CN217329456U

CN217329456U - Multi-wavelength annular laser light source for visual inspection

Info

Publication number: CN217329456U
Application number: CN202220866476.3U
Authority: CN
Inventors: 朱兵兵; 陈秋白; 杨超慧
Original assignee: Sansui Optical Technology Suzhou Co ltd
Current assignee: Sansui Optical Technology Suzhou Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-08-30
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses a multi-wavelength ring laser light source for visual detection, expand the beam module, calculate holographic component DOE, beam shaping module, field lens and beam splitter including sensitization component and from left to right RGB laser light source module, cylindrical lens, Galileo of coaxial setting in proper order, the outgoing laser beam of RGB laser light source module is the white light, and Galileo expands the beam module and includes the positive lens and the negative lens of coaxial setting. The utility model discloses can replace traditional LED annular light source, the light beam after expanding through Galileo beam expanding module forms annular light source through calculating holographic element DOE, the light beam after handling through the field lens divide into two bundles of light through the beam splitter, one of them beam of light directive measured object and reflection receive to photosensitive element, compound eye lens through setting up field lens and vibration makes the illumination more even, can be used to the outward appearance detection of smooth plane product, Mark point location detects, PCB board circuit short circuit, defect detection such as open circuit.

Description

Multi-wavelength annular laser light source for visual inspection

Technical Field

The utility model belongs to the technical field of optics, concretely relates to multi-wavelength ring laser light source for visual detection.

Background

The vision inspection is to replace human eyes with the robot for measurement and judgment, the light source used in the vision inspection has great influence on the detection precision, and the light source structures used in different scenes are different. At present, most light sources used for visual detection are LED light sources, and the light sources have long service life, low energy consumption and high brightness, but are relatively limited in size and have certain limitation on illumination distance. For different application scenarios, LED light sources have different structural types, such as coaxial lighting, annular light source, and stripe lighting. When the visual inspection light source of the annular illumination structure is generally used, a plurality of LED light sources are combined into an annular array to obtain proper illumination brightness, and therefore, the volume of the light source is relatively increased.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem that exists among the prior art, the utility model aims to provide a multi-wavelength ring laser light source for visual detection.

In order to realize the above purpose, reach above-mentioned technological effect, the utility model discloses a technical scheme be:

the utility model provides a multi-wavelength annular laser light source for visual detection, includes photosensitive element and from left to right RGB laser light source module, cylindrical lens, Galileo expand the beam module, calculate holographic element DOE, beam shaping module, field lens and beam splitter of coaxial setting in proper order, Galileo expands the beam module and includes coaxial setting's positive lens and negative lens, and the beam after expanding through Galileo expand the beam module and form annular light source through calculating holographic element DOE, and the beam after handling through the field lens divides into two bundles of light through the beam splitter, and one of them beam of light is received to photosensitive element to measured object and reflection.

As a specific implementation scheme, the laser beam emitted by the RGB laser light source module is white light, and the diameter of the emitted light spot of the RGB laser light source module is 0.3-0.6 mm.

In a specific embodiment, the cylindrical lens is of a plano-convex type, the aperture is 25.4 × 25.4mm, and the focal length is 3-20 mm.

In a specific embodiment, the galilean beam expanding module comprises a negative lens and a positive lens which are coaxially arranged from left to right.

In a specific embodiment, the focal length of the negative lens is-1 to-15 mm, and the clear aperture is 4 to 10 mm.

In a specific embodiment, the focal length of the positive lens is 1-25 mm, and the clear aperture is 5-20 mm.

In a specific embodiment, the aperture of the computer-generated holographic element DOE is smaller than the diameter of the beam expanded by the galilean beam expanding module, and the aperture radius of the computer-generated holographic element DOE is larger than the ring radius of the annular light source.

In a specific embodiment, the ring radius of the ring-shaped light source is 3-10 mm, and the image-side numerical aperture of the ring-shaped light source is 0.2-0.6.

As a specific implementation, the beam shaping module includes a fly-eye lens and a vibrator for driving the fly-eye lens to vibrate, and the field lens is located at a focal plane of the fly-eye lens.

In a specific embodiment, the focal length of the fly-eye lens is 0.5 to 2mm, the object-side numerical aperture of the field lens is larger than the image-side numerical aperture of the fly-eye lens, and the object-side numerical aperture NA of the field lens is 0.3 to 0.6.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses a multi-wavelength annular laser light source for visual detection, including photosensitive element and from left to right RGB laser light source module of coaxial setting in proper order, cylindrical lens, Galileo expands the beam module, calculate holographic element DOE, beam shaping module, field lens and beam splitter, RGB laser light source module's emergent laser beam is white light, Galileo expands the beam module and includes the positive lens and the negative lens of coaxial setting, the beam after expanding through Galileo expands the beam module forms annular light source through calculating holographic element DOE, the beam after handling through the field lens divides into two bundles of light through the beam splitter directive, one of them light testee and reflection receive to photosensitive element. The utility model provides a multi-wavelength ring laser light source for visual detection, can replace traditional LED annular light source to realize annular lighting, DOE has obtained white light annular light source through setting up calculation holographic component, compound eye lens and cooperation field lens that can vibrate through the setting can make the illumination more even, the application adopts the structural scheme of coaxial illumination, can be used to the outward appearance of smooth plane product to detect, Mark point location detects, PCB board circuit short circuit, defect detection such as circuit break, overall structure is simple, the volume is less, luminance is higher, the directionality is better, be worth using widely.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a light spot illumination chart of the RGB laser light source module of the present invention;

FIG. 3 is a diagram of the front wave of the light beam passing through the Galileo beam expanding module;

fig. 4 is a schematic structural diagram of a fly-eye lens according to the present invention;

fig. 5 is a diagram of the illuminance distribution of the ring light source of the present invention.

Detailed Description

The present invention is described in detail below to enable the advantages and features of the present invention to be more easily understood by those skilled in the art, thereby making more clear and definite definitions of the scope of the present invention.

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

As shown in fig. 1-5, a multi-wavelength ring laser source for visual inspection includes an RGB laser source module 1, a cylindrical lens 2, a galileo beam expanding module 3, a computer holographic element DOE 4, a beam shaping module, a field lens 8 and a beam splitter 9, which are coaxially arranged from left to right, a white laser beam is emitted from the RGB laser source module 1, a fast axis or a slow axis of the beam emitted from the RGB laser source module 1 is shaped by the cylindrical lens 2 to obtain a light spot shape meeting requirements, the beam collimated by the cylindrical lens 2 is expanded by the galileo beam expanding module 3, the expanded beam passes through the computer holographic element DOE 4 to form a standard ring light source 5, the ring light source 5 can be regarded as being composed of numerous off-axis point light sources, the ring radius is set by actual conditions, and the image-side numerical aperture of each point light source is determined according to an application scene, the larger the image-side numerical aperture is, the larger the illumination area is, the light beam emitted by the annular light source 5 is subjected to light homogenizing and shaping through the light beam shaping module, the shaped light beam is subjected to secondary light homogenizing through the field lens 8 and then is divided into two light beams through the beam splitter 9, one light beam is emitted from left to right along the axis, the light beam is light which is not needed by people, the other light beam is emitted to the object 11 to be measured, and the reflected light beam with the object surface information is finally received by the CCD 10. The primary beam expansion ratio of the multi-wavelength annular laser light source is usually 5-20 times, and the curvature of the lens is not limited. The multi-wavelength annular laser light source adopts coaxial illumination, and can realize the appearance detection, Mark point positioning detection, PCB circuit short circuit, open circuit and other defect detection of smooth plane products.

The outgoing beam of the RGB laser light source module 1 is formed by combining the outgoing beams of three LD semiconductor lasers (R, G, B), the combined light is white light, the diameter of the outgoing spot is 0.3-0.6 mm, and the outgoing light of the three LD semiconductor lasers is red light, green light and blue light respectively. The RGB laser light source module 1 may be a conventional laser product capable of outputting white light.

Fig. 2 is a light spot illuminance diagram emitted by the RGB laser light source module 1, and the emitted light spot is an ellipse, because the divergence angles of the fast and slow axes of the laser are different, the light spot can be shaped according to different measurement requirements when the laser is applied.

The cylindrical lens 2 is plated with an antireflection film, the cylindrical lens 2 is of a plano-convex shape, the caliber of the cylindrical lens is 25.4 multiplied by 25.4mm, the focal length of the cylindrical lens is 3-20 mm, the fast axis of the light beam emitted from the RGB laser light source module 1 is collimated, the light beam emitted from the RGB laser light source module 1 only needs to be collimated by the cylindrical lens 2 through the slow axis, and therefore the light spot shape meeting the requirements is obtained.

The galilean beam expanding module 3 adopts a galilean structure and comprises a positive lens and a negative lens, preferably, the front lens of the galilean beam expanding module 3 is a negative lens, the rear lens is a positive lens, the focal length of the negative lens is f-1 to-15 mm, the clear aperture is 4 to 10mm, the focal length of the positive lens is f-1 to 25mm, and the clear aperture is 5 to 20 mm. The positive lens and the negative lens may be spherical or spherical lenses, respectively. Subsequently, an aspheric lens combination can be adopted for obtaining a better collimated light beam Galileo beam expanding module 3.

The hole type of the calculation holographic element DOE 4 is circular, the aperture is smaller than the diameter of the expanded beam, the hole radius of the calculation holographic element DOE 4 is larger than the ring radius of the annular light source 5, the ring radius of the annular light source 5 is determined by the diameter of the expanded beam and is generally 3-10 mm, the image-side numerical aperture of the annular light source 5 is larger than 0.3, preferably 0.2-0.6, and the specific radius size and the exit angle are determined by the actual application scene. Setting the ring radius to 5mm, the size of the computational hologram element DOE 4 can be 6 x 6mm rectangular aperture.

The light beam shaping module comprises a fly-eye lens 6 and a vibrator 7, the focal length of the fly-eye lens 6 is small and is 1mm, the fly-eye lens 6 is mechanically connected with the vibrator 7, if the fly-eye lens 6 can be placed in the vibrator 7, the vibrator 7 drives the fly-eye lens 6 to vibrate, light beams emitted by the annular light source 5 are homogenized and shaped through the fly-eye lens 6, the fly-eye lens 6 is an array formed by a plurality of spherical or aspherical positive micro lenses, the length and the width of the array and the caliber type of each lens can be flexibly adjusted according to practical application, and the caliber type of the fly-eye lens 6 can be set to any type according to practical requirements, such as a circle, a rectangle or a hexagon.

The field lens 8 is located at the focal plane of the fly-eye lens 6 or the objective lens, and has the function of homogenizing the non-uniform illumination on the receiving surface of the CCD 10, the object-side numerical aperture of the field lens 8 is larger than the image-side numerical aperture of the fly-eye lens 6, and the numerical aperture NA of the field lens 8 is usually 0.3-0.6.

The utility model discloses the part or the structure that do not specifically describe adopt prior art or current product can, do not do here and describe repeatedly.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.

Claims

1. The utility model provides a multi-wavelength annular laser light source for visual detection, its characterized in that, includes photosensitive element and from left to right RGB laser light source module, cylindrical lens, Galileo expand the beam module, calculate holographic element DOE, beam shaping module, field lens and beam splitter of coaxial setting in proper order, Galileo expands the beam module and includes the positive lens and the negative lens of coaxial setting, and the beam after expanding through Galileo expands the beam module forms annular light source through calculating holographic element DOE, and the beam after handling through the field lens divides into two bundles of light through the beam splitter, and one of them light directive testee is received to photosensitive element reflection.

2. The multi-wavelength ring laser source for visual inspection as claimed in claim 1, wherein the outgoing laser beam of the RGB laser source module is white light, and the outgoing spot diameter of the RGB laser source module is 0.3-0.6 mm.

3. The multiple wavelength ring laser source for visual inspection as claimed in claim 1, wherein said cylindrical lens is of plano-convex type with a bore diameter of 25.4 x 25.4mm and a focal length of 3-20 mm.

4. The multi-wavelength ring laser source for visual inspection as claimed in claim 1, wherein said Galileo beam expanding module comprises a negative lens and a positive lens coaxially arranged in sequence from left to right.

5. The multi-wavelength ring laser light source for visual inspection as claimed in claim 4, wherein the negative lens has a focal length of-1 to-15 mm and a clear aperture of 4 to 10 mm.

6. The multi-wavelength ring laser light source for visual inspection as claimed in claim 4, wherein the positive lens has a focal length of 1-25 mm and a clear aperture of 5-20 mm.

7. The multi-wavelength ring laser source for visual inspection as claimed in claim 1, wherein the aperture of said computing holographic element DOE is smaller than the diameter of the beam after being expanded by galilean beam expanding module, and the aperture radius of the computing holographic element DOE is larger than the ring radius of the ring source.

8. The multi-wavelength ring laser source for visual inspection according to claim 7, wherein the ring radius of the ring light source is 3-10 mm, and the image-side numerical aperture of the ring light source is 0.2-0.6.

9. The multi-wavelength ring laser source for visual inspection according to claim 1, wherein the beam shaping module comprises a fly eye lens and a vibrator for driving the fly eye lens to vibrate, and the field lens is located at a focal plane of the fly eye lens.

10. The multi-wavelength ring laser source for visual inspection as claimed in claim 9, wherein the focal length of said fly-eye lens is 0.5-2 mm, the object-side numerical aperture of said field lens is larger than the image-side numerical aperture of said fly-eye lens, and the object-side numerical aperture NA of said field lens is 0.3-0.6.