Structure of a test fixture light guide post

Abstract

The utility model discloses a kind of structure of test fixture light guide column, related to jig field, including jig main body, the jig main body includes bottom plate and bottom plate from below to above sequentially arranged wire reel, needle disc, wire reel, needle disc between be provided with the light guide column of split type, the light guide column includes wire reel light guide column fixedly arranged in wire reel interior and needle disc light guide column fixedly arranged in needle disc interior;Wire reel light guide column and needle disc light guide column are split type structure, and wire reel light guide column and needle disc light guide column are inserted and are matched with each other and assemble.The utility model divides the light guide column of traditional integrated type into wire reel light guide column fixed in wire reel interior and needle disc light guide column fixed in needle disc interior, to effectively avoid the risk of bumping or bumping off light guide column due to improper operation, and then improve the durability of jig and stability in use process;Meanwhile, split type design also makes needle disc and wire reel independent disassembly, maintenance is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and in particular to the structure of a light guide column for a test fixture. Background Technology

[0002] In the field of circuit board testing fixtures, light guides are one of the key components for achieving precise positioning in CCD vision systems. Traditional test fixture light guides typically adopt a one-piece structure and are made of plastic.

[0003] However, existing integrated light guides have the following problems in actual use: 1. Since the light guide column protrudes from the surface of the online plate as a whole, operators are very likely to touch the light guide column during routine maintenance, adjustment or replacement of the needle plate, which may cause it to collide, loosen or even fall off and be damaged, affecting the continuity of production and the service life of the fixture. 2. The plastic material itself and the assembly gaps are prone to light scattering and leakage. In order to prevent light leakage from affecting the CCD recognition effect, the existing technology usually requires manually wrapping special light-shielding tape on the surface of the light guide column. This process not only increases the assembly steps and time, but the tape may also fall off, get dirty or leave residue after long-term use, making maintenance inconvenient and unreliable. 3. The aforementioned light leakage problem and the limited light-guiding efficiency of the plastic material will ultimately lead to insufficient uniformity and brightness of the light illuminating the product's MARK point, resulting in poor image contrast in the CCD camera, which in turn affects the positioning accuracy and the accuracy of the test.

[0004] Therefore, there is an urgent need in this field for a new light guide structure to address the shortcomings of the aforementioned one-piece plastic light guide in terms of structural stability, ease of use, and optical performance. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a structure of a light guide column for a test fixture to solve the problems existing in the background art.

[0006] This utility model provides the following technical solution: a structure of a test fixture light guide column, including a fixture body, the fixture body including a base plate and a wire coil and a needle coil arranged sequentially from bottom to top on the base plate, a split light guide column is arranged between the wire coil and the needle coil, the light guide column including a wire coil light guide column fixedly arranged inside the wire coil and a needle coil light guide column fixedly arranged inside the needle coil; The wire disc light guide and the needle disc light guide are separate structures, and they are assembled by inserting and connecting them.

[0007] Preferably, the light guide column of the coil and / or the light guide column of the needle coil are made of metal.

[0008] Preferably, the light guide column of the coil and / or the light guide column of the needle coil are made of aluminum.

[0009] Preferably, the inner wall of the wire disc light guide and / or the needle disc light guide has a smooth surface.

[0010] Preferably, a focusing ring is provided on the needle plate light guide column at a position corresponding to the needle plate surface.

[0011] Preferably, the light guide column of the coil is provided with an optical fiber interface for connecting an optical fiber of an external light source.

[0012] Preferably, there are two light guide columns, which are arranged diagonally on the wire plate and the needle plate.

[0013] Preferably, the needle disk includes a first substrate and a second substrate, wherein a first through hole is formed on the first substrate for embedding the light guide post of the needle disk, and a second through hole is formed on the second substrate for embedding the light focusing ring.

[0014] Preferably, support columns are provided at the four corners between the base plate and the wire spool to create a gap between the base plate and the wire spool, providing assembly space for the wire spool light guide column. The wire spool and the needle plate are spaced apart by the needle plate light guide column, providing assembly space for the test probe of the needle plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model divides the traditional one-piece light guide column into a wire reel light guide column fixed inside the wire reel and a needle reel light guide column fixed inside the needle reel. The two are connected and assembled by a plug-in joint, which completely isolates the operating space from the light guide column mechanically when disassembling the needle reel. This effectively avoids the risk of damaging or knocking off the light guide column due to improper operation, thereby improving the durability of the fixture and the stability during use. At the same time, the split design also makes it more convenient to disassemble and maintain the needle reel and wire reel independently. 2. The light guide column of the coil and / or the light guide column of the needle coil of this utility model is preferably made of aluminum, and its inner wall is processed into a smooth surface. Under the light-blocking characteristics of the metal material, combined with the high-gloss inner wall reflection, a high-efficiency and sealed light channel is formed, thereby eliminating the light leakage phenomenon caused by the light transmission of the plastic light guide column and the assembly gap. Compared with the traditional method of wrapping with light-blocking tape, it not only simplifies the assembly process and reduces material costs, but also avoids the maintenance and performance degradation problems caused by tape aging, falling off and residual glue. 3. This utility model sets a focusing ring at the position of the light guide column corresponding to the surface of the needle plate. Under the action of the focusing ring, the light transmitted by the light guide column is focused and regulated to form a light spot with uniform brightness and clear boundary, which accurately illuminates the MARK point of the product. Combined with the pure background light provided by the light guide column without light leakage, the image captured by the CCD camera has extremely high contrast, thereby greatly improving the accuracy and reliability of visual positioning and ensuring the precision of the test. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the fixture of this utility model.

[0017] Figure 2 This is a schematic diagram of the exploded structure of the fixture of this utility model.

[0018] Figure 3 This is a schematic diagram of the needle plate structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the light guide column structure of this utility model.

[0020] The attached diagram is labeled as follows: 1. Base plate; 2. Cable reel; 3. Pin reel; 31. First substrate; 311. First through hole; 32. Second substrate; 321. Second through hole; 4. Light guide post; 41. Cable reel light guide post; 411. Fiber optic interface; 42. Pin reel light guide post; 5. Focusing ring; 6. Support post. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0022] This utility model provides a structure for a light guide column of a testing fixture, such as... Figure 1-4 As shown, please refer to Figures 1 to 4 This utility model provides a test fixture light guide column structure, including a fixture body. The fixture body mainly includes a base plate 1 as a basic support, and a wire reel 2 and a needle reel 3 arranged sequentially from bottom to top on the base plate 1. The wire reel 2 and the needle reel 3 maintain a relative position.

[0023] Furthermore, a split light guide post 4 is provided between the wire reel 2 and the needle plate 3. Specifically, the light guide post 4 consists of a wire reel light guide post 41 fixedly disposed inside the wire reel 2 and a needle plate light guide post 42 fixedly disposed inside the needle plate 3. The wire reel light guide post 41 and the needle plate light guide post 42 are independent split structures. After the fixture is assembled, the two are assembled and connected to the optical path by plugging and connecting.

[0024] In a preferred embodiment, both the coil light guide post 41 and the pin-plate light guide post 42 are made of metal. More preferably, aluminum is preferred due to its good machinability, lightweight, and cost advantages. To ensure efficient light transmission and reduce light energy loss and scattering on the inner wall, the inner walls of both the coil light guide post 41 and the pin-plate light guide post 42 are machined to have smooth surfaces. The aluminum metal material combined with the smooth inner wall design constitutes an efficient, sealed light channel, thus eliminating the need to wrap light-shielding tape around the surface of the light guide post and solving the light leakage problem.

[0025] To achieve more precise positioning illumination, a focusing ring 5 is provided on the upper surface of the needle plate 3, corresponding to the position of the light guide post 42 on the needle plate. The function of the focusing ring 5 is to focus and regulate the light transmitted from the light guide post, forming a light spot with clear boundaries and concentrated brightness.

[0026] To introduce an external light source, an optical fiber interface 411 is provided on the side wall or bottom of the line plate light guide column 41 for connecting optical fibers from the machine's light source. External light is introduced into the line plate light guide column 41 through this interface via optical fiber, and then transmitted to the needle plate light guide column 42 through the plug-in joint, and finally emitted by the focusing ring 5.

[0027] To ensure balanced illumination and stable positioning, it is preferable to have two light guide pillars 4, and these two light guide pillars 4 are arranged diagonally on the wire plate 2 and the pin plate 3.

[0028] In this embodiment, the needle plate 3 is formed by stacking a first substrate 31 and a second substrate 32. A first through hole 311 is formed on the first substrate 31 for embedding and fixing the light guide post 42 of the needle plate. Correspondingly, a second through hole 321 is formed on the second substrate 32 for embedding and fixing the aforementioned light-concentrating ring 5. This layered structure facilitates the precise installation and fixing of each component.

[0029] To ensure the stability of the overall structure and provide space for internal components, support columns 6 are installed at the four corners between the base plate 1 and the coil 2. These support columns 6 support the base plate 1 and the coil 2, forming a gap and providing the necessary assembly space for the downward extension of the coil light guide column 41. At the same time, a gap is formed between the coil 2 and the needle plate 3 through the height of the needle plate light guide column 42 itself, which provides the necessary assembly and movement space for the test probes (not shown in the figure) on the needle plate 3.

[0030] The working principle of this utility model is as follows: When the fixture is working, the light emitted by the external machine light source is connected to the fiber optic interface 411 of the wire coil light guide column 41 through the fiber optic cable. After the light enters the metal wire coil light guide column 41, it is reflected multiple times on its smooth inner wall and is efficiently transmitted forward. Then, the light enters the needle plate light guide column 42 through the plug-in mating part and is transmitted upward in the same way. Finally, the light reaches the focusing ring 5 at the top of the needle plate light guide column 42. The focusing ring 5 focuses the light and projects it evenly onto the MARK point of the PCB board placed on the needle plate 3. The CCD camera moves above the light guide column to capture the image of the illuminated MARK point. With the provision of a high-brightness, high-contrast lighting environment without stray light interference, the CCD camera can obtain an extremely clear image, thereby achieving rapid and accurate identification and alignment of the product position, and ultimately ensuring the testing accuracy of the test fixture.

[0031] Several points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.

[0032] The above description is only a preferred embodiment of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in the present utility model should be included in the protection scope recorded in the claims.

Claims

1. A structure for a test fixture light guide column, comprising a fixture body, the fixture body including a base plate and a wire reel and a needle reel arranged sequentially from bottom to top on the base plate, characterized in that: A separate light guide column is provided between the thread spool and the needle spool. The light guide column includes a thread spool light guide column fixedly disposed inside the thread spool and a needle spool light guide column fixedly disposed inside the needle spool. The wire disc light guide and the needle disc light guide are separate structures, and they are assembled by inserting and connecting them.

2. The structure of the light guide column of the test fixture according to claim 1, characterized in that: The light guide column of the coil and / or the light guide column of the needle coil are made of metal.

3. The structure of the light guide column of the test fixture according to claim 2, characterized in that: The light guide column of the coil and / or the light guide column of the needle plate are made of aluminum.

4. The structure of the light guide column of the test fixture according to claim 3, characterized in that: The inner walls of the wire disc light guide and / or needle disc light guide are smooth surfaces.

5. The structure of a test fixture light guide column according to claim 1, characterized in that: A focusing ring is provided at a position on the surface of the needle plate corresponding to the light guide column of the needle plate.

6. The structure of a test fixture light guide column according to claim 1, characterized in that: The light guide column of the coil is equipped with an optical fiber interface for connecting an external light source's optical fiber.

7. The structure of a test fixture light guide post according to claim 1, characterized in that: The number of light guide pillars is two, and the two light guide pillars are arranged diagonally on the wire plate and the needle plate.

8. The structure of a test fixture light guide column according to claim 1, characterized in that: The needle plate includes a first substrate and a second substrate. A first through hole is formed on the first substrate for embedding the light guide post of the needle plate, and a second through hole is formed on the second substrate for embedding the light focusing ring.

9. The structure of a test fixture light guide post according to claim 1, characterized in that: Support columns are provided at the four corners between the base plate and the wire spool to create a gap between the base plate and the wire spool, providing assembly space for the wire spool light guide column. The wire spool and the needle plate are separated by the needle plate light guide column, providing assembly space for the test probes of the needle plate.

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