PDA anti-glare device

Abstract

This utility model discloses a PDA anti-stray light device, comprising a front anti-stray light baffle, a bandpass filter, an optical slit baffle, and a rear anti-stray light baffle, which are bonded together sequentially from top to bottom. The front anti-stray light baffle has multiple light-transmitting holes, the bandpass filter filters out stray light, the optical slit baffle has multiple first slits corresponding to the position of the target spectrum, and the rear anti-stray light baffle has multiple second slits corresponding to the first slits. The front anti-stray light baffle, bandpass filter, optical slit baffle, and rear anti-stray light baffle are pressed together by a pressing fixture. The rear anti-stray light baffle is sealed within a groove in the PDA board, while the front anti-stray light baffle, bandpass filter, and optical slit baffle are positioned above the PDA board, with the optical slit baffle sealed to the PDA board. This utility model features an ingenious structure and precise packaging, effectively avoiding stray light interference during PDA measurements and significantly improving measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of biochemical analysis and photometric technology, and in particular to a PDA anti-stray light device. Background Technology

[0002] The photometric receiver of a fully automated biochemical analyzer uses a PDA (photo-diode array) for measurement. A PDA is a photodiode array detector, consisting of a series of photodiodes closely arranged on crystalline silicon. Typically, one diode corresponds to a single nanometer of monochromatic light in the received spectrum. Currently, using a PDA to directly receive the continuous spectrum after grating dispersion is susceptible to interference from stray light due to factors such as grating manufacturing precision and reflected light during transmission from the light source to the grating. This reduces measurement accuracy. Summary of the Invention

[0003] To address the aforementioned problems, this utility model provides a PDA anti-stray light device with high manufacturing precision and high measurement accuracy, specifically employing the following technical solution:

[0004] The PDA anti-stray light device of this utility model is suitable for a PDA board with a groove on its top surface. The anti-stray light device includes a front anti-stray light baffle, a bandpass filter, an optical slit baffle, and a rear anti-stray light baffle bonded together sequentially from top to bottom. The front anti-stray light baffle has multiple light-transmitting holes, which are arranged to correspond to multiple wavelength bands of the continuous spectrum separated by the grating. The bandpass filter is used to filter out stray light. The optical slit baffle has multiple first slits corresponding to the position of the target spectrum. The rear anti-stray light baffle has multiple second slits corresponding to the first slits. The front anti-stray light baffle, bandpass filter, optical slit baffle, and rear anti-stray light baffle are pressed together by a pressing tool. The rear anti-stray light baffle is sealed in the groove of the PDA board. The front anti-stray light baffle, bandpass filter, and optical slit baffle are arranged above the PDA board, and the optical slit baffle is sealed to the PDA board.

[0005] The front anti-stray light baffle, bandpass filter, and optical slit baffle are all the same size and larger than the rear anti-stray light baffle. The outer dimensions of the rear anti-stray light baffle are adapted to the groove of the PDA board.

[0006] The front anti-stray light shield, the optical slit shield, and the rear anti-stray light shield are all black light-absorbing plates, and the size of the second slit is larger than that of the corresponding first slit.

[0007] The front anti-stray light shield, bandpass filter, optical slit shield, and rear anti-stray light shield are bonded together with a transparent UV-curable adhesive.

[0008] The pressing fixture includes a positioning base plate, a liner plate, and a pressure plate. The positioning base plate has a first slot adapted to the rear anti-stray light baffle. The bottom of the first slot has multiple first light-transmitting holes. The positioning base plate also has multiple spaced limiting blocks. The limiting blocks form a second slot for positioning the front anti-stray light baffle, the bandpass filter, and the optical slit baffle. The gap between adjacent limiting blocks forms a second light-transmitting hole. The liner plate is positioned above the front anti-stray light baffle, and the pressure plate is positioned above the liner plate.

[0009] The liner is the same size as the front anti-stray light baffle and is set in the second slot; the pressure plate is connected to the top surface of the limiting block and is provided with a top bead that is connected to the liner.

[0010] The positioning base plate is hinged to the pressure plate, and a locking mechanism is provided on the positioning base plate.

[0011] This utility model provides a PDA anti-stray light device that initially filters out the target spectrum using a front anti-stray light baffle, further filters it using a bandpass filter, and creates slits in the optical slit baffle and rear anti-stray light baffle corresponding to each target spectrum to form a light path to the PDA board. Since the rear anti-stray light baffle is filled into a groove in the PDA board, and the optical slit baffle above it is sealed to the outer contour of the PDA board, a dark chamber is formed that is tightly fitted to the diode being measured on the PDA, effectively preventing reflected light during light propagation. Furthermore, the front anti-stray light baffle, bandpass filter, optical slit baffle, and rear anti-stray light baffle are pre-pressed together using a pressing fixture, ensuring overall flatness and effectively improving the alignment accuracy of each set of slits, avoiding the impact of insufficient manufacturing precision on measurement accuracy. This utility model has an ingenious structure and precise packaging, effectively avoiding stray light interference during PDA measurement and significantly improving measurement accuracy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the pressing tool described in this utility model.

[0014] Figure 3 yes Figure 2 A schematic diagram of the structure of the center positioning base plate. Detailed Implementation

[0015] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific implementation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0016] like Figure 1-3As shown, the PDA anti-stray light device of this utility model is suitable for a PDA board with a groove a on the top surface. Specifically, the anti-stray light device includes a front anti-stray light baffle 1, a bandpass filter 2, an optical slit baffle 3, and a rear anti-stray light baffle 4 arranged sequentially from top to bottom, with adjacent components bonded together by a transparent UV-curable adhesive.

[0017] The front anti-stray light baffle 1 is a black light-absorbing thin plate, the length and width of which are greater than or equal to the length and width of the continuous spectrum m divided by the grating. Multiple light-transmitting holes 11 are correspondingly formed on it according to the multiple wavelength bands of the continuous spectrum m. The light-transmitting holes 11 are used to initially screen out the target spectrum and block other stray light. The bandpass filter 2 is a commercially available optical component used to filter out stray light (it only allows the target spectrum and longer wavelengths to pass through), thus making the spectrum passing through the bandpass filter 2 closer to the target spectrum. The optical slit baffle 3 is also a black light-absorbing thin plate, with a first slit 31 corresponding to the position of the target spectrum, used to further restrict the target spectrum, remove stray light, and output the ideal target spectrum. The rear anti-stray light baffle 4 is a black light-absorbing plate, the thickness of which matches the depth of the groove a of the PDA board, and a second slit 41 is formed on it. The second slit 4 corresponds one-to-one with the first slit 31, and the size of the corresponding second slit 4 is slightly larger than that of the first slit 31.

[0018] The cross-sectional sizes of the aforementioned front anti-stray light baffle 1, bandpass filter 2, and optical slit baffle 3 are all equal and larger than the cross-sectional size of the rear anti-stray light baffle 4. The external dimensions of the rear anti-stray light baffle 4 are adapted to the groove a of the PDA board. The front anti-stray light baffle 1, bandpass filter 2, optical slit baffle 3, and rear anti-stray light baffle 4 are pressed and bonded together using a pressing tool. Then, the rear anti-stray light baffle 4 is tightly fitted into the groove a of the PDA board. Since its top surface is flush with the top surface of the PDA board, the edge of the optical slit baffle 3 can be attached to the upper surface of the PDA board. After the two are sealed together with adhesive, a dark chamber is formed that is tightly attached to the diode being tested on the PDA, thereby effectively avoiding reflected light during light propagation and improving measurement accuracy.

[0019] The front anti-stray light baffle 1, bandpass filter 2, optical slit baffle 3, and rear anti-stray light baffle 4 are pressed and bonded together in one go using a pressing fixture, which can effectively improve the docking accuracy of each set of slits and ensure the overall flatness of the pressed workpiece.

[0020] The aforementioned pressing fixture includes a positioning base plate 51, a liner plate 52, and a pressure plate 53. The positioning base plate 51 and the pressure plate 53 are hinged together at one end and locked at the other end by a locking mechanism.

[0021] In this embodiment, the locking mechanism employs a vertical positioning shaft 61 mounted on a positioning base plate 51, and a rotating pressure block 62 mounted on the vertical positioning shaft 61. After the front anti-stray light baffle 1, bandpass filter 2, optical slit baffle 3, and rear anti-stray light baffle 4 are placed in position, a liner 52 is placed on the front anti-stray light baffle 1. Then, a pressure plate 53 is placed over the liner 52, and the rotating pressure block 62 is rotated over the pressure plate 53 to achieve locking. When it is necessary to remove the pressed part, the rotating pressure block 62 is rotated out of the pressure plate 53, the pressure plate 53 is opened, and the liner 52 and the part are removed in sequence.

[0022] The positioning base plate 51 is provided with a first slot 71 adapted to the rear anti-stray light baffle 4. Multiple first light-transmitting holes 72 are provided at the bottom of the first slot 71. The positioning base plate 51 is also provided with multiple spaced-apart limiting blocks 73. These limiting blocks 73 constitute a second slot 74 for positioning the front anti-stray light baffle 1, the bandpass filter 2, and the optical slit baffle 3. The gap between adjacent limiting blocks 73 constitutes a second light-transmitting hole 75. In this embodiment, the limiting blocks 73 are distributed along the outer edges of adjacent sides of the first slot 71. Therefore, in use, the rear anti-stray light baffle 4 is first installed in the first slot 71. Then, the front anti-stray light baffle 1, the bandpass filter 2, and the optical slit baffle 3 are stacked sequentially, with their two sides close to the limiting blocks 73, thus achieving the installation of the front anti-stray light baffle 1, the bandpass filter 2, and the optical slit baffle 3 in the second slot 74. The aforementioned limiting blocks 73 have a uniform height, and their height is greater than or equal to the sum of the thicknesses of the front anti-stray light baffle 1, the bandpass filter 2, the optical slit baffle 3, and the liner 52. This ensures that after the front anti-stray light baffle 1, the bandpass filter 2, and the optical slit baffle 3 are installed in place, the liner 52 can also be easily positioned and installed in the second slot 74. To achieve the purpose of pressing down on the aforementioned components, multiple elastic rubber top beads 76 are installed on the pressure plate 53. After the rear anti-stray light baffle 4, the front anti-stray light baffle 1, the bandpass filter 2, the optical slit baffle 3, and the liner 52 are installed in place, the pressure plate 53 is placed over the liner 52. At this time, the pressure plate 53 is in contact with the top surface of the limiting block 73, and the top beads 76 are in close contact with the liner 52.

[0023] Due to the positioning function of the first slot 71 and the second slot 74, the front anti-stray light baffle 1, the bandpass filter 2, the optical slit baffle 3, and the rear anti-stray light baffle 4 can be quickly and accurately positioned, thus ensuring precise alignment of the groups of light-transmitting holes / slits on each component. Before installation, a transparent UV-curable adhesive is applied to the mating surfaces of each component. During the pressing process, ultraviolet light is irradiated onto the pressed parts through the first light-transmitting hole 72 and the second light-transmitting hole 75, thereby achieving the purpose of adhesion.

[0024] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A PDA anti-stray light device, suitable for a PDA board with a groove on its top surface, characterized in that: The anti-stray light device includes a front anti-stray light baffle, a bandpass filter, an optical slit baffle, and a rear anti-stray light baffle, which are bonded together sequentially from top to bottom. The front anti-stray light baffle has multiple light-transmitting holes, which are arranged to correspond to multiple wavelength bands of the continuous spectrum separated by the grating. The bandpass filter is used to filter out stray light. The optical slit baffle has multiple first slits corresponding to the position of the target spectrum. The rear anti-stray light baffle has multiple second slits corresponding to the first slits. The front anti-stray light baffle, the bandpass filter, the optical slit baffle, and the rear anti-stray light baffle are pressed together by a pressing fixture. The rear anti-stray light baffle is sealed in the groove of the PDA board. The front anti-stray light baffle, the bandpass filter, and the optical slit baffle are arranged above the PDA board, and the optical slit baffle is sealed to the PDA board.

2. The PDA anti-stray light device according to claim 1, characterized in that: The front anti-stray light baffle, bandpass filter, and optical slit baffle are all the same size and larger than the rear anti-stray light baffle. The outer dimensions of the rear anti-stray light baffle are adapted to the groove of the PDA board.

3. The PDA anti-stray light device according to claim 1, characterized in that: The front anti-stray light shield, the optical slit shield, and the rear anti-stray light shield are all black light-absorbing plates, and the size of the second slit is larger than that of the corresponding first slit.

4. The PDA anti-stray light device according to claim 1, characterized in that: The front anti-stray light shield, bandpass filter, optical slit shield, and rear anti-stray light shield are bonded together with a transparent UV-curable adhesive.

5. The PDA anti-stray light device according to claim 1, characterized in that: The pressing fixture includes a positioning base plate, a liner plate, and a pressure plate. The positioning base plate has a first slot adapted to the rear anti-stray light baffle. The bottom of the first slot has multiple first light-transmitting holes. The positioning base plate also has multiple spaced limiting blocks. The limiting blocks form a second slot for positioning the front anti-stray light baffle, the bandpass filter, and the optical slit baffle. The gap between adjacent limiting blocks forms a second light-transmitting hole. The liner plate is positioned above the front anti-stray light baffle, and the pressure plate is positioned above the liner plate.

6. The PDA anti-stray light device according to claim 5, characterized in that: The liner is the same size as the front anti-stray light baffle and is set in the second slot; the pressure plate is connected to the top surface of the limiting block and is provided with a top bead that is connected to the liner.

7. The PDA anti-stray light device according to claim 6, characterized in that: The positioning base plate is hinged to the pressure plate, and a locking mechanism is provided on the positioning base plate.

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