CN1779551A - Optical engine and projection device with the optical engine - Google Patents

Abstract

The invention discloses an optical engine which is suitable for being arranged in a projection device. The optical engine includes: a light source, a tapered rod, at least a light-focusing component, a prism group, a dynamic display device (DMD) and a projection lens group. One end of the tapered rod is adjacent to the light source, and the light emitted by the light source can be guided by the tapered rod to advance along an optical axis direction. The cross section of the tapered rod perpendicular to the direction of the optical axis is substantially gradually enlarged along the direction far away from the light source, so that the angle of light divergence can be reduced, and the effects of enabling the light to be uniform and improving the brightness can be achieved. The prism group comprises a first prism with a right-angled triangle section and a second prism with a wedge-shaped section which are superposed. The light from the light gathering component can be folded to the dynamic display device and reflected, then the prism group can fold the light to the projection lens group, and the light can be focused to form an image on an external projection surface.

Description

Optical engine and projection device with the optical engine

technical field

The invention relates to an optical engine, especially an optical engine which is suitable for being installed in an optical projection device and includes components such as a light source, several lenses and prisms, and can be used to generate optical images.

Background technique

For an optical projection device (Image Projector), the quality of the projected optical image is closely related to the design of the optical engine (Optical Engine) inside the optical projection device. In order to obtain better image quality, the design of the optical engine must be able to take into account the brightness, uniformity and efficiency of the light source, and when the light travels between the lenses or prisms in the optical engine, the light should be prevented from being distorted and causing the image Distortion, or image blurring or loss of contrast caused by low light. In traditional technology, in order to make the light emitted by the light source more uniform, a large number of optical lenses, polarizers or beam splitters are used in front of the light source. However, this sacrifices the brightness and efficiency of the light. As a result, traditional technologies are forced to use higher power and higher brightness light sources to achieve the desired image quality. And this is also one of the main reasons why the energy consumption and space volume of the optical engine of the conventional technology cannot be effectively reduced.

Contents of the invention

The main purpose of the present invention is to provide an optical engine, which has the advantages of more uniform light emitted by the light source, higher light use efficiency, relatively fewer lenses and prisms, relatively high image quality, and low energy consumption. Its spatial volume is relatively small.

Another object of the present invention is to provide an optical engine having a light source module. A tapered rod is arranged on the light source module. The cross-section of the tapered rod perpendicular to the optical axis substantially becomes larger along the direction away from the light source, so the angle of light divergence can be reduced and the effects of uniform light and increased brightness can be achieved.

Another object of the present invention is to provide an optical engine having a prism group. The prism group includes: a first prism closer to the condensing lens and a second prism farther away from the condensing lens, the first prism is a wedge-shaped prism whose cross-section along the direction of light travel is conical, and the second prism is along the The cross-section in the light traveling direction is a right triangle, and the first prism abuts on the surface where a long side of the right triangle cross-section of the second prism belongs. By rotating the relative positions of the first prism and the second prism, the angle and direction of light bending can be controlled and fine-tuned.

Another object of the present invention is to provide an optical projection device with the aforementioned optical engine.

To achieve the above purpose, the optical engine of the present invention includes: a light source, a tapered rod, at least one light-condensing component, a prism group, a dynamic display device (DMD) and a projection lens group. One end of the tapered rod is adjacent to the light source, and the light emitted by the light source can be guided by the tapered rod to advance along an optical axis. The cross-section of the tapered rod perpendicular to the optical axis substantially becomes larger along the direction away from the light source, so the angle of light divergence can be reduced and the effects of uniform light and increased brightness can be achieved. The prism group includes a first prism with a right-angled triangle section and a second prism with a wedge-shaped section superimposed. The light from the condensing component can be bent to the dynamic display device and reflected by it, and then the light can be bent to the projection lens group by the prism group and focused for imaging on an external projection surface.

The present invention will be described in detail below in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a perspective view of a preferred embodiment in which the optical engine of the present invention is arranged in a projection device;

Fig. 2 is an exploded perspective view of a preferred embodiment of the optical engine of the present invention;

Fig. 3 is an exploded perspective view of the optical engine shown in Fig. 2 at another viewing angle;

FIG. 4 is a schematic diagram of an optical path disclosing the optical engine shown in FIG. 2;

Fig. 5 is the perspective view of the preferred embodiment of the first prism of the prism group of the present invention;

Fig. 6 is the perspective view of the preferred embodiment of the second prism of the prism group of the present invention;

Fig. 7 is the perspective view of the preferred embodiment of the prism carrier plate of the prism group of the present invention;

Fig. 8 is an exploded perspective view of the first preferred embodiment of the light source module of the optical engine shown in Fig. 2;

Fig. 9 is a schematic diagram of an embodiment of the optical path when the tapered rod in the optical engine of the present invention performs light reflection;

10 is an exploded perspective view of a second preferred embodiment of the light source module of the optical engine of the present invention;

11 is an exploded perspective view of a third preferred embodiment of the light source module of the optical engine of the present invention;

Fig. 12 is an assembled perspective view of the third preferred embodiment of the light source module shown in Fig. 11 when it is combined with a heat dissipation assembly;

Fig. 13 is a perspective view of the combination of the third preferred embodiment of the light source module shown in Fig. 12, the base, the concave mirror, the condenser lens and the prism group.

Description of reference numerals: 1 projection device; 10 optical engine; 11, 11a, 11b light source module; 111 light source; 112, 112a, 112b tapered rod; 1121, 1121a narrow and long surface; ; 1126 bump; 1127, 1127b flange structure; 113, 113a light reflection material; 114 circuit board; 1142 connector; 115, 115a, 115b fixed seat; 1151 hollow groove; Elastic clip; 1161 jaw; 1162 fastener; 1163 set hole; 117 cooling assembly; 1171 cooling contact surface; 1172 cooling fin; 1173 raised surface; 118, 118b positioning sleeve; 12 concave mirror; 13 condenser lens; 14 prism group; 141 first prism; 1411-1416 surface plane; 142 second prism; 1421-1425 surface plane; Stud; 144 spring; 15 dynamic display device; 151 DMD chip; 152 DMD socket; 153 DMD circuit board; 154 DMD power connection seat; 16 projection lens group; 161 lens; 162 aperture; 163 rubber sleeve; Base; 171 right cover; 172 lower cover; 173 first space; 174 V-shaped lower recess; 175 prism lower shield; 176 lower groove; 177 extension frame; 18 upper cover; 182 prism upper shutters; 20 circuit board modules; 21 connection interfaces; 30 heat dissipation modules; 31 heat dissipation fans; 32 heat dissipation air outlets; 40 operation interface modules; 41 buttons;

Detailed ways

Please refer to FIG. 1 which is a perspective view of a preferred embodiment of an optical engine 10 of the present invention disposed in a projection device 1 (ImageProjector). The projection device 1 generally includes: an optical engine 10 (Optical Engine) of the present invention, a circuit board module 20 (PCB Module), a heat dissipation module 30 (Heat Sink Module), an operation interface module 40 (Human Interface Module), and A casing 50 (Casing).

The optical engine 10 is used to generate and project optical images, which is the main technical feature of the present invention. The circuit board module 20 is connected to the optical engine 10 to control the operation of the optical engine 10 . Several connection interfaces 21 are provided in the circuit board module 20 for connecting external devices (such as computers, optical drives or other video playback devices, or memory cards, etc., not shown in the figure). The heat dissipation module 30 dissipates heat from the optical engine 10 and the circuit board module 20 , and has at least one heat dissipation fan 31 , properly designed heat dissipation channels, and at least one heat dissipation air outlet 32 . The operation interface module 40 is connected to the circuit board module 20 for operating the projection device 1 . Generally speaking, at least some control buttons 41 or switches are arranged on the operation interface module 40 . The outer shell 50 accommodates the optical engine 10 , the circuit board module 20 , the cooling module 30 and the operation interface module 40 .

Please refer to a preferred embodiment of the optical engine 10 of the present invention shown in FIG. 2 , FIG. 3 and FIG. 4 . 2 is an exploded perspective view of a preferred embodiment of the optical engine 10 of the present invention, and FIG. 3 is an exploded perspective view of the optical engine 10 shown in FIG. 2 at another viewing angle. As for FIG. 4 , a schematic diagram of the optical path of the optical engine 10 shown in FIG. 2 is disclosed.

As shown in Figures 2 to 4, the optical engine 10 includes: a light source module 11 (IlluminatorModule), a concave mirror 12 (Concave Mirror), a condenser lens 13 (Condenser), a prism group 14 (Prism Module), A dynamic display device 15 (Dynamic Monitoring Device; DMD), and a projection lens set 16 (Projection Lens Set) composed of several lenses 161 and an aperture 162. The light emitted from the light source 111 of the light source module 11 first passes through the tapered rod 112 of the light source module 11 to reduce the divergence angle of the light, and then the concave mirror 12 bends and gathers the light in a predetermined direction, and then condenses the light. After lens 13 gathers, by prism group 14, light beam is refracted and shoots to this dynamic display device 15, and after dynamic display device 15 is reflected and develops an image, by prism group 14 again, light is folded to projection lens group 16, and be focused to For imaging on an external projection surface 91 .

In order to precisely position the aforementioned components, the optical engine 10 of the present invention is designed with a unique positioning mechanism. As shown in FIGS. 2 and 3 , the optical engine 10 further includes: a base 17 and an upper cover 18 . In this embodiment, the base 17 and the upper cover 18 are preferably made of plastic material by injection molding. The base 17 also includes a right cover 171 and a bottom cover 172 . The right cover 171 also forms a first space 173 for accommodating the dynamic display device 15 . Then form a V-shaped lower recess 174, a prism lower shield 175 adjacent to the right cover 171, and a lower prism between the V-shaped lower recess 174 and the prism lower shield 175 in the lower cover 172. Groove 176. The upper cover 18 can be combined with the lower cover 172 of the base 17 . A V-shaped upper recess 181, a prism upper shield 182 and an upper groove (not shown) are also provided on the upper cover 18, and the V-shaped upper recess 181, the prism upper shield 182 The shape and position of the upper concave groove correspond to the V-shaped lower concave seat 174 , the lower prism shield 175 and the lower concave groove 176 respectively. When the upper cover 18 is closed on the lower cover 172 , an accommodating space can be formed between the upper and lower covers 18 , 172 . When the optical engine 10 of the present invention is to be combined, the prism group 14 is accommodated between the prism upper shield 182 and the prism lower shield 175, and the condenser lens 13 is accommodated between the upper concave groove and the lower concave groove 176. , the concave mirror 12 is accommodated at the turning position of the V-shaped upper recess 181 and the V-shaped lower recess 174, and a tail end of the V-shaped upper recess 181 and the V-shaped lower recess 174 accommodates the cone Shaped bar 112, fixed seat 115 and elastic clip 116. In addition, a prism supporting plate 143 and a spring 144 are disposed on the lower surface of the prism group 14 for positioning and fine-tuning the relative position of the prism group 14 . In this way, by utilizing the unique structure design of the base 17 and the upper cover 18 of the present invention, each component can be quickly, easily and accurately combined and positioned at a predetermined angle, relative position and distance.

As shown in Figure 3, the dynamic display device 15 also includes: a DMD chip 151, a DMD socket 152 for inserting the DMD chip 151, a DMD circuit board 153 combined with the DMD socket 152, and a DMD circuit board 153 combined with the DMD socket 152. The DMD power connection socket 154 of the DMD circuit board 153 . When the dynamic display device 15 is assembled to the right cover 171 of the base 17 , the DMD chip 151 can be exposed at a window in the center of the first space 173 for receiving light from the prism group 14 . The projection lens set 16 is located at an open side between the prism upper shield 182 and the prism lower shield 175 , and further includes a rubber sleeve 163 and a buckle 164 . The rubber sleeve 163 can be placed outside the lens group 16 , and the outer contour of the rubber sleeve 163 can correspond to fill the space between the prism upper shield 182 and the prism lower shield 175 to avoid light interference. The buckle 164 can lock the lens group 16 on an extension frame 177 of the right cover 171 .

Please refer to FIG. 5 , FIG. 6 , and FIG. 7 , and refer to FIGS. 2 to 4 . Wherein, FIG. 5 is a perspective view of a preferred embodiment of the first prism 141 of the prism group 14 of the present invention. FIG. 6 is a perspective view of a preferred embodiment of the second prism 142 of the prism set 14 of the present invention. FIG. 7 is a perspective view of a preferred embodiment of the prism support plate 143 of the prism set 14 of the present invention. In this preferred embodiment, the prism group 14 is a reversed total internal reflection (Reversed Total Internal Reflection, RTIR) prism group, which also includes: a first prism 141 and a second prism 142. The first prism 141 is disposed at a position closer to the condenser lens 13 , and the second prism 142 is disposed at a position closer to the dynamic display device 15 . Moreover, the first prism 141 and the second prism 142 are both made of transparent material with a predetermined refractive index.

As shown in FIG. 5, the first prism 141 is a wedge-shaped prism (Wedge Prism), and its cross-section along the light traveling direction is a cone shape (as shown in FIG. 4 ). The six surface planes 1411 - 1416 of the wedge-shaped first prism 141 are all planes, and the surface planes 1411 - 1416 are not parallel to each other, but have a wedge-shaped structure connected obliquely. The surface plane 1413 is the incident surface of the light, and the surface plane 1416 is the outgoing surface of the light. As shown in Figure 5, the junction position of the four surface planes 1411, 1412, 1413 and 1416 of the first prism 141 has the thinnest thickness (that is, the distance between the surface planes 1413 and 1416 is the shortest at this position), and the four surface planes The intersection position of 1413, 1414, 1415 and 1416 has the greatest thickness (that is, the distance between the surface planes 1413 and 1416 is the farthest at this position).

As shown in FIG. 6 , the cross section of the second prism 142 along the light traveling direction is a right triangle, and has five surface planes 1421 - 1425 . Wherein, the surface planes 1424 and 1425 are right triangles and parallel to each other, and the surface plane 1421 is located between the long sides of the two right triangle surface planes 1424 and 1425 and is an incident surface of light. The surface planes 1422 and 1423 are located between two vertical sides of the surface planes 1424 and 1425 respectively, and the surface planes 1422 and 1423 are perpendicular to each other. The surface plane 1416 of the first prism 141 is attached to the surface plane 1421 of the second prism 142 (that is, the surface to which a long side of a right triangle in section belongs). The dynamic display device 15 and the projection lens group 16 are respectively adjacent to the surface planes 1423 and 1422 of the second prism 142 (that is, the two surfaces to which the two vertical sides of the right triangle in cross section belong).

As shown in FIG. 7 , the prism supporting plate 143 has a right triangle top plane 1431 for supporting the surface plane 1425 of the second prism 142 . The prism support plate 143 and the second prism 142 can be bonded with adhesive. A plurality of resisting blocks 1432 can be disposed on the periphery of the top plane 1431 of the prism supporting plate 143 to prevent the second prism 142 from slipping. A stud 1433 is provided under the prism support plate 143 for locking a screw (not shown) to the prism lower shield 175 of the base 17 . By rotating the fine-tuning screw, the relative position and angle between the first prism 141 and the second prism 142 can be slightly changed, so as to achieve the purpose of fine-tuning the path and angle of light.

Please refer to FIG. 8 which is an exploded perspective view of the first preferred embodiment of the light source module 11 of the optical engine 10 shown in FIG. 2 . The light source module 11 includes: a light source 111 , a tapered rod 112 , a light reflection device, a circuit board 114 , a fixing seat 115 , and an elastic clip 116 . The light source module is combined with a heat dissipation component 117 to promote heat dissipation.

The light source 111 is used for emitting light toward a predetermined optical axis direction. In the present invention, the light source 111 is a light emitting diode (Light Emitting Diode). One end of the tapered rod 112 is adjacent to the light source 111 . The tapered rod 112 has a plurality of elongated surfaces 1121 extending along the optical axis, so that the cross-section of the tapered rod 112 perpendicular to the optical axis presents a polygonal profile. In this preferred embodiment, the cross section of the tapered rod 112 perpendicular to the optical axis has a square profile. Each elongated surface 1121 has two opposite long sides 1122 , 1123 substantially extending along the optical axis, and two opposite short sides 1124 , 1125 substantially perpendicular to the optical axis. Moreover, the length of the short side 1125 of each elongated surface 1121 closer to the light source 111 is shorter than the length of the other short side 1124 farther away from the light source 111 . Therefore, the cross section of the tapered rod 112 substantially increases gradually along the direction away from the light source 111 . The concave mirror 12 is disposed at the end of the tapered rod 112 with the largest cross-section.

The light reflection device is implemented on each elongated surface 1121 of the tapered rod, so that the light emitted by the light source can be reflected by each elongated surface 1121 and guided along the direction of the optical axis. In the preferred embodiment shown in FIG. 8 , the tapered rod 112 is a hollow tapered structure made of transparent material, such as but not limited to: glass, plastic, crystal, or quartz. And, the light reflection device forms a light reflection material 113 (such as silver, etc.) on the inner side of each narrow and long surface 1121 of the hollow tapered rod 112, so that the light can be totally reflected in the hollow tapered rod 112, and automatically The end of the smaller section of the tapered rod 112 advances towards the end of the larger section. In this way, the tapered rod 112 of the present invention can achieve the effect of guiding the light substantially along the direction of the optical axis.

The circuit board 114 is used to carry the light source 111 (LED), and is provided with a plurality of electronic components for driving the light source 111 (LED) and a connector 1142 . The fixing seat 115 is combined with the circuit board 114 . A roughly square hollow groove 1151 is provided on the fixing base 115, which can be inserted into the smaller section end of the tapered rod 112, and the position of the light source 111 just corresponds to the smaller section of the tapered rod 112. section end. Moreover, the fixing seat 115 also has two legs 1152, 1153 and a sliding groove 1154 between the two legs, the size of the sliding groove 1154 corresponds to the size of the circuit board 114, so that the circuit board 114 can slide into the The sliding groove 1154 is combined with the fixing seat 115 .

The elastic clip 116 can clamp and position the tapered rod 112 on the fixing seat 115 . In this preferred embodiment, the elastic clip 116 has: several jaws 1161 , at least one fastener 1162 on one of the jaws 1161 , and a set of holes 1163 between each jaw 1161 . The size of the sleeve hole 1163 is greater than the size of the largest cross-section of the tapered rod 112. By covering the sleeve hole 1163 of the elastic clip 116 on the tapered rod 112 and making at least one clamping claw 1161 clamp the edge of the fixing seat 115, The tapered rod 112 can be combined and positioned on the fixing seat 115 . In this preferred embodiment, at least one elongated surface 1121 of the tapered rod 112 can be provided with a protrusion 1126, when the sleeve hole 1163 of the elastic clip 116 is sleeved on the tapered rod 112, the protrusion 1126 can just resist Lean against the elastic clip 116 and the fixing seat 115 to avoid displacement.

The heat dissipation component 117 has a heat dissipation contact surface 1171 and a plurality of heat dissipation fins 1172 extending from the heat dissipation contact surface 1171 , and a protrusion surface 1173 of a predetermined shape is further provided on the heat dissipation contact surface 1171 . Wherein, the fixing seat 115 and the circuit board 114 are combined on the heat dissipation contact surface 1171, and the position of the raised surface 1173 is just located in a gap formed between the two legs 1152, 1153, so that the circuit board 114 The position carrying the light source 111 (light emitting diode) can directly contact the raised surface 1173 on the heat dissipation contact surface 1171 .

Please refer to FIG. 9 which is a schematic diagram of an embodiment of the optical path when the tapered rod 112 in the optical engine of the present invention performs light reflection. The unique structure of the tapered rod 112 of the present invention has the effect of narrowing the light divergence angle. As shown in Figure 9, after light enters the tapered rod 112 at an angle of θ1 from the end of the smaller cross-section, since the tapered rod 112 gradually becomes thicker along the traveling direction of the light at an angle of θ3 (that is, the cross-section gradually increases), so When light exits at an angle of θ2 at the end of the larger section, the value of θ2 will be smaller than θ1. In this way, the aforementioned effects of narrowing the light divergence angle, further concentrating the light source, making the light source distribution uniform, and improving the light source utilization efficiency can be achieved.

In other preferred embodiments of the present invention described below, most components are the same or similar to the foregoing embodiments. Therefore, only an English letter is added after the original number to distinguish it.

Please refer to FIG. 10 which is an exploded perspective view of a second preferred embodiment of the light source module 11a of the optical engine of the present invention. The light source module 11a shown in Figure 10 is generally similar to the light source module 11 shown in Figure 8, and also includes: a light source 111 (light emitting diode), a tapered rod 112a, a light reflection device, a circuit board 114, and a fixing seat 115a, and the elastic clip 116. The light source module 11a is also combined with a heat dissipation component 117 to promote heat dissipation. The difference of the light source module 11a shown in FIG. 10 is that the light source module 11a further includes a hollow positioning sleeve 118 , and the end of the tapered rod 112a with the largest cross section is further provided with a flange structure 1127 . The tapered rod 112a is inserted into the hollow positioning sleeve 118, and the flange structure 1127 is positioned at an upper inner edge 1181 of the positioning sleeve 118, and the other end of the sleeve 118 is connected by combining The component 1182 is combined and positioned on the circuit board 114 and the fixing base 115a. Moreover, the tapered rod 112a is a solid tapered structure, and the light reflection device forms a light reflective material layer 113a on each of the outer elongated surfaces 1121a of the solid tapered rod 112a. In addition, the flange structure 1127 of the tapered rod 112a is integrally formed with the tapered rod 112a itself.

Please refer to FIG. 11 which is an exploded perspective view of a third preferred embodiment of the light source module 11b of the optical engine of the present invention. The light source module 11b shown in Figure 11 is generally similar to the light source module 11a shown in Figure 10, and also includes: a light source 111 (light emitting diode), a tapered rod 112b, a light reflection device, a circuit board 114, and a fixing seat 115b, the elastic clip 116, and the positioning sleeve 118b. The difference of the light source module 11b shown in FIG. 11 is that the flange structure 1127b of the tapered rod 112b is an independent component, and the flange structure 1127b is a sheet-shaped element of a transparent material (such as glass or plexiglass) and Its size is slightly larger than the largest cross-section of the tapered rod 112b, and the flange structure 1127b is fixed on the tapered rod 112b in an adhesive manner.

FIG. 12 is an assembled perspective view of the third preferred embodiment of the light source module 11 b shown in FIG. 11 when it is combined with the heat dissipation assembly 117 .

FIG. 13 is a combined perspective view when the third preferred embodiment of the light source module 11 b shown in FIG. 12 is combined with the base 17 , the concave mirror 12 , the condenser lens 13 and the prism group 14 .

Claims (25)

1. An optical engine, comprising: a light source for emitting light toward a predetermined optical axis; A tapered rod, one end of which is adjacent to the light source, the tapered rod has several long and narrow surfaces extending along the optical axis, so that the cross section of the tapered rod perpendicular to the optical axis presents a polygonal profile, and each long and narrow surface has Two relatively long sides extending generally along the optical axis direction, and two relatively short sides substantially perpendicular to the optical axis, and the length of the short side of each elongated surface closer to the light source is smaller than the length of the other short side farther away from the light source length, so that the cross-section of the tapered rod becomes substantially larger away from the light source; and, The light reflection device is implemented on each elongated surface of the tapered rod, so that the light emitted by the light source can be reflected by each elongated surface and guided along the direction of the optical axis. 2. The optical engine as claimed in claim 1, wherein the tapered rod is a hollow tapered structure, and the light reflecting device forms a light reflecting material on each narrow surface inside the hollow tapered rod. 3. The optical engine as claimed in claim 1, wherein the tapered rod is a solid tapered structure, and the light reflecting device forms a light reflecting material on each elongated surface outside the solid tapered rod. 4. The optical engine as claimed in claim 1, wherein the tapered rod is made of transparent material. 5. The optical engine according to claim 1, wherein the light source, the tapered rod and the light reflection device constitute a light source module, and the light source module further comprises: a light emitting diode for emitting the light; a circuit board for carrying the light emitting diode; a fixing seat, combined with the circuit board, the fixing seat has a hollow groove which can be inserted into one end of the tapered rod, and the position of the light emitting diode just corresponds to the end of the tapered rod; and, An elastic clip can clamp and locate the tapered rod on the fixed seat. 6. The optical engine as claimed in claim 5, wherein the fixing base further has a bipod and a sliding slot between the bipods, the size of the sliding slot corresponds to the size of the circuit board for the circuit The plate slides into the chute and engages with the holder. 7. The optical engine according to claim 6, wherein the optical engine further comprises a heat dissipation component, the heat dissipation component has a heat dissipation contact surface and a plurality of heat dissipation fins extending from the heat dissipation contact surface, on the heat dissipation contact There is also a raised surface with a predetermined shape on the surface, wherein the fixing seat and the circuit board are combined on the heat dissipation contact surface, and the position of the raised surface is just located in a gap formed between the two legs, so as to The positions where the circuit board carries the light-emitting diodes can directly contact the raised surface. 8. The optical engine as claimed in claim 5, wherein the elastic clip further has: several claws, at least one fastener is located on one of the claws, and a set of holes between each claw, the The size of the sleeve hole is larger than the size of the largest cross-section of the tapered rod. By putting the sleeve hole of the elastic clip on the tapered rod and making at least one jaw clamp the fixed seat, the tapered rod can be combined and positioned on the on the fixed seat. 9. The optical engine as claimed in claim 5, wherein the light source module further comprises a hollow positioning sleeve, and the end of the tapered rod having the largest cross-section is provided with a flange structure, and the tapered rod passes through the and the flange structure is positioned at one end of the positioning sleeve, and the other end of the sleeve is combined and positioned on the circuit board and the fixing seat. 10. The optical engine as claimed in claim 9, wherein the flange structure of the tapered rod is an independent component, the flange structure is a sheet-like element of transparent material and its size is slightly larger than the largest cross-section of the tapered rod . 11. The optical engine of claim 5, wherein the optical engine further comprises: A concave mirror, arranged at the end of the tapered rod with the largest cross-section, the concave mirror can bend and gather the light guided by the tapered rod toward a predetermined direction; A condensing lens for receiving light from the concave mirror and concentrating it; A prism group accepts light from the condenser lens and bends it; a dynamic display device that receives light from the prism set and reflects it back to the prism set; and A projection lens group accepts light from the prism group and reflected by the dynamic display device, and focuses it for imaging on an external projection surface. 12. The optical engine of claim 11, wherein the prism set is a reverse total internal reflection prism set comprising: The first prism adjacent to the condenser lens and the second prism adjacent to the dynamic display device, the first prism is a wedge-shaped prism, and its cross-section along the direction of light travel is a cone shape, and the cross-section of the second prism along the direction of light travel The first prism is in the form of a right triangle, and the first prism is attached to a surface where a long side of the cross-section of the second prism belongs to, and the dynamic display device and the projection lens group are respectively adjacent to the two sides of the cross-section of the second prism. The two surfaces to which the vertical edge belongs. 13. The optical engine of claim 11, wherein the optical engine further comprises: A base, with a right cover and a lower cover on the base, a first space is formed on the right cover for accommodating the dynamic display device, and a V-shaped lower recess is formed on the lower cover , a prism lower shield adjacent to the right cover, and a lower groove between the V-shaped lower recess and the prism lower shield; and An upper cover, combined with the lower cover of the base, the upper cover has a V-shaped upper recess, a prism upper cover and an upper groove whose shape and position respectively correspond to the V-shaped lower recess , The prism lower cover and the lower groove, when the upper cover is covered with the lower cover, an accommodating space can be formed between the upper and lower covers; Wherein, the prism group is accommodated between the prism upper shield and the prism lower shield, the condenser lens is accommodated between the upper groove and the lower groove, and the concave mirror is accommodated between the V-shaped upper recess and the V-shaped The turning position of the V-shaped lower concave seat, and one end of the V-shaped upper concave seat and the V-shaped lower concave seat accommodate the tapered rod and the fixing seat. 14. The optical engine as claimed in claim 13, wherein the dynamic display device further comprises: a DMD chip; a DMD socket for inserting the DMD chip; a DMD circuit board combined with the DMD socket; and a The DMD power connection socket is combined with the DMD circuit board. 15. The optical engine as claimed in claim 13, wherein the projection lens group is located on one side of the prism upper shield and the prism lower shield, and comprises a rubber sleeve and a buckle, and the rubber sleeve can be placed on the lens The outside of the lens group, and the outer contour of the rubber cover just fills the space between the prism upper shield and the prism lower shield to avoid light interference. The buckle can lock the lens group to an extension frame on the right cover . 16. An optical engine comprising: a light source module, used to generate a light traveling toward a predetermined direction; a condenser lens to concentrate the light; and A reverse total internal reflection (RTIR) prism group accepts light from the condenser lens and deflects it; Among them, the prism group includes: The first prism closer to the condenser lens and the second prism farther away from the condenser lens, the first prism is a wedge-shaped prism, and its cross-section along the direction of light travel is a cone shape, and the second prism is along the direction of light travel The cross-section above is a right triangle, and the first prism is attached to a surface to which a long side of the cross-section right triangle of the second prism belongs; Wherein, by rotating the relative positions of the first prism and the second prism, the angle and direction of light bending are controlled and fine-tuned. 17. The optical engine of claim 16, wherein the light source module comprises: a light source for emitting light toward a predetermined optical axis; A tapered rod, one end of which is adjacent to the light source, the tapered rod has several long and narrow surfaces extending along the optical axis, so that the cross-section of the tapered rod perpendicular to the optical axis presents a polygonal profile, and each long and narrow surface is respectively It has two relatively long sides extending generally along the direction of the optical axis, and two relatively short sides substantially perpendicular to the optical axis, and the length of the short side of each elongated surface closer to the light source is smaller than the length of the other short side farther away from the light source length, so that the cross-section of the tapered rod substantially increases away from the light source; and, The light reflection device is implemented on each elongated surface of the tapered rod, so that the light emitted by the light source can be reflected by each elongated surface and guided along the direction of the optical axis. 18. The optical engine according to claim 17, wherein the light source, the tapered rod and the light reflection device constitute a light source module, and the light source module comprises: a light emitting diode for emitting light; a circuit board for carrying the light emitting diode; a fixing seat, combined with the circuit board, the fixing seat has a hollow groove, which can be inserted into one end of the tapered rod, and the position of the light emitting diode just corresponds to the end of the tapered rod; and, An elastic clip clamps and locates the tapered rod on the fixing seat; Wherein, the fixing base has a bipod and a chute between the bipods, the size of the chute corresponds to the size of the circuit board, so that the circuit board can slide into the chute and combine with the fixing base; Wherein, the optical engine further includes a heat dissipation component, the heat dissipation component has a heat dissipation contact surface and several heat dissipation fins extending from the heat dissipation contact surface, and a convex surface of a predetermined shape is further provided on the heat dissipation contact surface, Wherein, the fixing seat and the circuit board are combined on the heat dissipation contact surface, and the position of the raised surface is just located in a gap formed between the two legs, so that the circuit board carries the light emitting diode at the position , can directly contact the raised surface; Wherein, the elastic clip has: several jaws, at least one fastener is located on one of the jaws, and a set of holes between the jaws, the size of the holes is greater than the size of the largest section of the tapered rod , by putting the sleeve hole of the elastic clip on the tapered rod, and making at least one clamping claw buckle the fixed seat, the tapered rod can be combined and positioned on the fixed seat. 19. The optical engine of claim 17, wherein the optical engine further comprises: A concave mirror is arranged at the position of the end of the tapered rod with the largest cross-section, and the concave mirror can bend and gather the light guided by the tapered rod toward the direction of the condenser lens; a dynamic display device (DMD) receiving light from the prism set and reflecting it back to the prism set; and A projection lens group, which receives light from the prism group and is reflected by the dynamic display device, and focuses it for imaging on an external projection surface; Wherein, the dynamic display device and the projection lens group are respectively adjacent to the two surfaces of the second prism to which the two vertical sides of the right triangle in section belong. 20. The optical engine of claim 19, wherein the optical engine further comprises: A base, on which there is also a right cover and a lower cover, a first space is formed on the right cover for accommodating the dynamic display device, and a V-shaped concave is formed on the lower cover seat, a prism lower shield adjacent to the right cover, and a lower groove located between the V-shaped lower recess and the prism lower shield; and An upper cover, which can be combined on the lower cover of the base, the upper cover also includes: a V-shaped upper recess; a prism upper shield and an upper concave groove, the shape and position of which are respectively corresponding to The V-shaped lower recess, the prism lower shield and the lower groove can form an accommodating space between the upper and lower covers when the upper cover is closed on the lower cover; Wherein, the prism group is accommodated between the prism upper shield and the prism lower shield, the condenser lens is accommodated between the upper groove and the lower groove, and the concave mirror is accommodated between the V-shaped upper recess and the V-shaped The turning position of the V-shaped lower concave seat, and one end of the V-shaped upper concave seat and the V-shaped lower concave seat accommodates the tapered rod and the fixing seat; Wherein, the dynamic display device includes: a DMD chip; a DMD socket for inserting the DMD chip; a DMD circuit board, combined with the DMD socket, and a DMD power connection socket, combined with the DMD circuit board. 21. An optical engine comprising: a light source emitting light toward a predetermined optical axis; A tapered rod, one end of which is adjacent to the light source and extends along the direction of the optical axis, and the cross-section of the tapered rod perpendicular to the direction of the optical axis becomes larger substantially along the direction away from the light source, and the light emitted by the light source The light can be guided by the tapered rod to advance along the optical axis; At least one light concentrating component is used for receiving and concentrating the light from the tapered rod; A prism group accepts and deflects the light from the light-collecting component; a dynamic display device (DMD) receiving light from the prism set and reflecting it back to the prism set; and A projection lens group accepts light from the prism group and reflected by the dynamic display device, and focuses it for imaging on an external projection surface. 22. The optical engine of claim 21, wherein at least one light focusing assembly comprises: a concave mirror, arranged at the end of the tapered rod with the largest cross-section, the concave mirror can bend and gather the light guided by the tapered rod toward a predetermined direction; and A condensing lens for receiving light from the concave mirror and concentrating it; Wherein, the prism group is a reverse total internal reflection (RTIR) prism group, which includes: A first prism adjacent to the condenser lens and a second prism adjacent to the dynamic display device, the first prism is a wedge-shaped prism whose cross-section along the direction of light travel is a cone shape, and the second prism is along the direction of light travel The section of the first prism is a right triangle, and the first prism is attached to a surface where a long side of the second prism's section right triangle belongs, and the dynamic display device and the projection lens group are respectively adjacent to the second prism's section of the right triangle. The two surfaces to which the two perpendicular edges belong. 23. A projection device, comprising: an optical engine for generating optical images; a circuit board module connected to the optical engine for controlling the operation of the optical engine; A heat dissipation module is used for heat dissipation of the optical engine and the circuit board module; an operation interface module connected to the circuit board module to operate the projection device; and, An outer casing, which accommodates the aforementioned optical engine, circuit board module, heat dissipation module and operation interface module; Among them, the optical engine includes: a light source for emitting light toward a predetermined optical axis; A tapered rod, one end of which is adjacent to the light source, the tapered rod has several long and narrow surfaces extending along the optical axis, so that the cross-section of the tapered rod perpendicular to the optical axis presents a polygonal profile, and each long and narrow surface has Two relatively long sides extending generally along the optical axis direction, and two relatively short sides substantially perpendicular to the optical axis, and the length of the short side of each elongated surface closer to the light source is smaller than the length of the other short side farther away from the light source length, so that the cross-section of the tapered rod becomes substantially larger away from the light source; and, The light reflection device is implemented on each elongated surface of the tapered rod, so that the light emitted by the light source can be reflected by each elongated surface and guided along the direction of the optical axis. 24. A projection device, comprising: an optical engine for generating optical images; a circuit board module connected to the optical engine to control the operation of the optical engine; A heat dissipation module is used for heat dissipation of the optical engine and the circuit board module; an operation interface module connected to the circuit board module for operating the projection device; and, An outer casing for accommodating the aforementioned optical engine, circuit board module, heat dissipation module and operation interface module; Among them, the optical engine includes: a light source module, used to generate a light traveling toward a predetermined direction; a condenser lens to concentrate the light; and A reverse total internal reflection (RTIR) prism group accepts light from the condenser lens and deflects it; Among them, the prism group includes: The first prism closer to the condenser lens and the second prism farther away from the condenser lens, the first prism is a wedge-shaped prism whose cross-section along the light traveling direction is a cone shape, and the second prism is along the light traveling direction The cross section of the second prism is a right triangle, and the first prism is attached to a surface to which a long side of the right triangle cross section of the second prism belongs; Wherein, by rotating the relative positions of the first prism and the second prism, the angle and direction of light bending can be controlled and fine-tuned. 25. A projection device, comprising: an optical engine for generating optical images; a circuit board module connected to the optical engine to control the operation of the optical engine; A heat dissipation module is used for heat dissipation of the optical engine and the circuit board module; an operation interface module connected to the circuit board module to operate the projection device; and, An outer casing for accommodating the aforementioned optical engine, circuit board module, heat dissipation module and operation interface module; Among them, the optical engine includes: a light source for emitting light toward a predetermined optical axis; A tapered rod, one end of which is adjacent to the light source and extends along the direction of the optical axis, and the cross-section of the tapered rod perpendicular to the direction of the optical axis becomes larger substantially along the direction away from the light source, and the light emitted by the light source The light can be guided by the tapered rod to advance along the optical axis; At least one light concentrating component is used for receiving and concentrating the light from the tapered rod; A prism group accepts and deflects the light from the light-collecting component; a dynamic display device (DMD) receiving light from the prism set and reflecting it back to the prism set; and A projection lens group accepts light from the prism group and reflected by the dynamic display device, and focuses it for imaging on an external projection surface.

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