Coaxial light source emitting device

Abstract

The utility model relates to a coaxial light source emitting device, which belongs to the technical field of imaging light source emitting devices and comprises a printed circuit board (PCB), light-emitting diode (LED) lamp beads, a Fresnel lens and a semi-transparent and semi-reflecting mirror. The Fresnel lenses are arranged on the side, corresponding to the LED lamp beads, of the PCB in parallel so that light emitted by the LED lamp beads can be refracted into parallel light. The semi-transparent and semi-reflective mirror is located on the side, away from the LED lamp beads, of the Fresnel lens, and the mirror face of the semi-transparent and semi-reflective mirror and the mirror face of the Fresnel lens form an included angle alpha so as to vertically reflect the parallel light rays to obtain coaxial imaging light rays. According to the utility model, the Fresnel lens is additionally arranged between the LED lamp beads and the semi-transparent and semi-reflecting mirror, so that light rays emitted by the LED lamp beads tend to be parallel and are distributed more uniformly, more coaxial imaging light rays are obtained after the parallel light rays enter the semi-transparent and semi-reflecting mirror, the power consumption of the LED lamp beads is reduced, the working temperature of the LED lamp beads is reduced, and the service life of the LED lamp beads is prolonged. And the service life of the coaxial light source emitting device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging light source emitting devices, in particular to a coaxial light source emitting device. Background Art

[0002] Thin film or glass surface inspection requires a linear coaxial light source. The existing coaxial imaging light source emitting device is mainly composed of a PCB circuit board, multiple LED lamp beads and a semi-transparent and semi-reflective mirror. The multiple LED lamp beads are fixed on the PCB circuit board in an array; the semi-transparent and semi-reflective mirror is arranged at an angle on the side of the PCB circuit board where the multiple LED lamp beads are fixed; among them, the semi-transparent and semi-reflective mirror can reflect the light source emitted by the LED lamp beads into a coaxial light source. However, in actual use, since the target object is far away from the coaxial light source, more than 1 meter, and since the existing light source is not a theoretically parallel light source, the light emitted by the existing coaxial imaging light source emitting device is severely lost after reaching the target object, and the picture taking effect is poor.

[0003] To address these technical issues, most manufacturers increase the light source power to ensure light intensity and improve photographic quality. However, this increase in light source power also increases the internal temperature of the coaxial light source. Furthermore, improperly designed heat dissipation structures can significantly increase the heat inside the light source. After more than one month of use in an industrial environment, the internal transflective and reflective mirrors can become deformed, significantly shortening the lifespan of the light source.

[0004] Therefore, how to design a coaxial light source emitting device with simple structure, easy assembly, efficient heat dissipation, low energy consumption, high luminous uniformity and good parallelism is a technical problem that needs to be solved urgently by technical personnel in this field. Utility Model Content

[0005] The utility model provides a coaxial light source emitting device, which solves the technical problems of existing coaxial imaging light source emitting devices, such as high power consumption, high internal operating temperature, poor uniformity and parallelism of emitted light, and short service life.

[0006] The utility model solves the above technical problems with the following technical solutions: a coaxial light source emitting device, comprising: a PCB circuit board, an LED lamp bead, a Fresnel lens and a semi-transparent and semi-reflective mirror,

[0007] The LED lamp bead is fixed on the PCB circuit board; the Fresnel lens is arranged in parallel on the side of the PCB circuit board corresponding to the LED lamp bead to refract the light emitted by the LED lamp bead into parallel light; the semi-transparent and semi-reflective mirror is located on the side of the Fresnel lens away from the LED lamp bead and its mirror surface is arranged at an angle α with the mirror surface of the Fresnel lens to vertically reflect the parallel light to obtain coaxial imaging light.

[0008] The beneficial effects of the present invention are: improving the structure of the traditional coaxial light source emitting device, and by adding a Fresnel lens between the LED lamp beads and the semi-transparent and semi-reflective mirror, the light emitted by the LED lamp beads can be made more parallel and distributed more evenly, so that after the parallel light is incident on the semi-transparent and semi-reflective mirror, more coaxial imaging light can be obtained (under the same electrical power energy consumption of the LED lamp beads, a stronger coaxial imaging light source can be obtained), reducing the power consumption of the LED lamp beads, lowering the operating temperature of the LED lamp beads, and extending the service life of the coaxial light source emitting device.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, it also includes a hemispherical focusing lens, which is arranged on the outer peripheral side of the LED lamp bead and fixed on the PCB circuit board to collect the light emitted by the LED lamp bead.

[0011] The further beneficial effect of adopting the above method is: using a focusing lens to collect the light emitted by the LED lamp beads can, on the one hand, avoid the scattering of light emitted by the LED lamp beads, obtain more coaxial imaging light, and improve light utilization; on the other hand, it can prevent the scattered light emitted by the LED lamp beads from heating the surrounding air and affecting the service life of the emitting device.

[0012] Furthermore, the LED lamp beads and the focusing lenses are arranged in a one-to-one correspondence.

[0013] Furthermore, the focusing angle of the focusing lens is 30 to 60 degrees.

[0014] Furthermore, it also includes an LSD diffusion film, which is bonded in parallel to the mirror surface of the Fresnel lens on the side corresponding to the LED lamp bead to diffuse the light emitted by the LED lamp bead.

[0015] A further beneficial effect of the above-mentioned method is that by bonding the LSD diffusion film to the mirror surface of the Fresnel lens corresponding to the LED lamp beads, the light emitted by the LED lamp beads can be diffused and the light emitted by the LED lamp beads can be controlled within a certain range, so that the light can be utilized to the greatest extent, thereby reducing the power consumption of the LED lamp beads, lowering the operating temperature of the LED lamp beads, and extending the service life of the coaxial light source emitting device.

[0016] Furthermore, the astigmatism angle of the LSD diffusion film is 30 to 60 degrees.

[0017] Furthermore, it also includes a constant current controller, which is electrically connected to the PCB circuit board and the LED lamp beads respectively.

[0018] Furthermore, it also includes a protective shell, the interior of which is hollow and a light-emitting hole is provided on its side; the PCB circuit board, the Fresnel lens and the semi-transparent and semi-reflective mirror are all fixed on the inner wall of the protective shell and the coaxial imaging light is arranged opposite to the light-emitting hole.

[0019] Furthermore, the angle α is 30 to 60 degrees.

[0020] Furthermore, the distance between the Fresnel lens and the LED lamp bead is 45 to 55 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the arrangement structure of a constant current controller, a PCB circuit board, LED lamp beads, a focusing lens, an LSD diffusion film and a semi-transparent and semi-reflective mirror in a coaxial light source emitting device of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of a coaxial light source emitting device of the utility model;

[0023] Figure 3 This is a schematic diagram of the principle of a semi-transparent and semi-reflective mirror in a coaxial light source emitting device of the utility model.

[0024] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0025] 1. PCB circuit board, 2. LED lamp beads, 3. Fresnel lens, 4. Semi-transparent and semi-reflective mirror, 5. Focusing lens, 6. LSD diffusion film, 7. Constant current controller, 8. Protective shell. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] like Figure 1 or Figure 2 As shown, a coaxial light source emitting device includes: a PCB circuit board 1, an LED lamp bead 2, a Fresnel lens 3 and a semi-transparent and semi-reflective mirror 4,

[0028] The LED lamp bead 2 is fixed on the PCB circuit board 1; the Fresnel lens 3 is arranged in parallel on the side of the PCB circuit board 1 corresponding to the LED lamp bead 2 to refract the light emitted by the LED lamp bead 2 into parallel light; the semi-transparent and semi-reflective mirror 4 is located on the side of the Fresnel lens 3 away from the LED lamp bead 2 and its mirror surface is arranged at an angle α with the mirror surface of the Fresnel lens 3 to vertically reflect the parallel light to obtain coaxial imaging light.

[0029] like Figure 1 or Figure 2As shown, in some specific embodiments, a hemispherical focusing lens 5 may also be included. The focusing lens 5 is covered on the outer peripheral side of the LED lamp bead 2 and fixed on the PCB circuit board 1 to collect the light emitted by the LED lamp bead 2.

[0030] Specifically, the LED lamp beads 2 and the focusing lenses 5 can be arranged in a one-to-one correspondence.

[0031] Specifically, the focusing angle of the focusing lens 5 may be 30-60°.

[0032] like Figure 1 or Figure 2 As shown, in some specific embodiments, an LSD diffusion film 6 may be further included. The LSD diffusion film 6 is bonded in parallel to the mirror surface of the Fresnel lens 3 corresponding to the LED lamp bead 2 to diffuse the light emitted by the LED lamp bead 2.

[0033] Specifically, the light astigmatism angle of the LSD diffusion film 6 may be 30-60°.

[0034] like Figure 1 As shown, in some specific embodiments, a constant current controller 7 may be further included, and the constant current controller 7 is electrically connected to the PCB circuit board 1 and the LED lamp bead 2 respectively.

[0035] like Figure 2 As shown, in some specific embodiments, a protective shell 8 may also be included, the interior of the protective shell 8 is hollow and a light-emitting hole is provided on its side; the PCB circuit board 1, the Fresnel lens 3 and the semi-transparent and semi-reflective mirror 4 are all fixed on the inner wall of the protective shell 8 and the coaxial imaging light is arranged opposite to the light-emitting hole.

[0036] Specifically, the angle α may be 30 to 60 degrees.

[0037] Specifically, the distance between the Fresnel lens 3 and the LED lamp bead 2 may be 45-55 mm.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coaxial light source emitting device, characterized in that: include: PCB circuit board (1), LED lamp beads (2), the LED lamp beads (2) being fixed on the PCB circuit board (1); A Fresnel lens (3), the Fresnel lens (3) being arranged in parallel on a side of the PCB circuit board (1) corresponding to the LED lamp bead (2) to refract the light emitted by the LED lamp bead (2) into parallel light; A semi-transparent and semi-reflective mirror (4) is located on a side of the Fresnel lens (3) away from the LED lamp bead (2), and its mirror surface is arranged at an angle α with the mirror surface of the Fresnel lens (3) to vertically reflect the parallel light to obtain coaxial imaging light.

2. A coaxial light source emitting device according to claim 1, characterized in that: It also includes a hemispherical condensing lens (5), which is arranged on the outer peripheral side of the LED lamp bead (2) and fixed on the PCB circuit board (1) to collect light emitted by the LED lamp bead (2).

3. The coaxial light source emitting device according to claim 2, characterized in that: The LED lamp beads (2) and the focusing lenses (5) are both arranged in a one-to-one correspondence.

4. The coaxial light source emitting device according to claim 2, characterized in that: The focusing angle of the focusing lens (5) is 30-60°.

5. The coaxial light source emitting device according to claim 2, characterized in that: It also includes an LSD diffusion film (6), which is bonded in parallel to the mirror surface of the Fresnel lens (3) on the side corresponding to the LED lamp bead (2) to diffuse the light emitted by the LED lamp bead (2).

6. The coaxial light source emitting device according to claim 5, characterized in that: The astigmatism angle of the LSD diffusion film (6) is 30-60°.

7. The coaxial light source emitting device according to claim 1, characterized in that: It also includes a constant current controller (7), which is electrically connected to the PCB circuit board (1) and the LED lamp bead (2) respectively.

8. The coaxial light source emitting device according to claim 1, characterized in that: The invention also includes a protective shell (8), the interior of the protective shell (8) is hollow and a light-emitting hole is provided on its side; the PCB circuit board (1), the Fresnel lens (3) and the semi-transparent and semi-reflective mirror (4) are all fixed on the inner wall of the protective shell (8), and the coaxial imaging light is arranged opposite to the light-emitting hole.

9. The coaxial light source emitting device according to claim 1, characterized in that: The angle α is 30 to 60 degrees.

10. The coaxial light source emitting device according to claim 1, characterized in that: The distance between the Fresnel lens (3) and the LED lamp bead (2) is 45 to 55 mm.

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