CN114296249B - Three-beam splitter prism and preparation method thereof - Google Patents
Three-beam splitter prism and preparation method thereof Download PDFInfo
- Publication number
- CN114296249B CN114296249B CN202210009613.6A CN202210009613A CN114296249B CN 114296249 B CN114296249 B CN 114296249B CN 202210009613 A CN202210009613 A CN 202210009613A CN 114296249 B CN114296249 B CN 114296249B
- Authority
- CN
- China
- Prior art keywords
- triangular prism
- emergent
- prism
- bonding
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention relates to a three-beam splitterA prism including a first triangular prism and a second triangular prism which are overlapped and the overlapped surface is partially glued; the first triangular prism comprises a first incident surface, a first emergent surface and a first bonding surface, and the second triangular prism comprises a second bonding surface, a second emergent surface and a third emergent surface; the included angle between the first incident surface and the first emergent surface is theta 1 Wherein 90 DEG > theta 1 ＞arcsin1/n 1 The included angle between the second bonding surface and the third emergent surface is theta 2 Wherein 90 DEG > theta 2 ＞arcsin1/n 2 ，n 2 And a bonding layer close to one side of the first emergent surface and one side of the second emergent surface and an unbonded air layer far from one side of the first emergent surface and one side of the second emergent surface are arranged between the bonding surfaces of the first triangular prism and the second triangular prism for the refractive index of the second triangular prism. The prism can separate three light beams by only 2 prisms, and has simple structure and easy preparation.
Description
Technical Field
The invention relates to a three-beam splitter prism and a preparation method thereof.
Background
The beam splitting prism can split one beam of light into more than two beams of light, the common beam splitting prism consists of two isosceles right triangles, can split one beam of light into two beams, and can regulate and control the energy ratio of the two split beams of light through the design of a beam splitting film so as to meet the application requirements of different optical systems.
A dichroic prism generally composed of 2 prisms can only split two light beams, but some special optical systems require a dichroic prism composed of 2 prisms.
Disclosure of Invention
The invention provides a three-beam splitting prism and a preparation method thereof, and the three-beam splitting prism can split three beams only by 2 prisms and has simple structure and easy preparation.
A three-beam splitter prism comprises a first triangular prism and a second triangular prism which are overlapped and are partially glued on the overlapped surface;
the first triangular prism comprises a first incident surface, a first emergent surface and a first bonding surface, and the second triangular prism comprises a second bonding surface, a second emergent surface and a third emergent surface;
the included angle between the first incident surface and the first emergent surface is theta 1 Wherein 90 DEG > theta 1 ＞arcsin1/n 1 ，n 1 The refractive index of the first triangular prism; the included angle between the first incident surface and the first bonding surface is smaller than 90 degrees;
the included angle between the second bonding surface and the third emergent surface is theta 2 Wherein 90 DEG > theta 2 ＞arcsin1/n 2 ，n 2 The refractive index of the second triangular prism is that the included angle between the second bonding surface and the second emergent surface is smaller than 90 degrees;
a bonding layer close to one side of the first emergent surface and one side of the second emergent surface and an unbonded air layer far away from one side of the first emergent surface and one side of the second emergent surface are arranged between bonding surfaces of the first triangular prism and the second triangular prism;
the first glued surface is plated with a first light-splitting film, and the second emergent surface is plated with a second light-splitting film.
Further, the first incident surface, the first emergent surface and the third emergent surface are all plated with an antireflection film.
Further, the inverse transmittance of the first light-splitting film is 2:1, and the inverse transmittance of the second light-splitting film is 1:1.
Further, the first triangular prism is K9 glass, and the second triangular prism is K9 glass.
Further, the bonding layer is made of ultraviolet glue or epoxy resin.
In the scheme, incident light enters from a first incident surface S1, and after reaching a second emergent surface S3 through a first triangular prism, part of light reflects another part of light to be refracted and passes through the second emergent surface S3;
the light reflected on the second emergent surface S3 reaches the first incident surface S1 through the first triangular prism and is totally reflected and then vertically emergent from the first emergent surface S2 through the first triangular prism;
the light passing through the second exit surface S3 sequentially passes through the adhesive layer, the second incident surface S4 and the second triangular prism to reach the second exit surface, then a part of the light is refracted to pass through the second exit surface S6 to exit the second triangular prism, and another part of the light is reflected at the second exit surface S6 to pass through the second triangular prism to reach the air layer of the second adhesive surface S4 and is totally reflected at the second adhesive surface S4, and then passes through the second triangular prism to be emitted vertically from the third exit surface S5.
Incident light T perpendicularly enters from the first incident surface, and the incident angle of the reflected light on the first incident surface is also θ 1 ，，n 1 Refractive index of the first triangular prism, θ 1 Satisfy the total reflection angle theta 1 Greater than arcsin1/n 1 The method comprises the steps of carrying out a first treatment on the surface of the The incidence angle of the reflected light on the second bonding surface is theta 2 ，n 2 Refractive index of the second triangular prism, θ 2 Satisfy the total reflection angle theta 2 Greater than arcsin1/n 2 。
Compared with the prior art, the invention has the following beneficial effects: the prism can separate three light beams by only 2 prisms, and has simple structure and easy preparation.
Further, when a reasonable light-splitting film is arranged, the proportion of three beams of light can be controlled.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a schematic view of the optical path of the present invention.
Detailed Description
The invention will be further elucidated with reference to the drawings and the detailed description
Example 1
As shown in fig. 1, a three-way prism includes a first triangular prism 1 and a second triangular prism 2 which are overlapped and partially glued at the overlapped surfaces;
the first triangular prism 1 comprises a first incident surface 1-1, a first emergent surface 1-2 and a first bonding surface 1-3, and the second triangular prism 2 comprises a second bonding surface 2-1, a second emergent surface 2-2 and a third emergent surface 2-3;
the included angle between the first incident surface 1-1 and the first emergent surface 1-2 is theta 1 Wherein 90 DEG > theta 1 ＞arcsin1/n 1 ，n 1 The refractive index of the first triangular prism 1; the included angle between the first incidence surface 1-1 and the first bonding surface 1-3 is smaller than 90 degrees;
said firstThe included angle between the two bonding surfaces 2-1 and the third emergent surface 2-3 is theta 2 Wherein 90 DEG > theta 2 ＞arcsin1/n 2 ，n 2 The included angle between the second bonding surface 2-1 and the second emergent surface 2-2 is smaller than 90 degrees for the refractive index of the second triangular prism 2;
a bonding layer 3 close to one side of the first emergent surface 1-2 and one side of the second emergent surface 2-2 and an unbonded air layer 4 far away from one side of the first emergent surface 1-2 and one side of the second emergent surface 2-2 are arranged between bonding surfaces of the first triangular prism 1 and the second triangular prism 2;
the first bonding surface 1-3 is plated with a first light-splitting film 6, and the second outgoing surface 2-2 is plated with a second light-splitting film 7.
Further, the first incident surface 1-1, the first emergent surface 1-2 and the third emergent surface 2-3 are all plated with an antireflection film 5.
Further, the inverse transmittance of the first light splitting film 6 is 2:1, and the inverse transmittance of the second light splitting film 7 is 1:1.
Further, the first triangular prism 1 is K9 glass, and the second triangular prism 2 is K9 glass. The total reflection angle of the K9 glass is 41 degrees.
Further, the adhesive layer 3 is made of ultraviolet glue or epoxy resin by the adhesive layer 3.
As shown in fig. 2, in this embodiment, incident light enters from the first incident surface S11-1, passes through the first triangular prism 1, reaches the second exit surface S31-3, and then, reflects a part of light and refracts another part of light, and passes through the second exit surface S31-3;
the light reflected on the second exit surface S31-3 reaches the first incident surface S11-1 through the first triangular prism 1 and is emitted vertically from the first exit surface S21-2 through the first triangular prism 1 after being totally reflected;
the light passing through the second exit surface S31-3 sequentially passes through the adhesive layer 3, the second incident surface S42-1 and the second triangular prism 2 to reach the second exit surface 2-2, then a part of the light is refracted to exit the second triangular prism 2 through the second exit surface S62-2, and another part of the light is reflected at the second exit surface S62-2 to pass through the second triangular prism 2 to reach the air layer 4 of the second adhesive surface S42-1 and is totally reflected at the second adhesive surface S42-1, and then passes through the second triangular prism 2 to exit perpendicularly from the third exit surface S52-3.
Incident light T perpendicularly enters from the first incident surface 1-1, and the incident angle of the reflected light on the first emergent surface 1-2 is also θ 1 ，n 1 The refractive index of the first triangular prism 1, θ 1 ＝arcsin1/n 1 The reflected light is emitted vertically at the first bonding surface 1-3; the incident angle of the reflected light on the second bonding surface 2-1 is theta 2 ，n 2 Refractive index of the second triangular prism 2, θ 2 ＝arcsin1/n 2 The reflected light is emitted vertically at the third emission surface 2-3.
The angle between the first incident plane 1-1 and the first emergent plane 1-2 in this embodiment is θ 1 48 degrees, wherein the included angle between the first incident surface 1-1 and the first bonding surface 1-3 is 24 degrees;
the included angle between the second bonding surface 2-1 and the third emergent surface 2-3 is theta 2 48 degrees, wherein the included angle between the second bonding surface 2-1 and the second emergent surface 2-2 is 36 degrees;
the incident light T is perpendicularly incident from the first incident surface 1-1, and the incident angle of the reflected light on the first incident surface 1-1 is also θ 1 ，n 1 The refractive index of the first triangular prism 1, θ 1 Greater than arcsin1/n 1 The method comprises the steps of carrying out a first treatment on the surface of the The incident angle of the reflected light on the second bonding surface 2-1 is theta 2 ，n 2 Refractive index of the second triangular prism 2, θ 2 Greater than arcsin1/n 2 。
The present invention is not limited to the above embodiments, but any modifications or substitutions according to the principles of the present invention should be considered as falling within the scope of the present invention.
Claims (6)
1. A preparation method of a three-beam splitter prism is characterized by comprising the following steps: the method comprises the following steps:
preparing a first triangular prism (1) and a second triangular prism (2), polishing and cleaning, plating a first light-splitting film (6) on a first bonding surface (1-3), plating a second light-splitting film (7) on a second emergent surface (2-2),
confirming a gluing layer (3) area and an air layer (4) area between the first gluing surface (1-3) and the second gluing surface (2-1), wherein the gluing layer (3) is close to one side of the first outgoing surface (1-2) and the second outgoing surface (2-2), and the air layer (4) is far away from one side of the first outgoing surface (1-2) and the second outgoing surface (2-2); then fixing the micro barrier strips in the middle of the gluing layer (3) area and the air layer (4) area in a dispensing mode, aligning the first gluing surface (1-3) and the second gluing surface (2-1) by a mechanical or optical positioning method, and then injecting glue in the gluing layer (3) area; finally, an ultraviolet light source is adopted to irradiate the glued surface, so that the glue is solidified, and the two optical surfaces are tightly fixed together;
the three-beam splitter prism comprises a first triangular prism (1) and a second triangular prism (2) which are overlapped and the overlapped surface parts are glued;
the first triangular prism (1) comprises a first incidence surface (1-1), a first emergent surface (1-2) and a first bonding surface (1-3), and the second triangular prism (2) comprises a second bonding surface (2-1), a second emergent surface (2-2) and a third emergent surface (2-3);
the included angle between the first incident surface (1-1) and the first emergent surface (1-2) is theta 1 Wherein 90 DEG > theta 1 ＞arcsin1/n 1 ，n 1 Is the refractive index of the first triangular prism (1); the included angle between the first incidence surface (1-1) and the first bonding surface (1-3) is smaller than 90 degrees;
the included angle between the second bonding surface (2-1) and the third emergent surface (2-3) is theta 2 Wherein 90 DEG > theta 2 ＞arcsin1/n 2 ，n 2 The refractive index of the second triangular prism (2) is that the included angle between the second bonding surface (2-1) and the second emergent surface (2-2) is smaller than 90 degrees;
a bonding layer (3) close to one side of the first emergent surface (1-2) and one side of the second emergent surface (2-2) and an unbonded air layer (4) far from one side of the first emergent surface (1-2) and one side of the second emergent surface (2-2) are arranged between bonding surfaces of the first triangular prism (1) and the second triangular prism (2);
the first bonding surface (1-3) is plated with a first light-splitting film (6), and the second emergent surface (2-2) is plated with a second light-splitting film (7).
2. The method for preparing the three-dimensional prism according to claim 1, wherein: the first incident surface (1-1), the first emergent surface (1-2) and the third emergent surface (2-3) are all plated with an antireflection film (5).
3. The method for preparing the three-dimensional prism according to claim 1, wherein: the transmission ratio of the first light-splitting film (6) is 2:1, and the transmission ratio of the second light-splitting film (7) is 1:1.
4. The method for preparing the three-dimensional prism according to claim 1, wherein: the first triangular prism (1) is K9 glass, and the second triangular prism (2) is K9 glass.
5. The method for preparing the three-dimensional prism according to claim 1, wherein: the cementing layer (3) is made of ultraviolet glue.
6. The method for preparing the three-dimensional prism according to claim 1, wherein: after the glue is injected, checking whether the glue is completely filled under the bright light source condition; if the glue is not completely filled, the glue is completely filled in the area of the glued layer (3) by adopting a pressurizing or negative pressure method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009613.6A CN114296249B (en) | 2022-01-06 | 2022-01-06 | Three-beam splitter prism and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210009613.6A CN114296249B (en) | 2022-01-06 | 2022-01-06 | Three-beam splitter prism and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114296249A CN114296249A (en) | 2022-04-08 |
| CN114296249B true CN114296249B (en) | 2023-08-29 |
Family
ID=80974603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210009613.6A Active CN114296249B (en) | 2022-01-06 | 2022-01-06 | Three-beam splitter prism and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114296249B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539668A (en) * | 2008-03-21 | 2009-09-23 | 中国科学院西安光学精密机械研究所 | Light-splitting prism |
| CN201449491U (en) * | 2009-05-20 | 2010-05-05 | 中国科学院西安光学精密机械研究所 | Device by utilizing dispersion prism to realize CCD array splicing |
| CN104122741A (en) * | 2013-04-26 | 2014-10-29 | 日立乐金光科技株式会社 | Optical unit and projective display device |
| CN112799234A (en) * | 2019-11-13 | 2021-05-14 | 舜宇光学（浙江）研究院有限公司 | Color combination device and method and lighting system |
-
2022
- 2022-01-06 CN CN202210009613.6A patent/CN114296249B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539668A (en) * | 2008-03-21 | 2009-09-23 | 中国科学院西安光学精密机械研究所 | Light-splitting prism |
| CN201449491U (en) * | 2009-05-20 | 2010-05-05 | 中国科学院西安光学精密机械研究所 | Device by utilizing dispersion prism to realize CCD array splicing |
| CN104122741A (en) * | 2013-04-26 | 2014-10-29 | 日立乐金光科技株式会社 | Optical unit and projective display device |
| CN112799234A (en) * | 2019-11-13 | 2021-05-14 | 舜宇光学（浙江）研究院有限公司 | Color combination device and method and lighting system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114296249A (en) | 2022-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6876653B2 (en) | Optical component array | |
| KR100384084B1 (en) | Method for manufacturing a polarization beam splitter | |
| US20120268720A1 (en) | Optical device, method for manufacturing the same, and projector apparatus including the same | |
| TW201721205A (en) | Optical component with beam deflection element, method for production thereof, and beam deflection elements suitable for the component | |
| US20200233161A1 (en) | Optical assembly and manufacturing method thereof | |
| JP2015522852A5 (en) | ||
| US20130038933A1 (en) | Beam splitter and method for manufacturing the same | |
| CN209895095U (en) | Polarization beam splitter prism and 3D projection light modulation system | |
| CN101981488A (en) | Prism beamsplitters | |
| CN114296249B (en) | Three-beam splitter prism and preparation method thereof | |
| CN108490720A (en) | A kind of bonding prism assemblies and projection light machine with the air gap | |
| CN105717564B (en) | Depolarization pentagonal prism and preparation method thereof | |
| CN207992488U (en) | Prism capable of shortening focal length | |
| CN216595765U (en) | Three-beam-splitting prism system | |
| CN101101376A (en) | Color-combination prism manufacturing method | |
| CN101419341B (en) | Polarization converter and projecting system with the Polarization converter | |
| CN112782828A (en) | Reflecting prism structure | |
| CN208621776U (en) | Beam splitting Prism subassembly | |
| JP2001021751A (en) | Optical branching/coupling instrument | |
| CN215932344U (en) | Optical rod and silicon-based liquid crystal optical machine | |
| CN218446055U (en) | Steering prism | |
| CN218728383U (en) | Y-shaped optical structure with extended exit pupil | |
| CN116626908A (en) | Polarization beam splitter and manufacturing method thereof | |
| JPH08211206A (en) | Beam splitter and its production and optical pickup | |
| CN106707450A (en) | Prism assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |