EP3507639A1 - Système optique grand angle à focale variable - Google Patents
Système optique grand angle à focale variableInfo
- Publication number
- EP3507639A1 EP3507639A1 EP17771488.8A EP17771488A EP3507639A1 EP 3507639 A1 EP3507639 A1 EP 3507639A1 EP 17771488 A EP17771488 A EP 17771488A EP 3507639 A1 EP3507639 A1 EP 3507639A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical system
- lens
- lenses
- focal length
- group
- 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.)
- Withdrawn
Links
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- 230000015572 biosynthetic process Effects 0.000 claims abstract description 3
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- 101100428781 Human herpesvirus 6A (strain Uganda-1102) U8 gene Proteins 0.000 claims description 2
- 101100126953 Oryza sativa subsp. japonica KCS20 gene Proteins 0.000 claims description 2
- 101150043825 SFL1 gene Proteins 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000004075 alteration Effects 0.000 description 25
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 230000005499 meniscus Effects 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
-
- 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
- G02B15/142—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 having two groups only
-
- 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
- G02B15/142—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 having two groups only
- G02B15/1425—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 having two groups only the first group being negative
Definitions
- the present invention relates to electronic image forming systems having fisheye wide angle optical systems with variable focal length.
- the invention relates to a fisheye-type wide angle optical system with variable focal length capable of passing from a diagonal fisheye to a circular fisheye.
- Such an optical system is intended to be mounted on an electronic image forming system comprising an electronic image sensor, being associated with said sensor positioned in the image space of the optical system.
- “Fisheye wide-angle optical system” means that the optical system has a maximum field of view greater than 120 degrees in at least one general direction of the field of view of the optical system, and preferably a higher maximum field of view. at 160 degrees or even a maximum angle of field close to 180 degrees.
- Fisheye wide angle optical system with variable focal length is meant a change in the region of the image formed by the optical system on which the maximum angle of view is reached.
- such an optical system may be such that the field of view is fixed during the change of focal length.
- circular fisheye means a configuration in which the entire field of view, whose maximum angle is close to 180 degrees, is written in the electronic sensor. The entire field of view is thus imaged in a circle inscribed on the sensor.
- diagonal fisheye is meant a configuration in which the maximum angle of example close to 180 degrees, is obtained only in a few directions, especially on diagonals of the image sensor.
- Such an optical system is for example described in the document EP 2 407 809 A1 and usually comprises substantially aligned along an optical axis OI from an object space 0 to an image space I of the optical system: a first group of lenses A negative vergence , and
- a second group of positive-verging lenses B the first group of lenses A and the second group of lenses B moving relative to one another along the optical axis between a configuration of shorter focal length fw and a configuration of longer focal length ft.
- the configuration of shorter focal length then corresponds to a circular fisheye while the configuration of longer focal length corresponds to a diagonal fisheye.
- EP 2 407 809 A1 has several disadvantages.
- This system comprises a large number of lenses (14 lenses) made of a similarly large number of different materials (10 different materials). Many of these lenses have aspheric surfaces that are expensive to manufacture and that require demanding manufacturing and alignment tolerances.
- this optical system has a large vignetting which limits the optical performance of the system in terms of nonuniformity of the distribution of light intensity on the sensor causing a significant drop in this intensity as one moves away from the center of the image.
- the present invention is intended to overcome these disadvantages.
- an electronic image forming system comprising an optical system of the kind in question and a non - planar electronic image sensor, the optical system being specially adapted to be mounted on the training system.
- An electronic image comprising the non - planar electronic image sensor associated with said sensor positioned in the optical system image space is characterized by further satisfying the following condition:
- C is the radius of curvature of the image formed by the optical system and bfw is the distance between the end lens of the image space of the second lens group B and the object image formed by the optical system in the configuration of shorter focal length, and in that the non-planar electronic image sensor has a fixed radius of curvature, in particular fixed during a change in focal length of the optical system.
- the optical system satisfies the following condition:
- Fl is a focal length of the fixed lens group A
- F2 is a focal length of the second lens group B
- bfw is the distance between the end lens of the image space of the second lens group B and the image object formed by the optical system in the configuration of shorter focal length
- said second lens group B comprises, in order from an image space thereof, a positive lens and a negative lens, in particular a positive lens, a negative lens and a positive lens;
- said second group of lenses B comprises less than eight lenses, preferably less than seven lenses, even more preferably less than six lenses;
- the optical system satisfies the following condition:
- the optical system satisfies the following condition:
- the optical system satisfies the following condition:
- M2 is an axial displacement of the second lens group B between the shorter focal length configuration and the longer focal length configuration and F2 is a focal length of the second lens group B;
- said second group of lenses B comprises an alternating juxtaposition of positive and negative lenses, starting with a positive lens from the object space of said lens group;
- the non-planar electronic image sensor is convex.
- FIG. 1 diagrammatically illustrates a first exemplary embodiment of an optical system according to the invention in which the first lens group comprises five lenses and the second lens group of the optical system also comprises five lenses,
- FIG. 2A illustrates four aberration curves of the optical system of FIG. 1 at shorter focal length, respectively from left to right, spherical aberration for three wavelengths 0.4861 ⁇ m, 0.5876 ⁇ m and 0.6563 ⁇ m, the curvature from field to field wavelength 0.5876 ⁇ m, side chromaticism at wavelength 0.5876 ⁇ m and distortion at wavelength 0.5876 ⁇ m,
- FIG. 2B illustrates the aberration curves of FIG. 2A for an intermediate focal distance of the example of FIG. 1,
- FIG. 2C illustrates the aberration curves of FIG. 2A for the largest focal length of the example of FIG. 1,
- FIG. 3 schematically illustrates a second exemplary embodiment of an optical system according to the invention in which the first lens group comprises five lenses and the second lens group of the optical system comprises six lenses,
- FIG. 4A illustrates four aberration curves of the optical system of FIG. 3 at shorter focal length, respectively from left to right, spherical aberration for three wavelengths 0.4861 ⁇ m, 0.5876 ⁇ m and 0.6563 ⁇ m, the curvature field strength at wavelength 0.5876 ⁇ m, side chromaticism at wavelength 0.5876 ⁇ m and distortion at wavelength 0.5876 ⁇ m,
- FIG. 4B illustrates the aberration curves of FIG. 4A for an intermediate focal length of the example of FIG. 3,
- FIG. 4C illustrates the aberration curves of FIG. 4A for the greatest focal length of the example of FIG. 3,
- FIG. 5 schematically illustrates a third exemplary embodiment of an optical system according to the invention in which the first lens group comprises five lenses and the second lens group of the optical system comprises seven lenses,
- FIG. 6A illustrates four aberration curves of the optical system of FIG. 5 at shorter focal length, respectively from left to right, spherical aberration for three wavelengths 0.4861 ⁇ m, 0.5876 ⁇ m and 0.6563 ⁇ m, the curvature field strength at wavelength 0.5876 ⁇ m, side chromaticism at wavelength 0.5876 ⁇ m and distortion at wavelength 0.5876 ⁇ m,
- FIG. 6B illustrates the aberration curves of FIG. 6A for an intermediate focal length of the example of FIG. 5,
- FIG. 6C illustrates the aberration curves of FIG. 6A for the largest focal length of the example of FIG. 5,
- FIG. 7 schematically illustrates a fourth embodiment of an optical system according to the invention in which the first lens group comprises five lenses and the second lens group of the optical system comprises six lenses,
- FIG. 8A illustrates four aberration curves of the optical system of FIG. 7 at shorter focal length, respectively from left to right, spherical aberration for three wavelengths 0.4861 ⁇ m, 0.5876 ⁇ m and 0.6563 ⁇ m, the curvature of FIG. field at wavelength 0.5876 ⁇ m, side chromaticism at wavelength 0.5876 ⁇ m and distortion at wavelength 0.5876 ⁇ m,
- FIG. 8B illustrates the aberration curves of FIG. 8A for an intermediate focal length of the example of FIG. 7,
- FIG. 8C illustrates the aberration curves of FIG. 8A for the greatest focal length of the example of FIG. 7,
- FIG. 9 illustrates an angle between the optical axis and a main ray of an off-axis light beam arriving on the lens closest to the object space
- Fig. 10 is a schematic illustration of an electronic image forming system according to one embodiment of the invention.
- FIG. 1 illustrates a first embodiment of an optical system 1 integrated in an electronic image forming system 2 comprising a non-planar electronic image sensor 3 according to the invention.
- the optical system 1 extends with axial symmetry along an optical axis O from an object space to an image space of the optical system.
- the optical system comprises, in order from the object space, a first group of lenses A and a second group of lenses B.
- the first group of lenses A has a negative vergence.
- the second group of lenses B has a positive vergence.
- the first group of lenses A and the second group of lenses B move relative to each other along the optical axis during a change of focal length of the optical system.
- the first lens group A and the second group of lenses B move relative to each other between a configuration of shorter focal length and a configuration of longer focal length.
- the configuration of shorter focal length corresponds for example to a circular fisheye while the configuration of longer focal length corresponds to a diagonal fisheye.
- the region of the image formed by the optical system on which the maximum field angle is reached is thus varied between the shorter focal length configuration and the longer focal length configuration.
- the size of the image formed by the optical system is thus varied between the configuration of shorter focal length and the configuration of longer focal length.
- the optical system is such that
- f is a focal length such that fw ⁇ f ⁇ ft and Y is the image size of an incident ray with an angle ⁇ , where ⁇ is the angle, shown in Figure 9, between the optical axis (0) and a main ray (P) of an off-axis light beam arriving on the lens closest to the object space.
- This projection performed by the wide-angle optical system is called an equisolide angle projection.
- the optical system has a maximum near-field angle of 180 degrees with reduced distortion at the center of the image.
- the optical system can also satisfy the following condition: where Yt is a larger image size for the optical system in the longer focal length configuration and Yw is a larger image size for the optical system in the shorter focal length configuration.
- Condition (2) provides an optical system capable of passing from a configuration of shorter focal length corresponding to a circular fisheye to a configuration of longer focal length corresponding to a diagonal fisheye.
- condition (2) guarantees the obtaining of a circular fisheye and a diagonal fisheye for a variety of image sensor formats, in particular APS-H format image sensors (with dimensions of 28.1 mm x 18.7 mm and a diagonal of 33.8 mm), APS-C image sensors (with dimensions of 22.5 mm x 15.0 mm and a diagonal of 27.0 mm) and full-size image sensors -size "(with dimensions of 36 mm x 24 mm and a diagonal of 43.2 mm).
- APS-H format image sensors with dimensions of 28.1 mm x 18.7 mm and a diagonal of 33.8 mm
- APS-C image sensors with dimensions of 22.5 mm x 15.0 mm and a diagonal of 27.0 mm
- optical system is such that:
- C is a radius of curvature of the image formed by the optical system and bfw is a draw of the objective, that is to say a distance between, on the one hand, a last lens of the second group of lenses B disposed the image space of said second lens group, and secondly, an image formed by the optical system in the configuration of shorter focal length.
- the optical system can satisfy the following condition:
- the first lens group A When -y ⁇ j exceeds the upper limit of condition (4), the first lens group A has a short focal length and it becomes difficult to correct the field curvature and chromatic side aberrations.
- the system then has the disadvantages of prior systems discussed above, including greater manufacturing complexity and lower optical performance due to increased aberrations.
- the first lens group A has a long focal length, it is difficult to obtain a circular fisheye in the configuration of shorter focal length while maintaining a draw bfw sufficient to fit the electronic boxes current.
- the optical system can also satisfy the following condition:
- the lens A1 When SF1 exceeds the upper limit of the condition (5), the lens A1 has too strong a vergence and it becomes difficult to correct the aberration of curvature generated as the lateral chromatic aberration.
- the first lens of the object space of the first lens group A has a weak vergence and it is difficult to obtain a wide angle fisheye lens.
- the optical system can satisfy the following condition:
- M2 is an axial displacement of the second lens group B between the shorter focal length configuration and the longer focal length configuration and F2 is a focal length of the second lens group B.
- the optical system can also satisfy the following condition:
- the first lens group A When exceeds the upper limit of condition (7), the first lens group A has a very large focal length and it becomes difficult to achieve a circular fisheye.
- the first lens group A When - is below the lower limit of the condition (7), the first lens group A has a small focal length and it becomes difficult to correct the field curvature and chromatic side aberrations.
- the optical system may further satisfy the following condition:
- the first A group of lenses has a negative vergence while the second group of lenses B has a positive vergence.
- the first group of lenses A has five lenses referenced A1 to A5 from the object space to the image space of the optical system.
- the first group of lenses A comprises:
- a first lens A1 which is a negative meniscus with a convex surface towards the object space
- a second lens A2 which is also a negative meniscus
- a fourth lens A4 which is a positive lens
- a fifth lens A5 which is a negative lens.
- FIG. 1 A first embodiment of the invention is illustrated in FIG. 1
- the second group of lenses B of the optical system comprises five lenses referenced Bl-1 to B5-1 from the object space to the image space of the optical system.
- the second group of lenses B thus comprises, from the object space to the image space of the optical system:
- a first lens Bl-1 which is a positive lens
- a fifth lens B5-1 which is a positive lens.
- the second group of lenses B of the optical system comprises, in order from the image space, a positive lens, a negative lens and a positive lens.
- the second group of lenses B of the optical system thus does not include a field flattener, in particular formed by a succession of several positive lenses at the end of the image space of the optical system.
- the second group of lenses B comprises an alternating juxtaposition of positive and negative lenses, starting with a positive lens from the object space of said lens group.
- r is the radius of curvature in millimeters of each surface
- d is the distance in millimeters separating two successive surfaces
- nd is the refractive index of the material for the wavelength of the line.
- sodium d (587.56 nm)
- vd is the corresponding Abbe number.
- the second group of lenses B of the optical system comprises six lenses referenced Bl-2, B2-2, B3-2, B4-2, B5-2 and B6-2 from the object space to the image space of the optical system.
- the second group of lenses B thus comprises, from the object space to the image space of the optical system:
- a first lens Bl-2 which is a positive lens
- an optical doublet (B2-2, B3-2) formed of a lens B2-2 which is a negative lens and a third lens B3-2 which is a positive lens,
- an optical doublet (B4-2, B5-2) formed of a fourth lens B4-2 which is a positive lens, and a fifth lens B5-2 which is a negative lens,
- a sixth lens B6-2 which is a positive lens.
- the second group of lenses B of the optical system comprises, in order from the image space, a positive lens, a negative lens and a positive lens and thus does not include a field flattener.
- FIG. 1 A third embodiment of the invention is illustrated in FIG. 1
- the second group of lenses B of the optical system comprises seven lenses referenced Bl-3, B2-3, B3-3, B4-3, B5-3, B6-3 and B7-3 from the object space to the image space of the optical system.
- the second group of lenses B thus comprises, from the object space to the image space of the optical system:
- a first lens Bl-3 which is a positive lens
- a first optical doublet (B2-3, B3-3) formed of a second lens B2 which is a negative lens and a third lens B3-3 which is a positive lens,
- a second optical doublet (B4-3, B5-3) formed of a fourth lens B4 which is a positive lens, and a fifth lens B5 which is a negative lens, and a third optical doublet formed of a sixth lens additional B6-3 which is a negative lens and a seventh lens B7-3 which is a positive lens.
- the second group of lenses B of the optical system comprises, in order from the image space, a positive lens, a negative lens and a negative lens and thus does not include a field flattener.
- the second group of lenses B of the optical system comprises six lenses referenced Bl-4, B2-4, B3-4, B4-4, B5-4 and B6-4 from the object space to the image space of the optical system.
- the second group of lenses B thus comprises, from the object space to the image space of the optical system:
- a first lens Bl-4 which is a positive lens
- an optical doublet (B2-4, B3-4) formed of a lens B2-4 which is a negative lens and a third lens B3-4 which is a positive lens,
- an optical doublet (B4-4, B5-4) formed of a fourth lens B4-4 which is a positive lens, and a fifth lens B5-4 which is a negative lens,
- a sixth lens B6-4 which is a positive lens.
- the second group of lenses B of the optical system comprises, in order from the image space, a positive lens, a negative lens and a positive lens and thus does not include a field flattener.
- SOI is the first embodiment
- SO2 is the second embodiment
- SO3 is the third embodiment
- SO4 is the fourth embodiment.
- FIG. 10 illustrates the integration of an optical system 1 in an electronic image forming system 2 comprising a non-planar electronic image sensor 3 according to the invention.
- the non-planar electronic image sensor 3 is placed in the image space of the optical system 1 at the location of the image formed by said optical system.
- the image sensor 3 comprises a photo element transducer array and forms a CCD sensor or a CMOS sensor for example.
- the image sensor 3 is not flat and therefore has a non-infinite radius of curvature.
- the image sensor may be a sensor of variable radius of curvature or, advantageously, perhaps an image sensor with a fixed radius of curvature, so as to simplify the operation of the electronic image forming system.
- the image sensor 3 has a fixed radius of curvature, in particular fixed during a change in the focal length of the optical system 1.
- a fixed curvature has certain advantages, especially with respect to a variable or adjustable curvature:
- variable curvature necessitates a deformation mechanism of the additional image sensor, which is heavy, bulky and subject to the fatigue of the materials;
- variable curvature can lead to additional fragilities of the image sensor which can degrade the quality of the image in the long run;
- a flat image sensor can easily be replaced by a non-planar image sensor with a fixed radius of curvature in an electronic box. Conversely, the replacement of a planar image sensor by an image sensor with a variable radius of curvature necessitates major modifications of the case, which implies a different design or production line in order to realize the system of production. image formation.
- the image sensor 3 is advantageously convex. This is notably different from the majority of electronic image forming systems which have a sensor having a concave radius of curvature.
- the radius of curvature of the image sensor may for example be between 161 and 280 mm, or even between 161 and 262 mm.
- the electronic image forming system 2 may be a digital SLR camera.
- the optical system 1 can be integrated and mounted on a camera body 4 comprising the image sensor 3.
- the lens can in particular be removably mounted on the camera body 4.
- the apparatus body 4 may furthermore comprise a removable mirror 5 adapted, in a first position, to be placed on the optical axis to reflect the light coming from the optical system 1 in the direction of a viewing optical system 6 comprising a ocular 7 and, in a second position, deviate from the optical axis of the optical system 1 to let light from the optical system 1 reach the image sensor 3 disposed in the camera body 4.
- a removable mirror 5 adapted, in a first position, to be placed on the optical axis to reflect the light coming from the optical system 1 in the direction of a viewing optical system 6 comprising a ocular 7 and, in a second position, deviate from the optical axis of the optical system 1 to let light from the optical system 1 reach the image sensor 3 disposed in the camera body 4.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1658104A FR3055428B1 (fr) | 2016-09-01 | 2016-09-01 | Objectif de zoom grand champ a detecteur courbe |
PCT/FR2017/052310 WO2018042129A1 (fr) | 2016-09-01 | 2017-08-30 | Système optique grand angle à focale variable |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3507639A1 true EP3507639A1 (fr) | 2019-07-10 |
Family
ID=57680359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17771488.8A Withdrawn EP3507639A1 (fr) | 2016-09-01 | 2017-08-30 | Système optique grand angle à focale variable |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3507639A1 (fr) |
FR (1) | FR3055428B1 (fr) |
WO (1) | WO2018042129A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110673313B (zh) * | 2019-09-27 | 2021-09-14 | 上海电机学院 | 一种变焦鱼眼镜头系统及设计方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5745303A (en) * | 1994-06-14 | 1998-04-28 | Fuji Photo Optical Co., Ltd. | Zoom lens system |
JP5506577B2 (ja) * | 2010-07-14 | 2014-05-28 | キヤノン株式会社 | 光学系および光学機器 |
-
2016
- 2016-09-01 FR FR1658104A patent/FR3055428B1/fr not_active Expired - Fee Related
-
2017
- 2017-08-30 EP EP17771488.8A patent/EP3507639A1/fr not_active Withdrawn
- 2017-08-30 WO PCT/FR2017/052310 patent/WO2018042129A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3055428B1 (fr) | 2018-09-14 |
FR3055428A1 (fr) | 2018-03-02 |
WO2018042129A1 (fr) | 2018-03-08 |
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