CN108761766B - Endoscope objective lens with optical amplification function - Google Patents
Endoscope objective lens with optical amplification function Download PDFInfo
- Publication number
- CN108761766B CN108761766B CN201810534537.4A CN201810534537A CN108761766B CN 108761766 B CN108761766 B CN 108761766B CN 201810534537 A CN201810534537 A CN 201810534537A CN 108761766 B CN108761766 B CN 108761766B
- Authority
- CN
- China
- Prior art keywords
- lens
- radius
- mirror surface
- mirror
- plane
- 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.)
- Active
Links
Classifications
-
- 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
-
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
Abstract
The invention discloses an endoscope objective lens with an optical amplifying function, which sequentially comprises a negative group, a focusing group and a positive group from an object side to an image side, wherein the focusing group can move along an optical axis under the tension of a traction steel wire, and after the tension is released, the focusing group is restored to an original position under the action of a spring, so that the state adjustment of conventional imaging-close-range amplifying imaging-conventional imaging can be realized. The endoscope objective has the advantages of compact structure, small number of sheets, short optical amplification moving distance, and focusing group moving distance of only 0.2mm, reduces the stroke of an actuating mechanism, and can meet the requirements of large-view-field and high-definition endoscopic imaging in conventional imaging and optical amplification imaging.
Description
Technical Field
The present invention relates to an endoscope objective lens, and more particularly, to an endoscope objective lens having an optical magnification function.
Background
The magnifying endoscope can magnify the gastric mucosa by tens of times or hundreds of times, can observe the small change of the surface concave structure of the gastric mucosa gland and the shape and characteristics of the mucosa microvascular network, can be used for identifying the benign and malignant of gastric mucosa lesions, and has important clinical application value. However, the optical magnifying endoscope can be accompanied by a significant reduction in the field angle when implementing the magnifying observation function, for example, the field angle of the GIF-H290Z gastroscope of Olympus, japan is 140 degrees when imaging in a conventional manner, the field angle of the GIF-H290Z gastroscope is sacrificed to 95 degrees when imaging in a magnified manner, and the field angle of the EG-590ZW gastroscope of Fujinone, japan, is sacrificed from 140 degrees when imaging in a conventional manner to 55 degrees when imaging in a magnified manner.
The endoscope lens with the magnifying function is a key component of the magnifying endoscope, ensures high definition, realizes a large field angle at the same time, and can perform optical zoom magnification, which is very challenging in optical design. The large field angle has obvious effect on endoscope clinic, especially on observing side wrinkled intestinal wall by enteroscopy. The optical amplification and the narrow-band light imaging can improve the diagnosis rate of early lesions. In addition, the endoscope magnification imaging technology solves the contradiction that a certain depth of field is sacrificed to improve the resolution for the optical design of the high-definition objective lens.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the endoscope objective lens with the optical amplification function, which has compact structure, less number of sheets, short optical amplification moving distance and less sacrifice of the conventional imaging and amplified imaging field angle.
The invention relates to an endoscope objective lens with an optical amplifying function, which comprises a lens barrel, wherein a first cemented lens, a first space ring, a first positive lens, a second space ring and a third cemented lens are sequentially attached from an object side to an image side in the lens barrel; the first cemented lens comprises a plane lens and a first negative lens from the object space to the image space, wherein the two planes of the plane lens are planes, the first negative lens faces the object space to be planes, and the first negative lens faces the image space to be concave; the second cemented lens comprises a second negative lens and a second positive lens, the second negative lens is convex towards the object side, is concave towards the image side, and both surfaces of the second positive lens are convex; both surfaces of the first positive lens are convex surfaces; the third cemented lens comprises a third positive lens and a third negative lens, wherein both surfaces of the third positive lens are convex surfaces, the third negative lens is concave towards the object side, and convex towards the image side; the adjusting cylinder simultaneously plays a role of an aperture diaphragm, and the size of the aperture diaphragm of the system is ensured to be unchanged when the adjusting cylinder moves forwards and backwards.
The plane lens is made of SILICA glass material, the curvature radius of an object plane is infinite, the mirror distance is 0.4000mm, the mirror radius is 1.2524mm, the curvature radius of an image plane is infinite, the plane lens is glued with the plane of the first negative lens, and the lens radius of the plane lens is 1.6mm;
the first negative lens is made of H-ZLAF52 glass material, the plane curvature radius is infinite, the mirror distance is 0.3000mm, the mirror radius is 1.1064mm, the concave curvature radius of the first negative lens is 0.672mm, the mirror distance is 1.2920mm, the mirror radius is 0.5526mm, and the lens radius is 1.25mm;
the second negative lens is made of H-ZF1 glass material, the curvature radius of the convex surface is 16.58mm, the mirror surface distance is 0.2000mm, the mirror surface radius is 0.2208mm, the curvature radius of the concave surface is 1.52mm, and the second negative lens is glued with the convex surface of the object side of the second positive lens;
the second positive lens is made of H-LAK3 glass material, the curvature radius of the convex surface of the object side is 1.52mm, the mirror surface distance is 0.65mm, the mirror surface radius is 0.2955mm, the curvature radius of an image Fang Tumian of the second positive lens is-1.27 mm, the mirror surface distance is 0.6200mm, the mirror surface radius is 0.5218mm, and the lens radii of the second negative lens and the second positive lens are both 0.7mm;
the first positive lens is made of H-ZK3 glass material, the curvature radius of the convex surface of the object side is 6.15mm, the mirror surface distance is 0.8100mm, the mirror surface radius is 0.9000mm, the curvature radius of the image Fang Tumian is-2.48 mm, the mirror surface distance is 0.2150mm, the mirror surface radius is 0.9823mm, and the lens radius is 1.25mm;
the third positive lens is made of H-ZF1 glass material, the curvature radius of the convex surface of the object side is 3.95mm, the mirror surface distance is 1.1200mm, the mirror surface radius is 0.9913mm, the curvature radius of the convex surface of the image side is-1.98 mm, and the third positive lens is glued with the concave surface of the third negative lens;
the third negative lens is made of H-ZF72A glass material, the curvature radius of the concave surface is-1.98 mm, the mirror distance is 0.2400mm, the mirror radius is 0.9500mm, the curvature radius of the convex surface is-14.32 mm, the mirror distance is 0.16mm, the mirror radius is 0.9755mm, and the lens radii of the third positive lens and the third negative lens are 1.25mm.
The first cemented lens forms a negative group, the second cemented lens forms a focusing group, the first positive lens and the third cemented lens form a positive group, the focusing group can move along the optical axis under the pulling force of the traction steel wire, and after the pulling force is released, the focusing group is restored to the original position under the action of a spring, so that the state adjustment of conventional imaging-close-range enlarged imaging-conventional imaging is realized.
In general, the endoscope objective lens may include an infrared cut-off sheet, which is used to filter out near infrared light in the illumination light source, or may not directly transmit the light to the photosensitive surface through the protection window of the CMOS or CCD image sensor.
When applied to endoscopic imaging, the objective lens of the invention can realize two imaging modes: firstly, conventional imaging is carried out, an object distance is focused by an objective lens, an adjusting cylinder is arranged at the leftmost direction, and the adjusting cylinder is propped against a first cemented lens; and secondly, optical amplification imaging is carried out, an object distance is focused by an objective lens, and the adjusting cylinder is shifted rightwards by 0.2mm under the tension of a traction steel wire. Under the two states of conventional imaging and amplified imaging, the modulation degree of the endoscope objective lens in the full field of view range is almost different from the diffraction limit (DIFFRACTION LIMIT), and the maximum imaging field of view is 2 times of the full field of view and exceeds 145 degrees, so that the endoscope objective lens has the imaging advantages of large field of view and high resolution.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an optical transfer function of the present invention in a conventional imaging mode (10 mm object distance).
Fig. 3 is an optical transfer function of the present invention in an enlarged imaging mode (2 mm object distance).
Detailed Description
The invention is further described below with reference to the drawings.
As shown in fig. 1, an endoscope objective lens with an optical amplifying function of the present invention includes three lens groups, a negative group 101, a focusing group 102 and a positive group 103 in this order from an object side to an image side in a lens barrel 1. The focusing group 102 can move along the optical axis under the tension of the traction steel wire 13, and after the tension is released, the focusing group 102 is restored to the original position under the action of the spring 9, so that the state adjustment of conventional imaging, close-range enlarged imaging and conventional imaging is realized. The negative group 101 is composed of a first cemented lens 2, and comprises a plane lens 21 and a first negative lens 22, wherein both surfaces of the plane lens 21 are plane surfaces, the first negative lens 22 faces the object side to be plane surfaces, and faces the image side to be concave surfaces; the focusing group 102 is composed of a second cemented lens 4 and comprises a second negative lens 41 and a second positive lens 42, wherein the second negative lens 41 is convex towards the object side and concave towards the image side, and both surfaces of the second positive lens 42 are convex; the positive group 103 consists of a first positive lens 6 and a third cemented lens 8, and both surfaces of the first positive lens 6 are convex surfaces; the third cemented lens 8 includes a third positive lens 81 and a third negative lens 82, both surfaces of the third positive lens 81 are convex, the third negative lens 82 is concave facing the object side and convex facing the image side; the adjusting cylinder 5 simultaneously plays a role of an aperture diaphragm, and ensures that the size of the aperture diaphragm of the system is unchanged when the system moves forwards and backwards. In general, the endoscope objective may include an infrared cut-off sheet 10, which is used to filter out near infrared light from the illumination source, or may not directly image the photosensitive surface through a protection window 12 of a CMOS or CCD image sensor.
In this example, the endoscope objective lens having the optical magnification function has a total of 13 mirrors, which are defined as: the object plane of the plane lens 21 is a 1 st mirror surface, and the bonding surface of the plane lens 21 and the first negative lens 22 is a 2 nd mirror surface; the concave surface of the first negative lens 22 is a 3 rd mirror surface, the convex surface of the second negative lens 41 is a 4 th mirror surface, the bonding surface of the second negative lens 41 and the second positive lens 42 is a 5 th mirror surface, the image side convex surface of the second positive lens 42 is a 6 th mirror surface, the object side convex surface of the first positive lens 6 is a 7 th mirror surface, the image side convex surface of the first positive lens 6 is an 8 th mirror surface, the object side convex surface of the third positive lens 81 is a 9 th mirror surface, the bonding surface of the third positive lens 81 and the third negative lens 82 is a 10 th mirror surface, the convex surface of the third negative lens 82 is an 11 th mirror surface, the object side plane of the infrared cut-off sheet 10 is a 12 th mirror surface, and the image side plane of the infrared cut-off sheet 10 is a 13 th mirror surface. The structural parameters of 13 mirrors are shown in Table 1:
TABLE 1
When applied to endoscopic imaging, the objective lens of the invention can realize two imaging modes: firstly, conventional imaging is carried out, an object lens focuses on an object distance of 10mm, the adjusting cylinder 5 is arranged at the leftmost direction, and the adjusting cylinder 5 is propped against the first cemented lens 2; and secondly, optical amplification imaging is carried out, an object distance is focused by an objective lens, and the adjusting cylinder 5 is shifted to the right by 0.2mm under the tension of a traction steel wire.
Fig. 2 and 3 illustrate the photoimaging performance of the present invention.
Fig. 2 calculates the optical transfer function values of five FIELDs of view at 0 ° (AXIS), 15.05 ° (0.3 FIELD), 30.55 ° (0.6 FIELD), 46.95 ° (0.8 FIELD) and 60.95 ° (1.0 FIELD) in normalized coordinates at an object distance of 10 mm. As can be seen from FIG. 2, the spatial frequency values of all the fields of view can reach more than 150 lp/mm when the modulation degree is 0.26. Fig. 3 calculates the optical transfer function values of five FIELDs of view, 0 ° (AXIS), 16.53 ° (0.3 FIELD), 33.82 ° (0.6 FIELD), 53.09 ° (0.8 FIELD) and 72.85 ° (1.0 FIELD) in the normalized coordinates at the time of the 2mm objective lens. As can be seen from FIG. 3, the spatial frequency values of all the fields of view can reach more than 150 lp/mm when the modulation degree is 0.26.
Fig. 2 and 3 show that the endoscope objective lens with the optical amplifying function has a modulation degree which is slightly different from the diffraction limit (DIFFRACTION LIMIT) in the whole field of view, and the maximum imaging field of view is 2 times of the whole field of view and exceeds 145 degrees, so that the endoscope objective lens has the imaging advantages of large field of view and high resolution.
Claims (2)
1. An endoscope objective lens with an optical amplifying function, which is characterized in that: the lens comprises a lens cone (1), wherein a first cemented lens (2), a first space ring (3), a first positive lens (6), a second space ring (11) and a third cemented lens (8) are sequentially attached from the object side to the image side in the lens cone (1), an adjusting cylinder (5) and a spring (9) are assembled in the first space ring (3), a second cemented lens (4) is arranged in the adjusting cylinder (5), a pin (7) is respectively fixed on the upper part and the lower part of the adjusting cylinder (5), the pin (7) penetrates through the first space ring (3) and the lens cone (1) to be connected with a traction steel wire (13), and the adjusting cylinder (5) can be pulled to move towards the image side along the optical axis through the traction steel wire (13); the first cemented lens (2) consists of a plane lens (21) and a first negative lens (22) from the object space to the image space, wherein two planes of the plane lens (21) are planes, the first negative lens (22) faces the object space to be a plane, and faces the image space to be a concave surface; the second cemented lens (4) is composed of a second negative lens (41) and a second positive lens (42), the second negative lens (41) is convex towards the object side, concave towards the image side, and both surfaces of the second positive lens (42) are convex; both surfaces of the first positive lens (6) are convex surfaces; the third cemented lens (8) consists of a third positive lens (81) and a third negative lens (82), wherein both surfaces of the third positive lens (81) are convex surfaces, and the third negative lens (82) is concave and convex towards the object side; the adjusting cylinder (5) simultaneously plays a role of an aperture diaphragm, and ensures that the size of the aperture diaphragm of the endoscope objective lens is unchanged when the adjusting cylinder moves forwards and backwards;
the plane lens (21) is made of SILICA glass material, the radius of curvature of an object plane is infinite, the mirror distance is 0.4000mm, the radius of mirror is 1.2524mm, the radius of curvature of an image plane is infinite, the plane lens is glued with the plane of the first negative lens (22), and the radius of the plane lens (21) is 1.6mm;
the first negative lens (22) is made of H-ZLAF52 glass material, the plane curvature radius is infinite, the mirror distance is 0.3000mm, the mirror radius is 1.1064mm, the concave curvature radius of the first negative lens (22) is 0.672mm, the mirror distance is 1.2920mm, the mirror radius is 0.5526mm, and the lens radius is 1.25mm;
the second negative lens (41) is made of H-ZF1 glass material, the convex surface curvature radius is 16.58mm, the mirror surface distance is 0.2000mm, the mirror surface radius is 0.2208mm, the concave surface curvature radius is 1.52mm, and the second negative lens is glued with the object side convex surface of the second positive lens (42);
the second positive lens (42) is made of H-LAK3 glass material, the curvature radius of the convex surface of the object side is 1.52mm, the mirror surface distance is 0.65mm, the mirror surface radius is 0.2955mm, the curvature radius of an image Fang Tumian of the second positive lens (42) is-1.27 mm, the mirror surface distance is 0.6200mm, the mirror surface radius is 0.5218mm, and the lens radii of the second negative lens (41) and the second positive lens (42) are both 0.7mm;
the first positive lens (6) is made of H-ZK3 glass material, the curvature radius of the convex surface of the object side is 6.15mm, the mirror surface distance is 0.8100mm, the mirror surface radius is 0.9000mm, the curvature radius of the image Fang Tumian is-2.48 mm, the mirror surface distance is 0.2150mm, the mirror surface radius is 0.9823mm, and the lens radius is 1.25mm;
the third positive lens (81) is made of H-ZF1 glass material, the curvature radius of the convex surface of the object side is 3.95mm, the mirror surface distance is 1.1200mm, the mirror surface radius is 0.9913mm, the curvature radius of the convex surface of the image side is-1.98 mm, and the third positive lens is glued with the concave surface of the third negative lens (82);
the third negative lens (82) is made of H-ZF72A glass material, the concave surface curvature radius is-1.98 mm, the mirror surface distance is 0.2400mm, the mirror surface radius is 0.9500mm, the convex surface curvature radius is-14.32 mm, the mirror surface distance is 0.16mm, the mirror surface radius is 0.9755mm, and the lens radii of the third positive lens (81) and the third negative lens (82) are 1.25mm.
2. The endoscope objective lens with an optical magnification function according to claim 1, wherein: the endoscope objective lens also comprises an infrared cut-off sheet (10) which is clung to the image side of the third cemented lens (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810534537.4A CN108761766B (en) | 2018-05-29 | 2018-05-29 | Endoscope objective lens with optical amplification function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810534537.4A CN108761766B (en) | 2018-05-29 | 2018-05-29 | Endoscope objective lens with optical amplification function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108761766A CN108761766A (en) | 2018-11-06 |
| CN108761766B true CN108761766B (en) | 2023-08-04 |
Family
ID=64003701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810534537.4A Active CN108761766B (en) | 2018-05-29 | 2018-05-29 | Endoscope objective lens with optical amplification function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108761766B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109984718B (en) * | 2019-02-25 | 2021-03-23 | 浙江大学 | Endoscope objective with ultra-large field of view |
| CN111528771B (en) * | 2020-03-27 | 2022-02-18 | 浙江大学 | Electronic endoscope imaging objective lens zooming adjusting mechanism |
| CN116430574B (en) * | 2023-06-12 | 2023-08-29 | 之江实验室 | CMOS (complementary metal oxide semiconductor) installation and adjustment device and method for lens image sensor |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269450A (en) * | 1996-03-29 | 1997-10-14 | Olympus Optical Co Ltd | Objective lens for endoscope |
| JP2000162514A (en) * | 1998-11-30 | 2000-06-16 | Fuji Photo Optical Co Ltd | Objective lens for endoscope |
| JP2004020972A (en) * | 2002-06-18 | 2004-01-22 | Olympus Corp | Photo-optical system and endoscope using the same |
| JP2008107391A (en) * | 2006-10-23 | 2008-05-08 | Olympus Medical Systems Corp | Object optical system for endoscope |
| JP2011145315A (en) * | 2010-01-12 | 2011-07-28 | Fujifilm Corp | Imaging lens, imaging optical system and imaging apparatus |
| CN202305973U (en) * | 2011-10-18 | 2012-07-04 | 杭州首天光电技术有限公司 | Wide-angle object lens of electronic endoscope |
| WO2012176667A1 (en) * | 2011-06-23 | 2012-12-27 | オリンパスメディカルシステムズ株式会社 | Endoscope objective optical system |
| CN104471460A (en) * | 2012-07-23 | 2015-03-25 | 富士胶片株式会社 | Endoscope objective lens and endoscope |
| CN107615129A (en) * | 2016-02-23 | 2018-01-19 | Hoya株式会社 | Endoscope and the variable Diopter degree optical system for the endoscope |
| CN208384225U (en) * | 2018-05-29 | 2019-01-15 | 浙江大学 | A kind of endoscope lens having optical amplifier function |
-
2018
- 2018-05-29 CN CN201810534537.4A patent/CN108761766B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269450A (en) * | 1996-03-29 | 1997-10-14 | Olympus Optical Co Ltd | Objective lens for endoscope |
| JP2000162514A (en) * | 1998-11-30 | 2000-06-16 | Fuji Photo Optical Co Ltd | Objective lens for endoscope |
| JP2004020972A (en) * | 2002-06-18 | 2004-01-22 | Olympus Corp | Photo-optical system and endoscope using the same |
| JP2008107391A (en) * | 2006-10-23 | 2008-05-08 | Olympus Medical Systems Corp | Object optical system for endoscope |
| JP2011145315A (en) * | 2010-01-12 | 2011-07-28 | Fujifilm Corp | Imaging lens, imaging optical system and imaging apparatus |
| WO2012176667A1 (en) * | 2011-06-23 | 2012-12-27 | オリンパスメディカルシステムズ株式会社 | Endoscope objective optical system |
| CN202305973U (en) * | 2011-10-18 | 2012-07-04 | 杭州首天光电技术有限公司 | Wide-angle object lens of electronic endoscope |
| CN104471460A (en) * | 2012-07-23 | 2015-03-25 | 富士胶片株式会社 | Endoscope objective lens and endoscope |
| CN107615129A (en) * | 2016-02-23 | 2018-01-19 | Hoya株式会社 | Endoscope and the variable Diopter degree optical system for the endoscope |
| CN208384225U (en) * | 2018-05-29 | 2019-01-15 | 浙江大学 | A kind of endoscope lens having optical amplifier function |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108761766A (en) | 2018-11-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108761766B (en) | Endoscope objective lens with optical amplification function | |
| US7746566B2 (en) | Observation optical system | |
| CN106062609B (en) | Objective lens optical system | |
| US10295791B2 (en) | Optical image capturing system | |
| WO2012169369A1 (en) | Optical unit and endoscope | |
| US20180059367A1 (en) | Optical image capturing system | |
| CN102687053A (en) | Objective Optical System | |
| CN108474926B (en) | Objective optical system | |
| US10139603B2 (en) | Compact optical image capturing system | |
| CN102428401A (en) | Objective lens of endoscope | |
| JP2018141825A (en) | Image capturing lens | |
| CN109416459B (en) | Endoscope objective optical system | |
| JP7205537B2 (en) | Optical system for rigid endoscope, imaging device and endoscope system | |
| CN107430260B (en) | Objective optical system for strabismus and endoscope for strabismus having the same | |
| CN208384225U (en) | A kind of endoscope lens having optical amplifier function | |
| TW201400858A (en) | Zoom lens and zoom lens module | |
| JP6252192B2 (en) | Projection optical system and projection-type image display device | |
| CN210514787U (en) | Zoom objective lens for endoscope and endoscope | |
| JP2011505018A (en) | Dual focal length lens system | |
| CN112649951B (en) | Low-distortion wide-angle zoom lens | |
| TWI537595B (en) | Zoom lens | |
| JP6836466B2 (en) | Endoscopic objective optical system | |
| CN109984718B (en) | Endoscope objective with ultra-large field of view | |
| JP2003307672A (en) | Lens device | |
| JP2008257123A (en) | Observation optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |