CN101609203B

CN101609203B - Zoom lens and an imaging apparatus incorporating the same

Info

Publication number: CN101609203B
Application number: CN2009101425169A
Authority: CN
Inventors: 市川启介
Original assignee: Olympus Imaging Corp
Current assignee: Olympus Corp
Priority date: 2008-06-20
Filing date: 2009-06-22
Publication date: 2011-01-05
Anticipated expiration: 2029-06-22
Also published as: CN101609203A; JP2010002684A

Abstract

The first lens group comprises a positive lens and a negative lens, and the total number of lenses in the first lens group is 2. The second lens group consists of, in order from the object side, a front unit of negative refracting power and a rear unit of positive refracting power. The third lens group consists of, in order from the object side, a front unit of positive refracting power and a rear unit of negative refracting power. The fourth lens group comprises a positive lens component, and the total number of lens components in the fourth lens group is 1. The front unit of the second lens group comprises a negative lens component, and the total number of lens components in the front unit of the second lens group is 1. The rear unit of the second lens group comprises, in order from the object side to the image side, a negative lens and a positive lens, and the total number of lenses in the rear unit of the second lens group is 2. The negative lens component in the front unit of the second lens group and the negative lens in the rear unit of the second lens group satisfy the following condition (1A): 2.9f2GN2/f2GN1 where f2GN1 is the focal length of the negative lens component in the front unit of the second lens group, and f2GN2 is the focal length of the negative lens in the rear unit of the second lens group.

Description

The camera head of zoom lens and this zoom lens of use

The application is to advocating right of priority 2009-004334 number June 20 in 2008 in Japanese publication 2008-161487 number of Japan's submission and the Japanese publication of submitting in Japan January 13 in 2009, and contents of these previous applications are quoted for your guidance in this article.

Technical field

The present invention relates to the camera head of zoom lens and this zoom lens of use.

Background technology

In recent years, replace the silver film camera, the digital camera that uses CCD and the such imaging apparatus of CMOS to take subject becomes main flow.And this digital camera with the popular style of high functional form to small compact, has some classifications in the scope from business widely.In the present invention, be focussed in particular on this classification of popular style of small compact.

The user of the digital camera of this popular style has easily photograph, enjoy happy expectation whenever and wherever possible in far-ranging scene.Therefore, in small goods, the digital camera that particularly is received into the thin type of taking in property size good, easy to carry, thickness direction in the pocket etc. of clothes and suitcase receives an acclaim, and camera lens system is also expected further miniaturization.And, the zone of photographing is required the field angle characteristic of wide-angle, obtain the zoom lens of optical property when requiring to be provided at the field angle of guaranteeing high zoom ratios and wide-angle side.

As the zoom lens of keeping easily than high zoom ratios, following patent documentation discloses the zoom lens of such type, that is: have the 1st lens combination of positive light coke, the 2nd lens combination of negative power, the 3rd lens combination of positive light coke and the 4th lens combination of positive light coke from object side, change focal length by making each length variations at interval that is clipped in each lens combination.

[patent documentation 1] TOHKEMY 2003-315676 communique

[patent documentation 2] TOHKEMY 2005-331628 communique

[patent documentation 3] TOHKEMY 2008-102165 communique

[patent documentation 4] TOHKEMY 2008-102165 communique

Yet although the invention of putting down in writing in patent documentation 1～patent documentation 4 is suitable for the slimming when being accommodated in zoom lens in the camera body, yet these inventions all are limited to about 65 ° in field angle to the angular direction of wide-angle side.

Summary of the invention

The present invention makes in view of above-mentioned problem, the purpose of this invention is to provide and a kind ofly helps guaranteeing miniaturization, wide-angleization and zoom ratio, and keeps the zoom lens of the image quality of photographs easily well.And, the purpose of this invention is to provide a kind of zoom lens that also suppresses manufacturing cost easily.And, the purpose of this invention is to provide a kind of camera head with such zoom lens.

In view of above-mentioned problem, zoom lens of the present invention from object side to having successively as side: the 1st lens combination with positive light coke; The 2nd lens combination with negative power; The 3rd lens combination with positive light coke; And the 4th lens combination with positive light coke, this zoom lens has the brightness diaphragm, this brightness diaphragm is compared with the 2nd lens combination to be configured in to compare as side and with the most close lens face as side in the 3rd lens combination and is configured in object side, from wide-angle side during to the telescope end zoom, it is big that interval between the 1st lens combination and the 2nd lens combination becomes, interval between the 2nd lens combination and the 3rd lens combination dwindles, and the interval between the 3rd lens combination and the 4th lens combination changes.

This from object side have positive and negative, just, the zoom lens of the type of positive power configuration helps guaranteeing zoom ratio.And, emergent pupil and image planes are separated, under the situation of using the electro-photographic element, help guaranteeing good image.

And,, help the pathization of the 3rd lens combination by the brightness diaphragm is configured in above-mentioned position.And,, also help aberration correction when to the height of the light of the 3rd lens combination incident hour.

And, in zoom lens of the present invention, and then be that the 1st lens combination is made of 1 piece of positive lens and 1 piece of negative lens.Thus, in thickness direction that helps the 1st lens combination and miniaturization radially, make and eliminate aberration each other between each lens and help proofreading and correct each aberration in the 1st lens combination, be suppressed at the aberration change when having carried out wide-angleization and high zoom ratios easily.

And, the 2nd lens combination adopts the structure that is made of group after the 2nd lens combination of group and positive light coke before the 2nd lens combination of negative power successively from object side, and the 3rd lens combination adopts the structure that is made of group after the 3rd lens combination of group and negative power before the 3rd lens combination of positive light coke successively from object side.

By such formation, the synthesis system of approaching the 1st lens combination and the 2nd lens combination has the symmetrical beam power configuration that is followed successively by positive light coke (the 1st lens combination), negative power (group before the 2nd lens combination), positive light coke (organizing after the 2nd lens combination) from object side near wide-angle side.

And, in the synthesis system of the 3rd lens combination and the 4th lens combination, also have the symmetrical beam power configuration that is followed successively by positive light coke (group before the 3rd lens combination), negative power (organizing after the 3rd lens combination), positive light coke (the 4th lens combination) from object side.

And the synthesis system of approaching the 2nd lens combination and the 3rd lens combination has the balanced configuration that is followed successively by negative power (group before the 2nd lens combination), positive light coke (organizing after the 2nd lens combination), positive light coke (group before the 3rd lens combination), negative power (organizing after the 3rd lens combination) from object side near telescope end.

Therefore, carry out easily near wide-angle side that Po Zi cuts down and the correction of (Petzval Sum), coma (coma), ratio chromatism, and spherical aberration, carry out easily near telescope end that Po Zi cuts down and, the correction of coma and ratio chromatism,, carry out wide-angleization and high zoom ratiosization easily.And, make the principal point of the 3rd lens combination rely on object easily, also guarantee zoom ratio easily.

And the 4th lens combination adopts the structure that is made of 1 positive lens composition, thus the slimming when also helping retraction.The 4th lens combination mainly plays the effect that emergent pupil and image planes are separated, thereby can reduce positive light coke.Therefore, by adopting said structure, help miniaturization and cost degradation.

In addition, the lens composition is defined as the phacoid that the plane of refraction that contacts with air only is object side plane of refraction and these 2 faces of picture side plane of refraction on optical axis.

And, the invention is characterized in, group has 1 negative lens composition before the 2nd lens combination, after the 2nd lens combination group adopt from object side to as side successively by negative lens and these 2 pieces of structures that lens constitute of positive lens, the formula (1A) that meets the following conditions of the negative lens after negative lens composition before the 2nd lens combination in the group and the 2nd lens combination in the group:

2.9＜f _2GN2/f _2GN1＜30 (1A)

Wherein, f _2GN1Be the focal length of the negative lens composition in the group before the 2nd lens combination,

f _2GN2It is the focal length of the negative lens in the group after the 2nd lens combination.

Under the situation of the field angle that will guarantee wide-angle side, the negative power of the 2nd lens combination increases easily.Therefore, by preceding group of the 2nd lens combination and back group are as above constituted, help guaranteeing the 2nd lens combination focal power, reduce aberration and reduce the thickness of the 2nd lens combination.

And, be negative lens by the lens that make the object side in the 2nd lens combination, make the principal point position of the 2nd lens combination easy at telescope end near the 3rd lens combination, help guaranteeing zoom ratio.

Conditional (1A) is determined the negative lens composition in the 2nd lens combination and the preferred light focal power balance of negative lens.

Negative power by the negative lens composition in the group before guaranteeing in the mode of the lower limit 2.9 that is not less than conditional (1A), help making entrance pupil to shoal and guarantee field angle, and when suppressing the thickness of back group by the negative power that suitably suppresses the negative lens in the group of back, guarantee the positive light coke of back group easily, obtain aberration balancing easily.

By not being higher than the upper limit 30 of conditional (1A), guaranteeing the negative power of the negative lens in the group of back, thereby guarantee the aberration correction effect of negative lens easily.

And, preferably, in wide-angle side, the 1st lens combination and the 2nd lens combination meet the following conditions formula (2A) and conditional (3A):

-1.8＜fnw/fw＜-0.5 (2A)

5＜fp/fw＜500 (3A)

Wherein, fnw is the focal length of the 1st lens combination and the preceding synthesis system of organizing of the 2nd lens combination of wide-angle side,

Fp is the focal length of organizing after the 2nd lens combination,

Fw is the total system focal length of the zoom lens of wide-angle side.

Conditional (2A) is determined the preferred focal length of the synthesis system of the 1st lens combination and the 2nd lens combination.And conditional (3A) is determined the preferred focal length organized after the 2nd lens combination.

Make the 1st lens combination of wide-angle side and the synthesis system of the preceding group of the 2nd lens combination have suitable negative power by mode, and group have suitable positive light coke after making the 2nd lens combination, can make the entrance pupil position rely on object with the formula of satisfying condition (2A), (3A).Thus, can further reduce the 1st lens combination radially and thickness direction, help miniaturization.

The lower limit-1.8 by being not less than conditional (2A) and the lower limit 5 of conditional (3A) make the entrance pupil position rely on object easily, help wide-angleization and miniaturization.

The upper limit-0.5 by not being higher than conditional (2A) and the upper limit 500 of conditional (3A) are particularly conducive to the spherical aberration that reduces telescope end.And, by the upper limit-0.5 that is not higher than conditional (2A), suppress easily the negative power of the negative lens composition of the 2nd lens combination, thereby suppress the poor of the center thickness of negative lens composition and edge thickness easily, thereby suppress the design limit that the processability by lens causes easily.

And, preferably, the negative lens formula (4A) that meets the following conditions after the 2nd lens combination in the group:

2.38＜f _2GN2/f _2G＜30 (4A)

Wherein, f _2GIt is the focal length of described the 2nd lens combination.

Conditional (4A) is determined the preferred light focal power of the negative lens in the 2nd lens combination.

Suitably suppress the focal power of negative lens by the mode with the lower limit 2.38 that is not less than conditional (4A), guarantee the slimming and the positive light coke of back group easily, the negative power of group helps guaranteeing wide-angleization, slimming and optical property before guaranteeing easily.

By guaranteeing the focal power of negative lens in the mode of the upper limit 30 that is not higher than conditional (4A), the negative power of group before suppressing easily helps reducing the aberration of side of looking in the distance.

And, preferably, the formula (5A) that meets the following conditions of the negative lens composition before the 2nd lens combination in the group:

-1.23＜f _2GN1/fw＜-0.1 (5A)

Wherein, fw is the total system focal length of the zoom lens of wide-angle side.

Conditional (5A) is determined the preferred light focal power of the negative lens composition in the preceding group of the 2nd lens combination.

By the lower limit-1.23 that is not less than conditional (5A), suitably guarantee the focal power of negative lens composition, thereby help the miniaturization of wide-angleization and the 1st lens combination.

By the upper limit-0.1 that is not higher than conditional (5A), the focal power that makes the negative lens composition does not excessively strengthen, thereby helps reducing the aberration of side of looking in the distance.

And, preferably, the positive lens formula (6A) that meets the following conditions after the 2nd lens combination in the group:

-5＜f _2GP/f _2G＜-0.2 (6A)

Wherein, f _2GPBe the focal length of the positive lens in the group after the 2nd lens combination,

f _2GIt is the focal length of the 2nd lens combination.

Conditional (6A) is determined the preferred light focal power of the positive lens in the group after the 2nd lens combination.

Guarantee positive light coke by mode, guarantee to eliminate the function of the aberration in the 2nd lens combination etc. easily with the lower limit-5 that is not less than conditional (6A).

By the upper limit-0.2 that is not higher than conditional (6A), suppress the surplus of the positive light coke of positive lens, thereby reduce focal power simultaneously easily in abutting connection with negative lens, when keeping aberration balancing well, make the 2nd lens combination slimming easily.

And preferably, the brightness diaphragm is configured between the 2nd lens combination and the 3rd lens combination.

Reduce the axle of the 3rd lens combination easily and go up thickness.And, make entrance pupil rely on object easily, more help the miniaturization of zoom lens.

And preferably, from wide-angle side during to the zoom of telescope end, the 3rd lens combination and brightness diaphragm move integratedly.

Driving mechanism when making zoom helps guaranteeing zoom ratio by miniaturization and the focal power of guaranteeing the 3rd lens combination when simplifying.

And, preferably, the 1st lens combination is made of negative lens and these 2 pieces of lens of positive lens successively from object side, negative lens in the 1st lens combination has the picture side, this has the absolute value of the paraxial curvature bigger than the absolute value of the paraxial curvature of object side as the side, positive lens in the 1st lens combination has the object side, and this object side mask has the absolute value of the paraxial curvature bigger than the absolute value of the paraxial curvature of picture side.

The absolute value of the paraxial curvature of the plane of refraction in opposite directions by making negative lens and positive lens alternately increases, and eliminates aberration easily.And,, thereby also suppress the generation of high order aberration easily because plane of refraction is recessed in the entrance pupil side in opposite directions.

And preferably, the negative lens composition before the 2nd lens combination in the group is the meniscus shape of convex surface towards object side, and the negative lens after the 2nd lens combination in the group is the concave-concave shape, and this negative lens has aspheric surface.

By the meniscus shape that is shaped as of the negative lens composition in organizing before making, near the incident angle of the off-axis ray wide-angle side of negative lens composition is incided in inhibition easily, suppresses the generation of the distortion aberration of surplus easily.Be shaped as the concave-concave shape by what make negative lens in the back group, in the balance that realizes aberration and off-axis aberration on the axle with the negative lens composition, help guaranteeing the negative power of the 2nd lens combination.And, because the negative lens in the group of back has aspheric surface, thereby more help proofreading and correct near the off-axis aberration wide-angle side.

And the negative lens composition before making the 2nd lens combination in the group is under the signal-lens situation, helps reducing the thickness of the 2nd lens combination and reducing cost.

And preferably, the negative lens composition before the 2nd lens combination in the group is the shape of the formula of meeting the following conditions (7A):

0.8＜(R _2GN1f+R _2GN1r)/(R _2GN1f-R _2GN1r)＜1.5 (7A)

Wherein, R _2GN1fBe the paraxial radius-of-curvature of the object side of the described negative lens composition in the group before described the 2nd lens combination,

R _2GN1rIt is the paraxial radius-of-curvature of the picture side of the described negative lens composition in the group before described the 2nd lens combination.

Conditional (7A) is determined the preferable shape of the negative lens composition of the preceding group of the 2nd lens combination.

By being not less than the lower limit 0.8 of conditional (7A), be suppressed near the incident angle of the axle outer light beam that incides the negative lens composition wide-angle side easily, help proofreading and correct the aberration of wide-angle side.

By not being higher than the upper limit 1.5 of conditional (7A), suppress the concave curvature of the picture side of negative lens composition easily, help proofreading and correct near the spherical aberration of telescope end.

And the negative lens after the 2nd lens combination in the group suppresses focal power easily and disposes lens in front and back, even thereby make the material of negative lens adopt plastics, also be difficult to be subjected to the influence that temperature humidity changes.And, adopt plastics by the material that makes negative lens, be non-spherical lens even make these lens, also processing easily.

In the object side that makes this negative lens or the either party at least of picture side under the aspheric situation, form aspheric surface along with the shape that negative power is increased, be preferred aspect the both sides of this aberration and off-axis aberration on axis calibration.

And, be aspheric surface all by object side and the picture side that makes this negative lens, help guaranteeing the aberration correction function of this negative lens.

And preferably, the negative lens after the 2nd lens combination in the group is the double-concave negative lens of the formula of meeting the following conditions (12A):

-0.8＜(R _2GN2f+R _2GN2r)/(R _2GN2f-R _2GN2r)＜0.9 (12A)

Wherein, R _2GN2fBe the paraxial radius-of-curvature of the object side of the described negative lens in the group after described the 2nd lens combination,

R _2GN2rIt is the paraxial radius-of-curvature of the picture side of the described negative lens in the group after described the 2nd lens combination.

Conditional (12A) is determined the preferable shape of the negative lens in the group after the 2nd lens combination.

By the lower limit-0.8 that is not less than conditional (12A), be suppressed near the incident angle of the axle outer light beam that incides negative lens the wide-angle side easily, help proofreading and correct the aberration of wide-angle side.

By not being higher than the upper limit 0.9 of conditional (12A), can make the lens face of the both sides of negative lens share negative power, help proofreading and correct near the spherical aberration of telescope end.

And preferably, negative lens and positive lens after the 2nd lens combination in the group are respectively simple lenses, negative lens be concave surface as the side, the object side of positive lens is the convex surface that has than the little paraxial radius-of-curvature of paraxial radius-of-curvature of the picture side of negative lens.

The focal power that can suppress negative lens, and can guarantee the aberration correction function of positive lens, in the slimming of carrying out the back group, carry out the correction of off-axis aberration easily.

And the positive lens after making the 2nd lens combination in the group is when being meniscus shape, the aberration that more helps the wide-angle side reduce and the 2nd lens combination after the slimming organized.

And group is made of 1 positive lens composition before the 3rd lens combination, and group is made of 1 negative lens composition after the 3rd lens combination, and this is being preferred aspect miniaturization of carrying out the 3rd lens combination.

At this moment, when the positive lens composition before making the 3rd lens combination in the group is the biconvex shape, can make a plurality of lens faces share the positive light coke of positive lens composition, help reducing spherical aberration.And the axle that convergence is dispersed from the 2nd lens combination is gone up light beam, helps the miniaturization of the 3rd lens combination.

And, all be aspheric surface by object side and the picture side that makes the positive lens composition in the group before the 3rd lens combination, more help reducing spherical aberration.

And, preferably, the concave surface that the most close face of organizing after the 3rd lens combination as side is an aspheric surface.

Utilize this concave surface, can have the function of spherical aberration that elimination is easy to generate in the 3rd lens combination etc.And, have such function easily: make an outer light beam towards direction refraction, guarantee, make zoom lens good towards the disposition far away of picture side towards the light height of the 4th lens combination incident away from optical axis.

By making this concave surface is aspheric surface, more helps proofreading and correct off-axis aberration.

And preferably, group is a convex surface towards object side and the concave surface negative lens composition towards the meniscus shape of picture side after the 3rd lens combination, and the formula that meets the following conditions (8A):

-0.6＜(R _3GNf-R _3GNr)/(R _3GNf+R _3GNr)＜0.8 (8A)

Wherein, R _3GNfBe the paraxial radius-of-curvature of the object side of the described negative lens composition in the group after described the 3rd lens combination,

R _3GNrIt is the paraxial radius-of-curvature of the picture side of the described negative lens composition in the group after described the 3rd lens combination.

By such formation, make the principal point of the 3rd lens combination rely on object easily.Thus, make 2nd lens combination of the principal point of the 3rd lens combination easily, help guaranteeing zoom ratio near negative power at telescope end.

And, be convex surface by the object side that makes the negative lens composition, with the light beam that the common convergence of group before the 3rd lens combination is dispersed from the 2nd lens combination, more help the 3rd lens combination in radially miniaturization.

And, be concave surface by what make the negative lens composition as the side, the spherical aberration that easy elimination is easy to generate in the 3rd lens combination etc.And, guarantee easily to help guaranteeing the disposition far away of zoom lens towards the light height of the 4th lens combination incident.

Conditional (8A) is the inverse of the shape coefficient (shape factor) of the negative lens composition of meniscus shape.

By the lower limit-0.6 that is not less than conditional (8A), guarantee the negative power of picture side, thereby eliminate the aberration in the 3rd lens combination easily.

By not being higher than the upper limit 0.8 of conditional (8A), guarantee the positive light coke of the object side of negative lens composition, thereby the effect that the principal point that can guarantee to make the 3rd lens combination relies on the effect of object and shares the positive light coke of the 3rd lens combination helps miniaturization and high zoom ratiosization.Perhaps, by avoiding that the negative power as the side of negative composition lens combination is excessively strengthened, suppress coma and astigmatism easily.

And preferably, described the 3rd lens combination has the negative lens of the formula of meeting the following conditions (9A):

15＜v3n＜35 (9A)

Wherein, v3n is the Abbe number of the arbitrary negative lens in described the 3rd lens combination.

Conditional (9A) is the optimum condition about the material of the negative lens in the 3rd lens combination.

By being not less than the lower limit 15 of conditional (9A), suppress the unusual dispersed increase of the material of negative lens easily, suppress the surplus of chromatic aberration correction easily.

By not being higher than the upper limit 35 of conditional (9A), guarantee the dispersion of negative lens, thereby help proofreading and correct the aberration in the 3rd lens combination.

And, preferably, the 3rd lens combination formula (10A) that meets the following conditions:

10＜v3p _ave-v3n _ave＜70 (10A)

Wherein, v3p _AveBe the mean value of the Abbe number of all positive lenss in described the 3rd lens combination,

V3n _AveBe the mean value of the Abbe number of all negative lenses in described the 3rd lens combination.

Conditional (10A) is the optimum condition about the material of the lens that constitute the 3rd lens combination.

By being not less than the lower limit 10 of conditional (10A), guarantee that the Abbe number of these 2 kinds of lens of positive lens and negative lens is poor, thereby suppress the generation of the aberration in the 3rd lens combination easily, suppress the generation of the aberration in total zoom area easily.

And,, guarantee the cost degradation of the lens material that will use and the easness of lens processing easily by not being higher than the upper limit 70 of conditional (10A).

And preferably, the positive lens composition in the 4th lens combination is the meniscus shape of convex surface towards object side.

By adopting above-mentioned shape, can make the principal point of the 4th lens combination rely on object, can make the 4th lens combination near image planes.

Therefore, can reduce to help making the device integral miniaturization that comprises mechanical mechanism when the amount of pulling out when the retraction state is pulled out the 4th lens combination.

At this moment, preferably, in order to reduce the off-axis aberration at the convex surface of the object side of the 4th lens combination, making this face is aspheric surface.

And the 4th lens combination can constitute by having aspheric 1 piece of falcate simple lens.Help guaranteeing miniaturization and performance.

And, from remote thing when closely thing is focused, the 4th lens combination can move to object side.

Preferably, the 4th lens combination is from carrying out miniaturization and easily and disposing employing focusing lens group in view of the structure of Focusing mechanism.

And, preferably, with respect to wide-angle side, at telescope end, the 1st lens combination is positioned at object side, and with respect to wide-angle side, at telescope end, the 3rd lens combination is positioned at object side, with respect to wide-angle side, at telescope end, it is big that the interval of the 3rd lens combination and the 4th lens combination becomes, and from wide-angle side during to the zoom of telescope end, the 2nd lens combination and the 4th lens combination move.

By reducing length overall in the wide-angle side, help miniaturization and wide-angleization, guarantee the zoom function of the 2nd lens combination and the 3rd lens combination easily.And the 2nd lens combination and the 4th lens combination also move when zoom, thereby carry out the adjustment of image planes position when suppressing the aberration change easily.

And, preferably, the zoom lens formula (11A) that meets the following conditions:

4＜ft/fw (11A)

Wherein, fw is the focal length of the zoom lens total system of wide-angle side,

Ft is the focal length of the zoom lens total system of telescope end.

Conditional (11A) is determined the preferred zoom ratio of zoom lens.

By being not less than the lower limit 4 of conditional (11A), guarantee zoom ratio, thereby can enlarge the scope of photography performance.

And, camera head of the present invention has zoom lens and imaging apparatus, this imaging apparatus has the shooting face of the picture side that is configured in zoom lens, and the optical image on the shooting face that will be formed by zoom lens converts electric signal to, and zoom lens is the zoom lens of top any one narration.

Thus, can provide a kind of camera head that has compact conformation, helps guaranteeing zoom ratio and field angle and guarantee the zoom lens of optical property simultaneously.

And, in camera head of the present invention, preferably, has signal processing circuit, this signal processing circuit is processed, it is exported as having changed the view data after the shape taking the view data that obtains by imaging apparatus, be positioned at wide-angle side and focus under the state of maximum distance the formula that meets the following conditions (13A) at zoom lens:

0.7＜y ₀₇/(fw·tanω _07w)＜1.0 (13A)

Wherein, fw is the total system focal length at the zoom lens of wide-angle side,

Distance in effective camera watch region of imaging apparatus, from the center to the solstics is made as y ₁₀The time, according to following formula

y ₀₇＝0.7×y ₁₀

Define,

Change to from wide-angle side under the situation of telescope end at effective camera watch region,

y ₁₀Be the maximal value of energy value,

ω _07wBe to be y by the center image height that incides from the shooting face of wide-angle side ₀₇The chief ray of image position incident ray and the angle that forms of optical axis in object space.

Under the situation of this zoom lens of the present invention, be conceived to the correction of astigmatic correction and barrel-shaped distortion and become the tradeoff this point easily, allow to a certain extent to produce the distortion aberration, can utilize the image processing function that comprises in the camera head that uses zoom lens of the present invention to come the distortion of correcting image shape.Below describe this point in detail.

Here, suppose and make the imaging in the optical system of the aberration that do not distort of infinity object.In this case, because the not distortion of formed picture, thereby following formula

f＝y/tanω (A)

Set up.

Wherein, y is the height of picture point apart from optical axis,

F is the focal length of imaging system,

ω is connected to the angle of the corresponding object point direction of the picture point of position of y with respect to optical axis with center from shooting face.

On the other hand, allow during near only being in wide-angle side state to become following formula under the situation of the barrel-shaped distortion aberration in the optical system:

f＞y/tanω (B)

That is, if make ω and y become steady state value, then the focal distance f of wide-angle side can be elongated, correspondingly suppressed the design of aberration easily.

And the reason of utilizing plural lens to become to assign to constitute the lens combination that is equivalent to the object side lens combination usually is for correcting distorted aberration of while and astigmatism.In the present invention, do not need to do like this.Therefore, help proofreading and correct astigmatism.

Therefore, in camera head of the present invention, the view data that is obtained by imaging apparatus is processed by Flame Image Process.In this processing, change view data (picture shape) so that proofread and correct the barrel-shaped distortion aberration.The view data that like this, finally obtains becomes and has and the object view data of similar shape roughly.Therefore, as long as the image of object is outputed to CRT or printer according to this view data.

Carrying out such view data timing, effective camera watch region of wide-angle side becomes tubbiness.Then the view data of effective camera watch region of tubbiness is changed to the view data of rectangle.

Conditional (13A) has been stipulated the barrel-shaped distortion degree of zoom wide-angle side.By the formula of satisfying condition (13A), can reasonably carry out astigmatic correction.In addition, the picture that is deformed into tubbiness carries out opto-electronic conversion by imaging apparatus, forms the view data that is deformed into tubbiness.Yet the view data that is deformed into tubbiness is the electromachining that graphics processing unit implements to be equivalent to the change of shape of picture by the signal processing system of electronic image pickup device.Like this, even finally on display device, reproduced, distortion and the image roughly similar also can have been obtained to proofread and correct to the subject shape from the view data of graphics processing unit output.

Here, suppress generation by mode based on the distortion aberration of zoom lens with the lower limit 0.7 that is not less than conditional (13A), proofreaied and correct under the situation based on the pattern distortion of the distortion aberration of zoom lens utilizing signal processing circuit, suppress the extensibility of revised image periphery towards the radiation direction easily, the acutance that suppresses the image periphery easily worsens.

And, allow the distortion aberration of zoom lens by mode with the upper limit 1.0 that is not higher than conditional (13A), help proofreading and correct the astigmatism of zoom lens, help the slimming of zoom lens.

In addition, also can determine effective camera watch region of wide-angle side by the mode of complete correcting distorted aberration, yet consider the influence of distant view (perspective) and the image degradation of periphery, also can suitably keep about-3% or the barrel-shaped distortion aberration about-5% etc. carries out the change of view data.

Have at above-mentioned zoom lens under the situation of focus function, each above-mentioned conditional adopts the value of focusing under the state of maximum distance object.

And, preferably, satisfy a plurality of conditionals of above-mentioned each invention arbitrarily simultaneously.

And, more preferably, that each above-mentioned conditional change is as follows.

Preferably the lower limit of conditional (1A) is made as 2.8, more preferably is made as 2.75.

Preferably the higher limit of conditional (1A) is made as 25, more preferably is made as 20, more preferably be made as 5 again.

Preferably the lower limit of conditional (2A) is made as-1.75, more preferably is made as-1.7.

Preferably the higher limit of conditional (2A) is made as-0.8, more preferably is made as-1.1.

Preferably the lower limit of conditional (3A) is made as 6, more preferably is made as 7, more preferably be made as 9 again.

Preferably the higher limit of conditional (3A) is made as 460, more preferably is made as 440.

Preferably the lower limit of conditional (4A) is made as 2.39, more preferably is made as 2.40.

Preferably the higher limit of conditional (4A) is made as 25, more preferably is made as 20.

Preferably the lower limit of conditional (5A) is made as-1.2, more preferably is made as-1.17.

Preferably the higher limit of conditional (5A) is made as-0.5, more preferably is made as-0.8.

Preferably the lower limit of conditional (6A) is made as-4, more preferably is made as-3.

Preferably the higher limit of conditional (6A) is made as-0.21, more preferably is made as-0.22, more preferably be made as-1.0 ,-2.0 again.

Preferably the lower limit of conditional (7A) is made as 0.9, more preferably is made as 1.01.

Preferably the higher limit of conditional (7A) is made as 1.4, more preferably is made as 1.3.

Preferably the lower limit of conditional (8A) is made as-0.6, more preferably is made as-0.4.

Preferably the higher limit of conditional (8A) is made as 0.6, more preferably is made as 0.4.

Preferably the lower limit of conditional (9A) is made as 15.5, more preferably is made as 16.

Preferably the higher limit of conditional (9A) is made as 34, more preferably is made as 33.

Preferably the lower limit of conditional (10A) is made as 15, more preferably is made as 18.

Preferably the higher limit of conditional (10A) is made as 68, more preferably is made as 66.

Preferably the lower limit of conditional (11A) is made as 4.5, more preferably is made as 5.

Preferably conditional (11A) is provided with the upper limit, makes not reach more than 10, can suppress the miniaturization and the aberration change of length overall.

Preferably the lower limit of conditional (12A) is made as-0.7, more preferably is made as-0.5 ,-0.3.

Preferably the higher limit of conditional (12A) is made as 0.7, more preferably is made as 0.5.

Preferably the lower limit of conditional (13A) is made as 0.75, more preferably is made as 0.8.

Preferably the higher limit of conditional (13A) is made as 0.99, more preferably is made as 0.98.

And zoom lens can be 4 set vari-focus lens.By reducing the lens combination number, the miniaturization that helps when being accommodated in zoom lens in the apparatus main body etc.

And, can the 4th lens combination dispose the 5th lens combination as side, the 5th lens combination has aspheric surface, and when zoom and when action focusing, stationkeeping.In the 5th lens combination, when zoom or when action focusing, the change in location of the outer chief ray of axle.Preferably, utilize this point to come aspheric surface to be set in the mode of the aberration change of the 5th lens combination when reducing or during the focusing action at zoom.The 5th lens combination can be a positive light coke, also can be negative power.

And preferably, the 5th lens combination is 1 piece of lens, and these lens have the positive light coke littler than the positive light coke of the 4th lens combination, and concave surface is towards object side.When having aberration correction, help the miniaturization of the 5th lens combination.

In order to solve above-mentioned problem, zoom lens of the present invention from object side to having successively as side: the 1st lens combination with positive light coke; The 2nd lens combination with negative power; The 3rd lens combination with positive light coke; And the 4th lens combination with positive light coke, this zoom lens has the brightness diaphragm, this brightness diaphragm is compared with described the 2nd lens combination to be configured in to compare as side and with the most close lens face as side in described the 3rd lens combination and is configured in object side, from wide-angle side during to the zoom of telescope end, it is big that interval between described the 1st lens combination and described the 2nd lens combination becomes, interval between described the 2nd lens combination and described the 3rd lens combination dwindles, and the interval between described the 3rd lens combination and described the 4th lens combination changes.

This comprise positive and negative, just, the zoom lens of the type of positive lens combination configuration helps guaranteeing zoom ratio.And, make emergent pupil away from image planes easily, under the situation of using the electro-photographic element, help guaranteeing good image.

And,, help the pathization of the 3rd lens combination by the brightness diaphragm is configured in above-mentioned position.The height of the light of present dynasty's the 3rd lens combination incident hour also helps aberration correction.

Then, in zoom lens of the present invention, and the 1st lens combination adopts by negative lens and these 2 pieces of structures that lens constitute of positive lens.Thus, in thickness direction that helps the 1st lens combination and miniaturization radially, make between each lens and to eliminate aberration and help proofreading and correct each aberration in the 1st lens combination, be suppressed at the aberration change when having carried out wide field's angling and high zoom ratios easily.

And the 2nd lens combination has negative meniscus lens composition at the most close object side place, and this negative meniscus lens composition has convex surface and has concave surface as side at object side.And the 3rd lens combination is made of positive lens and these 2 pieces of lens of negative lens successively from object side.In addition, the lens composition is defined as the phacoid that the plane of refraction that contacts with air only is object side plane of refraction and these 2 faces of picture side plane of refraction on optical axis.

Miniaturization when carrying out retraction, it is effective reducing a lens piece number.In zoom lens of the present invention, adopt said structure by making the 3rd lens combination, help the miniaturization of the 3rd lens combination, rely on the 2nd lens combination side by the principal point that makes the 3rd lens combination, help guaranteeing zoom ratio.

And, when making the 2nd lens combination guarantee sufficient negative power, suppress to follow the generation of the off-axis aberration due to wide field's angling, making the lens composition of the most close object side in the lens composition in the 2nd lens combination is above-mentioned negative meniscus lens composition.Thus, when having carried out wide field's angling, be suppressed near the incident angle that incides the off-axis ray of this negative lens composition the wide-angle side easily, help reducing off-axis aberration.

Then, by making the 4th lens combination constitute the miniaturization when more helping retraction by 1 positive lens composition.

In foregoing invention, more preferably satisfy simultaneously in following structure and the conditional any or a plurality of.

Preferably, with respect to wide-angle side, at telescope end, the 1st lens combination is positioned at object side.

Thus, guarantee the zoom function of the 2nd lens combination easily.

Preferably, negative lens in the 1st lens combination is positioned at object side than the positive lens in the 1st lens combination, negative lens in the 1st lens combination has the picture side, this has the absolute value of the paraxial radius-of-curvature littler than the absolute value of the paraxial radius-of-curvature of object side as the side, positive lens in the 1st lens combination has the picture side, and this has the absolute value of the paraxial radius-of-curvature bigger than the absolute value of the paraxial radius-of-curvature of object side as the side.

When suppressing the thickness of the 1st lens combination on optical axis, help carrying out aberration and reduce.And more preferably, negative lens in the 1st lens combination and positive lens all are the meniscus shaped lenses that has convex surface at object side.

Can reduce the incident angle of the off-axis ray on each lens face near the 1st lens combination wide-angle side, help reducing the aberration when wide field's angling.

More preferably, in order to reduce the relative eccentric of positive lens and negative lens, this positive lens and negative lens are engaged.

Preferably, the 2nd lens combination has and compares positive lens and the negative lens that is configured in the picture side with negative meniscus lens composition.

In the aberration that reduces by the 2nd lens combination, fully guarantee negative power easily, help wide field's angling.And, by guaranteeing the focal power of the 2nd lens combination, suppress the zoom burden of the 3rd lens combination easily, the aberration change when helping reducing zoom.

More preferably, in order to carry out miniaturization, the 2nd lens combination adopts the structure that is made of negative meniscus lens composition and described negative lens and positive lens.

And more preferably, the 2nd lens combination is compared by negative meniscus lens composition and with this negative meniscus lens composition to be configured in as side and rear side lens group with positive light coke and is constituted, and the rear side lens group has described positive lens and negative lens.

Can make the principal point of the 2nd lens combination rely on object side, help the 2nd lens combination in radially miniaturization.That is, help reducing size when having carried out wide field's angling.

And near wide-angle side, the synthesis system of the 1st lens combination and the 2nd lens combination has the balanced configuration of positive light coke (the 1st lens combination), negative power (negative meniscus lens composition), positive light coke (rear side lens group).On the other hand, near telescope end, the synthesis system of the 2nd lens combination and the 3rd lens combination has the balanced configuration of negative power (negative meniscus lens composition), positive light coke (rear side lens group), positive light coke (positive lens in the 3rd lens combination), negative power (negative lens in the 3rd lens combination).

Like this, all be in the good symmetrical beam power configuration of aberration correction degree near the wide-angle side and near the telescope end.

Near wide-angle side, in the synthesis system of the 1st lens combination and the 2nd lens combination, the Po Zi that cancels out each other cut down and, coma and ratio chromatism,, help guaranteeing field angle and guarantee performance.And, near telescope end, in the synthesis system of the 2nd lens combination and the 3rd lens combination, the Po Zi that cancels out each other cut down and, coma and ratio chromatism,, help guaranteeing the optical property when having carried out high zoom ratios.

And preferably, the 2nd lens combination has negative lens, this negative lens be configured in negative meniscus lens composition as side and have aspheric surface.

Use aspheric surface by the lens face that makes this negative lens, on obtaining axle, in the balance of aberration and off-axis aberration, suppress the thickness of the 2nd lens combination easily, help guaranteeing wide field's angling and zoom ratio.

And preferably, the described negative lens in the 2nd lens combination is the aspheric surface plastic lens.

By 2 negative lenses of configuration in the 2nd lens combination, in the balance that obtains aberration and off-axis aberration on the axle with negative meniscus lens composition, help guaranteeing the negative power of the 2nd lens combination.

And, because the negative lens in the group of back has aspheric surface, thereby in the thickness that suppresses the 2nd lens combination, more help proofreading and correct near the off-axis aberration wide-angle side.Adopt plastics by the material that makes non-spherical lens, make non-spherical lens easily.

Preferably, with respect to wide-angle side, at telescope end, the 3rd lens combination is positioned at object side.

Thus, guarantee the zoom function of the 3rd lens combination easily.

At this moment, preferably, brightness diaphragm and the 3rd lens combination move integratedly.

Because than wide-angle side, at telescope end, the brightness diaphragm moves to object side, thereby guarantees the moving range of the 3rd lens combination easily.And because at wide-angle side and telescope end, the brightness diaphragm thereby helps the pathization and the slimming of the 3rd lens combination all near the 3rd lens combination.

Preferably, the positive lens in the 3rd lens combination is the biconvex shape, and negative lens is that the object side is convex surface and is the meniscus shape of concave surface as the side.

Make the principal point of the 3rd lens combination be positioned at object side easily, make 2nd lens combination of the principal point of the 3rd lens combination at telescope end easily, help guaranteeing zoom ratio near negative power.And because the convex surface of the object side of two convex surfaces of positive lens and negative lens composition is provided with continuously along optical axis, thereby the axle that convergence is dispersed from the 2nd lens combination goes up light beam, more helps the 3rd lens combination in radially miniaturization.And, make the concave surface of negative lens have such function easily: to eliminate aberration in each convex surface generation of the 3rd lens combination, perhaps make an outer light beam towards direction refraction, guarantee light height, make zoom lens good towards the disposition far away of picture side to the 4th lens combination incident away from optical axis.

Preferably, the object side of the positive lens in the 3rd lens combination and all be aspheric surface as the side.

Help correction of spherical as side and coma,, also help guaranteeing optical property even piece number of the lens in the 3rd lens combination is 2 pieces.

Preferably, the negative lens in the 3rd lens combination is aspheric surface as the side.

By making the most close face as the side in the 3rd lens combination is aspheric surface, can make off-axis aberration good.

Preferably, the 4th lens combination moves to object side, carries out from remote thing to the closely focusing of thing.

Because the 4th lens combination is carried out lightweight easily and reduced the light sensitivity of focusing easily, thereby by this lens combination is moved, can guarantee the precision of focusing when focusing, be preferred.

And,, thereby can reduce positive light coke as long as because the 4th lens combination can mainly play the function of adjusting emergent pupil.Therefore, adopt the structure of 1 piece of positive lens, help miniaturization and cost degradation by making the 4th lens combination.

At this moment, by making this positive lens, help proofreading and correct off-axis aberration for having aspheric meniscus shaped lens.Particularly, be to be effective under the situation of the most close lens combination as side in the 4th lens combination.

And,, thereby help miniaturization because the lens combination that comprises in the zoom lens only is these 4 of the 1st lens combination, the 2nd lens combination, the 3rd lens combination and the 4th lens combination.

Perhaps, can have the 5th lens combination, the 5th lens combination be configured in the 4th lens combination as side and have the plane of refraction of curved surface.Help proofreading and correct curvature of the image or guarantee disposition far away.

And the 5th lens combination makes physical construction simple fixing during to the zoom of telescope end from wide-angle side easily.

And the lens combination that comprises in the zoom lens only is these 5 of the 1st lens combination, the 2nd lens combination, the 3rd lens combination, the 4th lens combination and the 5th lens combination, helps miniaturization.

In the zoom lens of above-mentioned each invention, preferred value conditions is shown below.

Preferably, the 1st lens combination formula (1B) that meets the following conditions:

-3＜(R _1f+R _1r)/(R _1f-R _1r)＜-1 (1B)

Wherein, R _1fBe the most paraxial radius-of-curvature of the lens face of close object side of described the 1st lens combination,

R _1rIt is the paraxial radius-of-curvature of lens face of the most close picture side of described the 1st lens combination.

Conditional (1B) is determined the preferable shape of the 1st lens combination.By being not less than the lower limit of conditional (1B), and be not higher than the upper limit of conditional (1B), suppress to follow curvature of the image excessive or not enough of wide field's angling easily.And, help proofreading and correct the ratio chromatism, of telescope end.

Preferably, the formula (2B) that meets the following conditions of the negative meniscus lens composition in the 2nd lens combination:

1＜(R _2nf+R _2nr)/(R _2nf-R _2nr)＜1.4 (2B)

Wherein, R _2nfBe the paraxial radius-of-curvature of the object side of the negative meniscus lens composition in the 2nd lens combination,

R _2nrIt is the paraxial radius-of-curvature of the picture side of the negative meniscus lens composition in the 2nd lens combination.

Conditional (2B) is determined the preferable shape of the negative meniscus lens composition of close object side of the 2nd lens combination.By not being higher than the upper limit of conditional (2B), making the object side is convex surface, thereby is suppressed near the incident angle of the axle outer light beam that incides this negative meniscus lens composition the wide-angle side easily, helps proofreading and correct the aberration of wide-angle side.By being not less than the lower limit of conditional (2B), suppress the curvature of the picture side of negative meniscus lens composition, help proofreading and correct near the spherical aberration telescope end.

Preferably, the formula (3B) that meets the following conditions of the negative meniscus lens composition in the 1st lens combination and the 2nd lens combination:

-0.3＜f _2n/f ₁＜-0.13 (3B)

Wherein, f _2nBe the focal length of the negative meniscus lens in the 2nd lens combination,

f ₁It is the focal length of the 1st lens combination.

Conditional (3B) is determined the preferred light focal power ratio of the negative meniscus lens composition in the 1st lens combination and the 2nd lens combination.By being not less than the lower limit of conditional (3B), can fully guarantee the negative power of the synthesis system of the 1st lens combination and negative meniscus lens, help guaranteeing simultaneously miniaturization and field angle.By not being higher than the upper limit of conditional (3B), guaranteeing the positive light coke of the 1st lens combination, thereby help proofreading and correct curvature of the image.

Preferably, the formula (4B) that meets the following conditions of the negative lens in the 3rd lens combination:

1＜(R _3nf+R _3nr)/(R _3nf-R _3nr)＜6 (4B)

Wherein, R _3nfBe the paraxial radius-of-curvature of the object side of the negative lens in the 3rd lens combination,

R _3nrIt is the paraxial radius-of-curvature of the picture side of the negative lens in the 3rd lens combination.

Conditional (4B) is determined the preferable shape of the negative lens in the 3rd lens combination.By being not less than the lower limit of conditional (4B), the object side that makes negative lens is a positive light coke, and the effect that can guarantee to make the principal point of the 3rd lens combination to rely on the effect of object and share the positive light coke of the 3rd lens combination helps miniaturization and high zoom ratiosization.And, guarantee as the negative power of side easily and eliminate aberration in the 3rd lens combination.And,, avoid the negative power as the side of negative lens excessively to strengthen, thereby suppress coma and astigmatism easily by not being higher than the upper limit of conditional (4B).

Preferably, the formula (5B) that meets the following conditions of the negative lens in the 3rd lens combination:

15＜v _3n＜35 (5B)

Wherein, v _3nIt is the Abbe number of the negative lens in the 3rd lens combination.

Conditional (5B) is determined the preferred Abbe number of the material of the negative lens in the 3rd lens combination.By being not less than the lower limit of conditional (5B), suppress the unusual dispersed increase of the material of negative lens easily, suppress the surplus of chromatic aberration correction easily.And, by not being higher than the upper limit of conditional (5B), guarantee the dispersion of negative lens, thereby help proofreading and correct the aberration in the 3rd lens combination.

Preferably, positive lens in the 3rd lens combination and the negative lens formula (6B) that meets the following conditions:

5＜v _3p-v _3n＜70 (6B)

Wherein, v _3pBe the Abbe number of the positive lens in the 3rd lens combination,

v _3nIt is the Abbe number of the negative lens in the 3rd lens combination.

Conditional (6B) determines that the preferred Abbe number of positive lens in the 3rd lens combination and negative lens is poor.By being not less than the lower limit of conditional (6B), guarantee that the Abbe number of 2 kinds of lens is poor, thereby suppress the generation of the aberration in the 3rd lens combination easily, suppress the generation of the aberration in total zoom area easily.And,, guarantee the cost degradation of the lens material that will use and the easness of lens processing easily by not being higher than the upper limit of conditional (6B).

Preferably, the zoom lens formula (7B) that meets the following conditions:

4＜ft/fw (7B)

Ft is the focal length of the zoom lens total system of telescope end.

Conditional (7B) is determined the preferred zoom ratio of zoom lens total system.By being not less than the lower limit of conditional (7B), guarantee zoom ratio, thereby can tackle various photography scenes, be preferred.

And the camera head that the present invention relates to has: zoom lens; And imaging apparatus, it has the shooting face of the picture side that is configured in zoom lens, and will convert electric signal to by the optical image on the formed shooting face of zoom lens, and zoom lens is above-mentioned arbitrary zoom lens.

And, preferably, this camera head has signal processing circuit, this signal processing circuit is processed taking acquired image data by imaging apparatus, and as the view data after the change of shape is exported, carried out under the state of focusing the formula that meets the following conditions (8B) at this zoom lens in wide-angle side and maximum distance:

0.7＜y ₀₇/(fw·tanω _07w)＜0.99 (8B)

When the distance in the effective shooting face at imaging apparatus, from the center to the solstics is made as y ₁₀The time, be defined as:

y ₀₇＝0.7×y ₁₀

Be changed under the situation of telescope end y from wide-angle side at effective camera watch region ₁₀Be the maximal value of energy value, ω _07wBe to be y by the center image height that incides from the shooting face of wide-angle side ₀₇The chief ray of image position incident ray and the angle that forms of optical axis in object space.

Here, suppose and make the imaging in the optical system of the aberration that do not distort of infinity object.In this case, because the not distortion of the picture of imaging, thereby following formula

f＝y/tanω (A)

Set up.

Wherein, y is the height of picture point apart from optical axis, and f is the focal length of imaging system, and ω is connected to the angle of the corresponding object point direction of the picture point of position of y with respect to optical axis with center from shooting face.

f＞y/tanω (B)

That is, if make ω and y become steady state value, then the focal distance f of wide-angle side can be elongated, correspondingly suppressed the design of aberration (particularly astigmatism) easily.

Under the situation of carrying out such view data correction, effective camera watch region of wide-angle side becomes tubbiness.And, the view data of effective camera watch region of tubbiness is changed to the view data of essentially rectangular.

Conditional (8B) has been stipulated the barrel-shaped distortion degree in wide-angle side.By the formula of satisfying condition (8), can reasonably carry out astigmatic correction.In addition, the picture that is deformed into tubbiness carries out opto-electronic conversion by imaging apparatus, becomes the view data that is deformed into tubbiness.Yet the view data that is deformed into tubbiness is the electromachining that graphics processing unit implements to be equivalent to the change of shape of picture by the signal processing system of electronic image pickup device.Like this, even finally on display device, reproduced, distortion and the image roughly similar also can have been obtained to proofread and correct to the subject shape from the view data of graphics processing unit output.

Here, suppress generation by mode based on the distortion aberration of zoom lens with the lower limit that is not less than conditional (8B), proofreaied and correct under the situation based on the pattern distortion of the distortion aberration of zoom lens utilizing signal processing circuit, suppress the extensibility of revised image periphery towards the radiation direction easily, the acutance that suppresses the image periphery easily worsens.

And, by not being higher than the upper limit of conditional (8B), allow the distortion aberration of zoom lens, thereby help proofreading and correct the astigmatism of zoom lens, help the slimming of zoom lens.

And,, just can proofread and correct ratio chromatism, as long as press the correcting value that each chrominance signal (for example R (red), G (green), B (indigo plant)) is adjusted the distortion aberration.

Have at above-mentioned zoom lens under the situation of focus function, each above-mentioned structure adopts the value of focusing under the state of maximum distance object.

And, preferably, above-mentioned each condition by following change, can be obtained this effect more reliably.

Preferably the lower limit of conditional (1B) is made as-2, more preferably is made as-1.7.And, preferably the higher limit of conditional (1B) is made as-1.1 ,-1.2, more preferably be made as-1.3.

Preferably the lower limit of conditional (2B) is made as 1.05, more preferably is made as 1.1.And, preferably the higher limit of conditional (2B) is made as 1.3, more preferably be made as 1.2.

Preferably the lower limit of conditional (3B) is made as-0.25, more preferably is made as-0.22.And, preferably the higher limit of conditional (3B) is made as-0.15, more preferably be made as-0.17.

Preferably the lower limit of conditional (4B) is made as 1.5, more preferably is made as 2.And, preferably the higher limit of conditional (4B) is made as 5.5, more preferably be made as 5.

Preferably the lower limit of conditional (5B) is made as 15.5, more preferably is made as 16.And, preferably the higher limit of conditional (5B) is made as 30, more preferably be made as 25.

Preferably the lower limit of conditional (6B) is made as 15,40, more preferably is made as 55.And, preferably the higher limit of conditional (6B) is made as 68, more preferably be made as 66.

Preferably the lower limit of conditional (7B) is made as 5, more preferably is made as 6.And, preferably the higher limit of conditional (7B) is made as and is not more than 10, thereby can suppress the miniaturization and the aberration change of total length.

Preferably the lower limit of conditional (8B) is made as 0.7, more preferably is made as 0.75.And, preferably the higher limit of conditional (8B) is made as 0.98,0.95, more preferably be made as 0.92.

From the above description as can be seen, according to the present invention, can provide a kind of and help guaranteeing miniaturization, wide-angleization and zoom ratio, and keep the zoom lens of the image quality of photographs easily well.And, a kind of zoom lens that also suppresses manufacturing cost easily can be provided.And, a kind of camera head with such zoom lens can be provided.

Other purposes of the present invention and advantage, it partly will be conspicuous, and it partly will be understood from instructions.

Therefore, the present invention has architectural feature, elements combination and component configuration shown in the example in structure proposed below, and scope of the present invention will describe in claims.

Description of drawings

Fig. 1 is the wide-angle side (a) when infintie object point is focused, the intermediateness (b) of the embodiment 1 of zoom lens of the present invention, the lens profile figure of telescope end (c).

Fig. 2 is the figure identical with Fig. 1 of the embodiment 2 of zoom lens of the present invention.

Fig. 3 is the figure identical with Fig. 1 of the embodiment 3 of zoom lens of the present invention.

Fig. 4 is the figure identical with Fig. 1 of the embodiment 4 of zoom lens of the present invention.

Fig. 5 is the figure identical with Fig. 1 of the embodiment 5 of zoom lens of the present invention.

Fig. 6 is the aberration diagram when infintie object point is focused of embodiment 1.

Fig. 7 is the aberration diagram when infintie object point is focused of embodiment 2.

Fig. 8 is the aberration diagram when infintie object point is focused of embodiment 3.

Fig. 9 is the aberration diagram when infintie object point is focused of embodiment 4.

Figure 10 is the aberration diagram when infintie object point is focused of embodiment 5.

Figure 11 is the figure identical with Fig. 1 of the embodiment 6 of zoom lens of the present invention.

Figure 12 is the figure identical with Fig. 1 of the embodiment 7 of zoom lens of the present invention.

Figure 13 is the figure identical with Fig. 1 of the embodiment 8 of zoom lens of the present invention.

Figure 14 is the figure identical with Fig. 1 of the embodiment 9 of zoom lens of the present invention.

Figure 15 is the aberration diagram when infintie object point is focused of embodiment 6.

Figure 16 is the aberration diagram when infintie object point is focused of embodiment 7.

Figure 17 is the aberration diagram when infintie object point is focused of embodiment 8.

Figure 18 is the aberration diagram when infintie object point is focused of embodiment 9.

Figure 19 is the figure that the distortion aberration correction is shown.

Figure 20 is the place ahead stereographic map that the outward appearance of digital camera of the present invention is shown.

Figure 21 is the rear perspective view of the digital camera of Figure 20.

Figure 22 is the sectional view of the digital camera of Figure 20.

Figure 23 is the structured flowchart of internal circuit of major part of the digital camera of Figure 20.

Embodiment

Below, the embodiment 1～5 of zoom lens of the present invention is described.Fig. 1～Fig. 5 illustrates the wide-angle side (a) when infintie object point is focused, the intermediateness (b) of embodiment 1～5, the lens profile figure of telescope end (c) respectively.In each figure, the 1st lens combination is represented that by G1 the 2nd lens combination is represented by G2, aperture diaphragm is represented that by S the 3rd lens combination is represented that by G3 the 4th lens combination is represented by G4, the optics optical low-pass filter represented by F, represented by C that as the glass cover of the CCD of electro-photographic element the image planes of CCD are represented by I.In addition, about near infrared sharp cut-off coating, for example can directly implement coating, and also can dispose the IR-cut absorption filter separately optics optical low-pass filter F.

As shown in Figure 1, the zoom lens of embodiment 1 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, aperture diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

Below be illustrated in from the mobile status of wide-angle side when telescope end carries out zoom.

The 1st lens combination G1 moves towards object side from the wide-angle side to the telescope end.

The 2nd lens combination G2 is from the wide-angle side to the intermediateness, enlarge and the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in move to the image planes side, from middle state to telescope end, enlarge and the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in move to object side.At telescope end, compare with the wide-angle side position and to be positioned at object side.

Aperture diaphragm S and the 3rd lens combination G3 move towards object side from the wide-angle side to the telescope end integratedly.

The 4th lens combination G4 from the wide-angle side to the intermediateness, enlarge with the 3rd lens combination G3 between the interval in move to object side, from middle state to telescope end, in the interval between expansion and the 3rd lens combination G3 to some distances of image planes side shifting.At telescope end, compare with the wide-angle side position and to be positioned at object side.

The 1st lens combination G1 is made of towards the negative meniscus lens of object side and the joint lens of biconvex positive lens convex surface successively from object side.The 2nd lens combination G2 is made of group G2b after group G2f and the 2nd lens combination before the 2nd lens combination successively from object side, group G2f is made of the negative meniscus lens of convex surface towards object side before the 2nd lens combination, and group G2b is made of towards the positive meniscus shaped lens of object side double-concave negative lens and convex surface after the 2nd lens combination.The 3rd lens combination G3 is made of group G3b after group G3f and the 3rd lens combination before the 3rd lens combination successively from object side, and group G3f is made of the biconvex positive lens before the 3rd lens combination, and group G3b is made of the negative meniscus lens of convex surface towards object side after the 3rd lens combination.The 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

Aspheric surface is used for following 5 faces: the two sides of double-concave negative lens of group G2b after the 2nd lens combination, the two sides of the biconvex positive lens of group G3f before the 3rd lens combination, and the face of the image planes side of the negative meniscus lens of group G3b after the 3rd lens combination.

As shown in Figure 2, the zoom lens of embodiment 2 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, aperture diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The 4th lens combination G4 moves to object side in the interval between expansion and the 3rd lens combination G3 from the wide-angle side to the intermediateness, to telescope end, move to image planes side in the interval between expansion and the 3rd lens combination G3 from middle state.At telescope end, compare with the wide-angle side position and to be positioned at object side.

The 1st lens combination G1 is made of towards the joint lens of the positive meniscus shaped lens of object side the negative meniscus lens and the convex surface of convex surface towards object side successively from object side.The 2nd lens combination G2 is made of group G2b after group G2f and the 2nd lens combination before the 2nd lens combination successively from object side, group G2f is made of the negative meniscus lens of convex surface towards object side before the 2nd lens combination, and group G2b is made of towards the positive meniscus shaped lens of object side double-concave negative lens and convex surface after the 2nd lens combination.The 3rd lens combination G3 is made of group G3b after group G3f and the 3rd lens combination before the 3rd lens combination successively from object side, group G3f is made of the biconvex positive lens before the 3rd lens combination, and group G3b is made of towards the joint lens of the negative meniscus lens of object side the positive meniscus shaped lens and the convex surface of convex surface towards object side after the 3rd lens combination.The 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

Aspheric surface is used for following 6 faces: the two sides of the double-concave negative lens of group G2b after the 2nd lens combination, the two sides of the biconvex positive lens of group G3f before the 3rd lens combination, the face of the most close image planes side of the joint lens of group G3b after the 3rd lens combination, and the face of the object side of the positive meniscus shaped lens of the 4th lens combination G4.

As shown in Figure 3, the zoom lens of embodiment 3 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, aperture diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The 1st lens combination G1 is made of towards the joint lens of the positive meniscus shaped lens of object side the negative meniscus lens and the convex surface of convex surface towards object side successively from object side.The 2nd lens combination G2 is made of group G2b after group G2f and the 2nd lens combination before the 2nd lens combination successively from object side, group G2f is made of the negative meniscus lens of convex surface towards object side before the 2nd lens combination, and group G2b is made of towards the positive meniscus shaped lens of object side double-concave negative lens and convex surface after the 2nd lens combination.The 3rd lens combination G3 is made of group G3b after group G3f and the 3rd lens combination before the 3rd lens combination successively from object side, and group G3f is made of the biconvex positive lens before the 3rd lens combination, and group G3b is made of the negative meniscus lens of convex surface towards object side after the 3rd lens combination.The 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

Aspheric surface is used for following 6 faces: the two sides of the double-concave negative lens of group G2b after the 2nd lens combination, the two sides of the biconvex positive lens of group G3f before the 3rd lens combination, the face of the image planes side of the negative meniscus lens of group G3b after the 3rd lens combination, and the face of the object side of the positive meniscus shaped lens of the 4th lens combination G4.

As shown in Figure 4, the zoom lens of embodiment 4 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, aperture diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The 4th lens combination G4 from the wide-angle side to the intermediateness, dwindle and the 3rd lens combination G3 between the interval in move to object side, from middle state to telescope end, enlarge and the 3rd lens combination G3 between the interval in move to the image planes side.At telescope end, compare with the wide-angle side position and to be positioned at object side.

The 1st lens combination G1 is made of towards the joint lens of the positive meniscus shaped lens of object side the negative meniscus lens and the convex surface of convex surface towards object side successively from object side.The 2nd lens combination G2 is made of group G2b after group G2f and the 2nd lens combination before the 2nd lens combination successively from object side, group G2f is made of the negative meniscus lens of convex surface towards object side before the 2nd lens combination, and group G2b is made of towards the positive meniscus shaped lens of object side double-concave negative lens and convex surface after the 2nd lens combination.The 3rd lens combination G3 is made of group G3b after group G3f and the 3rd lens combination before the 3rd lens combination successively from object side, group G3f is made of the biconvex positive lens before the 3rd lens combination, and group G3b is made of biconvex positive lens, double-concave negative lens and the convex surface joint lens towards the positive meniscus shaped lens of object side after the 3rd lens combination.The 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

As shown in Figure 5, the zoom lens of embodiment 5 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, aperture diaphragm S, the 3rd lens combination G3 of positive light coke, the 4th lens combination G4 of positive light coke, and the 5th lens combination G5 of positive light coke.

The 5th lens combination G5 does not move.

The 1st lens combination G1 is made of towards the negative meniscus lens of object side and the joint lens of biconvex positive lens convex surface successively from object side.The 2nd lens combination G2 is made of group G2b after group G2f and the 2nd lens combination before the 2nd lens combination successively from object side, group G2f is made of the negative meniscus lens of convex surface towards object side before the 2nd lens combination, and group G2b is made of towards the positive meniscus shaped lens of object side double-concave negative lens and convex surface after the 2nd lens combination.The 3rd lens combination G3 is made of group G3b after group G3f and the 3rd lens combination before the 3rd lens combination successively from object side, and group G3f is made of the biconvex positive lens before the 3rd lens combination, and group G3b is made of the negative meniscus lens of convex surface towards object side after the 3rd lens combination.The 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.The 5th lens combination G5 is made of 1 piece of positive meniscus shaped lens of convex surface towards the image planes side.

Aspheric surface is used for following 7 faces: the two sides of the double-concave negative lens of group G2b after the 2nd lens combination, the two sides of the biconvex positive lens of group G3f before the 3rd lens combination, the face of the image planes side of the negative meniscus lens of group G3b after the 3rd lens combination, the face of the object side of the 4th lens combination G4, and the face of the object side of the 5th lens combination G5.

In addition, be positive optical axis and when y is made as direction with light shaft positive cross x being made as direct of travel with light, aspherical shape is expressed from the next:

x＝(y ²/r)/[1+{1-(K+1)(y/r) ²} ^1/2]

+A ₄y ⁴+A ₆y ⁶+A ₈y ⁸+A ₁₀y ¹⁰

Wherein, r is paraxial radius-of-curvature, and K is the circular cone coefficient, A ₄, A ₆, A ₈, A ₁₀It is respectively 4 times, 6 times, 8 times, 10 times asphericity coefficient.

Numerical value embodiment 1

The mm of unit

The face data

Face sequence number r d nd vd

1 20.184 0.90 1.84666 23.78

2 14.448 2.80 1.72916 54.68

3 1073.037 is variable

4 427.844 0.80 1.88300 40.76

5 4.572 2.24

6 (aspheric surface)-39.093 0.50 1.52542 55.78

7 (aspheric surfaces) 14.533 0.10

8 10.744 1.27 1.94595 17.98

9 48.064 is variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 4.104 2.18 1.49700 81.61

12 (aspheric surface)-13.761 0.10

13 6.192 1.22 2.10225 16.80

14 (aspheric surfaces) 3.854 are variable

15 10.500 1.80 1.52542 55.78

16 110.541 is variable

17 ∞ 0.50 1.54771 62.84

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝-60.536，A4＝-6.40505E-04，A6＝3.95672E-05，A8＝-1.36935E-06

The 7th

K＝0.000，A4＝-1.03560E-03，A6＝3.59861E-05，A8＝-2.60735E-06

The 11st

K＝-0.520，A4＝-4.04394E-04，A6＝-3.22695E-05

The 12nd

K＝0.000，A4＝-3.22817E-04，A6＝2.06984E-05

The 14th

K＝-0.840，A4＝3.45125E-03，A6＝1.54943E-04，A8＝1.54344E-05

The zoom data

Look in the distance in the middle of the wide-angle

Focal length 5.07 10.99 24.56

FNO. 3.30 4.15 5.81

Field angle 81.92 38.36 17.55

Image height 3.84 3.84 3.84

d3 0.30 5.14 9.87

d9 11.00 4.79 1.80

d14 5.28 6.71 15.08

d16 2.59 5.08 4.64

BF 4.25 6.74 6.29

Camera lens length overall 34.43 37.00 46.65

The variable focus lens package data

Group initial surface focal length

1 1 29.98

2 4 -6.17

3 11 8.90

4 15 21.95

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.07 10.99 24.56

FNO. 3.30 4.15 5.81

Field angle 74.34 38.36 17.55

Image height 3.42 3.82 3.82

Numerical value embodiment 2

The mm of unit

The face data

Face sequence number r d nd vd

1 20.667 0.80 1.92286 18.90

2 13.650 2.70 1.88300 40.76

3 108.221 is variable

4 41.801 0.50 1.88300 40.76

5 4.572 2.24

6 (aspheric surface)-17.515 0.60 1.52542 55.78

7 (aspheric surfaces) 22.203 0.10

8 11.240 1.24 1.94595 17.98

9 39.538 is variable

10 (diaphragm) ∞ 0.00

11 (aspheric surface) 4.024 1.52 1.49700 81.61

12 (aspheric surface)-42.083 0.10

13 5.941 1.26 1.51633 64.14

14 46272.511 1.16 1.90366 31.31

15 (aspheric surfaces) 5.093 are variable

16 (aspheric surfaces) 10.769 1.50 1.52542 55.78

17 94.150 is variable

18 ∞ 0.50 1.54771 62.84

19 ∞ 0.50

20 ∞ 0.50 1.51633 64.14

21 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝-0.241，A4＝3.40994E-04，A6＝-2.98980E-05

The 7th

K＝0.000，A4＝4.41548E-05，A6＝-4.31616E-05

The 11st

K＝-0.888，A4＝8.00164E-04，A6＝1.05486E-05

The 12nd

K＝0.000，A4＝-1.00264E-03，A6＝4.03978E-05

The 15th

K＝2.278，A4＝1.99710E-03，A6＝5.04698E-05

The 16th

K＝0.000，A4＝4.52537E-06，A6＝2.70564E-07

The zoom data

Look in the distance in the middle of the wide-angle

Focal length 5.00 12.70 33.80

FNO. 3.16 4.13 6.04

Field angle 80.26 33.21 12.73

Image height 3.84 3.84 3.84

d3 0.25 5.91 12.00

d9 12.00 4.25 1.40

d15 4.06 4.19 16.41

d17 3.27 7.27 4.04

BF 4.92 8.92 5.69

Camera lens length overall 35.39 37.43 49.65

The variable focus lens package data

Group initial surface focal length

1 1 29.18

2 4 -6.20

3 11 9.16

4 15 23.00

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.00 12.70 33.80

FNO. 3.16 4.13 6.04

Field angle 75.19 33.21 12.73

Image height 3.52 3.84 3.84

Numerical value embodiment 3

The mm of unit

The face data

Face sequence number r d nd vd

1 19.180 0.90 1.84666 23.78

2 11.930 3.17 1.80400 46.57

3 134.442 is variable

4 71.138 0.80 1.88300 40.76

5 4.506 2.35

6 (aspheric surface)-40.694 0.50 1.74320 49.34

7 (aspheric surfaces) 14.333 0.10

8 11.089 1.31 1.92286 18.90

9 143.834 is variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 3.950 1.87 1.49700 81.61

12 (aspheric surface)-14.607 0.10

13 6.677 1.50 2.10225 16.80

14 (aspheric surfaces) 3.941 are variable

15 (aspheric surfaces) 10.000 1.64 1.52542 55.78

16 98.516 is variable

17 ∞ 0.50 1.54771 62.84

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝93.493，A4＝-1.62861E-03，A6＝1.21652E-04，A8＝-3.51498E-06

The 7th

K＝0.000，A4＝-2.01098E-03，A6＝1.23307E-04，A8＝-4.96995E-06，A10＝1.81378E-08

The 11st

K＝-0.840，A4＝5.07059E-04，A6＝-2.84461E-05

The 12nd

K＝0.000，A4＝7.51952E-06，A6＝-2.48970E-05

The 14th

K＝-0.756，A4＝3.57507E-03，A6＝1.87747E-04，A8＝4.40623E-05

The 15th

K＝0.000，A4＝-3.33826E-05

The zoom data

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.86 34.24

FNO. 3.17 4.03 6.11

Field angle 81.11 33.00 12.59

Image height 3.84 3.84 3.84

d3 0.25 6.12 11.00

d9 10.80 3.76 0.60

d14 5.56 5.93 17.16

d16 2.00 5.63 4.28

BF 3.65 7.28 5.94

Camera lens length overall 34.20 37.04 48.65

The variable focus lens package data

Group initial surface focal length

1 1 28.39

2 4 -5.88

3 11 8.49

4 15 21.05

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.86 34.24

FNO. 3.17 4.03 6.11

Field angle 74.34 33.00 12.59

Image height 3.45 3.84 3.84

Numerical value embodiment 4

The mm of unit

The face data

Face sequence number r d nd vd

1 17.289 0.90 1.84666 23.78

2 10.848 3.34 1.78800 47.37

3 84.961 is variable

4 50.541 0.70 1.88300 40.76

5 4.432 2.75

6 (aspheric surface)-14.354 0.50 1.52542 55.78

7 (aspheric surfaces) 22.468 0.10

8 9.152 1.30 1.94595 17.98

9 21.000 is variable

10 (diaphragm) ∞ 0.00

11 (aspheric surface) 5.298 1.47 1.58313 59.38

12 (aspheric surface)-44.231 0.10

13 4.321 1.60 1.51633 64.14

14 -15.000 0.50 1.90366 31.31

15 3.500 1.11 1.68893 31.07

16 (aspheric surfaces) 6.162 are variable

17 (aspheric surfaces) 10.500 1.69 1.52542 55.78

18 75.647 is variable

19 ∞ 0.50 1.54771 62.84

20 ∞ 0.50

21 ∞ 0.50 1.51633 64.14

22 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝-18.466，A4＝1.55007E-04，A6＝-1.83466E-05

The 7th

K＝0.000，A4＝7.83716E-04，A6＝-4.73526E-05

The 11st

K＝-0.939，A4＝6.11342E-04，A6＝2.85705E-05

The 12nd

K＝0.000，A4＝-5.68675E-04，A6＝3.14012E-05

The 16th

K＝-0.686，A4＝5.57140E-03，A6＝1.49217E-0，A8＝3.11230E-05

The 17th

K＝0.000，A4＝2.41648E-05，A6＝1.36418E-07

The zoom data

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.88 34.27

FNO. 3.13 4.00 6.10

Field angle 81.34 32.61 12.54

Image height 3.84 3.84 3.84

d3 0.25 6.12 11.26

d9 10.75 4.11 1.70

d16 3.95 2.55 15.50

d18 2.32 6.98 3.50

BF 3.97 8.63 5.15

Camera lens length overall 34.96 37.44 49.65

The variable focus lens package data

Group initial surface focal length

1 1 28.25

2 4 -5.50

3 11 8.24

4 15 23.00

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.88 34.27

FNO. 3.13 4.00 6.10

Field angle 81.34 32.61 12.54

Image height 3.44 3.84 3.84

Numerical value embodiment 5

The mm of unit

The face data

Face sequence number r d nd vd

1 17.912 0.80 1.84666 23.78

2 12.037 2.98 1.77250 49.60

3 85.075 is variable

4 52.269 0.75 1.88300 40.76

5 4.500 2.41

6 (aspheric surface)-30.820 0.60 1.58313 59.38

7 (aspheric surfaces) 14.570 0.10

8 10.821 1.24 1.94595 17.98

9 42.997 is variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 4.174 1.89 1.49700 81.61

12 (aspheric surface)-12.814 0.10

13 6.462 1.35 2.10225 16.80

14 (aspheric surfaces) 3.994 are variable

15 (aspheric surfaces) 15.000 1.48 1.52542 55.78

16-60.061 is variable

17 (aspheric surface)-15.000 0.80 1.52542 55.78

18 -14.474 0.10

19 ∞ 0.30 1.51633 64.14

20 ∞ 0.50

21 ∞ 0.50 1.51633 64.14

22 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝7.548，A4＝-7.20453E-04，A6＝4.60250E-06

The 7th

K＝-19.224，A4＝-3.45511E-04，A6＝-1.38155E-05

The 11st

K＝-0.986，A4＝7.82686E-04，A6＝-9.16230E-05

The 12nd

K＝-4.094，A4＝1.33854E-04，A6＝-1.75238E-04，A8＝1.11412E-05

The 14th

K＝-0.696，A4＝2.85239E-03，A6＝2.68798E-04

The 15th

K＝0.000，A4＝4.22970E-05，A6＝-4.51175E-06

The 16th

K＝0.000，A4＝-5.73220E-04，A6＝2.60520E-05

The zoom data

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.86 34.09

FNO. 3.14 4.03 6.04

Field angle 81.51 32.86 12.55

Image height 3.84 3.84 3.84

d3 0.25 6.34 11.70

d9 11.22 3.94 0.70

d14 5.53 6.01 16.90

d16 1.96 5.69 4.59

BF 1.63 1.63 1.63

Camera lens length overall 34.79 37.82 49.73

The variable focus lens package data

Group initial surface focal length

1 1 30.33

2 4 -5.99

3 11 8.60

4 15 23.00

5 17 515.19

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.86 34.09

FNO. 3.14 4.03 6.04

Field angle 81.51 32.86 12.55

Image height 3.44 3.84 3.84

Fig. 6～Figure 10 illustrates the aberration diagram when infintie object point is focused of above embodiment 1～5 respectively.In these aberration diagrams, (a) the expression wide-angle side, (b) expression intermediateness, (c) expression telescope end, spherical aberration, astigmatism, distortion aberration, ratio chromatism.In each figure, " FIY " represents angle of half field-of view.

The value of conditional (1)～(13) in the various embodiments described above is shown below.

Conditional embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 5

(1) 3.837 3.221 2.593 2.995 3.005

(2) -1.426 -1.632 -1.569 -1.619 -1.579

(3) 10.123 25.600 26.584 434.769 26.498

(4) 3.259 2.991 2.415 3.018 2.818

(5) -1.034 -1.151 -1.082 -1.093 -1.109

(6) -2.341 -2.623 -2.203 -2.961 -2.505

(7) 1.022 1.242 1.135 1.192 1.188

(8) 0.233 0.077 0.258 -0.176 0.236

(9) 16.80 31.31 16.80 31.31 16.80

(10) 64.81 41.57 64.81 20.22 64.81

(11) 4.85 6.76 6.76 6.76 6.74

(12) 0.458 -0.118 0.479 -0.220 0.358

(13) 0.926 0.939 0.930 0.929 0.987

Shown below based on arbitrary embodiment of the present invention in, because each above-mentioned constitutive requirements are associated, thereby obtain such zoom lens: guarantee the zoom ratio about 7 times, has Wide-angle, it is few to constitute lens piece number, help the densification when retraction, and guarantee optical property easily.

Below, the embodiment 6～embodiment 10 of zoom lens of the present invention is described.Figure 11～Figure 14 illustrates the lens profile figure of embodiment 6～embodiment's 9 (a) wide-angle side when infintie object point is focused, (b) intermediateness, (c) telescope end respectively.In addition, embodiment 10 is identical with embodiment 5, thereby as shown in Figure 5.

In each figure, the 1st lens combination is represented by G1, the 2nd lens combination is represented by G2, the brightness diaphragm is represented by S, the 3rd lens combination is represented that by G3 the 4th lens combination is represented by G4, has infrared (IR) and is represented by F by the optics optical low-pass filter of coating, glass cover as the CCD of electro-photographic element is represented that by C the image planes of CCD are represented by I.In addition, about the IR-cut coating, for example can directly implement coating, and also can dispose the IR-cut absorption filter separately optics optical low-pass filter F.

Each embodiment all pulls out the 4th lens combination G4 and carries out from remote thing to the closely focusing of thing.

And the aperture size of brightness diaphragm S is fixed, and the object side of the 3rd lens combination G3 is that convex surface is inserted in the peristome of brightness diaphragm S.

And, the exposure adjustment during photography be by be right after the light quantity that moves as rear flank and the 3rd lens combination G3 one of the 3rd lens combination G3 adjust light filter (not shown) in light path insertion, disengaging and use mechanical shutter (not shown) to carry out.

And plastic lens is used for the 4th lens combination G4 in embodiment 6,7, is used for biconcave lens and the 4th lens combination G4 of the 2nd lens combination G2 in

embodiment

8,9, is used for the 4th lens combination G4 and the 5th lens combination G5 in embodiment 10.

As shown in Figure 6, the zoom lens of embodiment 6 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, brightness diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The 2nd lens combination G2 is from the wide-angle side to the intermediateness, enlarge with the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in towards looking like side shifting, from middle state to telescope end, enlarge and the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in move towards object side.At telescope end, compare with the wide-angle side position and to be positioned at object side.

The 3rd lens combination G3 and brightness diaphragm S from the wide-angle side to the telescope end, dwindle and the 2nd lens combination G2 between the interval, and enlarge and the 4th lens combination G4 between the interval in move towards object side.

The 4th lens combination G4 is from the wide-angle side to the intermediateness, enlarge with the 3rd lens combination G3 between the interval, and expansion and image planes I between the interval in move towards object side, from middle state to telescope end, enlarge with the 3rd lens combination G3 between the interval and dwindle and image planes I between the interval in towards looking like side shifting.At telescope end, compare with the wide-angle side position and to be positioned at object side.

From object side successively, the 1st lens combination G1 is made of towards the joint lens of the positive meniscus shaped lens of object side the negative meniscus lens and the convex surface of convex surface towards object side, the 2nd lens combination G2 is made of towards the positive meniscus shaped lens of object side negative meniscus lens, double-concave negative lens and the convex surface of convex surface towards object side, the 3rd lens combination G3 is made of brightness diaphragm S, biconvex positive lens and the convex surface negative meniscus lens towards object side, and the 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

Aspheric surface is used for following 6 faces: the two sides of the double-concave negative lens of the 2nd lens combination G2, the two sides of the biconvex positive lens of the 3rd lens combination G3, the face of the picture side of negative meniscus lens, and the face of the object side of the positive meniscus shaped lens of the 4th lens combination G4.

As shown in Figure 7, the zoom lens of embodiment 7 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, brightness diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

From object side successively, the 1st lens combination G1 is made of towards the joint lens of the positive meniscus shaped lens of object side the negative meniscus lens and the convex surface of convex surface towards object side, the 2nd lens combination G2 is made of towards the negative meniscus lens as side towards positive meniscus shaped lens and the convex surface as side negative meniscus lens, the convex surface of convex surface towards object side, the 3rd lens combination G3 is made of brightness diaphragm S, biconvex positive lens and the convex surface negative meniscus lens towards object side, and the 4th lens combination G4 is made of 1 piece of positive meniscus shaped lens of convex surface towards object side.

Aspheric surface is used for following 5 faces: the face of the picture side of the negative meniscus lens of the picture side of the 2nd lens combination G2, the two sides of the biconvex positive lens of the 3rd lens combination G3, the face of the picture side of negative meniscus lens, and the face of the picture side of the positive meniscus shaped lens of the 4th lens combination G4.

As shown in Figure 8, the zoom lens of embodiment 8 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, brightness diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The 2nd lens combination G2 is from the wide-angle side to the intermediateness, enlarge with the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in towards looking like side shifting, from middle state to telescope end, enlarge and the 1st lens combination G1 between the interval and dwindle and the 3rd lens combination G3 between the interval in move towards object side.At telescope end, compare with the position of wide-angle side and to be positioned at object side.

The 4th lens combination G4 is from the wide-angle side to the intermediateness, enlarge with the 3rd lens combination G3 between the interval, and expansion and image planes I between the interval in move towards object side, from middle state to telescope end, enlarge with the 3rd lens combination G3 between the interval and dwindle and image planes I between the interval in towards looking like side shifting.At telescope end, compare with the position of wide-angle side and to be positioned at object side.

Aspheric surface is used for following 5 faces: the face of the picture side of the double-concave negative lens of the 2nd lens combination G2, the two sides of the biconvex positive lens of the 3rd lens combination G3, the face of the picture side of negative meniscus lens, and the face of the picture side of the positive meniscus shaped lens of the 4th lens combination G4.

As shown in Figure 9, the zoom lens of embodiment 9 from object side successively by constituting with the lower part: the 1st lens combination G1 of positive light coke, the 2nd lens combination G2 of negative power, brightness diaphragm S, the 3rd lens combination G3 of positive light coke, and the 4th lens combination G4 of positive light coke.

The zoom lens of embodiment 10 is identical with embodiment 5.

The numeric data of the lens among each embodiment below is shown.

Numerical value embodiment 6

The mm of unit

The face data

Face sequence number r d nd vd

1 17.791 0.81 1.84666 23.78

2 12.005 3.08 1.77250 49.60

3 86.709 is variable

4 66.506 0.75 1.88300 40.76

5 4.480 2.46

6 (aspheric surface)-31.306 0.65 1.58313 59.38

7 (aspheric surfaces) 13.781 0.10

8 12.506 1.29 1.92286 18.90

9 315.181 is variable

10 (diaphragm) ∞-0.40

11 (aspheric surface) 4.358 2.44 1.49700 81.61

12 (aspheric surface)-12.005 0.10

13 7.191 1.31 2.10225 16.80

14 (aspheric surfaces) 4.388 are variable

15 (aspheric surface) 9.676 1.58 1.52542 55.78

16 45.813 is variable

17 ∞ 0.30 1.51633 64.14

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 6th

K＝0.000，A4＝-8.08347E-04，A6＝3.75656E-05，A8＝-8.70154E-07，A10＝-2.10000E-08

The 7th

K＝0.000，A4＝-1.28371E-03，A6＝4.25827E-05，A8＝-2.31366E-06

The 11st

K＝-0.740，A4＝3.67824E-04，A6＝-2.24188E-05，A8＝1.19854E-06

The 12nd

K＝-5.083，A4＝1.16962E-03，A6＝-2.27613E-04，A8＝1.88604E-05

The 14th

K＝-3.443，A4＝5.43899E-03，A6＝1.19187E-04

The 15th

K＝0.361，A4＝-1.48739E-04，A6＝3.33684E-06，A8＝-1.10231E-07，A10＝-3.35750E-10

Zoom data (under the constant situation of image height 3.83)

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.87 34.28

FNO. 3.11 4.03 6.05

Field angle 81.57 33.35 12.50

d3 0.30 6.25 11.70

d9 11.13 3.86 0.70

d14 5.45 6.59 18.30

d16 2.65 5.99 3.78

BF 4.19 7.54 5.35

Camera lens length overall 35.24 38.40 50.21

The variable focus lens package data

Group initial surface focal length

1 1 29.89

2 4 -6.08

3 11 8.95

4 15 23.00

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.87 34.28

FNO. 3.11 4.03 6.05

Field angle 75.77 33.35 12.50

Image height 3.51 3.83 3.83

Numerical value embodiment 7

The mm of unit

The face data

Face sequence number r d nd vd

1 18.084 0.81 1.84666 23.78

2 11.051 3.10 1.81600 46.62

3 75.670 is variable

4 57.210 0.75 1.81600 46.62

5 4.021 2.19

6 -59.513 1.21 1.93067 19.09

7 -10.809 0.37

8 -7.550 0.70 1.58313 59.38

9 (aspheric surface)-84.807 are variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 4.636 2.56 1.49700 81.61

12 (aspheric surface)-8.016 0.10

13 6.444 1.18 2.10225 16.80

14 (aspheric surfaces) 4.080 are variable

15 9.893 1.60 1.52542 55.78

16 (aspheric surfaces) 52.976 are variable

17 ∞ 0.30 1.51633 64.14

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 9th

K＝516.240，A4＝-9.02519E-04，A6＝-2.11145E-05

The 11st

K＝-3.042，A4＝2.08503E-03，A6＝-1.44832E-04

The 12nd

K＝1.146，A4＝9.60208E-04，A6＝-9.14080E-05

The 14th

K＝-0.544，A4＝1.26081E-03，A6＝1.76501E-04，A8＝5.49600E-07

The 16th

K＝0.000，A4＝6.63364E-05，A6＝-1.83062E-06

Zoom data (under the constant situation of image height 3.83)

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.84 34.18

FNO. 3.08 4.02 6.04

Field angle 81.97 33.35 12.57

d3 0.30 6.18 11.70

d9 8.93 2.97 0.60

d14 5.30 5.92 18.08

d16 2.60 6.44 3.80

BF 4.11 7.97 5.33

Camera lens length overall 32.90 37.31 49.98

The variable focus lens package data

Group initial surface focal length

1 1 29.12

2 4 -5.36

3 11 8.11

4 15 22.86

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.06 12.84 34.18

FNO. 3.08 4.02 6.04

Field angle 75.98 33.35 12.57

Image height 3.50 3.83 3.83

Numerical value embodiment 8

The mm of unit

The face data

Face sequence number r d nd vd

1 20.001 0.81 1.84666 23.78

2 12.364 3.07 1.81600 46.62

3 124.634 is variable

4 94.246 0.75 1.88300 40.76

5 4.500 2.36

6 -34.701 0.70 1.52542 55.78

7 (aspheric surfaces) 12.915 0.10

8 9.855 1.24 1.94595 17.98

9 31.445 is variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 4.101 2.21 1.49700 81.61

12 (aspheric surface)-10.543 0.30

13 9.216 1.34 2.00170 19.30

14 (aspheric surfaces) 4.773 are variable

15 9.600 1.59 1.52542 55.78

16 (aspheric surfaces) 44.033 are variable

17 ∞ 0.30 1.51633 64.14

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 7th

K＝0.095，A4＝-4.32632E-04，A6＝-2.55053E-06，A8＝-1.11152E-06

The 11st

K＝-1.078，A4＝1.00474E-03，A6＝-5.56504E-05

The 12nd

K＝0.000，A4＝1.45394E-03，A6＝-2.47470E-04，A8＝1.52715E-05

The 14th

K＝-1.142，A4＝2.30205E-03，A6＝3.35770E-04

The 16th

K＝0.000，A4＝1.16219E-04，A6＝-5.73103E-06，A8＝1.27697E-07

Zoom data (under the constant situation of image height 3.83)

Look in the distance in the middle of the wide-angle

Focal length 5.08 12.86 34.21

FNO. 3.10 4.05 6.04

Field angle 81.47 33.09 12.53

d3 0.30 6.22 11.70

d9 10.48 3.72 0.70

d14 5.36 6.57 17.85

d16 2.47 5.82 3.93

BF 4.00 7.35 5.46

Camera lens length overall 34.30 38.02 49.87

The variable focus lens package data

Group initial surface focal length

1 1 29.49

2 4 -5.89

3 11 8.62

4 15 23.00

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.08 12.86 34.21

FNO. 3.10 4.05 6.04

Field angle 75.69 33.09 12.53

Image height 3.51 3.83 3.83

Numerical value embodiment 9

The mm of unit

The face data

Face sequence number r d nd vd

1 19.436 0.81 1.84666 23.78

2 12.179 3.01 1.80400 46.57

3 120.343 is variable

4 91.118 0.75 1.88300 40.76

5 4.500 2.36

6 -22.299 0.70 1.52542 55.78

7 (aspheric surfaces) 16.643 0.10

8 11.204 1.24 1.94595 17.98

9 51.000 is variable

10 (diaphragm) ∞-0.30

11 (aspheric surface) 4.082 2.12 1.49700 81.61

12 (aspheric surface)-9.935 0.30

13 11.164 1.43 1.92287 20.80

14 (aspheric surfaces) 4.922 are variable

15 9.605 1.59 1.52542 55.78

16 (aspheric surfaces) 44.252 are variable

17 ∞ 0.30 1.51633 64.14

18 ∞ 0.50

19 ∞ 0.50 1.51633 64.14

20 ∞ 0.50

Image planes ∞

Aspherical surface data

The 7th

K＝2.468，A4＝-5.09398E-04，A6＝1.08408E-07，A8＝-1.20478E-06

The 11st

K＝-1.082，A4＝1.03781E-03，A6＝-5.80705E-05

The 12nd

K＝0.000，A4＝1.63732E-03，A6＝-2.60167E-04，A8＝1.54732E-05

The 14th

K＝-1.174，A4＝2.25831E-03，A6＝3.49404E-04

The 16th

K＝0.000，A4＝1.14861E-04，A6＝-5.05049E-06，A8＝1.15219E-07

Zoom data (under the constant situation of image height 3.83)

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.85 34.21

FNO. 3.12 4.06 6.04

Field angle 81.60 33.14 12.53

d3 0.30 6.21 11.68

d9 10.92 3.86 0.70

d14 5.36 6.60 17.86

d16 2.57 5.90 4.05

BF 4.10 7.43 5.58

Camera lens length overall 34.78 38.20 49.92

The variable focus lens package data

Group initial surface focal length

1 1 29.40

2 4 -6.00

3 11 8.83

4 15 22.99

Zoom data (the electric timing of distortion)

Look in the distance in the middle of the wide-angle

Focal length 5.07 12.85 34.21

FNO. 3.12 4.06 6.04

Field angle 75.87 33.14 12.53

Image height 3.51 3.83 3.83

In addition, numerical value embodiment 10 is identical with numerical value embodiment 5.

Figure 15～Figure 18 illustrates the aberration diagram when infintie object point is focused of above embodiment 6～9 respectively.In these aberration diagrams, (a) the expression wide-angle side, (b) expression intermediateness, (c) expression telescope end, spherical aberration SA, astigmatism AS, distortion aberration DT, ratio chromatism, CC.And FNO represents the F value, and ω represents angle of half field-of view.In addition, the aberration diagram of embodiment 10 is identical with embodiment 5.

Conditional value and conditional (1B)～(7B) and y in the various embodiments described above are shown below ₀₇, fw, ω _07wValue.

Conditional embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 5

(1B) -1.516 -1.628 -1.382 -1.385 -1.533

(2B) 1.144 1.151 1.1 1.104 1.188

(3B) -0.183 -0.183 -0.182 -0.183 -0.185

(4B) 4.131 4.453 3.149 2.577 4.235

(5B) 16.8 16.8 19.3 20.8 16.8

(6B) 64.81 64.81 62.31 60.81 64.81

(7B) 6.757 6.76 6.732 6.753 6.730

(8B) 0.983 0.930 0.929 0.927 0.935

y ₀₇ 2.43 2.55 2.55 2.55 2.68

fw 5.07 5.06 5.08 5.07 5.06

ω _07w 28.24 29.67 29.57 29.69 29.5

In each embodiment, can adopt following structure.

For unwanted light, can beyond brightness diaphragm S, dispose the hot spot diaphragm by ghost image, hot spot etc.Can be configured between object side, the 1st lens combination G1 and the 2nd lens combination G2 of the 1st lens combination G1, the arbitrary position between the 2nd lens combination G2 and the 3rd lens combination G3, between the 3rd lens combination G3 and the 4th lens combination G4, between the 4th lens combination G4 and the image planes I.And, can constitute and use members of frame to come also can constitute other parts by hot spot light.And, can directly be printed on the surface of lens, also can coating, also can paste sealant etc.And the Any shape such as scope that its shape can be circle, ellipse, rectangle, polygon, surrounded by function curve.And, not only can be by harmful light beam, and can be by the light beam of the comet hot spot of picture periphery etc.

And, can carry out the antireflection coating to each lens, alleviate ghost image and hot spot.Under the situation of overbrushing layer, owing to can alleviate ghost image and hot spot effectively, thereby expect.And, also can implement the IR-cut coating to lens face and glass cover etc.

And, being used to carry out the focusing of focal adjustments, the 4th lens combination G4 that is to use of expectation carries out.When using the 4th lens combination G4 to carry out focusing, because lens are in light weight, thereby the load that the drive system of motor etc. is applied is few.And, when focusing length overall do not change, can be at picture frame internal configurations driving motor, thereby help the densification of picture frame.As mentioned above, the 4th lens combination G4 that is to use of expectation focuses, yet can use the 1st lens combination G1, the 2nd lens combination G2, the 3rd lens combination G3 to focus.And, can move a plurality of lens combination and focus.And, can pull out lens combination integral body and focus, a part of lens that also can pull out or draw in the group are focused.

And, can alleviate the shade (shading) of the brightness of image periphery by the lenticule of mobile CCD.For example, can change the lenticular design of CCD at the incident angle of the light when each image height.And, the reduction that can come the correcting image periphery by Flame Image Process.

And, can in optical system, produce the distortion aberration wittingly, after photography, carry out electrical image and handle correcting distorted aberration.

The zoom lens of present embodiment produces the distortion aberration of tubbiness in wide-angle side on the photoelectric conversion surface of rectangle.On the other hand, near the middle focal length state or telescope end can suppress the to distort generation of aberration.For the correcting distorted aberration of electricity, effectively camera watch region can adopt barrel-shaped in wide-angle side, near the middle focal length state or telescope end adopt rectangular shape.Then, predefined effective camera watch region is carried out image transitions, convert the image information that has reduced the rectangle after the distortion to by Flame Image Process.Image height I in wide-angle side _MwImage height I less than the middle focal length state _MsOr at the image height I of telescope end _Mt

For example, as shown in figure 19, make the intersection point of optical axis and shooting face as the center and with the circumference of the radius R of the long limit inscribe of effective shooting face on the multiplying power of (image height) fix, the benchmark of this circumference as correction.Then, the each point of (image height) on the circumference of any radius r (ω) is in addition roughly moved along the radiation direction, moves with making premises concentric circles with the formation radius r ' (ω), thus proofread and correct.For example, in Figure 19, make any radius r of the inboard of the circle that is positioned at radius R ₁Some P on the circumference (ω) ₁Move to the radius r that proofread and correct at the center of Ying Chaoyuan ₁' some P on (ω) the circumference ₂And, make any radius r in the outside of the circle that is positioned at radius R ₂Some Q on the circumference (ω) ₁Moving to should be towards the radius r of proofreading and correct away from the direction at round center ₂' some Q on (ω) the circumference ₂Here, r ' (ω) can be expressed as follows.

r’(ω)＝αftanω (0≤α≤1)

Wherein, ω is the subject angle of half field-of view, and f is the focal length of imaging optical system (being zoom lens in the present invention).

Here, if a desirable image height corresponding with (image height) on the circle of described radius r is made as Y, then obtain

α＝R/Y＝R/ftanω

It is desirable to, optical system is with respect to optical axis rotation symmetry, and the aberration that promptly distorts also produces symmetrically with respect to the optical axis rotation.Therefore, as mentioned above, carry out at the distortion aberration that optics is produced under the situation of electricity correction, if can make on the reproduced image the intersection point of optical axis and shooting face as the center and with the radius of the long limit inscribe of effective shooting face be that the multiplying power of (image height) on the circumference of circle of R is fixed, the each point of (image height) on the circumference of radius r (ω) is in addition roughly moved along the radiation direction, move to become radius r with making premises concentric circles ' (ω), thereby proofread and correct, then think to be favourable aspect data volume and the operand.

Yet optical image no longer is continuous amount utilizing the captured time point of electro-photographic element (because sampling).Therefore, say strictly that as long as the pixel on the electro-photographic element is not to be radial arrangement, the fenestra of the above-mentioned radius R of then drawing no longer is round accurately on optical image.That is, in the shape correction of the view data of representing by each discrete coordinates point, there is not the circle that can make above-mentioned multiplying power fixing.Therefore, can adopt by each pixel (X _i, Y _j) determine mobile destination coordinate (X ' _i, Y ' _j) method.In addition, at (the X that has more than 2 _i, Y _j) move to coordinate (X ' _i, Y ' _j) situation under, get the mean value of the value that each pixel has.And, under the situation that does not have to move the point come, can use on every side the coordinate of several pixels (X ' _i, Y ' _j) value carry out interpolation.

Particularly in having the electronic image pickup device of zoom lens, because foozle of optical system and electro-photographic element etc. and obvious with respect to optical axis distortion, circle at the above-mentioned radius R of drawing on the described optical image is under the asymmetrical situation, and it is effective utilizing this method to proofread and correct.And, the situation etc. that in imaging apparatus or various output unit, signal reproduction is produced geometric distortion etc. during for image down, it is effective utilizing this method to proofread and correct.

In electronic image pickup device of the present invention, for calculation correction amount r ' (ω)-r (ω), also can constitute and write down r (ω) in being built in the recording medium of electronic image pickup device is relation between angle of half field-of view and the image height or the relation between actual image height r and desirable image height the r '/α.

In addition, can not appear at the extreme not enough situation of two ends light quantity of short side direction in order to make image behind the distortion correction, preferably, the described radius R formula that meets the following conditions:

0≤R≤0.6L _s

Wherein, L _sBe the length of the minor face of the face of effectively making a video recording.

Preferably, the described radius R formula that meets the following conditions:

0.3L _s≤R≤0.6L _s

And it is best making described radius R roughly consistent with the inscribe radius of a circle of the short side direction of effective shooting face.In addition, carrying out near radius R=0, promptly near on the axle, making under the situation of the fixing correction of multiplying power,, can guarantee the effect of wide-angleization and miniaturization though there are some unfavorable factors aspect the actual pixels number.

In addition, the focal length interval about needs are proofreaied and correct is divided into several focus areas.Then, near the telescope end in the focus area after this is cut apart, can utilize and can obtain the formula that roughly meets the following conditions

r’(ω)＝αftanω

Correction result's the identical correcting value of situation proofread and correct.But, in this case, will cause wide-angle side in the focus area after cutting apart also to keep to a certain degree barrel-shaped distortion amount.And,, then need in recording medium, preserve redundantly and proofread and correct needed inherent data, so be not optimal way if increase the cut zone number.Therefore, calculate in advance with cut apart after focus area in one or more coefficients of being associated of each focal length.This coefficient can be determined according to the mensuration of simulation or physical device.Then, also can near the telescope end in the described divided area, calculate and to obtain the formula that roughly meets the following conditions

r’(ω)＝αftanω

Correction result's the correcting value of situation, without exception this correcting value be multiply by described coefficient at each focal length and is used as final correcting value.

Yet, not having in the picture that obtains making the infinity object image-forming under the situation of distortion, following formula is set up:

f＝y/tanω

Wherein, y is the height (image height) of picture point apart from optical axis, f is the focal length of imaging system (being zoom lens in the present invention), and ω is connected to the angle (subject angle of half field-of view) of the corresponding object point direction of the picture point of position of y with respect to optical axis with center from shooting face.

Have in imaging system under the situation of barrel-shaped distortion aberration, following formula is set up:

f＞y/tanω

That is, if make the focal distance f of imaging system and image height y certain, then the value of ω increases.

And, preferably having image transitions portion, this image transitions portion will the electrical signal conversion by the captured image of zoom lens becomes by Flame Image Process has proofreaied and correct picture signal after the colo(u)r bias that is caused by ratio chromatism.By the ratio chromatism, of electronic calibration zoom lens, can obtain more preferable image.

Generally, in Electrofax, the picture of subject is resolved into the three primary colors picture of the 1st primary colors, the 2nd primary colors, the 3rd primary colors, by computing output signal is separately overlapped, thereby reproduce coloured image.Have at zoom lens under the situation of ratio chromatism,, when the picture with the light of the 1st primary colors is a benchmark when considering, the position of the picture imaging of position deviation the 1st primary colors of the picture imaging of the light of the 2nd primary colors and the 3rd primary colors.For the ratio chromatism, of electronic calibration image,, obtain the 2nd primary colors and the 3rd primary colors departure in advance to the photoimaging position of the 1st primary colors at each pixel of imaging apparatus according to the aberration information of zoom lens.Then, as long as at each pixel of photographs, carry out coordinate transform in the mode of proofreading and correct with the departure of the 1st primary colors and get final product.

For example, the image that is made of red (R), green (G), blue (B) this trichromatic output signal is described, obtain R and the B image space deviation to G at each pixel, as long as the coordinate conversion of carrying out photographs makes not the deviation with G, afterwards the signal of output R and B.

Though ratio chromatism, changes according to zoom, focusing, f-number, can be at each lens position (zoom, focusing, f-number), the departure of the 2nd primary colors and the 3rd primary colors and the 1st primary colors is stored in the storage holding device as correction data.By according to zoom position, with reference to this correction data, exportable 2nd and 3rd primary signal of the 2nd and the 3rd primary colors after of having proofreaied and correct to the deviation of the 1st primary signal.

Figure 20～Figure 22 represents pack into the concept map of structure of the digital camera of the present invention in the photographic optical system 41 of above-described zoom lens.Figure 20 is the place ahead stereographic map that the outward appearance of digital camera 40 is shown, and Figure 21 is the rear front view of described digital camera, and Figure 22 is the schematic cross sectional view that the structure of digital camera 40 is shown.Wherein, when the 41 not retractions of photographic optical system shown in Figure 20 and Figure 22.Under the situation of this example, digital camera 40 comprises: be positioned at the photographic optical system 41 of photographing with on the light path 42, be positioned at the finder optical system 43 on the view finder usefulness light path 44, shutter release button 45, flashlamp 46, LCD monitor 47, focal length change button 61 is set alternation switch 62 etc., when the retraction of photographic optical system 41, cover 60 slips by making, photographic optical system 41, finder optical system 43 and flashlamp 46 are covered by this lid 60.Then, cover 60 when camera 40 is set at photography state opening, photographic optical system 41 is in the non-retraction state of Figure 22, when having pushed the shutter release button 45 on the top that is configured in camera 40, with this action interlock, by photographic optical system 41, for example the zoom lens of embodiment 1 is photographed.On the shooting face (photoelectric conversion surface) that is formed on CCD 49 via low-pass filter F that has implemented wave band restriction coating and glass cover by photographic optical system 41 formed object pictures.The object picture that is received by this CCD 49 is presented on the LCD monitor 47 of being located at the camera back side as electronic image by processing unit 51.And, on this processing unit 51, be connected with record cell 52, also can write down captured electronic image.In addition, this record cell 52 can with processing unit 51 split settings, also can constitute and utilize floppy disk or storage card, MO etc. to carry out electronic type record to write.And, also can replace CCD 49 and constitute the silver halide photography machine that has disposed silver film.

And, dispose view finder on light path 44 with objective lens optical system 53 at view finder.View finder is made of a plurality of lens combination (among the figure being 3 groups) and erecting prism system 55 with objective lens optical system 53, this erecting prism system 55 is made of erecting

prism

55a, 55b, 55c, and view finder is made of the varifocal optical system that changes focal length with the interlock of the zoom lens of photographic optical system 41 with objective lens optical system 53, looks like to be formed on the field frame 57 as the erecting prism system 55 of erect image parts with objective lens optical system 53 formed objects by this view finder.Dispose the eyepiece optical system 59 that the picture that will form erect image is directed to observer's eyeball E at the rear of this erecting prism system 55.In addition, the emitting side at eyepiece optical system 59 disposes cover 50.

Figure 23 is the structured flowchart of internal circuit of the major part of above-mentioned digital camera 40.In addition, in the following description, above-mentioned processing unit 51 for example is made of with storer 17, image processing part 18 etc. CDS/ADC portion 24, interim storage, and storage unit 52 for example is made of storage medium portion 19 grades.

As shown in figure 23, digital camera 40 has: operating portion 12, the control part 13 that is connected with this operating portion 12, by

bus

14 and 15 shooting driving circuits that are connected with the control signal output ends mouth of this control part 13 16 and interim storage storer 17, image processing part 18, storage medium portion 19, display part 20, and set information storage storage part 21.

Above-mentioned interim storage constitutes and can carry out inputing or outputing of data mutually by bus 22 with storage part 21 with storer 17, image processing part 18, storage medium portion 19, display part 20 and set information storage, and shooting driving circuit 16 is connected with CCD 49 and CDS/ADC portion 24.

Operating portion 12 has various load buttons and switch, is to be notified to the circuit of control part by the event information of these load buttons and switch input from outside (camera user).

Control part 13 for example is the central arithmetic processing apparatus that is made of CPU etc., and built-in not shown program storage, and control part 13 is according to the program that is stored in this program storage, receives the circuit of controlling digital camera 40 integral body via operating portion 12 from the indicator of camera user input.

CCD 49 receives via photographic optical system 41 formed object pictures of the present invention.CCD49 carries out drive controlling by shooting driving circuit 16, the light quantity of each pixel of this object picture is converted to electric signal and output to the imaging apparatus of CDS/ADC portion 24.

Analog/digital conversion is amplified and carried out in CDS/ADC portion 24 with the electric signal from CCD 49 inputs, and the image raw data (Bayer data is hereinafter referred to as the RAW data) that will only carry out after this amplification and the digital conversion outputs to the circuit of interim storage with storer 17.

Interim storage for example is the buffer that is made of SDRAM etc. with storer 17, is the above-mentioned RAW memory of data device that interim storage is exported from CDS/ADC portion 24.Image processing part 18 is to read to be stored in interim storage with the RAW data in the storer 17 or be stored in RAW data in the storage medium portion 19, and according to comprising the circuit of distortion aberration correction in interior various Flame Image Process from control part 13 specified image quality parameters in the electronics mode.

The cassette that is made of flash memory etc. or the recording medium of bar type for example can be freely installed with plugging by storage medium portion 19, are records and preserving from interim storage with the RAW data of storer 17 transmission with carried out the control circuit of the device of the view data after the Flame Image Process image processing part 18 in these cassettes or bar type flash memory.

Display part 20 has LCD monitor 47, is the circuit of display image and actions menu etc. on this LCD monitor 47.Be provided with ROM portion and RAM portion in set information is stored with storage part 21, this ROM portion stores various image quality parameters in advance, and this RAM portion stores by the input operation of operating portion 12 from read the image quality parameter of selecting from the image quality parameter of this ROM portion.The set information storage is control circuit to the input and output of these storeies with storage part 21.

In the digital camera 40 that constitutes like this, according to the present invention, photographic optical system 41 has sufficient wide-angle zone, can form compact structure, and the imaging performance when high zoom in whole zoom area is extremely stable, thereby can realize high-performance, miniaturization, wide-angleization.And, can realize the wide-angle side, the rapid focus of the side of looking in the distance action.

The present invention not only can be applied to the so-called small-sized digital camera of above such general subject of shooting, and need can be applied to the monitoring camera of Wide-angle, lens to change the formula camera.

Claims

1. zoom lens, this zoom lens from object side to having successively as side:

The 1st lens combination with positive light coke;

The 2nd lens combination with negative power;

The 3rd lens combination with positive light coke; And

The 4th lens combination with positive light coke,

Described zoom lens also has the brightness diaphragm, and this brightness diaphragm is compared with described the 2nd lens combination to be configured in to compare as side and with the most close lens face as side in described the 3rd lens combination and is configured in object side,

From wide-angle side during to the telescope end zoom,

It is big that interval between described the 1st lens combination and described the 2nd lens combination becomes,

Interval between described the 2nd lens combination and described the 3rd lens combination dwindles,

Interval between described the 3rd lens combination and described the 4th lens combination changes,

Described the 1st lens combination has positive lens and negative lens,

Lens sum in described the 1st lens combination is 2,

Described the 2nd lens combination constitutes by organizing after group and the 2nd lens combination of positive light coke before the 2nd lens combination of negative power successively from object side,

Described the 3rd lens combination constitutes by organizing after group and the 3rd lens combination of negative power before the 3rd lens combination of positive light coke successively from object side,

Described the 4th lens combination has the positive lens composition,

Lens composition sum in described the 4th lens combination is 1,

Group has the negative lens composition before described the 2nd lens combination,

Lens composition sum before described the 2nd lens combination in the group is 1,

After described the 2nd lens combination group from object side to having negative lens and positive lens successively as side,

Lens sum after described the 2nd lens combination in the group is 2,

Described negative lens after described negative lens composition before described the 2nd lens combination in the group and described the 2nd lens combination in the group formula (1A) that meets the following conditions:

2.9＜f _2GN2/f _2GN1＜30 (1A)

Wherein, f _2GN1Be the focal length of the described negative lens composition in the group before described the 2nd lens combination,

f _2GN2It is the focal length of the described negative lens in the group after described the 2nd lens combination.

2. zoom lens according to claim 1, in wide-angle side, described the 1st lens combination and described the 2nd lens combination meet the following conditions formula (2A) and conditional (3A):

-1.8＜fnw/fw＜-0.5 (2A)

5＜fp/fw＜500 (3A)

Wherein, fnw is the focal length of described the 1st lens combination and the preceding synthesis system of organizing of described the 2nd lens combination of wide-angle side,

Fp is the focal length of organizing after described the 2nd lens combination,

Fw is the total system focal length of the zoom lens of wide-angle side.

3. zoom lens according to claim 1, the described negative lens formula (4A) that meets the following conditions after described the 2nd lens combination in the group:

2.38＜f _2GN2/f _2G＜30 (4A)

Wherein, f _2GIt is the focal length of described the 2nd lens combination.

4. zoom lens according to claim 1, the negative lens composition before described the 2nd lens combination in the group formula (5A) that meets the following conditions:

-1.23＜f _2GN1/fw＜-0.1 (5A)

5. zoom lens according to claim 1, the described positive lens formula (6A) that meets the following conditions after described the 2nd lens combination in the group:

-5＜f _2GP/f _2G＜-0.2 (6A)

Wherein, f _2GPBe the focal length of the described positive lens in the group after described the 2nd lens combination,

f _2GIt is the focal length of described the 2nd lens combination.

6. zoom lens according to claim 1, described the 1st lens combination has described negative lens and described positive lens successively from object side,

Described negative lens in described the 1st lens combination has the picture side, the absolute value that this has the paraxial curvature bigger than the absolute value of the paraxial curvature of object side as the side,

Described positive lens in described the 1st lens combination has the object side, and this object side mask has the absolute value of the paraxial curvature bigger than the absolute value of the paraxial curvature of picture side.

7. the described negative lens composition before the zoom lens according to claim 1, described the 2nd lens combination in the group is the meniscus shape of convex surface towards object side,

Described negative lens after described the 2nd lens combination in the group is the concave-concave shape and has aspheric surface.

8. the described negative lens composition before the zoom lens according to claim 1, described the 2nd lens combination in the group is a simple lens.

9. the shape that the described negative lens composition before the zoom lens according to claim 1, described the 2nd lens combination in the group is the formula of meeting the following conditions (7A):

0.8＜(R _2GN1f+R _2GN1r)/(R _2GN1f-R _2GN1r)＜1.5 (7A)

10. zoom lens according to claim 1, the described negative lens after described the 2nd lens combination in the group is the double-concave negative lens of the formula of meeting the following conditions (12A):

-0.8＜(R _2GN2f+R _2GN2r)/(R _2GN2f-R _2GN2r)＜0.9 (12A)

11. zoom lens according to claim 1, described negative lens and described positive lens after described the 2nd lens combination in the group are respectively simple lenses,

Described negative lens be concave surface as the side,

The object side of described positive lens is the convex surface with paraxial radius-of-curvature littler than the paraxial radius-of-curvature of the described picture side of described negative lens.

12. group has the positive lens composition before the zoom lens according to claim 1, described the 3rd lens combination,

Lens composition sum before described the 3rd lens combination in the group is 1,

Group has the negative lens composition after described the 3rd lens combination,

Lens composition sum after described the 3rd lens combination in the group is 1.

13. zoom lens according to claim 1, group is a convex surface towards object side and the concave surface negative lens composition towards the meniscus shape of picture side after described the 3rd lens combination, and the formula that meets the following conditions (8A):

-0.6＜(R _3GNf-R _3GNr)/(R _3GNf+R _3GNr)＜0.8 (8A)

14. zoom lens according to claim 1, described the 3rd lens combination has the negative lens of the formula of meeting the following conditions (9A):

15＜v3n＜35 (9A)

The formula (10A) 15. zoom lens according to claim 1, described the 3rd lens combination meet the following conditions:

10＜V3p _ave-v3n _ave＜70 (10A)

The formula (11A) 16. zoom lens according to claim 1, this zoom lens meet the following conditions:

4＜ft/fw (11A)

Ft is the focal length of the zoom lens total system of telescope end.

17. a camera head, this camera head has:

Zoom lens; And

Imaging apparatus, it has the shooting face of the picture side that is configured in this zoom lens, and will convert electric signal to by the optical image on the formed described shooting face of described zoom lens,

Described zoom lens is the described zoom lens of claim 1.

18. camera head according to claim 17, this camera head has signal processing circuit, and this signal processing circuit is processed taking acquired image data by described imaging apparatus, and it is exported as having changed the view data after the shape,

Carried out under the state of focusing the formula that meets the following conditions (13A) at described zoom lens in wide-angle side and maximum distance:

0.7＜y ₀₇/(fw·tanω _07w)＜1.0 (13A)

When the distance in the effective camera watch region at imaging apparatus, from the center to the solstics is made as y ₁₀The time, be defined as:

y _07x＝0.7×y ₁₀

Be changed to from wide-angle side under the situation of telescope end at effective camera watch region,

y ₁₀Be the maximal value of energy value,