CN102445764A - Three-color light synthesis device - Google Patents

Abstract

The invention relates to a three-color light synthesis device, which comprises a light splitting film, a polarization converter and a bypass filter film. The polarization converter is adjacent to the light splitting film. An included angle of 45 degrees is formed between the polarization converter and the light splitting film. The bypass filter can be coated on the polarization converter. The polarization converter is arranged between the light splitting film and the bypass filter film.

Description

Three-color light synthesis device

technical field

The invention relates to a three-color light synthesis device, in particular to a light-weight three-color light synthesis device.

Background technique

Generally speaking, current projectors usually use a three-color light synthesis device to achieve the purpose of three-color light synthesis output.

For example, please refer to FIG. 1 , a conventional three-color light synthesis device 1 mainly includes a reflector 10 , a first dichroic prism 21 and a second dichroic prism 22 .

The reflecting mirror 10 , the first dichroic prism 21 and the second dichroic prism 22 are sequentially adjacent to each other. The first dichroic prism 21 and the second dichroic prism 22 respectively have a first dichroic film 21a and a second dichroic film 22a. Here, the first dichroic film 21 a and the second dichroic film 22 a may be in the form of dichroic dichroic films.

As shown in Figure 1, when the first light beam L1, the second light beam L2 and the third light beam L3 are to be combined (here, the first light beam L1, the second light beam L2 and the third light beam L3 have different wavelengths respectively) The first light beam L1 , the second light beam L2 and the third light beam L3 respectively strike the mirror 10 , the first dichroic prism 21 and the second dichroic prism 22 of the three-color light combining device 1 in a parallel manner. At this time, the first light beam L1 will be reflected by the mirror 10 and pass through the first dichroic prism 21 and the second dichroic prism 22 to be output from the output end 30 of the three-color light synthesis device 1, and the second light beam L2 will pass through the first dichroic prism The first dichroic film 21a of 21 reflects and passes through the second dichroic prism 22 to be output from the output end 30 of the three-color light synthesis device 1, and the third light beam L3 will be reflected by the second dichroic film 22b of the second dichroic prism 22 from The output terminal 30 of the three-color light synthesis device 1 outputs. As mentioned above, the first light beam L1 , the second light beam L2 and the third light beam L3 may be combined after being output from the output terminal 30 .

However, the existing three-color light synthesis device 1 has some disadvantages. More specifically, since the components of the three-color light synthesis device 1 include a reflector and two dichroic prisms, its overall volume will be relatively large. Therefore, the three-color light synthesis device 1 is very unfavorable for application in micro projectors.

Contents of the invention

The technical problem to be solved by the present invention is to provide a light-weight three-color light synthesis device for the defect of large volume of the three-color light synthesis device in the prior art.

The technical solution adopted by the present invention to solve the technical problem is to provide a three-color light synthesis device, which is suitable for micro-projectors and includes a light-splitting film; a polarization converter is adjacent to the light-splitting film to rotate polarized light The polarization direction, wherein, there is an included angle of 45 degrees between the polarization converter and the beam splitting film; and the bypass filter film can be plated on the polarization converter, wherein the polarization converter is arranged on Between the spectroscopic film and the bypass filter film.

Meanwhile, the three-color light synthesis device according to the present invention further includes a dichroic prism adjacent to the polarization converter, wherein the dichroic film is formed in the dichroic prism.

In the present invention, a transparent plate is further included adjacent to the polarization converter, wherein the light splitting film can be coated on the transparent plate.

In the present invention, the light splitting film combines the properties of the dichroic light splitting film and the polarized light splitting film to reflect the S polarized light of a light beam and allow the P polarized light to pass through. At the same time, the light splitting film can be used to reflect another light beam and allow another light beam to pass through.

In the present invention, the polarization converter may be a 1/4 wavelength plate.

The three-color light synthesis device implementing the present invention has the following beneficial effects: the use of at least one dichroic prism can be omitted, so its overall volume can be effectively reduced. Therefore, the three-color light synthesis device disclosed in the present invention can be easily applied in a micro projector. In addition, since the assembly of the three-color light synthesis device disclosed in the present invention is simple, assembly errors can be greatly reduced, and additional manufacturing costs are not required. In addition, since the three-color light synthesis device disclosed in the present invention has fewer components, its manufacturing cost can be reduced.

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

Description of drawings

Figure 1 shows a schematic plan view of an existing three-color light synthesis device;

Figure 2 shows a schematic plan view of the three-color light synthesis device of the first embodiment of the present invention;

3 shows a schematic plan view of a three-color light synthesis device according to a second embodiment of the present invention; and

FIG. 4 shows a schematic plan view of a three-color light synthesis device according to a third embodiment of the present invention.

Detailed ways

A preferred embodiment of the present invention will now be described in conjunction with the accompanying drawings.

first embodiment

Referring to FIG. 2 , the three-color light synthesis device 100 of this embodiment mainly includes a dichroic prism 110 , a polarization converter 120 and a bypass filter film 130 .

The dichroic prism 110 has a dichroic film 111 . That is, the dichroic film 111 is coated in the dichroic prism 110 . In this embodiment, the light-splitting film 111 is a special coating formed by combining the properties of the dichroic light-splitting film and the polarized light-splitting film. In addition, it is worth mentioning that the general light can be further subdivided into two vertically vibrating beams, that is, S polarized light (the vibration direction is perpendicular to the reflection plane) and P polarized light (the vibration direction is parallel to the reflection plane) . Therefore, the dichroic film 111 of this embodiment has the characteristics of reflecting the S polarized light of the second light beam L2 and allowing the P polarized light thereof to pass through. At the same time, the dichroic film 111 can reflect the third light beam L3 and allow the first light beam L1 to pass through. .

The polarization converter 120 is adjacent to the dichroic prism 110 or the dichroic film 111 and is mainly used to rotate the polarization direction of the polarized light. Here, the polarization converter 120 may be a 1/4 wavelength plate. In addition, in this embodiment, there is an included angle of 45 degrees between the polarization converter 120 and the light splitting film 111 .

The bypass filter film 130 can be coated on the polarization converter 120 . In this embodiment, the polarization converter 120 is disposed between the beam splitting film 111 (or the beam splitting prism 110 ) and the bypass filter film 130 . In addition, as far as the setting purpose of the bypass filter film 130 is concerned, the bypass filter film 130 can be used to reflect light of a specific wavelength range and transmit light of another specific wavelength range (that is, when the incident angle When both are 0 degrees, the first light beam L1 can pass through the bypass filter film 130 , and the second light beam L2 will be reflected by the bypass filter film 130 ).

Next, the operation method of synthesizing three light beams with different wavelengths by the three-color light combining device 100 will be described.

Still as shown in FIG. 2, the first light beam L1 with the first wavelength, the second light beam L2 with the second wavelength, and the third light beam L3 with the third wavelength are irradiated to the three-color light combining device 100 from three different directions. . Here, the direction of the first light beam L1 entering the three-color light synthesis device 100 is perpendicular to the direction of the second light beam L2 and the direction of the third light beam L3 to the three-color light synthesis device 100 respectively. In addition, the first light beam L1 may be in the form of non-polarized light or P-polarized light, the third light beam L3 may be in the form of non-polarized light or S-polarized light, and the second light beam L2 may be in the form of S-polarized light. In addition, with regard to the design specifications of the bypass filter film 130 of this embodiment, it can allow the first light beam L1 with the first wavelength to be highly transmitted and the second light beam L2 with the second wavelength to be highly reflective (when when the incident angle is 0 degrees).

As for the first light beam L1 having the first wavelength, it can sequentially pass through the bypass filter film 130, the polarization converter 120, and the splitting film 111 (of the splitting prism 110) to be output from the three-color light combining device 100. terminal 140 output.

As for the second light beam L2 having the second wavelength, it will strike the beam splitting film 111 (of the beam splitting prism 110 ) at an incident angle of 45 degrees. Here, since the second light beam L2 is in the form of S-polarized light, it will be reflected by the beam splitting film 111 into the polarization converter 120 at a reflection angle of 45 degrees. At this time, the second light beam L2 will have a phase delay of 45 degrees due to the action of the polarization converter 120 . Then, the second light beam L2 is reflected by the bypass filter film 130 and enters the polarization converter 120 again, thus generating a phase delay of 45 degrees. Here, since the second light beam L2 exiting the polarization converter 120 has produced a phase delay of 90 degrees in total, the second light beam L2 has been rotated or converted into a form of P-polarized light. Then, the second light beam L2 is irradiated to the light splitting film 111 again. At this time, the second light beam L2 that has been rotated or converted into P-polarized light directly passes through the light splitting film 111 and is output from the output end 140 of the three-color light combining device 100 .

As for the third light beam L3 having the third wavelength, it also hits the beam splitting film 111 (of the beam splitting prism 110 ) at an incident angle of 45 degrees. Here, the third light beam L3 is reflected by the light splitting film 111 at a reflection angle of 45 degrees, and thus is output from the output end 140 of the three-color light combining device 100 .

As mentioned above, the first light beam L1 , the second light beam L2 and the third light beam L3 may be combined after being output from the output terminal 140 .

second embodiment

In this embodiment, the same components as those in the first embodiment are marked with the same symbols.

Please refer to FIG. 3 , the three-color light synthesis device 100' of this embodiment mainly includes a transparent plate 110', a light splitting film 111, a polarization converter 120 and a bypass filter film 130.

The light splitting film 111 is coated on the transparent plate 110'. Similarly, the beam-splitting film 111 is also a special coating that combines the characteristics of the dichroic beam-splitting film and the polarizing beam-splitting film, so it has the characteristics of reflecting the S polarized light of the second light beam L2 and allowing its P polarized light to pass through. Meanwhile, the light splitting film 111 can reflect the third light beam L3 and allow the first light beam L1 to pass through.

The polarization converter 120 is adjacent to the transparent plate 110' and the light splitting film 111, and is mainly used to rotate the polarization direction of the polarized light.

As for other component structures, features or operation methods of this embodiment are the same as those of the first embodiment, in order to make the description of the present invention clearer and easier to understand, repeated descriptions thereof are omitted here.

third embodiment

In this embodiment, the same components as those in the first embodiment are marked with the same symbols.

Referring to FIG. 4 , the three-color light synthesis device 100 ″ of this embodiment mainly includes a dichroic prism 110 , a polarization converter 120 and a bypass filter film 130 .

The dichroic prism 110 has a dichroic film 111 . That is, the dichroic film 111 is coated in the dichroic prism 110 . In this embodiment, the light-splitting film 111 is a special coating formed by combining the properties of the dichroic light-splitting film and the polarized light-splitting film. Here, the dichroic film 111 of this embodiment has the characteristics of reflecting the S-polarized light of the second light beam L2 and allowing its P-polarized light to pass through. At the same time, the dichroic film 111 can reflect the third light beam L3 and allow the first light beam L1 to pass through. through.

The bypass filter film 130 can be coated on the polarization converter 120 . In this embodiment, the bypass filter film 130 can be used to reflect light in a specific wavelength range and transmit light in another specific wavelength range (that is, when the incident angles are all 0 degrees, the third The light beam L3 can pass through the bypass filter film 130 , and the second light beam L2 will be reflected by the bypass filter film 130 ).

As for other component structures or features of this embodiment are the same as those of the first embodiment, in order to make the description of the present invention clearer and easier to understand, repeated descriptions thereof are omitted here.

Next, the operation method of synthesizing three kinds of light beams with different wavelengths by the three-color light combining device 100 ″ will be described.

Still as shown in FIG. 4 , the first light beam L1 with the first wavelength, the second light beam L2 with the second wavelength, and the third light beam L3 with the third wavelength are irradiated to the three-color light combining device 100 from three different directions. ". Here, the direction in which the first light beam L1 shoots to the three-color light synthesis device 100" is perpendicular to the direction in which the second light beam L2 shoots to the three-color light synthesis device 100" and the direction in which the third light beam L3 shoots to the three-color light synthesis device 100" "The direction is vertical. In addition, the first light beam L1 may be in the form of non-polarized light or P-polarized light, the third light beam L3 may be in the form of non-polarized light or S-polarized light, and the second light beam L2 may be in the form of P-polarized light. In addition, with regard to the design specification of the bypass filter film 130 of this embodiment, it can allow the third light beam L3 with the third wavelength to be highly transparent and make the second light beam L2 with the second wavelength to be highly reflective (when when the incident angle is 0 degrees).

As for the first light beam L1 having the first wavelength, it can directly pass through the light splitting film 111 and output from the output end 140 of the three-color light combining device 100 ″.

As for the second light beam L2 having the second wavelength, it will strike the beam splitting film 111 (of the beam splitting prism 110 ) at an incident angle of 45 degrees. Here, since the second light beam L2 is in the form of P-polarized light, it directly passes through the beam splitting film 111 and enters the polarization converter 120 . At this time, the second light beam L2 will have a phase delay of 45 degrees due to the action of the polarization converter 120 . Then, the second light beam L2 is reflected by the bypass filter film 130 and enters the polarization converter 120 again, thus generating a phase delay of 45 degrees. Here, since the second light beam L2 exiting the polarization converter 120 has a phase delay of 90 degrees in total, the second light beam L2 has been rotated or converted into S-polarized light. Then, the second light beam L2 is irradiated to the light splitting film 111 again. At this time, the second light beam L2 that has been rotated or converted into S-polarized light is reflected by the light splitting film 111 at a reflection angle of 45 degrees and output from the output end 140 of the three-color light combining device 100 ″.

As for the third light beam L3 having the third wavelength, it first passes through the bypass filter film 130 and the polarization converter 120 in sequence, and then hits the dichroic film (of the dichroic prism 110 ) at an incident angle of 45 degrees. 111. Here, the third light beam L3 is reflected by the dichroic film 111 at a reflection angle of 45 degrees, and thus is output from the output end 140 of the three-color light combining device 100 ″.

As mentioned above, the first light beam L1 , the second light beam L2 and the third light beam L3 may be combined after being output from the output terminal 140 .

In summary, since the three-color light synthesis device disclosed in the present invention can omit the use of at least one dichroic prism, its overall volume can be effectively reduced. Therefore, the three-color light synthesis device disclosed in the present invention can be easily applied in a micro projector. In addition, since the assembly of the three-color light synthesis device disclosed in the present invention is simple, assembly errors can be greatly reduced, and additional manufacturing costs are not required. In addition, since the three-color light synthesis device disclosed in the present invention has fewer components, its manufacturing cost can be reduced.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, this The scope of protection of the invention should be defined by the claims.

Claims (5)

1. a coloured light synthesizer is characterized in that, comprising:

Spectro-film;

Polarization converter is adjacent to this spectro-film, in order to rotation polar biased polarisation of light direction, wherein, has 45 degree angles between this polarization converter and this spectro-film; And

The bypass filter coating is formed on this polarization converter, and wherein, this polarization converter is arranged between this spectro-film and this bypass filter coating.

2. three coloured light synthesizers as claimed in claim 1 is characterized in that, more comprise Amici prism, are adjacent to this polarization converter, and wherein, this spectro-film is formed among this Amici prism.

3. three coloured light synthesizers as claimed in claim 1 is characterized in that, more comprise transparent plate, are adjacent to this polarization converter, and wherein, this spectro-film is formed on this transparent plate.

4. three coloured light synthesizers as claimed in claim 1 is characterized in that, this spectro-film has combined double-colored to the characteristic of spectro-film with the polarization spectro-film.

5. three coloured light synthesizers as claimed in claim 1 is characterized in that this polarization converter comprises 1/4 wavelength plate.

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