Stray light suppression device in optical-mechanical system of biochemical analyzer

Abstract

The invention belongs to the technical field of stray light suppression devices for optical machines of biochemical analyzers, and particularly relates to a stray light suppression device in an optical machine system of a biochemical analyzer. A double-conical-surface aperture diaphragm sleeve is arranged in the optical fiber channel, a double-conical-surface aperture diaphragm device is arranged in the double-conical-surface aperture diaphragm sleeve, and the other end of the double-conical-surface aperture diaphragm device abuts against the aperture diaphragm. The double-conical-surface aperture diaphragm device comprises a plurality of double-conical-surface aperture diaphragms which are connected in sequence, when the cavity diameter phi of the optical fiber channel is larger than or equal to 8 mm, the thickness of each double-conical-surface aperture diaphragm is larger than or equal to 4 mm, and the number of the double-conical-surface aperture diaphragms is larger than or equal to 4; when the number of the double-conical-surface aperture diaphragms is larger than or equal to 4, the two cone angles of the double-conical-surface aperture diaphragms are 45.0 + / -5.0 degrees and 25.0 + / -5.0 degrees respectively in the light advancing direction.

Description

Technical Field

[0001] The invention belongs to the technical field of biochemical instrument optical-mechanical stray light suppression devices, and in particular relates to a stray light suppression device in an optical-mechanical system of a biochemical instrument. Background Art

[0002] The optical detection system in the biochemical analyzer is one of its core components, responsible for optical analysis of samples to determine various biochemical indicators. During the use of the optical detection system of the biochemical analyzer, the numerical aperture of the quartz optical fiber used is 0.22±0.01mm, and its corresponding divergence angle in the air medium is about 25.4±1.2°.

[0003] Due to the limitation of the spot size requirement on the internal optical path of the reaction cup, an aperture stop is added in front of the combined lens to control the large-angle light emitted from the optical fiber; through simulation analysis, it is determined that the light with a divergence angle greater than 7.94° will irradiate the inner surface of the optical fiber holder; the above large-angle light is reflected by the inner surface of the optical fiber holder, converged by the combined lens, and then reflected by the plane reflector to the front surface of the reaction cup, forming a bright ring. The light that does not meet the above requirements will be reflected after irradiating the inner surface of the optical fiber holder, forming stray light that reaches the front surface of the reaction cup, and finally causing abnormal test data. In order to suppress stray light, stray light suppression components are usually integrated in biochemical analyzers.

[0004] The technical defects of existing stray light suppression devices involve material selection, design rationality, coating applicability, optical system parameters, complexity of optical path design, and environmental friendliness, which are mainly manifested in the following aspects: (1) Design of light-blocking rings and shading blades: Adding light-blocking rings, shading blades, etc. to the light path can reduce or weaken the stray light path, but may lead to unsatisfactory stray light suppression effect; (2) Applicability of surface coatings: In order to better suppress stray light, the surface of mechanical parts is treated, such as changing the surface roughness and porosity of the coating to scatter and absorb stray light. Generally, stray light-eliminating coatings should be used in combination with light-blocking rings, but inappropriate coatings may not achieve the expected stray light suppression effect; (3) Influence of optical system parameters: The generation of stray light may be caused by various factors, such as dust contaminating optical components, damage or defects of optical components, reflection inside the collimation system or the edge of related partitions, etc.

[0005] In order to overcome the above-mentioned defects, the present invention hopes to provide a stray light suppression device in the optical-mechanical system of a biochemical analyzer. Summary of the invention

[0006] The object of the present invention is to provide a stray light suppression device in an optical-mechanical system of a biochemical analyzer to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: A stray light suppression device in an optical-mechanical system of a biochemical instrument comprises a combined lens bracket and an optical fiber bracket, wherein a lens channel is provided at the central position of the combined lens bracket, and an optical fiber channel is provided at the central position of the optical fiber bracket, the combined lens bracket and the optical fiber bracket are fitted together, and the opening end of the lens channel is engaged with the opening end of the optical fiber channel; a combined lens and an aperture stop are provided inside the lens channel; a double-conical hole aperture stop sleeve is provided inside the optical fiber channel, a double-conical hole aperture stop device is provided inside the double-conical hole aperture stop sleeve, and the double-conical hole aperture stop device is provided inside the double-conical hole aperture stop sleeve. The other end of the double cone hole diameter stop device abuts against the aperture stop; the double cone hole diameter stop device includes a plurality of double cone hole diameter stops connected in sequence, when the cavity diameter Φ of the optical fiber channel is ≥8 mm and the cross-sectional size of the optical fiber channel is 1×1.1 mm, the thickness of the double cone hole diameter stop is ≥4 mm, and the number of the double cone hole diameter stops is ≥4; when the number of the double cone hole diameter stops is ≥4, along the direction of light travel, the two cone angles of the double cone hole diameter stop are 45.0±5.0° and 25.0±5.0° respectively.

[0008] Preferably, a plane mirror reflection seat is provided at the end of the combined lens bracket, and a plane reflector is provided at the plane mirror reflection seat; the plane reflector forms an angle of 45° with the vertical direction, and correspondingly, an exit aperture is provided below the plane mirror reflection seat.

[0009] Preferably, a spring is provided between the double-conical surface aperture stop sleeve and the aperture stop.

[0010] Preferably, the biconical surface diameter stop, aperture stop, combined lens and plane reflector are coaxial.

[0011] Preferably, the clear aperture of the double cone aperture stop increases in sequence according to the arrangement order.

[0012] Preferably, along the advancing direction of the light, the rear aperture size of the first biconical hole diameter stop is the same as the front aperture size of the second biconical hole diameter stop, and the two are connected with the same size.

[0013] Preferably, a combined lens seat is provided at the end of the lens channel.

[0014] Preferably, the surfaces of the optical fiber bracket, the biconical hole diameter stop, the aperture stop and the exit stop are subjected to optical blackening treatment or matte blackening treatment and sandblasting treatment of 80-200 mesh.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention provides a stray light suppression device in a biochemical instrument optical and mechanical system, which uses a plurality of double-conical aperture diaphragms stacked together to greatly reduce the volume of the stray light suppression component; (2) The present invention provides a stray light suppression device in the optical-mechanical system of a biochemical analyzer, which uses a plurality of double-conical hole diameter diaphragms in stacking. After the light with a divergence angle greater than 7.94° is incident on the cone surface of the double-conical hole diameter diaphragm, it undergoes multiple reflections (or scattering), and the energy is greatly attenuated, thereby achieving the purpose of suppressing stray light, and can achieve the purpose of suppressing light incident at a large angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the double cone aperture stop of the present invention when stacked; Figure 3 It is a schematic structural diagram of a single double cone aperture stop of the present invention; Explanation of reference numerals: 1. Biconical hole diameter diaphragm; 2. Combined lens bracket; 3. Optical fiber bracket; 4. Lens channel; 5. Optical fiber channel; 6. Aperture diaphragm; 7. Combined lens; 8. Combined lens holder; 9. Biconical hole diameter diaphragm sleeve; 10. Biconical hole diameter diaphragm device; 11. Spring; 12. Plane mirror reflection seat; 13. Plane reflecting mirror; 14. Exit diaphragm. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1

[0019] A stray light suppression device in a biochemical instrument optical system comprises a combined lens holder 2 and an optical fiber holder 3. A lens channel 4 is provided at the central position of the combined lens holder 2, and an optical fiber channel 5 is provided at the central position of the optical fiber holder 3. The combined lens holder 2 and the optical fiber holder 3 are fitted together, and the opening end of the lens channel 4 is engaged with the opening end of the optical fiber channel 5. An aperture stop 6 and a combined lens 7 and a combined lens holder 8 are provided inside the lens channel 4. A double-conical hole aperture stop sleeve 9 is provided inside the optical fiber channel 5, and a double-conical hole aperture stop device 10 is provided inside the double-conical hole aperture stop sleeve 9, and the other end of the double-conical hole aperture stop device 10 abuts against the aperture stop 6. A spring 11 is provided between the double-conical hole aperture stop sleeve 9 and the aperture stop 6, and the provision of the spring 11 can make the double-conical hole aperture stop sleeve 9 and the aperture stop 6 more stable. The specific cross-sectional structure of the device is shown in FIG. Figure 1 .

[0020] A plane mirror reflector 12 is provided at the end of the combined lens bracket 2, and a plane reflector 13 is provided at the plane mirror reflector 12. The biconical aperture stop 1, the aperture stop 6, the combined lens 7, and the plane reflector 13 are coaxial. The plane reflector 13 is at an angle of 45° to the vertical direction, and correspondingly, an exit stop 14 is provided below the plane mirror reflector 12. Finally, the exit light spot is presented directly below the exit stop 14.

[0021] The double cone hole diameter stop device 10 includes four double cone hole diameter stops 1 connected in sequence. When the cavity diameter Φ of the optical fiber channel 5 is 8 mm, the thickness of the double cone hole diameter stop 1 is 4 mm. When the number of double cone hole diameter stops 1 is 4, along the direction of light advance, the two cone angles of the double cone hole diameter stop 1 are 45.0° and 25.0° respectively. For the description of the two cone angles, see Figure 3 . The aperture of the biconical hole diameter stop 1 increases in sequence according to the arrangement order. Along the direction of light advance, the rear aperture size of the first biconical hole diameter stop 1 is the same as the front aperture size of the second biconical hole diameter stop 1, and the two are connected with the same size. In order to further enhance the stray light suppression effect, the surfaces of the optical fiber bracket 3, the biconical hole diameter stop 1, the aperture stop 6 and the exit stop 14 are matte blackened and sandblasted with 80-200 mesh. The specific cross-sectional structure of the biconical hole diameter stop device 10 is shown in Figure 2 .

[0022] In this embodiment, the diameter of the optical fiber channel 5 is 1×1.1 mm, the light emission angle is 25.4°, and the required field angle is 7.94°. The size of the final emission spot is 0.9×0.98 mm, and the emission spot shows no obvious bright ring or stray light outside the main spot.

[0023] Example 2-Example 6 The incident angle of the light is 25.4°. The parameters in Table 1 are different, and the other conditions are the same as those in Example 1.

[0024] Table 1 is a record of different parameters and experimental results of Examples 2 to 6 Number parameter Fiber channel diameter (mm) Double cone aperture diameter thickness (mm) Number of double cone aperture diaphragms (pcs) Double cone aperture aperture cone angle (° / °) Outgoing spot size (mm) Outgoing light spot characteristics Example 2 1×1.1 2 4 43° / 23° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 3 1×1.1 2 4 41° / 21° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 4 1×1.1 2 4 40° / 20° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 5 1×1.1 2 4 39° / 19° 0.9×0.98 Slightly visible bright ring Example 6 1×1.1 2 4 37° / 17° 0.9×0.98 Clearly visible bright ring

[0025] Example 7-Example 11 The incident angle of the light is 25.4°. The parameters in Table 2 are different, and the other conditions are the same as those in Example 1.

[0026] Table 2 is a record of different parameters and experimental results of Examples 7 to 11 Number parameter Fiber channel diameter (mm) Double cone aperture diameter thickness (mm) Number of double cone aperture diaphragms (pcs) Double cone aperture aperture cone angle (° / °) Outgoing spot size (mm) Outgoing light spot characteristics Example 7 1×1.1 2 4 47° / 27° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 8 1×1.1 2 4 49° / 29° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 9 1×1.1 2 4 50° / 30° 0.9×0.98 There is no obvious bright ring or stray light outside the main light spot Example 10 1×1.1 2 4 51° / 31° 0.9×0.98 Slightly visible stray light Embodiment 11 1×1.1 2 4 53° / 33° 0.9×0.98 Clearly visible bright ring

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stray light suppression device in a biochemical instrument optical and mechanical system, characterized in that: The invention comprises a combined lens support and an optical fiber support, wherein a lens channel is provided at the central position of the combined lens support, and an optical fiber channel is provided at the central position of the optical fiber support, wherein the combined lens support and the optical fiber support are fitted together, and the opening end of the lens channel is engaged with the opening end of the optical fiber channel; a combined lens and an aperture stop are provided inside the lens channel; a double-conical surface aperture stop sleeve is provided inside the optical fiber channel, and a double-conical surface aperture stop device is provided inside the double-conical surface aperture stop sleeve, and the other end of the double-conical surface aperture stop device abuts against the aperture stop; the double-conical surface aperture stop device comprises a plurality of double-conical surface aperture stops connected in sequence, and when the cavity diameter Φ of the optical fiber channel is ≥8 mm and the cross-sectional size of the optical fiber channel is 1×1.1 mm, the thickness of a single double-conical surface aperture stop is ≥4 mm, and the number of the double-conical surface aperture stops is ≥4; when the number of the double-conical surface aperture stops is ≥4, along the advancing direction of the light, the two cone angles of the double-conical surface aperture stop are 45.0±5.0° and 25.0±5.0° respectively.

2. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: A plane mirror reflection seat is provided at the end of the combined lens bracket, and a plane reflector is provided at the plane mirror reflection seat; the plane reflector forms an angle of 45° with the vertical direction, and correspondingly, an exit aperture is provided below the plane mirror reflection seat.

3. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: A spring is arranged between the double cone-shaped aperture stop sleeve and the aperture stop.

4. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 2, characterized in that: The biconical surface diameter stop, the aperture stop, the combined lens and the plane reflector are coaxial.

5. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: The light aperture of the double cone hole aperture stop increases in sequence according to the arrangement order.

6. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: Along the direction of light travel, the rear aperture size of the first biconical hole diameter diaphragm is the same as the front aperture size of the second biconical hole diameter diaphragm, and the two are connected with the same size.

7. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: A combined lens seat is provided at the end of the lens channel.

8. The stray light suppression device in the optical-mechanical system of a biochemical analyzer according to claim 1, characterized in that: The surfaces of the optical fiber bracket, the biconical diameter stop, the aperture stop and the exit stop are subjected to optical blackening treatment or matte blackening treatment and sandblasting treatment of 80-200 mesh.

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