CN101140355A - High-resolution low distortion refraction diffraction farrago electric inter lens image-forming system - Google Patents
High-resolution low distortion refraction diffraction farrago electric inter lens image-forming system Download PDFInfo
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- CN101140355A CN101140355A CNA2006100155987A CN200610015598A CN101140355A CN 101140355 A CN101140355 A CN 101140355A CN A2006100155987 A CNA2006100155987 A CN A2006100155987A CN 200610015598 A CN200610015598 A CN 200610015598A CN 101140355 A CN101140355 A CN 101140355A
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Abstract
The present invention relates to an electronic endoscope object lens system, in particular to an electronic endoscope system suitable for rigid endoscope tubes with metal halogen lamp as a cold light source, a flexible front end and diameter of 8 mm, which comprises a diaphragm, a refraction lens, a refraction/diffraction mixed lens and so on and is characterized in that a three-lens telescope reflecting objective system is provided, which adopts the refraction/ diffraction lens according to wavelength range of the cold light source to connect a 1/4''CCD with its front end. A three-lens module converts collected images into electric signals for transmission and processing through a front-end chip technology. A refraction/diffraction surface is successfully imported into the system design to improve imaging quality and minimize the lens. Common materials LACL7, BAFD5 and TAF3 are utilized to enable the system to properly rectify various monochromatic aberrations and chromatic aberrations in a waveband of 0.4 to 0.53Mum, thus ensuring aberration less than 6% in a visual field of 74 degrees. Definition of the system achieves SVGA. The system has the advantages of compact structure, fewer lens and excellent chromatic aberration, applies to medical uterine cavity diagnosis and treatment and provides a novel electronic endoscope object lens.
Description
Technical field:
The present invention relates to a kind of electric endoscope lens system, " CCD and SVGA display mode, visual field are 74 °, and external diameter is 8mm; high resolving power low distortion refraction/diffraction mixed electron endoscopic system that front end is flexible belongs to electronic endoscope imaging system to be specially adapted to 1/4.
Background technology:
Endoscopic system has experienced century-old development, and application is extensive, and fujinon electronic video endoscope obtains to use widely with the clear image true to nature and the microelectronic circuit of miniaturization now.A lot of companies have designed and have produced many fujinon electronic video endoscopes that are used for medical science diagnosis and treatment different model, as the flexible external diameter of front end that is used for the abdominal cavity diagnosis and treatment is 10mm, " the electronics sight glass system that CCD and VGA show that adopts 1/4.
System of the present invention is flexible at the front end of uterine cavity diagnosis and treatment use, and external diameter is 8mm, adopts 1/4 " and the video image dendoscope of SVGA demonstration, its corresponding optical imaging system designed.The designing requirement system front end connects 1/4 " CCD, the visual field is 74 °, then system's effective focal length is less.For obtain suitable back work distance from and big visual field, the present invention adopts anti-telephoto objective system.Reach the needs that SVGA shows for satisfying system, make camera lens lighter little, use refraction/diffraction hybrid lens so that achromatism and various monochrome differ the raising image quality better.
Summary of the invention:
The objective of the invention is on the service band of 0.4 μ m～0.53 μ m, satisfy 1/4 " under the condition of CCD front-end chip; on former five mirror dioptric system bases; refraction/diffraction hybrid system design of carrying out three mirrors comes better color difference eliminating and various monochrome to differ; improve image quality; reach SVGA to obtain resolution, maximum distortion has the optical imaging system of sufficient back work distance less than 6% under 74 ° of visual fields.
The present invention has designed one and has been applicable to 0.43 μ m～0.53 mu m waveband, and system's external diameter is 8mm, the objective system of the flexible 270 ° of adjustable fujinon electronic video endoscopes of front end.Its design object is: the depth of field is 20mm～100mm, and field angle is 74 °, and F/# is 4.4, and back work distance is 4.8mm, and the CCD diagonal angle is 1/4 ", school aberration object distance 20mm, resolution is that SVGA shows (600 * 800).
The technical scheme that the present invention is concrete:
High-resolution low distortion refraction/diffraction mixed electron endoscope lens system that this 1/4 inch SVGA shows comprises the light hurdle, refractor, and the CCD receiving plane, the even aspheric surface, as shown in Figure 1.Be characterized in: refractor 1-3 form counter take the photograph system far away have preceding a group of negative power, with settling light hurdle 1-8 on the optical axis successively, by refractor 1-10, refractor 1-13 and refractor 1-16 form counter take the photograph system far away have back a group of positive light coke, face 1-15 is the even aspheric surface, and face 1-18 is the CCD receiving plane.
Beneficial effect of the present invention: adopt the anti-system far away of taking the photograph, the field angle of back group lens combination correspondence is reduced, then its field angle of image is more much smaller than field angle of object, and useful aberration correction reaches the purpose of large aperture and big visual field simultaneously; Adopt refraction/diffraction hybrid lens, utilized light refraction and diffraction two specific characters in the air, increased the degree of freedom in the optical design process, can break through many faces that are confined to of conventional optical systems.It is crooked serious to have solved the refractive surface that achromatism brought in the dioptric system, and the problem that monochromatic aberration is big makes the total system structure lighter, littler.1-15 introduces the even aspheric surface, is quadric surface, and then better anaberration obtains high-resolution, the endoscopic picture of low distortion.
Description of drawings:
Fig. 1, Fig. 2 are the structural representations of system of the present invention.
Fig. 3 is the curvature of field and the distortion of system of the present invention.
Fig. 4 is the optical transfer function of system of the present invention.
Fig. 5 is the vertical axial aberration of system of the present invention.
Fig. 6 is the chromatic longitudiinal aberration curve map of system of the present invention.
Wherein: 1-1: object plane 1-2: plane of refraction 1-3: refractor 1-4: plane of refraction 1-5: plane of refraction 1-6: refractor 1-7: plane of refraction 1-8: light hurdle 1-9: plane of refraction 1-10: refractor 1-11: plane of refraction 1-12: plane of refraction 1-13: refractor 1-14: plane of refraction 1-15: aspheric surface refracting surface 1-16: refractor 1-17: plane of refraction 1-18:CCD accepts face
The low-distortion electronic endoscope lens system that this 1/4 inch SVGA shows comprises the light hurdle, refractor, and CCD connects The receipts face, refraction/diffraction hybrid lens. Be characterized in: refractor 1-3 and refractor 1-6 form the anti-system far away of taking the photograph Negative front group, with settling successively light hurdle 1-8 on the optical axis, by refractor 1-10, refractor 1-13 and refractor 1-16 form anti-positive rear group of taking the photograph system far away, and face 1-18 is the CCD receiving plane.
Refractor 1-3 is concavees lens, and refractor 1-6 and refractor are convex lens. Plane of refraction 1-9 is for reflecting/spreading out Penetrate face.
The selected material of each refractor of the present invention is followed successively by LACL7, BAFD5 and TAF3. According to circumstances, also can select it The material that it is suitable.
Below in conjunction with figure the present invention is described in further detail:
As Fig. 1, system architecture shown in 2, on the service band of 0.4 μ m～0.54 μ m, preceding two mirrors form this counter take the photograph system far away have preceding a group of negative power, by back three refractors form this counter take the photograph system far away have back a group of positive light coke, adopt reflection system far away to elongate back work distance.When the present invention works, the axle outer light beam of system by preceding group of divergent lens group after, the inclination angle of light and optical axis reduces greatly, causes the field angle of image of afterwards organizing the lens correspondence to diminish, better the aberration of correction system; Because the field angle of image of system is little more a lot of than field angle of object, therefore can reach the design object of large aperture and big visual field simultaneously.
Introduce the even aspheric surface at face 1-15, be quadric surface, then eliminate aberration better, make resolution reach SVGA, distortion has improved image quality well less than 4%, has the characteristics of high definition.This aspheric position can be put on the face 1-14.
The material of refractor 1-3,1-6,1-10,1-13,1-16 can be to select arbitrarily in the material of 0.4 μ m～0.54 μ m in the service band scope.
Claims (4)
1. a refraction diffraction farrago electric inter lens image-forming system is applicable to external diameter 8mm, 1/4 " video image dendoscope that CCD and SVGA show, market is 74 °, F/# is 4.4.Comprise the light hurdle, refractor, refraction/diffraction hybrid lens. it is characterized in that: refractor 1-3 forms anti-negative preceding group of taking the photograph system far away, with settling anti-positive back group of being made up of refractor 1-6 and refractor 1-10 of taking the photograph metasystem on the optical axis successively, light hurdle 1-8, CCD receiving plane 1-18.
2. refraction diffraction farrago electric inter lens image-forming system according to claim 1 is characterized in that: refractor 1-3 is concavees lens, and refractor 1-6 and refractor 1-10 are convex lens.
3. according to the described refraction diffraction farrago electric inter lens image-forming system of claim 1, it is characterized in that: the front surface 1-9 of refraction/diffraction hybrid lens 1-10 is a harmonic diffraction surfaces, and rear surface 1-11 is a sphere; The position of refraction/diffraction surfaces type 1-9 and plane of refraction 1-11 can exchange, and the substrate of refraction/diffraction surfaces type 1-8 can be plane, sphere or aspheric surface.
4. according to the described refraction diffraction farrago electric inter lens image-forming system of claim 1, the used glass material of system: refractor 1-3 is LACL7, and refractor 1-6 is BAFD5, and refractor 1-10 is TAF3.Refractor, refraction/humorous diffraction hybrid lens material can be chosen in the high other materials of wavelength band 0.4～0.53 μ m transmitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100155987A CN101140355A (en) | 2006-09-05 | 2006-09-05 | High-resolution low distortion refraction diffraction farrago electric inter lens image-forming system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100155987A CN101140355A (en) | 2006-09-05 | 2006-09-05 | High-resolution low distortion refraction diffraction farrago electric inter lens image-forming system |
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| CN101140355A true CN101140355A (en) | 2008-03-12 |
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| CNA2006100155987A Pending CN101140355A (en) | 2006-09-05 | 2006-09-05 | High-resolution low distortion refraction diffraction farrago electric inter lens image-forming system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293622A (en) * | 2011-01-06 | 2011-12-28 | 沈阳理工大学 | Optical imaging system for electronic hysteroscope |
| CN102305967A (en) * | 2011-01-06 | 2012-01-04 | 沈阳理工大学 | Wide-field and low-distortion electronic hysteroscope optical imaging system |
| CN104330867A (en) * | 2013-07-22 | 2015-02-04 | 西南技术物理研究所 | Large-aperture small-F-number optical system used for television wave band |
| CN116027521A (en) * | 2022-12-08 | 2023-04-28 | 福建福光股份有限公司 | Optical athermalization lens with anti-fog function and imaging method thereof |
-
2006
- 2006-09-05 CN CNA2006100155987A patent/CN101140355A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102293622A (en) * | 2011-01-06 | 2011-12-28 | 沈阳理工大学 | Optical imaging system for electronic hysteroscope |
| CN102305967A (en) * | 2011-01-06 | 2012-01-04 | 沈阳理工大学 | Wide-field and low-distortion electronic hysteroscope optical imaging system |
| CN104330867A (en) * | 2013-07-22 | 2015-02-04 | 西南技术物理研究所 | Large-aperture small-F-number optical system used for television wave band |
| CN116027521A (en) * | 2022-12-08 | 2023-04-28 | 福建福光股份有限公司 | Optical athermalization lens with anti-fog function and imaging method thereof |
| CN116027521B (en) * | 2022-12-08 | 2024-05-07 | 福建福光股份有限公司 | Optical athermalization lens with anti-fog function and imaging method thereof |
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