WO2024255516A1 - Projection attachment - Google Patents

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

This application claims the priority of the Chinese patent application filed with the China Patent Office on June 10, 2023, with application number 2023214824463 and invention name “Projection Tube”; and the priority of the Chinese patent application filed with the China Patent Office on June 10, 2023, with application number 2023214760565 and invention name “Projection Tube”, all contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the technical field of photographic equipment, and in particular to a projection tube.

Background Art

In order to achieve various photography and videography lighting effects, more and more people will install projection tubes on photography lights. As the power of photography lights is getting higher and higher, the temperature they generate is also getting higher. After the projection tube is installed on the photography light, its light collecting lens group is relatively close to the photography light. Therefore, after long-term use, the lenses in the light collecting lens group may crack due to heat, so the lenses in the light collecting lens group need to be replaced.

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.

Summary of the invention

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

In order to solve the above technical problems, the present application provides a projection tube, comprising: a tube main body, whose front end face 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 collecting mirror group, comprising an outer shell and a light collecting lens arranged in the outer shell, the light collecting 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 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.

Optionally, 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, and 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.

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 barrel 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 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 surface of the rear positioning rib is abutted against the inner side wall of the limiting rib.

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.

Optionally, the projection tube further comprises a bayonet piece, and the bayonet piece and the light collecting lens group are separately arranged; the bayonet piece is detachably connected to the front end face opening of the tube body, and the bayonet piece 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 piece, and the light-transmitting hole is arranged opposite to the light collecting lens group.

Optionally, 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.

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

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.

Optionally, 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, 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.

Optionally, the light collecting mirror group also includes a gasket, and a front positioning rib and/or a rear positioning rib are convexly provided on the outer side wall of the outer shell of the light collecting 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.

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

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 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 from the opening of the tube body to the installation chamber, 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.

Optionally, the first guide portion is a groove structure arranged on the inner side wall of the barrel body, and the groove structure extends along the axial direction of the barrel 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.

Optionally, 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.

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; and 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.

Optionally, the tube body further includes a connecting plate and a support, wherein the connecting plate is connected to the inner wall of the mounting chamber, the support is arranged on the connecting plate and protrudes in the axial direction of the tube body, and the first guide portion is arranged on the side of the support away from the connecting plate.

Optionally, 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.

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

The present application provides a projection tube, including a tube body and a light-collecting lens group. The front end face of the tube body is open and communicated 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 and damaged, the light-collecting lens group can be replaced by simply taking it out 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 work efficiency of replacing the light-collecting lens group.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a front cross-sectional structure of a projection tube in Embodiment 1;

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

FIG3 is a schematic cross-sectional structure diagram of a tube body of the projection tube in FIG1 ;

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

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

FIG6 is a schematic diagram of the three-dimensional structure of the light collecting mirror group of the projection tube in FIG1;

FIG. 7 is a diagram showing the connection between the light collecting lens assembly and the bayonet member of the projection tube in the second embodiment;

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

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

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

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

FIG12 is a schematic side view of the structure of the projection tube body of FIG10;

FIG13 is a schematic diagram of a front cross-sectional structure of the projection tube in FIG10;

FIG14 is a schematic diagram of the three-dimensional structure of the light collecting mirror group of the projection tube in FIG11;

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

FIG16 is a schematic diagram of the three-dimensional structure of the bayonet member of the projection tube in FIG11;

FIG17 is a three-dimensional structural view of a light collecting mirror assembly provided with a positioning plane;

FIG18 is a schematic side view of the structure of the tube body matched with the light collecting mirror assembly of FIG17;

FIG19 is a schematic cross-sectional view of a projection tube equipped with the light collecting mirror assembly in FIG17;

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

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

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

FIG23 is a side view schematic diagram of a tube body matched with the light collecting mirror assembly in FIG21;

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

FIG25 is a side view schematic diagram of the light collecting mirror assembly in FIG24;

FIG. 26 is a schematic side view of a tube body matched with the light collecting mirror assembly in FIG. 24 .

The following are the descriptions of the reference numerals:

100, projection tube; 101, opening; 102, light outlet; 103, light effect device; 10, tube body; 11, shell; 111, first shell; 112, second shell; 12, light effect assembly; 13, lens group; 14, installation chamber; 15, first limiting part; 151, limiting rib; 152, convex ring; 16, cooling fan; 17, first guide part; 171, connecting plate; 172, support platform; 18, positioning block; 19, fixing block; 20, light collecting mirror group; 21. Shell; 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-dissipating 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

Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and 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 also change accordingly.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

Embodiment 1

Referring to FIGS. 1 to 6 , this embodiment provides a projection tube 100, including a tube body 10, a light collecting lens group 20, and a bayonet 30. The bayonet 30 and the light collecting lens group 20 adopt a split structure. The light collecting lens group 20 can be accommodated on the tube body 10, and the bayonet 30 is connected to the front end of the tube body 10.

It should be understood that the front end in this embodiment 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.

Referring to FIGS. 1 to 4 , the front end opening 101 of the tube body 10 is connected to the internal space thereof, so as to form an installation 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 provided in the internal space between the light outlet 102 and the opening 101. After the light emitted by the shadow lamp enters from the opening 101, it passes through the light receiving lens group 20 in the installation chamber 14 and the light effect device 103 at the rear end in sequence, and is emitted from the light outlet 102.

Specifically, referring to FIG. 3 and FIG. 4 , the barrel body 10 of this embodiment includes a housing 11 and a light effect device 103. The light effect device 103 of this embodiment is a light effect component 12 and a lens group 13. The housing 11 is provided with a receiving channel for light to pass through, and the light effect component 12 and the lens group 13 are both provided in the receiving channel of the housing 11 to perform light effect processing on the light passing through the receiving channel.

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 in 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.

Please continue to refer to Figures 3 and 4. In this embodiment, the housing 11 is composed of a first housing 111 and a second housing 112, and the first housing 111 is slidably connected to the second housing 112. The accommodating channel structure at the front end of the first housing 111 of this embodiment forms an installation chamber 14 for accommodating the light receiving lens group 20, and an opening 101 is provided on the front end surface of the first housing 111. The diameter of the opening 101 is larger than the diameter of the light receiving lens group 20, so that the light receiving lens group 20 can enter the installation chamber 14 from the opening 101.

A lens group 13 is disposed in the receiving channel in the second housing 112, and the lens group 13 cooperates with the light collecting lens group 20 to adjust the focal length of the projection tube. When the second housing 112 slides along the axis direction of the tube body 10 to extend or retract at the rear end of the first housing 111, the lens group 13 in the second housing 112 moves along with the second housing 112, changing the relative distance between the lens group 13 and the light collecting lens group 20, thereby changing the focal length of the projection tube 100, and changing the light effect distance of the projection tube 100.

1, 3 and 6, the light collecting lens group 20 includes a housing 21 and a light collecting lens 22 disposed in the housing 21. The light collecting lens group 20 can enter the installation chamber 14 of the barrel body 10 along the opening 101 on the front end surface of the barrel body 10, and the light collecting lens group 20 can be fixed in the installation chamber 14 of the barrel body 10 by the bayonet 30, so as to realize the rapid replacement of the light collecting lens group 20.

Please refer to FIG. 3 and FIG. 6 , the housing 21 of the light collecting lens group 20 has openings 101 at both ends and is hollow inside, forming a truncated cone-shaped housing 21. Two light collecting lenses 22 are arranged inside the housing 21. The light collecting lens 22 located at the front end of the housing 21 and having a smaller radius is the front light collecting lens 221, and the light collecting lens 22 located at the rear end of the housing 21 and having a larger radius is the rear light collecting lens 222. Both the front light collecting lens 221 and the rear light collecting lens 222 are fixed inside the hollow of the housing 21 to collect the passing light.

In this embodiment, a method for fixing the light collecting mirror assembly 20 in the installation chamber 14 is provided. As shown in FIG. 1 and FIG. 4 , a positioning rib 23 is convexly provided on the outer wall of the outer shell 21 of the light collecting mirror assembly 20. The barrel body 10 and the bayonet member 30 are correspondingly provided with a limiting portion that matches the positioning rib 23. The limiting portion on the barrel body 10 and the bayonet member 30 abuts against the positioning rib 23 on the outer shell 21 to fix the light collecting mirror assembly 20 in the installation chamber 14 of the barrel body 10, thereby achieving the fixing of the light collecting mirror assembly 20.

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

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

Please refer to Figures 2, 4 and 6. The positioning rib 23 includes a front positioning rib 231 and a rear positioning rib 232. The front positioning rib 231 is convexly arranged on the front side of the housing 21 of the light receiving mirror assembly 20, and the rear positioning rib 232 is convexly arranged on the rear side of the housing 21 of the light receiving mirror assembly 20. Correspondingly, the limiting portion also includes a second limiting portion 33 and a first limiting portion 15. The second limiting portion 33 is arranged on the bayonet member 30, and is used to abut against the front positioning rib 231; the first limiting portion 15 is arranged in the installation chamber 14 of the barrel body 10, and is used to abut against the rear positioning rib 232, so that the light receiving mirror assembly 20 It is fixed in the installation chamber 14 and cannot move along the axis of the cartridge body 10 .

Specifically, as shown in FIG. 2 , the front positioning rib 231 is disposed at one end of the housing 21 close to the bayonet 30. A receiving cavity is provided on the side of the bayonet 30 facing the light receiving lens group 20, and a second limiting portion 33 is provided in the receiving cavity. The second limiting portion 33 protrudes inwardly along the axis direction of the bayonet 30. When the bayonet 30 is connected to the barrel body 10, the second limiting portion 33 abuts against the front positioning rib 231 on the housing 21 of the light receiving lens group 20, so that the light receiving lens group 20 cannot move outward along the axis of the barrel body 10.

The bayonet member 30 of this embodiment is provided with a receiving cavity on the side facing the light receiving lens group 20, and the front end of the light receiving lens group 20 can be partially received in the receiving cavity. A second stopper 33 protruding along the axis of the bayonet member 30 is provided around the bottom wall of the receiving cavity, and the second stopper 33 is in a circular ring shape. When the bayonet member 30 is connected to the barrel body 10, the second stopper 33 protruding inwardly on the bayonet member 30 abuts against the front positioning rib 231 on the housing 21, so as to stop the light receiving lens group 20 in the installation chamber 14.

Further, as shown in FIG2 , the rear positioning rib 232 is disposed at one end of the housing 21 away from the bayonet 30, and the inner side wall of the installation chamber 14 of the barrel body 10 is provided with a first stopper 15 protruding toward the axis of the barrel body 10. When the light collecting lens assembly 20 enters from the opening 101 on the front end surface 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 collecting lens assembly 20 abuts against the end surface of the first stopper 15 protruding on the inner side wall of the barrel body 10, so that the light collecting lens assembly 20 cannot move backward along the axis of the barrel body 10.

The second limiting portion 33 on the bayonet 30 abuts against the front positioning rib 231 on the housing 21 to limit the light collecting lens group 20 from moving outward along the axis of the barrel body 10, and then the first limiting portion 15 on the barrel body 10 abuts against the rear positioning rib 232 on the housing 21 to limit the light collecting lens group 20 from moving inward along the axis of the barrel body 10, and the light collecting lens group 20 is limited in the installation chamber 14 of the barrel body 10. With this positioning method, the light collecting lens group 20 can be quickly removed and replaced after the bayonet 30 is separated from the barrel body 10, which increases the convenience of replacing the light collecting lens group 20.

It should be understood that the first limiting portion 15 is arranged on the inner wall of the tube body 10 to form a light-through hole for light to pass through. The light-through 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 30 and the light-collecting lens group 20.

Please continue to refer to Figures 2 and 4. The first limiting portion 15 in this embodiment 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.

Specifically, the limiting rib 151 is convexly arranged on the inner side wall of the installation chamber 14 of the barrel body 10, and the convex ring 152 is arranged on the side of the limiting rib 151 away from the inner side wall. The convex ring 152 and the limiting rib 151 are arranged in a stepped manner, so that the inner side 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 barrel 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 to the rear side of the barrel body 10. The outer side face of the rear positioning rib 232 abuts against the inner side wall of the limiting rib 151, limiting the movement of the light receiving mirror group 20 in the radial direction of the barrel body 10.

A positioning cavity matched with 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.

Please refer to FIGS. 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 collecting lens group 20 , and the light collecting lens group 20 is fixed in the installation chamber 14 .

It should be understood that in this embodiment, the second limiting portion 33 on the bayonet member 30 abuts against the front positioning rib 231 of the light collecting lens assembly 20. To stop the light collecting mirror assembly 20 in the installation chamber 14. In some other embodiments, the second limiting portion 33 and the front positioning rib 231 may not be provided, and the light collecting mirror assembly 20 may be stopped only by directly contacting the end surface of the bayonet member 30 with the end surface of the housing 21 of the light collecting mirror assembly 20.

In this embodiment, referring to FIG4 , 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 .

A plurality of through holes 321 are provided on the outer edge 32 of the bayonet, which are arranged opposite to the threaded holes on the end surface of the barrel body 10. The screws 40 pass through the through holes 321 and are connected to the threaded holes to fix the bayonet member 30 on the front end surface of the barrel body 10. The bayonet member 30 is connected to the barrel body 10 by the screws 40, which can facilitate the disassembly of the bayonet member 30, thereby speeding up the replacement of the light collecting lens group 20.

Please refer to FIG. 2 and FIG. 4 . A through light hole 311 is formed on the bayonet body 31 . The light hole 311 is aligned with the light collecting lens 22 of the light collecting lens assembly 20 for light to pass through.

A plurality of evenly distributed locking blocks 312 are also convexly provided on the outer surface of the bayonet body 31, and the locking blocks 312 are used to cooperate with the locking grooves on the photographic lamp to fix the photographic lamp on the projection tube 100. By cooperating between the locking blocks 312 and the locking grooves on the photographic lamp, a detachable connection between the projection tube 100 and the photographic lamp is achieved, so that the photographic lamp can be removed from the projection tube 100 at any time.

Please refer to FIG. 2 , the accommodating cavity of the bayonet member 30 is arranged on the side of the bayonet body 31 facing the light receiving lens group 20, and a second limiting portion 33 protruding along the axis is arranged on the bottom wall of the accommodating cavity, and the second limiting portion 33 abuts against the end surface of the front positioning rib 231 on the housing 21 of the light receiving lens group 20. The side wall of the accommodating cavity abuts against the outer side wall of the front positioning rib 231, so as to limit the movement of the light receiving lens group 20 along the radial direction of the bayonet member 30 and prevent the light receiving lens group 20 from shaking.

In some embodiments, referring to Figures 2 and 4, the light collecting lens assembly 20 further includes a gasket 25, which is made of a silicone shock absorbing material. A sealing groove is provided on the outer side of the front positioning rib 231 and the rear positioning rib 232, and the gasket 25 is disposed in the sealing groove.

Specifically, when the light collecting lens group 20 is accommodated in the installation chamber 14, the gasket 25 sleeved in the sealing groove of the front positioning rib 231 abuts against the inner side wall of the accommodation chamber of the bayonet 30. The gasket 25 sleeved in the sealing groove of the rear positioning rib 232 abuts against the inner side wall of the limiting rib 151 of the barrel body 10. The silicone gasket 25 arranged on the positioning rib 23 can reduce the shaking of the light collecting lens group 20 in the radial direction of the barrel body 10, making the light collecting lens group 20 more stable in the installation chamber 14, and preventing the positioning rib 23 from being damaged by radial force.

Referring to FIG. 2 and FIG. 4 , in some embodiments, the projection tube 100 further includes a fixing ring 50. The fixing ring 50 is sleeved on the housing 21 and is located between the front positioning rib 231 and the end surface of the second limiting portion 33 of the bayonet member 30. The fixing ring 50 is also made of silicone material. The fixing ring 50 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 the front positioning rib 231 and prevent stress damage to the front positioning rib 231.

1 and 2 , in some embodiments, the housing 21 of the light collecting lens assembly 20 is provided with heat dissipation fins 26. The heat dissipation fins 26 are arranged circumferentially along the outer side of the housing 21, and a plurality of heat dissipation fins 26 are arranged at intervals along the axial direction of the housing 21 to form a heat dissipation groove.

A cooling fan 16 is also provided on the inner side wall of the installation chamber 14 of the barrel body 10. The cooling fan 16 generates a cooling airflow perpendicular to the internal channel of the barrel body 10. The airflow flows through the cooling slots on the light collecting lens group 20 and takes the heat on the cooling slots out from the air outlet on the barrel body 10. The cooling slots formed by the plurality of cooling fins 26 increase the cooling area, reduce the temperature of the light collecting lens group 20, and increase the service life of the light collecting lens group 20.

The light collecting lens group 20 in this embodiment is disposed at the front end of the first housing 111, which is close to the light source of the photographic lamp and receives the most light and heat. After long-term use, the light collecting lens group 20 may be cracked and damaged. In order to reduce the steps of disassembling and assembling the light collecting lens group 20, To improve the replacement efficiency, an opening 101 is formed at the front end of the tube body 10, and the opening 101 is connected to the internal space of the tube body 10 to form an installation chamber 14. The light collecting lens group 20 can enter and be accommodated in the installation chamber 14 along the opening 101 on the front end surface of the tube body 10. When the light collecting lens group 20 needs to be replaced, it is only necessary to move the light collecting lens group 20 out of the installation chamber 14 by using a card, and it is no longer necessary to disassemble the shell 11 of the projection tube 100. The operation process does not involve other components, and the operation is very simple, which greatly improves the work efficiency of replacing the light collecting lens group 20.

Embodiment 2

7 to 9, this embodiment provides another method for fixing the light receiving lens assembly 20 in the installation chamber 14. By configuring the light receiving lens assembly 20 and the bayonet member 30 as an integral structure, when the bayonet member 30 is connected and fixed to the front end surface of the tube body 10, the light receiving lens assembly 20 can be correspondingly accommodated and fixed in the installation chamber 14 of the tube body 10.

Specifically, in this embodiment, the outer shell 21 of the light receiving lens 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 lens group 20 is correspondingly accommodated and fixed in the installation chamber 14 of the tube body 10.

Compared with the first embodiment, the bayonet member 30 and the barrel body 10 are used to abut and position the light receiving mirror group 20, the second embodiment adopts the method of integrally forming the bayonet member 30 and the light receiving mirror group 20, which no longer needs to be provided with the front positioning rib 231 on the housing 21 of the light receiving mirror group 20, and no longer needs to be provided with the second limiting portion 33 on the bayonet member 30, and also reduces the use of the fixing ring 50 and the gasket 25 on the front positioning rib 231. The housing 21 of the light receiving mirror group 20 has a simpler structure.

When it is necessary to replace the light collecting lens group 20, it is only necessary to separate the bayonet member 30 from the barrel body 10, and then replace the light collecting lens group 20 and the bayonet member 30 together. The light collecting lens group 20 and the bayonet member 30 are set as an integrated structure, and the replacement operation of the light collecting lens group 20 is simpler, which can further speed up the replacement speed of the light collecting lens group 20 and improve the user experience.

Embodiment 3

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 also necessary to fine-tune the position of the light-collecting lens group 20 so that the light-collecting lens group 20 is fixed on the axis of the projection tube 100. This operation is inconvenient, which affects the assembly efficiency.

The present embodiment provides a projection tube 100, as shown in Figures 10 to 26, which includes a tube body 10 and a light collecting lens group 20. By providing a first guide portion 17 in the tube body 10 and providing a second guide portion 27 on the light collecting lens group 20 that matches the first guide portion 17, the light collecting lens group 20 can be installed in the tube body 10 at a set path and a fixed angle.

When the light collecting mirror group 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 collecting mirror group 20 and the first guide portion 17 of the installation chamber 14 are connected to each other, so that the light collecting mirror group 20 is installed in the installation chamber 14 at a set angle, and the light collecting mirror group 20 is restricted from rotating in the installation chamber 14. The cooperation of the first guide portion 17 and the second guide portion 27 can accurately position the light collecting mirror group 20, and the position of the light collecting mirror group 20 does not need to be adjusted during the replacement process. The operation is very simple, which greatly improves the installation efficiency of the light collecting mirror group 20 and facilitates the maintenance and replacement of the light collecting mirror group 20 by the staff.

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.

10 to 13 , the front end opening 101 of the tube body 10 is connected to the inner space thereof, so as to form 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 provided in the inner space between the light outlet 102 and the opening 101.

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.

Please refer to Figures 11 and 13. The light collecting mirror assembly 20 can enter the installation chamber 14 of the tube body 10 along the opening 101 on the front end surface of the tube body 10. A first guide portion 17 is provided on the inner side wall of the tube body 10 corresponding to the installation chamber 14, and a second guide portion 27 adapted to the first guide portion 17 is provided on the outer side surface of the housing 21. When the first guide portion 17 and the second guide portion 27 are in contact and slide with each other, the light collecting mirror assembly 20 is installed in the installation chamber 14 at a set angle.

It should be understood that the shapes of the first guide portion 17 and the second guide portion 27 can be various, such as a slider and a slide rail, a boss and a slide groove, etc. As long as the relative docking positioning of the first guide portion 17 and the second guide portion 27 can be satisfied, the light collecting mirror assembly 20 can be installed in the installation chamber 14 along a set path.

In this embodiment, referring to FIG. 11 , FIG. 14 and FIG. 15 , the first guide portion 17 is a groove structure provided on the barrel body 10, and the groove structure extends along the axis direction of the barrel body 10. The second guide portion 27 is a boss structure convexly provided on the outer wall of the housing 21, and the boss structure extends along the axis direction of the housing 21, and the boss structure is adapted to 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 set path and is installed in the installation chamber 14.

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.

Referring to Figures 11 and 15, in this embodiment, the barrel body 10 further includes a connecting plate 171 and a support 172, the connecting plate 171 is connected to the inner side wall of the installation chamber 14, the support 172 is arranged on the connecting plate 171, and the first guide portion 17 is arranged on the top surface of the support 172 away from the connecting plate 171. In this embodiment, the first guide portion 17 is a groove structure.

Among them, the connecting plate 171 is provided with four connecting holes for fixing with the inner side wall of the barrel body 10 so that it can be fixed in the installation chamber 14. The support platform 172 is arranged on the connecting plate 171 and protrudes upward. As shown in FIG12 , the bottom surface of the groove structure on the upper surface of the support platform 172 is slightly higher than the side wall of the opening 101 on the front end surface of the barrel body 10, and the boss structure on the housing 21 can slide with the groove structure in the barrel body 10, so that the light collecting lens group 20 can enter the installation chamber 14 along a fixed path.

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 formed on the inner side of the shell 11, and the groove structure cooperates with the protrusion on the light collecting lens group 20 to achieve the docking of the light collecting lens group 20.

In some other embodiments, please refer 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 collecting mirror group 20, and the boss structure is set on the inner wall of the installation chamber 14 of the tube body 10.

For example, in Figures 24 to 26, the first guide portion 17 is a boss structure provided on the inner side wall of the barrel body 10 and extends along the axial direction of the barrel body 10. The second guide portion 27 is a groove structure recessed on the housing 21 and extends along the axial direction of the housing 21. The groove structure on the housing 21 is adapted to the boss structure on the barrel body 10 and slides relatively, so that the light collecting lens group 20 can enter the installation chamber 14 of the barrel body 10 in a set path.

At this time, the first guide portion 17 can still be arranged on the top surface 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 arranged on the inner side wall of the barrel body 10, and extend out of the side wall of the opening 101 of the front end surface of the barrel body 10.

In some other embodiments, the first guide portion 17 and the second guide portion 27 may be correspondingly set to multiple, 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.

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 wall of the tube body 10, so that the boss structure and the groove structure on the light collecting mirror group 20 can slide along the groove structure and the boss structure in the tube body 10 to enter the installation chamber 14.

Of course, as shown in FIG. 21 to FIG. 26 , the plurality of second guide portions 27 may all be configured as boss structures or groove structures, and correspondingly, the plurality of first guide portions 17 may all be configured as groove structures or boss structures, so that the light collecting lens assembly 20 enters the installation chamber 14 of the barrel body 10 along a set path.

11 and 16 , the projection tube 100 of this embodiment further includes a bayonet 30, which is detachably connected to the front end surface of the tube body 10 and abuts against the light collecting lens group 20 to fix the light collecting lens group 20 to the installation chamber 14. The bayonet 30 is provided with a light-transmitting hole 311, and when the bayonet 30 is connected to the tube body 10, the light-transmitting hole 311 is arranged opposite to the light collecting lens 22, so that light can smoothly pass through the projection tube 100.

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 arranged at one end of the bayonet body 31, and extends in the radial direction of the bayonet body 31. The bayonet outer edge 32 is provided with a plurality of through holes 321, and the screws 40 pass through the through holes 321 on the bayonet outer edge 32 and are connected with the threaded holes on the barrel body 10, so as to fix the bayonet member 30 on the front end surface of the barrel body 10.

As shown in FIG. 11 , a plurality of evenly distributed locking blocks 312 are convexly disposed 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 .

In some other embodiments, please refer to 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 setting 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.

Please refer to Figures 11, 14 and 19. In this embodiment, positioning ribs 23 are convexly provided on the outer side walls at both ends of the housing 21. Positioning ribs 151 cooperating with the positioning ribs 23 are convexly provided on the bayonet member 30 and the barrel body 10. The position limiting ribs 151 abut against the positioning ribs 23 to fix the light collecting lens group 20 in the installation chamber 14 and limit the axial movement of the light collecting lens group 20 along the barrel body 10.

Specifically, as shown in FIG14 , two light collecting lenses 22 with different radii are arranged in the inner space 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 arranged at one end close to the bayonet 30, and the rear positioning rib 232 is arranged at one end away from the bayonet 30.

As shown in Fig. 16 and Fig. 19, a receiving groove is provided on the side of the bayonet body 31 of the bayonet member 30 facing the barrel body 10, and a second limiting portion 33 is provided in the receiving groove, which is protruded along the extending direction of the axis of the bayonet member 30. When the bayonet member 30 is connected to the front end surface of the barrel body 10, the second limiting portion 33 abuts against the front positioning rib 231 of the light receiving lens group 20 to limit the light receiving lens group 20 from moving forward along the axis of the barrel body 10.

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 material 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.

Please refer to Figures 11 and 19, a first limiting portion 15 protruding toward the axis is provided on the inner side wall of the barrel body 10. A convex ring 152 is provided on the first limiting portion 15 to form a positioning cavity for accommodating the rear positioning rib 232 on the housing 21, and the end surface of the rear positioning rib 232 abuts against the end surface of the convex ring 152 to limit the light collecting lens group 20 from moving backward along the axis of the barrel body 10.

As shown in FIG19 , a sealing groove is provided on the outer side surface of the front positioning rib 231 and the rear positioning mirror, and a silicone gasket is provided in the sealing groove to radially fix the light collecting mirror group 20 in the installation chamber 14 of the tube body 10, so that the installation of the light collecting mirror group 20 is more stable.

Please refer to FIGS. 17 to 20 . In some other embodiments, a positioning structure is further provided on the projection tube 100 to further position the light collecting lens assembly 20 and prevent the light collecting lens assembly 20 from rotating in the tube body 10 .

As shown in Fig. 17, Fig. 18, Fig. 21 and Fig. 24, a positioning plane 28 is provided on one end of the housing 21 of the light collecting mirror assembly 20 facing the barrel body 10, and a positioning block 18 matched with the positioning plane 28 is provided in the barrel body 10. When the light collecting mirror assembly 20 is accommodated in the installation chamber 14, the positioning block 18 abuts against the positioning plane 28, so that the light collecting mirror assembly 20 is positioned and matched with the installation chamber 14, and the rotation of the light collecting mirror assembly 20 in the barrel body 10 is prevented.

As shown in FIG17 , the positioning plane 28 is arranged on the rear positioning rib 232 of the housing 21. Correspondingly, as shown in FIG18 and FIG20 , the positioning block 18 in the barrel body 10 is arranged on the inner side wall of the positioning cavity of the first limiting portion 15 and protrudes toward the axis direction of the barrel body 10, so that the rear positioning rib 232 on the light collecting lens group 20 can only dock with the positioning cavity on the first limiting portion 15 on the barrel body 10 at an angle. And the rear positioning rib 232 cannot rotate in the positioning cavity of the first limiting portion 15, so as to further realize the positioning of the light collecting lens group 20.

In this embodiment, a first guide portion 17 for guiding is provided on the inner side wall of the installation chamber 14 of the barrel body 10, and a second guide portion 27 adapted to the first guide portion 17 is provided on the outer shell 21 of the light collecting mirror group 20. The second guide portion 27 slides along the first guide portion 17, so that the light collecting mirror group 20 can slide into the installation chamber 14 at a set path and a fixed angle. During this process, the light collecting mirror group 20 will not be offset. After the light collecting mirror group 20 is assembled, it is no longer necessary to fine-tune the light collecting mirror group 20. The operation is very simple, which greatly improves the work efficiency of replacing the light collecting mirror group 20 and is also convenient for the staff to carry out maintenance work.

Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims (17)

A projection tube, characterized by comprising: 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. The projection tube according to claim 1 is characterized in that a rear positioning rib is protruding on the outer wall of the outer shell, and the rear positioning rib is arranged at one end of the outer shell close to the tube body, and 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. The projection tube according to claim 2 is 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 installation chamber of the tube 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 tube 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. The projection tube according to claim 1 is characterized in that the projection tube also includes a bayonet, the bayonet 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. The projection tube according to claim 1 is characterized in that the projection tube also includes a bayonet piece, and the bayonet piece and the light collecting lens group are separately arranged; the bayonet piece is detachably connected to the front end face opening of the tube body, and the bayonet piece abuts against the light collecting lens group to fix the light collecting lens group in the installation chamber; a light transmission hole is provided on the bayonet piece, and the light transmission hole is arranged opposite to the light collecting lens. The projection tube according to claim 5 is characterized in that a front positioning rib is protruding on the outer side 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 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. The projection tube according to claim 6 is 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. The projection tube according to claim 4 or 5 is 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 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 screws can pass through the through holes and then 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. The projection tube according to claim 4 or 5 is characterized in that a fixing groove is provided on the end surface of the bayonet piece facing the tube body, and a fixing block is provided on the front end surface of the tube body facing the bayonet, and the fixing block is accommodated in the fixing groove so that the bayonet piece is docked on the tube body at a set angle. The projection tube according to claim 1 is 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 outer 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. The projection tube according to claim 1 is characterized in that the outer shell is further provided with heat dissipation fins, the heat dissipation fins are arranged around the circumference of the outer surface of the outer shell, and a plurality of the heat dissipation fins are arranged at intervals along the axial direction of the outer shell. The projection tube according to claim 1 is 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 collecting mirror group; the light collecting mirror group is installed from the opening of the tube body to the installation chamber, and the second guide portion is matched with the first guide portion, so that the light collecting mirror group is installed in the installation chamber at a fixed angle. The projection tube according to claim 12 is characterized in that the first guide portion is a groove structure arranged on the inner side wall of the tube body, and the groove structure extends along the axial direction of the tube body; the second guide portion is a boss structure convexly provided 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. The projection tube according to claim 12 is characterized in that the first guide portion is a boss structure arranged on the inner side wall of the tube body and extends along the axial direction of the tube 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. The projection tube according to claim 12, characterized in that at least two second guide parts are provided on the outer shell of the light collecting lens group; some of the second guide parts are boss structures, and the other 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 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. The projection tube according to any one of claims 13 to 15 is characterized in that the tube body also includes a connecting plate and a support platform, the connecting plate is connected to the inner wall of the installation chamber, the support platform is arranged on the connecting plate and protrudes in the axial direction of the tube body, and the first guide portion is arranged on the side of the support platform away from the connecting plate. The projection tube according to claim 12 is 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.