Light source module and scanning display device

Abstract

The utility model discloses a light source module and scanning display device, the light source module includes light source, coupling lens and tail fiber part, the tail fiber part includes optical fiber and optical fiber clamping structure, the optical fiber coupling end face is inclined end face, the light of light source emission is through the coupling lens, from the optical fiber coupling end face is coupled into the optical fiber, the tail fiber part with coupling lens separate setting, and the tail fiber part is relative to the coupling lens and is set to be inclined, make the optical axis of optical fiber and the optical axis of coupling lens coincide. In the scheme, through tail fiber part with coupling lens separate setting, the tail fiber part overall angle is adjustable, and the optical fiber light path (that is, the optical axis) and coupling lens optical axis coincide, and there is no eccentricity and defocus, make the coupling efficiency of optical fiber maximum, and tail fiber part processing precision requirement is low, and the volume is small, and the reliability is high, can satisfy the industrial production demand more.

Description

Technical Field

[0001] This utility model relates to the field of projection display, and in particular to a light source module and a scanning display device. Background Technology

[0002] The imaging principle of fiber optic scanning imaging technology is to modulate the light corresponding to each pixel of the image to be displayed by a light source, and then drive the scanning fiber to move at high frequency through a scanner to scan and output the light corresponding to each pixel, thereby projecting the light corresponding to each pixel of the image to be displayed onto the projection screen one by one to form a projected image.

[0003] Lasers possess advantages such as good monochromaticity, high brightness, and wide color gamut, and are often used as light sources for fiber optic scanning imaging. Image display is achieved by combining the light from R, G, and B color lasers. However, designing the light source structure to make the overall space more compact and meet the needs of industrial production is a problem that fiber optic scanning imaging technology needs to solve. Utility Model Content

[0004] The purpose of this invention is to provide a light source module and a scanning display device. This module has low processing precision requirements, small size, and high reliability, and can meet the needs of industrial production.

[0005] To achieve the above-mentioned utility model objectives, the first aspect of this utility model provides a light source module, including a light source, a coupling lens, and a pigtail component; the pigtail component includes an optical fiber and an optical fiber clamping structure, the coupling end face of the optical fiber is an inclined end face, and the light emitted from the light source is coupled into the optical fiber through the coupling lens; the pigtail component is separately disposed from the coupling lens, and the pigtail component is inclined relative to the coupling lens, such that the optical axis of the optical fiber and the optical axis of the coupling lens coincide.

[0006] Optionally, the fiber clamping structure includes a clamping structure body and a through hole for the fiber or ferrule to pass through.

[0007] Optionally, the end of the optical fiber is provided with a ferrule, the ferrule including a through hole for the optical fiber to pass through.

[0008] Optionally, the optical fiber protrudes from the ferrule end face.

[0009] Optionally, the fiber clamping structure is the housing of the light source module, and the housing is provided with through holes for the fiber to pass through.

[0010] Optionally, the fiber end is provided with a ferrule, the ferrule including a through hole for the fiber to pass through, and the end face of the ferrule is a flat end face.

[0011] Optionally, an optical positioning plate is provided between the fiber clamping structure and the bottom of the housing, and / or an optical positioning plate is provided between the coupling lens and the bottom of the housing.

[0012] The second aspect of this utility model provides a scanning display device, including a light source module and an optical fiber scanning module as described in the first aspect. The light emitted from the light source module is scanned and output by the optical fiber scanning module and used as display image light. The optical fiber scanning module includes an actuator. The light-emitting end of the optical fiber in the light source module is fixed on the actuator. The optical fiber extends beyond the actuator and forms an optical fiber cantilever. The optical fiber cantilever is driven by the actuator to sweep in space.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this embodiment of the invention, the pigtail component is separately disposed from the coupling lens. The overall angle of the pigtail component is adjustable. The optical path (i.e., optical axis) of the optical fiber output is coincident with the optical axis of the coupling lens, without eccentricity or defocus, which maximizes the coupling efficiency of the optical fiber. Furthermore, the pigtail component has low processing precision requirements, small size, and high reliability, which better meets the needs of industrial production. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram showing the positional relationship between the pigtail component and the coupling lens provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the light source module provided in an embodiment of the present utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the pigtail component provided in an embodiment of the present utility model;

[0019] Figure 4 This is a schematic diagram of another possible light source module provided in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The inventors of this invention discovered that, in order to reduce the unique stripe phenomenon in fiber optic scanning imaging, it is necessary to minimize the amount of echoes generated by device reflection and scattering that enter the laser. Therefore, when the laser is coupled into the fiber, the central ray deviates from the vertical direction and is incident on the fiber coupling end face. The solution is to place the fiber at an angle or use a beveled end face; generally, a beveled end face is a better echo cancellation solution. In traditional methods of assembly using mechanically precise shaft fits, to maximize coupling efficiency, the machining precision requirements for the beveled tail shank used to hold the fiber are extremely high, especially for large-angle beveled tail shanks, where the machining precision needs to be 1µm or even lower, resulting in extremely high manufacturing difficulty and cost. Therefore, in the solution of this invention, a separate compensation and adjustment method is used, which can greatly reduce costs.

[0022] Please refer to Figures 1-2 This utility model embodiment provides a light source module, including a light source 101, a coupling lens 102, and a pigtail component. The pigtail component includes an optical fiber 103 and an optical fiber clamping structure 104. The optical fiber coupling end face 105 of the optical fiber 103 is an inclined end face. Light emitted from the light source 101 passes through the coupling lens 102 and is coupled into the optical fiber 103 from the optical fiber coupling end face 105. The pigtail component is separately disposed from the coupling lens 102, and the pigtail component is placed at an inclination relative to the coupling lens 102, such that the optical axis of the optical fiber 103 coincides with the optical axis of the coupling lens 102. It should be understood that... Figure 1 The two dashed lines shown represent the optical axis of the optical fiber 103 and the optical axis of the coupling lens 102, respectively. The two optical axes are not aligned, but they can be aligned by adjusting the pigtail components.

[0023] In this embodiment of the invention, the way the fiber clamping structure 104 clamps and fixes the fiber 103 to form a pigtail component not only simplifies the machining accuracy requirements of clamping the fiber optic tail in traditional light source assembly schemes, but also allows for optical axis alignment between the fiber 103 and the coupling lens 102 by separating and adjusting the pigtail component and the coupling lens 102, even if the fiber 103 is cut at any angle according to actual needs. Furthermore, the use of a pigtail component simplifies the structural form, and the fiber clamping structure 104 can be compatible with structural forms with or without ceramic ferrules, effectively reducing costs.

[0024] Specifically, in the above solution, the overall angle of the pigtail component is adjustable. The positional relationship between the pigtail component and the coupling lens 102 can be tilted and adjusted according to the fiber optic cutting angle. The pigtail component and the coupling lens 102 are placed at an angle, so that the optical axis of the fiber optic 103 and the optical axis of the coupling lens 102 coincide, without eccentricity or defocus, maximizing optical coupling efficiency. Achieving optical axis alignment between the fiber optic 103 and the coupling lens 102 through separate adjustment avoids the need for mechanical processing precision to ensure optical axis alignment, thus avoiding the problems of extremely high difficulty and cost in mechanical processing.

[0025] In one possible implementation, such as Figure 3 As shown, the fiber optic clamping structure 104 includes a clamping structure body 1041 and a through hole 1042 for the fiber optic cable 103 or ferrule to pass through. The clamping structure body 1041 can be designed in a square, trapezoidal, or irregular shape, etc., according to actual needs, and this utility model does not limit this. The fiber optic end can be provided with a ferrule 106, which includes a through hole for the fiber optic cable to pass through. The fiber optic cable 103 can protrude from the end face of the ferrule 106, which can prevent stray light caused by light coupling into the glue used to bond the fiber optic cable, thereby preventing stray light from causing stripes and noise on the projected image. The fiber optic end can also be without a ferrule 106, and instead, the fiber optic cable 103 can be clamped and fixed by a fiber optic clamping structure 104 designed as needed to form a pigtail component. Similarly, without a ferrule, the fiber optic cable 103 can protrude from the end face of the fiber optic clamping structure 104, thereby preventing stray light caused by light coupling into the glue.

[0026] In this embodiment of the invention, for the optical fiber, the end face of the ferrule 106 or the end face of the optical fiber clamping structure 104 can both directly fix the optical fiber 103 and restrict its lateral displacement.

[0027] In this embodiment of the invention, the pigtail component and the coupling lens 102 can be height-positioned using an optical positioning plate. Then, the optical path alignment of the fiber optic cable 103 and the coupling lens 102 is achieved by tilting the pigtail component. This reduces the precision requirements for pigtail positioning height, making production easier and exponentially reducing production costs. In this embodiment, the optical positioning plate can be disposed between the bottom of the fiber clamping structure 104 and the bottom of the housing 107, or between the coupling lens 102 and the bottom of the housing 107, or both simultaneously. This invention does not impose any limitations on this.

[0028] The solution in this embodiment of the utility model also has the following advantages: the pigtail component is smaller and more compact; the device performance is more consistent; and the tail sealing is easier and more reliable.

[0029] In another possible implementation, such as Figure 4 As shown, a through hole for the optical fiber 103 to pass through can be provided on the housing 107, using the housing 107 as an optical fiber clamping structure. The pigtail is directly fixed to the housing 107, thus eliminating the need for additional mechanical optical fiber clamping components and saving costs. For the ferrule, a low-cost, high-precision flat-end ceramic ferrule can be used to clamp the optical fiber. The ceramic ferrule has high rigidity, is easy to operate, and is easy to fix. For the pigtail, the pigtail is directly fixed to the housing 107. The entire pigtail component has a compact structure and is easy to seal. The sealing method is not limited to bonding, glass powder sintering, etc. During the production process, the pigtail can be assembled with the housing 107 before cutting, eliminating the step of adjusting the optical fiber angle and making the production process more efficient.

[0030] In this embodiment of the invention, the light source can be a laser, such as a laser diode. The number of light sources shown in the accompanying drawings is for illustrative purposes only. This embodiment of the invention does not limit the type or number of light sources.

[0031] Based on the same inventive concept, this utility model embodiment also provides a scanning display device, including the light source module and fiber optic scanning module described in the above embodiments. The light emitted from the light source module is scanned and output by the scanning module to serve as the display image light. The fiber optic scanning module includes an actuator, with the light-emitting end of the fiber optic cable in the light source module fixed to the actuator. The fiber optic cable extends beyond the actuator to form a fiber optic cantilever, which is driven by the actuator to sweep in space. This scanning display device has advantages such as small size and easy installation, making it suitable for various projection devices and widely applicable.

[0032] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0033] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0034] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A light source module, characterized in that, It includes a light source, a coupling lens, and a pigtail component; the pigtail component includes an optical fiber and an optical fiber clamping structure, the optical fiber coupling end face is an inclined end face, the light emitted from the light source passes through the coupling lens and is coupled into the optical fiber from the optical fiber coupling end face; the pigtail component is separately disposed from the coupling lens, and the pigtail component is inclined relative to the coupling lens, so that the optical axis of the optical fiber and the optical axis of the coupling lens coincide.

2. The light source module as described in claim 1, characterized in that, The optical fiber clamping structure includes a clamping structure body and a through hole for the optical fiber or ferrule to pass through.

3. The light source module as described in claim 2, characterized in that, The fiber end is provided with a ferrule, the ferrule including a through hole for the fiber to pass through.

4. The light source module as described in claim 3, characterized in that, The optical fiber protrudes from the end face of the ferrule.

5. The light source module as described in claim 1, characterized in that, The optical fiber protrudes from the end face of the optical fiber clamping structure.

6. The light source module as described in claim 1, characterized in that, The optical fiber clamping structure is the housing of the light source module, and the housing is provided with through holes for the optical fiber to pass through.

7. The light source module as described in claim 5, characterized in that, The fiber end is provided with a ferrule, the ferrule includes a through hole for the fiber to pass through, and the end face of the ferrule is a flat end face.

8. The light source module as described in claim 1, characterized in that, An optical positioning plate is provided between the fiber clamping structure and the bottom of the housing of the light source module, and / or an optical positioning plate is provided between the coupling lens and the bottom of the housing of the light source module.

9. A scanning display device, characterized in that, Includes a light source module and an optical fiber scanning module as described in any one of claims 1-8, wherein the light emitted from the light source module is scanned and output by the optical fiber scanning module and used as display image light; The fiber scanning module includes an actuator. The light-emitting end of the fiber in the light source module is fixed on the actuator. The fiber extends beyond the actuator and forms a fiber cantilever. The fiber cantilever is driven by the actuator to sweep in space.

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