CN1965750A - Low-distortion electronic endoscope imaging system with 1/4 inch CCD and SVGA display - Google Patents
Low-distortion electronic endoscope imaging system with 1/4 inch CCD and SVGA display Download PDFInfo
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- CN1965750A CN1965750A CN 200510016041 CN200510016041A CN1965750A CN 1965750 A CN1965750 A CN 1965750A CN 200510016041 CN200510016041 CN 200510016041 CN 200510016041 A CN200510016041 A CN 200510016041A CN 1965750 A CN1965750 A CN 1965750A
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- refractor
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- aspheric surface
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Abstract
The invention relates to an object lens of electric endoscope, used in the electric system which uses metal halide as cold light source, front end bended with 8mm diameter, and uses 1/4''CCD, wherein it comprises stop, refractive lens, and aspheric lens; based on the wavelength range of cold light source, the demand on 20mm-100mm field depth, the size of CCD, and the SVGA display, it designs one five-let reverse-telephoto objective system. It uses five lenses, uses the front chip to convert image into electric signal to be transmitted and stored; and it uses aspheric surface to improve the image quality. The invention uses common materials as LACL7, BAFDS, FDS3, TAF3 and TAC4. It can correct single-color aberration and chromic aberration in 0.4-0.53 mum while the deformation in 74degree view field is lower than 4%, and resolution can reach SVGA.
Description
Technical field:
The present invention relates to a kind of electric endoscope lens system, be specially adapted to 1/4 that " CCD and SVGA show that the visual field is 74 °, and external diameter is 8mm, and the high-resolution low-distortion electronic endoscopic system that front end is flexible belongs to electronic endoscope imaging system.
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 depth of field 20mm-100mm of designing requirement system, preceding termination 1/4 " CCD, the visual field is 74 °, then system's effective focal length is less.Adopt anti-telephoto objective system for obtaining suitable back work distance from, the present invention.Reach the needs that SVGA shows for satisfying system, introduce aspheric surface, improve image quality so that anaberration better reduces distortion.
Summary of the invention:
The objective of the invention is satisfying depth of field 20mm-100mm, 1/4 " CCD front-end chip] condition under; adopt five mirrors and simple glass; introduce aspheric surface and improve image quality; reach SVGA to obtain resolution; maximum distortion has the optical imaging system of sufficient back work distance less than 4% under 74 ° of visual fields.
The present invention has designed one and has been applicable to that external diameter is 8mm, the objective system of the fujinon electronic video endoscope that flexible 270 degree of front end are adjustable.Its design object is: the depth of field is 20mm～100mm, and the angle of visual field is 74 °, and F/# is 3.1, 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:
The low-distortion electronic 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 and refractor 1-6 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 angle of visual field of back group battery of lens 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; Introduce the even aspheric surface at face 1-15, be quadratic surface, then better anaberration obtains high-resolution, low distored endoscopic picture.
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.
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, CCD receiving plane, even aspheric surface.Be characterized in: refractor 1-3 and refractor 1-6 form the counter minus preceding group of taking the photograph system far away, with settling light hurdle 1-8 on the optical axis successively, form anti-positive back group of taking the photograph system far away by refractor 1-10, refractor 1-13 and refractor 1-16, face 1-18 is the CCD receiving plane.
Refractor 1-3 and refractor 1-10 are concavees lens, and refractor 1-6, refractor 1-13 and refractor 1-16 are convex lenss.Plane of refraction 1-15 is the even aspheric surface.
The selected material of each refractor of the present invention is followed successively by LACL7, BAFD5, FDS3, TAF3 and TAC4.According to circumstances, also can select other suitable material.
Below in conjunction with figure the present invention is described in further detail:
As Fig. 1, system structure 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 quadratic surface, then eliminate aberration better, make resolution reach SVGA, distortion has improved image quality well less than 4%, has the characteristics of fine 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. an electric endoscope lens system is applicable to external diameter 8mm rigidity mirror pipe, 1/4 " video image dendoscope that CCD and SVGA show, the visual field is 74 °, F/# is 3.1.Comprise light hurdle, refractor, aspheric surface.It is characterized in that: refractor 1-3 and refractor 1-6 form the counter minus preceding group of taking the photograph system far away, with settling light hurdle 1-8 on the optical axis successively, by anti-positive back group of taking the photograph metasystem that refractor 1-10, refractor 1-13 and refractor 1-16 form, 1-18 is the CCD receiving plane.
2. according to the described electric endoscope lens of claim 1 system, it is characterized in that: refractor 1-3 and refractor 1-10 are concavees lens, and refractor 1-6, refractor 1-13 and refractor 1-16 are convex lenss.
3. according to the described electric endoscope lens of claim 1 system, it is characterized in that: plane of refraction 1-15 is the even aspheric surface.
4. according to the described electric endoscope lens of claim 1 system, the used glass material of system: refractor 1-3 is LACL7, and refractor 1-6 is BAFD5, and refractor 1-10 is FDS3, and refractor 1-13 is TAF3, and refractor 1-16 is TAC4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510016041 CN1965750A (en) | 2005-11-14 | 2005-11-14 | Low-distortion electronic endoscope imaging system with 1/4 inch CCD and SVGA display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510016041 CN1965750A (en) | 2005-11-14 | 2005-11-14 | Low-distortion electronic endoscope imaging system with 1/4 inch CCD and SVGA display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1965750A true CN1965750A (en) | 2007-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510016041 Pending CN1965750A (en) | 2005-11-14 | 2005-11-14 | Low-distortion electronic endoscope imaging system with 1/4 inch CCD and SVGA display |
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| CN (1) | CN1965750A (en) |
Cited By (2)
| 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 |
| CN106016060A (en) * | 2016-05-19 | 2016-10-12 | 深圳磊明科技有限公司 | Linear lighting space effect lamp |
-
2005
- 2005-11-14 CN CN 200510016041 patent/CN1965750A/en active Pending
Cited By (2)
| 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 |
| CN106016060A (en) * | 2016-05-19 | 2016-10-12 | 深圳磊明科技有限公司 | Linear lighting space effect lamp |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20070523 |