CN105607211B - Lens adjustment structure and projection optical system - Google Patents

Abstract

The invention discloses a lens adjusting structure and a projection optical system, wherein the lens adjusting structure comprises: the lens support, the base, the first preload piece, the second preload piece, the adjusting spring and the fastener; the lens support comprises an adjusting part and a supporting part; the adjusting part is provided with a first guide hole and a second guide hole which are respectively arranged at two sides of the supporting part; a first butt piece positioned between the first guide hole and the second guide hole is arranged on the lower surface of the adjusting part in a protruding mode; the base is provided with a first positioning piece and a second positioning piece; a through opening between the first positioning piece and the second positioning piece is formed in the base; a second butt joint piece positioned on one side of the through opening is arranged in the through opening; the invention avoids the problems of energy loss and the brightness performance reduction of the whole projection optical system caused by the deviation of the position of the laser convergence focus relative to the fluorescent powder coating of the fluorescent color wheel in the existing optical system.

Description

Lens adjustment structure and projection optical system

technical field

The invention relates to an optical element adjustment structure and an optical system with the optical element adjustment structure, in particular to a lens adjustment structure and a projection optical system.

Background technique

The optical system is a system composed of various optical elements in a certain order. It is generally used for imaging or optical processing. It can meet a series of requirements and obtain a high-quality optical system that meets the needs. It is not a simple combination of several optical elements. The parameters of each optical element must be reasonably configured and properly determined. In the prior art, due to errors in optical path calculation, mechanical processing technology, assembly technology, etc., the deviation of the optical system on the optical path is often caused, thereby affecting the performance of the optical system. As an important optical element in the optical system, the lens's position accuracy has a great impact on the optical path. Fig. 9 shows a schematic diagram of the positional relationship between the laser beam converged by the lens 36 and the fluorescent color wheel 5 in a theoretical state. Referring to Fig. 9, in a theoretical state, the laser beam converged by the lens 36 just converges on the fluorescent color wheel 5, FIG. 10 and FIG. 11 show a schematic diagram of the positional relationship between the laser beam converged by the lens 36 and the fluorescent color wheel 5 in practical applications. Referring to FIG. 10 and FIG. 11 , in practical applications In the process, due to the influence of various errors mentioned above, there will always be a certain deviation between the converging focal point of the laser light and the position of the phosphor powder coating of the fluorescent color wheel 5, which will result in insufficient laser efficiency of the phosphor powder and energy loss of the optical system. will increase, and the brightness performance of the entire projection optical system will decrease.

A projector is a device that can project images or videos onto a screen. The key to determining the quality of the projection often lies in the optical system of the projector. The projection optical system in the prior art has the following problems: because the focus of the laser light is relatively fluorescent. The position of the phosphor coating on the wheel will always have a certain deviation, the laser efficiency of the phosphor will be insufficient, the energy loss of the projection optical system will increase, and the brightness performance of the entire projection optical system will decrease.

Contents of the invention

In view of the above problems, the present invention develops a lens adjustment structure and projection optical system.

Technical means of the present invention is as follows:

A lens adjustment structure, comprising: a lens holder, a base, a first pretensioner, a second pretensioner, an adjustment spring and a fastener;

The lens holder includes an adjustment part placed horizontally and a support part vertically placed on the adjustment part; The first guide hole and the second guide hole on both sides of the support part; the first butt joint between the first guide hole and the second guide hole protrudes from the lower surface of the adjustment part;

The adjustment part is placed on the base in a detachable manner; the base has a first positioning piece and a second positioning piece; The through opening between the parts; the second butt joint located on one side of the through opening is arranged in the through opening; when the adjustment part of the lens holder is placed on the base, the first positioning part is placed In the first guide hole, the second positioning member is placed in the second guide hole, the first docking member passes through the through opening and is arranged opposite to the second docking member; the adjusting The spring is placed between the first butt joint and the second butt joint; through the first pretensioning piece and the second pretensioning piece respectively with the first positioning piece placed in the first guide hole, the second The second positioning piece in the guide hole is connected, and then the fastener is passed through the first butting piece and the spring is adjusted to be connected with the second butting piece;

Further, the length of the first guide hole is longer than the length of the first positioning member, and the first positioning member can move along the length direction of the first guide hole; the length of the second guide hole is longer than the length of the first positioning member. The length of the second positioning member, the second positioning member can move along the length direction of the second guide hole;

Further, a position indicating part is provided on the upper surface of the base, and the position indicating part is used for positioning the initial position of the adjusting part placed on the base;

Further, by adjusting the position of the first positioning piece in the first guide hole, the position of the second positioning piece in the second guiding hole, and adjusting the relative distance between the first docking piece and the second docking piece, the the location of the lens;

Further, both the upper surface of the base and the lower surface of the adjustment part are polished surfaces.

A projection optical system comprising:

A laser light source for emitting blue laser light;

A first converging optical system for converging the blue laser light emitted by the laser light source to the first reflection-transmission optical system;

A first reflective transmission optical system for transmitting the blue laser light converged by the first converging optical system to the second converging optical system;

The second converging optical system; the blue laser light transmitted by the first reflection and transmission optical system is converged to the fluorescent color wheel through the second converging optical system; the second converging optical system includes at least one lens; the lens has any of the above-mentioned A lens adjustment structure according to one item;

Fluorescent color wheel; the blue laser light converged by the second converging optical system passes through the fluorescent color wheel and is incident on the first total reflection mirror; the blue laser light converged by the second converging optical system is used as excitation light The fluorescent color wheel, so that the fluorescent color wheel emits green fluorescence and red fluorescence;

A first total reflection mirror for totally reflecting the incident blue laser light to a second total reflection mirror;

A second total reflection mirror for totally reflecting the incident blue laser light to the second reflection-transmission optical system;

The second reflection-transmission optical system; the second reflection-transmission optical system reflects the blue laser light totally reflected by the second total reflection mirror to the third converging optical system;

A third converging optical system for converging the blue laser light reflected by the second reflective and transmissive optical system to the homogenizing rod;

Homogenizing rod; the blue laser light converged by the third converging optical system enters the reflector after passing through the homogenizing rod;

Mirror; the uniform blue laser incident on the mirror enters the TIR prism after being reflected;

TIR prism; the blue laser entering the TIR prism is irradiated to the digital micromirror device after being refracted and reflected by the TIR prism;

and a digital micromirror device; the blue laser light irradiated on the digital micromirror device is reflected to the TIR prism again after passing through the digital micromirror device, and finally enters the projection lens;

The green fluorescent light and the red fluorescent light emitted by the fluorescent color wheel reach the first reflective-transmissive optical system after passing through the second converging optical system, and then reflect to the second reflective-transmissive optical system through the first reflective-transmissive optical system; The green fluorescent light and red fluorescent light reflected by the system are transmitted to the third converging optical system through the second reflective transmission optical system, and then reach the homogenizing rod after passing through the third converging optical system; the green fluorescent light collected by the third converging optical system The uniform green fluorescence and red fluorescence incident on the reflector enter the TIR prism after being reflected, and the green fluorescence and red fluorescence entering the TIR prism pass through the refraction of the TIR prism Irradiate to the digital micromirror device after reflection; the green fluorescent light and red fluorescent light irradiated on the digital micromirror device pass through the digital micromirror device and reflect to the TIR prism again, and finally enter the projection lens;

Further, the projection optical system also includes:

A first relay optical system placed between the fluorescent color wheel and the first total reflection mirror; the blue laser light transmitted through the fluorescent color wheel is transmitted to the first total reflection mirror through the first relay optical system;

The second relay optical system placed between the first total reflection mirror and the second total reflection mirror; the blue laser light totally reflected by the first total reflection mirror is transmitted to the second total reflection mirror through the second relay optical system ;

Further, the projection optical system also includes: a third relay optical system placed between the second total reflection mirror and the second reflection-transmission optical system; the blue laser light totally reflected by the second total reflection mirror passes through the second total reflection mirror The three relay optical systems are transmitted to the second reflection-transmission optical system;

Further, the projection optical system also includes: a fourth relay optical system placed between the dodging rod and the reflector; the uniform blue laser light formed after passing through the dodging rod is transmitted to the Reflector; the uniform green fluorescence and red fluorescence formed after passing through the homogenizing rod are transmitted to the reflector through the fourth relay optical system;

Further, the projection optical system also includes: a fifth relay optical system placed between the mirror and the TIR prism; the blue laser light reflected by the mirror is transmitted to the TIR prism through the fifth relay optical system; The green fluorescent light and red fluorescent light reflected by the mirror are transmitted to the TIR prism through the fifth relay optical system.

Due to the adoption of the above technical scheme, the lens adjustment structure and projection optical system provided by the present invention can adjust the corresponding lens position, correct the errors caused by optical path calculation, mechanical processing technology and assembly technology, and improve the performance of the optical system. The improvement will be of great help; the present invention has a simple structure, uses few parts, and the adjustment structure is outside the optical path of the optical system, which can prevent the light from harming the operator during the adjustment process. Through the adjustment of the lens adjustment structure, the first 2. The blue laser light converged by the converging optical system can just converge on the phosphor coating of the fluorescent color wheel, which ensures the laser efficiency of the phosphor and avoids the phosphor coating of the existing optical system due to the focus point of the laser relative to the fluorescent color wheel. There is a deviation in the position of the layer, resulting in energy loss and a decrease in the brightness performance of the entire projection optical system.

Description of drawings

Fig. 1 and Fig. 2 are the structure schematic diagrams of the lens adjustment structure of the present invention;

Figure 3 and Figure 4 are schematic structural views of the base of the present invention;

5 and 6 are schematic structural views of the lens holder of the present invention;

7 is a schematic structural view of the projection optical system of the present invention;

8 is a schematic diagram of the working principle between the lens and the fluorescent color wheel included in the second converging optical system of the present invention;

Fig. 9 is a schematic diagram of the positional relationship between the laser beam converged by the lens and the fluorescent color wheel in a theoretical state;

Figure 10 and Figure 11 are schematic diagrams of the positional relationship between the laser light converged by the lens and the fluorescent color wheel in practical applications;

Fig. 12 is a structural schematic diagram of the fluorescent color wheel of the present invention.

In the figure: 1. Laser light source, 2. First converging optical system, 3. First reflective transmission optical system, 4. Second converging optical system, 5. Fluorescent color wheel, 6. First relay optical system, 7. The first total reflection mirror, 8, the second relay optical system, 9, the second total reflection mirror, 10, the third relay optical system, 11, the second reflection transmission optical system, 12, the third convergence optical system, 13 , uniform light rod, 14, the fourth relay optical system, 15, reflector, 16, the fifth relay optical system, 17, TIR prism, 18, digital micromirror device, 19, projection lens, 20, adjustment part, 21. Support part, 22. Annular pressing piece, 23. First guide hole, 24. Second guide hole, 25. First docking part, 26. First positioning part, 27. Second positioning part, 28. Through opening , 29, the second butt joint, 30, the first preload, 31, the second preload, 32, the fastener, 33, the position indicator, 34, the adjustment spring, 35, the base, 36, the lens, 57. Blue light transmission area, 58, red phosphor area, 59, green phosphor area, B, blue laser, R, red fluorescence, G, green fluorescence.

Detailed ways

A lens adjustment structure as shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6 includes: a lens holder, a base 35, a first pretensioning member 30, a second pretensioning member 31, Adjustment spring 34 and fastener 32; Described lens holder comprises the adjustment part 20 that places horizontally and the support part 21 that vertically places on described adjustment part 20; 21 is tightly pressed and fixed; the adjustment part 20 has a first guide hole 23 and a second guide hole 24 respectively arranged on both sides of the support part 21; The first docking member 25 between a guide hole 23 and the second guide hole 24; the adjustment part 20 is placed on the base 35 in a detachable manner; the base 35 has a first positioning member 26 and the second positioning piece 27; the base 35 is provided with a through opening 28 between the first positioning piece 26 and the second positioning piece 27; The second docking part 29; when the adjustment part 20 of the lens holder is placed on the base 35, the first positioning part 26 is placed in the first guide hole 23, and the second positioning part 27 Placed in the second guide hole 24, the first butt joint 25 passes through the through opening 28 and is arranged opposite to the second butt joint 29; the adjustment spring 34 is placed on the first butt joint 25 and the second butt joint 29; through the first pretensioning piece 30 and the second pretensioning piece 31 respectively with the first positioning piece 26 placed in the first guide hole 23, placed in the second guide hole 24 The second positioning piece 27 in the middle is connected, and then is connected with the second butting piece 29 after passing through the first butting piece 25 and the adjustment spring 34 by the fastener 32; Further, the length of the first guide hole 23 is greater than The length of the first positioning member 26, the first positioning member 26 can move along the length direction of the first guide hole 23; the length of the second guide hole 24 is greater than the length of the second positioning member 27 , the second positioning member 27 can move along the length direction of the second guide hole 24; further, a position indicating part 33 is provided on the upper surface of the base 35, and the position indicating part 33 is used to guide the The adjustment part 20 is placed on the initial position on the base 35 for positioning; further, by adjusting the position of the first positioning member 26 in the first guide hole 23 and the position of the second positioning member 27 in the second guide hole 24 position, and adjust the relative distance between the first docking member 25 and the second docking member 29 to change the position of the lens 36; further, the upper surface of the base 35 and the lower surface of the adjustment part 20 are both polished surface.

A projection optical system as shown in Figure 7, comprising: a laser light source 1 for emitting blue laser light; The converging optical system 2; the first reflective transmission optical system 3 for transmitting the blue laser light converged by the first converging optical system 2 to the second converging optical system 4; the second converging optical system 4; The blue laser light transmitted by the transmission optical system 3 is converged to the fluorescent color wheel 5 through the second converging optical system 4; the second converging optical system 4 includes at least one lens 36; The lens adjustment structure; the fluorescent color wheel 5; the blue laser light converged by the second converging optical system 4 passes through the fluorescent color wheel 5 and is incident on the first total reflection mirror 7; it is converged by the second converging optical system 4 The blue laser light coming over is used as excitation light to irradiate the fluorescent color wheel 5, so that the fluorescent color wheel 5 emits green fluorescence and red fluorescence; Total reflection mirror 7; The second total reflection mirror 9 for totally reflecting the incident blue laser light to the second reflection and transmission optical system 11; The second reflection and transmission optical system 11; The second reflection and transmission optical system 11 will pass through The blue laser light totally reflected by the second total reflection mirror 9 is reflected to the third converging optical system 12; it is used for converging the blue laser light reflected by the second reflective transmission optical system 11 to the third converging rod 13 Optical system 12; uniform light rod 13; the blue laser light converged by the third converging optical system 12 is incident on the reflector 15 after being uniformly lighted by the uniform light rod 13; reflector 15; Uniform blue laser light enters TIR prism 17 after reflection; TIR prism 17; The blue laser light that enters TIR prism 17 irradiates digital micromirror device 18 after the refraction and reflection of TIR prism 17; And digital micromirror device 18; The blue laser light on the digital micromirror device 18 is reflected to the TIR prism 17 again after passing through the digital micromirror device 18, and finally enters the projection lens 19; the green fluorescence and red fluorescence emitted by the fluorescent color wheel 5 pass through the second converging optical After the system 4 reaches the first reflective-transmissive optical system 3, it is then reflected to the second reflective-transmissive optical system 11 by the first reflective-transmissive optical system 3; the green fluorescent light and red fluorescent light reflected by the first reflective-transmissive optical system 3 pass through The second reflective transmission optical system 11 is transmitted to the third converging optical system 12, and then reaches the homogenizing rod 13 after passing through the third converging optical system 12; The light bar 13 is incident to the reflector 15 after uniform light; the uniform green fluorescence and red fluorescence incident to the reflector 15 enter the TIR prism 17 after reflection, and the green fluorescence and red fluorescence entering the TIR prism 17 pass through the TIR prism 17. Irradiate the digital micromirror device 18 after catadioptric reflection; the green fluorescence and red fluorescence that irradiate on the digital micromirror device 18 pass through The digital micromirror device 18 is reflected to the TIR prism 17 again, and finally enters the projection lens 19; further, the projection optical system also includes: placed between the fluorescent color wheel 5 and the first total reflection mirror 7 The first relay optical system 6; the blue laser light transmitted through the fluorescent color wheel 5 is transmitted to the first total reflection mirror 7 by the first relay optical system 6; placed in the first total reflection mirror 7 and the second total reflection mirror The second relay optical system 8 between the mirrors 9; the blue laser light totally reflected by the first total reflection mirror 7 is transmitted to the second total reflection mirror 9 through the second relay optical system 8; further, the The projection optical system also includes: a third relay optical system 10 placed between the second total reflection mirror 9 and the second reflection-transmission optical system 11; the blue laser light totally reflected by the second total reflection mirror 9 passes through the third The relay optical system 10 transmits to the second reflection-transmission optical system 11; further, the projection optical system also includes: a fourth relay optical system 14 placed between the uniform light rod 13 and the reflector 15; The uniform blue laser light formed after the rod 13 is transmitted to the reflector 15 through the fourth relay optical system 14; the uniform green fluorescent light and red fluorescent light formed after passing through the uniform light rod 13 are transmitted to the reflection mirror 15; further, the projection optical system also includes: the fifth relay optical system 16 placed between the mirror 15 and the TIR prism 17; the blue laser light reflected by the mirror 15 passes through the fifth relay optical system The system 16 transmits to the TIR prism 17 ; the green fluorescent light and the red fluorescent light reflected by the mirror 15 are transmitted to the TIR prism 17 through the fifth relay optical system 16 .

The first converging optical system 2 of the present invention, the second converging optical system 4 and the third converging optical system 12 adopt the combination of convex lens and concave lens; the first relay optical system 6, the second relay optical system 8, the third relay optical system System 10 and the 4th relay optical system 14 adopt relay lens group, are used to finish the convergence, divergence and spatial modulation of laser beam; Described digital micromirror device 18 (DMD) contains digital micromirror array, and each digital micromirror array The switching state of the switch can be controlled, so that the light can be modulated correspondingly; the first reflection and transmission optical system 3 adopts the RG reflection DM mirror, that is, the anti-green, red and blue beam splitter; the second reflection and transmission optical system 11 adopts B reflection DM mirror, that is, anti-blue transparent red-green spectroscopic mirror; the laser light source 1 adopts a semiconductor laser diode; the fluorescent color wheel 5 rotates at a high speed during use; Holes, the adjustment spring 34 are connected with the threaded holes on the second butt joint 29; the first locating member 26 and the second locating member 27 adopt studs; the first preloading member 30, the second preloading member The member 31 and the fastener 32 adopt screws; the annular pressing piece 22 is held on the support part 21 by screws; the base 35 can be a part of the housing of the projection optical system. In Fig. 7, B, the dotted line, represents the blue laser, R, the square dotted line, represents the red fluorescence, and G, the dotted line, represents the green fluorescence.

FIG. 12 shows a schematic structural view of the fluorescent color wheel 5 of the present invention. As shown in FIG. 12 , the fluorescent color wheel 5 of the present invention has a blue light transmission area 57, a red phosphor area 58 and a green phosphor area 59; FIG. 8 is a schematic diagram of the working principle between the lens 36 included in the second converging optical system 4 of the present invention and the fluorescent color wheel 5. As shown in FIG. 8 , the blue laser light converges to the fluorescent color wheel 5 through the second converging optical system 4 , through the blue transmissive area, and simultaneously excite the red phosphor area 58 and the green phosphor area 59 to generate red fluorescence and green fluorescence respectively, the smaller the converged light spot on the phosphor coating, the more concentrated the energy, and the phosphor The higher the excitation efficiency, the higher the energy that can be produced, and finally the higher the brightness reflected in the overall optical performance; the present invention configures the lens adjustment structure for the lens 36 in the second converging optical system 4, so that the blue laser The location of the converging focal point is located on the phosphor coating of the phosphor color wheel 5, so as to achieve the highest efficiency of phosphor excitation.

The positioning, guiding and adjustment of the lens holder in the present invention are all parallel to the optical path direction of the optical system, specifically, parallel to the axial direction of the lens 36, the first positioning member 26 and the second positioning member 27 provided on the base 35, Respectively correspond to the first guide hole 23 and the second guide hole 24 on the adjustment part 20, and play an axial guiding role; the first butt joint 25 passing through the through opening 28 is arranged opposite to the second butt joint 29, and The relative distance between the first docking member 25 and the second docking member 29 is changed by installing the fastener 32 and adjusting the fastener 32 . The specific adjustment process of the lens 36 is as follows: the lens holder is installed on the base 35, the adjustment part 20 is placed on the initial position on the base 35 according to the mark of the position indicating part 33, and the first pretensioning member 30 and the The first positioning piece 26 placed in the first guide hole 23 is connected, and the second pretensioning piece 31 is connected with the second positioning piece 27 placed in the second guide hole 24 for preloading, so that the lens holder It can move relative to the base 35 but is not completely fastened. Connect the first docking part 25 and the second docking part 29 through the fastener 32, and rotate the fastener 32 to realize the axial fine adjustment of the lens holder. After the adjustment is completed, it is completely Tighten the first pretensioner 30 and the second pretensioner 31 to fix the final position of the lens holder; the upper surface of the base 35 and the lower surface of the adjustment part 20 are polished surfaces to ensure the continuous adjustment of the lens holder Smooth; the first pretensioning part 30 and the second pretensioning part 31 take into account the functions of pretensioning and fixing.

The lens adjustment structure and projection optical system provided by the present invention can adjust the position of the corresponding lens, correct the errors caused by optical path calculation, mechanical processing technology and assembly technology, etc., which will greatly improve the performance of the optical system. Help; the present invention has a simple structure, few parts, and the adjustment structure is outside the optical path of the optical system, which can prevent the light from harming the operator during the adjustment process. Through the adjustment of the lens adjustment structure, the second converging optical system converges The blue laser can just converge on the phosphor coating of the fluorescent color wheel, which ensures the laser efficiency of the phosphor and avoids the deviation of the laser focus point relative to the phosphor coating of the fluorescent color wheel in the existing optical system. The resulting energy loss and degradation of the brightness performance of the entire projection optical system.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (10)

1. A lens adjustment structure, characterized in that the lens adjustment structure comprises: a lens holder, a base, a first pretensioner, a second pretensioner, an adjustment spring and a fastener; The lens holder includes an adjustment part placed horizontally and a support part vertically placed on the adjustment part; The first guide hole and the second guide hole on both sides of the support part; the first butt joint between the first guide hole and the second guide hole protrudes from the lower surface of the adjustment part; The adjustment part is placed on the base in a detachable manner; the base has a first positioning piece and a second positioning piece; The through opening between the parts; the second butt joint located on one side of the through opening is arranged in the through opening; when the adjustment part of the lens holder is placed on the base, the first positioning part is placed In the first guide hole, the second positioning member is placed in the second guide hole, the first docking member passes through the through opening and is arranged opposite to the second docking member; the adjusting The spring is placed between the first butt joint and the second butt joint; through the first pretensioning piece and the second pretensioning piece respectively with the first positioning piece placed in the first guide hole, the second The second positioning piece in the guide hole is connected, and then the fastener is passed through the first butting piece and the adjustment spring to be connected with the second butting piece. 2. The lens adjustment structure according to claim 1, characterized in that the length of the first guide hole is greater than the length of the first positioning member, and the first positioning member can move along the length of the first guide hole direction movement; the length of the second guide hole is greater than the length of the second positioning member, and the second positioning member can move along the length direction of the second guide hole. 3. The lens adjustment structure according to claim 1, characterized in that a position indicating part is arranged on the upper surface of the base, and the position indicating part is used to set the initial position of the adjusting part on the base to locate. 4. The lens adjustment structure according to claim 1, characterized in that by adjusting the position of the first positioning member in the first guide hole, the position of the second positioning member in the second guide hole, and adjusting the first butt joint The relative distance between the lens and the second docking member is used to change the position of the lens. 5. The lens adjustment structure according to claim 1, characterized in that both the upper surface of the base and the lower surface of the adjustment part are polished surfaces. 6. A projection optical system, characterized in that the projection optical system comprises: A laser light source for emitting blue laser light; A first converging optical system for converging the blue laser light emitted by the laser light source to the first reflection-transmission optical system; A first reflective transmission optical system for transmitting the blue laser light converged by the first converging optical system to the second converging optical system; The second converging optical system; the blue laser light transmitted by the first reflective and transmissive optical system is converged to the fluorescent color wheel through the second converging optical system; the second converging optical system includes at least one lens; the lens has claims The lens adjustment structure described in any one of 1 to 5; Fluorescent color wheel; the blue laser light converged by the second converging optical system passes through the fluorescent color wheel and is incident on the first total reflection mirror; the blue laser light converged by the second converging optical system is used as excitation light The fluorescent color wheel, so that the fluorescent color wheel emits green fluorescence and red fluorescence; A first total reflection mirror for totally reflecting the blue laser light emitted by the fluorescent color wheel to a second total reflection mirror; A second total reflection mirror for totally reflecting the blue laser light emitted by the first total reflection mirror to the second reflection-transmission optical system; The second reflection-transmission optical system; the second reflection-transmission optical system reflects the blue laser light totally reflected by the second total reflection mirror to the third converging optical system; A third converging optical system for converging the blue laser light reflected by the second reflective and transmissive optical system to the homogenizing rod; Homogenizing rod; the blue laser light converged by the third converging optical system enters the reflector after passing through the homogenizing rod; Mirror; the uniform blue laser incident on the mirror enters the TIR prism after being reflected; TIR prism; the blue laser entering the TIR prism is irradiated to the digital micromirror device after being refracted and reflected by the TIR prism; and a digital micromirror device; the blue laser light irradiated on the digital micromirror device is reflected to the TIR prism again after passing through the digital micromirror device, and finally enters the projection lens; The green fluorescent light and the red fluorescent light emitted by the fluorescent color wheel reach the first reflective-transmissive optical system after passing through the second converging optical system, and then reflect to the second reflective-transmissive optical system through the first reflective-transmissive optical system; The green fluorescent light and red fluorescent light reflected by the system are transmitted to the third converging optical system through the second reflective transmission optical system, and then reach the homogenizing rod after passing through the third converging optical system; the green fluorescent light collected by the third converging optical system The uniform green fluorescence and red fluorescence incident on the reflector enter the TIR prism after being reflected, and the green fluorescence and red fluorescence entering the TIR prism pass through the refraction of the TIR prism After being reflected, it irradiates the digital micromirror device; the green fluorescent light and the red fluorescent light irradiated on the digital micromirror device pass through the digital micromirror device, reflect to the TIR prism again, and finally enter the projection lens. 7. The projection optical system according to claim 6, characterized in that the projection optical system further comprises: A first relay optical system placed between the fluorescent color wheel and the first total reflection mirror; the blue laser light transmitted through the fluorescent color wheel is transmitted to the first total reflection mirror through the first relay optical system; The second relay optical system placed between the first total reflection mirror and the second total reflection mirror; the blue laser light totally reflected by the first total reflection mirror is transmitted to the second total reflection mirror through the second relay optical system . 8. The projection optical system according to claim 6, characterized in that the projection optical system further comprises: a third relay optical system placed between the second total reflection mirror and the second reflection-transmission optical system; The blue laser light totally reflected by the two total reflection mirrors is transmitted to the second reflection and transmission optical system through the third relay optical system. 9. The projection optical system according to claim 6, characterized in that the projection optical system further comprises: a fourth relay optical system placed between the dodging rod and the mirror; The blue laser light is transmitted to the reflector through the fourth relay optical system; the uniform green fluorescence and red fluorescence formed after passing through the uniform rod are transmitted to the reflector through the fourth relay optical system. 10. The projection optical system according to claim 6, characterized in that the projection optical system further comprises: a fifth relay optical system placed between the reflector and the TIR prism; the blue laser light reflected by the reflector It is transmitted to the TIR prism through the fifth relay optical system; the green fluorescence and red fluorescence reflected by the mirror are transmitted to the TIR prism through the fifth relay optical system.