Light source device

Abstract

The present invention provides a light source device. The light source device includes: a housing; a light source substrate disposed within the housing; a light source structure disposed on the light source substrate; a light guiding structure disposed on the light-emitting side of the light source structure, and a surface of the light guiding structure away from the light source structure is a light-emitting surface, the light-emitting surface is composed of a raised surface segment and at least two flat surface segments, and there is at least one flat surface segment on each side of the raised surface segment, and the flat surface segments are parallel to the light source substrate. The present invention solves the problem of light brightness difference existing in the light source device in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of image sensing devices, and more particularly, to a light source device. Background Art

[0002] With the development of technology and the continuous progress of society, the industrial intelligent development shows an explosive growth momentum. In the field of machine vision, the way of simulating biological vision to image and process information helps robots extract, process and understand the extracted information, so as to enable them to perform automated operations accurately, efficiently and safely. The importance of machine vision is mainly reflected in: guiding and positioning, appearance inspection, high-precision monitoring and image recognition. Among them, the light source device is an essential component in visual inspection. When detecting bar-code-shaped items or strip-shaped items, it is usually necessary to use a light source device to perform light filling treatment on the item to be detected. The existing light source devices still have problems such as insufficient light source brightness and low light flux utilization rate.

[0003] That is to say, the light source device in the prior art has the problem of poor light brightness. Summary of the Invention

[0004] The main object of the present invention is to provide a light source device to solve the problem of poor light brightness of the light source device in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a light source device, including: a frame body; a light source substrate disposed in the frame body; a light source structure disposed on the light source substrate; a light guide structure disposed on the light-emitting side of the light source structure, a surface of the light guide structure away from the light source structure being a light-emitting surface, the light-emitting surface being composed of a raised surface segment and at least two flat surface segments, and there being at least one flat surface segment on each side of the raised surface segment, the flat surface segments being parallel to the light source substrate.

[0006] Further, the light source structure includes a plurality of LEDs arranged at intervals along a straight line, the light guide structure is strip-shaped, the extending direction of the strip-shaped light guide structure is the same as the arrangement direction of the plurality of LEDs, and the light guide structure is symmetrically arranged with respect to the optical axis of the light source structure.

[0007] Further, the distances between at least two flat surface segments and the light source substrate are equal, so that at least two flat surface segments are at the same height.

[0008] Further, the flat surface segments include a first flat surface segment, a second flat surface segment, a third flat surface segment and a fourth flat surface segment, a surface of the light guide structure away from the light source structure further includes a first transition surface segment connecting the first flat surface segment and the second flat surface segment and a second transition surface segment connecting the third flat surface segment and the fourth flat surface segment, wherein the second flat surface segment and the third flat surface segment are connected to the raised surface segment.

[0009] Furthermore, the distances between the first planar segment and the fourth planar segment and the light source substrate are equal respectively; and / or the distances between the second planar segment and the third planar segment and the light source substrate are equal respectively; and / or the distance between the first planar segment and the light source substrate is greater than the distance between the second planar segment and the light source substrate.

[0010] Furthermore, the width of the first planar segment is greater than the width of the second planar segment.

[0011] Furthermore, the raised surface segment is an arc surface segment.

[0012] Furthermore, the raised surface segment includes a combined surface segment composed of an arc surface segment and straight surface segments. Among them, there are multiple straight surface segments, and the multiple straight surface segments are symmetrically arranged on both sides of the arc surface segment respectively, and the multiple straight surface segments on the same side are arranged at an angle.

[0013] Furthermore, the radius of curvature of the arc surface segment is greater than or equal to 4.4 mm and less than or equal to 4.6 mm.

[0014] Furthermore, one side surface of the light guide structure facing the light source structure has a recessed portion. The recessed portion forms a receiving cavity for receiving the light source structure. The recessed portion has a light incident surface, and the light incident surface is an arc surface.

[0015] Furthermore, the light guide structure further includes a lateral connection surface connecting the light exit surface and the light incident surface. The lateral connection surface is composed of multiple surface segments continuously arranged along a curve direction. An angle is provided between adjacent two surface segments, and the surface segments are planar.

[0016] Furthermore, the light source device further includes a heat dissipation structure. The heat dissipation structure is arranged on the housing and is located on the backlight side of the light source structure. The heat dissipation structure includes one of a heat sink and a fan.

[0017] Applying the technical solution of the present invention, the light source device includes a housing, a light source substrate, a light source structure, and a light guide structure. The light source substrate is arranged in the housing; the light source structure is arranged on the light source substrate; the light guide structure is arranged on the light exit side of the light source structure. One side surface of the light guide structure away from the light source structure is a light exit surface. The light exit surface is composed of a raised surface segment and at least two planar segments, and there is at least one planar segment on both sides of the raised surface segment. The planar segments are parallel to the light source substrate.

[0018] By providing a housing, the housing provides an installation position for the light source substrate, the light source structure, and the light guiding structure, improving the reliability of use of the light source substrate, the light source structure, and the light guiding structure, and ensuring that the light source structure can operate stably. By arranging the light source structure on the light source substrate, the light source substrate can provide a circuit for the light source structure, and at the same time, the light source substrate can also accelerate the heat dissipation of the light source structure to protect the light source structure, ensuring the stability and safety of the operation of the light source structure and ensuring that the light source structure can emit light stably. By providing a light guiding structure, the light guiding structure plays a role in condensing light, enabling the light guiding structure to converge the light emitting angle of the light source structure, thereby achieving the effect of condensing light to increase brightness, effectively increasing the light brightness, and improving the utilization rate of luminous flux. The light emitting surface is composed of a raised surface section and at least two flat surface sections. There is at least one flat surface section on each side of the raised surface section. The flat surface sections are parallel to the light source substrate. By reasonably planning the surface shape of the light emitting surface, the loss of light energy when light is emitted from the light emitting surface can be effectively reduced, the utilization rate of light intensity is improved, and the efficient light condensing effect of the light guiding structure is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 shows a schematic structural diagram of a light source device according to an alternative embodiment of the present invention;

[0021] Figure 2 shows Figure 1 a schematic structural diagram of the light guiding structure in

[0022] Figure 3 shows Figure 1 a schematic diagram of another angle of the light guiding structure in

[0023] Figure 4 shows a light distribution curve diagram of the light source device of the present invention.

[0024] Among them, the above-mentioned drawings include the following reference numerals:

[0025] 10, housing; 20, light source substrate; 31, LED; 40, light guiding structure; 41, first flat surface section; 42, second flat surface section; 43, third flat surface section; 44, fourth flat surface section; 45, first transition surface section; 46, second transition surface section; 47, arc surface section; 48, straight surface section; 49, accommodation cavity; 491, light incident surface; 400, lateral connection surface; 401, first surface section; 402, second surface section; 403, third surface section; 404, fourth surface section; 405, fifth surface section; 406, sixth surface section; 411, end face; 50, heat dissipation structure; 60, center line. Detailed implementation manners

[0026] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0027] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0028] In the present invention, unless otherwise stated, the orientation words such as "upper, lower, top, bottom" are usually in reference to the directions shown in the drawings, or in reference to the vertical, perpendicular or gravitational directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation words are not used to limit the present invention.

[0029] In order to solve the problem of light brightness difference existing in the light source device in the prior art, the present invention provides a light source device.

[0030] As Figures 1 to 4 shown, the light source device includes a frame 10, a light source substrate 20, a light source structure and a light guide structure 40. The light source substrate 20 is disposed in the frame 10; the light source structure is disposed on the light source substrate 20; the light guide structure 40 is disposed on the light-emitting side of the light source structure. The surface of the light guide structure 40 away from the light source structure is the light-emitting surface, and the light-emitting surface is composed of a raised surface section and at least two flat surface sections, and there is at least one flat surface section on each side of the raised surface section, and the flat surface sections are parallel to the light source substrate 20.

[0031] By setting the housing 10, the housing 10 provides an installation position for the light source substrate 20, the light source structure, and the light guide structure 40, improving the reliability of use of the light source substrate 20, the light source structure, and the light guide structure 40, and ensuring the stable operation of the light source structure. By arranging the light source structure on the light source substrate 20, the light source substrate 20 can provide a circuit for the light source structure, and at the same time, the light source substrate 20 can also accelerate the heat dissipation of the light source structure to protect the light source structure, ensuring the stability and safety of the operation of the light source structure and ensuring that the light source structure can emit light stably. By setting the light guide structure 40, the light guide structure 40 plays a role in condensing light, enabling the light guide structure 40 to converge the light-emitting angle of the light source structure, thereby achieving the effect of condensing light to increase brightness, effectively increasing the brightness and improving the utilization rate of luminous flux. The light-emitting surface is composed of a raised surface section and at least two flat surface sections. There is at least one flat surface section on each side of the raised surface section, and the flat surface sections are parallel to the light source substrate 20. By reasonably planning the surface shape of the light-emitting surface, the loss of light energy when light is emitted from the light-emitting surface can be effectively reduced, the utilization rate of light intensity is improved, and the efficient light-condensing effect of the light guide structure 40 is ensured.

[0032] It should be noted that the present invention mainly designs a linear scanning light source device with high-efficiency light condensation, realizes small-angle light distribution within a limited size range, reduces the volume of the light source device, improves the utilization rate of luminous flux, and at the same time obtains a uniformly illuminated strip-shaped light spot.

[0033] It should be noted that the light source substrate 20 is preferably an aluminum substrate, which enables the light source substrate 20 to further accelerate the heat dissipation of the light source structure and effectively protect the light source structure.

[0034] It should be noted that the light guide structure 40 is a light guide lens, and the material of the light guide lens includes one of PC and PMMA. Of course, it can also be other materials that can achieve light transmission.

[0035] Specifically, the light source structure includes a plurality of LEDs 31, and the plurality of LEDs 31 are arranged at intervals along a straight line. The light guide structure 40 is strip-shaped, and the extending direction of the strip-shaped light guide structure 40 is the same as the arrangement direction of the plurality of LEDs 31. The light guide structure 40 is symmetrically arranged with respect to the optical axis of the light source structure. In this way, the light guide structure 40 can play a role in condensing light for each of the plurality of LEDs 31, enabling the light-emitting angle of each LED 31 to be effectively contracted, so that the light guide structure 40 can achieve the effect of condensing light to increase brightness for each LED 31, effectively increasing the brightness and improving the utilization rate of luminous flux.

[0036] It should be noted that the multiple LEDs 31 in the above light source structure are arranged linearly at equal intervals, that is, the distance between any two adjacent LEDs 31 among the multiple LEDs 31 is equal. Preferably, the LED 31 is selected as a spherical structure with a diameter of 2.5 mm, so as to further achieve the effect of light condensation and ensure the light brightness of the LED 31.

[0037] Specifically, the distances between at least two flat segments and the light source substrate 20 are equal, so that at least two flat segments are at the same height, that is, the two flat segments are in the same horizontal plane. The distance between the farthest point of the raised surface segment from the light source substrate 20 and the light source substrate 20 is greater than the distance between at least two flat segments and the light source substrate 20, so that the raised surface segment protrudes from the flat segment.

[0038] As Figure 2 shown, there are multiple flat segments, and the multiple flat segments include a first flat segment 41, a second flat segment 42, a third flat segment 43, and a fourth flat segment 44. The surface on the side of the light guide structure 40 away from the light source structure further includes a first transition surface segment 45 connecting the first flat segment 41 and the second flat segment 42 and a second transition surface segment 46 connecting the third flat segment 43 and the fourth flat segment 44. Among them, the second flat segment 42 and the third flat segment 43 are connected to the raised surface segment. It should be noted that the light guide structure 40 has a center line 60, the light guide structure 40 is symmetric along the center line 60, the center line 60 coincides with the optical axis of the LED 31, and both the first transition surface segment 45 and the second transition surface segment are parallel to the center line 60.

[0039] Specifically, the distances between the first flat segment 41 and the fourth flat segment 44 and the light source substrate 20 are equal respectively; the distances between the second flat segment 42 and the third flat segment 43 and the light source substrate 20 are equal respectively; the distance between the first flat segment 41 and the light source substrate 20 is greater than the distance between the second flat segment 42 and the light source substrate 20.

[0040] Specifically, the widths of the first flat segment 41 and the fourth flat segment 44 are equal, the widths of the second flat segment 42 and the third flat segment 43 are equal, and the width of the first flat segment 41 is greater than the width of the second flat segment 42.

[0041] In an embodiment not shown in the figure, the raised surface segment is an arc surface segment 47. That is, the raised surface segment is a continuous arc surface segment 47, and both sides of the raised surface segment are connected to the second flat segment 42 and the third flat segment 43 respectively.

[0042] As Figure 2As shown, the raised surface section includes a combined surface section composed of an arc surface section 47 and a straight surface section 48. Among them, there are multiple straight surface sections 48, and the multiple straight surface sections 48 are symmetrically arranged on both sides of the arc surface section 47 respectively, and the multiple straight surface sections 48 on the same side are arranged at an angle. In this application, two straight surface sections 48 that are angularly connected are respectively arranged on both sides of the arc surface section 47.

[0043] Specifically, the radius of curvature of the arc surface section 47 is greater than or equal to 4.4 mm and less than or equal to 4.6 mm. In this application, the radius of curvature of the arc surface section 47 is 4.5 mm.

[0044] As Figure 2 shown, the surface of one side of the light guide structure 40 facing the light source structure has a recessed portion, and the recessed portion forms a receiving cavity 49 for receiving the light source structure. Such a setting makes the receiving cavity 49 used to place the LED 31. The receiving cavity 49 provides a receiving space for the LED 31, improves the use reliability of the LED 31, and at the same time, the receiving cavity 49 protects the LED 31, avoiding the situation that the light guide structure 40 presses the LED 31 or causes wear to the LED 31, and ensuring that the LED 31 can operate stably. The recessed portion has a light incident surface 491, and the light incident surface 491 is an arc surface. The light emitted by the LED 31 enters the light guide structure 40 through the light incident surface 491. The specific size of the receiving cavity 49 can be designed according to the size of the LED 31. In this application, the diameter of the cross-section of the receiving cavity 49 is 3 mm, that is to say, the diameter of the light incident surface 491 is 3 mm. When placing the LED 31, the center of the LED 31 should be on the center line 60 of the light guide structure 40. The light guide structure 40 also includes two end faces 411 on the side facing the light source structure. The two end faces 411 are symmetrically arranged along the center line 60 and are respectively connected to the light incident surface 491. The two end faces 411 are on the same horizontal plane and are parallel to the light source substrate 20. The end face 411 is flush with the surface of the side of the LED 31 away from the light guide structure 40.

[0045] As Figure 3 shown, the light guide structure 40 further includes a lateral connection surface 400 connecting the light emitting surface and the light incident surface 491. Specifically, the light incident surface 491 is connected to the lateral connection surface 400 through the end face 411. The lateral connection surface 400 is composed of multiple surface sections continuously arranged along a curve direction, and an angle is provided between adjacent two surface sections, and the surface section is a plane. The lateral connection surface 400 is a total reflection surface. The light emitted by the LED 31 enters the light guide structure 40 through the light incident surface 491, and then the lateral connection surface 400 totally reflects the light of the LED 31, so that the light is parallel to the center line 60 after total reflection and then exits.

[0046] Specifically, the lateral connection surface 400 includes a first surface segment 401, a second surface segment 402, a third surface segment 403, a fourth surface segment 404, a fifth surface segment 405, and a sixth surface segment 406 that are sequentially connected along a curve. One side of the first surface segment 401 away from the second surface segment 402 is connected to the end face 411, and one side of the sixth surface segment 406 away from the fifth surface segment 405 is connected to the first plane segment 41 or the fourth plane segment 44. In this application, the angle between the first surface segment 401 and the center line 60 is 41.5°, the angle between the second surface segment 402 and the center line 60 is 35°, the angle between the third surface segment 403 and the center line 60 is 30.5°, the angle between the fourth surface segment 404 and the center line 60 is 27.5°, the angle between the fifth surface segment 405 and the center line 60 is 24.5°, and the angle between the sixth surface segment 406 and the center line 60 is 22°. Such a setting enables the large-angle light emitted by the LED 31 to form light rays that are nearly parallel to the center line 60 after total internal reflection through the lateral connection surface 400, and then be emitted from the first plane segment 41 and the fourth plane segment 44. The small-angle light emitted by the LED 31 forms light rays that are nearly parallel to the center line 60 through the arc surface segment 47 and then is emitted. Among the two straight surface segments 48 on one side of the arc surface segment 47, one straight surface segment 48 close to the arc surface segment 47 has an angle of 32° with the center line 60, so that the medium-angle light emitted by the LED 31 forms light rays that are nearly parallel to the center line 60 through this straight surface segment 48 and then is emitted; one straight surface segment 48 away from the arc surface segment 47 has an angle of 13° with the center line 60, so that the medium-angle light emitted by the LED 31 forms total internal reflection light rays through this straight surface segment 48 and then forms light rays that are nearly parallel to the center line 60 through the arc surface segment 47 and is emitted.

[0047] As Figure 1 shown, the light source device further includes a heat dissipation structure 50. The heat dissipation structure 50 is disposed on the housing 10 and is located on the backlight side of the light source structure. The heat dissipation structure 50 includes one of a heat sink and a fan. In this application, a heat sink is adopted. The material of the heat sink can be a metal material. Through the heat sink, the heat generated by the light emission of the light source structure can quickly dissipate, achieving the effect of rapid heat dissipation. Of course, a fan can also be used to dissipate heat from the light source structure.

[0048] As Figure 4 shown, the light source device forms a strip-shaped light spot with a width within 10 mm at a position 40 mm away from the scanned object surface, and the emission angle is approximately 10°. This effectively reduces light decay, improves the utilization rate of luminous flux, realizes a light source device with a small volume and uniform light emission, and achieves a light spot effect of a certain size. The volume width of the light guide structure 40 in this application is 10.6 mm, the height is 6.5 mm, and the length can be arbitrarily cut according to the length requirement of the light source structure. Of course, the specific dimensions of the light guide structure 40 can be set according to the actual situation.

[0049] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0052] The above description is only the preferred embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A light source device, characterized in that, comprising: a housing (10); a light source substrate (20), the light source substrate (20) being disposed within the housing (10); a light source structure, the light source structure being disposed on the light source substrate (20); a light guide structure (40), the light guide structure (40) being disposed on the light-emitting side of the light source structure, a surface of the light guide structure (40) away from the light source structure being a light-emitting surface, the light-emitting surface being composed of a raised surface segment and at least two flat surface segments, and there being at least one of the flat surface segments on each side of the raised surface segment, the flat surface segments being parallel to the light source substrate (20); the raised surface segment includes a combined surface segment composed of an arc surface segment (47) and a straight surface segment (48), wherein, there are a plurality of the straight surface segments (48), and the plurality of straight surface segments (48) are symmetrically disposed on both sides of the arc surface segment (47) respectively, and the plurality of straight surface segments (48) on the same side are disposed at an angle to each other; the radius of curvature of the arc surface segment (47) is greater than or equal to 4.4 mm and less than or equal to 4.6 mm; the flat surface segments include a first flat surface segment (41), a second flat surface segment (42), a third flat surface segment (43) and a fourth flat surface segment (44), a surface of the light guide structure (40) away from the light source structure further includes a first transition surface segment (45) connecting the first flat surface segment (41) and the second flat surface segment (42) and a second transition surface segment (46) connecting the third flat surface segment (43) and the fourth flat surface segment (44), wherein, the second flat surface segment (42) and the third flat surface segment (43) are connected to the raised surface segment; the distances between the first flat surface segment (41) and the light source substrate (20) and between the fourth flat surface segment (44) and the light source substrate (20) are equal respectively; the distances between the second flat surface segment (42) and the light source substrate (20) and between the third flat surface segment (43) and the light source substrate (20) are equal respectively; the distance between the first flat surface segment (41) and the light source substrate (20) is greater than the distance between the second flat surface segment (42) and the light source substrate (20); the width of the first flat surface segment (41) is greater than the width of the second flat surface segment (42).

2. The light source device according to claim 1, characterized in that, the light source structure includes a plurality of LEDs (31), the plurality of LEDs (31) being arranged at intervals along a straight line, the light guide structure (40) being strip-shaped, the extending direction of the strip-shaped light guide structure (40) being the same as the arrangement direction of the plurality of LEDs (31), and the light guide structure (40) being symmetrically disposed with respect to the optical axis of the light source structure.

3. The light source device according to any one of claims 1 to 2, characterized in that, a surface of the light guide structure (40) facing the light source structure has a recessed portion, the recessed portion forming a receiving cavity (49) for receiving the light source structure, the recessed portion having a light-incident surface (491), the light-incident surface (491) being an arc surface.

4. The light source device according to claim 3, characterized in that, The light guide structure (40) further includes a lateral connection surface (400) connecting the light-emitting surface and the light-incident surface (491), and the lateral connection surface (400) is composed of a plurality of surface segments continuously arranged in a curved direction, and an angle is provided between two adjacent surface segments, and the surface segments are flat surfaces.

5. The light source device according to any one of claims 1 to 2, characterized in that the light source device further includes a heat dissipation structure (50), the heat dissipation structure (50) is disposed on the housing (10) and is located on the backlight side of the light source structure, and the heat dissipation structure (50) includes one of a heat sink and a fan.

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