An infrared endoscope system

Abstract

The present invention belongs to the field of medical device technology, specifically an infrared endoscope system. The infrared endoscope system of the present invention includes an illumination light source, an objective optical system, an optical fiber image transmission system, a switching system and an image collector; the objective optical system includes five lenses and an aperture; the switching system includes six lenses and an aperture; the illumination light source is a near-infrared 1.2-1.8μm band light source; the optical fiber image transmission system uses a single-filament optical fiber, which is arranged in a hexagonal manner; the image collector uses a 320×256 pixel CCD sensor for imaging. The system designs an infrared band endoscope, which breaks the limitations of common visible light band endoscopes in certain special occasions, provides a guarantee for the stability of observation, and the system has a small size and a large field of view, which can effectively improve the efficiency of observation; the optical system adopts a spherical design, which reduces the difficulty of processing and reduces the overall cost of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of medical instruments, and in particular relates to an infrared endoscope system. Background Art

[0002] Medical endoscopes are slender medical devices, most of which are composed of a light source, a small aperture lens, a curved part, and a sensor. Endoscopes can enter the body through natural channels and tiny incisions in the human body to observe internal tissues and structures and diagnose diseases. They are widely used in modern medicine. Especially when observing the anatomical structure of some important organs, it is necessary to observe in a blood environment. Common visible light endoscopes, due to the strong absorption and scattering effect of blood on the visible light band, cause serious distortion and deformation of visible light imaging, and have problems such as poor relative illumination. However, blood's absorption and scattering of infrared light information is relatively weak. Therefore, designing an endoscope system that works in the infrared band is of great significance for the observation of surgical procedures. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, an object of the present invention is to provide an infrared endoscope system with a compact structure, small size and low cost, which is suitable for observation in special occasions.

[0004] The infrared endoscope system provided by the present invention includes an illumination light source 10, an objective optical system 20, an optical fiber image transmission system 30, a switching system 40 and an image acquisition system 50; wherein the objective optical system 20 includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25 and a first aperture 26; the switching system 40 includes a sixth lens 41, a seventh lens 42, an eighth lens 43, a ninth lens 44, a tenth lens 45, an eleventh lens 46 and a second aperture 47. The illumination light source 10 provides illumination for the observation area, and the illumination band covers 1.2-1.8 μm; one end of the fiber optic image transmission system 30 is connected to the objective optical system 20, and the other end of the fiber optic image transmission system 30 is connected to a section of the adapter system 40, and the other end of the adapter system 40 is connected to the image acquisition system 50; the arrangement order of the components in the objective optical system 20 from the object plane to the imaging plane is: the first lens 21, the first aperture 26, the second lens 22, the third lens 23, the fourth lens 24, and the fifth lens 25; the arrangement order of the lenses in the adapter system 40 from the object plane to the image plane is: the sixth lens 41, the seventh lens 42, the eighth lens 43, the ninth lens 44, the tenth lens 45, the eleventh lens 46, and the second aperture 47; The center interval between the first lens 21 and the first aperture 26 is 5.98-6.02 mm, the center interval between the first aperture 26 and the second lens 22 is 0.13-0.15 mm, the center interval between the third lens 23 and the fourth lens 24 is 1.02-1.05 mm, and the center interval between the fourth lens 24 and the fifth lens 25 is 1.50-1.62 mm; the center interval between the sixth lens 41 and the seventh lens 42 is 0.20-0.23 mm, the center interval between the eighth lens 43 and the ninth lens 44 is 0.30-0.34 mm, the center interval between the tenth lens 45 and the eleventh lens 46 is 0.20-0.24 mm, and the rear surfaces of the second aperture 47 and the eleventh lens 46 coincide.

[0005] Furthermore, the illumination light source 10 uses a near-infrared 1.2-1.8 μm band light source; the optical fiber imaging system 30 uses a single-filament optical fiber with a size of 27.5 μm and arranged in a hexagonal manner; the image collector 50 uses a 320×256 pixel CCD sensor for imaging.

[0006] Furthermore, the effective combined focal length of all lenses between the first lens 21 to the fifth lens 25 of the objective optical system 20 is 0.780-0.795 mm, the F number is 3.8-4.2, the maximum field angle is 120°, the maximum system aperture is 7.5-8.5 mm, the total system length is 14.2-14.4 mm, and the image plane size is 3.0-3.2 mm.

[0007] Furthermore, the effective combined focal length of all lenses between the sixth lens 41 to the eleventh lens 46 of the adapter system 40 is 4.3-4.5 mm, the maximum system aperture is 4.6-4.7 mm, the total system length is 18.2-18.8 mm, the object plane size is 3.0-3.2 mm, and the image plane size is 6.0-6.3 mm.

[0008] Furthermore, the pixel size of the CCD sensor is 28-32 μm, and the diagonal size is 12.5-13.8 mm.

[0009] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0010] (1) The present invention designs an infrared endoscope system that uses infrared bands for imaging and information collection, breaking the limitations of common visible light band endoscopes in certain special occasions and providing a guarantee for the stability of observation;

[0011] (2) The present invention optimizes the optical system structure to achieve a maximum field of view of 120°. During the observation process, there is no need to repeatedly switch the azimuth adjustment lens, which can effectively improve the observation efficiency. In addition, the system size is small, with a maximum system outer diameter of only 8 mm.

[0012] (3) All optical structures in the infrared endoscope system proposed in the present invention adopt a spherical design, which reduces the processing difficulty, improves the production efficiency, and reduces the overall cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the infrared endoscope system of the present invention.

[0014] Figure 2 Schematic diagram of an objective optical system in an embodiment of the present invention.

[0015] Figure 3 Schematic diagram of a switching system in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto. Example

[0017] like Figure 1As shown, an infrared endoscope system includes: an illumination system 10, an objective optical system 20, an optical fiber image transmission system 30, a switching system 40 and an image acquisition system 50; the objective optical system 20 includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25 and a first aperture 26; the switching system 40 includes a sixth lens 41, a seventh lens 42, an eighth lens 43, a ninth lens 44, a tenth lens 45, an eleventh lens 46 and a second aperture 47.

[0018] Furthermore, the light source of the illumination system 10 is in the near-infrared 1.2-1.8 μm band; the size of the single-filament optical fiber of the optical fiber image transmission system 30 is 27.5 μm and is arranged in a hexagonal manner; the image acquisition system 50 uses a 320×256 pixel CCD sensor for imaging. Furthermore, the pixel size of the CCD sensor is 30 μm and the diagonal size is 12.3 mm. Furthermore, the maximum field of view of the infrared endoscope system can reach 120°.

[0019] Furthermore, if Figure 2 As shown, the objective optical system 20 has an effective focal length of 0.797 mm, an F number of 4, a maximum field angle of 120°, a maximum system aperture of 8 mm, a total system length of 14.32 mm, and an image plane size of 3 mm.

[0020] Furthermore, the focal length of the first lens 21 is -0.25332 mm. -1 , the focal length of the second lens 22 is 0.027513 mm -1 , the focal length of the third lens 23 is 0.22451 mm -1 , the focal length of the fourth lens 24 is -0.06921 mm -1 , the optical power of the fifth lens 25 is 0.21563 mm -1 .

[0021] Furthermore, the center thickness of the first lens 21 is 0.9502 mm, the center thickness of the second lens 22 is 1.1573 mm, the center thickness of the third lens 23 is 0.6328 mm, the center thickness of the fourth lens 24 is 2.1183 mm, and the center thickness of the fifth lens 25 is 0.8950 mm.

[0022] Furthermore, the net aperture of the first lens 21 is 4.0000 mm, the net aperture of the second lens 2 is 0.6650 mm, the net aperture of the third lens 23 is 0.9961, the net aperture of the fourth lens 24 is 1.4874 mm, and the net aperture of the fifth lens 25 is 1.6830 mm.

[0023] Furthermore, if Figure 3As shown, the effective focal length of the adapter system 40 is 4.37 mm, the maximum system aperture is 4.6074 mm, the total system length is 18.65 mm, the object plane size is 3 mm, and the image plane size is 6.15 mm.

[0024] Further, the focal length of the sixth lens 41 is -14.388 mm, the focal length of the seventh lens 42 is -4.1374 mm, the focal length of the eighth lens 43 is 2.8073 mm, the focal length of the ninth lens 44 is -3.9673 mm, the focal length of the tenth lens 45 is 2.6718 mm, and the focal length of the eleventh lens 46 is -19.507 mm.

[0025] Furthermore, the center thickness of the sixth lens 41 is 0.9722 mm, the center thickness of the seventh lens 42 is 0.5234 mm, the center thickness of the eighth lens 43 is 1.8306 mm, the center thickness of the ninth lens 44 is 0.5667 mm, the center thickness of the tenth lens 45 is 1.4138 mm, and the center thickness of the sixth lens 46 is 1.0976 mm.

[0026] Further, the center interval between the first lens 21 and the first aperture 26 is 5.9842 mm, the center interval between the first aperture 26 and the second lens 22 is 0.1324 mm, the center interval between the third lens 23 and the fourth lens 24 is 1.0359 mm, and the center interval between the fourth lens 24 and the fifth lens 25 is 1.5968 mm; the center interval between the sixth lens 41 and the seventh lens 42 is 0.2153 mm, the center interval between the eighth lens 43 and the ninth lens 44 is 0.327 mm, the center interval between the tenth lens 45 and the eleventh lens 46 is 0.2145 mm, and the rear surfaces of the second aperture 47 and the eleventh lens 46 coincide with each other.

[0027] Further, the net diameter of the sixth lens 41 is 2.0719 mm, the net diameter of the seventh lens 42 is 2.3037 mm, the net diameter of the eighth lens 43 is 2.2823, the net diameter of the ninth lens 44 is 2.1253 mm, the net diameter of the tenth lens 45 is 1.9252 mm, and the net diameter of the eleventh lens 46 is 1.5989 mm. Further, the rear surfaces of the second aperture 47 and the eleventh lens 46 overlap.

[0028] The above embodiment is only one implementation of the present invention, but the implementation of the present invention is not limited to the above embodiment. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. An infrared endoscope system, characterized in that: The invention comprises an illumination light source (10), an objective optical system (20), an optical fiber image transmission system (30), a switching system (40) and an image acquisition system (50); wherein the illumination light source (10) provides illumination for an observation area, and the illumination wavelength band covers 1.2-1.8 μm; one end of the optical fiber image transmission system (30) is connected to the objective optical system (20), the other end of the optical fiber image transmission system (30) is connected to a section of the switching system (40), and the other end of the switching system (40) is connected to the image acquisition system (50); the objective optical system comprises, arranged in sequence from the object plane to the imaging plane: a first lens (21), a first aperture (26), a second lens (22), a third lens (23), a fourth lens (24), and a fifth lens (25); the switching system (40) comprises, arranged in sequence from the object plane to the imaging plane: a sixth lens (41), a seventh lens (42), an eighth lens (43), a ninth lens (44), a tenth lens (45), and a second lens (25). The invention relates to a lens (45), an eleventh lens (46), and a second aperture (47); the center spacing between the first lens (21) and the first aperture (26) is 5.98-6.02 mm, the center spacing between the first aperture (26) and the second lens (22) is 0.13-0.15 mm, the center spacing between the third lens (23) and the fourth lens (24) is 1.02-1.05 mm, and the center spacing between the fourth lens (24) and the fifth lens (25) is 1.50-1.62 mm; the center spacing between the sixth lens (41) and the seventh lens (42) is 0.20-0.23 mm, the center spacing between the eighth lens (43) and the ninth lens (44) is 0.30-0.34 mm, the center spacing between the tenth lens (45) and the eleventh lens (46) is 0.20-0.24 mm, and the rear surfaces of the second aperture (47) and the eleventh lens (46) overlap.

2. The infrared endoscope system according to claim 1, characterized in that: The illumination light source (10) uses a near-infrared 1.2-1.8 μm band light source; the optical fiber image transmission system (30) uses a single-filament optical fiber with a size of 27.5 μm and arranged in a hexagonal manner; and the image acquisition system (50) uses a 320×256 pixel CCD sensor for imaging.

3. The infrared endoscope system according to claim 2, characterized in that: The effective combined focal length of all lenses between the first lens (21) to the fifth lens (25) of the objective optical system (20) is 0.780-0.795 mm, the F number is 3.8-4.2, the maximum field angle is 120°, the maximum system aperture is 7.5-8.5 mm, the total system length is 14.2-14.4 mm, and the image plane size is 3.0-3.2 mm.

4. The infrared endoscope system according to claim 3, characterized in that: The effective combined focal length of all lenses between the sixth lens (41) to the eleventh lens (46) of the adapter system (40) is 4.3-4.5 mm, the maximum system aperture is 4.6-4.7 mm, the total system length is 18.2-18.8 mm, the object plane size is 3.0-3.2 mm, and the image plane size is 6.0-6.3 mm.

5. The infrared endoscope system according to claim 4, characterized in that: The pixel size of the CCD sensor is 28-32 μm, and the diagonal size is 12.5-13.8 mm.

Images