CN213517861U - Illumination optical system and miniature projector - Google Patents
Illumination optical system and miniature projector Download PDFInfo
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- CN213517861U CN213517861U CN202022702198.1U CN202022702198U CN213517861U CN 213517861 U CN213517861 U CN 213517861U CN 202022702198 U CN202022702198 U CN 202022702198U CN 213517861 U CN213517861 U CN 213517861U
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Abstract
The utility model discloses an illumination optical system, including red green blue three-colour LED light source, collimating lens group, dichroic mirror group and fly's eye lens, red green blue three-colour LED light source emergent light direction all is provided with collimating lens group to form concave type structure, dichroic mirror group sets up in concave type structure, and fly's eye lens sets up in concave type structure's opening part, and emergent light that red green blue three-colour LED light source sent is collimated through collimating lens group, obtains the even RGB light of mixed light by dichroic mirror group transmission and/or reflection to fly's eye lens again. Meanwhile, a micro projector with the illumination optical system is also disclosed. The illumination optical system of the utility model is arranged in a concave shape, and the two dichroic mirrors are arranged in an X shape, thereby greatly reducing the volume of the illumination optical system; and the green light luminous quantity of the green LED light source is improved, so that the projected RGB light is more uniform, and the imaging effect of the micro projector is improved.
Description
Technical Field
The utility model relates to the field of projection technology, in particular to illumination optical system and miniature projecting apparatus.
Background
With the development of technology, micro projectors have become popular personal and household consumer products. The existing projector light source usually adopts the light emitted by the excitation light source to irradiate the fluorescence wheel to generate the radiation fluorescence, and the fluorescence wheel is provided with a transmission area for transmitting the light emitted by the excitation light source, so that the light transmitted from the transmission area can be combined with the radiation fluorescence after being reflected and converted for many times, the light path is complex, the number of lens components is large, the occupied volume is large, and the cost is high. Moreover, the green light emission of the illumination optical system of the existing micro projector is very limited, which results in insufficient color expression of the combined micro LED micro projector, and therefore, the existing micro projector product has the defects of overlarge volume and insufficient green light.
SUMMERY OF THE UTILITY MODEL
For solving the problem that exists among the prior art, the utility model aims at providing a lighting optical system and miniature projecting apparatus, this lighting optical system are concave type setting, and increase the third dichroic mirror of a reflection blue light at red green blue LED light source's the light part that closes to promote the green glow luminous flux of green LED light source, promote the color performance of miniature LED miniature projecting apparatus.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides an illumination optical system, includes red green blue tristimulus LED light source, collimating lens group, dichroic mirror group and fly's eye lens, red green blue tristimulus LED light source is red LED light source, green LED light source and blue LED light source respectively, and the emergent light direction all is provided with collimating lens group, red green blue tristimulus LED light source and collimating lens group form concave structure, and dichroic mirror group sets up in concave structure, and fly's eye lens set sets up in the opening part of concave structure, and during operation, the emergent light that red green blue tristimulus LED light source sent is through collimating lens group to by dichroic mirror group transmission and/or reflection to fly's eye lens, thereby obtain the even RGB light of mixed light.
Further, the dichroic mirror group comprises a first dichroic mirror, a second dichroic mirror and a third dichroic mirror, wherein the first dichroic mirror and the second dichroic mirror are arranged inside the concave structure in a 90-degree crossed manner, and the third dichroic mirror is arranged on one side of the concave structure, which is connected with one end of the first dichroic mirror and one end of the second dichroic mirror by 45 degrees.
In one embodiment, the third dichroic mirror is disposed on a side of the red LED light source.
In another embodiment, the third dichroic mirror is disposed on a side of the green LED light source.
Further, the red LED light source and the blue LED light source are respectively arranged on the left side and the right side of the green LED light source.
Furthermore, two surfaces of the dichroic mirror group are respectively plated with a color separation film and an antireflection film.
Furthermore, the second dichroic mirror and the third dichroic mirror transmit red, green and blue light, and the first dichroic mirror transmits blue, green and red light.
Furthermore, the surface of the green LED light source is coated with fluorescent powder, and the fluorescent powder on the surface of the green LED light source is excited by blue light to emit green light, so that the emergent light of the green LED light source comprises the green light and the blue light.
And simultaneously, the technical scheme of the utility model still includes a miniature projecting apparatus, a serial communication port, including foretell illumination optical system.
The utility model has the advantages that:
the lighting optical system of the utility model is arranged in a concave shape, three dichroic mirrors are arranged in the lighting optical system, two of the dichroic mirrors are arranged in an X shape, and the volume of the lighting optical system is greatly reduced; under the condition of not increasing power consumption, the green light luminous quantity of the green LED light source is improved, the RGB light rays projected by the micro projector are more uniform, and the imaging effect of the micro projector is improved.
Drawings
Fig. 1 is a schematic structural diagram of an illumination optical system according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an illumination optical system according to a second embodiment of the present invention.
Reference numerals: 311-green LED light source; 312-blue LED light source 312; 313-red LED light source; 321-a first collimating lens group; 322-a second collimating lens group; 323-a third collimating lens group; 331-a first dichroic mirror; 332-a second dichroic mirror; 333-a third dichroic mirror; 34-fly eye lens.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments.
The following description of the present invention will be made with reference to the accompanying drawings 1-2.
The utility model discloses an illumination optical system, including red green blue three-colour LED light source, collimating lens group, dichroic mirror group and fly's eye lens, the emergent light direction of red green blue three-colour LED light source is provided with collimating lens group respectively, red green blue three-colour LED light source and collimating lens group form concave type structure, dichroic mirror group sets up in concave type structure, fly's eye lens sets up in concave type structure's opening part, in operation, the emergent light that red green blue three-colour LED light source sent assembles through the collimating lens group who corresponds respectively, and transmit and/or reflect to fly's eye lens by dichroic mirror group, thereby obtain the even RGB light of mixed light.
In the first embodiment, the first step is,
as shown in fig. 1, the illumination optical system of the present embodiment includes a red, green, and blue LED light source composed of a green LED light source 311, a blue LED light source 312, and a red LED light source 313, where the red LED light source and the blue LED light source are respectively disposed at the left and right sides of the green LED light source, the red LED light source and the blue LED light source are coaxial, and the green LED light source, the red LED light source, and the blue LED light source are at 90 degrees. And three collimating lens groups, namely a first collimating lens group 321, a second collimating lens group 322 and a red collimating lens 323, are arranged corresponding to the three light sources. The dichroic mirror group comprises a first dichroic mirror, a second dichroic mirror and a third dichroic mirror. First dichroic mirror and second dichroic mirror are the X type cross arrangement that 90 is in the inside intermediate position of concave type structure, and wherein, first dichroic mirror one end is 45 jiaos with the left side of green LED light source and places, and second dichroic mirror one end is 45 jiaos with the right side of green LED light source and places. The third dichroic mirror is arranged on one side of the red LED light source in the concave structure and is respectively connected with the end parts of the first dichroic mirror and the second dichroic mirror at an angle of 45 degrees.
In this embodiment, the first dichroic mirror, the second dichroic mirror, and the third dichroic mirror are all coated with a color separation film on one surface, and an antireflection film on the other surface. The first dichroic mirror is characterized in that the first dichroic mirror reflects red and transmits blue-green when light is incident at 45 degrees, the second dichroic mirror reflects blue and transmits red and green when the light is incident at 45 degrees, and the third dichroic mirror reflects blue and transmits red and green when the light is incident at 90 degrees. The green light component emitted by the green LED light source of this embodiment is collimated by the first collimating lens group 321, and then transmitted through the first dichroic mirror or the second dichroic mirror, respectively, to enter the fly-eye lens 34. The red light emitted by the red LED light source is collimated by the third collimating lens group 323, transmitted by the third dichroic mirror, transmitted by the second dichroic mirror or directly reflected by the first dichroic mirror to enter the fly eye lens. Blue light emitted by the blue LED light source is collimated by blue collimating lens group 322, and then transmitted through the first dichroic mirror or directly reflected by the second dichroic mirror into fly eye lens 34.
Preferably, the surface of the green LED light source is coated with phosphor, and the green LED light source emits green light by exciting a specific phosphor on the surface with blue light, so that the emergent light of the green LED light source includes two components, namely green light emitted after the excitation of the phosphor and blue light not excited by the phosphor. Blue light emitted by the green LED light source is collimated by the green light collimating lens group 321, is transmitted by the first dichroic mirror and reflected by the second dichroic mirror to the third dichroic mirror, and is reflected back to the original path by the third dichroic mirror until reaching the green LED light source, so that fluorescent powder on the green LED light source is excited to emit more green light, and is collimated by the green light collimating lens group 321, and the first dichroic mirror and the second dichroic mirror are transmitted to the fly eye lens. A closed loop of blue light is formed through the third dichroic mirror, so that the content of green light components of the green LED light source is improved, and RGB light with uniform light mixing is obtained.
In the second embodiment, the first embodiment of the method,
as shown in fig. 2, an illumination optical system of the present embodiment is different from the second embodiment in that a third dichroic mirror is disposed on the green LED light source side in a concave structure.
The green light emitted from the green LED light source of this embodiment is collimated by the first collimating lens group 321, and then transmitted by the third dichroic mirror 333, the first dichroic mirror, and/or the first dichroic mirror to the fly eye lens. Blue light emitted by the green LED light source is collimated by the first collimating lens group 321, reflected by the third dichroic mirror 333, converged back to the green LED light source by the first collimating lens group 321, re-excited by fluorescent powder on the green LED light source to emit more green light, then collimated by the first collimating lens group 321, transmitted by the third dichroic mirror 333, and transmitted by the first dichroic mirror 331 or transmitted by the second dichroic mirror 332 to the fly eye lens. The red light emitted by the red LED light source 313 is collimated by the third collimating lens group 323, and then transmitted by the second dichroic mirror or directly reflected by the first dichroic mirror to enter the fly-eye lens. Blue light emitted by the blue LED light source 312 is collimated by the second collimating lens group 322, transmitted by the first dichroic mirror 331, reflected by the second dichroic mirror 332 to the fly eye lens, and reflected and transmitted by the light to obtain RGB light with uniform light mixing.
In the third embodiment, the first step is that,
the micro projector of the embodiment includes the illumination optical system in the first or second embodiment and other structures, and performs projection through the illumination optical system, so that RGB light projected by the micro projector is more uniform, and an imaging effect of the micro projector is improved.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (9)
1. The utility model provides an illumination optical system, its characterized in that, includes red green blue tristimulus LED light source, collimating lens group, dichroic mirror group and fly-eye lens, red green blue tristimulus LED light source is red LED light source, green LED light source and blue LED light source respectively, and the emergent light direction all is provided with collimating lens group, red green blue tristimulus LED light source and collimating lens group form concave structure, and dichroic mirror group sets up in concave structure, and fly-eye lens sets up in concave structure's opening part, and during operation, the emergent light that red green blue tristimulus LED light source sent is through collimating lens group to transmit and/or reflect to fly-eye lens by dichroic mirror group, thereby obtain the even RGB light of mixed light.
2. The illumination optical system according to claim 1, wherein the dichroic mirror group includes a first dichroic mirror, a second dichroic mirror, and a third dichroic mirror, wherein the first and second dichroic mirrors are disposed inside the concave structure at a 90 ° cross, and the third dichroic mirror is disposed on one side inside the concave structure at a 45 ° connection with one ends of the first and second dichroic mirrors, respectively.
3. The illumination optical system according to claim 2, wherein the third dichroic mirror is provided on a red LED light source side.
4. The illumination optical system according to claim 2, wherein the third dichroic mirror is provided on a green LED light source side.
5. The illumination optical system according to claim 3 or 4, wherein the red LED light source and the blue LED light source are disposed on left and right sides of the green LED light source, respectively.
6. The illumination optical system according to claim 5, wherein both surfaces of the dichroic mirror group are coated with a color separation film and an antireflection film, respectively.
7. The illumination optical system according to claim 5, wherein the second dichroic mirror and the third dichroic mirror transmit red-green-reflected blue light, and the first dichroic mirror transmits blue-green-reflected red light.
8. The illumination optical system according to claim 1, wherein the green LED light source surface is coated with a phosphor, and the phosphor on the green LED light source surface is excited by blue light to emit green light, so that the emitted light of the green LED light source includes green light and blue light.
9. A pico projector comprising the illumination optical system according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022702198.1U CN213517861U (en) | 2020-11-20 | 2020-11-20 | Illumination optical system and miniature projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022702198.1U CN213517861U (en) | 2020-11-20 | 2020-11-20 | Illumination optical system and miniature projector |
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| CN213517861U true CN213517861U (en) | 2021-06-22 |
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| CN202022702198.1U Active CN213517861U (en) | 2020-11-20 | 2020-11-20 | Illumination optical system and miniature projector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608402A (en) * | 2021-08-11 | 2021-11-05 | 四川长虹电器股份有限公司 | Lighting device and micro projector |
| CN114675411A (en) * | 2022-02-22 | 2022-06-28 | 徕卡显微系统科技(苏州)有限公司 | Filter element, light source module, multi-channel fluorescence lighting system and fluorescence microscope |
-
2020
- 2020-11-20 CN CN202022702198.1U patent/CN213517861U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113608402A (en) * | 2021-08-11 | 2021-11-05 | 四川长虹电器股份有限公司 | Lighting device and micro projector |
| CN114675411A (en) * | 2022-02-22 | 2022-06-28 | 徕卡显微系统科技(苏州)有限公司 | Filter element, light source module, multi-channel fluorescence lighting system and fluorescence microscope |
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