CN108873275A - Zoom adapter optical system, zoom adapter and endoscopic system - Google Patents
Zoom adapter optical system, zoom adapter and endoscopic system Download PDFInfo
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- CN108873275A CN108873275A CN201810596241.5A CN201810596241A CN108873275A CN 108873275 A CN108873275 A CN 108873275A CN 201810596241 A CN201810596241 A CN 201810596241A CN 108873275 A CN108873275 A CN 108873275A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims description 19
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000003384 imaging method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 2
- 206010070834 Sensitisation Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
- G02B23/2407—Optical details
- G02B23/2423—Optical details of the distal end
- G02B23/243—Objectives for endoscopes
- G02B23/2438—Zoom objectives
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Lenses (AREA)
- Instruments For Viewing The Inside Of Hollow Bodies (AREA)
Abstract
Present disclose provides a kind of zoom adapter optical systems, from the object side to the image side successively include focusing lens group, fixed lens group, variable focus lens package and compensation lens group, focusing lens group carries out focusing processing according to object distance, to obtain clear image；Fixed lens group remains unchanged position during focusing processing is with zoom processing；Variable focus lens package is used to carry out linear movement so that image enlargement ratio is changed along optical axis direction；And compensation lens group carries out nonlinear moving along optical axis direction and is moved with compensating the focal position under different enlargement ratios.
Description
Technical Field
The present disclosure relates to a zoom adapter optical system, a control method thereof, a zoom adapter, and an endoscope system.
Background
The adapter is used for cooperating with the endoscope, connects camera device simultaneously, transmits the image that the endoscope detected to camera device on, and the person of being convenient for observes better.
In the process of using the endoscope, the image with single magnification ratio is difficult to meet the use requirement, so that a zoom adapter is needed, and the image with different magnification ratios can be presented for the user to observe, for example, application number CN200420020588.9 provides a zoom adapter. However, in the existing zoom adapter, after the magnification is changed each time, manual focusing is required again to obtain a clear image, which causes inconvenience to users and reduces efficiency.
Disclosure of Invention
In view of at least one of the above technical problems, the present disclosure provides a zoom adapter optical system, a control method thereof, a zoom adapter, and an endoscope system.
According to a first aspect of the present disclosure, there is provided a zoom adapter optical system for performing focusing processing and zooming processing, and including, in order from an object side to an image side, a focusing lens group, a fixed lens group, a zooming lens group, and a compensation lens group, the focusing lens group performing focusing processing according to an object distance to obtain a clear image at the object distance;
the position of the fixed lens group is kept unchanged in the process of focusing and zooming;
the zoom lens group is used for carrying out linear movement along the optical axis direction so as to change the image magnification; and
the compensation lens group performs nonlinear movement in the optical axis direction to compensate for focus position movement at different magnifications.
According to at least one embodiment of the present disclosure, when the object distance is constant and the magnification is changed, the position of the focus lens group is kept constant, and the zoom lens group and the compensation lens group are linked, wherein the zoom lens group is linearly moved in the optical axis direction and the compensation lens group is non-linearly moved in the optical axis direction, so that clear images at different magnifications are obtained.
According to at least one embodiment of the present disclosure, when an object distance is changed, a focus lens group is moved to perform a focus process to obtain a clear image at the changed object distance.
According to at least one embodiment of the present disclosure, the movement of the focus lens group is a linear movement.
According to at least one embodiment of the present disclosure, both ends of the zoom adapter optical system are provided with a front protective sheet and a rear protective sheet, respectively.
According to at least one embodiment of the present disclosure, a distance between the fixed lens group and the zoom lens group is L1The distance between the zoom lens group and the compensation lens group is L2The distance between the compensation lens group and the rear protection plate is L3，
L when the zoom lens group and the compensation lens group are linked when the object distance is constant and the magnification is changed1、L2、L3The relationship between:
wherein,represents L1The vector of the change is such that,represents L2The vector of the change is such that,represents L3A vector of changes.
According to a second aspect of the present disclosure, there is provided a control method of a zoom adapter optical system including, in order from an object side to an image side, a focus lens group, a fixed lens group that is fixed, a zoom lens group, and a compensation lens group,
adjusting a focusing lens group according to the object distance so as to perform focusing processing to obtain a clear image at the object distance; and
and under the condition that the object distance is unchanged and the magnification is changed, keeping the position of the focusing lens group unchanged, and enabling the zooming lens group and the compensation lens group to be linked for zooming, wherein the zooming lens group is enabled to move linearly along the optical axis direction and the compensation lens group is enabled to move nonlinearly along the optical axis direction, so that clear images under different magnifications are ensured to be obtained continuously.
According to a third aspect of the present disclosure, there is provided a zoom adapter to which the above-described zoom adapter optical system is applied.
According to a fourth aspect of the present disclosure, there is provided an endoscope system comprising:
an endoscope placed inside an object to be examined;
an imaging device for obtaining an internal image of a subject; and
the zoom adapter is used for connecting the endoscope and the camera device.
According to at least one embodiment of the present disclosure, an image pickup apparatus includes a CMOS photosensitive device or a CCD photosensitive device.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a schematic structural diagram according to some embodiments of the present disclosure.
FIG. 2 is a diagram illustrating a linkage track of a zoom lens group and a compensation lens group according to an embodiment of the present disclosure.
In the figure: 1 is a focusing lens group; 2 is a fixed lens group; 3 is a zoom lens group; 4 is a compensation lens group; 5 is a front protective sheet; 6 is a rear protective sheet; and 7 is the optical axis.
Detailed Description
The present disclosure will be described in further detail with reference to the drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the present disclosure. It should be further noted that, for the convenience of description, only the portions relevant to the present disclosure are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Zooming refers to zooming in and out of an image by changing a focal length, and focusing refers to adjusting a position of a focal point so as to make the image clearer. In the conventional zoom adapter, in order to change the image magnification, it is necessary to manually zoom and then focus again to obtain a clear image, and two knobs need to be operated respectively.
The structure of the adapter optical system of some embodiments of the present disclosure is shown in fig. 1. As shown in fig. 1, a focusing lens group 1, a fixed lens group 2, a zooming lens group 3, and a compensation lens group 4 may be included in order from an object side to an image side. The four lens groups are sequentially arranged along the optical axis 7, and each lens group can adopt an existing cemented lens group or a combined lens, which is not limited by the present disclosure.
The focusing lens group 1 is independently arranged, the moving track of the focusing lens group 1 on the optical axis 7 is a linear moving track, and the adapter is focused for the first time by controlling the movement of the focusing lens group 1. The user adjusts the focusing lens assembly 1 to focus to obtain a clear image, and in the subsequent zooming process, the focusing lens assembly 1 is fixed.
The fixed lens group 2 is fixed during zooming and focusing, and the distance between the fixed lens group and a photosensitive device (such as a CCD photosensitive device or a CMOS photosensitive device) is kept constant.
The zoom lens group 3 and the compensation lens group 4 are linked in the moving process. The zoom lens group 3 and the compensation lens group 4 are simultaneously moved in association with each other, for example, by control knobs of the zoom lens group 3 and the compensation lens group 4. The zoom lens group 3 is used for zooming, and the zoom lens group 3 moves to enlarge or reduce the image display magnification. And the compensation lens group 4 is linked with the zoom lens group 3 in the zooming process and is used for compensating the position movement of the focus in the zooming process, so that the continuous and clear image is kept.
The zoom lens group 3 and the compensation lens group 4 are linked according to respective moving tracks during zooming, wherein the moving track of the zoom lens group 3 in the direction of the optical axis 7 is a linear moving track, and the change of the image magnification is realized. The compensation lens group 4 moves according to a nonlinear movement track to compensate the position movement of the focus in the zooming process, so that continuous focusing is realized, and continuous and clear images are ensured.
According to some embodiments of the present disclosure, the front protection sheet 5 and the rear protection sheet 6 are respectively fixedly disposed at both ends of the adapter, and the front protection sheet 5 and the rear protection sheet 6 may be used to protect the lens group, prevent dust or prevent lens loss. The protective sheet may be, for example, a general glass mirror, a UV mirror, or the like, and the present disclosure is not limited thereto.
In some embodiments of the present disclosure, as shown in fig. 1, let: the distance between the fixed lens group 2 and the variable focus lens group 3 is L1The distance between the zoom lens group 3 and the compensation lens group 4 is L2The distance between the compensation lens group 4 and the rear protection sheet 6 is L3During zooming L1、L2、L3Always satisfy L1Always has a movement distance equal to L2And L3The vector sum of (a) is:
wherein,represents L1The vector of the change is such that,represents L2The vector of the change is such that,represents L3A vector of changes. As shown in FIG. 2, during zooming, the zoom lens group 3 and the compensation lens group 4 are linked, when L is1L of the compensation lens group 4 moving along a non-linear curved track when linear variation is small3Gradually becomes larger, after reaching the peak, L3The value of (c) becomes gradually smaller. Through the matching and the movement of the four groups of lenses, the photosensitive device can capture a focus all the time under different magnification factors, so that a clear image can be obtained.
For example: fig. 2 shows a diagram of the linkage locus of the zoom lens group 3 and the compensation lens group 4 in an alternative embodiment of the present disclosure. In fig. 2, the X axis represents the angle (°) of rotation of the knob for controlling zooming, and the Y axis represents the distance of movement (mm), as shown in fig. 2, at L1Points a, b and c are respectively taken on the curve of (A),
when L is1When changing from point a to point b, L1Has a Y-axis variation of-Y1，L2Has a Y-axis variation of Y2，L3Has a Y-axis variation of Y3At this time
|-y1|＝|y2+y3|
When L is1When changing from point b to point c, L1Has a Y-axis variation of-Y1，L2Has a Y-axis variation of Y2，L3Has a Y-axis variation of-Y3At this time
|-y1|＝|y2-y3|
It should be noted that the data, the slope of the curve, the motion track, etc. in the present embodiment are only for convenience of specifically describing the technical solution of the present disclosure, and are not used to limit the present disclosure, and it should be clear to those skilled in the art that according to the technical solution of the present disclosure, other suitable track curves different from the track curve shown in fig. 2 may also be used, and only L is needed1Is linearly varied and L3It may be a nonlinear change. And all such trajectory curves are intended to fall within the scope of the present disclosure. For example: l is1Linear curves with other slopes can be correspondingly set according to the specific working stroke of the knob; l is3The corresponding nonlinear curves with other slopes can be obtained through simulation of traditional optical design software according to the specific working stroke of each lens group. However, these other curve track relationships representing the linkage between the zoom lens assembly 3 and the compensation lens assembly 4 all belong to the protection scope of the present disclosure, and the present disclosure will not describe any further other embodiments, and those skilled in the art can implement the present embodiment by using a set of curve tracks and corresponding data shown in fig. 2.
The present disclosure also provides a method for controlling an optical system of the zoom adapter, including the following steps:
adjusting a focusing lens group to perform focusing processing so as to obtain a clear image at the object distance;
when the object distance is unchanged and the magnification is changed, the position of the focusing lens group is kept unchanged, so that the zooming lens group and the compensation lens group are linked to carry out zooming processing, wherein the linkage relation of the zooming lens group and the compensation lens group can be realized by adopting the track curve, and clear images under different magnifications can be continuously obtained.
And in one embodiment of the above method of the present disclosure, when the object distance changes, adjusting the focusing lens group to perform the focusing process to obtain a clear image at different object distances. And for a certain fixed object distance, when the magnification is changed, the focusing lens group can be kept unchanged, and the zooming lens group and the compensation lens group are linked in the manner described above to carry out zooming processing.
The present disclosure also provides a zoom adapter including the above optical system, the zoom adapter being used to connect an endoscope and an image pickup apparatus.
In some embodiments, the object distance of the zoom adapter is ∞ 300mm, within which the adapter can obtain a continuous clear image during zooming without requiring refocusing at a fixed object distance.
In some embodiments, the zoom adapter of the present disclosure can be used for an endoscope for operation, and the present disclosure can obtain clear images under white light and near infrared light (400 nm-900 nm) illumination, and when the white light and near infrared light illumination are switched in operation, the user does not need to focus again, so that the efficiency is improved, and the imaging parfocal property is good.
The present disclosure also provides an endoscope system including an endoscope for placement inside a subject such as a human body, a workpiece, etc., an image pickup device for obtaining an internal image of the subject, and the above-described zoom adapter for connecting the endoscope and the image pickup device.
In some embodiments, the imaging device comprises a CMOS light sensing device or a CCD light sensing device.
According to the technical scheme of this disclosure, the focusing adapter can demonstrate the image of different magnifications, and convenience of customers observes, and under the unchangeable condition of object distance after focusing for the first time simultaneously, can realize continuously zooming the in-process and continuously obtain clear image, need not focusing once more, and more convenience of customers uses, has improved the availability factor, is applicable to multiple sensitization device simultaneously, and the practicality is strong.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.
Claims (10)
1. A zoom adapter optical system, characterized in that the optical system is used for performing a focusing process and a zooming process, and comprises a focusing lens group, a fixed lens group, a zooming lens group, and a compensation lens group in this order from an object side to an image side,
the focusing lens group carries out focusing processing according to the object distance to obtain a clear image at the object distance;
the position of the fixed lens group is kept unchanged in the process of the focusing processing and the zooming processing;
the zoom lens group is used for performing linear movement along the optical axis direction so as to change the image magnification; and
the compensation lens group moves nonlinearly along the optical axis direction to compensate for the movement of the focal position at different magnifications.
2. The zoom adapter optical system according to claim 1,
and under the condition that the object distance is unchanged and the magnification is changed, the position of the focusing lens group is kept unchanged, and the zooming lens group and the compensating lens group are linked, wherein the zooming lens group moves linearly along the optical axis direction and the compensating lens group moves nonlinearly along the optical axis direction, so that clear images under different magnifications are obtained.
3. Zoom adapter optical system according to claim 1 or 2,
and when the object distance is changed, the focusing lens group moves along the optical axis direction to perform focusing processing so as to obtain a clear image at the changed object distance.
4. Zoom adapter optical system according to claim 3,
the movement of the focusing lens group is linear movement.
5. The zoom adapter optical system according to claim 4, wherein both ends of the zoom adapter optical system are provided with a front protective sheet and a rear protective sheet, respectively.
6. Zoom adapter optical system according to claim 5,
the distance between the fixed lens group and the zoom lens group is L1The distance between the zoom lens group and the compensation lens group is L2The distance between the compensation lens group and the rear protection plate is L3，
When the object distance is unchanged and the magnification is changed, under the condition that the zoom lens group and the compensation lens group are linked, the L is1、L2、L3The relationship between them is:
wherein,represents L1The vector of the change is such that,represents L2The vector of the change is such that,represents L3A vector of changes.
7. A control method of an optical system of a zoom adapter is characterized in that the optical system comprises a focusing lens group, a fixed lens group, a zooming lens group and a compensation lens group in sequence from an object side to an image side,
adjusting the focusing lens group according to the object distance so as to perform focusing processing to obtain a clear image at the object distance; and
and under the condition that the object distance is unchanged and the magnification is changed, keeping the position of the focusing lens group unchanged, and enabling the zooming lens group and the compensation lens group to be linked for zooming, wherein the zooming lens group is enabled to move linearly along the optical axis direction and the compensation lens group is enabled to move nonlinearly along the optical axis direction, so that clear images under different magnifications are ensured to be obtained continuously.
8. A zoom adapter characterized by comprising a zoom adapter optical system according to any one of claims 1 to 6.
9. An endoscopic system, comprising:
an endoscope placed inside an object to be examined;
an imaging device for obtaining an internal image of the subject; and
the zoom adapter of claim 8, configured to connect the endoscope and the camera device.
10. The endoscopic system of claim 9, wherein the imaging device comprises a CMOS light sensing device or a CCD light sensing device.
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| CN201810596241.5A CN108873275B (en) | 2018-06-11 | 2018-06-11 | Zoom adapter optical system, zoom adapter, and endoscope system |
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| CN201810596241.5A CN108873275B (en) | 2018-06-11 | 2018-06-11 | Zoom adapter optical system, zoom adapter, and endoscope system |
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| CN108873275B CN108873275B (en) | 2020-12-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110515191A (en) * | 2019-06-10 | 2019-11-29 | 苏州精观医疗科技有限公司 | Microscopy endoscopic imaging method and system |
| CN112099212A (en) * | 2020-10-12 | 2020-12-18 | 淄博海泰新光光学技术有限公司 | Endoscope adapter optical system of internal focusing |
| CN112180574A (en) * | 2020-10-30 | 2021-01-05 | 重庆西山科技股份有限公司 | Endoscope adaptive lens |
| CN114355605A (en) * | 2022-03-07 | 2022-04-15 | 之江实验室 | Simultaneous zoom coupler, optical imaging lens group and endoscope system thereof |
| CN114859544A (en) * | 2022-03-29 | 2022-08-05 | 青岛大学附属医院 | Endoscope focusing control method and system |
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