CN218671672U

CN218671672U - Multi-channel LED beam combining light source

Info

Publication number: CN218671672U
Application number: CN202223183474.3U
Authority: CN
Inventors: 王聪; 唐鹏桢; 牛明宇; 王超; 刘聪; 魏文娟
Original assignee: Autobio Labtec Instruments Zhengzhou Co Ltd
Current assignee: Autobio Labtec Instruments Zhengzhou Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-03-21
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a multichannel LED beam combining light source, include: a plurality of single color LEDs; the light source collimation coupling modules are arranged corresponding to the monochromatic LEDs, each light source collimation coupling module comprises a collimation lens, an attenuation sheet and a coupling lens which are sequentially arranged along the light transmission direction, and parallel light output by the collimation lens is mutually vertical to the attenuation sheet; the optical fiber beam splitter is provided with an input end and an output end, and the input end and the coupling lens are respectively arranged correspondingly; the optical fiber beam combining head is correspondingly arranged at the output end of the optical fiber beam splitter and is used for outputting combined light containing all the wavelengths of the monochromatic LED light sources; the central wavelength of the monochromatic LEDs is 340-850nm, the divergence angle of each monochromatic LED is smaller than 60 degrees, and the numerical aperture of each collimating lens is larger than 0.5. The utility model discloses a mode of one minute of many optical fibers and coupling lens combination realizes closing the operation of restrainting to a plurality of monochromatic LEDs, and whole no unnecessary heat radiation structure can be applied to scenes such as fluorescence detection, microscope light source.

Description

Multi-channel LED beam combining light source

Technical Field

The utility model belongs to the technical field of the LED lighting technology and specifically relates to a multichannel LED beam combination light source is related to.

Background

The light sources commonly used by various instruments are mainly white light LEDs, single-color LEDs and halogen lamps, and the light sources have the following defects when being used independently: the white light LED has uneven intensity distribution in different wavelengths in the visible light range, and weak light intensity in near ultraviolet/near infrared wavelength; the single-color LED has a narrow working wavelength range, and a single LED is not suitable for a scene with a wide working wavelength range requirement; the halogen lamp has uneven intensity distribution in different wavelengths in the visible light range, short service life and more generated heat, and a special heat dissipation structure needs to be built for heat dissipation. Therefore, for scenes with wide operating wavelength range requirements, different monochromatic LEDs are often combined to build a light source system meeting the requirements.

The dichroic mirror has the functions of filtering, splitting, combining and the like, and a single dichroic mirror can converge light beams which are emitted by monochromatic LEDs with different wavelengths and transmitted along mutually vertical directions together so as to transmit the light beams along the same direction; when 2-3 dichroic mirrors with different specifications are used and fixed with the LEDs in a certain sequence, the beam combination of 3-4 monochromatic LEDs can be realized. Obviously, multiple dichroic mirrors are needed for combining multiple colors, which is too high in cost; secondly, when the scheme is adopted for construction, the LEDs need to be fixed in sequence according to the wavelength, so that the problems of large transmission loss of long-wave or short-wave LEDs and poor uniformity of LED combined light sources exist; third, the transmittance/reflectance of dichroic mirrors currently on the market is generally 80% -90%, and when a plurality of dichroic mirrors are used, the light loss is large, so that the number of combined LEDs in the scheme is limited.

Disclosure of Invention

In order to solve the problem, the utility model provides a long-life, wide, the homogeneity of wavelength range is good, with low costs multichannel LED beam combining light source specifically can take following technical scheme:

multichannel LED beam combining light source, include

A plurality of single color LEDs;

the light source collimation coupling modules are arranged corresponding to the monochromatic LEDs, each light source collimation coupling module comprises a collimation lens, an attenuation sheet and a coupling lens which are sequentially arranged along the light transmission direction, and parallel light output by the collimation lens is mutually vertical to the attenuation sheet;

the optical fiber beam splitter is provided with an input end and an output end, and the input end and the coupling lens are respectively arranged correspondingly;

the optical fiber beam combining head is correspondingly arranged at the output end of the optical fiber beam splitter and is used for outputting combined light containing all wavelengths of the monochromatic LED light sources;

the central wavelength of the monochromatic LEDs is 340-850nm, the divergence angle of each monochromatic LED is smaller than 60 degrees, and the numerical aperture of each collimating lens is larger than 0.5 so as to avoid energy loss in the collimating process.

The monochromatic LEDs are divergently transmitted at a certain angle and respectively pass through the corresponding light source collimation coupling modules, wherein the divergent LED light beams are collimated into parallel light beams by the collimation lenses, the parallel light beams vertically pass through the attenuation sheet and then reach the coupling lenses, the parallel light beams are converged and coupled to the optical fiber beam splitter by the coupling lenses, the received LED light beams are converged to the optical fiber beam combining head by the optical fiber beam splitter, and combined light beams containing all monochromatic LED light source wavelengths are formed.

Preferably, the number of the single-color LEDs is six, the central wavelengths of the six single-color LEDs are 340nm, 405nm, 575nm, 660nm, 800nm and 850nm, and the attenuation sheets corresponding to the single-color LEDs with the central wavelengths of the six single-color LEDs are 50% attenuation sheets.

Preferably, the numerical aperture of the coupling lens is smaller than that of the optical fiber bundle in the optical fiber beam splitter, so as to avoid energy loss during the coupling process.

In order to keep the transmission efficiency high, the collimating lens, the attenuation sheet, the coupling lens, the optical fiber beam splitter and the optical fiber beam combining head are all made of fused silica.

The utility model provides a multichannel LED closes a beam light source, simple structure, the equipment of being convenient for, it does not use the dichroic mirror, through the mode of a minute optical fiber and coupling lens combination, realizes closing the operation of restrainting to a plurality of monochromatic LEDs, and whole no unnecessary heat radiation structure can guarantee the light source life-span, can also export the monochromatic beam light that closes that the homogeneity is better, the working wavelength scope is wider, can be applied to scenes such as fluorescence detection, microscope light source.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the light source collimating and coupling module in fig. 1.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings, and the present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation and specific construction process, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 and 2, the multi-channel LED combined light source of the present invention comprises a plurality of monochromatic LED light sources 1 with central wavelengths of 340-850nm, a light source collimation coupling module 2 is disposed at the rear side of each monochromatic LED light source 1, each light source collimation coupling module 2 comprises a collimating lens 21, an attenuation sheet 22 and a coupling lens 23 sequentially disposed along the light transmission direction, and the parallel light output by the collimating lens 21 is perpendicular to the attenuation sheets 22 of the same group; the rear side of the coupling lens 23 is provided with an optical fiber beam splitter 3 (Nanjing Sheng, model 1-10-525), the optical fiber beam splitter 3 is provided with an input end and an output end, the input end of the optical fiber beam splitter corresponds to the coupling lens 23 respectively, and the output end of the optical fiber beam splitter is converged at the optical fiber beam combining head 4, so that all the monochromatic LED light sources 1 form combined light under the action of the optical fiber beam combining head 4.

In this embodiment, the number of the monochromatic LED light sources 1 is six, the central wavelengths thereof are 340nm, 405nm, 575nm, 660nm, 800nm, and 850nm, and the wavelength bands thereof cover near ultraviolet, visible light, and partial near infrared, which can satisfy most application scenarios. The divergence angle of each monochromatic LED light source 1 is less than 60 °, and the numerical aperture of each collimating lens 21 is greater than 0.5, so as to avoid energy loss during collimation. Because the light intensity of 575nm and 660nm LEDs is too high, the light intensity of the two LEDs is attenuated to be close to that of the rest LEDs by adopting the 50% attenuation sheet 22, so that the uniformity of the light intensity of each wavelength in the whole light source system is ensured. Further, in order to couple all the parallel light beams into the optical fiber bundle of the optical fiber splitter 3 by the coupling lens 23 and avoid energy loss during the coupling process, the numerical aperture of the coupling lens 23 should be smaller than the numerical aperture of the optical fiber bundle in the optical fiber splitter 3, so that the optical fiber transmission should satisfy the total reflection condition. Because the six monochromatic LED light sources 1 have a near ultraviolet light source with a wavelength of 340nm, the collimating lens 21, the attenuating plate 22, the coupling lens 23, the optical fiber bundle of the optical fiber beam splitter 3 and the optical fiber beam combining head 4 are all made of fused silica, so that the light beam with the wavelength of 340nm has higher transmission efficiency in the system.

When the device works, each monochromatic LED light source 1 is diverged and transmitted at a certain angle and respectively passes through the corresponding light source collimation coupling modules, wherein the divergent LED light beams are collimated into parallel light beams by the collimation lens 21, the parallel light beams vertically pass through the attenuation sheet 22 and then reach the coupling lens 23, the parallel light beams are converged and coupled to the optical fiber beam splitter 3 by the coupling lens 23, and the received LED light beams are converged to the optical fiber beam combining head 4 by the optical fiber beam splitter 3 to form combined light beams containing all monochromatic LED light source wavelengths.

The utility model discloses can realize closing the operation of restrainting to a plurality of LEDs, make this light source have the working wavelength range and the homogeneity of broad, and this light source does not use dichroic mirror, need not to consider the heat dissipation, and overall cost is lower.

It should be noted that in the description of the present invention, terms of orientation or positional relationship such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Claims

1. A multichannel LED beam combining light source is characterized in that: comprises that

A plurality of single color LEDs;

the central wavelength of the monochromatic LEDs is 340-850nm, the divergence angle of each monochromatic LED is smaller than 60 degrees, and the numerical aperture of each collimating lens is larger than 0.5.

2. The multi-channel LED combined beam source of claim 1, wherein: the number of the single-color LEDs is six, the central wavelengths of the six single-color LEDs are 340nm, 405nm, 575nm, 660nm, 800nm and 850nm respectively, and the attenuation sheets corresponding to the single-color LEDs with the central wavelengths of 575nm and 660nm are 50% attenuation sheets.

3. The multi-channel LED combined beam source of claim 1, wherein: the numerical aperture of the coupling lens is smaller than that of the optical fiber bundle in the optical fiber beam splitter.

4. The multi-channel LED combined beam source of claim 1, wherein: the collimating lens, the attenuation sheet, the coupling lens, the optical fiber beam splitter and the optical fiber beam combining head are all made of fused quartz.