Light source module and optical fiber scanning display device

Abstract

The utility model discloses a light source module and an optical fiber scanning display device. The light source module comprises a light source; the tail fiber is arranged on an emergent light path of the light source; the tail fiber comprises an optical fiber fixing structure and an optical fiber; the optical fiber protrudes out of the end face of the optical fiber fixing structure, the end portion of the optical fiber comprises a stripe eliminating structure, and when light enters the stripe eliminating structure, the stripe eliminating structure can disperse reflected light formed by the end portion of the optical fiber. In the scheme, the optical fiber protrudes out of the end face of the insertion core, stray light caused by the fact that light is coupled into glue used for bonding the optical fiber can be avoided, the stripe eliminating structure can weaken reflected light at the end of the optical fiber, and then image stripes and noisy points caused by the fact that the stray light and the reflected light are transmitted backwards to enter a laser are avoided. Therefore, the technical problem that in the prior art, abnormal conditions such as stripes and noisy points of a certain rule can be formed on an image obtained through optical fiber scanning imaging, and the image quality is deteriorated is solved, and the technical effect of improving the imaging quality is achieved.

Description

Technical Field

[0001] This utility model relates to the field of projection display, and in particular to a light source module and a fiber optic 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 optical 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] Researchers discovered during the actual product development that images obtained by fiber optic scanning exhibit certain regular patterns of stripes, noise, and other anomalies, which degrade image quality. Utility Model Content

[0004] The purpose of this invention is to provide a light source module and a fiber optic scanning display device to solve the technical problem in the prior art where fiber optic scanning images will form certain regular stripes, noise and other abnormalities, which degrade the image quality.

[0005] To achieve the above-mentioned utility model objectives, the first aspect of this utility model provides a light source module applied in a fiber optic scanning display device. The light source module includes: a light source; a pigtail disposed in the light output path of the light source; the pigtail includes a fiber fixing structure and a fiber; the fiber protrudes from the end face of the fiber fixing structure; the end of the fiber includes an anti-striking structure, which can disperse the reflected light formed at the end of the fiber when light is incident on the anti-striking structure.

[0006] Optionally, the anti-striking structure includes an optical fiber coupling end face, which is a spherical surface.

[0007] Optionally, the spherical surface is symmetrically arranged with respect to the optical fiber axis.

[0008] Optionally, the anti-striking structure includes a spherical lens disposed at the end of the optical fiber.

[0009] Optionally, the optical fiber is a single-mode optical fiber or a few-mode optical fiber.

[0010] Optionally, the optical fiber fixing structure includes a ferrule, the ferrule having a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole, and the optical fiber protrudes from the end face of the ferrule.

[0011] Optionally, the optical fiber fixing structure includes a clamping structure body and a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the clamping structure body.

[0012] Optionally, the optical fiber is disposed on the surface of the optical fiber fixing structure; the optical fiber and the optical fiber fixing structure are bonded together by a curing adhesive.

[0013] Optionally, the optical fiber and the optical fiber fixing structure are bonded together with a curing adhesive; at least one section of the optical fiber near the optical fiber coupling end face is not covered by the curing adhesive.

[0014] A second aspect of this utility model provides a fiber optic scanning display device, comprising a light source module and a fiber optic scanning module as described in the first aspect. The light emitted from the light source module is scanned and output by the fiber optic scanning module to serve as display image light. The fiber optic scanning module includes an actuator, the light-emitting end of the fiber in the light source module is fixed to the actuator, the fiber extends beyond the actuator and forms a fiber cantilever, and the fiber cantilever is driven by the actuator to sweep in space.

[0015] One or more technical solutions in the embodiments of this utility model have at least the following technical effects or advantages:

[0016] In this embodiment of the invention, the optical fiber protrudes from the end face of the optical fiber fixing structure, and the end of the optical fiber includes an anti-striking structure. This can prevent stray light caused by the glue used to bond the optical fiber from being coupled into it, reduce the reflected light at the end of the optical fiber, and thus prevent stray light and reflected light from being propagated backward into the laser and causing image stripes and noise. This alleviates the technical problem in the prior art where regular stripes, noise and other abnormalities are formed on the image of optical fiber scanning imaging, which degrades the image quality. This achieves the technical effect of improving the image quality. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the optical path of the light source module provided in an embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of the pigtail provided in an embodiment of this utility model;

[0020] Figure 3 A schematic diagram showing an optical fiber end with a spherical lens provided in an embodiment of this utility model;

[0021] Figure 4A physical image showing an optical fiber with a spherical lens at its end, as provided in an embodiment of this utility model. Detailed Implementation

[0022] 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.

[0023] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the optical path of the light source module provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a pigtail provided in an embodiment of the present invention. The light source module includes a light source 101; a pigtail, disposed on the outgoing light path of the light source 101; the pigtail includes an optical fiber fixing structure 103 and an optical fiber 104; the optical fiber 104 protrudes from the end face 105 of the optical fiber fixing structure 103, and the end of the optical fiber includes an anti-striking structure 106, which, when light ( Figure 1 When light (as indicated by the arrow from right to left) is incident on the anti-striping structure 106, the anti-striping structure 106 can disperse the reflected light formed at the end of the optical fiber.

[0024] In this embodiment of the invention, the end face 105 of the fiber optic fixing structure 103 directly fixes the fiber optic cable 104 and restricts its lateral displacement. The fiber optic fixing structure 103 can be a ferrule, such as a ceramic ferrule or a ferrule made of other materials. The fiber optic fixing structure 103 can also be a fiber optic clamping structure, which includes a clamping structure body and a through hole for the fiber optic cable 104 to pass through. The fiber optic fixing structure 103 can also be a flat plate structure, and the fiber optic cable 104 can be disposed on the surface of the flat plate structure. The fiber optic cable 104 and the flat plate structure can be bonded together with a curing adhesive. In specific implementation, the fiber optic fixing structure 103 only needs to serve the function of fixing the fiber optic cable 104; the specific form of the fiber optic fixing structure 103 is not limited in this invention.

[0025] In this embodiment of the present invention, in order to increase the stability between the optical fiber fixing structure 103 and the optical fiber 104, a curing adhesive can be used to bond the optical fiber fixing structure 103 and the optical fiber 104. If the optical fiber 104 and the optical fiber fixing structure 103 are bonded together by the curing adhesive, at least one section of the optical fiber 104 near the end of the optical fiber will not be covered by the curing adhesive. In other words, at least one section of the optical fiber 104 near the end of the optical fiber will protrude from the curing adhesive used to fix the optical fiber 104.

[0026] In this embodiment of the present invention, the optical fiber 104 protrudes from the end face 105 of the optical fiber fixing structure 103, which can prevent stray light caused by light coupling into the glue used to bond the optical fiber. Furthermore, the anti-striping structure 106 can disperse the reflected light formed at the end of the optical fiber, thereby avoiding streaks and noise in the imaging caused by stray light and reflected light.

[0027] Next, the stripe-removing structure 106 in the embodiments of this utility model will be described.

[0028] In one possible implementation, please continue to refer to Figure 2 The anti-fringe structure 106 includes an optical fiber coupling end face, which is spherical. Forming the spherical surface of the optical fiber coupling end face through methods such as ablation can bring additional benefits, especially for single-mode and few-mode fibers. Spherical fibers have higher echo tolerance, and the spherical surface, symmetrical along the fiber axis, can achieve a good anti-fringe effect. This also means that the fiber does not need to be placed at an angle, reducing the difficulty of processing, positioning, and assembly. Furthermore, by matching the spherical parameters, an external coupling lens can be eliminated, saving costs, reducing adjustment steps, and reducing size. It should be noted that multimode fiber refers to fiber with more than or equal to three LP (Linearly Polarized) modes, single-mode fiber has only one stable transmission mode, and few-mode fiber contains two stable propagation modes.

[0029] In another possible implementation, such as Figure 3 and Figure 4 As shown, the anti-striping structure 106 is a spherical lens disposed at the end of the optical fiber. Generally speaking, the more fiber modes (the larger the fiber core size), the larger the cutting angle needs to be; the fewer fiber modes, the greater the angle compatibility. The cutting angle refers to the angled end face of the optical fiber coupling face. When the end of the optical fiber is a spherical end face or is equipped with a spherical lens, a good display effect can be achieved by using a cutting angle of 0 degrees combined with a spherical end face or a spherical lens. Of course, the optical fiber coupling end face can also be an angled end face; this invention does not limit this.

[0030] 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.

[0031] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0032] 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.

[0033] 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, used in a fiber optic scanning display device, characterized in that, The light source module includes: a light source; a pigtail disposed in the light output path of the light source; the pigtail includes an optical fiber fixing structure and an optical fiber; the optical fiber protrudes from the end face of the optical fiber fixing structure; the end of the optical fiber includes an anti-striping structure, which can disperse the reflected light formed at the end of the optical fiber when light is incident on the anti-striping structure.

2. The light source module as described in claim 1, characterized in that, The anti-stripping structure includes an optical fiber coupling end face, which is a spherical surface.

3. The light source module as described in claim 2, characterized in that, The spherical surface is symmetrically arranged with respect to the optical axis of the optical fiber.

4. The light source module as described in claim 1, characterized in that, The anti-striking structure includes a spherical lens disposed at the end of the optical fiber.

5. The light source module as described in claim 2 or 4, characterized in that, The optical fiber is a single-mode optical fiber or a few-mode optical fiber.

6. The light source module as described in claim 1, characterized in that, The optical fiber fixing structure includes a ferrule, the ferrule having a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the ferrule.

7. The light source module as described in claim 1, characterized in that, The optical fiber fixing structure includes a clamping structure body and a through hole for the optical fiber to pass through; the optical fiber is disposed in the through hole and protrudes from the end face of the clamping structure body.

8. The light source module as described in claim 1, characterized in that, The optical fiber is disposed on the surface of the optical fiber fixing structure; the optical fiber and the optical fiber fixing structure are bonded together by a curing adhesive.

9. The light source module as described in claim 1, characterized in that, The optical fiber and the optical fiber fixing structure are bonded together with a curing adhesive; at least one section of the optical fiber near the optical fiber coupling end face is not covered by the curing adhesive.

10. A fiber optic scanning display device, characterized in that, Includes a light source module and an optical fiber scanning module as described in any one of claims 1-9, 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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