CN203217158U - Zooming optical system, objective lens system of endoscope and electronic endoscope - Google Patents
Zooming optical system, objective lens system of endoscope and electronic endoscope Download PDFInfo
- Publication number
- CN203217158U CN203217158U CN 201320211275 CN201320211275U CN203217158U CN 203217158 U CN203217158 U CN 203217158U CN 201320211275 CN201320211275 CN 201320211275 CN 201320211275 U CN201320211275 U CN 201320211275U CN 203217158 U CN203217158 U CN 203217158U
- Authority
- CN
- China
- Prior art keywords
- lens
- optical system
- varifocal optical
- varifocal
- wide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model provides a zooming optical system, an objective lens system of an endoscope and an electronic endoscope. The zooming optical system successively comprises a fixed lens set, a varifocus lens set, and a compensating lens set from an objective side along an optical axis. Specifically, the fixed lens set has a negative focal power; the varifocus lens set having a positive focal power is used for changing a focal length of the zooming optical system by using the movement of the varifocus lens set along the optical axis; and the compensating lens set having a positive focal power is used for correcting aberration generated by focal length changing by using the movement of the compensating lens set along the optical axis. According to the utility model, the advantages of large aperture, wide view field, capability of amplified observation and variable focal lengths and the like are realized.
Description
Technical field
The utility model relates to the optical image technology field, particularly relates to a kind of varifocal optical system, endoscope lens system and fujinon electronic video endoscope.
Background technology
The endoscopic imaging technology has experienced century-old development, and application is extensive, and fujinon electronic video endoscope obtains to use widely with clear image true to nature and the microelectronic circuit of miniaturization now.
Along with the testee surface appearance is observed the raising that requires, exist the active demand with scalable observation object and variable focus objective imaging system at present.For example, there is wide variation in the industrial pipeline caliber size, and when needing details amplify to observe object, perhaps in the medical science diagnosis and treatment pathology body region is amplified when observing, and all needs endoscope to have zoom function, and need not to change different objective systems.
The utility model content
Provide hereinafter about brief overview of the present utility model, in order to basic comprehension about some aspect of the present utility model is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present utility model.It is not that intention is determined key of the present utility model or pith, neither be intended to limit scope of the present utility model.Its purpose only is that the form of simplifying provides some concept, with this as the preorder of discussing after a while in greater detail.
The utility model provides a kind of varifocal optical system, endoscope lens system and fujinon electronic video endoscope with large aperture, wide visual field, scalable observation, advantage such as varifocal.
On the one hand, the utility model provides a kind of varifocal optical system, comprises successively along the optical axis of described varifocal optical system and from the thing side:
Fixed lens group has negative focal power;
Variable focus lens package has positive focal power, is used for changing by its movement along described optical axis the focal length of described varifocal optical system;
The offset lens group has positive focal power, is used for proofreading and correct because changing the aberration that focal length produces by its movement along described optical axis.
On the other hand, the utility model also provides a kind of endoscope lens system, comprises above-mentioned varifocal optical system.
Another aspect, the utility model also provide a kind of fujinon electronic video endoscope, and an end of described fujinon electronic video endoscope is provided with above-mentioned endoscope lens system.
In the technical scheme that the utility model provides, varifocal optical system adopts the anti-distance light of taking the photograph to learn imaging system, makes from the field angle of thing side offset lens group correspondence farthest to reduce useful aberration correction, wide-angle side in varifocal optical system can obtain big visual field, reaches wide-aperture purpose simultaneously; In addition, move the focal length that variable focus lens package can change varifocal optical system along optical axis, make varifocal optical system have the focusing function than high magnification, can realize the amplification of thing side is observed, image quality is better, can satisfy application demands such as medical science diagnosis and treatment, industrial pipeline inspection.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The varifocal optical system that Figure 1A-Fig. 1 C is respectively the utility model embodiment two to be provided in its operating distance be under the situation of infinite distance wide-angle side, arrange synoptic diagram between wide-angle side and the intermediateness between the end of dolly-out,ing dolly-back, the optical element of the end of dolly-out,ing dolly-back;
Fig. 2 A-Fig. 2 C is respectively present embodiment two in the wide-angle side of varifocal optical system, the longitudinal spherical aberration aberration that records respectively, astigmatism field curvature and distortion aberration;
Fig. 3 A-Fig. 3 C is respectively present embodiment two at the end of dolly-out,ing dolly-back of varifocal optical system, the longitudinal spherical aberration aberration that records respectively, astigmatism field curvature and distortion aberration;
The varifocal optical system that Fig. 4 A-Fig. 4 C is respectively the utility model embodiment three to be provided in its operating distance be under the situation of limited distance (as 30mm) wide-angle side, arrange synoptic diagram between wide-angle side and the intermediateness between the end of dolly-out,ing dolly-back, the optical element of the end of dolly-out,ing dolly-back;
Fig. 5 A-Fig. 5 C is respectively present embodiment three in the wide-angle side of varifocal optical system, the longitudinal spherical aberration aberration that records respectively, astigmatism field curvature and distortion aberration;
Fig. 6 A-Fig. 6 C is respectively present embodiment three at the end of dolly-out,ing dolly-back of varifocal optical system, the longitudinal spherical aberration aberration that records respectively, astigmatism field curvature and distortion aberration.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.The element of describing in an accompanying drawing of the present utility model or a kind of embodiment and feature can combine with element and the feature shown in one or more other accompanying drawing or the embodiment.Should be noted that for purpose clearly, omitted in accompanying drawing and the explanation and the utility model parts irrelevant, that those of ordinary skills are known and expression and the description of processing.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skills obtain under the prerequisite of not paying creative work belongs to the scope that the utility model is protected.
Embodiment one
The utility model embodiment one provides a kind of varifocal optical system, and this varifocal optical system comprises successively along its optical axis and from the thing side: fixed lens group, variable focus lens package and offset lens group.
Fixed lens group has negative focal power.Adopt negative focal power can effectively improve wide-angle side field angle scope from the nearest fixed lens group of thing side, and effectively control the maximum caliber of total system, thereby help the realization of object lens miniaturization.
Variable focus lens package has positive focal power, is used for changing by its movement along described optical axis the focal length of described varifocal optical system.For example, variable focus lens package is mobile near image planes IMG place along optical axis direction, can change the focal length of varifocal optical system.
The offset lens group has positive focal power, is used for proofreading and correct the aberration that produces because of the change focal length by its movement along described optical axis, thereby keeps the total system total length constant, realizes the amplification of thing side is observed.
The varifocal optical system that present embodiment provides is the fixed lens group with negative focal power from the nearest lens combination of thing side, other lenses group after the fixed lens group is variable focus lens package and the offset lens group of positive focal power, the anti-distance light of forming thus of taking the photograph is learned imaging system, make from the field angle of thing side offset lens group correspondence farthest and reduce, useful aberration correction, wide-angle side in varifocal optical system can obtain big visual field, reaches wide-aperture purpose simultaneously; In addition, move the focal length that variable focus lens package can change varifocal optical system along optical axis, make varifocal optical system have the zoom function than high magnification, can realize the amplification of thing side is observed, image quality is better, can satisfy application demands such as medical science diagnosis and treatment, industrial pipeline inspection.
In the technique scheme, in order to obtain wide visual angle, optional, described fixed lens group comprises refractive index N
1Lens greater than 1.8, and one of them comprises refractive index N at least in variable focus lens package and the offset lens group
2Lens greater than 1.8.
Optionally, fixed lens group comprises one first lens, and variable focus lens package comprises one second lens and one the 3rd lens, and the offset lens group comprises one the 4th lens and one the 5th lens.This scheme can be formed negative, positive, the positive anti-distance light of taking the photograph of focal power by five lens and learn imaging system, and simple and compact for structure, cost is lower.
Optionally, can aperture diaphragm be set in the about central position of varifocal optical system, as between the 4th lens and the 5th lens aperture diaphragm being set, this scheme can effectively suppress the off-axis ray in the varifocal optical system, obtains bigger aperture.
Optionally, the offset lens group can be selected the balsaming lens group for use, as the lens combination that is formed by the 4th lens and the 5th lens gummed, with compensate for chromatic aberration better in the aberration correction process.
Dolly-out, dolly-back at varifocal optical system and to look closely the restriction of angular region, can realize that object is carried out suitable amplification to be observed, optional, the utility model satisfies following formula at the visual angle tfov of the position of dolly-out,ing dolly-back of varifocal optical system:
25°≤tfov≤30° （1）
If the visual angle of wide-angle position is greater than 85 °, then system is with similar fish-eye lens, to the bigger distortion of imaging generation of thing side.Imaging causes moderate finite deformation to the thing side in order to avoid, and optional, the utility model satisfies following formula at the visual angle of the wide-angle position of varifocal optical system wfov:
76°≤wfov≤85° （2）
In actual applications, convolution (1) and formula (2) can realize wide visual angle and effective deformation extent of controlling the imaging of thing side.
Optionally, the focal distance f w of the focal distance f t of the end of dolly-out,ing dolly-back of the utility model varifocal optical system and the wide-angle side of varifocal optical system, the ratio of the two (namely becoming multiple proportions) satisfies following formula to obtain bigger angular field of view:
2.5≤ft/fw≤3.5 （3）
Optionally, for wide visual angle is provided, the focal distance f w of the back focal length fb of the wide-angle side of the utility model varifocal optical system and the wide-angle side of described varifocal optical system, the ratio of the two is restricted to less value, satisfies following formula as the two ratio:
1.2≤fb/fw≤1.8 （4）
Because the varifocal optical system that provides of the utility model adopts the anti-system far away of taking the photograph, therefore elongated the back work distance of system, thus can be by last lens of increase system and the distance between the CCD, and based on the field angle of the bigger wide-angle side of formula (4) acquisition.And during system works, the axle outer light beam is by after the variable focus lens package, and the inclination angle of light and optical axis reduces greatly, causes the field angle of image of offset lens group correspondence to diminish, better the aberration of correction system.
Too small then being difficult to of the moving range of variable focus lens package realized required change multiple proportions in the varifocal optical system, but moving range is excessive, and then more difficult aberration correction obtains higher image quality.Balance becomes multiple proportions and image quality, optionally, in the process of its end zoom of dolly-out,ing dolly-back, described variable focus lens package satisfies following formula along the ratio of the total length TOT of the adjustable extent M1 of described optical axis and described varifocal optical system to varifocal optical system of the present utility model by its wide-angle side:
0.2≤M1/TOT≤0.35 （5）。
Embodiment two
In the varifocal optical system that the utility model provides, on the basis of satisfying requirements such as focal power, each lens combination of varifocal optical system with and particular type or the shape of each lens of comprising can select according to actual needs, the utility model does not limit this, below with a certain optional implementation also in conjunction with the accompanying drawings.
The varifocal optical system that Figure 1A, Figure 1B, Fig. 1 C are respectively the utility model embodiment two to be provided in its operating distance be under the situation of infinite distance wide-angle side, arrange synoptic diagram between wide-angle side and the intermediateness between the end of dolly-out,ing dolly-back, the optical element of the end of dolly-out,ing dolly-back, wherein, operating distance is that first lenses of varifocal optical system is apart from the distance between the subject.
Shown in Figure 1A-Fig. 1 C, the varifocal optical system that present embodiment provides comprises successively along its optical axis and from thing side OBJ: fixed lens group W1, variable focus lens package W2 and offset lens group W3.
Fixed lens group W1 comprises one first lens L1.The first lens L1 is the plano-concave negative lens, and its plane is towards the thing side.
Variable focus lens package W2 comprises one second lens L2 and one the 3rd lens L3.The second lens L2 is the biconvex positive lens, and the 3rd lens L3 is that convex surface is towards the bent moon negative lens of thing side.Be provided with aperture diaphragm S between the second lens L2 and the 3rd lens L3.
Offset lens group W3 comprises one the 4th lens L4 and one the 5th lens L5.The 4th lens L4 is the biconvex positive lens, and the 5th lens L5 is that concave surface is towards the bent moon negative lens of thing side.One convex surface of biconvex positive lens and concave surface form hybrid lens towards the concave surface gummed of the bent moon negative lens of thing side, with better compensate for chromatic aberration.
Be provided with the CCD chip along the optical axis of varifocal optical system and the rear that is positioned at the 5th lens L5, can be provided with cover glass P before the CCD chip, image planes IMG tightly is positioned at after the cover glass P of CCD chip.
The varifocus objective system by wide-angle side become dolly-out, dolly-back the end during, fixed lens group W1 fixes, variable focus lens package W2 moves to thing side OBJ, offset lens group W3 while the interval that increases itself and variable focus lens package W2 to the thing side shifting until becoming intermediateness, move to thing side OBJ on one side at the interval of reducing itself and variable focus lens package W2, another limit subsequently, finally to the end of dolly-out,ing dolly-back.
The varifocal optical system that present embodiment provides is stated on the basis of embodiment one constructed effect in realization, only adopt plano-concave commonly used, biconvex, it is negative that three class ordinary lenses such as bent moon (five ordinary lenses) can be formed focal power, just, the positive anti-distance light of taking the photograph is learned imaging system, can obtain the zoom of many times (as nearly 3 times), have simple and compact for structure, lens numbers is few, be easy to processing, being easy to machinery debugs, cost is lower, the aberration correction effect is better, in whole zooming range, all more excellent image quality can be reached, the medical science diagnosis and treatment can be satisfied, application demands such as industrial pipeline inspection.
On the basis of technique scheme, this enforcement also provides the one group optional parameter of varifocal optical system thing side OBJ to each optical element between the image planes IMG, and is specifically as shown in table 1:
Table 1
| Sequence number | Radius-of-curvature r | Thickness d | Refractive index Nd | Abbe number Vd |
| OBJ | INF | INF | ||
| 1 | INF | 0.8 | 1.88 | 40.76 |
| 2 | 5.8680 | |
||
| 3 | 50.9193 | 2.7112 | 1.81 | 25.38 |
| 4 | -20.7253 | 1.8456 | ||
| S | INF | 0.22 | ||
| 6 | 4.6018 | 2.2 | 1.71 | 53.83 |
| 7 | 3.9000 | |
||
| 8 | 11.9430 | 1.2742 | 1.71 | 53.83 |
| 9 | -3.5033 | 1 | 1.81 | 25.38 |
| 10 | -12.0859 | |
||
| 11 | INF | 0.5 | 1.52 | 64.2 |
| 12 | INF | 0.15 | ||
| IMG | INF |
In the table 1, OBJ represents the thing side, and S represents aperture diaphragm, and IMG represents image planes, and INF represents infinity.
As shown in Table 1, each optical element of comprising of the varifocal optical system that provides of present embodiment is convenient to processing very much.If do not consider aspheric processing cost, in system, can also introduce aspheric surface again, better aberrations such as spherical aberration corrector, coma obtain more excellent image quality.
Table 2 has been listed variable range D1, D2 and the D3 of present embodiment varifocal optical system at its wide-angle side, intermediateness and the end of dolly-out,ing dolly-back, field angle 2 ω of varifocal optical system (°), the effective focal length EFL of varifocal optical system, and effective clear aperature (F#) of varifocal optical system number FNo.
Table 2
| Sequence number | Wide-angle side | Intermediateness | The end of dolly-out,ing dolly-back |
| D1 | 11.9012 | 4.9717 | 2.9944 |
| D2 | 0.4041 | 2.6271 | 0.3000 |
| D3 | 7.6524 | 12.3588 | 16.6632 |
| 2ω | 82 | 40 | 26 |
| EFL | 3.8781 | 7.4014 | 11.3685 |
| FNo | 3.793 | 4.984 | 6.666 |
Fig. 2 A-Fig. 2 C is respectively present embodiment two in the wide-angle side of varifocal optical system, the distortion aberration that utilizes longitudinal spherical aberration aberration and the astigmatism field curvature that wavelength records for the light beam of 656.27nm, 587.56nm and 486.13nm and the light beam that adopts wavelength 656.27nm to record respectively.Fig. 3 A-Fig. 3 C is respectively present embodiment two at the end of dolly-out,ing dolly-back of varifocal optical system, the distortion aberration that utilizes longitudinal spherical aberration aberration and the astigmatism field curvature that wavelength records for the light beam of 656.27nm, 587.56nm and 486.13nm and the light beam that adopts wavelength 656.27nm to record respectively.By Fig. 2 A-Fig. 3 C as seen, the aberration correction effect of present embodiment varifocal optical system is better, and it is less to distort, and all reaches favorable imaging quality in whole zooming range.
Embodiment three
Present embodiment is similar to above-described embodiment two, and the feature part identical with technique effect repeats no more referring to above record; The two difference comprises: the operating distance of present embodiment is limited distance (as 30mm), varifocal optical system is in its wide-angle side, between wide-angle side and the dolly-out, dolly-back intermediateness between the end, the optical element layout synoptic diagram of dolly-out,ing dolly-back and holding, shown in Fig. 4 A-Fig. 4 C under this situation.Varifocal optical system thing side OBJ is to one group of optional parameter of each optical element between the image planes IMG, and is specifically as shown in table 3:
Table 3
| Sequence number | Radius-of-curvature r | Thickness d | Refractive index Nd | Abbe number Vd |
| OBJ | INF | 30 | ||
| 1 | INF | 0.8 | 1.88 | 40.76 |
| 2 | 5.868 | D1 |
| 3 | 29.920 | 1.8 | 1.86 | 36.59 |
| 4 | -20.375 | 1.8889 | ||
| S | INF | 0.3 | ||
| 6 | 4.580 | 2.2 | 1.71 | 53.83 |
| 7 | 3.74 | |
||
| 8 | 11.749 | 2 | 1.71 | 53.83 |
| 9 | -4.215 | 1 | 1.92 | 21.51 |
| 10 | -10.00 | |
||
| 11 | INF | 0.5 | 1.52 | 64.2 |
| 12 | INF | 0.15 | ||
| IMG | INF |
In the table 3, OBJ represents the thing side, and S represents aperture diaphragm, and IMG represents image planes, and INF represents infinity.
As shown in Table 3, each optical element of comprising of the varifocal optical system that provides of present embodiment is convenient to processing very much.If do not consider aspheric processing cost, in system, can also introduce aspheric surface again, better aberrations such as spherical aberration corrector, coma obtain more excellent image quality.
Table 4 has been listed variable range D1, D2 and the D3 of present embodiment varifocal optical system at its wide-angle side, intermediateness and the end of dolly-out,ing dolly-back, field angle 2 ω of varifocal optical system (°), the effective focal length EFL of varifocal optical system, and effective clear aperature (F#) of varifocal optical system number FNo.
Table 4
| Sequence number | Wide-angle side | Intermediateness | The end of dolly-out,ing dolly-back |
| D1 | 12.1585 | 4.9559 | 3.3810 |
| D2 | 1.6045 | 3.2678 | 0.4000 |
| D3 | 6.2882 | 11.8286 | 16.2712 |
| 2ω | 82 | 40 | 26 |
| EFL | 3.6964 | 7.0634 | 9.6674 |
| FNo | 3.447 | 4.443 | 5.436 |
Fig. 5 A-Fig. 5 C is respectively present embodiment two in the wide-angle side of varifocal optical system, the distortion aberration that utilizes longitudinal spherical aberration aberration and the astigmatism field curvature that wavelength records for the light beam of 656.27nm, 587.56nm and 486.13nm and the light beam that adopts wavelength 656.27nm to record respectively.Fig. 6 A-Fig. 6 C is respectively present embodiment two at the end of dolly-out,ing dolly-back of varifocal optical system, the distortion aberration that utilizes longitudinal spherical aberration aberration and the astigmatism field curvature that wavelength records for the light beam of 656.27nm, 587.56nm and 486.13nm and the light beam that adopts wavelength 656.27nm to record respectively.By Fig. 5 A-Fig. 6 C as seen, the aberration correction effect of present embodiment varifocal optical system is better, and it is less to distort, and all reaches favorable imaging quality in whole zooming range.
By above-mentioned analysis as can be known, the varifocal optical system that the utility model embodiment provides is the fixed lens group with negative focal power from the nearest lens combination of thing side, other lenses group after the fixed lens group is variable focus lens package and the offset lens group of positive focal power, the anti-distance light of forming thus of taking the photograph is learned imaging system, make from the field angle of thing side offset lens group correspondence farthest and reduce, useful aberration correction, wide-angle side in varifocal optical system can obtain big visual field, reaches wide-aperture purpose simultaneously; In addition, move the focal length that variable focus lens package can change varifocal optical system along optical axis, make varifocal optical system have the focusing function than high magnification, can realize the amplification of thing side is observed, and have simple and compact for structurely, and lens numbers is few, and cost is lower, the aberration correction effect is better, all can reach more excellent image quality in whole zooming range.
Embodiment four
The utility model embodiment also provides a kind of objective lens optical system, and this objective lens optical system comprises the varifocal optical system that above-mentioned arbitrary embodiment provides.Owing in object lens, be provided with above-mentioned varifocal optical system, therefore can obtain larger aperture, wideer visual field, varifocal, can realize amplifying to object and observe, also be conducive to realize the miniaturization of object lens, reduce cost.
Embodiment five
The utility model embodiment also provides a kind of fujinon electronic video endoscope, and an end of this fujinon electronic video endoscope is provided with above-mentioned varifocal optical system.Can be provided with as image collecting devices such as CCD chips after last lens of varifocal optical system.In a kind of optional implementation, the object lens imaging system can comprise five ordinary lenses compositions of employing varifocal optical systems, the wide-angle side field angle of varifocal optical system (2 ω) can reach 82 degree, dolly-out, dolly-back look closely the rink corner be 26 the degree, effectively clear aperature (F#) number is about about 4, image collector is set to 1/3.6 " CCD, unit pixel is of a size of 6 μ m * 6 μ m.
Because the above-mentioned advantage that the object lens imaging system that fujinon electronic video endoscope one end is provided with has, therefore the endoscope universality is stronger, need not to change different object lens imaging systems in actual use and can satisfy and exist wide variation and needs details to amplify to observe in thing or the medical science diagnosis and treatment as the industrial pipeline caliber size pathology body region is amplified practical application request such as observation.
In the utility model the various embodiments described above, the sequence number of embodiment and/or sequencing only are convenient to describe, and do not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, and does not have the part of detailed description among certain embodiment, can be referring to the associated description of other embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM (read-only memory) (Read-Only Memory is called for short ROM), random access memory (Random Access Memory is called for short RAM), magnetic disc or CD.
In embodiment such as apparatus and method of the present utility model, obviously, after can decomposing, make up and/or decompose, each parts or each step reconfigure.These decomposition and/or reconfigure and to be considered as equivalents of the present utility model.Simultaneously, in the above in the description to the utility model specific embodiment, can in one or more other embodiment, use in identical or similar mode at the feature that a kind of embodiment is described and/or illustrated, combined with the feature in other embodiment, or the feature in alternative other embodiment.
Should emphasize that term " comprises/comprise " existence that refers to feature, key element, step or assembly when this paper uses, but not get rid of the existence of one or more further feature, key element, step or assembly or additional.
It should be noted that at last: though above the utility model and the advantage thereof of having described in detail is to be understood that and can carries out various changes, alternative and conversion under the situation that does not exceed the spirit and scope of the present utility model that limited by appended claim.And scope of the present utility model is not limited only to the specific embodiment of the described process of instructions, equipment, means, method and step.The one of ordinary skilled in the art will readily appreciate that from disclosure of the present utility model, can use according to the utility model and carry out and process, equipment, means, method or the step essentially identical function of corresponding embodiment described herein or acquisition result essentially identical with it, existing and that will be developed in the future.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (15)
1. a varifocal optical system is characterized in that, comprises successively along the optical axis of described varifocal optical system and from the thing side:
Fixed lens group has negative focal power;
Variable focus lens package has positive focal power, is used for changing by its movement along described optical axis the focal length of described varifocal optical system;
The offset lens group has positive focal power, is used for proofreading and correct because changing the aberration that focal length produces by its movement along described optical axis.
2. varifocal optical system according to claim 1 is characterized in that:
Described fixed lens group comprises one first lens, and described variable focus lens package comprises one second lens and one the 3rd lens, and described offset lens group comprises one the 4th lens and one the 5th lens.
3. varifocal optical system according to claim 2 is characterized in that, is provided with aperture diaphragm between described second lens and described the 3rd lens.
4. varifocal optical system according to claim 2 is characterized in that, described the 4th lens and described the 5th lens gummed.
5. varifocal optical system according to claim 2 is characterized in that, described first lens are the plano-concave negative lens, and its plane is towards the thing side.
6. varifocal optical system according to claim 2 is characterized in that, described second lens are the biconvex positive lens, and described the 3rd lens are that convex surface is towards the bent moon negative lens of thing side.
7. varifocal optical system according to claim 2 is characterized in that, described the 4th lens are the biconvex positive lens, and described the 5th lens are that concave surface is towards the bent moon negative lens of thing side.
8. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that:
Visual angle tfov in the position of dolly-out,ing dolly-back of described varifocal optical system satisfies: 25 °≤tfov≤30 °.
9. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that: the visual angle wfov at the wide-angle position of described varifocal optical system satisfies:
76°≤wfov≤85°。
10. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that:
The focal distance f w of the focal distance f t of the end of dolly-out,ing dolly-back of described varifocal optical system and the wide-angle side of described varifocal optical system, the ratio of the two satisfies: 2.5≤ft/fw≤3.5.
11. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that:
The focal distance f w of the back focal length fb of the wide-angle side of described varifocal optical system and the wide-angle side of described varifocal optical system, the ratio of the two satisfies: 1.2≤fb/fw≤1.8.
12. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that:
Described variable focus lens package is along the adjustable extent M1 of described optical axis and the total length TOT of described varifocal optical system, and the ratio of the two satisfies: 0.2≤M1/TOT≤0.35.
13. according to the arbitrary described varifocal optical system of claim 1-7, it is characterized in that:
Described fixed lens group comprises refractive index greater than 1.8 lens, and one of them comprises that refractive index is greater than 1.8 lens at least in described variable focus lens package and the offset lens group.
14. an endoscope lens system is characterized in that, comprises arbitrary described varifocal optical system as claim 1-13.
15. a fujinon electronic video endoscope is characterized in that, an end of described fujinon electronic video endoscope is provided with endoscope lens as claimed in claim 14 system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320211275 CN203217158U (en) | 2013-04-23 | 2013-04-23 | Zooming optical system, objective lens system of endoscope and electronic endoscope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320211275 CN203217158U (en) | 2013-04-23 | 2013-04-23 | Zooming optical system, objective lens system of endoscope and electronic endoscope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203217158U true CN203217158U (en) | 2013-09-25 |
Family
ID=49206683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320211275 Expired - Fee Related CN203217158U (en) | 2013-04-23 | 2013-04-23 | Zooming optical system, objective lens system of endoscope and electronic endoscope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203217158U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122659A (en) * | 2013-04-23 | 2014-10-29 | 张梅 | Zooming optical system, endoscope objective lens system, and electronic endoscope |
| CN106377220A (en) * | 2016-10-13 | 2017-02-08 | 成都英赛景泰光电技术有限公司 | Optical imaging method, optical imaging system and capsule type medical equipment |
| CN106461919A (en) * | 2014-10-30 | 2017-02-22 | 奥林巴斯株式会社 | Objective optical system for endoscope |
| CN108873275A (en) * | 2018-06-11 | 2018-11-23 | 青岛奥美克医疗科技有限公司 | Zoom adapter optical system, zoom adapter and endoscopic system |
| CN114994902A (en) * | 2022-06-28 | 2022-09-02 | 福建光旭科技有限公司 | Endoscope with replaceable working environment |
-
2013
- 2013-04-23 CN CN 201320211275 patent/CN203217158U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122659A (en) * | 2013-04-23 | 2014-10-29 | 张梅 | Zooming optical system, endoscope objective lens system, and electronic endoscope |
| CN106461919A (en) * | 2014-10-30 | 2017-02-22 | 奥林巴斯株式会社 | Objective optical system for endoscope |
| CN106461919B (en) * | 2014-10-30 | 2018-12-11 | 奥林巴斯株式会社 | Objective lens optical system for endoscope |
| CN106377220A (en) * | 2016-10-13 | 2017-02-08 | 成都英赛景泰光电技术有限公司 | Optical imaging method, optical imaging system and capsule type medical equipment |
| CN108873275A (en) * | 2018-06-11 | 2018-11-23 | 青岛奥美克医疗科技有限公司 | Zoom adapter optical system, zoom adapter and endoscopic system |
| CN108873275B (en) * | 2018-06-11 | 2020-12-29 | 青岛奥美克医疗科技有限公司 | Zoom adapter optical system, zoom adapter, and endoscope system |
| CN114994902A (en) * | 2022-06-28 | 2022-09-02 | 福建光旭科技有限公司 | Endoscope with replaceable working environment |
| CN114994902B (en) * | 2022-06-28 | 2023-06-23 | 福建光旭科技有限公司 | Endoscope capable of changing working environment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103389571B (en) | Telephoto zoom lens system and photographing apparatus having the same | |
| CN203217158U (en) | Zooming optical system, objective lens system of endoscope and electronic endoscope | |
| JP5450028B2 (en) | Imaging lens and imaging apparatus | |
| JP4776948B2 (en) | Variable magnification optical system | |
| JP4903418B2 (en) | Zoom lens | |
| CN103309025B (en) | Zoom lens and the capture apparatus including the zoom lens | |
| JP6706737B2 (en) | Zoom lens system, imaging device, camera | |
| CN104122659A (en) | Zooming optical system, endoscope objective lens system, and electronic endoscope | |
| JPWO2015146067A1 (en) | Zoom lens system, interchangeable lens device, and camera system | |
| CN105319700A (en) | Eyepiece lens and imaging apparatus | |
| CN104094152B (en) | Pick-up lens and camera head | |
| JPWO2013153793A1 (en) | Zoom lens and imaging device | |
| JP2018146855A (en) | Zoom lens and image capturing device | |
| CN209044175U (en) | Imaging lens and photographic device | |
| CN104865683A (en) | Zoom lens and imaging apparatus | |
| CN103424845A (en) | Telephoto lens system | |
| JP2017146588A (en) | Zoom lens system, interchangeable lens device and camera system with zoom lens system, and imaging apparatus with zoom lens system | |
| CN103309026A (en) | Fish eye lens system and photographing apparatus including the same | |
| CN101408666A (en) | Rear-focusing type zoom lens and imaging apparatus | |
| CN104094157A (en) | Super-wide angle lens, and imaging device | |
| CN105074531A (en) | Enlarging endoscope optical system | |
| JP6711361B2 (en) | Imaging lens | |
| JP2016045491A (en) | Zoom lens system, image capturing device, and camera | |
| JP2016173481A (en) | Zoom lens and imaging apparatus | |
| CN103917910A (en) | Object lens for endoscope, and endoscope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130925 Termination date: 20210423 |