Infrared laser and visible light composite light source with synchronous divergence angles

Abstract

The utility model provides an infrared laser and visible light composite light source with synchronous divergence angles, which comprises a white light LED (light-emitting diode), an infrared laser source, a dichroic wave plate, converging lenses and a light transmitting bundle, a beam expanding lens, a second collimating lens and a compensating lens are sequentially arranged on a light path of the infrared laser source, the dichroic wave plate is obliquely arranged, one face of the dichroic wave plate faces the first collimating lens, the other face of the dichroic wave plate faces the compensating lens and the converging lens, and light emitted by the white light LED and the infrared laser source is combined through the dichroic wave plate and then is transmitted to the beam expanding lens. The light is focused to the end face of the light-transmitting bundle through the converging lens; the compensation lens is a meniscus lens. By adopting the technical scheme of the utility model, the infrared laser divergence angle and the visible light divergence angle are synchronously adjusted to be consistent, the risk of melting of the plugging light guide bundle caused by overlong infrared focal length is avoided, and the system safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of special lighting, in particular to an infrared laser and visible light composite light source with synchronous divergence angles. Background Art

[0002] At present, for the composite light source of infrared laser and visible light, during the focusing process, due to the wavelength difference between the infrared laser and the visible light, the focal length of the infrared laser is slightly longer than that of the visible light, and the divergence angles of the two are different, which easily causes the guide light beam to burn out after beam combination. Content of the Utility Model

[0003] In view of the above technical problems, the utility model discloses an infrared laser and visible light composite light source with focal length advance compensation and synchronous divergence angles, so that the divergence angle of the infrared laser is consistent with that of the visible light.

[0004] For this, the technical solution of the utility model is as follows:

[0005] An infrared laser and visible light composite light source with synchronous divergence angles, which comprises a white light LED, an infrared laser source, a dichroic wave plate, a converging lens and a guide light beam. A first converging lens and a first collimating lens are sequentially arranged on the light path of the white light LED. An expanding lens, a second collimating lens and a compensating lens are sequentially arranged on the light path of the infrared laser source. The dichroic wave plate is inclined. One side of the dichroic wave plate faces the first collimating lens, and the other side faces the compensating lens and the converging lens. The lights emitted by the white light LED and the infrared laser source are combined through the dichroic wave plate and then focused on the end face of the guide light beam through the converging lens. The compensating lens is a meniscus lens.

[0006] By adopting this technical solution, through the compensating lens, the light path of the infrared laser is effectively adjusted, so that it is close to or reaches the required focusing state before entering the final converging lens, solves the problem of too long focal length of the infrared laser, and ensures that the infrared laser is focused on the focal plane slightly ahead of the visible light.

[0007] As a further improvement of the utility model, the refractive index of the compensating lens is 1.5 - 1.7. Preferably, in the 785 nm band, the refractive index of the compensating lens is 1.5 - 1.7.

[0008] As a further improvement of the utility model, the left surface of the compensating lens is concave, the right surface is convex, and the curvature of the left surface is greater than that of the right surface.

[0009] As a further improvement of the utility model, the curvature of the left surface is 1.08 - 1.15 times that of the right surface. By adopting this technical solution, the light path can be finely adjusted to play a compensating role. Further, the curvature of the left surface is 1.1 times that of the right surface.

[0010] As a further improvement of the present utility model, the curvature of the left surface is 2.777×10 -5 -3.846×10 -5 m -1 , and the radius is within 26 - 36 mm. The curvature of the right surface is 2.531×10 -5 -3.389×10 -5 m -1 , and the radius is 29.5 - 39.5 mm.

[0011] As a further improvement of the present utility model, the curvature of the left surface is 3.225×10 -5 m -1 , and the curvature of the right surface is 2.898×10 -5 m -1 .

[0012] As a further improvement of the present utility model, the sum of the distance between the axis of the right surface and the dichroic waveplate and the distance between the dichroic waveplate and the surface of the converging lens is 35 - 55 mm; more preferably, the sum of the distance between the axis of the right surface and the dichroic waveplate and the distance between the dichroic waveplate and the surface of the converging lens is 45 mm.

[0013] As a further improvement of the present utility model, the thickness of the meniscus lens is 5 - 30 mm.

[0014] As a further improvement of the present utility model, the diameter of the meniscus lens is 30 - 70 mm.

[0015] As a further improvement of the present utility model, the material of the meniscus lens is optical glass H-ZF2. With this technical solution, the refractive index of the meniscus lens is high, and the volume of the lens can be saved more.

[0016] As a further improvement of the present utility model, the emission light paths of the white light LED and the infrared laser source are parallel. A reflector is provided between the second collimating lens and the compensating lens. The reflector is located at the orthogonal position of the axes of the second collimating lens and the compensating lens, and forms a 45-degree angle with the light path emitted from the second collimating lens.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0018] Adopting the technical solution of the present utility model, the divergence angle of the infrared laser is synchronously adjusted to be consistent with the divergence angle of the visible light, ensuring the consistency of the light divergence of the two after being conducted by the light guide beam, avoiding the risk of melting of the inserted and pulled out light guide beam caused by the too long focal length of the infrared light, and improving the system safety; reducing the structural assembly difficulty brought about by directly increasing the lens size, and maintaining the compactness and beauty of the system. Description of the Drawings

[0019] Figure 1 It is a schematic optical path diagram of an infrared laser and visible light composite light source with synchronized divergence angles in the present utility model.

[0020] Figure 2 It is a schematic diagram of the meniscus lens in the embodiment of the present utility model.

[0021] Figure 3 It is a comparison of the optical paths of the present utility model with and without a compensation lens added.

[0022] Reference numerals include:

[0023] 1 - white light LED, 2 - first converging lens, 3 - first collimating lens, 4 - infrared laser source, 5 - beam expander lens, 6 - second collimating lens, 7 - mirror, 8 - compensation lens, 9 - dichroic waveplate, 10 - converging lens, 11 - light guide beam; 81 - left surface, 82 - right surface. Specific embodiments

[0024] The following further describes in detail the preferred embodiments of the present utility model in conjunction with the accompanying drawings.

[0025] As Figures 1 to 3 shown, an infrared laser and visible light composite light source with synchronized divergence angles includes a white light LED 1, an infrared laser source 4, a dichroic waveplate 9, a converging lens 10, and a light guide beam 11. A first converging lens 2 and a first collimating lens 3 are successively provided on the optical path of the white light LED 1. A beam expander lens 5, a second collimating lens 6, and a compensation lens 8 are successively provided on the optical path of the infrared laser source 4. The dichroic waveplate 9 is inclined. One surface of the dichroic waveplate 9 faces the first collimating lens 3, and the other surface faces the compensation lens 8 and the converging lens 10. After the light emitted by the white light LED 1 and the infrared laser source 4 is combined by the dichroic waveplate 9, it is focused by the converging lens 10 onto the end face of the light guide beam 11.

[0026] The outgoing optical paths of the white light LED 1 and the infrared laser source 4 are parallel. A mirror 7 is provided between the second collimating lens 6 and the compensation lens 8. The mirror 7 is located at the orthogonal position of the axes of the second collimating lens 6 and the compensation lens 8 and forms a 45-degree angle with the optical path exiting the second collimating lens 6. The mirror 7 is parallel to the dichroic waveplate 9.

[0027] The compensation lens 8 is a meniscus lens. The material of the meniscus lens is optical glass H-ZF2. The refractive index of the compensation lens 8 is 1.5 - 1.7. The left surface 81 of the compensation lens 8 is concave, and the right surface 82 is convex. The curvature of the left surface 81, i.e., the concave surface, is 2.777×10 -5 -3.846×10 -5 m -1; The curvature of the right surface 82, i.e., the convex surface, is 2.531×10 -5 -3.389×10 -5 m -1 , and the curvature of the left surface is 1.08 - 1.15 times that of the right surface, which plays a role in fine-tuning the optical path. In this embodiment, the curvature of the left surface is 3.225×10 -5 m -1 , and the curvature of the right surface is 2.898×10 -5 m -1 . Further, the thickness of the meniscus lens is 5 - 30 mm. In this embodiment, the thickness of the meniscus lens is 15 mm. The distance between the right surface 82 and the dichroic wave plate 9 is 20 mm; the distance between the dichroic wave plate 9 and the left surface of the converging lens 10 is 25 mm.

[0028] Among them, the white light LED 1 serves as a visible light source. The first converging lens 2 preliminarily converges the light emitted by the white light LED 1. The first collimating lens 3 further collimates the converged white light. The infrared laser source 4 provides an infrared laser light source. The beam expander lens 5 expands the infrared laser to match the subsequent optical path. The second collimating lens 6 collimates the expanded infrared laser. The mirror 7 adjusts the optical path direction of the infrared laser so that it is parallel or coincident with the white light optical path. The compensation lens 8 is a specially designed lens used to compensate for the focal length difference caused by the wavelength difference between the infrared laser and the visible light, ensuring that both are focused on the same focal plane. The dichroic wave plate 9 is used to combine the optical paths of the infrared laser and the visible light. The converging lens 10 simultaneously focuses the infrared laser and the visible light onto the end face of the light guide beam 11. The light guide beam 11 is used to transmit the focused light to the target area.

[0029] The optical paths with and without adding the compensation lens 8 are as Figure 3 shown. The solid line represents without adding the compensation lens, and the dashed line represents adding the compensation lens 8. It can be seen that by adding the compensation lens 8, the infrared laser can be focused slightly in front of the visible light focal plane, meeting the purpose.

[0030] In the technical solution of the present invention, a compensation lens 8 is added to the infrared laser path. Through its specific design, the optical path of the infrared light is effectively adjusted so that it is close to or reaches the required focusing state before entering the final converging lens 10. This design solves the problem of too long focal length of the infrared light without affecting the overall structural compactness, ensures that the infrared laser is focused slightly in front of the visible light focal plane, and prevents the risk of burning of the light guide beam 11.

[0031] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0033] In the present utility model, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] The above-described specific embodiments are the preferred embodiments of the present utility model, and do not limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to this specific embodiment. Any equivalent changes made according to the shape and structure of the present utility model are within the protection scope of the present utility model.

Claims

1. An infrared laser and visible light composite light source with synchronized divergence angles, characterized in that: It includes a white light LED, an infrared laser source, a dichroic wave plate, a converging lens and a light guide beam. A first converging lens and a first collimating lens are sequentially arranged on the optical path of the white light LED. A beam expander lens, a second collimating lens and a compensating lens are sequentially arranged on the optical path of the infrared laser source. The dichroic wave plate is inclined. One side of the dichroic wave plate faces the first collimating lens, and the other side faces the compensating lens and the converging lens. The lights emitted by the white light LED and the infrared laser source are combined through the dichroic wave plate and then focused by the converging lens onto the end face of the light guide beam. The compensating lens is a meniscus lens.

2. The infrared laser and visible light composite light source with synchronized divergence angle according to claim 1, wherein: The refractive index of the compensating lens is 1.5 - 1.

7.

3. The infrared laser and visible light composite light source with synchronized divergence angles according to claim 2, wherein: The left surface of the compensating lens is concave, and the right surface is convex. The curvature of the left surface is greater than that of the right surface.

4. The infrared laser and visible light composite light source with synchronized divergence angle according to claim 3, characterized in that: The curvature of the left surface is 2.777×10 -5 -3.846×10 -5 m -1 , and the curvature of the right surface is 2.531×10 -5 -3.389×10 -5 m -1 .

5. The infrared laser and visible light composite light source with synchronized divergence angle according to claim 4, characterized in that: The sum of the distance between the axis of the right surface and the dichroic wave plate and the distance between the dichroic wave plate and the surface of the converging lens is 35 - 55 mm.

6. The infrared laser and visible light composite light source with synchronized divergence angles according to claim 4, characterized in that: The thickness of the meniscus lens is 5 - 30 mm.

7. The infrared laser and visible light composite light source with synchronized divergence angles according to claim 2, characterized in that: The material of the meniscus lens is optical glass H-ZF2.

8. The infrared laser and visible light composite light source with synchronized divergence angle according to any one of claims 1 to 7, characterized in that: The emission optical paths of the white light LED and the infrared laser source are parallel. A reflector is arranged between the second collimating lens and the compensating lens. The reflector is located at the orthogonal position of the axes of the second collimating lens and the compensating lens and is at 45 degrees to the optical path emitted by the second collimating lens.

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