Coaxial collinear visual inspection device and application method thereof

Abstract

The invention discloses a coaxial collinear visual inspection device and an application method thereof, the coaxial collinear visual inspection device comprises a light source frame, the light source frame is provided with a line scanning camera unit, a light source unit and a light guide channel unit, the light guide channel unit comprises a light guide channel structure, and the light guide channel structure is provided with a light inlet end and a light outlet end; the light source unit is installed at the light inlet end of the light guide channel unit, a lens structure is arranged on the inner side of the light guide channel structure, the lens structure is detachably connected with the light guide channel structure, and the position of the lens structure in the light guide channel structure can be detachably adjusted; the light guide channel unit is detachably connected with the light source frame, and the position of the light guide channel unit on the light source frame can be detachably adjusted; the light source frame is provided with a semi-reflecting and semi-transmitting lens, and the semi-reflecting and semi-transmitting lens obliquely faces the light outlet end of the light guide channel structure and obliquely faces the light inlet end of the line scanning camera unit. According to the invention, the lighting accuracy of the line scanning camera during visual detection can be improved.

Description

Technical Field

[0001] This application relates to the field of visual detection technology, and particularly to a coaxial and collinear visual detection device and its application method. Background Art

[0002] Visual detection is one of the most commonly used detection methods in the industrial field at present. By combining with methods such as deep learning, it can efficiently and accurately identify defects on the surface of parts. Among the cameras for visual detection, there are usually line scan cameras and area scan cameras. The area scan camera is used to photograph static products. After the product moves under the area scan camera, the area scan camera takes a picture and is analyzed by the detection system. The line scan camera takes a column at a time. When the product moves, a complete photo can be composed. Since the shooting range of each picture taken by the line scan camera is small, more precise lighting is required during lighting to increase the brightness within the line scan area, thereby improving the quality of the picture and detection.

[0003] However, during the adjustment of the conventional detection light source, due to production accuracy and debugging problems, it is very difficult to accurately project linear light within the camera's field of view, resulting in an unsatisfactory lighting effect. Summary of the Invention

[0004] In order to improve the lighting accuracy during visual detection using a line scan camera, this application provides a coaxial and collinear visual detection device and its application method.

[0005] The coaxial and collinear visual detection device and its application method provided by this application adopt the following technical solutions: A coaxial and collinear visual detection device includes a light source frame, which is provided with a line scan camera unit, a light source unit, and a light guide channel unit; the light guide channel unit includes a light guide channel structure, the light guide channel structure has a light incident end and a light exit end, and the orientation of the light exit end of the light guide channel structure is perpendicular to the light incident direction of the line scan camera unit; the light source unit is installed at the light incident end of the light guide channel unit, a lens structure is provided inside the light guide channel structure, the lens structure is detachably connected to the light guide channel structure, and the position of the lens structure within the light guide channel structure can be disassembled, assembled, and adjusted; the light guide channel unit is detachably connected to the light source frame, the position of the light guide channel unit on the light source frame can be disassembled, assembled, and adjusted, and the position movement trajectory of the light guide channel unit is perpendicular to the length direction of the line scan area of the line scan camera unit; the light source frame is provided with a semi-reflective and semi-transmissive lens, and the semi-reflective and semi-transmissive lens is inclined towards the light exit end of the light guide channel structure and inclined towards the light incident end of the line scan camera unit.

[0006] By adopting the above technical solution, when the vision detection device works, after the light emitted by the light source unit enters the light guide channel structure, it is first converged by the lens structure, and then irradiates the semi-reflective and semi-transmissive lens from the light exit end of the light guide channel structure. When the light reaches the semi-reflective and semi-transmissive lens, part of it penetrates, and the other part is reflected onto the item to be detected. The item to be detected then reflects the light back through the semi-reflective and semi-transmissive lens to the line scan camera unit, enabling the line scan camera unit to obtain the image information of the item under test.

[0007] Before using the vision detection device, first adjust the position of the light guide channel unit to make the light reflected from the item under test move relative to the line scan camera unit, align the light with the line scan area of the line scan camera unit, and then refix the light guide channel unit. The distance at which the light irradiates the semi-reflective and semi-transmissive lens also changes, so the focusing position of the light also needs to be adjusted. By adjusting the position of the lens structure to focus the light path, after refocusing, fix the position of the lens structure. By adjusting the positions of the light guide channel structure and the lens structure, the light can be projected onto the line scan camera unit more precisely, which is beneficial to improving the clarity of vision detection.

[0008] Optionally, the light inlet end and the light outlet end of the light guide channel structure are perpendicular to each other, and a reflective sheet is provided inside the light guide channel structure. The reflective sheet is used to reflect the light of the light source unit out of the light outlet end of the light guide channel structure.

[0009] By adopting the above technical solution, by setting the reflective sheet, the light inlet end and the light outlet end of the light guide channel structure can be perpendicular, making the light guide channel structure more compact.

[0010] Optionally, the light source is provided with a curved light guide channel, which is located on the side of the semi-reflective and semi-transmissive lens away from the reflective sheet. The curved light guide channel is used to receive the light that penetrates the semi-reflective and semi-transmissive lens and direct the light obliquely to the item to be detected.

[0011] By adopting the above technical solution, the curved light guide channel can direct the light that penetrates the semi-reflective and semi-transmissive lens to the item to be detected, which is beneficial to improving the utilization rate of the light of the light source unit.

[0012] Optionally, the cross-section of the curved light guide channel is rectangular, and the length direction of the rectangular cross-section of the curved light guide channel is parallel to the length direction of the line scan area of the line scan camera unit.

[0013] By adopting the above technical solution, setting the cross-section of the curved light guide channel to be rectangular can adapt to the line scan area of the line scan camera unit, which is beneficial to making full use of the light.

[0014] Optionally, the width of the rectangular cross-section of the curved light guide channel gradually decreases in the direction away from the semi-reflective and semi-transmissive lens.

[0015] By adopting the above technical solution, the cross-sectional area of one end of the bent light guide channel close to the semi-reflective and semi-transmissive lens is relatively large, which can fully receive the light penetrating the semi-reflective and semi-transmissive lens; the cross-sectional area of the bent light guide channel gradually decreases along the direction away from the semi-reflective and semi-transmissive lens, which can make the light gradually converge and then emit in the bent light guide channel, facilitating the concentration of the light.

[0016] Optionally, the light source is provided with a long rectangular detection hole, the center of the detection hole is aligned with the center of the line scan camera unit, the length direction of the detection hole is consistent with the length direction of the line scan area of the line scan camera unit, and photosensitive devices are respectively arranged at the edges of the two long sides of the detection hole.

[0017] By adopting the above technical solution, the light emitted from the light-emitting end of the light guide channel structure moves on the semi-reflective and semi-transmissive lens, making the light reflected from the item under test to the line scan camera unit move relative to the line scan camera unit. Since the brightness at the center of the light irradiation area is greater than that of the surrounding area, when the center of the light irradiation area is aligned with the center of the detection hole, the light intensities sensed by the photosensitive devices on both sides of the detection hole are close, so that by combining the photosensitive devices, the lighting accuracy can be judged more precisely.

[0018] Optionally, the light source is provided with a long rectangular detection hole, the center of the detection hole is aligned with the center of the line scan camera unit, the length direction of the detection hole is consistent with the length direction of the line scan area of the line scan camera unit, and a photosensitive device is arranged at the edge of the short side of the detection hole, and the photosensitive device is centrally arranged on the short side of the detection hole.

[0019] By adopting the above technical solution, the photosensitive device can sense the light irradiated by the light source device onto the item under test. When the center of the light irradiation area is aligned with the center of the detection hole, the light intensity sensed by the photosensitive device is the largest, so that by combining the photosensitive device, the lighting accuracy can be judged more precisely.

[0020] Optionally, the lens structure and the light guide channel structure are connected by a first bolt. The light guide channel structure is provided with a first kidney-shaped hole for the first bolt to pass through, and the length direction of the first kidney-shaped hole is arranged along the length direction of the light guide channel structure; an adjusting rod is hinged to the outer side surface of the light guide channel structure. The adjusting rod is provided with a second kidney-shaped hole for the first bolt to pass through along its own length direction. The adjusting rod can drive the lens structure to move through the first bolt, and the adjusting rod is a labor-saving lever.

[0021] By adopting the above technical solution, when the first bolt is loosened, the lens structure can move inside the light guide channel structure. At this time, by rotating the adjustment rod, the lens structure can be driven to move, thereby achieving adjustment of the position of the lens structure. The adjustment rod is configured as a force-saving lever, so that the swing amplitude of the power arm of the adjustment rod is greater than the swing amplitude of the resistance arm, thereby facilitating more precise adjustment of the lens structure.

[0022] Optionally, a scale mark is provided on the outer side surface of the light guide channel structure, and a magnifying lens is provided on the end of the adjustment rod away from the first bolt, and the magnifying lens is used to see through the scale mark.

[0023] By adopting the above technical solution, the scale mark can be used to identify the position of the adjustment rod, thereby being used to judge the displacement change of the lens structure. The magnifying lens can magnify the scale mark to facilitate reading of higher-precision scale marks, thereby improving the position adjustment accuracy of the lens structure.

[0024] A method for applying a coaxial and collinear visual inspection device comprises the following steps: turning on a light source unit and a line scan camera unit; adjusting the position of a light guide channel unit so that the light from the light source unit coincides with the line scan area of the line scan camera unit; and adjusting the position of a lens structure to change the focus position and refocus the light path.

[0025] By adopting this technical solution, before using the visual inspection device, the position of the light guide unit is adjusted to align the light with the line scan area of the line scan camera unit. The distance between the light and the semi-reflective lens also changes, so the focus position of the light also needs to be adjusted. The light path is focused by adjusting the position of the lens structure.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By adjusting the position of the light guide channel structure and the lens structure, light can be projected more accurately onto the line scan camera unit, which is beneficial to improving the clarity of visual inspection.

[0027] 2. The photosensitive device can sense the light from the light source device to the object under test. By combining the photosensitive device, the lighting accuracy can be judged more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0029] Figure 2 It is a cross-sectional view of the overall structure of Example 1.

[0030] Figure 3 Schematic diagram of the structure of the focusing lens of Example 1.

[0031] Figure 4It is a sectional view of the overall structure of Embodiment 2.

[0032] Figure 5 It is a schematic diagram of the overall structure of Embodiment 2.

[0033] Figure 6 A sectional view of the overall structure of Embodiment 3.

[0034] Explanation of reference numerals: 1. Light source holder; 11. Detection hole; 2. Line scan camera unit; 3. Light source unit; 4. Light guide channel unit; 41. Light guide channel structure; 411. First kidney-shaped hole; 42. Reflective sheet; 43. Lens structure; 431. Lens mounting seat; 432. Condensing lens; 44. Sliding seat; 441. Screw; 442. Avoidance hole; 45. First bolt; 46. Adjusting rod; 461. Second kidney-shaped hole; 462. Magnifying lens; 47. Scale mark; 48. Condensing lens; 5. Half-reflective and half-transmissive lens; 6. Photosensitive device; 7. Curved light guide channel. Detailed implementation manners

[0035] The following further elaborates on this application Figures 1-5 with reference to the attached drawings.

[0036] Embodiment 1 An embodiment of this application discloses a coaxial and collinear vision detection device. Referring to Figure 1 , Figure 2 and Figure 3 , the coaxial and collinear vision detection device includes a light source holder 1, and the light source holder 1 is provided with a line scan camera unit, a light source unit 3 and a light guide channel unit 4; the light guide channel unit 4 includes a light guide channel structure 41, the light guide channel structure 41 has a light inlet end and a light outlet end, and the light inlet end and the light outlet end of the light guide channel structure 41 are perpendicular. The light source unit 3 is installed at the light inlet end of the light guide channel structure 41, and a reflective sheet 42 is provided inside the light guide channel structure 41, and the reflective sheet 42 is used to reflect the light of the light source unit 3 out of the light outlet end of the light guide channel structure 41; the orientation of the light outlet end of the light guide channel structure 41 is perpendicular to the light inlet direction of the line scan camera unit; the light source unit 3 is installed at the light inlet end of the light guide channel unit 4, and a condensing lens 48 is provided at the light outlet end of the light guide channel structure 41, the condensing lens 48 is a cylindrical array lens, and the condensing lens 48 can adjust the light into a line shape to adapt to the line scan camera, and a lens structure 43 is provided inside the light guide channel structure 41, and the lens structure 43 can focus the light.

[0037] Referring to Figure 2 , the light source holder 1 is provided with a half-reflective and half-transmissive lens 5, the half-reflective and half-transmissive lens 5 is inclined towards the light outlet end of the light guide channel structure 41 and also inclined towards the light inlet end of the line scan camera unit, and the half-reflective and half-transmissive lens 5 is parallel to the reflective sheet 42.

[0038] When the visual inspection device is working, the light emitted by the light source unit 3 enters the light guide channel structure 41, is first converged by the lens structure 43, and then reflected out of the light output end of the light guide channel structure 41 through the reflective sheet 42. The light is focused into a linear form by the focusing lens 48 from the light output end of the light guide channel structure 41 and then reaches the semi-reflective and semi-mirror sheet 5. When the light reaches the semi-reflective and semi-mirror sheet 5, part of it penetrates, and the other part is reflected onto the object to be inspected. The object to be inspected then reflects the linear light again through the semi-reflective and semi-mirror sheet 5 to the line scan camera unit, so that the line scan camera unit obtains image information of the object to be inspected.

[0039] Reference Figure 1 The light source frame 1 is provided with a long rectangular detection hole 11, which is used for the line scan camera unit to scan the object to be tested. The length direction of the detection hole 11 is consistent with the length direction of the line scan area of the line scan camera unit, and the center of the detection hole 11 is aligned with the center of the line scan camera unit.

[0040] Reference Figure 1 and Figure 2 The light guide channel structure 41 is provided with a sliding seat 44, which is slidably connected to the light source frame 1. The sliding direction between the sliding seat 44 and the light source frame 1 is perpendicular to the length direction of the line scan area of the line scan camera unit. The sliding seat 44 and the light source frame 1 are detachably connected via screws 441, so that the position of the light guide channel unit 4 on the light source frame 1 can be disassembled and adjusted. The screws 441 are threadedly connected to the light source frame 1, and the screws 441 are connected to the sliding seat 44 through a through hole. The sliding seat 44 is provided with an avoidance hole 442 for the screws 441 to pass through. When the light guide channel unit 4 is disassembled and adjusted, the avoidance hole 442 can avoid the screws 441.

[0041] Reference Figure 1 and Figure 2 The lens structure 43 includes a lens mounting seat 431 and a focusing lens 432. The focusing lens 432 is a convex lens, and the lens mounting seat 431 is a cylindrical structure. The lens mounting seat 431 is detachably connected to the light guide channel structure 41, so that the position of the lens structure 43 in the light guide channel structure 41 can be disassembled and adjusted. The lens mounting seat 431 and the light guide channel structure 41 are connected by a first bolt 45. The first bolt 45 is threadedly connected to the lens mounting seat 431 and is connected to the light guide channel structure 41 through a through-hole. The side wall of the light guide channel structure 41 is provided with a first waist-shaped hole 411 for avoiding the first bolt 45. The length direction of the first waist-shaped hole 411 is set along the length direction of the light guide channel structure 41.

[0042] The implementation principle of the coaxial collinear vision detection device according to the embodiments of the present application is as follows: Before using the vision detection device, first adjust the position of the light guide channel unit 4 so that the light reflected by the item to be measured moves relative to the line scan camera unit, align the light with the line scan area of the line scan camera unit, and then fix the light guide channel unit 4 again. Since the distance at which the light irradiates the semi-reflective semi-transparent lens 5 also changes, the focusing position of the light also needs to be adjusted. By adjusting the position of the lens structure 43, the optical path is focused. After refocusing, the position of the lens structure 43 is fixed. By adjusting the positions of the light guide channel structure 41 and the lens structure 43, the light can be projected onto the line scan camera unit more precisely, which is beneficial to improving the clarity of vision detection.

[0043] This embodiment also discloses an application method of the above coaxial collinear vision detection device, including the following steps: Step 1, turn on the light source unit 3 and the line scan camera unit; Step 2, adjust the position of the light guide channel unit 4 so that the light of the light source unit 3 coincides with the line scan area of the line scan camera unit; Step 3, adjust the position of the lens structure 43 to change the focusing position and refocus the optical path.

[0044] Embodiment 2 Referring to Figure 4 , the difference between this embodiment and Embodiment 1 is that photosensitive devices 6 are respectively provided at the edges of the two long sides of the detection hole 11. The photosensitive devices 6 are used to feedback the light intensity of the edge area of the detection hole 11. When the photosensitive devices 6 are used, they are electrically connected to the control system of the vision detection device, so that the control system of the vision detection device can collect light intensity data through the photosensitive devices 6.

[0045] When the center of the light irradiation area coincides with the center of the detection hole 11 when the vision detection device is in use, the light intensities sensed by the photosensitive devices 6 on both sides of the detection hole 11 are close. Therefore, by combining the photosensitive devices 6, the lighting accuracy can be judged more precisely.

[0046] In another implementation, the photosensitive devices 6 are provided at the edges of the short sides of the detection hole 11 and are centered on the edges of the short sides of the detection hole 11. When the center of the light irradiation area coincides with the center of the detection hole 11 when the vision detection device is in use, the light sensed by the photosensitive devices 6 is the strongest.

[0047] Embodiment 3 Referring to Figure 5, The difference between this embodiment and Embodiment 1 is that an adjusting rod 46 is hinged to the outer side of the light guide channel structure 41. The hinged connection of the adjusting rod 46 has frictional damping. A second waist-shaped hole 461 for the first bolt 45 to pass through is provided along the length direction of the adjusting rod 46. The position of the second waist-shaped hole 461 in the adjusting rod 46 is between the hinged part and the end away from the hinged part. The adjusting rod 46 can drive the lens structure 43 to move through the first bolt 45. During this process, the adjusting rod 46 is a labor-saving lever. A scale mark 47 is provided on the outer side of the light guide channel structure 41. An enlarged lens 462 is provided at one end of the adjusting rod 46 away from the first bolt 45. The enlarged lens 462 is used to view through the scale mark 47.

[0048] The principle of this embodiment is as follows: When adjusting the position of the lens structure 43, loosen the first bolt 45 so that the lens structure 43 can move inside the light guide channel structure 41. At this time, by rotating the adjusting rod 46, the lens structure 43 can be driven to move, so as to realize the adjustment of the position of the lens structure 43. The adjusting rod 46 is set as a labor-saving lever, so that the swing amplitude of the power arm of the adjusting rod 46 is greater than the swing amplitude of the resistance arm, which is beneficial to realizing more precise adjustment of the lens structure 43. The scale mark 47 with higher precision can be read through the enlarged lens 462, which is beneficial to improving the position adjustment precision of the lens structure 43.

[0049] Embodiment 4 Refer to Figure 6 , The difference between this embodiment and Embodiment 1 is that the light source holder 1 of the coaxial collinear vision detection device is provided with a bent light guide channel 7. The bent light guide channel 7 is located on the side of the semi-reflective semi-transmissive lens 5 away from the reflector 42. The bent light guide channel 7 is used to receive the light penetrating the semi-reflective semi-transmissive lens 5 and obliquely guide the light to the item to be measured.

[0050] The bent light-transmitting channel is a bent pipe with a mirror coating, or an optical conduction tool based on the principle of total internal reflection.

[0051] In this embodiment, the bent light-transmitting channel is specifically set as a bent pipe with a mirror coating. The bent light guide channel 7 is specifically set to have a rectangular cross-section. The length direction of the rectangular cross-section of the bent light guide channel 7 is parallel to the length direction of the line scan area of the line scan camera unit. The width of the rectangular cross-section of the bent light guide channel 7 gradually decreases along the direction away from the semi-reflective semi-transmissive lens 5.

[0052] The bent light guide channel 7 can guide the light penetrating the semi-reflective semi-transmissive lens 5 to the item to be measured, which is beneficial to improving the utilization rate of the light of the light source unit 3.

[0053] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A coaxial collinear vision detection device, characterized in that: It includes a light source holder (1), and the light source holder (1) is provided with a line scan camera unit (2), a light source unit (3) and a light guide channel unit (4); the light guide channel unit (4) includes a light guide channel structure (41), the light guide channel structure (41) has a light incident end and a light exit end, and the orientation of the light exit end of the light guide channel structure (41) is perpendicular to the light incident direction of the line scan camera unit (2); the light source unit (3) is installed at the light incident end of the light guide channel unit (4), a lens structure (43) is provided inside the light guide channel structure (41), the lens structure (43) is detachably connected to the light guide channel structure (41), and the position of the lens structure (43) inside the light guide channel structure (41) can be disassembled, adjusted; the light guide channel unit (4) is detachably connected to the light source holder (1), the position of the light guide channel unit (4) on the light source holder (1) can be disassembled and adjusted, and the position movement track of the light guide channel unit (4) is perpendicular to the length direction of the line scan area of the line scan camera unit (2); the light source holder (1) is provided with a semi-reflective and semi-transmissive lens (5), and the semi-reflective and semi-transmissive lens (5) is inclined towards the light exit end of the light guide channel structure (41) and is also inclined towards the light incident end of the line scan camera unit (2).

2. The coaxial collinear vision detection device according to claim 1, wherein: The light incident end and the light exit end of the light guide channel structure (41) are perpendicular to each other, a reflective sheet (42) is provided inside the light guide channel structure (41), the reflective sheet (42) is parallel to the semi-reflective and semi-transmissive lens (5), and the reflective sheet (42) is used to reflect the light of the light source unit (3) out of the light exit end of the light guide channel structure (41).

3. The coaxial collinear vision detection device according to claim 2, wherein: The light source holder (1) is provided with a curved light guide channel (7), the curved light guide channel (7) is located on the side of the semi-reflective and semi-transmissive lens (5) away from the reflective sheet (42), and the curved light guide channel (7) is used to receive the light penetrating the semi-reflective and semi-transmissive lens (5) and guide the light obliquely to the item to be measured.

4. The coaxial collinear vision detection device according to claim 3, characterized in that: The cross-section of the curved light guide channel (7) is rectangular, and the length direction of the rectangular cross-section of the curved light guide channel (7) is parallel to the length direction of the line scan area of the line scan camera unit (2).

5. The coaxial collinear vision detection device according to claim 4, wherein: The width of the rectangular cross-section of the curved light guide channel (7) gradually decreases along the direction away from the semi-reflective and semi-transmissive lens (5).

6. The coaxial collinear vision detection device according to claim 1, characterized in that: The light source holder (1) is provided with a long rectangular detection hole (11), the center of the detection hole (11) is aligned with the center of the line scan camera unit (2), the length direction of the detection hole (11) is consistent with the length direction of the line scan area of the line scan camera unit (2), and photosensitive devices (6) are respectively provided at the edges of the two long sides of the detection hole (11).

7. The coaxial collinear vision detection device according to claim 1, wherein: The light source holder (1) is provided with a long rectangular detection hole (11), the center of the detection hole (11) is aligned with the center of the line scan camera unit (2), the length direction of the detection hole (11) is consistent with the length direction of the line scan area of the line scan camera unit (2), a photosensitive device (6) is provided at the edge of the short side of the detection hole (11), and the photosensitive device (6) is centrally arranged on the short side of the detection hole (11).

8. A coaxial and collinear vision detection device according to claim 1, characterized in that: The lens structure (43) is connected to the light guide channel structure (41) by a first bolt (45), the light guide channel structure (41) is provided with a first kidney-shaped hole (411) for the first bolt (45) to pass through, and the length direction of the first kidney-shaped hole (411) is arranged along the length direction of the light guide channel structure (41); an adjusting rod (46) is hinged to the outer side surface of the light guide channel structure (41), a second kidney-shaped hole (461) for the first bolt (45) to pass through is formed along the length direction of the adjusting rod (46), the adjusting rod (46) can drive the lens structure (43) to move through the first bolt (45), and the adjusting rod (46) is a labor-saving lever.

9. The coaxial collinear vision detection device according to claim 8, wherein: A scale mark (47) is provided on the outer side surface of the light guide channel structure (41), and a magnifying lens (462) is provided at one end of the adjusting rod (46) away from the first bolt (45), and the magnifying lens (462) is used to view through the scale mark (47).

10. A method for applying a coaxial and collinear vision detection device according to any one of claims 1-9, characterized in that, It includes the following steps: Turn on the light source unit (3) and the line scan camera unit; Adjust the position of the light guide channel unit (4) so that the light of the light source unit (3) coincides with the line scan area of the line scan camera unit; Adjust the position of the lens structure (43) to change the focusing position and refocus the optical path.

Images