CN209117944U - Optical tunnel, optical module and projection arrangement - Google Patents

Abstract

The utility model provides a uniform light rod, an optical component and a projection device. The homogenizing rod includes a rod body, a first end and a second end, the first end is located at one end of the rod body, and the size of the cross-section of the first end is different from the size of the cross-section of the rod body; the second end is located at the rod body. At the other end of the body, the size of the cross-section of the second end is different from the size of the cross-section of the rod body. The optical assembly includes a homogenizing rod and a holder. The holder includes a first support plate and a second support plate. The first support plate is provided with a first installation hole, and the first support plate is matched with the first end through the first installation hole. The second support plate is provided with a second installation hole, and the second support plate is matched with the second end through the second installation hole to hold the uniform light rod. In the present invention, the cross-sectional dimensions of the first end and the second end of the homogenizing rod are designed to be different from the cross-sectional size of the rod body, so that the uniform light can be improved without destroying the total reflection effect of the homogenizing rod. Stability of rod fixation.

Description

Homogenizing rod, optical component and projection device

technical field

The utility model relates to the technical field of optics, in particular to a light homogenizing rod, an optical component and a projection device.

Background technique

The homogenizing rod plays the role of homogenizing light in the projection lighting system, especially in laser projection products, after the laser has been reflected multiple times in and out of the reflecting surface of the homogenizing rod, it can break the strong coherence of the original laser light source. The outgoing end obtains outgoing light with uniform intensity. In high-energy laser projection, a solid dodging rod is usually used as a laser dodging device, which is usually fixed by metal dome or structural parts. Since the contact point between the fixed structure of the homogenizing rod and the homogenizing rod will destroy the total reflection effect of the homogenizing rod, resulting in partial light leakage, the temperature of the fixed structure will rise when the light energy is large, and in the case of thermal expansion and cold contraction , there will be a lot of stress between the fixing device and the homogenizing rod, which is easy to cause damage to the homogenizing rod, thereby affecting the fixing effect of the homogenizing rod.

Utility model content

In view of the above problems, the present application provides a homogenizing rod, an optical assembly and a projection device to increase the stability of fixing the homogenizing rod. The present invention achieves the above purpose through the following technical solutions.

In the first aspect, the present invention provides a light homogenizing rod. The light homogenizing rod includes a rod body, a first end and a second end. The first end is located at one end of the rod body, and the dimensions of the cross-section of the first end are different. The size of the section of the rod body; the second end is located at the other end of the rod body, and the size of the section of the second end is different from the size of the section of the rod body.

In a second aspect, the present invention provides an optical assembly, the optical assembly includes a light homogenizing rod and a holder, the holder includes a first support plate and a second support plate, the first support plate is provided with a first installation hole, the first The support plate is matched with the first end through the first installation hole, the second support plate is provided with a second installation hole, and the second support plate is matched with the second end through the second installation hole to hold the homogenizing rod.

In a third aspect, the present invention provides a projection device, which includes the above-mentioned optical components, and the optical components are arranged in the projection device.

Compared with the prior art, the homogenizing rod, the optical assembly and the projection device provided by the present invention are designed by designing the cross-sectional dimensions of the first end and the second end of the homogenizing rod to be different from the cross-sectional size of the rod body, so that the Under the condition of not destroying the total reflection effect of the uniform light rod, the fixed stability of the uniform light rod can be improved.

These and other aspects of the present invention will be more clearly understood in the description of the following embodiments.

Description of drawings

FIG. 1 is a schematic three-dimensional structure diagram of a uniform light rod provided by the first embodiment of the present invention.

FIG. 2 is a front view of FIG. 1 .

FIG. 3 is a left side view of FIG. 1 .

FIG. 4 is a schematic three-dimensional structure diagram of a uniform light rod provided by the second embodiment of the present invention.

FIG. 5 is a schematic three-dimensional structure diagram of the uniform light rod provided by the third embodiment of the present invention.

FIG. 6 is another three-dimensional schematic diagram of the uniform light rod provided by the third embodiment of the present invention.

FIG. 7 is a schematic three-dimensional structural diagram of an optical assembly provided by a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view taken in the direction A-A of FIG. 7 .

9 is a schematic three-dimensional structural diagram of a first support plate of an optical assembly provided by a fourth embodiment of the present invention.

FIG. 10 is a schematic three-dimensional structural diagram of the second support plate of the optical assembly provided by the fourth embodiment of the present invention.

11 is a schematic three-dimensional structural diagram of a housing of an optical component provided by a fifth embodiment of the present invention.

FIG. 12 is a schematic three-dimensional structural diagram of an optical assembly provided by a fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view taken in the direction B-B of FIG. 7 .

FIG. 14 is a schematic structural diagram of a projection device provided by a sixth embodiment of the present invention.

Detailed ways

In order to facilitate the understanding of the embodiments of the present invention, a more comprehensive description of the embodiments of the present invention will be given below with reference to the related drawings. The preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which the present invention belongs. The terms used in the embodiments of the present invention herein are only for the purpose of describing specific implementations, and are not intended to limit the present invention.

first embodiment

Please refer to FIG. 1 to FIG. 3 together. The homogenizing rod 11 provided in this embodiment includes a rod body 111 , a first end 113 and a second end 115 . The first end 113 is located at one end of the rod body 111 . The size of the cross-section of the end portion 113 is different from that of the rod body 111 ;

Specifically, the homogenizing rod 11 includes a rod body 111 , which is the main part of the homogenizing rod 11 . In this example, the rod body 111 is a square cylinder structure. It can be understood that in other embodiments, the shape of the rod body 111 can be set to a structure such as a square rod, a cylinder, a truncated cone or a cone according to actual needs. The rod body 111 includes a closed first edge 1111 and a second edge 1113 . The first edge 1111 and the second edge 1113 are located at two ends of the rod body 111 respectively, that is, the first edge 1111 and the second edge 1113 are the two ends of the rod body 111 . The edge of the rod body 111 also includes an outer peripheral surface 1115 .

The homogenizing rod 11 further includes a first end portion 113 and a second end portion 115 .

The first end portion 113 is located at one end of the rod body 111 , the size of the cross-section of the first end portion 113 is smaller than the size of the cross-section of the rod body 111 , and the first end portion 113 includes a first light-passing surface 1132 and surrounds the first light-passing surface 1132 1136 of the first holding surface. The edge of the first light-transmitting surface 1132 is located within the first edge 1111 . In this embodiment, the shape of the rod body 111 is set to be a square bar, and the first light-transmitting surface 1132 may be a square. Of course, the first light-transmitting surface 1132 also It can be other shapes such as circle, triangle, trapezoid or other polygons, and the first light-transmitting surface 1132 can be a light-incident surface, that is, the end face of the light entering the homogenizing rod 11. It should be noted that the first light-transmitting surface 1132 also It can be the light-emitting surface, that is, the end surface where the light exits from the uniform light rod 11 . In this embodiment, the first light-transmitting surface 1132 may be located at the center of one end of the rod body 111 .

The first holding surface 1136 extends from the first light-transmitting surface 1132 to the rod body 111. In this embodiment, the first holding surface 1136 includes four planes that are vertically connected in sequence. It can be understood that the shape of the first holding surface 1136 It can be determined by the shape of the first light-passing surface 1132. For example, when the first light-passing surface 1132 is a triangle, the first holding surface 1136 is composed of three planes connected end to end. When the first light-passing surface 1132 is a trapezoid, the A holding surface 1136 is composed of four planes connected end to end.

The first holding surface 1136 can be connected to the fixing structure of the homogenizing rod 11 (eg, by means of bonding), so that the homogenizing rod 11 can be fixed at the end.

In this embodiment, the first end portion 113 further includes a first connecting surface 1134 , the first connecting surface 1134 is annular, the outer edge of the first connecting surface 1134 is connected to the first edge 1111 , and the inner edge of the first connecting surface 1134 Connected to the first holding surface 1136, the first connecting surface 1134 can be set to an appropriate size according to actual needs.

In other embodiments, the first end portion 113 may not include the first connecting surface 1134, and the first holding surface 1136 directly connects the edge of the first light-passing surface 1132 and the first edge 1111, that is, the first holding surface 1136 is inclined It is arranged and extends from the first light-transmitting surface 1132 to the rod body 111 , and the first end is in the shape of a truncated cone or a truncated cone.

The first light-transmitting surface 1132 , the first connecting surface 1134 and the first holding surface 1136 together form a stepped structure.

The second end portion 115 is located at the other end of the rod body 111 , the size of the cross-section of the second end portion 115 is smaller than the size of the cross-section of the rod body 111 , and the second end portion 115 includes a second light-passing surface 1152 and surrounds the second light-passing surface In the second holding surface 1156 of the 1152, the edge of the second light-transmitting surface 1152 is located in the second edge 1113. In this embodiment, the shape of the rod body 111 is set to a square rod shape, and the second light-transmitting surface 1152 is located in the rod body 111. At the center of the other end, the second light-passing surface 1152 can be square, the second light-passing surface 1152 can also be other shapes such as circle, triangle, trapezoid or other polygons, and the shape of the second light-passing surface 1152 The first light passing surfaces 1132 are the same. In this embodiment, the first light-transmitting surface 1132 is a light-incident surface, and the second light-transmitting surface 1152 is a light-emitting surface.

The second holding surface 1156 extends from the second light-transmitting surface 1152 to the rod body 111. In this embodiment, the second holding surface 1156 includes four planes that are vertically connected in sequence. It can be understood that the shape of the second holding surface 1156 can be The shape of the second light passing surface 1152 is determined. For example, when the second light passing surface 1152 is circular, the second connecting surface 1154 is composed of a circular arc surface.

The second holding surface 1156 is used to connect with the fixed structure of the leveling rod 11 (eg, by bonding), and the leveling rod 11 is fixed at the end through the cooperation between the second holding surface 1156 and the first holding surface 1136 .

In this embodiment, the second end portion 115 further includes a second connection surface 1154 , the second connection surface 1154 is annular, the outer edge of the second connection surface 1154 is connected to the second edge 1113 , and the inner edge of the second connection surface 1154 Connected with the second holding surface 1156, the second connecting surface 1154 can be set to an appropriate size according to actual needs.

In other embodiments, the second end portion 115 may not include the second connecting surface 1154, and the second holding surface 1156 directly connects the edge of the second light-passing surface 1152 and the second edge 1113, that is, the second holding surface 1156 is inclined It is arranged and extends from the second light passing surface 1152 to the rod body 111 , and the second end is in the shape of a truncated cone or a truncated cone.

The second light-transmitting surface 1152 , the second connecting surface 1154 and the second holding surface 1156 together form a stepped structure.

To sum up, in the homogenizing rod 11 provided in this embodiment, the cross-sectional dimensions of the first end 113 and the second end 115 of the homogenizing rod 11 are designed to be different from the cross-sectional size of the rod body 111, so that the uniformity is not damaged. Under the condition of the total reflection of the light rod 11 , the fixing stability of the uniform light rod 11 can be improved.

Second Embodiment

Referring to FIG. 4 , the difference from the first embodiment is that the size of the cross-section of the second end 215 of the homogenizing rod 21 provided in this embodiment is larger than the size of the cross-section of the rod body 211 , and the edge of the second light-transmitting surface 2152 Located outside the second edge 2113 ; the outer edge of the second connecting surface 2154 is connected to the second holding surface 2156 , and the inner edge of the second connecting surface 2154 is connected to the second edge 2113 .

In this embodiment, the area of the second light-transmitting surface 2152 is larger than that of the first light-transmitting surface 2132 , that is, the area of the light exit surface is larger than the area of the light incident surface. It can be understood that, in other embodiments, the second light passing surface 2152 may be a light incident surface, and correspondingly, the first light passing surface 2132 may be a light exit surface, that is, the area of the light entrance surface may be larger than that of the light exit surface.

The area of the second holding surface 2156 can be appropriately larger, because a small area of the second holding surface 2156 will affect the installation stability of the uniform light rod 21, while a large area of the second holding surface 2156 will not affect the total reflection of light . Considering the production cost, the area of the second holding surface 2156 should not be too large.

To sum up, in the homogenizing rod 21 provided in this embodiment, the size of the cross-section of the second end 215 is designed to be larger than the size of the cross-section of the rod body 211 , and the edge of the second light-transmitting surface 2152 is arranged between the second edge 2113 In addition, the first holding surface 2136 and the second holding surface 2156 are fixed, so that the stability of the fixation of the leveling rod 21 can be improved without destroying the total reflection effect of the leveling rod 21 .

Third Embodiment

Please refer to FIG. 5 and FIG. 6 together. The difference from the first embodiment is that the size of the cross-section of the first end 313 of the homogenizing rod 31 provided in this embodiment is larger than the size of the cross-section of the rod body 311 . The edge of the smooth surface 3132 is located outside the first edge 3111 ; the outer edge of the first connecting surface 3134 is connected to the first holding surface 3136 , and the inner edge of the first connecting surface 3134 is connected to the first edge 3111 . The size of the cross-section of the second end portion 315 is larger than that of the rod body 311, the edge of the second light-transmitting surface 3152 is located outside the second edge 3113; the outer edge of the second connecting surface 3154 is connected to the second holding surface 3156, the first The inner edges of the two connecting surfaces 3154 are connected to the second edge 3113 .

In the homogenizing rod 31 provided in this embodiment, the size of the cross-section of the first end 313 is designed to be larger than the size of the cross-section of the rod body 311, and the edge of the first light-transmitting surface 3132 is set outside the first edge 3111. The size of the cross-section of the second end portion 315 is designed to be larger than the size of the cross-section of the rod body 311 , the edge of the second light-transmitting surface 3152 is set outside the second edge 3113 , and the first holding surface 3136 and the second holding surface 3156 The fixing is carried out, so that the stability of the fixing of the homogenizing rod 31 can be improved under the condition of not destroying the total reflection effect of the homogenizing rod 31 .

Fourth Embodiment

Please refer to FIG. 7 to FIG. 10 together. The optical assembly 40 provided in this embodiment includes any of the homogenizing rods in the above embodiments, such as the homogenizing rod 21 , and the optical assembly 40 further includes a holder 42 , and the holder 42 is used to The light bar 21 is fixed. The holder 42 includes a first support plate 421 and a second support plate 423. The first support plate 421 is provided with a first mounting hole 4215, and the first support plate 421 passes through the first mounting hole 4215 and the first end. 213, the second support plate 423 is provided with a second installation hole 4235, and the second support plate 423 cooperates with the second end portion 215 through the second installation hole 4235 to hold the homogenizing rod 21, that is, the first support plate 421 and the second end 215. The second support plate 423 can be changed with the change of the first end portion 213 and the second end portion 215 , as long as the homogenizing rod 21 can be fixed.

Specifically, the holder 42 includes a first support plate 421 and a second support plate 423. The materials of the first support plate 421 and the second support plate 423 can be metal or plastic, but need to be able to support the uniform light rod 21, Please refer to FIG. 9 alone. In this embodiment, the first supporting plate 421 is a square plate. In other embodiments, the first supporting plate 421 may also be a circular plate, a triangular plate, or a trapezoidal plate. The first supporting plate 421 It includes a first surface 4211 and a second surface 4213 opposite to the first surface 4211. The first surface 4211 can be parallel to the second surface 4213. The first support plate 421 also includes a hole wall 4217 and a first side wall 4219. The support plate 421 also defines a first mounting hole 4215 .

In this embodiment, the first surface 4211 is away from the second end 215 relative to the second surface 4213 , and the first surface 4211 may be flush with the first light-transmitting surface 2132 . In other embodiments, the first surface 4211 may also be protruded or recessed from the first light-transmitting surface 2132 .

The second surface 4213 is in contact with the first connecting surface 2134, so that the uniform light rod 21 is fixed at the end.

The first mounting hole 4215 penetrates through the first surface 4211 and the second surface 4213. The shape and size of the first mounting hole 4215 and the first light-transmitting surface 2132 are the same. Therefore, the first mounting hole 4215 can also be a square hole or a triangular hole. Or a trapezoidal hole, the hole wall 4217 encloses the first mounting hole 4215, and the hole wall 4217 and each plane of the first holding surface 2136 can abut, so that the homogenizing rod 21 is fixed at the end.

The first side wall 4219 is the outer side surface of the first support plate 421 , and the first side wall 4219 is connected between the first surface 4211 and the second surface 4213 .

Please refer to FIG. 10 alone. In this embodiment, the second supporting plate 423 can also be a circular plate, a triangular plate or a trapezoidal plate. The second supporting plate 423 includes a third surface 4231 and a surface opposite to the third surface 4231. The fourth surface 4233, the third surface 4231 can be parallel to the fourth surface 4233, the second support plate 423 includes a first stepped surface 4232, a second stepped surface 4234, a third stepped surface 4236 and a second sidewall 4237, the second support plate 423 The plate 423 also defines a second mounting hole 4235, and the second mounting hole 4235 may be a stepped hole.

The third surface 4231 is close to the first end 213 relative to the second light passing surface 2152 , and the fourth surface 4233 protrudes from the second light passing surface 2152 .

The second mounting hole 4235 passes through the third surface 4231 and the fourth surface 4233. The shape of the second mounting hole 4235 is related to the configuration of the second holding surface 2156. The second mounting hole 4235 is a square hole, and when the second holding surface 2156 is composed of three planes connected end to end, the second mounting hole 4235 is a triangular hole, and the second mounting hole 4235 can also have other shapes.

The first stepped surface 4232, the second stepped surface 4234 and the third stepped surface 4236 enclose a second mounting hole 4235, wherein the second stepped surface 4234 is parallel to the fourth surface 4233 and is vertically connected to the first stepped surface 4232 and the first stepped surface 4232. The step surface 4232, the first step surface 4232 is vertically connected to the third surface 4231, the third step surface 4236 is vertically connected to the fourth surface 4233, and the area enclosed by the third step surface 4236 is smaller than that enclosed by the first step surface 4232. combined area.

The first stepped surface 4232 and the second holding surface 2156 can be in contact, so that the homogenizing rod 21 is fixed at the end, and the second stepped surface 4234 is in contact with the second light-transmitting surface 2152, so that the homogenizing rod 21 can be obtained at the end. fixed.

It should be noted that when the first holding surface 2136 and the second holding surface 2156 are fixed (for example, they are fixedly bonded to the first support plate 421 and the second support plate 423 respectively by adhesive), the first connection surface 2134 Whether or not the second connecting surface 2154 is fixed does not affect the fixing of the dodging rod 21 .

The second side wall 4237 is the outer side surface of the second support plate 423 , and the second side wall 4237 is connected between the third surface 4231 and the fourth surface 4233 .

The holder 42 also includes a fixing bracket. The material of the fixing bracket 425 can be metal. The fixing bracket 425 includes a bracket body 4251, a first link 4253 and a second link 4255. The first link 4253 and the second link 4255 are both It can be connected with the bracket body 4251 by welding, bonding, or a quick release structure. The first link 4253 can be connected with the first side wall 4219 of the first support plate 421 by welding, and the second link 4255 can be connected with the second side wall 4237 of the second support plate 423 by welding. Other connection methods such as integral molding or casting process. It can be understood that the first connecting rod 4253 can also be connected to the first surface 4211 or the second surface 4213, or another hole is opened on the first supporting plate 421, and the first connecting rod 4253 is penetrated through the first supporting plate 421 and The first support plate 421 is fixed on the fixing bracket 425, and the second connecting rod 4255 can be connected in the same way.

It is understood that the features of the above-described embodiments can be combined with each other to form new embodiments.

To sum up, in the optical assembly 40 provided in this embodiment, through the cooperation between the first support plate 421 and the first end portion 213 and the cooperation between the second support plate 423 and the second end portion 215 , the uniform light rod 21 is not damaged. Under the condition of total reflection, the fixation stability of the homogenizing rod 21 can be improved. The connection between the fixing bracket 425 and the first support plate 421 and the second support plate 423 provides a simple structure for stably fixing the homogenizing rod 21 .

Fifth Embodiment

Please refer to FIG. 11 to FIG. 13 together. The difference from the fourth embodiment is that the holder 52 in the optical assembly 50 provided in this embodiment does not include the fixing bracket 425 , and the holder 52 includes a housing 525 . The material of the casing 525 can be the same as that of the first supporting plate 521 and the second supporting plate 523 , and the casing 525 can be a square casing with a square cross-section, or a cylindrical casing with other shapes such as a circular cross-section.

The casing 525 may be integrally formed with the first support plate 521 and the second support plate 523. As shown in FIG. 11, the casing 525 includes two independent casing units in the length direction, such as the first casing unit 5251 and the second casing unit 525. The second casing unit 5253, wherein the first casing unit 5251 and the first support plate 521 are integrally formed, and the second casing unit 5253 and the second supporting plate 523 are integrally formed, that is, the holder 52 is divided into two parts in the length direction Independent holding unit, the first housing unit 5251 and the second housing unit 5253 can be matched by means of clipping, welding, bonding, etc., so that the housing and the first supporting plate 521 and the second supporting plate 523 can be combined together. To form a whole, the shell 525 can also include two independent shell units in the width or height direction, while the first support plate 521 and the second support plate 523 respectively include two independent support units, that is, the holding The member 52 is divided into two independent holding units in the width or height direction, and the two holding units can also be matched by means such as clamping, welding, and bonding.

The casing 525 includes a side wall 5255 , two ends of the side wall 5255 are respectively connected to the first support plate 521 and the second support plate 523 , and the homogenizing rod 21 is accommodated in the casing 525 . It can be understood that the homogenizing rod 21 can be any one of the foregoing embodiments, and correspondingly, the first support plate 521 and the second support plate 523 can be changed with the change of the first end portion 213 and the second end portion 215 , as long as the uniform light rod 21 can be fixed.

There is an air gap between the side wall 5255 and the homogenizing rod 21 , that is, an air gap exists between the outer peripheral surface 2115 of the homogenizing rod 21 and the side wall 5255 .

In conclusion, in the optical assembly 50 provided in this embodiment, the cooperation between the first support plate 521 and the first end portion 213 and the cooperation between the second support plate 523 and the second end portion 215 increase the stability of the fixation of the homogenizing rod 21 . The first support plate 521 and the second support plate 523 are respectively connected to the two ends of the side wall 5255 of the housing 525, and the light homogenizing rod 21 is accommodated in the housing 525, so that the light homogenizing rod 21 achieves the sealing effect, The influence of dust on the side surface of the even light rod 21 is reduced; there is an air gap between the side wall 5255 and the even light rod 21 , which will not affect the total reflection of the even light rod 21 .

Sixth Embodiment

Referring to FIG. 14 , this embodiment provides a projection device 600 including an optical assembly 50. It can be understood that in other embodiments, the projection device 600 may include any of the optical assemblies in the above-mentioned embodiments. The optical assembly 50 is provided in the projection device 600 . The projection device 600 further includes at least a light source system 60, an optical machine 70, a lens 80, a projection screen 90, etc., wherein the structure and connection relationship of the light source system 60, the optical machine 70, the lens 80, and the projection screen 90 and other components can refer to existing technology, which will not be repeated here.

The projection device 600 provided in this embodiment includes an optical assembly 50, and the optical assembly 50 includes a homogenizing rod 21. By designing the two ends of the homogenizing rod 21 into a step-like fixed structure, the entire surface of the homogenizing rod 21 is not damaged. Under the condition of reflection, the fixed stability of the uniform light rod 21 can be improved, thereby improving the working efficiency of the projection device.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the present invention. It should be pointed out that for those of ordinary skill in the art, some modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (10)

1. a uniform light rod, is characterized in that, comprises: rod body; a first end part, located at one end of the rod body, the size of the cross section of the first end part is different from the size of the cross section of the rod body; The second end portion is located at the other end of the rod body, and the size of the cross section of the second end portion is different from the size of the cross section of the rod body. 2. The homogenizing rod of claim 1, wherein the first end portion comprises a first light-passing surface and a first holding surface surrounding the first light-passing surface, the first holding surface Extending from the first light-passing surface to the rod body; the second end portion includes a second light-passing surface and a second holding surface surrounding the second light-passing surface, the second holding surface extending from the The second pass light extends toward the rod body. 3. The homogenizing rod according to claim 2, wherein the rod body comprises a closed first edge located at one end of the rod body, and the size of the cross section of the first end is smaller than that of the rod body The size of the cross-section of connected, the inner edge of the first connecting surface is connected with the first holding surface. 4 . The homogenizing rod according to claim 3 , wherein the rod body comprises a closed second edge located at the other end of the rod body, and the size of the cross section of the second end is smaller than that of the rod. 5 . The size of the cross-section of the body, the edge of the second light-passing surface is located in the second edge; the second end further includes a second connecting surface, the outer edge of the second connecting surface and the second The edge is connected, and the inner edge of the second connecting surface is connected with the second holding surface. 5 . The homogenizing rod according to claim 3 , wherein the rod body comprises a closed second edge located at the other end of the rod body, and the size of the cross section of the second end is larger than that of the rod. 6 . The size of the cross-section of the body, the edge of the second light-passing surface is located outside the second edge; the second end further includes a second connecting surface, and the outer edge of the second connecting surface is connected to the second edge. The holding surface is connected, and the inner edge of the second connecting surface is connected with the second edge. 6 . The homogenizing rod according to claim 2 , wherein the rod body comprises a closed first edge located at one end of the rod body, and the size of the cross-section of the first end is larger than that of the rod body. 7 . The size of the cross-section of The inner edge of the first connection surface is connected with the first edge; the rod body includes a closed second edge located at the other end of the rod body, and the size of the cross-section of the second end is larger than The size of the cross-section of the rod body, the edge of the second light-transmitting surface is located outside the second edge; the second end further includes a second connecting surface, and the outer edge of the second connecting surface is connected to the second edge. The second holding surface is connected, and the inner edge of the second connecting surface is connected with the second edge. 7. An optical assembly, characterized in that, comprising: The homogenizing rod as claimed in any one of claims 1 to 6; The holder includes a first support plate and a second support plate, the first support plate is provided with a first installation hole, and the first support plate is matched with the first end through the first installation hole, so The second support plate is provided with a second installation hole, and the second support plate is matched with the second end through the second installation hole to hold the uniform light rod. 8 . The optical assembly of claim 7 , wherein the holder further comprises a housing, the housing comprises a side wall, and two ends of the side wall are respectively connected to the first support plate and the the second support plate, and the homogenizing rod is accommodated in the casing. 9 . The optical assembly of claim 8 , wherein an air gap exists between the side wall and the dodging rod. 10 . 10. A projection device, characterized by comprising the optical assembly according to any one of claims 7-9, wherein the optical assembly is provided in the projection device.