CN113586998A

CN113586998A - Multi-wavelength LED uniform illumination light source

Info

Publication number: CN113586998A
Application number: CN202110917928.6A
Authority: CN
Inventors: 马恩
Original assignee: Xiamen Huimeijizhi Technology Co ltd
Current assignee: Xiamen Huimeijizhi Technology Co ltd
Priority date: 2021-08-11
Filing date: 2021-08-11
Publication date: 2021-11-02

Abstract

The invention provides a multi-wavelength LED uniform illumination light source which comprises a shell, a light condensation module, a light uniformizing module and a multi-path signal generator, wherein working pulse signals are supplied to an LED lamp bead through the multi-path signal generator, light emitted by the LED lamp bead is reflected by a parabolic reflector and converged on the front end surface of a light guide rod after being shaped into parallel light through a lens, light rays with various wavelengths are incident into the light guide rod and are emitted for multiple times, and uniform light spots are emitted from the rear end surface of the light guide rod. The multi-wavelength LED uniform illumination light source can realize high-efficiency light transmission and uniform multi-wavelength LED uniform illumination, has high energy utilization rate, can meet the requirements of more optical detection such as multicolor fluorescence microscopic imaging and the like, and has wide application prospect.

Description

Multi-wavelength LED uniform illumination light source

Technical Field

The invention discloses a multi-wavelength LED uniform illumination light source, belongs to the technical field of light measurement, and particularly relates to a light source for mixing LED lights with different wavelengths to perform efficient uniform illumination.

Background

In recent years, Light Emitting Diodes (LEDs) have been widely used in various fields such as illumination, medical treatment, scientific research, and military, because of their advantages such as high luminous efficiency, safe and stable luminous characteristics, small size, fast response, long life, and no pollution. With the progress of science and technology, the application of the LED light source in the field of spectrum testing is deepened gradually, and because the spectrum testing and the fluorescence detection are usually carried out on a sample by testing a plurality of wavelengths, and the single wavelength is detected in sequence, the testing time is long, and the oxidation, the deterioration and the like of a special sample along with the time are easily caused, so that the testing result is influenced. If the light with multiple wavelengths required by the test can be selectively mixed, the test can be carried out on the sample only once, which greatly shortens the test time and ensures the accuracy of the test result. However, the uniformity of the illumination of the mixed light source becomes a main factor affecting the detection result, for example, in multicolor fluorescence imaging, different fluorescent dyes are needed to mark the sample, and the fluorescence intensity distribution of the dyes under different wave band excitation illumination is monitored to complete the analysis of the component or microenvironment distribution of the mark sites, so that the excitation light needs to be homogenized in order to avoid the interference of the uniformity of the excitation light on the detection result. However, when the space light intensity of the LED which is distributed approximately like Lambert cosine is used for illumination directly, a round light spot with bright center and gradually darkened periphery is formed on a target surface, the uniformity is poor, and the uniformity of the light spot which is mixed with multi-wavelength LED light and output cannot meet the requirement of fluorescence imaging detection. Most of the existing commercial light-homogenizing components adopt reflection and diffusion inside an integrating sphere to realize light homogenization (such as labsphere company in the United states), the size and the volume of the integrating sphere device are large, the light intensity output after light is integrated inside the integrating sphere is attenuated, output light is a surface light source, and the like, so that multi-wavelength fluorescence illumination detection application, particularly multi-band high-light-efficiency integrated light-homogenizing illumination urgently needed by multicolor fluorescence microscopic imaging application, is inconvenient to realize. Therefore, in order to satisfy the application of LEDs in more spectral tests and fluorescence detection, especially in multicolor fluorescence microscopy, and to obtain a light source with a mixed and uniform multi-wavelength LED output illumination, and to improve energy utilization efficiency, it is urgently needed to design a multi-wavelength stable transient LED uniform illumination light source with a small size and capable of realizing efficient light transmission and light homogenization.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a multi-wavelength LED uniform illumination light source which can realize multi-wavelength LED uniform illumination with high-efficiency light transmission and light uniformization, has high energy utilization rate and can meet more optical detection requirements of multicolor fluorescence microscopic imaging and the like.

The invention provides a multi-wavelength LED uniform illumination light source which mainly comprises a shell, a light condensation module and a light homogenizing module. The shell comprises a light shield, a circuit board and a power supply connector, wherein the light shield is used for assembling and installing the light condensation module and the light homogenizing module and preventing external light from entering the interior to form stray light; the circuit board is used for orderly drawing power supply wires for supplying power to the LED lamp beads; and the power connector is arranged on the circuit board and used for connecting a power wire for supplying power to each LED lamp bead. The light condensing module comprises an LED mounting disc, LED lamp beads, a lens, a parabolic reflector and a reflector pressing ring, the LED mounting disc is mounted between the light shield and the circuit board, the LED lamp beads and the lens are used for emitting light with different wavelengths, and the lens is used for collecting and collimating the light emitted by the LED lamp beads; the parabolic reflector is mounted and pressed on the light shield through the reflector pressing ring and used for reflecting and converging the light collimated by the lens at the focus of the paraboloid. The even light module includes leaded light stick sleeve and leaded light stick, leaded light stick sleeve is installed on the LED mounting disc, leaded light stick is installed leaded light stick sleeve is last, the preceding terminal surface of leaded light stick is located parabolic reflector focus department for receive by the light of parabolic reflector transmission intersection in its focus, and follow the even light of rear end face output of leaded light stick, it is preferred, leaded light stick is the solid quartz stick of hexagonal. Light emitted by the LED lamp beads at each position on the LED mounting plate is collected and collimated into parallel light through the lens, reflected by the parabolic reflector, converged at the parabolic focus, received by the front end face of the light guide rod at the parabolic focus, and is uniformly output from the rear end face of the light guide rod after light rays with various wavelengths are totally reflected in the light guide rod for multiple times by utilizing the total internal reflection principle.

The invention has the beneficial effects that:

(1) the multi-wavelength LED uniform illumination light source disclosed by the invention is exquisite in design, small in size and compact in structure, the number of stations for mounting LED lamp beads on the LED mounting disc can be adjusted according to actual test requirements, the fewer the LED mounting stations are, the smaller the size of the multi-wavelength LED uniform illumination light source is, and the multi-wavelength LED uniform illumination light source can be applied to more small instruments.

(2) The LED lamp beads on the LED mounting plate are distributed in a circumferential mode, and emitted light can be converged at a parabolic focus position after being reflected by the parabolic reflector, is received by the front end face of the light guide rod positioned at the parabolic focus, and is incident to the light guide rod at the same angle.

(3) According to the multi-wavelength LED uniform illumination light source disclosed by the invention, light emitted by the LED lamp beads is collected and collimated through the lens, each light beam is reflected and converged at the focal position of the paraboloid by the parabolic reflector and is received by the front end face of the light guide rod, incident light is totally reflected in the solid light guide rod and finally emitted from the rear end face of the light guide rod, the energy loss is less, and the small-size and high-uniformity light output is realized.

Drawings

FIG. 1 is an external view of a multi-wavelength LED uniform illumination light source

FIG. 2 is a schematic view of an assembly of a multi-wavelength LED uniform illumination light source

FIG. 3 is a schematic view of LED lamp bead installation of a multi-wavelength LED uniform illumination light source

FIG. 4 is a schematic diagram of a uniform light path of a multi-wavelength LED uniform illumination light source

FIG. 5 is a Zemax software non-sequence simulation diagram of the illumination uniformity of the rear end face of a light guide rod of a multi-wavelength LED uniform illumination light source

In the figure: 1. a light shield; 2, LED mounting plate; 3. a circuit board; 4. a power supply connector; 5. a light guide rod sleeve; 6. a reflector clamping ring; 7. a parabolic reflector; 8. a lens; 9, LED lamp beads; 10. light guide rod

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the following examples are only illustrative and explanatory of the present invention and should not be construed as limiting the scope of the present invention. All the technologies realized based on the above-mentioned contents of the present invention are covered in the protection scope of the present invention.

The invention provides a multi-wavelength LED uniform illumination light source which mainly comprises a shell, a light condensation module and a light homogenizing module. The shell comprises a light shield 1, a circuit board 3 and a power connector 4, wherein the light shield 1 is used for assembling and installing the light condensation module and the light homogenizing module and preventing external light from entering the interior to form stray light; the circuit board 3 is used for orderly drawing in power supply wires for supplying power to the LED lamp beads 9; and the power connector 4 is arranged on the circuit board 3 and is used for connecting a power wire for supplying power to each LED lamp bead 9. The light condensation module comprises an LED mounting disc 2, LED lamp beads 9, a lens 8, a parabolic reflector 7 and a reflector clamping ring 6, the LED mounting disc 2 is mounted between the light shield 1 and the circuit board 3 and used for mounting the LED lamp beads 9 and the lens 8, the LED lamp beads 9 are used for emitting light with different wavelengths, and the lens 8 is used for collecting and collimating the light emitted by the LED lamp beads 9; the parabolic reflector 7 is mounted and pressed on the light shield 1 through the reflector clamping ring 6, and is used for reflecting and converging the light collimated by the lens 8 at a parabolic focus. Even light module includes leaded light stick 10 sleeve 5 and leaded light stick 10, leaded light stick 10 sleeve 5 is installed on the LED mounting disc 2, leaded light stick 10 is installed on leaded light stick 10 sleeve 5, the preceding terminal surface of leaded light stick 10 is located parabolic reflector 7 focus department for receive by parabolic reflector 7 transmission meets in the light of its focus, and follow the even light of rear end face output of leaded light stick 10, it is preferred, leaded light stick 10 is the solid quartz stick of hexagonal. Light emitted by the LED lamp beads 9 at each position on the LED mounting disk 2 is collected and collimated into parallel light through the lens 8, then reflected by the parabolic reflector 7 to intersect at the parabolic focus, and received by the front end face of the light guide rod 10 at the parabolic focus, and light rays with each wavelength are reflected for multiple times in the light guide rod 10 and then output uniform light from the rear end face of the light guide rod 10.

During operation, the LED lamp beads 9 with the proper wavelengths are selected and powered according to practical application requirements, light emitted by the LED lamp beads 9 is collected and collimated into parallel light through the lens 8, then the parallel light is reflected by the parabolic reflector 7 and converged at the parabolic focal point position, the parallel light is received by the front end face of the light guide rod 10 located at the parabolic focal point, and after the light is emitted for multiple times in the light guide rod 10, uniform light spots are emitted from the rear end face of the light guide rod 10, as shown in fig. 4 and 5.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The multi-wavelength LED uniform illumination light source is characterized by mainly comprising a shell, a light condensation module and a light homogenizing module. The shell comprises a light shield, a circuit board and a power connector, and the power connector is mounted on the circuit board; the light condensation module comprises an LED mounting disc, an LED lamp bead, a lens, a parabolic reflector and a reflector pressing ring, the LED mounting disc is mounted between the light shield and the circuit board, and the parabolic reflector is mounted and pressed on the light shield through the reflector pressing ring; the light homogenizing module comprises a light guide rod sleeve and a light guide rod, the light guide rod sleeve is installed on the LED installation plate, and the light guide rod is installed on the light guide rod sleeve.

2. The multi-wavelength LED uniform illumination light source as claimed in claim 1, wherein the light emitted from the LED lamp beads is collected and shaped into parallel light by the lens, and then is reflected by the parabolic reflector to converge at the parabolic focus.

3. The multiwavelength LED uniform illumination source of claim 2, wherein said light guide rod front face is located at said parabolic focus, and wherein said light beam converging at said parabolic focus is received by said light guide rod.