Slit light source device and visual inspection mechanism

Abstract

The embodiment of the utility model discloses a slit light source device and a visual inspection mechanism, which are used for solving the technical problem of poor imaging effect caused by the fact that the existing light source device cannot fully irradiate the bottom of a slit of a workpiece. The embodiment of the utility model comprises an outer shell, a light source body and a light guide mirror, a containing cavity is formed in the outer shell, the light source body is arranged in the containing cavity, the light guide mirror is fixed to the outer shell, a light inlet part of the light guide mirror extends into the containing cavity and is located at the light outlet end of the light source body, and a light outlet part of the light guide mirror is exposed out of the outer shell. And two opposite side surfaces of the light guide mirror are fully reflecting surfaces.

Description

Technical Field

[0001] The utility model relates to the technical field of light source devices, in particular to a slit light source device and a vision detection mechanism. Background Art

[0002] The detection of existing workpieces is generally completed by a vision detection mechanism. The vision detection mechanism specifically includes a detection camera module and a light source device. Among them, the light source device is used to emit illuminating light onto the surface to be measured of the workpiece, and the detection camera module is used to obtain the light reflected from the surface to be measured to form an image.

[0003] At present, for the vision detection of workpieces with slits, a traditional linear light source device is still used. This type of light source device emits linear light and irradiates it onto the slits of the workpiece. Since the slits of the workpiece are usually narrow, most of the linear light emitted by the light source device only irradiates the two sides of the slit opening, and it is difficult for the light to reach the bottom of the slit, resulting in incomplete imaging and the technical problem that the workpiece cannot be accurately detected.

[0004] Therefore, finding a technical solution that can solve the above technical problems has become an important research topic for those skilled in the art. Summary of the Utility Model

[0005] The embodiments of the utility model disclose a slit light source device and a vision detection mechanism, which are used to solve the technical problem that the existing light source device cannot fully irradiate the bottom of the slit of the workpiece, resulting in poor imaging effect.

[0006] The embodiments of the utility model provide a slit light source device, including an outer housing, a light source body, and a light guide mirror;

[0007] A receiving cavity is arranged in the outer housing. The light source body is arranged in the receiving cavity. The light guide mirror is fixed to the outer housing. The light incident part of the light guide mirror extends into the receiving cavity. The light incident part is located at the light emitting end of the light source body. The light emitting part of the light guide mirror is exposed outside the outer housing. The opposite side surfaces of the light guide mirror are total reflection surfaces.

[0008] Optionally, reflective films are plated on the opposite side surfaces of the light guide mirror to form the total reflection surfaces.

[0009] Optionally, the light guide mirror is of a flat plate-like structure.

[0010] Optionally, the light source body is an LED light board.

[0011] Optionally, the LED light board includes a PCB board and at least one LED lamp bead electrically connected to the PCB board.

[0012] Optionally, the cross-section of the light incident part of the light guide mirror is an inverted trapezoidal structure.

[0013] An embodiment of the present invention provides a vision detection mechanism, including a detection camera, a lens connected to the detection camera, and the above-mentioned slit light source device.

[0014] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0015] The slit light source device in this embodiment is mainly aimed at workpieces with slits. The light source body conducts light through the light guide mirror and can directly irradiate the bottom of the slit. The opposite side surfaces of the light guide mirror are total reflection surfaces, enabling total internal reflection of light within the light guide mirror. The light output has high brightness and a narrow and thin light output surface, effectively reducing the interference of diffracted light and making the illumination at the bottom of the slit more uniform. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic structural diagram of a slit light source device provided by an embodiment of the present invention;

[0018] Figure 2 It is another perspective structural diagram of a slit light source device provided by an embodiment of the present invention;

[0019] Illustration: Outer housing 1; Accommodation cavity 101; Light source body 2; PCB board 201; LED lamp bead 202; Light guide mirror 3; Light incident part 301; Light output part 302; Total reflection surface 303. Detailed Embodiments

[0020] An embodiment of the present invention discloses a slit light source device and a vision detection mechanism, which are used to solve the technical problem that the existing light source device cannot fully irradiate the bottom of the slit of the workpiece, resulting in poor imaging effects.

[0021] In order to enable those skilled in the art to better understand the solution of the present invention, the following will further describe the present invention in detail with reference to the drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Please refer to Figure 1 and Figure 2 A slit light source device provided by an embodiment of the present utility model includes a housing 1, a light source body 2, and a light guide mirror 3;

[0023] A receiving cavity 101 is provided in the housing 1, the light source body 2 is disposed in the receiving cavity 101, the light guide mirror 3 is fixed to the housing 1, a light incident portion 301 of the light guide mirror 3 extends into the receiving cavity 101, the light incident portion 301 is located at a light emitting end of the light source body 2, a light emitting portion 302 of the light guide mirror 3 is exposed outside the housing 1, and opposite side surfaces of the light guide mirror 3 are total reflection surfaces 303.

[0024] The slit light source device in this embodiment is mainly directed at a workpiece with a slit. The light emitted by the light source body 2 can be directly guided to the bottom of the slit through the light guide mirror 3. The opposite side surfaces of the light guide mirror 3 are total reflection surfaces 303, so that light undergoes total internal reflection in the light guide mirror 3, the light emitting brightness is high, the light emitting surface is narrow, the interference of diffracted light is effectively reduced, and the illumination at the bottom of the slit is more uniform.

[0025] Furthermore, reflection films are plated on the opposite side surfaces of the light guide mirror 3 in this embodiment to form the total reflection surfaces 303.

[0026] It should be noted that through the above design, the light emitted by the light source body 2 can achieve total internal reflection in the light guide mirror 3, the light emitting brightness is higher, the light emitting surface is narrow and effective, the interference of diffracted light is effectively reduced, and the illumination at the bottom of the slit is more uniform.

[0027] Furthermore, the light guide mirror 3 in this embodiment has a flat plate-like structure.

[0028] It should be noted that the specific structure of the light guide mirror 3 in this embodiment can be designed according to the size of the slit of the workpiece, and the light guide mirror 3 is preferably the above flat plate-like structure.

[0029] Furthermore, the light source body 2 in this embodiment is an LED light board.

[0030] Specifically, the LED light board includes a PCB board 201 and at least one LED lamp bead 202 electrically connected to the PCB board 201.

[0031] It should be noted that the specific number of the LED lamp beads 202 is not limited in this embodiment, and designers can select an appropriate number of LED lamp beads 202 according to actual situations.

[0032] Furthermore, the cross section of the light incident portion 301 of the light guide mirror 3 in this embodiment has an inverted trapezoidal structure.

[0033] It should be noted that the surface area of the light incident part 301 with an inverted trapezoidal structure near the end face of the light source body 2 is larger than the surface area of the end face far from the light source body 2, that is, the top surface area of the light incident part 301 is larger. Through the above design, the light incident part 301 can be fully irradiated by the light source body 2 as much as possible.

[0034] Please refer to Figure 1 and Figure 2 , a vision detection mechanism provided by an embodiment of the present invention includes a detection camera, a lens connected to the detection camera, and the above slit light source device.

[0035] It should be noted that taking a workpiece with a slit as an example, the slit light source device in this embodiment generates narrow light that fully irradiates the bottom of the slit of the workpiece, and the light is reflected from the bottom of the slit to the lens and the detection camera, thereby forming an image.

[0036] The above has introduced in detail a slit light source device and a vision detection mechanism provided by the present invention. For those of ordinary skill in the art, according to the idea of the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A slit light source device, characterized in that, It includes an outer housing (1), a light source body (2), and a light guide mirror (3). An accommodation cavity (101) is provided inside the outer housing (1). The light source body (2) is disposed inside the accommodation cavity (101). The light guide mirror (3) is fixed to the outer housing (1). The light incident portion (301) of the light guide mirror (3) extends into the accommodation cavity (101). The light incident portion (301) is located at the light emitting end of the light source body (2). The light emitting portion (302) of the light guide mirror (3) is exposed outside the outer housing (1). The opposite side surfaces of the light guide mirror (3) are total reflection surfaces (303).

2. The slit light source device according to claim 1, characterized in that, Reflection films are plated on the opposite side surfaces of the light guide mirror (3) to form the total reflection surfaces (303).

3. The slit light source device according to claim 1, characterized in that The light guide mirror (3) is of a flat plate-like structure.

4. The slit light source device according to claim 1, wherein The light source body (2) is an LED light board.

5. The slit light source device according to claim 4, wherein The LED light board includes a PCB board (201) and at least one LED lamp bead (202) electrically connected to the PCB board (201).

6. The slit light source device according to claim 1, characterized in that, The cross-section of the light incident portion (301) of the light guide mirror (3) is of an inverted trapezoid structure.

7. A visual inspection mechanism, characterized in that It includes a detection camera, a lens connected to the detection camera, and a slit light source device according to any one of claims 1 to 6.

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