CN101311815A - light homogenizing element - Google Patents

Abstract

A light homogenizing element is suitable for use in a multi-lamp lighting system. The light homogenizing element includes a hollow cylinder and a plurality of solid cylinders. The hollow column body is provided with a first light inlet end and a first light outlet end which are opposite. Each solid column body is provided with a second light inlet end and a second light outlet end which are opposite, and the second light outlet end is positioned in the first light inlet end of the hollow column body. The light homogenizing element has high light output efficiency and can improve the imaging quality of the projection device.

Description

light homogenizing element

technical field

The invention relates to a projection device, in particular to a light homogenizing element of the projection device.

Background technique

Referring to FIG. 1 , a conventional projection device 100 includes a light source 110 , a light integration rod 120 , a plurality of lenses 130 , a light valve 140 and a projection lens 150 . The light source 110 is used for providing an illumination beam 112 , the light integrating rod 120 is used for uniformizing the illumination beam 112 , and the lens 130 is used for converging the illumination beam 112 on the light valve 140 . The light valve 140 can convert the illumination beam 112 into an image beam 112', and the projection lens 150 is used to project the image beam 112' onto a screen (not shown) to form an image on the screen.

Generally speaking, the light integrating cylinder 120 can be the hollow cylinder 200 shown in FIG. 2A or the solid cylinder 200' shown in FIG. 2B. The hollow cylinder 200 is composed of four reflectors 210 , and the inner surface 212 of each reflector 210 is provided with a reflective coating (not shown), so that the illumination beam 112 is reflected in the hollow cylinder 200 . Since the reflectivity of the reflective coating to visible light is below 99%, the longer the hollow cylinder 200 is, the worse the light output efficiency will be. Taking a hollow cylinder 200 with a light incident cross section of 9mm×6.75mm as an example, when the length of the hollow cylinder 200 is 25mm, the light output efficiency is only 91.5%, and when the length of the hollow cylinder 200 is 54mm , its light output efficiency is only 75.6%. In addition, if the length of the hollow cylinder 200 is too short, the light uniformity will be reduced, so the light uniformity and light output efficiency often cannot achieve an optimal balance.

In addition, in the prior art, the four reflectors 210 are fixed by colloid, but since the energy of the illuminating light beam 112 is very strong, it is easy to cause the temperature of the hollow cylinder 200 (especially the light incident end of the hollow cylinder 200) to be too high, so Colloids tend to be easily deteriorated by high temperature, causing the risk of collapse of the hollow cylinder 200 . Therefore, the reliability of the hollow cylinder 200 is poor.

Compared with the hollow cylinder 200, since the solid cylinder 200' utilizes the principle of total reflection to reflect the illumination beam 112 inside, it has higher light output efficiency. However, since the light output end 202 of the solid cylinder 200' will be directly imaged on the light valve 140, if the light output end 202 has defects such as dust, holes (dig), scratches, particles, etc., it will are enlarged and projected onto a screen, severely degrading the image quality.

Contents of the invention

The invention provides a light homogenizing element to improve light output efficiency and image quality of a projection device.

The invention provides a dual-lamp system to improve light output efficiency and image quality of a projection device.

An embodiment of the present invention provides a light homogenizing element, which is suitable for a multi-lamp lighting system. The light homogenizing element includes a hollow cylinder and multiple solid cylinders. The hollow cylinder has a first light incident end and a first light exit end opposite to each other. Each solid cylinder has a second light incident end and a second light exit end opposite to each other, and the second light exit end is located in the first light entrance end of the hollow cylinder.

Embodiments of the present invention further provide a light homogenizing element, which is suitable for a dual-lamp lighting system. The light homogenizing element includes a hollow cylinder and a solid cylinder. The hollow cylinder has a first light incident end and a first light exit end opposite to each other, the solid cylinder has a second light entrance end and a second light exit end opposite to each other, and the second light exit end is located at the first light exit end of the hollow cylinder. into the light end. The second light-incident end area is divided into two parts, and the two light beams provided by the two light sources of the double-lamp lighting system respectively enter the solid cylinder from a part of the second light-incident end.

Embodiments of the present invention further provide a dual-lamp lighting system, which includes two lamp sources, a light homogenizing element, and a light guiding element. The light source is adapted to provide a light beam respectively, and the light guide element is disposed between the light source and the light homogenizing element. The light homogenizing element includes a hollow cylinder and two solid cylinders. The hollow cylinder has a first light incident end and a first light exit end opposite to each other. Each solid cylinder has a second light incident end and a second light exit end opposite to each other, and the second light exit end is located in the first light entrance end of the hollow cylinder. The light guide element is arranged between the light source and the second light incident end of the light homogenizing element, so that the light beams respectively enter one of the solid cylinders.

The light homogenizing element of the present invention mainly uses the solid cylinder to homogenize the light beam, so the light output efficiency can be improved. In addition, connecting the solid cylinder and the hollow cylinder can prevent the surface defects of the second light-emitting end of the solid cylinder from being enlarged and projected onto the screen, thereby improving the image quality of the projection device.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, preferred embodiments are exemplified below and described in detail with reference to the accompanying drawings.

Description of drawings

Fig. 1 is a schematic diagram of an existing projection device;

Fig. 2A is a perspective view of an existing hollow cylinder;

Fig. 2B is a perspective view of an existing solid cylinder;

3 is a schematic cross-sectional view of a light homogenizing element according to the first embodiment of the present invention;

Fig. 4 is a relationship diagram between the reflectivity of the coating of the light homogenizing element and the wavelength of visible light;

5A is a schematic diagram of adjusting the arrangement angle of the hollow cylinder of the light homogenizing element;

Fig. 5B is a schematic diagram of a hollow cylinder of a moving light homogenizing element;

6 is a schematic cross-sectional view of another light homogenizing element according to the first embodiment of the present invention;

7 is a schematic cross-sectional view of a light homogenizing element according to a second embodiment of the present invention;

8 is a perspective view of a light homogenizing element according to a third embodiment of the present invention;

9 is a perspective view of a light homogenizing element according to a fourth embodiment of the present invention;

10 is a schematic cross-sectional view of a light homogenizing element according to a fifth embodiment of the present invention;

Fig. 11 is a schematic cross-sectional view of another light homogenizing element according to the fifth embodiment of the present invention;

Fig. 12 is a schematic cross-sectional view of a light homogenizing element according to the sixth embodiment of the present invention;

FIG. 13 is a schematic cross-sectional view of another light homogenizing element according to the sixth embodiment of the present invention.

[Description of main component symbols]

40a, 40b, 110: light sources

50a, 50b: light beam

60, 60a: light guide element

62: Translucent part

64: Reflection Department

100: projection device

112: Lighting Beam

112': image beam

120: light integrating column

130: lens

140: light valve

150: projection lens

200, 310, 410: hollow cylinder

200’, 320, 320b, 320c, 420, 420a, 420b, 420c: solid cylinder

202: light output end

210: reflector

212, 316: inner surface

300, 300a, 300b, 300c, 400, 400b: light homogenizing elements

312, 412: the first light incident port

312a: engaging notch

314, 414: the first light outlet

318: Plating

322, 422, 422b: the second light incident end

324, 424: the second light output port

423, 425, 427: light reflecting surface

426: Light incident surface

428: Side

500, 500a: double lamp lighting system

Detailed ways

The following descriptions of various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be practiced. The direction terms mentioned in the present invention, such as "up", "down", "front", "rear", "left", "right", etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate, not to limit, the invention.

[first embodiment]

Referring to FIG. 3 , the dual-lamp lighting system 500 is suitable for a projection device. In this embodiment, the dual lamp lighting system 500 includes two lamp sources 40 a, 40 b and a light homogenizing element 300 . The light homogenizing element 300 includes a hollow cylinder 310 and two solid cylinders 320 . The hollow cylinder 310 has a first light incident end 312 and a first light exit end 314 opposite to each other. Each solid cylinder 320 has a second light incident end 322 and a second light exit end 324 opposite to each other, and the second light exit end 324 is located in the first light incident end 312 of the hollow cylinder 310 .

Each solid cylinder 320 can be a cylinder or a polygonal cylinder, and the polygonal cylinder can be a rectangular cylinder or a triangular cylinder. In addition, the length of the hollow cylinder 310 is, for example, smaller than the length of each solid cylinder 320 . In addition, the double-lamp lighting system 500 also includes a light guide element 60, and two solid cylinders 320 are arranged between the light guide element 60 and the hollow cylinder 310, so that the light sources 40a, 40b of the double-lamp lighting system 500 provide The light beams 50a, 50b are respectively incident on a solid cylinder 320 . In more detail, the light guide element 60 has a light-transmitting portion 62 and a reflecting portion 64. The light beam 50a can pass through the light-transmitting portion 62 and enter the solid cylinder 320 at the top of FIG. Reflected and incident on the solid cylinder 320 at the bottom of FIG. 3 .

Based on the above, after the light beams 50 a and 50 b enter the solid cylinder 320 , they will be totally reflected and homogenized in the solid cylinder 320 . Since the total reflection of the light beams 50a, 50b will not lose energy, the length of the solid cylinder 320 is designed to be greater than the length of the hollow cylinder 310 in this embodiment, so that the solid cylinder 320 can be used as the main light homogenizing component of the light homogenizing element 300 . Since the length of the hollow cylinder 320 is relatively short, the number of reflections of the light beams 50a and 50b inside the hollow cylinder 320 can be reduced to reduce the loss of light energy. Therefore, compared with the hollow cylinder used in the prior art, the light homogenizing element 300 of this embodiment can improve the light output efficiency of the dual-lamp lighting system 500 .

In addition, since the first light-emitting end 314 of the hollow cylinder 310 is used as the light-emitting end of the light homogenizing element 310 in this embodiment, dust, holes, scratches, particles, etc. on the second light-emitting end 324 of the solid cylinder 320 can be avoided. The defect is imaged on the light valve of the projection device. Therefore, compared with the solid cylinder used in the prior art, the light homogenizing element 300 of this embodiment can improve the imaging quality of the projection device.

In addition, compared with the hollow cylinder used in the prior art, this embodiment uses the second light incident end 322 of the solid cylinder 320 as the light incident end of the light homogenizing element 310, so the hollow cylinder of the prior art can be avoided. The colloid at the light incident end of the body is easy to deteriorate due to excessive temperature, resulting in the situation that the hollow cylinder is easy to collapse. Therefore, the light homogenizing element 300 of this embodiment has high reliability.

Furthermore, in this embodiment, the second light-emitting end 324 of the solid cylinder 320 is inserted into the first light-incoming end 312 of the hollow cylinder 310 to prevent the light beams 50a, 50b from being at the intersection of the solid cylinder 320 and the hollow cylinder 310 loss, thereby improving the light output efficiency of the light homogenizing element 300 .

In this embodiment and/or other embodiments of the present invention, the inner surface 316 of the hollow cylinder 310 may be provided with a coating 318 to reflect the light beams 50a, 50b. The reflectivity of the coating layer 318 to visible light of different wavelengths can be different (as shown in FIG. 4 ), so that the color temperature of the light beam output by the light uniformizing element 300 can be adjusted.

In addition, in this embodiment, the hollow cylinder 310 can be used to fine-tune the position of the light beam output by the light homogenizing element 300 projected on the light valve. More specifically, in this embodiment, the light beam can be precisely converged by adjusting the angle of the hollow cylinder 310 (as shown in FIG. 5A ) or by moving the hollow cylinder 310 (as shown in FIG. 5B ). On the light valve to improve the light utilization efficiency and image quality of the projection device. Since the solid cylinder 320 will not move when the hollow cylinder 310 is adjusted, the position where the light beams 50a, 50b are incident on the light homogenizing element 300 will not be affected.

In addition, referring to FIG. 6 , an engaging notch 312 a can be provided adjacent to the first light-incident end 312 of the hollow cylinder 310 , so that the solid cylinder 310 can be engaged in the first light-incident end 312 .

[Second embodiment]

Referring to FIG. 7 , the light homogenizing element 300 a differs from the light homogenizing element 300 in that the lengths of the solid cylinders 320 of the light homogenizing element 300 a are different. The second light emitting ends 324 of the solid cylinders 320 of the light homogenizing element 300 a are located on the same plane, while the second light incident ends 322 of the solid cylinders 320 are located on different planes. In addition, the light guide element 60a of the dual lamp lighting system 500a is a reflective element. Among the plurality of solid cylinders 320 , the shorter solid cylinder 320 is disposed between the light guide element 60 a and the hollow cylinder 310 to reflect the light beam 50 b to the shorter solid cylinder 320 . The light beam 50a is directly incident on the longer solid cylinder 320 .

[Third embodiment]

Referring to FIG. 8 , the difference between the light homogenizing element 300b and the light homogenizing element 300 is that each solid cylinder 320b of the light homogenizing element 300b is a triangular cylinder, and two solid cylinders 320b form a rectangular cylinder.

Although the number of solid cylinders of the light homogenizing element in the first embodiment to the third embodiment is two, the present invention does not limit the number of solid cylinders. The solid cylinder of the light homogenizing element of the present invention can be adjusted according to the number of light sources of the lighting system. Hereinafter, an embodiment will be used to illustrate the light homogenizing element having more than two solid columns.

[Fourth embodiment]

Referring to FIG. 9 , the difference between the light homogenizing element 300c and the light homogenizing element 300 is that the light homogenizing element 300c includes four solid cylinders 320c, and the solid cylinders 320c are cylinders. The light homogenizing element 300c is suitable for a lighting system with four light sources. Since the spot of the light beam projected on the solid cylinder 320c is circular, using a cylinder as the solid cylinder 320c allows most of the light beam to enter the solid cylinder 320c, thereby avoiding light loss. In addition, although a cylinder is used as the solid cylinder 320c in FIG. 9 , the solid cylinder 320c may also be replaced with a polygonal cylinder in this embodiment.

[Fifth Embodiment]

Referring to FIG. 10, the light homogenizing element 400 is suitable for use in a dual lamp lighting system. The light homogenizing element 400 includes a hollow cylinder 410 and a solid cylinder 420 . The hollow cylinder 410 has a first light incident end 412 and a first light exit end 414 opposite to each other. The solid cylinder 420 has a second light incident end 422 and a second light exit end 424 opposite to each other, and the second light exit end 424 is located in the first light incident end 412 of the hollow cylinder 410 . The second light incident end 422 is divided into two parts, and the two light beams 50a and 50b provided by the two light sources of the dual-lamp lighting system respectively enter the solid cylinder 420 from the corresponding part of the second light incident end 422 . Specifically, the second light incident end 422 has a light reflective surface 423 and a light incident surface 426 adjacent to each other, and the light reflective surface 423 is inclined relative to the second light exit end 424, while the light incident surface 426 is substantially parallel to The second light output end 424 .

Based on the above, the length of the solid cylinder 420 is, for example, greater than the length of the hollow cylinder 410 . In addition, the light beam 50 a provided by a light source of the double-lamp lighting system can enter the solid cylinder 420 from the light incident surface 426 to be uniform in the solid cylinder 420 . The light beam 50b provided by another light source of the double-lamp lighting system enters the solid cylinder 420 from one side 428 of the solid cylinder 420, and will be reflected by the light reflecting surface 423 and transmitted toward the second light output end 424, and then The solid cylinder 420 is homogenized.

The advantages of the light homogenizing element 400 of this embodiment are similar to those of the light homogenizing element 300 of the first embodiment, and will not be repeated here. In addition, similar to that described in the first embodiment, in this embodiment, an engaging notch 312a as shown in FIG. Inside the optical end 412. In addition, in this embodiment, a solid cylinder 420a (as shown in FIG. 11 ) gradually expanding from the second light-emitting end 424 to the second light-incoming end 422 can also be used to facilitate the connection between the solid cylinder 420a and the hollow cylinder 410. Snap.

[Sixth embodiment]

12, the light homogenizing element 400b is similar to the light homogenizing element 400 in FIG. There is an included angle between 425 and 427. After the light beam 50a provided by a light source of the double-lamp lighting system enters the solid cylinder 420b from one side 429 of the solid cylinder 420b, it will be reflected by the light reflecting surface 425 and transmitted toward the second light output end 424, and then in the solid cylinder 420b. The homogenization process takes place in column 420b. The light beam 50b provided by another light source of the double-lamp lighting system enters the solid cylinder 420b from one side 428 of the solid cylinder 420b, and will be reflected by the light reflecting surface 427 and transmitted toward the second light output end 424, and then The homogenization process takes place in the solid cylinder 420b.

The advantages of the light homogenizing element 400b in this embodiment are similar to those of the light homogenizing element 300 in the first embodiment, and will not be repeated here. In addition, similar to that described in the first embodiment, in this embodiment, an engaging notch 312a as shown in FIG. Inside the optical end 412. In addition, in this embodiment, a solid cylinder 420c gradually expanding from the second light-emitting end 424 to the second light-incoming end 422 (as shown in FIG. 13 ) can also be used to facilitate the connection between the solid cylinder 420c and the hollow cylinder 410. Snap.

In summary, the embodiments of the present invention have at least one or some or all of the following advantages:

1. The present invention uses a solid cylinder as the main light homogenizing component of the light homogenizing element, which can reduce the number of reflections of light beams in the hollow cylinder to reduce the loss of light energy. Therefore, compared with the hollow cylinder in the prior art, the double-lamp lighting system of the present invention has higher light output efficiency.

2. Using the first light-emitting end of the hollow cylinder as the light-emitting end of the light homogenizing element can prevent the defects of the second light-emitting end of the solid cylinder from being imaged on the light valve of the projection device. Therefore, compared with the solid cylinder in the prior art, the light homogenizing element of this embodiment can improve the imaging quality of the projection device.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The protection scope of the invention shall be defined by the appended claims. In addition, any embodiment or claim of the present invention does not need to achieve all the objects or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist in the search of patent documents, and are not used to limit the scope of rights of the present invention.

Claims (23)

1, a kind of light uniformization element is applicable to that in the multiple lamp illumination system, this light uniformization element comprises:

One hollow cylinder has one first relative light inputting end and one first bright dipping end; And

A plurality of solid cylinders, each solid cylinder have one second relative light inputting end and one second bright dipping end, and those second bright dipping ends are positioned at this first light inputting end of this hollow cylinder.

2, light uniformization element as claimed in claim 1, wherein each solid cylinder is a right cylinder or a polygon cylinder.

3, light uniformization element as claimed in claim 1, wherein those solid cylinders comprise two triangulo columns, and those triangulo columns are formed a rectangular cylinder.

4, light uniformization element as claimed in claim 1, wherein the inside surface of this hollow cylinder is provided with a coating, and this coating is to the reflectivity difference of the visible light of different wave length.

5, light uniformization element as claimed in claim 1, wherein contiguous this first light inputting end is provided with an engaging breach, is sticked in this first light inputting end in order to those solid cylinders.

6, light uniformization element as claimed in claim 1, wherein the length of this hollow cylinder is less than the length of each solid cylinder.

7, light uniformization element as claimed in claim 1, wherein those second light inputting ends are positioned at Different Plane.

8, a kind of light uniformization element is applicable to that in the double-lamp illuminating system, this light uniformization element comprises:

One hollow cylinder has one first relative light inputting end and one first bright dipping end; And

One solid cylinder, have one second relative light inputting end and one second bright dipping end, and this second bright dipping end is positioned at this first light inputting end of this hollow cylinder, wherein this second light inputting end is divided into two parts, and two light beams that two lamp sources of this double-lamp illuminating system are provided are respectively from wherein a part of this solid cylinder of incident of the correspondence of this second light inputting end.

9, light uniformization element as claimed in claim 8, wherein this second light inputting end has an adjacent light reflection surface and a light entrance face, and this light reflection surface tilts with respect to this second bright dipping end, and this light entrance face is parallel to this second bright dipping end in fact.

10, light uniformization element as claimed in claim 8, wherein this second light inputting end has two light reflection surfaces, and between those light reflection surfaces an angle is arranged.

11, light uniformization element as claimed in claim 8, wherein the inside surface of this hollow cylinder is provided with a coating, and this coating is to the reflectivity difference of the visible light of different wave length.

12, light uniformization element as claimed in claim 8, wherein contiguous this first light inputting end is provided with an engaging breach, is sticked in this first light inputting end in order to this solid cylinder.

13, light uniformization element as claimed in claim 8, wherein this solid cylinder is to be expanded to this second light inputting end gradually from this second bright dipping end.

14, light uniformization element as claimed in claim 8, wherein the length of this hollow cylinder is less than the length of this solid cylinder.

15, a kind of double-lamp illuminating system comprises:

Two lamp sources are suitable for providing respectively a light beam;

One light uniformization element comprises

One hollow cylinder has one first relative light inputting end and one first bright dipping end; And

Two solid cylinders, each solid cylinder have one second relative light inputting end and one second bright dipping end, and those second bright dipping ends are positioned at this first light inputting end of this hollow cylinder;

One light-guide device is disposed between those second light inputting ends of those lamp sources and this light uniformization element so that those light beams respectively those solid cylinders of incident one of them.

16, multiple lamp illumination system as claimed in claim 15, wherein each solid cylinder is a right cylinder or a polygon cylinder.

17, multiple lamp illumination system as claimed in claim 15, wherein those solid cylinders are respectively a triangulo column, and those triangulo columns are formed a rectangular cylinder.

18, multiple lamp illumination system as claimed in claim 15, wherein the inside surface of this hollow cylinder is provided with a coating, and this coating is to the reflectivity difference of the visible light of different wave length.

19, multiple lamp illumination system as claimed in claim 15, wherein contiguous this first light inputting end is provided with an engaging breach, is sticked in this first light inputting end in order to those solid cylinders.

20, multiple lamp illumination system as claimed in claim 15, wherein the length of this hollow cylinder is less than the length of each solid cylinder.

21, light uniformization element as claimed in claim 15, wherein this light-guide device has a transmittance section and a reflecting part, this light beam that one of them provided in those lamp sources is passed to one of them of those solid cylinders by this transmittance section, this light beam that wherein another provided in those lamp sources by this reflecting part reflex to those solid cylinders wherein another.

22, light uniformization element as claimed in claim 15, wherein those second light inputting ends are positioned at Different Plane.

23, light uniformization element as claimed in claim 22, wherein this light-guide device is a reflecting element, is disposed at one of them the place ahead of those second light inputting ends.

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