0093] 7 to 9 , this embodiment provides another method for securing the light receiving lens assembly 20 within the mounting chamber 14. By integrating the light receiving lens assembly 20 and the bayonet member 30, the light receiving lens assembly 20 can be accommodated and secured within the mounting chamber 14 of the barrel body 10 when the bayonet member 30 is connected and secured to the front end of the barrel body 10.

[0094] Specifically, in this embodiment, the outer shell 21 of the light-receiving mirror group 20 is fixedly connected to the bayonet body 31 of the bayonet member 30 to form an integrated structure. When the bayonet outer edge 32 of the bayonet member 30 is connected to the front end surface of the tube body 10 by screws 40, the light-receiving mirror group 20 is correspondingly accommodated and fixed in the installation chamber 14 of the tube body 10.

[0095] Compared to the first embodiment, in which the bayonet member 30 is used to abut and position the light receiving mirror assembly 20 against the barrel body 10, the second embodiment adopts an integrally formed connection between the bayonet member 30 and the light receiving mirror assembly 20. This eliminates the need for a front positioning rib 231 or a second stopper 33 on the housing 21 of the light receiving mirror assembly 20, and also reduces the number of fixing rings 50 and washers 25 on the front positioning rib 231. The housing 21 of the light receiving mirror assembly 20 has a simpler structure.

[0096] When the light receiving lens assembly 20 needs to be replaced, it is only necessary to separate the bayonet member 30 from the barrel body 10, and then replace the light receiving lens assembly 20 and the bayonet member 30 together. The light receiving lens assembly 20 and the bayonet member 30 are configured as an integrated structure, which makes the replacement operation of the light receiving lens assembly 20 simpler, can further speed up the replacement of the light receiving lens assembly 20, and improve the user experience.

[0097] Example 3

[0098] For some traditional projection tubes 100, people can only determine the assembly position of the light-collecting lens group 20 based on their own experience. After the light-collecting lens group 20 is placed in the tube body 10, it is still necessary to fine-tune the position of the light-collecting lens group 20 to fix the light-collecting lens group 20 on the axis of the projection tube 100. This operation is relatively inconvenient and affects the assembly efficiency.

[0099] This embodiment provides a projection tube 100, as shown in Figures 10 to 26 , which includes a tube body 10 and a light-collecting lens assembly 20. By providing a first guide portion 17 within the tube body 10 and a second guide portion 27 on the light-collecting lens assembly 20 that matches the first guide portion 17, the light-collecting lens assembly 20 can be installed within the tube body 10 along a predetermined path and at a fixed angle.

[0100] When the light-receiving mirror assembly 20 enters the installation chamber 14 through the opening 101 on the front end surface of the barrel body 10, the second guide portion 27 of the light-receiving mirror assembly 20 engages with the first guide portion 17 of the installation chamber 14, so that the light-receiving mirror assembly 20 is installed in the installation chamber 14 at a set angle and the rotation of the light-receiving mirror assembly 20 in the installation chamber 14 is restricted. The cooperation between the first guide portion 17 and the second guide portion 27 enables the light-receiving mirror assembly 20 to be accurately positioned. During the replacement process of the light-receiving mirror assembly 20, there is no need to adjust its position, which is very simple to operate, greatly improving the efficiency of the installation work of replacing the light-receiving mirror assembly 20 and facilitating the maintenance and replacement of the light-receiving mirror assembly 20 by the staff.

[0101] In this embodiment, the front end refers to the end where the light of the photographic lamp enters the projection tube 100 , and the rear end refers to the end where the light exits.

[0102] Referring to Figures 10 to 13 , the front end of the tube body 10 has an opening 101 that communicates with the interior space, forming a mounting chamber 14 at the front end of the tube body 10. A light outlet 102 is provided on the rear end surface of the tube body 10, and a light effect device 103 for changing the light effect is located within the interior space between the light outlet 102 and the opening 101.

[0103] The specific structure of the barrel body 10 in this embodiment is the same as the internal structure of the barrel body 10 in the first embodiment, and will not be repeated here.

[0104] Referring to Figures 11 and 13 , the light-collecting lens assembly 20 can be inserted into the mounting chamber 14 of the tube body 10 through the opening 101 on the front end of the tube body 10. A first guide portion 17 is provided on the inner sidewall of the tube body 10 corresponding to the mounting chamber 14, while a second guide portion 27 is provided on the outer side of the housing 21 to mate with the first guide portion 17. When the first guide portion 17 and the second guide portion 27 engage and slide relative to each other, the light-collecting lens assembly 20 is mounted within the mounting chamber 14 at a set angle.

[0105] It should be understood that the first guide portion 17 and the second guide portion 27 may have various shapes, such as a slider and a slide rail, a boss and a slide groove, and other matching forms. As long as the first guide portion 17 and the second guide portion 27 are relatively aligned and positioned, the light receiving mirror assembly 20 can be installed in the installation chamber 14 along a predetermined path.

[0106] In this embodiment, referring to Figures 11, 14, and 15, the first guide portion 17 is a groove structure provided on the barrel body 10, extending along the axis of the barrel body 10. The second guide portion 27 is a boss structure provided on the outer wall of the housing 21, extending along the axis of the housing 21 and aligning with the groove structure. When the boss structure on the housing 21 slides along the groove structure in the barrel body 10, the light collecting lens assembly 20 slides along a predetermined path and is installed in the installation chamber 14.

[0107] As shown in Figure 14, when the second guide portion 27 is a boss structure, one side of the boss structure is connected to the outer shell 21, and the other side of the boss structure protrudes outward and is parallel to the axis of the barrel body 10, so that the boss structure can better connect with the groove structure formed by the first guide portion 17 on the barrel body 10.

[0108] 11 and 15 , in this embodiment, the cartridge body 10 further includes a connecting plate 171 and a support 172. The connecting plate 171 is connected to the inner sidewall of the mounting chamber 14. The support 172 is disposed on the connecting plate 171. The first guide portion 17 is disposed on the top surface of the support 172 facing away from the connecting plate 171. In this embodiment, the first guide portion 17 is a groove structure.

[0109] The connecting plate 171 has four connecting holes for securing to the inner sidewall of the tube body 10, securing it within the mounting chamber 14. A support 172 is provided on the connecting plate 171 and projects upward. As shown in Figure 12, the bottom surface of the groove structure on the upper surface of the support 172 is slightly higher than the sidewall of the opening 101 at the front end of the tube body 10. The boss structure on the outer shell 21 slidably cooperates with the groove structure within the tube body 10, allowing the light collecting lens assembly 20 to enter the mounting chamber 14 along a fixed path.

[0110] It is conceivable that the first guide portion 17 can be directly formed on the inner side wall of the tube body 10. When the shell 11 of the tube body 10 is manufactured, a groove structure extending along the tube body 10 is directly integrally formed on the inner side of the shell 11. This groove structure cooperates with the protrusion on the light receiving lens assembly 20 to achieve docking of the light receiving lens assembly 20.

[0111] In some other embodiments, referring to Figures 21 to 26, the positions of the groove structure and the boss structure can be interchanged, so that the groove structure is set on the outer shell 21 of the light receiving mirror assembly 20, and the boss structure is set on the inner side wall of the installation chamber 14 of the tube body 10.

[0112] For example, as shown in Figures 24 to 26 , the first guide portion 17 is a boss structure provided on the inner sidewall of the barrel body 10 and extending along the axis of the barrel body 10. The second guide portion 27 is a groove structure recessed in the outer shell 21 and extending along the axial direction of the outer shell 21. The groove structure on the outer shell 21 mates with the boss structure on the barrel body 10, and they slide relative to each other, allowing the light receiving lens assembly 20 to enter the installation chamber 14 of the barrel body 10 along a predetermined path.

[0113] In this case, the first guide portion 17 can still be provided on the top surfaces of the connecting plate 171 and the support 172, and connected to the upper surface of the support 172 away from the connecting plate 171 to form the first guide portion 17, so that it cooperates with the groove structure on the shell 21. Of course, the first guide portion 17 can also be directly provided on the inner side wall of the barrel body 10 and extend out of the side wall of the opening 101 on the front end surface of the barrel body 10.

[0114] In some other embodiments, the first guide portion 17 and the second guide portion 27 can be set to multiple accordingly, and a portion of the second guide portion 27 on the outer shell 21 is set to a boss structure, and the remaining portion of the second guide portion 27 on the outer shell 21 is set to a groove structure, and the boss structure and the groove structure are arranged at intervals along the circumference of the outer shell 21.

[0115] Correspondingly, a groove structure corresponding to the boss structure of the outer shell 21 and a boss structure corresponding to the groove structure of the outer shell 21 are provided on the inner side wall of the tube body 10, so that the boss structure and the groove structure on the light receiving mirror group 20 can slide along the groove structure and the boss structure in the tube body 10 to enter the installation chamber 14.

[0116] Of course, as shown in Figures 21 to 26 , the plurality of second guide portions 27 can all be configured as boss structures or groove structures, and correspondingly, the plurality of first guide portions 17 can also all be configured as groove structures or boss structures, so as to allow the light collecting lens assembly 20 to enter the installation cavity 14 of the barrel body 10 along a set path.

[0117] Referring to Figures 11 and 16 , the projection tube 100 of this embodiment further includes a bayonet member 30. The bayonet member 30 is detachably connected to the front end surface of the tube body 10 and abuts against the light-collecting lens assembly 20 to secure the light-collecting lens assembly 20 to the mounting chamber 14. A light-transmitting hole 311 is defined in the bayonet member 30. When the bayonet member 30 is connected to the tube body 10, the light-transmitting hole 311 is positioned opposite the light-collecting lens assembly 22, allowing light to pass smoothly through the projection tube 100.

[0118] Specifically, referring to Figures 11 and 16 , the bayonet member 30 includes a bayonet body 31 and a bayonet outer edge 32. The bayonet outer edge 32 is disposed at one end of the bayonet body 31 and extends radially from the bayonet body 31. The bayonet outer edge 32 is provided with a plurality of through holes 321. Screws 40 pass through the through holes 321 in the bayonet outer edge 32 and engage with threaded holes in the barrel body 10, thereby securing the bayonet member 30 to the front end surface of the barrel body 10.

[0119] As shown in FIG. 11 , a plurality of evenly distributed locking blocks 312 are convexly provided on the outer surface of the bayonet body 31 . The locking blocks 312 are used to cooperate with the locking grooves on the photographic light to fix the photographic light on the projection tube 100 .

[0120] In other embodiments, see Figures 16 and 18 , a fixing groove 34 is provided on the end surface of the bayonet member 30 facing the barrel body 10, and a fixing block 19 is provided on the front end surface of the barrel body 10 facing the bayonet. The fixing block 19 can be accommodated in the fixing groove 34, so that the bayonet member 30 is docked on the barrel body 10 at a set angle. The arrangement of the fixing block 19 and the fixing groove 34 can quickly and accurately fix the bayonet member 30 on the front end surface of the barrel body 10.

[0121] Referring to Figures 11, 14, and 19, in this embodiment, positioning ribs 23 are provided on the outer sidewalls at both ends of the housing 21. Positioning ribs 151 are provided on the bayonet member 30 and the barrel body 10 to cooperate with the positioning ribs 23. The positioning ribs 151 abut against the positioning ribs 23 to secure the light receiving lens assembly 20 within the mounting chamber 14 and limit the axial movement of the light receiving lens assembly 20 along the barrel body 10.

[0122] Specifically, as shown in Figure 14, two light-collecting lenses 22 of different radii are disposed within the interior of the housing 21. The positioning ribs 23 on the housing 21 include a front positioning rib 231 and a rear positioning rib 232. The front positioning rib 231 is located at the end closest to the bayonet 30, while the rear positioning rib 232 is located at the end further away from the bayonet 30.

[0123] As shown in Figures 16 and 19, a receiving groove is defined on the side of the bayonet body 31 of the bayonet member 30 that faces the barrel body 10. Within the receiving groove is a second stopper 33 that protrudes along the axis of the bayonet member 30. When the bayonet member 30 is connected to the front end of the barrel body 10, the second stopper 33 abuts against the front positioning rib 231 of the light receiving lens assembly 20, thereby limiting the forward movement of the light receiving lens assembly 20 along the axis of the barrel body 10.

[0124] As shown in Figures 2 and 10, a fixing ring 50 is further provided between the second limiting portion 33 and the front positioning rib 231 of this embodiment. The fixing ring 50 is made of silicone and is arranged on the abutting surface between the second limiting portion 33 and the front positioning rib 231, so that the second limiting portion 33 on the bayonet member 30 can better abut against the front positioning rib 231 and reduce the stress on the front positioning rib 231.

[0125] Referring to Figures 11 and 19 , a first stopper 15 is provided on the inner sidewall of the barrel body 10, protruding toward the axis. A protruding ring 152 is provided on the first stopper 15 to form a positioning cavity for accommodating the rear positioning rib 232 on the housing 21. The end surface of the rear positioning rib 232 abuts against the end surface of the protruding ring 152, thereby limiting the rearward movement of the light receiving lens assembly 20 along the axis of the barrel body 10.

[0126] As shown in FIG19 , a sealing groove is provided on the outer surface of the front positioning rib 231 and the rear positioning mirror. A silicone gasket is provided in the sealing groove to radially fix the light receiving mirror group 20 in the installation chamber 14 of the tube body 10, making the installation of the light receiving mirror group 20 more stable.

[0127] Please refer to FIG. 17 to FIG. 20 . In some other embodiments, the projection tube 100 is further provided with a positioning structure to further position the light-collecting lens assembly 20 and prevent the light-collecting lens assembly 20 from rotating within the tube body 10 .

[0128] As shown in Figures 17, 18, 21, and 24, a positioning flat surface 28 is provided on the end of the housing 21 of the light receiving lens assembly 20 that faces the barrel body 10. A positioning block 18 is provided within the barrel body 10 that mates with the positioning flat surface 28. When the light receiving lens assembly 20 is housed within the mounting chamber 14, the positioning block 18 abuts against the positioning flat surface 28, positioning the light receiving lens assembly 20 in the mounting chamber 14 and preventing the light receiving lens assembly 20 from rotating within the barrel body 10.

[0129] As shown in Figure 17 , the positioning plane 28 is provided on the rear positioning rib 232 of the housing 21. Accordingly, as shown in Figures 18 and 20 , the positioning block 18 within the barrel body 10 is provided on the inner sidewall of the positioning cavity of the first stopper 15 and protrudes toward the axis of the barrel body 10. This allows the rear positioning rib 232 on the light-receiving lens assembly 20 to mate with the positioning cavity of the first stopper 15 on the barrel body 10 at only one angle. Furthermore, the rear positioning rib 232 cannot rotate within the positioning cavity of the first stopper 15, further ensuring the proper positioning of the light-receiving lens assembly 20.

[0130] In this embodiment, a first guide portion 17 is provided on the inner side wall of the mounting chamber 14 of the barrel body 10 for guiding, and a second guide portion 27 is provided on the housing 21 of the light receiving lens assembly 20 to match the first guide portion 17. The second guide portion 27 slides along the first guide portion 17, so that the light receiving lens assembly 20 can slide into the mounting chamber 14 along a set path and at a fixed angle. During this process, the light receiving lens assembly 20 will not deviate. After the light receiving lens assembly 20 is assembled, it is no longer necessary to fine-tune the light receiving lens assembly 20. The operation is very simple, greatly improving the efficiency of replacing the light receiving lens assembly 20 and facilitating maintenance work for the staff.

[0131] While the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are intended to be illustrative and exemplary rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. All changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A projection tube, characterized in that: include: The tube body has a front end surface opened and connected to the internal space thereof, so as to form a mounting chamber at the front end of the tube body, a light outlet is arranged on the rear end surface of the tube body, and a light effect device for changing the light effect is arranged in the internal space between the light outlet and the opening; The light-collecting mirror group includes a shell and a light-collecting lens arranged in the shell. The light-collecting mirror group can enter along the opening on the front end surface of the tube body and be accommodated in the installation chamber. The light emitted by the photographic lamp enters from the opening, passes through the light-collecting mirror group in the installation chamber and the light effect device at the rear end in sequence, and is emitted from the light outlet.

2. The projection tube according to claim 1, characterized in that: A rear positioning rib is protruding on the outer wall of the shell, and the rear positioning rib is arranged at one end of the shell close to the tube body. A first limiting portion protruding toward the axis of the tube body is provided on the inner wall of the installation chamber of the tube body; when the light collecting mirror group is accommodated in the installation chamber, the first limiting portion abuts against the rear positioning rib.

3. The projection tube according to claim 2, characterized in that: The first limiting portion includes a limiting rib and a convex ring, the limiting rib is convexly disposed on the inner wall of the mounting chamber of the barrel body, the convex ring is disposed on the limiting rib, the limiting rib and the convex ring are arranged in steps along the axis of the barrel body, the end face of the convex ring and the inner side wall of the positioning rib form a positioning cavity for accommodating the rear positioning rib, and the end face of the rear positioning rib is abutted against the end face of the convex ring, and the outer side face of the rear positioning rib is abutted against the inner side wall of the limiting rib.

4. The projection tube according to claim 1, characterized in that: The projection tube also includes a bayonet, which is provided with a light-transmitting hole, and the light-transmitting hole is arranged opposite to the light-collecting lens; the side of the bayonet facing the tube body is fixedly connected to the light-collecting lens group.

5. The projection tube according to claim 1, characterized in that: The projection tube also includes a bayonet, which is separately arranged from the light-collecting lens group; the bayonet is detachably connected to the front end opening of the tube body, and the bayonet abuts against the light-collecting lens group to fix the light-collecting lens group in the installation chamber; a light-transmitting hole is provided on the bayonet, and the light-transmitting hole is arranged opposite to the light-collecting lens group.

6. The projection tube according to claim 5, characterized in that: A front positioning rib is protruding on the outer wall of the shell, and the front positioning rib is arranged at one end of the shell close to the bayonet piece. A accommodating cavity is provided on the side of the bayonet piece facing the light receiving mirror group. The front end of the light receiving mirror group is connected to the accommodating cavity. A second limiting portion is provided in the accommodating cavity, and the second limiting portion protrudes inwardly along the axial extension direction of the bayonet piece; the light receiving mirror group is accommodated in the installation chamber, and when the bayonet piece is connected to the tube body, the end face of the front positioning rib abuts against the second limiting portion.

7. The projection tube according to claim 6, characterized in that: The projection tube further comprises a fixing ring, which is arranged on the outer shell and located between the front positioning rib and the second limiting portion of the bayonet member.

8. The projection tube according to claim 4 or 5, characterized in that: The bayonet piece includes a bayonet body and a bayonet outer edge, the bayonet outer edge is arranged at one end of the bayonet body and extends radially out of the bayonet body, a plurality of through holes are arranged on the bayonet outer edge, the through holes are arranged opposite to the threaded holes on the front end surface of the tube body, screws can pass through the through holes and connect with the threaded holes to fix the bayonet piece on the front end surface of the tube body; a plurality of evenly distributed locking blocks are convexly provided on the outer side surface of the bayonet body, the locking blocks are used to cooperate with the locking grooves on the photographic lamp to fix the photographic lamp on the projection tube.

9. The projection tube according to claim 4 or 5, characterized in that: A fixing groove is provided on the end surface of the bayonet piece facing the barrel body, and a fixing block is provided on the front end surface of the barrel body facing the bayonet. The fixing block is accommodated in the fixing groove so that the bayonet piece can be docked on the barrel body at a set angle.

10. The projection tube according to claim 1, characterized in that: The light collecting mirror group also includes a gasket. A front positioning rib and / or a rear positioning rib are convexly provided on the outer side wall of the shell of the light collecting mirror group. A sealing groove is opened on the outer side surface of the front positioning rib and / or the rear positioning rib, and the gasket is arranged in the sealing groove.

11. The projection tube according to claim 1, characterized in that: The shell is also provided with heat dissipation fins, which are arranged around the circumference of the outer side surface of the shell, and a plurality of heat dissipation fins are arranged at intervals along the axial direction of the shell.

12. The projection tube according to claim 1, characterized in that: A first guide portion is provided on the inner side wall of the tube body corresponding to the installation chamber; a second guide portion matched with the first guide portion is provided on the outer side of the shell of the light receiving mirror group; the light receiving mirror group is installed into the installation chamber from the opening of the tube body, and the second guide portion is matched with the first guide portion, so that the light receiving mirror group is installed in the installation chamber at a fixed angle.

13. The projection tube according to claim 12, characterized in that: The first guide portion is a groove structure arranged on the inner side wall of the cylinder body, and the groove structure extends along the axial direction of the cylinder body; the second guide portion is a boss structure protruding on the outer side wall of the shell, and the boss structure extends along the axial direction of the shell; and the second guide portion is adapted to the first guide portion.

14. The projection tube according to claim 12, characterized in that: The first guide portion is a boss structure arranged on the inner side wall of the barrel body and extends along the axial direction of the barrel body; the second guide portion is a groove structure recessed on the outer side wall of the shell and extends along the axial direction of the shell; and the second guide portion is adapted to the first guide portion.

15. The projection tube according to claim 12, characterized in that: At least two second guide parts are provided on the housing of the light collecting mirror assembly; some of the second guide parts are boss structures, and the remaining second guide parts are groove structures; the boss structures and the groove structures are arranged at intervals along the circumference of the housing; The inner side wall of the barrel body is provided with a groove structure corresponding to the boss structure on the shell and a boss structure corresponding to the groove structure on the shell.

16. The projection tube according to any one of claims 13 to 15, characterized in that: The cylinder body also includes a connecting plate and a support, wherein the connecting plate is connected to the inner wall of the installation chamber, the support is arranged on the connecting plate and protrudes in the axial direction of the cylinder body, and the first guide portion is arranged on the side of the support away from the connecting plate.

17. The projection tube according to claim 12, characterized in that: A positioning plane is provided on one end of the outer shell of the light receiving mirror group facing the tube body; a positioning block adapted to the positioning plane is provided in the tube body, and when the light receiving mirror group is accommodated in the installation chamber, the positioning block abuts against the positioning plane, so that the light receiving mirror group and the installation chamber are docked at a fixed angle.

Images