A ring-shaped visual light source with adjustable inclination

Abstract

The present invention relates to a visual light source. The purpose is to provide a ring-shaped visual light source with adjustable inclination angle. This ring-shaped visual light source should be able to flexibly adjust its inclination as needed, and should feature good lighting effects and ease of use. The technical solution is a ring-shaped visual light source with adjustable inclination angle, comprising a cylindrical housing with an open top and a circular hole in the bottom. The housing is characterized in that two coaxially arranged metal rings of different diameters are fixed within the housing, along with a plurality of PCBs of light beads radially positioned on the two rings.

Description

Technical Field

[0001] The invention relates to a visual light source, in particular to a ring-shaped visual light source with adjustable inclination angle. Background Art

[0002] Light sources are essential components of machine vision systems and are widely used. Lighting the surface or contour of the object being measured is a crucial step in machine vision system applications. The light source's illumination angle (A) is a key technical indicator. Different materials, shapes, and visual requirements require light sources with varying inclinations. However, current manufacturers can only produce 3-5 fixed-angle light sources, which limits optimal lighting results during lighting experiments.

[0003] Therefore, widely used ring lights are also composed of a custom-shaped "funnel" PCB board, LED lamp beads, a light diffuser, and a housing; examples include CN107514576 and CN208720178. Because the tilt angle cannot be adjusted, even for ring lights of the same diameter, different shapes and sizes of PCB boards and housings are required due to the different light inclination angles. Due to these various customizations, the overall cost of these ring lights remains high, placing certain cost pressures on both manufacturers and users. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a ring-shaped visual light source with adjustable inclination angle. The ring-shaped visual light source should be able to flexibly adjust the inclination angle according to needs and has the characteristics of good lighting effect and easy use.

[0005] The technical solution proposed by the present invention is:

[0006] A circular visual light source with adjustable inclination angle, comprising a cylindrical housing with an open top and a circular hole in the bottom; characterized in that: two coaxially arranged metal rings of different diameters are fixed within the housing, and a plurality of PCBs of lamp beads are radially positioned on the two rings;

[0007] The two circular rings include a fulcrum ring with a smaller diameter fixed to the inner side of the bottom surface of the shell by a number of positioning components, and an adjustment ring with a larger diameter positioned to the inner side of the bottom surface of the shell by a number of height adjustment components; the two circular rings maintain an adjustable distance between the axial directions and are coaxially arranged with the shell, so that the fulcrum ring is fixed and the adjustment ring can move up and down in the coaxial direction of the two circular rings.

[0008] Each lamp bead PCB board is positioned on the two rings through the support ring slot and adjustment ring slot set on its own board surface; all the lamp bead PCB boards are distributed in a circular array on the two rings.

[0009] The positioning assembly includes a support ring and a ring pressure piece; the support ring is arranged on the inner side of the bottom surface of the shell and cantilevers toward the top surface, and the top of the support ring is provided with an annular groove coaxially arranged with the shell and arranged with a plurality of cutting grooves distributed in a circular array; the fulcrum ring is embedded in the annular groove and then positioned by the ring pressure piece cover fixed by screws.

[0010] The height adjustment assembly includes an adjusting screw positioned on the bottom surface of the shell, an adjusting nut matched with the adjusting screw and engaged with the adjusting ring through an adjusting nut slot, and an adjusting spring sleeved on the adjusting screw with both ends applying force to the bottom surface of the shell and the adjusting nut respectively.

[0011] The lamp bead PCB board is rectangular and has printed circuits on its surface. The side of its longer side is sequentially provided with a number of LED lamp beads and the notches of the fulcrum ring slot; the side of its shorter side away from the fulcrum ring slot and the LED lamp beads is provided with the notch of the adjustment ring slot.

[0012] The fulcrum ring groove is an open groove with the bottom extending along the width direction of the lamp bead PCB board, and the extension distance is one-half to two-thirds of the width of the lamp bead PCB board; the adjustment ring groove is an open groove with the bottom extending along the length direction of the lamp bead PCB board, and the extension distance is one-third to two-thirds of the length of the lamp bead PCB board.

[0013] The width of the cutting groove is greater than the thickness of the lamp bead PCB board; the distance from the bottom of the cutting groove to the bottom of the annular clamping groove is greater than the distance from the bottom of the fulcrum ring clamping groove to the side of the lamp bead PCB board facing away from the LED lamp bead.

[0014] The adjusting ring clamping groove passes through the front and rear side surfaces of the adjusting nut, and the clamping notch is located on the left side surface of the adjusting nut; the screw hole matched with the adjusting screw rod passes through the upper and lower side surfaces of the adjusting nut.

[0015] The axis of the adjusting screw is perpendicular to the bottom surface of the shell.

[0016] The present invention has the beneficial effect of arbitrarily adjusting the illumination angle of an annular visual light source of the same diameter by simply adjusting the adjustment screw, thereby achieving the optimal lighting effect and meeting the needs of machine vision systems. More importantly, the present invention eliminates the "funnel-shaped" PCB substrate required in the prior art, which must be customized for various sizes and angles. Instead, it uses multiple pieces of uniformly shaped and specified lamp bead PCB boards, which can be used universally for annular light sources of various sizes and diameters. This uniformly shaped and specified lamp bead PCB board not only does not require customization but can also be mass-produced, resulting in extremely low cost. Therefore, annular light sources of different specifications can be simply assembled by configuring different numbers of lamp bead PCB boards, which provides excellent versatility and significantly reduces manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 Schematic diagram of the DD cross-sectional structure.

[0019] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle lamp bead PCB board.

[0020] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle adjusting nut.

[0021] Figure 5 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle shell.

[0022] Figure 6 Schematic diagram of the light source illumination angle according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the main structure of the middle lamp bead PCB board.

[0024] The numbers in the figure are: 1 is the shell, 1-1 is the round hole, 1-2 is the support ring, 1-21 is the annular slot, 1-22 is the cutting slot, 2 is the lamp bead PCB board, 2-1 is the lamp bead, 2-2 is the adjustment ring slot, 2-3 is the fulcrum ring slot, 2-31 is the slot bottom, 3 is the adjustment ring, 4 is the fulcrum ring, 5 is the adjustment screw, 6 is the adjustment spring, 7 is the adjustment nut, 7-1 is the screw hole, 7-2 is the adjustment nut slot, 7-21 is the embedding slot, 8 is the ring pressure piece, and A is the inclination angle. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0026] The light source irradiation angle (the angle between the light emitting center line Z of the lamp bead PCB board and the horizontal plane P) is the inclination angle A (see Figure 6 ), is a key indicator of the machine vision system. In view of the defect that the inclination angle cannot be adjusted arbitrarily in the existing machine vision system, the present invention provides an annular visual light source with an improved structure.

[0027] The annular visual light source with adjustable inclination shown in the accompanying drawings comprises a top surface opening ( Figure 2 The cylindrical shell 1 has a bottom surface at the top and a top surface facing downwards and a circular hole 1-1 formed on the bottom surface; this is similar to the structure of the existing annular visual light source.

[0028] The innovation of the present invention is that two circular rings and multiple lamp bead PCB boards 2 are fixed in the shell; the two circular rings are coaxially arranged but have different diameters; the multiple lamp bead PCB boards are distributed in a circular array and positioned on the two circular rings, and are arranged radially in the axial projection of the shell.

[0029] The two rings are the fulcrum ring 4 and the adjustment ring 3; the fulcrum ring has a smaller diameter and is fixed to the inner side of the bottom surface of the housing by a positioning assembly; the adjustment ring has a larger diameter and is positioned to the inner side of the bottom surface of the housing by a height adjustment assembly. Figure 2 The middle is between the upper and lower parts) and maintains an adjustable distance and is coaxially arranged with the housing so that the fulcrum ring is fixed and the adjustment ring can move up and down in the coaxial direction of the two rings.

[0030] Each LED PCB has two elongated slots extending through the board. These slots are the pivot ring slot 2-3 and the adjustment ring slot 2-2. The pivot ring slot snaps onto the pivot ring and serves as the fulcrum for angle adjustment. The adjustment ring slot snaps onto the adjustment ring and adjusts the PCB's tilt angle as the adjustment ring moves up and down.

[0031] The positioning assembly includes a support ring 1-2 and a ring pressing piece 8; the support ring is arranged on the inner side of the bottom surface of the shell and is cantilevered toward the top surface, and the annular groove 1-21 is opened at the top end of the support ring (i.e., the cantilevered end) and is coaxially arranged with the shell (lamp bead PCB board); a plurality of cutting grooves 1-22 are distributed in a circumferential array at the top end of the support ring; the fulcrum ring is embedded in the annular groove, and then the ring pressing piece (8) fixed by screws is sealed and positioned (by Figure 2 It can be seen that one end of the SZ-shaped ring pressure piece is fixed to the inner side of the bottom surface of the shell by screws, and the other end is cantilevered to the annular groove notch at the top of the support ring, and the fulcrum ring cover is positioned in the annular groove).

[0032] Furthermore, the width of the cutting groove is slightly greater than (preferably greater than 0.5-1.5 mm) the thickness of the LED PCB. The distance from the bottom of the cutting groove to the bottom of the annular retaining groove is greater than the distance from the bottom of the fulcrum retaining groove to the side of the PCB facing away from the LED. Furthermore, one corner of the PCB (the corner closest to the bottom of the fulcrum retaining groove) is rounded; preferably, this rounded corner is coaxial with the arc surface 2-31 of the fulcrum retaining groove bottom to prevent interference with the PCB during tilt adjustment.

[0033] The height adjustment assembly includes an adjusting screw 5, an adjusting nut 7 matched with the adjusting screw, and an adjusting spring 6; the adjusting screw is inserted into the through hole on the bottom surface of the shell and can be positioned on the shell by rotating around its own axis (as recommended: the axis of the adjusting screw is also perpendicular to the bottom surface of the shell); the adjusting nut is also engaged with the adjusting ring through the opening of the adjusting nut slot 7-2, so that the adjusting ring is reliably connected and positioned in the shell; the adjusting spring is sleeved on the adjusting screw, and the two ends of the adjusting spring apply force to the bottom surface of the shell and the adjusting nut respectively, so that the adjusting ring can stay at any position after adjustment, and the angle positioning of all lamp bead PCB boards is more accurate and stable.

[0034] The number of the positioning components and height adjustment components can be determined according to the size of the annular light source and the number of lamp bead PCB boards distributed. Usually, 3-4 of them are evenly distributed in the circumferential direction.

[0035] like Figure 3 As shown, the lamp bead PCB board is rectangular and has a printed circuit on its surface (this is similar to the existing lamp bead PCB board), and the side of its longer side is sequentially provided with a number of LED lamp beads 2-1 and a notch of the fulcrum ring slot; the bottom of the fulcrum ring slot extends along the width direction of the lamp bead PCB board, preferably extending a distance of one-half to two-thirds of the width of the lamp bead PCB board; a number of LED lamp beads are arranged in sequence on the lamp bead PCB board and are all connected to the printed circuit on the lamp bead PCB board (existing technology). The side of the shorter side of the lamp bead PCB board away from the fulcrum ring slot and the LED lamp beads is provided with a notch of the adjustment ring slot; the bottom of the adjustment ring slot extends along the length direction of the lamp bead PCB board, preferably extending a distance of one-third to two-thirds of the length of the lamp bead PCB board. Preferably, the width of the fulcrum ring slot is slightly smaller than the fulcrum ring, and the diameter of the arc surface of the bottom 2-31 of the fulcrum ring slot is slightly larger than the fulcrum ring, which can be more conducive to the installation and adjustment of the lamp bead PCB board.

[0036] like Figure 4 As shown, the adjusting nut slot 7-2 passes through the front and rear sides of the adjusting nut, and the embedding notch 7-21 is located on the left side of the adjusting nut (the side facing away from the screw hole); the screw hole 7-1 that cooperates with the adjusting screw passes through the upper and lower sides of the adjusting nut.

[0037] In addition, after the present invention is assembled, it is only necessary to connect the wire connectors of the printed circuits on the PCB boards of the lamp beads according to the design requirements; these are existing technologies and will not be described in detail.

[0038] The present invention changes the inclination angle of the annular visual light source simply by turning the adjustment screw to move the adjustment ring up and down, which in turn causes the lamp bead PCB to swing accordingly. Adjustment requires only ensuring that the vertical adjustment distances of the several adjustment screws are consistent, making inclination adjustment extremely simple and convenient. Furthermore, all inclination angles within annular visual light sources of the same diameter can be adjusted steplessly, and annular visual light sources of different diameters can utilize the same specification of lamp bead PCB, thus resolving a long-standing technical bottleneck in the industry.

Claims

1. A circular visual light source with adjustable inclination angle, comprising a cylindrical housing (1) with an open top surface and a circular hole (1-1) on the bottom surface; characterized in that: Two metal rings with different diameters and arranged coaxially are fixed in the housing, as well as a plurality of lamp bead PCB boards (2) positioned radially on the two rings; The two circular rings include a fulcrum ring (4) having a smaller diameter and fixed on the inner side of the bottom surface of the shell by a plurality of positioning components, and an adjustment ring (3) having a larger diameter and positioned on the inner side of the bottom surface of the shell by a plurality of height adjustment components; the two circular rings maintain an adjustable distance between the axial directions and are arranged coaxially with the shell, so that the fulcrum ring is fixed and the adjustment ring can move up and down in the coaxial direction of the two circular rings; Each lamp bead PCB board is positioned on the two circular rings by being embedded in a supporting ring slot (2-3) and an adjustment ring slot (2-2) provided on its own board surface; all the lamp bead PCB boards are distributed in a circular array on the two circular rings; The lamp bead PCB board is rectangular and has printed circuits on its surface, and a plurality of LED lamp beads (2-1) and notches of the fulcrum ring slot are sequentially arranged on the side surface of the longer side; A notch of the adjusting ring slot is provided on the side surface of the shorter side away from the fulcrum ring slot and the LED lamp bead; The fulcrum ring clamping groove is an open groove with a groove bottom (2-31) extending along the width direction of the lamp bead PCB board, and the extension distance is one half to two thirds of the width of the lamp bead PCB board; the adjustment ring clamping groove is an open groove with a groove bottom extending along the length direction of the lamp bead PCB board, and the extension distance is one third to two thirds of the length of the lamp bead PCB board.

2. The annular visual light source with adjustable inclination according to claim 1, characterized in that: The positioning assembly comprises a support ring (1-2) and a ring pressing piece (8); the support ring is arranged on the inner side of the bottom surface of the shell and cantilevers toward the top surface, the top end of the support ring is provided with an annular clamping groove (1-21) arranged coaxially with the shell and is provided with a plurality of cutting grooves (1-22) distributed in a circumferential array; the fulcrum ring is embedded in the annular clamping groove and then sealed and positioned by the ring pressing piece (8) fixed by screws.

3. The annular visual light source with adjustable inclination according to claim 2, characterized in that: The height adjustment assembly comprises an adjustment screw (5) positioned on the bottom surface of the housing, an adjustment nut (7) matched with the adjustment screw and engaging with the adjustment ring through an adjustment nut slot (7-2), and an adjustment spring (6) sleeved on the adjustment screw and with two ends applying force to the bottom surface of the housing and the adjustment nut, respectively.

4. The annular visual light source with adjustable inclination according to claim 3, characterized in that: The width of the cutting groove is greater than the thickness of the lamp bead PCB board; the distance from the bottom of the cutting groove to the bottom of the annular clamping groove is greater than the distance from the bottom of the fulcrum ring clamping groove to the side of the lamp bead PCB board facing away from the LED lamp bead.

5. The annular visual light source with adjustable inclination according to claim 4, characterized in that: The adjusting nut slot passes through the front and rear sides of the adjusting nut, and the engaging notch (7-21) is located on the left side of the adjusting nut; the screw hole (7-1) matched with the adjusting screw rod passes through the upper and lower sides of the adjusting nut.

6. The annular visual light source with adjustable inclination according to claim 5, characterized in that: The axis of the adjusting screw is perpendicular to the bottom surface of the shell.

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