Light source assembly with assembly positioning structure and contact type image sensor thereof
By introducing anti-detachment parts and barbed structures into the light source assembly, the problem of sliding and bending detachment of the light guide column during assembly is solved, achieving stable installation of the light source assembly and improving light uniformity, thereby increasing the production efficiency and yield of contact image sensors.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DUNNAN TECH WUXI LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-08
AI Technical Summary
Existing LED light source modules are prone to sliding and bending during assembly, resulting in poor light uniformity and affecting the assembly efficiency and yield of contact image sensors.
A light source assembly with an assembly positioning structure was designed. By setting anti-detachment parts and barbs on the white shell, combined with stop parts and slots, the light guide column is ensured to be stably assembled with the white shell, preventing the light guide column from moving or bending and detaching in the XY direction.
It improves the assembly efficiency and stability of the light source components, ensures light uniformity, reduces bright spot fluctuations, enhances the production efficiency and yield of contact image sensors, and saves labor costs.
Smart Images
Figure CN224218458U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sensor equipment technology, and more specifically to a light source assembly with an assembly and positioning structure and its contact image sensor. Background Technology
[0002] The internal structure of a contact image sensor contains an LED light source module that illuminates the object being measured, making the image information received when the image is fed back to the sensing sensor clearer and more complete.
[0003] During normal lighting, a high-brightness LED light source is required to effectively and clearly display the object under test. Therefore, a transparent acrylic light guide (or light post) is typically included in the light source architecture. A white shell is inserted into the light guide, which protects the light guide and enhances its luminous efficiency. LED panels are then attached to one or both ends, forming a complete light source module with high luminous efficiency. The white shell and light guide are separate components; assembly involves pushing the light guide into the white shell from the side, and then attaching the LED panel to the end. During assembly on the production line, whether using a robotic arm or manual transfer to the next processing station, the white shell and light guide can easily slip, causing displacement of the two components and resulting in a shift in optical curvature. If the light guide slips, it will not reach the left end of the white shell, leading to decreased brightness and uneven light uniformity on the left side. Figure 1 As shown; and the light guide column is easily detached from the white shell after bending, such as Figure 2 As shown, if the light guide column is bent, arched in the middle, and detached from the white shell, it will cause insufficient light uniformity, such as... Figure 3 As shown.
[0004] Therefore, the architecture of the aforementioned LED light source module needs further optimization to facilitate process improvement and increase product yield. Utility Model Content
[0005] To address the aforementioned issues, this invention provides a light source assembly with an assembly and positioning structure that ensures the light guide column is properly assembled with the white shell and prevents the light guide column from bending and detaching from the white shell. This light source assembly, when applied to a contact image sensor, improves light uniformity.
[0006] According to one aspect of this utility model, a light source assembly with an assembly positioning structure is provided, including a white shell, a light guide column, and an LED light panel assembly. The white shell and the light guide column are strip-shaped structures extending along their length. The white shell has a long light outlet, and both ends of the white shell have light inlets. The light guide column is inserted into the white shell through the light inlets. The LED light panel assembly is installed at the ends of the white shell. Both ends of the white shell have anti-detachment parts, and the light outlet is located between the anti-detachment parts at both ends. The white shell and the anti-detachment parts surround both ends of the light guide column. Multiple barbs are evenly distributed on the edge of the light outlet, and the barbs block the edge of the light guide column. Thus, the light guide column is slid sideways into the white shell, and both ends of the light guide column are restricted within the white shell by the anti-detachment parts. The evenly distributed barbs on the white shell can prevent the middle part of the light guide column from bending and detaching from the white shell.
[0007] In some embodiments, one end of the light guide post is provided with a stop portion that protrudes outward relative to the side of the light guide post. One of the light inlets of the white shell is an insertion end with a slot, into which the stop portion can be inserted. Thus, after the light guide post slides into the white shell, the stop portion of the light guide post is inserted into the slot of the white shell, which prevents the light guide post from sliding relative to the white shell in the length direction and also prevents the light guide post from moving relative to the white shell in the width direction, ensuring that the light guide post is installed in place.
[0008] In some embodiments, there are two stops, and the two stops are symmetrically arranged with respect to the axial center line of the light guide post, and there are correspondingly two slots. Thus, the symmetrical arrangement of the stops and slots can make the positioning of the light guide post more stable.
[0009] In some implementations, the light guide post is assembled inside the housing, with one side of the light outlet lower than the light guide post and the other side higher than the light guide post. Barbs are distributed on the side of the light outlet higher than the light guide post. Thus, by appropriately positioning the barbs, normal light output is not affected, and the range of light output angles is guaranteed.
[0010] According to another aspect of this utility model, a contact image sensor is provided, comprising a housing, an optical lens, a substrate, and the aforementioned light source assembly. The optical lens is vertically mounted on the housing, the substrate is mounted on the bottom of the housing, and an image chip receiving sensor is disposed on the substrate, located directly below the optical lens. The light source assembly is mounted on the housing. Thus, by applying the optimized housing and light guide post assembly structure to the contact image sensor, a stably positioned light source assembly can be obtained, facilitating the assembly process of the entire contact image sensor component. The light source assembly remains stable even when moved to the next workstation, eliminating the need for manual adjustment by personnel at the next workstation. Furthermore, the application of the new light source assembly results in better light uniformity and a bright spot fluctuation curve.
[0011] In some embodiments, the light source assembly is tilted relative to the optical lens, with one side of the light outlet lower than the light guide post and the other side higher than the light guide post. Barbs are distributed on the side of the light outlet higher than the light guide post, with the barbs positioned closer to the optical lens. Therefore, when installing the light source assembly, the side of the light outlet lower than the light guide post is relatively higher, and the barbs are positioned at the lower edge of the light outlet, improving the stability of the light guide post installation while ensuring the normal light emission angle range.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: During assembly, the light guide column slides into the white shell from the insertion end and is positioned by the end stop and slot, resulting in high assembly efficiency and precise positioning, ensuring the light guide column is installed correctly. In addition to the anti-detachment parts at both ends limiting the light guide column, multiple barbs along the length of the light guide column in the light outlet area of the white shell limit its movement, preventing it from arching, bending, or detaching from the white shell. After assembly, the light guide column and white shell exhibit enhanced stability in both the X and Y directions. This novel design of the light source assembly achieves stable positioning, significantly improving the yield rate and increasing the assembly speed and accuracy of subsequent contact image sensor production lines. The stable positioning design of the light source assembly ensures it remains stable even when moved to the next workstation by a human or robotic arm, eliminating the need for manual adjustment by personnel at the next workstation, saving labor costs, and improving production efficiency. The new light source assembly exhibits excellent light uniformity in contact image sensors, with no bright spots or fluctuating curves. Attached Figure Description
[0013] Figure 1 This is a test image from the existing technology showing that the brightness on the left side is reduced and the light uniformity is uneven due to the light guide column not being assembled properly.
[0014] Figure 2 This is a schematic diagram of the light guide column bending and detaching from the white shell in the existing technology. The red dotted line in the diagram indicates the direction in which the light guide column bends and detaches.
[0015] Figure 3 Because Figure 2 After the light guide column bends and detaches from the white shell, it arches in the middle, resulting in uneven light uniformity in the test diagram.
[0016] Figure 4 This is a test image showing normal light uniformity;
[0017] Figure 5 This is a schematic diagram of one embodiment of a light source assembly with an assembly and positioning structure according to the present invention;
[0018] Figure 6 This is a schematic diagram of the light guide column sliding into the white shell;
[0019] Figure 7 This is a schematic diagram of the structure of the insertion end of the white shell;
[0020] Figure 8 This is a schematic diagram of one embodiment of a contact image sensor using a novel light source component according to this utility model.
[0021] Figure 9 This is a schematic diagram of light uniformity when the light guide column is bent and detached from the white shell, showing an image of non-uniform light.
[0022] Figure 10 This is a schematic diagram of light uniformity when the light guide column is not in the correct position with the white shell, showing an image of non-uniform light.
[0023] Figure 11 This is a schematic diagram of the light uniformity of a newly designed light source component applied in a contact image sensor, which is represented by a uniform light image. Detailed Implementation
[0024] The present invention will be further described below with reference to specific embodiments.
[0025] like Figures 5 to 7 As shown, a light source assembly with an assembly and positioning structure is provided in one embodiment of this utility model. This light source assembly is used in a contact image sensor, such as... Figure 7 As shown.
[0026] like Figure 5 As shown, the light source assembly includes a white shell 1, a light guide column 2, and an LED light panel assembly 3. The white shell 1 and the light guide column 2 are strip-shaped structures that extend along the length direction. The white shell 1 is a hollow structure with light inlets 12 at both ends and a long light outlet 11 on its outer wall. The light guide column 2 is inserted into the white shell 1 through one end light inlet 12, and the LED light panel assembly 3 is installed at the end of the white shell 1.
[0027] The white shell 1 has anti-detachment parts 13 at both ends, and the light outlet 11 is located between the anti-detachment parts 13 at both ends. The white shell 1 and the anti-detachment parts 13 surround the two ends of the light guide post 2. Multiple barbs 14 are evenly distributed on the edge of the light outlet 11. When the light guide post 2 is slid into the white shell 1, the two ends of the light guide post 2 are restricted inside the white shell 1 by the anti-detachment parts 13. The barbs 14 evenly distributed on the white shell 1 can block the edge of the light guide post 2 and prevent the middle part of the light guide post 2 from bending and detaching from the white shell 1.
[0028] The light guide post 2 is assembled inside the white shell 1. One side of the light outlet 11 is lower than the light guide post 2, and the other side of the light outlet 11 is higher than the light guide post 2. The barbs 14 are distributed on the side of the light outlet 11 that is higher than the light guide post 2. The positions of the barbs 14 are reasonably set without affecting normal light output and ensuring the range of light output angle.
[0029] like Figure 6 and 7As shown, one end of the light guide post 2 has a stop portion 21. The stop portion 21 has two locations, protruding outwards from both sides of the light guide post 2. The two stop portions 21 are symmetrically arranged with respect to the axial center line of the light guide post 2. The stop portion 21 and the light guide post 2 are integrally formed. One of the light inlets 12 of the white shell 1 is an insertion end, which has a slot 15. The slot 15 has two locations, and the stop portion 21 can be inserted into the slot 15. After the light guide post 2 slides into the white shell 1, the stop portion 21 of the light guide post 2 is inserted into the slot 15 of the white shell 1. This prevents the light guide post 2 from sliding relative to the white shell 1 in the length direction and also prevents the light guide post 2 from moving relative to the white shell 1 in the width direction, ensuring that the light guide post 2 is properly installed.
[0030] like Figure 8 As shown, the light source assembly with the above-mentioned assembly and positioning structure is applied to a contact image sensor. The contact image sensor also includes a housing 4, an optical lens 5, and a substrate 6. The housing 4 has mounting positions for the optical lens 5, the substrate 6, and the light source assembly. The optical lens 5 is vertically mounted on the housing 4, and has a long strip-shaped cutout below it to facilitate light transmission. The substrate 6 has an image chip receiving sensor 7, and the substrate 6 is mounted on the bottom of the housing 4. The image chip receiving sensor 7 is located directly below the optical lens 5, and there is no obstruction between the optical lens 5 and the image chip receiving sensor 7. In this embodiment, there are two sets of light source assemblies installed inside the housing 4. The two sets of light source assemblies are respectively located on both sides of the optical lens 5, and the light source assemblies are inclined relative to the optical lens 5, with the side where the barb 14 is located closer to the optical lens 5. In this way, the side of the light outlet 11 that is lower than the light guide post 2 is relatively above, and the barb 14 is set at the lower edge of the light outlet 11 to ensure the normal light output angle range.
[0031] Applying the optimized assembly structure of the white shell 1 and light guide post 2 to a contact image sensor enables a stably positioned light source component, which facilitates the assembly process of the entire contact image sensor components. The light source component can remain stable when moved to the next workstation without manual adjustment by the personnel at the next workstation. Furthermore, the application of the new light source component results in better light uniformity and no bright spot fluctuation curves.
[0032] Two production lines were compared: one for assembling the old design and the other for assembling the new design. After assembly, the components were placed in a fixture for scanning. The scanning results of the two architectures were then examined, and the operation time was recorded as follows:
[0033] (1) Compared with the old design, the new design reduces the operator's work time from 3 minutes / piece to 1 minute / piece, saving 2 / 3 of the efficiency.
[0034] (2) The old design had problems with improper sliding and bending separation when assembling the light guide post 2 and the white shell 1. The new design achieves a stable positioning effect and greatly improves the yield of the light source components.
[0035] (3) The new design brings a new assembly method, which improves the uniformity of light and increases the yield compared to the old side-push assembly.
[0036] (4) The newly designed light source component is stable in positioning design. When the manual or robotic arm moves to the next workstation, it can remain stable without shifting. It does not require manual adjustment at the next station, saving labor costs and improving production efficiency.
[0037] (5) After the application of the newly designed light source component, the light uniformity is excellent, with no bright spot fluctuation curve. Specific comparison results are as follows: Figures 9 to 11 As shown in the figure, the test data for normal light uniformity is as follows: Figure 4 As shown.
[0038] The above descriptions are merely some embodiments of this utility model. It should be noted that those skilled in the art can make other modifications and improvements without departing from the inventive concept of this utility model, and these all fall within the protection scope of this utility model.
Claims
1. A light source assembly with an assembly and positioning structure, comprising a white shell (1), a light guide column (2), and an LED light panel assembly (3), wherein the white shell (1) and the light guide column (2) are strip-shaped structures extending along the length direction, the white shell (1) has a long light outlet (11), and the two ends of the white shell (1) have light inlets (12), the light guide column (2) is inserted into the white shell (1) through the light inlets (12), and the LED light panel assembly (3) is installed at the end of the white shell (1), characterized in that, The white shell (1) has anti-detachment parts (13) at both ends, and the light outlet (11) is located between the anti-detachment parts (13) at both ends. The white shell (1) and the anti-detachment parts (13) surround the two ends of the light guide post (2). Multiple barbs (14) are evenly distributed on the edge of the light outlet (11), and the barbs (14) block the edge of the light guide post (2).
2. The light source assembly with an assembly and positioning structure according to claim 1, characterized in that, One end of the light guide post (2) is provided with a stop part (21), the stop part (21) protrudes outward relative to the side of the light guide post (2), one of the light inlets (12) of the white shell (1) is an insertion end, the insertion end is provided with a slot (15), and the stop part (21) can be embedded in the slot (15).
3. The light source assembly with an assembly and positioning structure according to claim 2, characterized in that, The stop (21) has two locations, and the two stop (21) are arranged symmetrically with respect to the axial center line of the light guide post (2). The slot (15) is provided in two locations accordingly.
4. The light source assembly with an assembly and positioning structure according to claim 3, characterized in that, The light guide post (2) is assembled inside the white shell (1). One side of the light outlet (11) is lower than the light guide post (2), and the other side of the light outlet (11) is higher than the light guide post (2). The barbs (14) are distributed on the side of the light outlet (11) that is higher than the light guide post (2).
5. A contact image sensor, characterized in that, The device includes a housing (4), an optical lens (5), a substrate (6), and a light source assembly as described in any one of claims 1 to 4. The optical lens (5) is vertically mounted on the housing (4), the substrate (6) is mounted on the bottom of the housing (4), and an image chip receiving sensor (7) is provided on the substrate (6). The image chip receiving sensor (7) is located directly below the optical lens (5), and the light source assembly is mounted on the housing (4).
6. The contact image sensor according to claim 5, wherein the light source assembly is inclined relative to the optical lens (5), one side of the light outlet (11) is lower than the light guide post (2), the other side of the light outlet (11) is higher than the light guide post (2), the barbs (14) are distributed on the side of the light outlet (11) that is higher than the light guide post (2), and the side where the barbs (14) are located is closer to the optical lens (5).