CN214540354U

CN214540354U - Optical fiber coupling light source module and optical fiber scanning imaging system

Info

Publication number: CN214540354U
Application number: CN202120546985.3U
Authority: CN
Inventors: 不公告发明人
Original assignee: Chengdu Idealsee Technology Co Ltd
Current assignee: Chengdu Idealsee Technology Co Ltd
Priority date: 2021-03-17
Filing date: 2021-03-17
Publication date: 2021-10-29
Anticipated expiration: 2031-03-17

Abstract

The utility model discloses an optical fiber coupling light source module and optic fibre scanning imaging system, include: an input light source comprising an image light source and a detection light source; the image light source comprises two groups of light sources, each group of light source at least comprises R, G, B light-emitting units, the polarization states of light beams emitted by the two groups of light sources are different, one group is horizontal polarization, and the other group is vertical polarization; two groups of wavelength beam combining devices are respectively arranged on emergent light paths of the two groups of light sources; the light beams emitted by the two groups of light sources are combined by the corresponding wavelength beam combining device and then combined into a beam by the polarization beam combining device; and the image light beam emitted by the polarization beam combiner and the light beam emitted by the detection light source are coupled into the optical fiber through the coupling lens after being combined by the detection light beam combiner. The scheme is used for improving the power of the light source so as to meet the brightness requirement of the optical fiber scanning imaging system applied to a high-brightness scene.

Description

Optical fiber coupling light source module and optical fiber scanning imaging system

Technical Field

The utility model relates to a projection imaging field especially relates to an optical fiber coupling light source module and optic fibre scanning imaging system.

Background

The imaging principle of the optical fiber scanning imaging technology is that light corresponding to each pixel point of an image to be displayed is modulated through a light source, then, a scanner drives a scanning optical fiber to move at a high frequency, light corresponding to each pixel point is scanned and output, and therefore the light corresponding to each pixel point of the image to be displayed is projected onto a projection screen one by one to form a projection picture.

The laser light source has the advantages of good monochromaticity, high brightness, wide color gamut and the like, and can be used as a light source of an optical fiber scanning imaging technology. However, due to the limitation of the coupling efficiency between the light source and the optical fiber, the total power of the light source is not high at present, and the brightness requirement of the optical fiber scanning imaging system applied in some high-brightness scenes cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an optical fiber coupling light source module and optic fibre scanning imaging system for improve the power of light source, use the luminance requirement in the hi-lite scene in order to satisfy optic fibre scanning imaging system.

In order to realize the above object of the present invention, the first aspect of the present invention provides an optical fiber coupling light source module, including:

an input light source comprising an image light source and a detection light source; the image light source comprises two groups of light sources, each group of light source at least comprises R, G, B light-emitting units, and the polarization states of light beams emitted by the two groups of light sources are different;

two groups of wavelength beam combining devices are respectively arranged on emergent light paths of the two groups of light sources; the light beams emitted by the two groups of light sources are combined into two image light beams through the corresponding wavelength beam combining device;

the polarization beam combiner is coaxially arranged with one of the two groups of wavelength beam combiners, light beams emitted by the coaxial wavelength beam combiners directly enter the polarization beam combiner, light beams emitted by the other group of wavelength beam combiners enter the polarization beam combiner from the other side of the polarization beam combiner after being reflected by a reflector, and the two image light beams are combined into one image light beam after passing through the polarization beam combiner;

the detection light beam combining device is positioned behind the emergent light beam of the polarization beam combining device, the detection light source is positioned on the side edge of the detection light beam combining device, the emergent light beam of the detection light source is vertical to the emergent light beam of the polarization beam combining device, and the emergent light beam of the detection light source and the image light beam emergent from the polarization beam combining device are coupled into an optical fiber through a coupling lens after being combined into a whole through the detection light beam combining device.

Optionally, the polarization direction of the light beam emitted by one of the two groups of light sources is a horizontal direction, and the polarization direction of the light beam emitted by the other group of light sources is a vertical direction.

Optionally, the light source module includes a base, the two groups of light sources are disposed on the base, the mounting directions of the two groups of light sources are different, and the mounting direction of one group of light sources rotates 90 degrees around the light-emitting optical axis of the light source relative to the mounting direction of the other group of light sources, so that the propagation directions of the light beams emitted by the two groups of light sources are parallel, and the polarization directions are perpendicular to each other.

Optionally, the light source module includes a polarization state generator, and is disposed on an outgoing light path of any one of the two light sources.

Optionally, the polarization state generating device is a quarter-wave plate.

Optionally, the two groups of wavelength beam combining devices and the detection light beam combining device are both wavelength division thin film filters.

Optionally, the polarization beam combiner is a polarization beam combiner PBC.

Optionally, the detection light source is an infrared light source.

A second aspect of the embodiments of the present invention provides an optical fiber scanning imaging system, including the light source module and the optical scanning module according to the first aspect, wherein light emitted from the light source module is output by the optical scanning module as display image light; the optical scanning module comprises an actuator, an optical fiber in the light source module is fixed on the actuator, the optical fiber exceeds the actuator and forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to sweep in a three-dimensional space.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses in the scheme, the image light source includes two sets of light sources, every group light source includes R, G, B three kinds of luminescence units, the polarization state of the light beam of two sets of light source outgoing is different, then, it closes to restraint the device and the polarization closes to restraint the photosynthetic bundle of device with two sets of image light source outgoing to a bundle of image light through the wavelength, the optical fiber is gone into to the light that closes after image light sum detection light, thereby improve the total power of light source module, make it can satisfy the luminance requirement of optical fiber scanning imaging system in some hi-lite scenes.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive exercise according to the drawings:

fig. 1A-1B are schematic structural diagrams of an optical fiber scanning imaging system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an optical fiber coupling light source module according to an embodiment of the present invention;

fig. 3A-3B are schematic diagrams illustrating polarization states of two groups of light sources according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a polarization state generating device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In this specification, a fiber scanning imaging system will be described first. The optical fiber scanning imaging system utilizes an actuator in an optical fiber scanner to drive an optical fiber to vibrate at a high speed, and is matched with a laser modulation algorithm to realize the display of image information. As shown in fig. 1A, a conventional fiber scanning imaging system mainly includes: the optical fiber laser comprises a processor 100, a laser module 110, a fiber scanner 120, a transmission fiber 130, a light source modulation circuit 140, a scanning driving circuit 150 and a beam combining unit 160.

The processor 100 may be a Graphics Processing Unit (GPU), a Central Processing Unit (CPU), or other chips or circuits having a control function and an image Processing function, and is not limited in particular.

When the system works, the processor 100 can control the light source modulation circuit 140 to modulate the laser module 110 according to the image data to be displayed, in the embodiment of the present invention, the laser modulation mode is inner modulation. The laser module 110 includes a plurality of monochromatic lasers, which respectively emit light beams of different colors. As shown in fig. 1A, three-color lasers of Red (R), Green (G) and Blue (B) can be specifically used in the laser module. The light beams emitted by the lasers in the laser module 110 are combined into a laser beam by the beam combining unit 160 and coupled into the transmission fiber 130.

The processor 100 can also control the scan driving circuit 150 to drive the fiber scanner 120 to scan out the light beam transmitted in the transmission fiber 130.

The light beam scanned and output by the fiber scanner 120 acts on a certain pixel point position on the medium surface, and forms a light spot on the pixel point position, so that the pixel point position is scanned. Driven by the optical fiber scanner 120, the output end of the transmission optical fiber 130 scans according to a certain scanning track, so that the light beam moves to the corresponding pixel position for scanning. During actual scanning, the light beam output by the transmission fiber 130 will form a light spot with corresponding image information (e.g., color, gray scale or brightness) at each pixel location. In a frame time, the light beam traverses each pixel position at a high enough speed to complete the scanning of a frame image, and because the human eye observes the object and has the characteristic of 'visual residual', the human eye cannot perceive the movement of the light beam at each pixel position but sees a complete frame image.

With continued reference to FIG. 1B, a conventional fiber scanner 120 is shown, which mainly comprises: a piezoelectric actuator 121, a fiber optic cantilever 122, a lens 123, a scanner package 124, and a mount 125. The piezoelectric actuator 121 is fixed in the scanner package 124 through a fixing element 125, the transmission fiber 130 extends at a free end of the piezoelectric actuator 121 to form a fiber suspension 122 (also called as a scanning fiber), when the optical fiber scanner is in operation, the piezoelectric actuator 121 vibrates in the Y-axis direction and the X-axis direction under the driving of a scanning driving signal, and is driven by the piezoelectric actuator 121, the free end of the fiber suspension 122 sweeps along a preset track and emits a light beam, and the emitted light beam can pass through the lens 123 to scan on the surface of a medium. Wherein, the Y-axis direction intersects with the X-axis direction, obviously, the Y-axis direction and the X-axis direction may be perpendicular.

Please refer to fig. 2, which is a schematic structural diagram of an optical fiber coupling light source module according to an embodiment of the present invention, the optical fiber coupling light source module includes: an input light source including an image light source and a detection light source 23; the image light source comprises two groups of

light sources

21 and 22, each group of light source at least comprises R, G, B light-emitting units, and the polarization states of light beams emitted by the two groups of

light sources

21 and 22 are different; two groups of wavelength

beam combining devices

24 and 25 respectively arranged on the emergent light paths of the two groups of

light sources

21 and 22; a polarization beam combiner 26 disposed on the light paths of the two sets of wavelength beam combiners 24 and 25; the light beams emitted by the two groups of

light sources

21 and 22 are combined into two image light beams through the corresponding wavelength beam combining device; a polarization beam combiner 26, coaxially disposed with one of the two sets of wavelength beam combiners 24 and 25, wherein the light beam emitted from the coaxial wavelength beam combiner directly enters the polarization beam combiner 26, and the light beam emitted from the other set of wavelength beam combiner is reflected by a reflector 32, enters the polarization beam combiner 26 from the other side of the polarization beam combiner 26, is bent by 90 degrees by the polarization beam combiner 26, and is emitted in the same direction as the light beam directly entering the polarization beam combiner 26, so that the two image light beams are combined into one image light beam by the polarization beam combiner 26; the detection light beam combining device 27 is located behind the outgoing light beam of the polarization beam combining device 26, the detection light source 23 is located at a side of the detection light beam combining device 27, the outgoing light beam of the detection light source 23 is perpendicular to the outgoing light beam of the polarization beam combining device 26, and the outgoing light beam of the detection light source 23 and the image light beam outgoing from the polarization beam combining device 26 are coupled into an optical fiber 29 through a coupling lens 28 after being combined into one beam by the detection light beam combining device 27.

The utility model discloses in the scheme, the image light source includes two sets of

light sources

21, 22, every group light source includes R, G, B three kinds of luminescence units, two sets of light sources 21, the polarization state of the light beam of 22 outgoing is different, then, it restraints the photosynthetic bundle of device 26 with two sets of image light source outgoing to be a bunch of image light to

close device

24, 25 and polarization through the wavelength, the optical coupling optic fibre 29 after the image light sum detection photosynthesizes, thereby improve the total power of light source module, make it can satisfy the luminance requirement of fiber scanning imaging system in some high brightness scenes.

As shown in fig. 3A and 3B, for the schematic diagram of the polarization states of the two sets of light sources provided by the embodiment of the present invention, one set of the light beams emitted from the two sets of light sources is horizontally polarized, and the other set is vertically polarized. For example, the polarization direction of the light beam emitted from the light source 21 in the two groups of light sources is the horizontal direction, and the polarization direction of the light beam emitted from the light source 22 is the vertical direction, as shown in fig. 3A; alternatively, the polarization direction of the light beam emitted from the light source 21 is the vertical direction, and the polarization direction of the light beam emitted from the light source 22 is the horizontal direction, as shown in fig. 3B.

The embodiment of the present invention provides an embodiment, can realize the different polarization states of two sets of

light sources

21, 22 through following two kinds of modes, in practical application, not limited to following two kinds of modes.

In one possible embodiment, different polarization directions can be achieved by the installation direction. With reference to fig. 2, the light source module includes a base 30, the two groups of

light sources

21 and 22 are disposed on the base 30, the two groups of

light sources

21 and 22 are installed in different directions, and the installation direction of one group of light sources is rotated by 90 degrees around the light-emitting optical axis of the light source relative to the installation direction of the other group of light sources, so that the propagation directions of the light beams emitted from the two groups of

light sources

21 and 22 are parallel, and the polarization directions are perpendicular to each other.

In another possible implementation, the two sets of

light sources

21 and 22 do not need to rotate when being installed, and the polarization state of one set of light sources can be changed by adding a polarization state generating device, as shown in fig. 4, which is a schematic structural diagram of the polarization state generating device provided in the embodiments of the present invention. The light source module includes a polarization state generating device 31 disposed on an emergent light path of any one of the two groups of

light sources

21 and 22, and in fig. 4, the polarization state generating device 31 is disposed on the emergent light path of the light source 22. In practical applications, the polarization state generating device 31 may be a known polarization state generating device, for example, the polarization state generating device 31 may be a wave plate or a polarization retarder, such as a quarter-wave plate, capable of converting the polarization state of the light beam between two perpendicular polarization states; alternatively, the sheet may be a birefringent material, for example, a polymer film retarder (polymer film retarder), a birefringent crystal retarder (birefringent crystal retarder), a liquid crystal retarder (liquid crystal retarder), or a combination thereof.

The embodiment of the utility model provides an in, two sets of wavelengths

close beam devices

24, 25 and detect that the light beam closes beam device 27 and be wavelength division thin film filter, and two sets of wavelengths

close beam devices

24, 25 and detect that the light beam closes beam device 27 and corresponds 4 wavelengths by and pass through to close the beam to the light beam of two sets of

light sources

21, 22 outgoing, and close the beam to image light and detection light. The detection light source 23 may be an invisible light source, such as: may be an infrared light source. The detection light source 23 can be used for safety detection, image feedback and the like, and the utility model discloses do not limit this.

The embodiment of the utility model provides an in, the filter can fix or fix the bottom at base 30 with the ultraviolet glue with the thermosetting glue.

In the embodiment of the present invention, the polarization Beam combining device 26 can be a polarization Beam combiner pbc (polarization Beam combiner) for combining the beams emitted from the two sets of

light sources

21 and 22.

The embodiment of the utility model provides an in, polarization beam combiner PBC fixed stay, polarization beam combiner PBC is glued fixedly or is fixed with the ultraviolet glue with heat-cure between 30 with the base.

In the embodiment of the present invention, referring to fig. 2, the reflecting mirror 32 is located on the emergent light path of one of the wavelength combining devices 25, and the light emitted from one of the wavelength combining devices 25 is reflected by the reflecting mirror 32 and then turned by 90 degrees, and then enters from one side of the polarization combining device 26; the light exiting from the other set of wavelength combining devices 24 is incident directly from the other side of the polarization combining device 26.

In the embodiment of the present invention, the reflector 32 is fixed and supported, and the reflector 32 and the base 30 are fixed by thermal curing glue or ultraviolet glue.

In the embodiment of the present invention, the input light source is fixed on the sidewall of the base 30 by the way of solder sintering, so that there is no gap between the input light source and the base 30. The embodiment of the utility model provides an in, the TO pipe can be adopted TO the laser instrument, and the TO pipe is also known as coaxial encapsulation laser diode. When the laser is fixed with the base 30, the laser is sintered by using welding materials, no gap exists between the laser and the base 30, the heat dissipation is good, the laser is sintered on the base 30, the laser and the base 30 are not adjusted, the device stability is good, and the optical coupling efficiency is not influenced by laser welding.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.

Claims

1. An optical fiber coupling light source module, comprising:

2. The light source module as claimed in claim 1, wherein the polarization direction of the light beam emitted from one of the two light sources is horizontal, and the polarization direction of the light beam emitted from the other light source is vertical.

3. The light source module of claim 1, wherein the light source module comprises a base, the two sets of light sources are disposed on the base, and the two sets of light sources are installed in different directions, wherein the installation direction of one set of light sources is rotated by 90 degrees around the light-emitting optical axis of the light source relative to the installation direction of the other set of light sources, so that the propagation directions of the light beams emitted by the two sets of light sources are parallel and the polarization directions are perpendicular to each other.

4. The light source module of claim 1, wherein the light source module comprises a polarization state generator disposed on an outgoing light path of any one of the two light sources.

5. The light source module of claim 4, wherein the polarization state generator is a quarter-wave plate.

6. The light source module of claim 1, wherein the two wavelength combining devices and the detection beam combining device are all wavelength division thin film filters.

7. The light source module as claimed in claim 1, wherein the polarization beam combiner is a polarization beam combiner PBC.

8. The light source module as claimed in claim 1, wherein the detection light source is an infrared light source.

9. An optical fiber scanning imaging system, which is characterized by comprising the light source module and the light scanning module set as claimed in any one of claims 1 to 8, wherein light emitted by the light source module is scanned and output by the light scanning module set to be used as display image light; the optical scanning module comprises an actuator, an optical fiber in the light source module is fixed on the actuator, the optical fiber exceeds the actuator and forms an optical fiber cantilever, and the optical fiber cantilever is driven by the actuator to sweep in a three-dimensional space.