A high color rendering index laser white light module

Abstract

This invention discloses a high color rendering index (CRI) laser white light module. The high CRI laser white light module includes: a laser group, a deflection optical path group, a coupling lens device, a homogenizing fiber, and a transmissive fluorescent device arranged sequentially along the optical axis. The laser group provides multiple colors of emitted light. The coupling lens device couples the multiple colors of emitted light to the incident end of the homogenizing fiber. The homogenizing fiber homogenizes the multiple colors of emitted light. The transmissive fluorescent device is located adjacent to the emitting end of the homogenizing fiber. One or more wavelengths of the multiple colors of emitted light excite and convert the fluorescent material of the transmissive fluorescent device, and mix with the remaining unexcited and unconverted emitted light to obtain white light output. The beneficial effect of this invention is that it provides high CRI white light.

Description

Technical Field

[0001] This invention relates to laser lighting, and more particularly, to a high color rendering index laser white light module. Background Technology

[0002] With the development of semiconductor technology, research on lighting devices based on light-emitting diodes (LEDs) and semiconductor lasers has flourished. White laser light sources generated by semiconductor laser-excited fluorescent devices have become a research hotspot both domestically and internationally due to their ultra-high brightness, ultra-long illumination distance, and long lifespan, making them a promising candidate for high-brightness lighting. In existing white laser modules, the common approach involves using a blue laser to excite a fluorescent device to generate yellow light, which is then mixed with some of the existing blue light to form white light. However, this method is inherently limited by the development level of fluorescent devices, resulting in a low color rendering index (CRI), generally below 70, with a few exceptions slightly above 70. Furthermore, its R9 value is very low. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of low color rendering index in existing laser white light sources and to provide a high color rendering index laser white light module.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a high color rendering index laser white light module, comprising: a laser group, a deflection optical path group, a coupling lens device, a homogenizing optical fiber, and a transmissive fluorescent device arranged sequentially along the optical axis; wherein, the laser group is used to provide multiple colors of emitted light, the coupling lens device is used to couple the multiple colors of emitted light to the incident end of the homogenizing optical fiber, the homogenizing optical fiber is used to homogenize the multiple colors of emitted light, the transmissive fluorescent device is in close contact with the emitting end of the homogenizing optical fiber, one or more wavelengths of the multiple colors of emitted light excite and convert the fluorescent material of the transmissive fluorescent device, and mix with the remaining unexcited and unconverted emitted light to obtain white light output.

[0005] As a preferred embodiment of a high color rendering index laser white light module, the laser array consists of lasers arranged in an array, each of which emits light of a single color.

[0006] As a preferred embodiment of a high color rendering index laser white light module, the emitted light of the various colors is selected from the following: blue light with a main wavelength of 440-470nm, green light with a main wavelength of 500-535nm, red light with a main wavelength of 630-650nm, violet light with a main wavelength of 380-420nm, cyan light with a main wavelength of 480-500nm, and deep red light with a main wavelength of 650-700nm.

[0007] As a preferred embodiment of a high color rendering index laser white light module, the deflection optical path group consists of an array of deflection optical paths, which are used to bring the light emitted by the laser from positions other than the optical axis closer to or nearly closer to the optical axis.

[0008] As a preferred embodiment of a high color rendering index laser white light module, the deflection optical path includes: a first reflector and a second reflector used in conjunction, the laser being on the incident side of the first reflector, and the coupling lens being on the exiting side of the second reflector. The second reflector is closer to the optical axis than the first reflector, such that the light emitted from the laser to the first reflector is farther from the optical axis, while the light emitted from the second reflector to the coupling device is closer to the optical axis.

[0009] As a preferred embodiment of a high color rendering index laser white light module, the aforementioned turning optical path group is omitted.

[0010] As a preferred option for a high color rendering index laser white light module, the uniform optical fiber is replaced by a non-bendable uniform optical device.

[0011] As a preferred embodiment of a high color rendering index laser white light module, the fluorescent material of the transmissive fluorescent device includes a variety of fluorescent materials with different excitation spectra.

[0012] As a preferred embodiment of a high color rendering index laser white light module, the multiple colors of emitted light include: red light with a dominant wavelength of 630-650nm and / or deep red light with a dominant wavelength of 650-700nm, and the multiple fluorescent materials with different excitation spectra include: germanate fluorescent materials.

[0013] Compared with the prior art, the beneficial effects of the present invention are at least as follows: it is used to provide white light with a high color rendering index. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0015] Figure 2 This is a schematic diagram of the optical path according to an embodiment of the present invention.

[0016] Serial number: 1. Laser group; 2. Bending optical path group; 3. Coupled lens device; 4. Uniform optical fiber; 5. Transmissive phosphor. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. It should be noted that these descriptions of embodiments are intended to aid in understanding the invention and do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0018] See Figure 1 The figure shows a high color rendering index (CRI) laser white light module. The high CRI laser white light module includes: a laser group, a deflection optical path group, a coupling lens device, a homogenizing fiber, and a transmissive fluorescent device. The laser group, the deflection optical path group, the coupling lens device, the homogenizing fiber, and the transmissive fluorescent device are arranged sequentially along the optical axis.

[0019] The laser array consists of lasers arranged in an array. Each laser emits a single color of light, while the laser array emits multiple colors of light. Specifically, the multiple colors of light are selected from the following: blue light with a dominant wavelength of 440-470nm, green light with a dominant wavelength of 500-535nm, red light with a dominant wavelength of 630-650nm, violet light with a dominant wavelength of 380-420nm, cyan light with a dominant wavelength of 480-500nm, deep red light with a dominant wavelength of 650-700nm, or others. The specific selection of the light source and the power ratio need to be determined by comprehensive calculation based on the required color temperature, color rendering index, and fluorescence conversion rate. Specifically, the array arrangement is not limited to a matrix or circular regular array; an irregular array can also be used.

[0020] The deflection optical path group consists of an array of deflection optical paths. These deflection optical paths are used to bring the light emitted from the laser located off-axis towards the optical axis, either parallel or nearly parallel, thereby compacting the multi-color light emitted to the coupling lens device. Specifically, the deflection optical path includes a first reflecting mirror and a second reflecting mirror used in conjunction. The laser is located on the incident side of the first reflecting mirror, while the coupling lens is located on the exit side of the second reflecting mirror. The second reflecting mirror is closer to the optical axis than the first reflecting mirror, such that the light emitted from the laser reaching the first reflecting mirror is farther from the optical axis, while the light emitted from the second reflecting mirror reaching the coupling device is closer to the optical axis.

[0021] In other embodiments, if the number of lasers in the laser group is small, or the lasers in the laser group are already compactly arranged, or the laser group does not have high requirements for compactness, the turning optical path group can be omitted.

[0022] The coupling lens device is used to couple the emitted light of the various colors to the incident end of the uniform optical fiber. In specific implementations, the coupling lens device can be a single lens or a lens group composed of single lenses. The single lens is a spherical lens or an aspherical lens.

[0023] The homogenizing fiber is used to homogenize the emitted light of the multiple colors and send it to the transmissive fluorescent device. In specific implementations, the homogenizing fiber can be a fiber with a smaller core diameter, in which case the fiber needs to be wound at least one full turn.

[0024] In other embodiments, the uniform optical fiber can be replaced by other inflexible uniform optical devices. Specifically, the cross-section of the uniform optical fiber is square, hexagonal, circular, or other shapes.

[0025] The transmissive fluorescent device is positioned close to the emitting end of the uniform optical fiber. One or more wavelengths of the emitted light of various colors can excite the fluorescent material of the transmissive fluorescent device, resulting in one or more broadband superimposed wavelengths. These wavelengths are then mixed with the remaining unexcited and unconverted emitted light to produce white light output. Specifically, the fluorescent material of the transmissive fluorescent device includes multiple fluorescent materials with different excitation spectra (e.g., a mixture of green, yellow, and red phosphors). The specific types and proportions of fluorescent substances are determined through comprehensive calculation based on the required color temperature, color rendering index, and fluorescence conversion efficiency.

[0026] See Figure 2 The figure shows the light paths of the various colors of light emitted.

[0027] Verification has shown that the white light obtained from the high color rendering index laser white light module has an Ra ≥ 90, or even Ra ≥ 95. If the emitted light of the multiple colors includes: red light with a dominant wavelength of 630-650nm and / or deep red light with a dominant wavelength of 650-700nm, and the fluorescent materials with the multiple different excitation spectra are germanates, then R9 ≥ 85, or even R9 ≥ 90, can be further achieved.

[0028] The above description merely illustrates embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A high color rendering index laser white light module, characterized in that, include: A laser group, a deflection optical path group, a coupling lens device, a homogenizing fiber, and a transmissive fluorescent device are arranged sequentially along the optical axis. The laser group provides multiple colors of emitted light. The coupling lens device couples the multiple colors of emitted light to the incident end of the homogenizing fiber. The homogenizing fiber homogenizes the multiple colors of emitted light. The transmissive fluorescent device is located close to the emitting end of the homogenizing fiber. One or more wavelengths of the multiple colors of emitted light excite and convert the fluorescent material of the transmissive fluorescent device, and mix with the remaining unexcited and unconverted emitted light to obtain white light output. 2.The high color rendering index laser white light module of claim 1, wherein, The laser array consists of lasers arranged in an array, each laser emitting light of a single color. 3.The high color rendering index laser white light module of claim 2, wherein, The emitted light of the various colors is selected from the following: blue light with a main wavelength of 440-470nm, green light with a main wavelength of 500-535nm, red light with a main wavelength of 630-650nm, violet light with a main wavelength of 380-420nm, cyan light with a main wavelength of 480-500nm, and deep red light with a main wavelength of 650-700nm. 4.The high color rendering index laser white light module of claim 1, wherein, The deflection optical path group consists of an array of deflection optical paths, which are used to bring the light emitted by the laser that is not located on the optical axis closer to or nearly closer to the optical axis. 5.The high color rendering index laser white light module of claim 4, wherein, The deflection optical path includes a first reflector and a second reflector used in conjunction, with the laser on the incident side of the first reflector and the coupling lens on the exit side of the second reflector. The second reflector is closer to the optical axis than the first reflector, such that the light emitted from the laser to the first reflector is farther from the optical axis, while the light emitted from the second reflector to the coupling device is closer to the optical axis. 6.The high color rendering index laser white light module of claim 1, wherein, The aforementioned turning optical path group is omitted. 7.The high color rendering index laser white light module of claim 1, wherein, The uniform optical fiber is replaced with a non-bendable uniform optical device.

8. The high color rendering index laser white light module according to claim 1, characterized in that, The fluorescent materials of the transmission fluorescent device include: fluorescent materials with different excitation spectra.

9. The high color rendering index laser white light module according to claim 8, characterized in that, The emitted light of the various colors includes: red light with a dominant wavelength of 630-650nm and / or deep red light with a dominant wavelength of 650-700nm, and the fluorescent materials with the various excitation spectra include: germanate fluorescent materials.

Images