CN108254859A - Catadioptric optical system and photographic device - Google Patents
Catadioptric optical system and photographic device Download PDFInfo
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- CN108254859A CN108254859A CN201711216036.3A CN201711216036A CN108254859A CN 108254859 A CN108254859 A CN 108254859A CN 201711216036 A CN201711216036 A CN 201711216036A CN 108254859 A CN108254859 A CN 108254859A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0804—Catadioptric systems using two curved mirrors
- G02B17/0808—Catadioptric systems using two curved mirrors on-axis systems with at least one of the mirrors having a central aperture
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0856—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors
- G02B17/086—Catadioptric systems comprising a refractive element with a reflective surface, the reflection taking place inside the element, e.g. Mangin mirrors wherein the system is made of a single block of optical material, e.g. solid catadioptric systems
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Abstract
The present invention provides a kind of catadioptric optical system and photographic device.Slim catadioptric optical system with defined imaging performance, bright and with smaller low back of the body coefficient long-focus is provided.A kind of catadioptric optical system and the photographic device for having the catadioptric optical system, the catadioptric optical system is coaxial catadioptric optical system twice, with the first lens and the second lens being configured in a manner of setting airspace from object side, first refractive face is formed in the neighboring area in the face of the object side of the first lens, the second reflecting surface is formed in the central area in the face of the object side of the first lens, the first reflecting surface is formed in the neighboring area in the face into image side of the second lens, the second plane of refraction is formed in the central area in the face into image side of the second lens, meet the rated condition related with the effective diameter of the first reflecting surface and the second reflecting surface.
Description
Technical field
The present invention relates to a kind of catadioptric optical system and photographic devices, are related to a kind of become clear and in optical axis in more detail
Photographic device thin and that mobile phone, movable equipment, robot, vehicle-mounted equipment etc. can be appropriately mounted on direction
Slim catadioptric optical system and the photographic device for being equipped with the catadioptric optical system.
Background technology
In the past, in order to reduce the camera system of mobile phone from its general amount of thickness protrusion etc., in various equipment
It is expected in field in the direction of the optical axis it is thin, i.e. represent until the first face to image space of object side of lens on optical axis
Distance " lens overall length " short slim catadioptric optical system.
As previous slim catadioptric optical system, as shown in figure 14, it is proposed that a kind of following optical system, the light
System is a piece of lens arrangement, and the first imaging lens system 11 has the face for the object side for including the first central part 21 and peripheral portion 22
The 11a and face 11b into image side including the second central part 23 and peripheral portion 24 makes to 22 incidence of the first peripheral part from object
To inside inner surface reflection occurs at the second peripheral part 24 for the light transmission of body, then table in occurring at the first central part 21
Face is reflected, and is projected through the second central part 23 to outside.15 represent seal glass (seal glass), and 14a represents light receiving surface.
(for example, referring to patent document 1)
As previous other slim catadioptric optical systems, as shown in figure 15, it is proposed that a kind of following optical system,
The optical system is two panels lens arrangement, successively first lens L1 of the configuration with just (+) refracting power and with negative (-) refracting power
The second lens L2, the object sides of the first lens included the second reflecting surface S3 formed centered on optical axis and is formed in second
The first transmission plane S1 on reflecting surface S3 peripheries, the first lens include the second transmission plane S4 formed centered on optical axis into image side
With the first reflecting surface S2 for being formed in the second transmission plane S4 peripheries, the first transmission plane S1 is concave curved surface, and is hung down with optical axis
Straight face.5 represent imaging sensor.(for example, referring to patent document 2)
As the coefficient for the optical property for representing slim catadioptric optical system, the low back of the body (low shown below is used
Profile) coefficient.
The low back of the body imaging circular diameter of coefficient=lens overall length/effectively (twice of maximum image height)
Here, lens overall length refers to the distance from the first face of object side to image space.
The low back of the body coefficient and focal length of each embodiment of patent document 1 and 2 are as follows.
It in small-sized digital camera, is built in the camera function of mobile phone, there is the picture electronics that will be taken
The function of being referred to as digital zoom of amplification.The digital zoom lens are may not necessarily to make component object as optical zoom lens
It manages mobile function, but if excessively enlarged drawing, leads to image quality decrease.Due to the decline of the picture quality, lead to
There is limitation in the range that crossing digital zoom can amplify.
On the other hand, real situation is that the optical zoom lens with desired zoom ratio are formed as desired lens
Overall length is extremely difficult.Therefore, it actually uses and two or more digital zoom camera systems is combined and can seem one
" the simulation zoom lens " that a optical zoom lens use like that, and can not be taken the photograph by an optical lens system to change
As the so-called zoom lens of multiplying power.That is, in the simulation zoom lens, by the imaging of the single focal lense with short focus
The imaging optical system of system and the wide-angle imaging system of the first photographing element and the single focal lense with long-focus and the
The camera system combination of dolly-out,ing dolly-back of two photographing elements.
It acts to support shorter zoom focal area using wide-angle imaging system and by its digital zoom.Using dolly-out,ing dolly-back
Camera system simultaneously acts to support longer zoom focal area by its digital zoom.Moreover, by making two digital zooms
Focal area continuously links, be thus configured to seem a zoom lens camera system.
Patent document 1：Japanese Unexamined Patent Publication 2004-85725 bulletins
Patent document 2：Japanese Unexamined Patent Publication 2016-114939 bulletins
Invention content
Problems to be solved by the invention
In the past, the function and effect about the imaging optical system of long-focus, lens of dolly-out,ing dolly-back, it is impossible to which fully reply is formed
Bright and with smaller low back of the body coefficient slim catadioptric optical system is such to be required.In addition, for slim catadioptric
Optical system is penetrated, due to the limitation of its " slim ", the focal length that can industrially realize like that as shown above is limited.
Also, other than seeking generally to require as longer focal length to lens of dolly-out,ing dolly-back, in the technology of the simulation zoom lens
In field, based on it is following the reasons why also seek to a kind of focal length longer than the prior art and slim catadioptric optical system.
About current manufacture and in the simulation zoom lens sold, for example, the image optics of the single focal lense of short focus
The focal length of system is 28mm (35mm films equivalence value), and the focal length of the imaging optical system of the single focal lense of long-focus is 50mm
(35mm films equivalence value).On the other hand, the model that digital zoom can be received in performances such as the clarity of image by demander
Enclose the digital zoom multiplying power that interior acquisition is amplified to 5 times.Thus, in the example illustrated, the imaging of the single focal lense of short focus
System can carry out digital zoom in the range of focal length is 28mm~140mm (35mm films equivalence value).On the other hand, it closes
In the imaging optical system of the single focal lense of long-focus, focal length is 50mm (35mm films equivalence value), can 50mm~
Digital zoom is carried out in the range of 250mm (35mm films equivalence value).In such simulation zoom lens, in two numbers
In word zoom area, 50mm~140mm overlaps, so as to which there are parts useless on optical texture.
On the other hand, it is such as lower structure and similar to the optical system of simulation zoom in documents 1：By catadioptric
It is side camera system of dolly-out,ing dolly-back that the lens of optical system, which use, and the common lens system not comprising reflecting surface is adopted as wide-angle side
Imaging lens system keeps the two camera-lens systems by the lens maintaining part that can be rotated, and comes selectively saturating using camera shooting
Mirror.But the equivalent focal length of the side camera system of dolly-out,ing dolly-back of catadioptric optical system provided in documents 1 is used to grow to
The degree of 210mm, the range of digital zoom can be carried out by having exceeded wide-angle side camera system, thus can not be with good image matter
It measures these dolly-out, dolly-back side camera system and the combinations of wide-angle side camera system.In addition, since low back of the body coefficient is greatly to 1.77 or so, because
This is used in smaller picture dimension to be contained in thin basket, so as to be difficult to acquire good picture quality and easily observation
Size image.
(purpose of invention)
The present invention be in view of the above problem of the prior art and complete, its purpose is to provide one kind have it is defined into
As the catadioptric optical system of performance, bright and with smaller low back of the body coefficient long-focus.
The solution to the problem
In order to solve described problem, the application the first invention is a kind of catadioptric optical system, including the first lens and
Two lens, second lens are configured in a manner of setting airspace between first lens and are leaned on than first lens
Into at the position of image side,
The neighboring area in the face of the object side of first lens is first refractive face, in the shot of first lens
The central area in the face on side forms the second reflecting surface,
The central area in the face into image side of second lens is the second plane of refraction, in second lens into image side
Face neighboring area formed the first reflecting surface,
The catadioptric optical system meets following conditional (1).
Hm2/Hm1≤0.65···········(1)
Wherein,
Hm2 is the effective diameter of second reflecting surface,
Hm1 is the effective diameter of first reflecting surface.
Second invention is a kind of photographic device, is had：The catadioptric optical system of the first invention；And photographing element,
Configuration is at the image space of the catadioptric optical system.
The effect of invention
According to the catadioptric optical system of the first invention, can form with defined imaging performance, it is bright and with compared with
The catadioptric optical system of the long-focus of small low back of the body coefficient.
According to the photographic device of the second invention, it can form and have long-focus bright and with smaller low back of the body coefficient
Catadioptric optical system, small-sized and slim photographic device that imaging performance is outstanding.
Description of the drawings
Fig. 1 is the optical cross section figure of the first embodiment of the catadioptric optical system of the first invention.
Fig. 2 is the spherical aberration diagram of the first embodiment of the catadioptric optical system of the first invention.
Fig. 3 is the optical cross section figure of the second embodiment of the catadioptric optical system of the first invention.
Fig. 4 is the spherical aberration diagram of the second embodiment of the catadioptric optical system of the first invention.
Fig. 5 is the optical cross section figure of the 3rd embodiment of the catadioptric optical system of the first invention.
Fig. 6 is the spherical aberration diagram of the 3rd embodiment of the catadioptric optical system of the first invention.
Fig. 7 is the optical cross section figure of the fourth embodiment of the catadioptric optical system of the first invention.
Fig. 8 is the spherical aberration diagram of the fourth embodiment of the catadioptric optical system of the first invention.
Fig. 9 is the optical cross section figure of the 5th embodiment of the catadioptric optical system of the first invention.
Figure 10 is the spherical aberration diagram of the 5th embodiment of the catadioptric optical system of the first invention.
Figure 11 is the structure chart of the first embodiment of the photographic device of the second invention.
Figure 12 is the structure chart of the second embodiment of the photographic device of the second invention.
Figure 13 is the stereogram of the mobile phone of the second embodiment for the photographic device for being equipped with the second invention.
Figure 14 is the optical cross section figure of the photographic lens shown in patent document 1.
Figure 15 is the optical cross section figure of the optical system shown in patent document 2.
Reference sign
L1：First lens；L2：Second lens；C：Anti- ghost image V slots；B：Anti- ghost image plate；R1~R10：Plane of refraction；M1：First
Reflecting surface；M2：Second reflecting surface；H1：First shell；H2：Second housing；100：First catadioptric optical system；200：Second
Dioptric system.
Specific embodiment
Hereinafter, illustrate the catadioptric optical system of the present invention and have the photographic device of the catadioptric optical system.
The catadioptric optical system of the first invention includes the first lens and the second lens, and second lens are with described first
The mode of airspace is set to be configured at than first lens by the position into image side between lens,
The neighboring area in the face of the object side of first lens is first refractive face, in the shot of first lens
The central area in the face on side forms the second reflecting surface,
The central area in the face into image side of second lens is the second plane of refraction, in second lens into image side
Face neighboring area formed the first reflecting surface,
The catadioptric optical system meets following conditional (1).
Hm2/Hm1≤0.65···········(1)
Wherein,
Hm2 is the effective diameter of second reflecting surface,
Hm1 is the effective diameter of first reflecting surface.
Here, the immediate vicinity of lens face when central area refers to centered on the optical axis of lens, neighboring area refer to
Region in lens face in addition to central area and near the periphery of lens face.In addition, later also by the quilt in each lens
It takes the photograph the central area in the face on side and is known as the central part of lens into the part clamped by the central area in the face of image side, also will
The neighboring area in the face of the object side in each lens and it is known as lens into the part clamped by the neighboring area in the face of image side
Peripheral portion.
The catadioptric optical system of the first invention is the lens system for being formed as one multiple planes of refraction and reflecting surface, will
Each face forming lapping be processed as it is coaxial, easily keep maintain the forming lapping face coaxial state assembled, so as to
Obtain high machining accuracy and assembly precision.
In addition, by the way that the first lens and the are configured in a manner of setting airspace between the first lens and the second lens
Two lens can set 5 planes of refraction and reflectings surface or the folding of 5 or more between first refractive face and the first reflecting surface
Penetrate face and reflecting surface.As a result, it is possible to ensure multiple aberration correction elements, spherical aberration and broom particularly can be easily corrected
Star image is poor, so as to obtain high resolution ratio.In addition, by setting airspace, light can be reduced in plane of refraction and sky
The height and position relative to optical axis of the boundary transmission at gas interval, so as to be preferred in terms of the second reflecting surface path is made
's.
In addition it is also possible between object side, the first lens and the second lens in the first lens or the second lens
It is imaged surface side configuration and has refractive lens, optical filter etc..
Also, at least one party in the first lens and the second lens of the catadioptric optical system of the first invention can be double
Balsaming lens.
Conditional (1) is for the conditional of regulation lens shading rate.Here, lens shading rate is for a lens face
It is defined as
Lens shading rate=(effective maximum outside diameter of diameter/lens face of the shading light part of lens face).
If in the range of conditional (1), lens shading rate can be maintained small, and the bright of lens can be made
Brightness brightens.In addition, in the case where the catadioptric optical system is installed on the very small and thin space of mobile phone etc.,
Since first refractive face, i.e. entrance pupil is ring-type, compared to aberration caused by plane of refraction and reflecting surface, diffraction is to dividing
Resolution brings the influence of bigger.Thus, when lens shading rate is more than conditional (1) and becomes larger, i.e. when the change of the width of ring is small,
Occur as the image degradation caused by the influence of diffraction, high resolution ratio can not be obtained.
The balance of the influence of lens outer diameter, diffraction when in view of catadioptric optical system is installed to photographic device etc.
When, conditional (1) is more preferably
0.35≤Hm2/Hm1≤0.65···········(1’)。
Also, in the conditional (1 '), upper limit value is preferably 0.60, and more preferably 0.55.In addition, the conditional (1 ')
Lower limiting value be preferably 0.36.
It, can be simultaneously to the by the way that the first refractive face and second reflecting surface are formed on single lens component
The mold of one plane of refraction and the second reflecting surface carries out machining, so as to improve coaxial precision.
In addition, by being configured to make the transmitted light in first refractive face, the reflected light of the first reflecting surface and the second reflecting surface
Reflected light through the face into image side of the first lens of single curvature, thus, it is possible to caused by inhibiting the bias of each lens face
Fuzzy generation in unilateral side etc., is ideal.
In the catadioptric optical system of the first invention, it is desirable to which the face into image side of first lens is continuous
Curved surface.When the face into image side of first lens is made to be continuous curve surface, it can make multiple light beams overlappingly by described the
The face into image side of one lens.Thereby, it is possible to thicker light beam is made to be reflected at defined lens face.In addition, when make described the
When the face into image side of one lens is continuous curve surface, compared with the non-uniform situation of face shape, even if occurring in assembling eccentric
Face is incident to so as to each beam deviation, it also can be by the degradation inhibiting of the asymmetrical picture such as unilateral fuzzy to minimum limit.
Here, continuous curve surface refers to smooth and continuous face, preferably meet shape with same radius of curvature and
The face of at least one of the shape of same asphericity coefficient shape, but for example can also be that radius of curvature gradually changes like that
Curved surface.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (2).
0.5≤|d/Y|≤4.5········(2)
Wherein,
D is the air equivalent interval of the first reflecting surface and the second reflecting surface,
Y is maximum image height.
Here, the air equivalent interval of the first reflecting surface and the second reflecting surface refers to the first reflecting surface and the second reflecting surface
The distance on optical axis be scaled the obtained value of Ullage.
Conditional (2) is associated with low back of the body coefficient and the spherical aberration and comet aberration that have an impact to resolution ratio
Conditional.When more than the upper limit of conditional (2), the air equivalent interval of the first reflecting surface and the second reflecting surface is caused to become larger,
Low back of the body coefficient becomes larger, therefore be undesirable.It is preferable although low back of the body coefficient becomes smaller when more than the lower limit of conditional (2)
, but if making the air equivalent interval too small of the first reflecting surface and the second reflecting surface, make from the incidence of first refractive face
Light is sharp bent before the second reflecting surface in the same face is reached, therefore generates larger spherical aberration and comet picture
Difference, it is difficult to be corrected.
From the point of view of these effects are obtained, the upper limit value of conditional (2) is preferably 3.0, and more preferably 2.5, further
Preferably 2.0.In addition, the lower limiting value of conditional (2) is preferably 0.6, and more preferably 0.7, it is still more preferably 0.8.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (3).
0.2≤(f12)/f≤0.6········(3)
Wherein,
F12 is the synthesis focal length from first refractive face to the first reflecting surface,
F is the focal length of the catadioptric optical system.
Conditional (3) is condition associated with lens overall length and resolution ratio, especially spherical aberration and comet aberration
Formula.When more than the upper limit of conditional (3), lens overall length is elongated, is undesirable.When more than the lower limit of conditional (3), though
Right lens overall length shortens, and is ideal, it can be difficult to correction spherical aberration and comet aberration.
By meeting the upper limit of conditional (3), that is making positive refraction from first refractive face to the first reflecting surface
Power becomes strong, can reduce ray height before the light for being incident to first refractive face is incident on the first reflecting surface.It is anti-first
The light that the face of penetrating is reflected by the light with being incident to first refractive face before the first reflecting surface is reached by
The identical face in face is incident to the second reflecting surface after thus further reducing ray height.According to the situation, it can reach simultaneously and subtract
The effective diameter of small second reflecting surface makes catadioptric optical system brighten and reduces low back of the body coefficient.
From the point of view of these effects are obtained, the upper limit value of conditional (3) is preferably 0.55, and more preferably 0.5, further
Preferably 0.45.In addition, the lower limiting value of conditional (3) is preferably 0.25, more preferably 0.3.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (4).
Vp1>Vp2····················(4)
Wherein,
Vp1 is the Abbe number of the first lens,
Vp2 is the Abbe number of the second lens.
Conditional (4) is the formula related with the material of the first lens and the second lens, represents the Abbe number of the second lens
Less than the Abbe number of the first lens.
The plane of refraction of first lens all has positive refracting power, generates positive chromatic aberation.In addition, the periphery of the second lens
The plane of refraction in region makes chromatic aberation cancel out each other since light passes twice through.Therefore, in the neighboring area of the second lens
Plane of refraction is nearly free from chromatic aberation.On the other hand, the central part of the second lens is generated due to having negative refracting power
The chromatic aberation of negative sense.
The optical system of the present invention has a positive refracting power due to whole, and the central parts of the second lens has than the
The weak negative refracting power of the positive refracting powers of one lens.Based on the situation, it is preferred that the second lens are less than the using Abbe number
The material of the Abbe number of one lens is so that the chromatic aberation generated at various pieces is cancelled out each other and is corrected.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (5).
f/fr2≤1.5····················(5)
Wherein,
F is the focal length of the catadioptric optical system,
Fr2 is the focal length of the central part of second lens.
Conditional (5) is the formula of the refracting power and the ratio between whole refracting power for the central part for defining the second lens.
It is by the inverse (1/fr2) of the focal length of the central area of the second lens that is, since refracting power is the inverse of focal length
Divided by obtained from the inverse (1/f) of the focal length of optical system entirety.
The focal length of the central part of second lens refers to from the central area of the object side of the second lens to the second lens
The central area into image side synthesis focal length.The central part of second lens preferably has negative refracting power or weak positive
Refracting power.When more than the upper limit of conditional (5), positive refracting power is caused to become too strong, therefore make what is rolled on the light beam outside axis
Declines so as to which visual angle narrows, are unsuitable for simulating zoom lens.
Also, in order to prevent since the resolution ratio outside the axis caused by the inclination of image planes is deteriorated, it is preferred that conditional (5)
Meet
-1.8≤f/fr2≤1.5·············(5’)。
Also, the upper limit value of conditional (5) is preferably 1.4, and more preferably 1.3.In addition, the lower limiting value of conditional (5) is excellent
It is selected as -1.7, more preferably -1.5.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (6).
0.8≤D/f≤1.5··············(6)
Wherein,
D is the optics overall length of the catadioptric optical system,
F is the focal length of the catadioptric optical system.
Conditional (6) be define dolly-out, dolly-back than formula.Here, optics overall length refers to the institute being had an impact to optical characteristics
There is the total at the interval in the direction of the optical axis of element, be to instigate the optical axis after being turned to by reflecting surface in catadioptric optical system
In the case of extended slave the first face of object side to the distance into the final face in image side.When more than the lower limit of conditional (6), respectively
The refracting power for forming lens becomes strong, therefore aberration increases, and the resolution ratio outside axis and on axis is deteriorated.Even if refringent/reflection lens reduce remote
Ratio is taken the photograph, can also shorten lens overall length.When more than the upper limit of conditional (6), since optics overall length becomes long and lens are total
Length is elongated, causes the superiority using refringent/reflection lens is not present compared with refractor.
From the point of view of these effects are obtained, the upper limit value of conditional (6) is preferably 1.4, and more preferably 1.3, further
Preferably 1.1.In addition, the lower limiting value of conditional (6) is more preferably 0.9.
It is desirable that, the catadioptric optical system of the first invention meets following conditional (7).
1.6≤TL/Y≤3.0·············(7)
Wherein,
TL is the lens overall length of the catadioptric optical system,
Y is maximum image height.
Conditional (7) is the formula defined as the low back of the body.When more than the upper limit of conditional (7), relative to optical system
Maximum image height for lens overall length become larger, optical system is caused to maximize.When more than the lower limit of conditional (7), need
The focal power in each face is made to become larger, so as to generate larger spherical aberration and comet aberration, it is difficult to be corrected.
From the point of view of these effects are obtained, the upper limit value of conditional (7) is preferably 2.8, preferably 2.6, preferably 2.4,
More preferably 2.3.In addition, the lower limiting value of conditional (7) is preferably 1.8, also preferably 1.9, more preferably 2.0.
In the catadioptric optical system of the first invention, it is desirable to which the first refractive face is with from close to optical axis
Part tends to periphery, from convex variation to be recessed when from object side.
The catadioptric optical system of the first invention can advantageously carry out comet picture by forming first refractive face like this
The correction of difference and the spherical aberration of high-order.
In the catadioptric optical system of the first invention, it is desirable to which the first reflecting surface and the second reflecting surface are rear surfaces
Speculum.
The catadioptric optical system of the first invention is by making the first reflecting surface and the second reflecting surface for back-surface mirror, energy
Minute surface adhesive dust is enough prevented, and can effectively protect minute surface from damage.In addition, it can ensure smaller low back of the body system
While number, make to increase the effective face of the correction of spherical aberration etc..
The photographic device of second invention is by having the catadioptric optical system of the first invention and being configured at the catadioptric
Photographing element at the image space of optical system and form.
The photographic device of the second invention formed like this can form have it is bright, with long-focus and with smaller
Low back of the body coefficient slim catadioptric optical system photographic device.
When the catadioptric optical system of the first invention to be used to an imaging optical system for simulation zoom lens, the
The photographic device of two inventions can form more effectively becoming clear, with smaller using the catadioptric optical system of the first invention
It is low the back of the body coefficient and be long-focus effect and with high imaging performance photographic device.
Hereinafter, illustrate the implementation of the catadioptric optical system of the first invention and the photographic device of the second invention with reference to the accompanying drawings
Example.About each embodiment, represent to be shown below the constant of the cone shown in formula and the aspherical system of even-order in the table of asphericity coefficient
Number.
Z=ch2/[1+{1-(1+k)c2h2}1/2]+A4h4+A6h6+A8h8+A10h10···
(wherein, c represent curvature (1/r), h represent relative to optical axis height, k represent circular cone coefficient, A4, A6, A8,
A10 represents the asphericity coefficient of each order)
First lens L1, the second lens L2, plane of refraction R1, refraction are shown in the optical cross section figure of catadioptric optical system
Face R2, plane of refraction R3, plane of refraction R4, plane of refraction R5, plane of refraction R6, plane of refraction R7, plane of refraction R8, plane of refraction R9, plane of refraction
R10, the first reflecting surface M1, the second reflecting surface M2.
In the aberration diagram of embodiment, chain-dotted line represents the spherical aberration of wavelength 656nm.Solid line represents wavelength 588nm's
Spherical aberration.Long dotted line represents the spherical aberration of wavelength 546nm.Middle dotted line represents the spherical aberration of wavelength 486nm.Short dash line table
The spherical aberration of the long 436nm of oscillography.
In spherical aberration diagram, " shielded light beam " represent into the light beam of the first lens entrance by the second reflecting surface
The light beam of masking does not intervene optical property.On the other hand, represent that " efficient beam " of light beam for having passed through optical system is shown
Intervene the spherical aberration of optical property.
(first embodiment)
As shown in Figure 1, the structure of the catadioptric optical system of first embodiment has the first lens L1 and the second lens L2.
There is plane of refraction R1 (first refractive face) in the neighboring area in the face of the object side of the first lens L1, first thoroughly
The central area in the face of the object side of mirror L1 has the second reflecting surface M2.Also, in the face into image side of the first lens L1
Neighboring area has plane of refraction R2, has plane of refraction R5 and plane of refraction in the central area in the face into image side of the first lens L1
R6。
There is plane of refraction R3 in the neighboring area in the face of the object side of the second lens L2, in the subject of the second lens L2
The central area in the face of side has plane of refraction R4 and plane of refraction R7.Also, in the peripheral region in the face into image side of the second lens L2
Domain has the first reflecting surface M1, has plane of refraction R8 (the second refractions in the central area in the face into image side of the second lens L2
Face).
Second lens L2 is configured anti-ghost image plate B between the plane of refraction R4 in the face of object side and plane of refraction R7, and
Into forming anti-ghost image V slots C between the first reflecting surface M1 in the face of image side and plane of refraction R8.
The spherical aberration of the catadioptric optical system of first embodiment is shown in FIG. 2.
The lens data of the catadioptric optical system of first embodiment is shown in table 1.First embodiment is shown in table 2
Catadioptric optical system asphericity coefficient.
[table 1]
| It numbers in face | Curvature | Face interval | Refractive index | Abbe number | Internal diameter | Outer diameter | |||
| 1 | First refractive face | It is aspherical | Refraction | 11.015 | 1.970 | 1.531 | 56.044 | 2.51 | 4.00 |
| 2 | It is aspherical | Refraction | -18.837 | 1.209 | |||||
| 3 | It is aspherical | Refraction | -17.689 | 1.000 | 1.614 | 25.575 | |||
| 4 | First reflecting surface | It is aspherical | Reflection | -20.377 | -1.000 | 1.614 | 25.575 | 2.20 | 4.00 |
| 5 | Aperture | It is aspherical | Refraction | -17.689 | -1.209 | ||||
| 6 | It is aspherical | Refraction | -18.837 | -1.620 | 1.531 | 56.044 | |||
| 7 | Second reflecting surface | It is aspherical | Reflection | -12.908 | 1.620 | 1.531 | 56.044 | 1.88 | |
| 8 | It is aspherical | Refraction | -18.837 | 1.959 | |||||
| 9 | It is aspherical | Refraction | -2.464 | 0.750 | 1.614 | 25.575 | 1.90 | ||
| 10 | Second plane of refraction | It is aspherical | Refraction | -3.379 | 0.500 | 2.15 | |||
| 11 | Protective glass | Spherical surface | Refraction | ∞ | 0.210 | 1.517 | 64.198 | ||
| 12 | Protective glass | Spherical surface | Refraction | ∞ |
[table 2]
(second embodiment)
As shown in figure 3, the structure of the catadioptric optical system of second embodiment has the first lens L1 and the second lens L2.
There is plane of refraction R1 (first refractive face) in the neighboring area in the face of the object side of the first lens L1, first thoroughly
The central area in the face of the object side of mirror L1 has the second reflecting surface M2.Also, in the face into image side of the first lens L1
Neighboring area has plane of refraction R2, has plane of refraction R5 and plane of refraction in the central area in the face into image side of the first lens L1
R6。
There is plane of refraction R3 in the neighboring area in the face of the object side of the second lens L2, in the subject of the second lens L2
The central area in the face of side has plane of refraction R4 and R7, also, has in the neighboring area in the face into image side of the second lens L2
First reflecting surface M1 has plane of refraction R8 (the second plane of refraction) in the central area in the face into image side of the second lens L2.
Second lens L2 is configured anti-ghost image plate B between the plane of refraction R4 in the face of object side and plane of refraction R7, and
Into forming anti-ghost image V slots C between the first reflecting surface M1 in the face of image side and plane of refraction R8.
The spherical aberration of the catadioptric optical system of second embodiment is shown in FIG. 4.
The lens data of the catadioptric optical system of second embodiment is shown in table 3.Second embodiment is shown in table 4
Catadioptric optical system asphericity coefficient.
[table 3]
| It numbers in face | Curvature | Face interval | Refractive index | Abbe number | Internal diameter | Outer diameter | |||
| 1 | First refractive face | It is aspherical | Refraction | 12.483 | 1.772 | 1.531 | 56.044 | 2.37 | 3.10 |
| 2 | It is aspherical | Refraction | -18.088 | 1.387 | |||||
| 3 | It is aspherical | Refraction | -14.100 | 1.000 | 1.614 | 25.575 | |||
| 4 | First reflecting surface | It is aspherical | Reflection | -18.201 | -1.000 | 1.614 | 25.575 | 2.10 | 3.10 |
| 5 | Aperture | It is aspherical | Refraction | -14.100 | -1.387 | ||||
| 6 | It is aspherical | Refraction | -18.088 | -1.422 | 1.531 | 56.044 | |||
| 7 | Second reflecting surface | It is aspherical | Reflection | -13.150 | 1.422 | 1.531 | 56.044 | 1.60 | |
| 8 | It is aspherical | Refraction | -18.088 | 2.137 | |||||
| 9 | It is aspherical | Refraction | -2.321 | 0.750 | 1.614 | 25.575 | 1.82 | ||
| 10 | Second plane of refraction | It is aspherical | Refraction | -3.117 | 0.200 | 2.10 | |||
| 11 | Protective glass | Spherical surface | Refraction | ∞ | 0.210 | 1.517 | 64.198 | 2.14 | |
| 12 | Protective glass | Spherical surface | Refraction | ∞ |
[table 4]
(3rd embodiment)
As shown in figure 5, the structure of the catadioptric optical system of 3rd embodiment has the first lens L1 and the second lens L2.
There is plane of refraction R1 (first refractive face) in the neighboring area in the face of the object side of the first lens L1, first thoroughly
The central area in the face of the object side of mirror L1 has the second reflecting surface M2.Also, in the face into image side of the first lens L1
Neighboring area has plane of refraction R2, has plane of refraction R5 and plane of refraction in the central area in the face into image side of the first lens L1
R6。
There is plane of refraction R3 in the neighboring area in the face of the object side of the second lens L2, in the subject of the second lens L2
The central area in the face of side has plane of refraction R4 and plane of refraction R7.Also, in the peripheral region in the face into image side of the second lens L2
Domain has the first reflecting surface M1, has plane of refraction R8 (the second refractions in the central area in the face into image side of the second lens L2
Face).
First lens L1 forms anti-ghost image V slots C between the plane of refraction R1 and the second reflecting surface M2 in the face of object side.Separately
Outside, anti-ghost image plate B is configured in the second lens L2 between the plane of refraction R4 in the face of object side and plane of refraction R7.
The spherical aberration of the catadioptric optical system of 3rd embodiment is shown in FIG. 6.
The lens data of the catadioptric optical system of 3rd embodiment is shown in table 5.In table 5, face number 8 is virtual
Face represents position and the outer diameter of anti-ghost image plate B.The aspherical system of the catadioptric optical system of 3rd embodiment is shown in table 6
Number.
[table 5]
| It numbers in face | Curvature | Face interval | Refractive index | Abbe number | Internal diameter | Outer diameter | |||
| 1 | First refractive face | It is aspherical | Refraction | 9.085 | 2.355 | 1.531 | 56.044 | 2.36 | 4.45 |
| 2 | It is aspherical | Refraction | -42.349 | 0.737 | |||||
| 3 | It is aspherical | Refraction | -12.865 | 1.000 | 1.614 | 25.575 | |||
| 4 | First reflecting surface | It is aspherical | Reflection | -14.537 | -1.000 | 1.614 | 25.575 | 2.30 | 4.40 |
| 5 | Aperture | It is aspherical | Refraction | -12.865 | -0.737 | ||||
| 6 | It is aspherical | Refraction | -42.349 | -1.855 | 1.531 | 56.044 | |||
| 7 | First reflecting surface | It is aspherical | Reflection | -9.851 | 1.855 | 1.531 | 56.044 | 1.65 | |
| 8 | It is aspherical | Refraction | -42.349 | 0.250 | |||||
| 9 | Spherical surface | ∞ | 1.007 | 1.75 | |||||
| 10 | It is aspherical | Refraction | -4.832 | 0.800 | 1.614 | 25.575 | 1.80 | ||
| 11 | Second plane of refraction | It is aspherical | Refraction | -10.182 | 0.500 | 2.14 | |||
| 12 | Protective glass | Spherical surface | Refraction | ∞ | 0.210 | 1.517 | 64.198 | ||
| 13 | Protective glass | Spherical surface | Refraction | ∞ |
[table 6]
(fourth embodiment)
As shown in fig. 7, the structure of the catadioptric optical system of fourth embodiment have the first lens L1, the second lens L2 with
And third lens L3.
There is plane of refraction R1 (first refractive face) in the neighboring area in the face of the object side of the first lens L1, first thoroughly
The central area in the face of the object side of mirror L1 has the second reflecting surface M2.Also, in the face into image side of the first lens L1
Neighboring area has plane of refraction R2, has plane of refraction R5 and plane of refraction in the central area in the face into image side of the first lens L1
R6。
There is plane of refraction R3 in the neighboring area in the face of the object side of the second lens L2, in the subject of the second lens L2
The central area in the face of side has plane of refraction R9.Also, have first in the neighboring area in the face into image side of the second lens L2
Reflecting surface M1 has plane of refraction R10 (the second plane of refraction) in the central area in the face into image side of the second lens L2.
There is plane of refraction R7 in the face of the object side of third lens L3.Also, in the face into image side of third lens L3
With plane of refraction R8.
Anti- ghost image plate B is configured in third lens L3 around it, and the anti-ghost image plate B configurations are in the shot of the second lens L2
Position between the plane of refraction R4 and R9 in the face on side.
The spherical aberration of the catadioptric optical system of fourth embodiment is shown in FIG. 8.
The lens data of the catadioptric optical system of fourth embodiment is shown in table 7.Fourth embodiment is shown in table 8
Catadioptric optical system asphericity coefficient.
[table 7]
| It numbers in face | Curvature | Face interval | Refractive index | Abbe number | Internal diameter | Outer diameter | |||
| 1 | First refractive face | It is aspherical | Refraction | -25.142 | 1.064 | 1.531 | 56.044 | 2.4 | 4.0 |
| 2 | It is aspherical | Refraction | -11.380 | 1.737 | |||||
| 3 | It is aspherical | Refraction | -11.279 | 0.900 | 1.614 | 25.575 | |||
| 4 | First reflecting surface | It is aspherical | Reflection | -12.110 | -0.900 | 1.614 | 25.575 | 2.4 | 4.5 |
| 5 | Aperture | It is aspherical | Refraction | -11.279 | -1.737 | ||||
| 6 | It is aspherical | Refraction | -11.380 | -1.064 | 1.531 | 56.044 | |||
| 7 | Second reflecting surface | It is aspherical | Reflection | -8.478 | 1.064 | 1.531 | 56.044 | 1.9 | |
| 8 | It is aspherical | Refraction | -11.380 | 1.837 | |||||
| 9 | It is aspherical | Refraction | -2.772 | 0.800 | 1.614 | 25.575 | 1.8 | ||
| 10 | It is aspherical | Refraction | -2.858 | 0.458 | 2.0 | ||||
| 11 | It is aspherical | Refraction | -2.416 | 0.450 | 1.614 | 25.575 | 2.0 | ||
| 12 | Second plane of refraction | It is aspherical | Refraction | -4.417 | 0.300 | ||||
| 13 | Protective glass | Spherical surface | Refraction | ∞ | 0.210 | 1.517 | 64.198 | ||
| 14 | Protective glass | Spherical surface | Refraction | ∞ |
[table 8]
(the 5th embodiment)
As shown in figure 9, the structure of the catadioptric optical system of the 5th embodiment have the first lens L1, the second lens L2 with
And the 4th lens L4.
There is plane of refraction R1 (first refractive face) in the neighboring area in the face of the object side of the first lens L1, first thoroughly
The central area in the face of the object side of mirror L1 has the second reflecting surface M2.Also, in the face into image side of the first lens L1
Neighboring area has plane of refraction R2, has plane of refraction R5 and plane of refraction in the central area in the face into image side of the first lens L1
R6。
There is plane of refraction R3 in the neighboring area in the face of the object side of the second lens L2, in the subject of the second lens L2
The central area in the face of side has plane of refraction R4 and plane of refraction R7.Also, in the peripheral region in the face into image side of the second lens L2
Domain has the first reflecting surface M1, has plane of refraction R8 (the second refractions in the central area in the face into image side of the second lens L2
Face).
There is plane of refraction R9 in the central area in the face of the object side of the 4th lens L4.Also, the 4th lens L4's
There is plane of refraction R10 into the face of image side.
First lens L1 forms anti-ghost image V slots C between the plane of refraction R1 and the second reflecting surface M2 in the face of object side.Separately
Outside, anti-ghost image plate B is configured in the second lens L2 between the plane of refraction R4 in the face of object side and plane of refraction R7.
The spherical aberration of the catadioptric optical system of the 5th embodiment is shown in FIG. 10.
The lens data of the catadioptric optical system of the 5th embodiment is shown in table 9.The 5th implementation is shown in table 10
The asphericity coefficient of the catadioptric optical system of example.
[table 9]
| It numbers in face | Curvature | Face interval | Refractive index | Abbe number | Internal diameter | Outer diameter | |||
| 1 | First refractive face | It is aspherical | Refraction | -285.549 | 10.23 | 1.531 | 56.044 | 19.0 | 30.0 |
| 2 | It is aspherical | Refraction | -117.901 | 16.97 | |||||
| 3 | It is aspherical | Refraction | -112.891 | 9.00 | 1.614 | 25.575 | |||
| 4 | First reflecting surface | It is aspherical | Reflection | -119.797 | -9.00 | 1.614 | 25.575 | 19.0 | 39.2 |
| 5 | Aperture | It is aspherical | Refraction | -112.891 | -16.97 | ||||
| 6 | It is aspherical | Refraction | -117.901 | -10.23 | 1.531 | 56.044 | |||
| 7 | Second reflecting surface | It is aspherical | Reflection | -85.013 | 10.23 | 1.531 | 56.044 | 15.3 | |
| 8 | It is aspherical | Refraction | -117.901 | 17.97 | |||||
| 9 | It is aspherical | Refraction | -27.331 | 8.00 | 1.614 | 25.575 | 9.8 | ||
| 10 | Second plane of refraction | It is aspherical | Refraction | -21.844 | 0.20 | 9.9 | |||
| 11 | It is aspherical | Refraction | -20.893 | 4.50 | 1.614 | 25.575 | 9.9 | ||
| 12 | It is aspherical | Refraction | -44.640 | 3.00 | |||||
| 13 | Protective glass | Spherical surface | Refraction | ∞ | 2.10 | 1.517 | 64.198 | ||
| 14 | Protective glass | Spherical surface | Refraction | ∞ | 9.54 |
[table 10]
Then, the optical data (mm) of each embodiment and optical property value are shown.
The value of the conditional (1) of each embodiment described below.
The value of the conditional (2) of each embodiment described below.
The value of the conditional (3) of each embodiment described below.
The value of the conditional (4) of each embodiment described below.
The value of the conditional (5) of each embodiment described below.
The value of the conditional (6) of each embodiment described below.
The value of the conditional (7) of each embodiment described below.
As shown in figure 11, the first embodiment of the photographic device of the second invention of the application, which has, forms the catadioptric of the first invention
Penetrate the first protective glass G11, the first lens L1 and the second lens L2 of optical system 100, configuration they into the of image side
Two protective glass G12 and the first photographing element P1 being configured at the image space of the catadioptric optical system.These are formed
Element is supported by the first shell H1.Led to after carry out digital zoom processing from the picture signal that the first photographing element P1 is exported
Display (not shown) is crossed to perform image display.
As shown in figure 12, the second embodiment of the photographic device of the second invention of the application is in addition to having second invention
Other than first catadioptric optical system 100 of the photographic device of first embodiment, be also equipped with have the first protective glass G11,5
Lens L21, L22, L23, L24, L25, configuration are in these lens into the third protective glass G3 of image side and configuration in the folding
Penetrate the dioptric system 200 of the second photographing element P2 at the image space of optical system.First catadioptric optical system 100
Optical axis with the second dioptric system 200 is substantially parallel, their zoom camera region is continuous.These are formed
Element is supported by second housing H2.
To carrying out digital zoom processing respectively from the picture signal of the first photographing element P1 and the second photographing element P2 outputs
After choose one of them to be performed image display by display (not shown).First catadioptric optical system 100 is responsible for dolly-out,ing dolly-back
Zoom area, the second dioptric system 200 are responsible for wide-angle zoom region.
As shown in figure 13, the movement of the photographic device of the second embodiment of the photographic device of the second invention of the application is installed
First catadioptric optical system 100 and the second dioptric system 200 are configured at camera window T by phone, and camera window T is arranged on
The corner at the back side without configuration display (not shown) of mobile phone 500.
Claims (12)
1. a kind of catadioptric optical system, including the first lens and the second lens, second lens with first lens it
Between setting airspace mode be configured than first lens by position into image side, the spy of the catadioptric optical system
Sign is,
The neighboring area in the face of the object side of first lens is first refractive face, in the object side of first lens
Face central area formed the second reflecting surface,
The central area in the face into image side of second lens is the second plane of refraction, in the face into image side of second lens
Neighboring area formed the first reflecting surface,
The catadioptric optical system meets following conditional (1),
Hm2/Hm1≤0.65·········(1)
Wherein,
Hm2 is the effective diameter of second reflecting surface,
Hm1 is the effective diameter of first reflecting surface.
2. catadioptric optical system according to claim 1, which is characterized in that
The face into image side of first lens is continuous curve surface.
3. catadioptric optical system according to claim 1 or 2, which is characterized in that
Meet following conditional (2),
0.5≤|d/Y|≤4.5········(2)
Wherein,
D is the air equivalent interval of first reflecting surface and second reflecting surface,
Y is maximum image height.
4. the catadioptric optical system according to any one of claims 1 to 3, which is characterized in that
Meet following conditional (3),
0.2≤(f12)/f≤0.6······(3)
Wherein,
F12 is the synthesis focal length until the first refractive face to first reflecting surface,
F is the focal length of the catadioptric optical system.
5. the catadioptric optical system according to any one of Claims 1 to 4, which is characterized in that
Meet following conditional (4),
Vp1>Vp2··············(4)
Wherein,
Vp1 is the Abbe number of first lens,
Vp2 is the Abbe number of second lens.
6. the catadioptric optical system according to any one of Claims 1 to 5, which is characterized in that
Meet following conditional (5),
fr2/f≤1.0············(5)
Wherein,
Fr2 is the focal length of the central part of second lens,
F is the focal length of the catadioptric optical system.
7. the catadioptric optical system according to any one of claim 1~6, which is characterized in that
Meet following conditional (6),
0.8≤D/f≤1.5··········(6)
Wherein,
D is the optics overall length of the catadioptric optical system,
F is the focal length of the catadioptric optical system.
8. the catadioptric optical system according to any one of claim 1~7, which is characterized in that
Meet following conditional (7),
1.6≤TL/Y≤3.0·········(7)
Wherein,
TL is the lens overall length of the catadioptric optical system,
Y is maximum image height.
9. the catadioptric optical system according to any one of claim 1~8, which is characterized in that
The first refractive face is from convex variation when from object side with periphery is tended to from close to the part of optical axis
It is recessed.
10. the catadioptric optical system according to any one of claim 1~8, which is characterized in that
First reflecting surface and second reflecting surface are back-surface mirror.
11. a kind of photographic device, which is characterized in that have：
Catadioptric optical system according to any one of claim 1~8；And
Photographing element is configured at the image space of the catadioptric optical system.
12. a kind of photographic device has two optical systems and configuration at the respective image space of the two optical systems
Photographing element, which is characterized in that, at least one of described two optical systems be according to claim 1~
Catadioptric optical system described in any one of 8.
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| JP2016256557A JP6917000B2 (en) | 2016-12-28 | 2016-12-28 | Catadioptric system and imaging device |
| JP2016-256557 | 2016-12-28 |
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| JP6917000B2 (en) | 2021-08-11 |
| CN108254859B (en) | 2022-04-15 |
| JP2018109673A (en) | 2018-07-12 |
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