CN201383030Y - Camera lens and camera device using same - Google Patents
Camera lens and camera device using same Download PDFInfo
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- CN201383030Y CN201383030Y CN200920005848U CN200920005848U CN201383030Y CN 201383030 Y CN201383030 Y CN 201383030Y CN 200920005848 U CN200920005848 U CN 200920005848U CN 200920005848 U CN200920005848 U CN 200920005848U CN 201383030 Y CN201383030 Y CN 201383030Y
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Abstract
The utility model provides a camera lens and a camera device using same, the camera lens can improve environmental resistance without reducing lens performance or increasing manufacturing cost thereof. The camera lens is sequentially provided, from object side, with: a front group (G1) with negative optical power, a diaphragm (St) and a rear group (G2) with positive optical power; the front group (G1) is sequentially provided, from the object side, with a negative meniscal first lens (L1) the concave of which faces toward image side, a negative second lens (L2) in which absolute value of curvature radius of the lens face at the object side is larger than that of curvature radius of the lens face at the image side, and a positive third lens (L3); and the rear group is sequentially provided, from the object side, with a positive fourth lens (L4), a negative meniscal fifth lens (L5) the concave of which faces toward the object side, and a positive sixth lens (L6). The Abbe numbers of the first lens (L1), the second lens (L2), the fourth lens (L4) and the sixth lens (L6) at d line are more than 40; the Abbe numbers of the third lens (L3) and the fifth lens (L5) at d line are less than 40; and the lenses constituting the front group (G1) and the rear group (G2) are all single-lenses.
Description
Technical field
The utility model relates to the imaging lens system of taking subject and the camera head that utilizes this imaging lens system.
Background technology
Small-sized imaging lens system from the camera head that becomes known for vehicle mounted video camera or surveillance camera etc. in the past.Also become known for the imaging apparatus that constitutes by the CCD of small-sized and high pixel or CMOS etc. of this camera head or with the small-sized imaging lens system of this imaging apparatus combination etc.
And, as the known imaging lens system that utilizes patent documentation 1,2,3,4,5 records of cemented lens realization miniaturization of the imaging lens system that is used for this camera head.
The imaging lens system of patent documentation 1 record is that the F number is 2.0 bright lens, morely surpasses the lens that 1.9 material constitutes by refractive index but be to use, so cost can uprise.The imaging lens system that patent documentation 2 and patent documentation 4 are put down in writing is the lens that utilize non-spherical lens to constitute.When for example vehicle-mounted vidicon uses with lens with lens or surveillance camera, when in lens, using plastics, follow the performance change of temperature to increase this imaging lens system.In addition, when the glass mold pressing was used in lens, cost can increase.The imaging lens system of patent documentation 3 records is that the F number is 2.8 to 4.0 lens, and is just dark excessively as vehicle mounted video camera or surveillance camera.In addition, the lens of putting down in writing from patent documentation 1 to 4 all possess cemented lens, leave some room for improvement aspect environmental resistance.
The lens of patent documentation 5 record use more aspheric surface, and with the one side in the lens as the diffraction optics face, so follow the performance change of temperature to increase when in lens, using plastics.Cost uprises when in addition, using the glass mold pressing in the lens.
Patent documentation 1: United States Patent (USP) 7023628B1 instructions
Patent documentation 2: No. the 2599312nd, Japanese patent gazette
Patent documentation 3: Jap.P. discloses clear 61-123810 communique
Patent documentation 4: the open 2007-279632 communique of Jap.P.
Patent documentation 5: the open 2007-139985 communique of Jap.P.
But, this conduct is applicable to the imaging lens system of vehicle mounted video camera or surveillance camera, require in the car of the automobile for example under the equator in summer, utilize or the cold local open air performance also operable, that follow temperature variation in winter reduces less and against weather is good, bright (the F number is little) small-sized and lens at a low price.
But, utilize the imaging lens system of cemented lens owing to form the environment rotten or distortion of following time that the jointing material of bonding coat continues to place strictness for a long time, the problem of the optical property that reduces imaging lens system is arranged.
And, to consider that also cemented lens is anti-under the environment of strictness to apply special processing in use in order making, but to produce the problem that cost raises.
The problems referred to above are not limited to vehicle mounted video camera or surveillance camera, are the general problems that produces when using the imaging lens system that utilizes cemented lens under the environment of strictness.
The utility model content
The utility model is In view of the foregoing made, and its purpose is, need not reduce lens performance or increase the camera head that cost of manufacture just can improve the imaging lens system of environmental resistance and utilize this imaging lens system.
The 1st imaging lens system of the present utility model is characterized in that, possesses with negative focal power preceding group, diaphragm successively, has back group of positive focal power from the thing side; Before group possess successively concave surface towards the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of picture side, thing side greater than the 2nd negative lens of picture side, the 3rd positive lens from the thing side; Back group from the thing side possess the 4th positive lens successively, with concave surface towards the 5th negative lens that are meniscus shape of thing side, and the 6th positive lens; The 1st lens, the 2nd lens, the 4th lens, and the 6th lens respectively the Abbe number average of d line is made as more than 40; The 3rd lens and the 5th lens are made as below 40 the Abbe number average of d line respectively; The lens of group and back group all are made as simple lens before constituting.
The 2nd imaging lens system of the present utility model is characterized in that, possesses with negative focal power preceding group, diaphragm successively, has back group of positive focal power from the thing side; Before group from the thing side possess successively with concave surface towards as the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of side, thing side greater than as side and be the 2nd negative lens of meniscus shape, the 3rd positive lens; The back group possesses 2 positive lens and 1 negative lens; The 1st lens and the 2nd lens are more than 45 the Abbe number of d line, and the 3rd lens are below 25 to the Abbe number of d line; The negative lens of group are below 25 to the Abbe number of d line after constituting, and positive lens are made as more than 45 the Abbe number average of d line; The lens of group and back group all are made as simple lens before constituting; Distance from the lens face of the thing side of the 1st lens to the imaging surface of imaging lens system is below the 18mm.
The absolute value of the radius-of-curvature of the lens face that preferred above-mentioned the 3rd lens are thing sides is less than the lens that are the biconvex shape as side.
The preferred above-mentioned 2 positive lens that constitute above-mentioned back group all are the biconvex shape.
Preferred above-mentioned the 2nd lens are towards the absolute value of the radius-of-curvature of the lens face of the lens that are the plano-concave shape of thing side or the thing side meniscus shaped lens greater than the picture side with the plane.
The preferred above-mentioned imaging lens system formula (1) that satisfies condition: 0.5＜R10/R9＜1.0.Wherein, R9 is the radius-of-curvature of the lens face of the picture side of lens in the lens that constitute the back group, that be positioned at the most close thing side, and, R10 in the lens that constitute the back group, with the radius-of-curvature of the lens face of the thing side of the picture side adjacent lenses of the lens that are positioned at the most close thing side.
The preferred above-mentioned imaging lens system formula (2) that satisfies condition: 0.8＜| f12/f|＜1.5.Wherein, f is the focal length of whole lens combination, and f12 is the synthetic focal length of the 1st lens and the 2nd lens.
The preferred above-mentioned imaging lens system formula (3) that satisfies condition: 1.0＜| f123/f456|＜2.2.Wherein, f123 is preceding group a synthetic focal length, and f456 is the synthetic focal length of back group.
The preferred above-mentioned imaging lens system formula (4) that satisfies condition: 5＜L/f＜13.Wherein, f is the focal length of whole lens combination, and L is the distance from the lens face of the thing side of the 1st lens to the imaging surface of imaging lens system.
And in the calculating of L value, the lens face that is positioned at the most close picture side from the lens face that constitutes imaging lens system is a value of utilizing air to convert to the distance (rear cut-off distance) of the imaging surface of this imaging lens system.
The preferred above-mentioned imaging lens system formula (5) that satisfies condition: 0.5＜Bf/f＜3.0.Wherein, f is the focal length of whole lens combination, and Bf is a rear cut-off distance.
And, rear cut-off distance is the distance of the lens face that is positioned at the most close picture side to the optical axis of the imaging surface of this imaging lens system from the lens face that constitutes imaging lens system, when having cover glass or various optical filters etc. between imaging lens system and imaging surface, Bf utilizes it is carried out value after air converts.
The preferred above-mentioned imaging lens system formula (6) that satisfies condition: 2.0＜f45/f＜5.2.Wherein, f is the focal length of whole lens combination, and f45 is the synthetic focal length that constitutes in the lens of organizing the back, is positioned at 2 lens adjacent each other of the most close thing side.
Preferably be glass lens from above-mentioned the 1st lens to the 6 lens.
Camera head of the present utility model is characterized in that, possesses: the described imaging lens system of each in the technical scheme 1 to 12; With will be transformed into the imaging apparatus of electric signal by the optical image that this imaging lens system constitutes.
According to the 1st imaging lens system of the present utility model and camera head, possess with negative focal power preceding group, diaphragm successively, have back group of positive focal power from the thing side; Before group possess successively concave surface towards the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of picture side, thing side greater than the 2nd negative lens of picture side, the 3rd positive lens from the thing side; Back group from the thing side possess the 4th positive lens successively, with concave surface towards the 5th negative lens that are meniscus shape of thing side, and the 6th positive lens; The 1st lens, the 2nd lens, the 4th lens, and the 6th lens respectively the Abbe number average of d line is made as more than 40; The 3rd lens and the 5th lens are made as below 40 the Abbe number average of d line respectively; All lens of group and back group all are made as simple lens before constituting, and just can improve environmental resistance so need not reduce lens performance or increase cost of manufacture.
In more detail, according to the 1st imaging lens system of the present utility model and camera head, can obtain following effect.
Promptly, all lens of group before constituting and back group all are made as simple lens, do not use cemented lens, so do not need to implement and the bonding relevant special processing of lens, generation by the bonding undesirable condition that causes of lens also can disappear, and just can improve environmental resistance so need not reduce lens performance or increase cost of manufacture.
In addition, the 1st lens that are disposed at the most close thing side, the 2nd lens of lens combination are made as the lens with negative focal power, thereby make the whole wide-angleization of lens combination easily.The 1st lens are made as the lens of concave surface towards the picture side, the 2nd lens are made as the negative lens of the big side of the absolute value that makes radius-of-curvature towards the thing side, thereby can catch the incident ray that for example comes to surpass freely 130 ° wide field angle.
The 1st lens and the 2nd lens Abbe number to the d line is made as more than 40, thereby while can makes the lens combination wide-angleization suppress the generation of chromatic aberation.
The 3rd lens are made as positive lens, can proofread and correct curvature of the image well.In addition, the Abbe number of the 3rd lens to the d line is made as below 40, can proofreaies and correct the chromatic aberation of multiplying power well.
The 4th lens just are made as, the 5th lens are made as negative lens, the Abbe number of the 4th lens to the d line is made as more than 40, the Abbe number of the 5th lens to the d line is made as below 40, thus chromatic aberation and multiplying power chromatic aberation on the axis calibration well.
The 5th lens are made as the negative meniscus shaped lens of concave surface towards the thing side, can proofread and correct curvature of the image well.
The 6th lens are made as the lens with positive focal power, thereby can reduce the angle that peripheral light incides the imaging surface of imaging lens system, can make the so-called good lens of disposition far away.
According to the 2nd imaging lens system of the present utility model and camera head, possess with negative focal power preceding group, diaphragm successively, have back group of positive focal power from the thing side; With preceding group be made as from the thing side possess successively with concave surface towards as the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of side, thing side greater than as side, the 2nd negative lens that are meniscus shape, the 3rd positive lens; Possess 2 positive lens and 1 negative lens with afterwards organizing to be made as; The 1st lens and the 2nd lens are made as more than 45 the Abbe number average of d line, and the 3rd lens are below 25 to the Abbe number of d line; Above-mentioned 1 negative lens of group are made as below 25 the Abbe number of d line after constituting, and above-mentioned 2 positive lens are made as more than 45 the Abbe number average of d line; All lens of group and back group all are made as simple lens before constituting; Distance from the lens face of the thing side of the 1st lens to the imaging surface of imaging lens system is made as below the 18mm, just can improve environmental resistance so need not reduce lens performance or increase cost of manufacture.
In more detail, according to the 2nd imaging lens system of the present utility model and camera head, can obtain following effect.
Promptly, all lens of group before constituting and back group all are made as simple lens, do not use cemented lens, so do not need to implement and the bonding relevant special processing of lens, generation by the bonding undesirable condition that causes of lens also can disappear, and just can improve environmental resistance so need not reduce lens performance or increase cost of manufacture.In addition, the lens of group before constituting and back group all are made as simple lens, thus the rotten or distortion that physical property and chemical irritation by the composition surface cause can be suppressed, and can improve environmental resistance.
In addition, the 1st lens L1, the 2nd lens L2 are made as the lens with negative focal power, thereby make the whole wide-angleization of lens combination easily.The 1st lens are made as the lens of concave surface towards the picture side, the 2nd lens are made as the negative meniscus shaped lens of the big side of the absolute value that makes radius-of-curvature towards the thing side, thereby can catch the incident ray that for example comes to surpass freely 130 ° wide field angle.
The 3rd lens are made as positive lens, thereby can proofread and correct curvature of the image well.
After diaphragm, dispose 2 positive lenss and 1 negative lens, thereby can proofread and correct curvature of the image and spherical aberration well.
The Abbe number of the lens with negative focal power in preceding group to the d line is made as more than 45, thereby while can makes the lens combination wide-angleization suppress the generation of chromatic aberation.
The Abbe number of the lens with positive focal power in preceding group to the d line is made as below 25, thereby can proofreaies and correct the chromatic aberation of multiplying power well.
The Abbe number of the lens with negative focal power in the back group to the d line is made as below 25, and the lens with negative focal power in will the back group are made as more than 45 the Abbe number of d line, thus chromatic aberation and multiplying power chromatic aberation on the axis calibration well.
Distance from the lens face of the thing side of the 1st lens to imaging surface is made as below the 18mm, thereby can makes lens combination small-sized.
Description of drawings
Fig. 1 is the sectional view of the brief configuration of expression imaging lens system of the present utility model and camera head.
Fig. 2 is the sectional view of brief configuration of the imaging lens system of expression embodiment 1.
Fig. 3 is the sectional view of brief configuration of the imaging lens system of expression embodiment 2.
Fig. 4 is the sectional view of brief configuration of the imaging lens system of expression embodiment 3.
Fig. 5 is the sectional view of brief configuration of the imaging lens system of expression embodiment 4.
Fig. 6 is the sectional view of brief configuration of the imaging lens system of expression embodiment 5.
Fig. 7 is the sectional view of brief configuration of the imaging lens system of expression embodiment 6.
Fig. 8 is the sectional view of brief configuration of the imaging lens system of expression embodiment 7.
Fig. 9 is the sectional view of brief configuration of the imaging lens system of expression embodiment 8.
Figure 10 is the figure of various aberrations of the imaging lens system of expression embodiment 1.
Figure 11 is the figure of various aberrations of the imaging lens system of expression embodiment 2.
Figure 12 is the figure of various aberrations of the imaging lens system of expression embodiment 3.
Figure 13 is the figure of various aberrations of the imaging lens system of expression embodiment 4.
Figure 14 is the figure of various aberrations of the imaging lens system of expression embodiment 5.
Figure 15 is the figure of various aberrations of the imaging lens system of expression embodiment 6.
Figure 16 is the figure of various aberrations of the imaging lens system of expression embodiment 7.
Figure 17 is the figure of various aberrations of the imaging lens system of expression embodiment 8.
Figure 18 be expression load the mobile unit possess camera head of the present utility model the figure of automobile.
Among the figure:
The 10-imaging apparatus, the 20-imaging lens system, the 100-camera head, L1-the 1st lens, L2-the 2nd lens, L3-the 3rd lens, L4-the 4th lens, L5-the 5th lens, L6-the 6th lens, group is organized behind the G2-before the St-aperture diaphragm, G1-.
Embodiment
Below, with reference to accompanying drawing embodiment of the present utility model is described.Fig. 1 represents imaging lens system of the present utility model and utilizes the sectional view of brief configuration of embodiment of the camera head of this imaging lens system.
[about the basic structure of imaging lens system and effect thereof, effect]
At first, 2 kinds of basic structures that imaging lens system 20 is had both are that the 1st basic structure and the 2nd basic structure describe.
(arrow the figure-Z direction side) possesses successively along optical axis Z1 from the thing side to possess the imaging lens system 20 of the 1st following basic structure: have preceding group of G1, the aperture diaphragm St of negative focal power, back group of G2 with positive focal power.
Before group G1 possess successively concave surface towards the absolute value of the radius-of-curvature of the lens face of the 1st negative lens L1 that is meniscus shape of picture side (arrow the figure+Z direction side), thing side negative the 2nd lens L2, the 3rd positive lens L3 from the thing side greater than the picture side.
Back group G2 from the thing side possess the 4th positive lens L4 successively, with concave surface towards the 5th negative lens L5 that is meniscus shape of thing side, and the 6th positive lens L6.
The 1st lens L1, the 2nd lens L2, the 4th lens L4, and the 6th lens L6 respectively the Abbe number of d line is more than 40, the 3rd lens L3 and the 5th lens L5 are below 40 the Abbe number of d line respectively.
The lens of group G1 and back group G2 are simple lens before constituting.
In addition, the imaging lens system 20 that possesses the 2nd following basic structure possesses successively from the thing side: have preceding group of G1, the aperture diaphragm St of negative focal power, back group of G2 with positive focal power.
Before group G1 from the thing side possess successively with concave surface towards as the absolute value of the radius-of-curvature of the lens face of the 1st negative lens L1 that is meniscus shape of side, thing side greater than negative the 2nd lens L2, the 3rd positive lens L3 that is meniscus shape as side.
Back group G2 possesses 2 positive lens and 1 negative lens.
The 1st lens L1 and the 2nd lens L2 are more than 45 the Abbe number of d line, and the 3rd lens L3 is below 25 to the Abbe number of d line; Above-mentioned 1 negative lens of group G2 are below 25 to the Abbe number of d line after constituting, and above-mentioned 2 positive lens are more than 45 the Abbe number of d line.
Distance from the lens face S1 of the thing side of the 1st lens L1 to the imaging surface S16 of imaging lens system 20 is below the 18mm.
At the imaging surface S10 that represents the optical image of subject by these imaging lens system 20 imagings, as the above-mentioned sensitive surface Jk that disposes imaging apparatus 10.
And this imaging lens system 20 can possess the flat optics CG1 of the cover glass etc. of infrared intercepting filter for example or protection sensitive surface Jk between back group G2 and imaging apparatus 10 in the 1st and the 2nd basic structure arbitrarily.The parts that this optics CG1 configuration is selected according to the specification of camera head 100.
And the symbol S1～S16 among Fig. 1 represents following structure.
Symbol S1 and S2 be the 1st lens L1 thing side (arrow among the figure-Z direction side) lens face and the picture side (arrow among the figure+Z direction side) lens face, symbol S3 and S4 represent the 2nd lens L2 the thing side lens face and the picture side lens face, symbol S5 and S6 represent the 3rd lens L3 the thing side lens face and the picture side lens face, S7 represents the aperture portion of aperture diaphragm St, symbol S8 and S9 represent the 4th lens L4 the thing side lens face and the picture side lens face, symbol S10 and S11 represent the 5th lens L5 the thing side lens face and the picture side lens face, symbol S12 and S13 represent the 5th lens L5 the thing side lens face and the picture side lens face, symbol S14 and S15 represent the lens face of thing side of optics CG1 and the lens face of picture side, and symbol S16 represents the imaging surface as the above-mentioned imaging lens system 20 consistent with the sensitive surface Jk of imaging apparatus 10.
Symbol Sk1 represents to be configured in the shadow shield on surface of the picture side of the 1st lens L1, and Sk2 represents to be configured in the shadow shield on surface of the picture side of the 2nd lens L2.And symbol 2 ω represent the full field angle of imaging lens system 20.
And imaging lens system 20 can only satisfy any 1 in the 1st basic structure or the 2nd basic structure.
[structure that the 1st basic structure or the 2nd basic structure are added and effect thereof, effect]
Then, structure that above-mentioned the 1st basic structure that below this imaging lens system 20 is possessed or the 2nd basic structure are added and effect thereof, effect describe.
And, the imaging lens system 20 of present embodiment can only satisfy 1 in a plurality of structures that can be attached to the 1st basic structure or the 2nd basic structure, perhaps, also can satisfy the combination more than 2 in a plurality of structures that are attached to above-mentioned the 1st basic structure or the 2nd basic structure.
And the meaning that is summarised in conditional (1)～(13) each parameter with symbolic representation etc. is in following expression, and above-mentioned conditional represents to be additional in addition the structure of the basic structure of above-mentioned imaging lens system.In addition, also sum up the meaning of parameter about having illustrated etc. in following expression.
F: the focal length of whole lens combination
F12: the synthetic focal length of the 1st lens and the 2nd lens
F123: the synthetic focal length of preceding group of G1
F456: the synthetic focal length of back group G2
F45: the synthetic focal length of 2 lens adjacent each other among the group G2 of back, that be positioned at the most close thing side
R9: the radius-of-curvature of the lens face S9 of the picture side of the 4th lens L4 among the group G2 of back, that be positioned at the most close thing side
R10: the radius-of-curvature of the lens face S10 of the thing side of the 5th lens L5 that the picture side with the 4th lens L4 that is positioned at the most close thing side in the group of back is adjacent
L: distance (rear cut-off distance partly is that air converts) from the lens face S1 of the thing side of the 1st lens L1 to the imaging surface S16 (the sensitive surface Jk of imaging apparatus 10) of imaging lens system
Bf: rear cut-off distance (distance (air characteristic chamber length) that the air from the lens face S13 of the picture side of the 6th lens L6 to imaging surface S16 converts)
Nd1: constitute the refractive index of the material of the 1st lens L1 to the d line
Nd3: be applicable to the refractive index of the material of the 3rd lens L3 to the d line
ED2: the effective diameter of the lens face S2 of the picture side of the 1st lens
IH: maximum image height
V1: be applicable to the Abbe number of the material of the 1st lens L1 to the d line
V2: be applicable to the Abbe number of the material of the 2nd lens L2 to the d line
V3: be applicable to the Abbe number of the material of the 3rd lens L3 to the d line
V4: be applicable to the Abbe number of the material of the 4th lens L4 to the d line
V5: be applicable to the Abbe number of the material of the 5th lens L5 to the d line
V6: be applicable to the Abbe number of the material of the 6th lens L6 to the d line
D1: the thickness on the optical axis of the 1st lens L1 (after, also be called center thickness)
D8: the center thickness of the 4th lens L4
D9: the interval (airspace) of the 4th lens L4 and the 5th lens L5
And f1～f6 represents the 1st lens L1～the 6th lens L6 focal length separately respectively.
Preferred the 3rd lens L3 is a biconvex lens.Be the biconvex shape by the 3rd lens L3, can make the 3rd lens L3 have positive big focal power, it is easy that the correction of the chromatic aberation of curvature of the image and multiplying power becomes.
And preferably the 3rd lens L3 is that the absolute value of radius-of-curvature of lens face S5 of thing side is less than the lens that are the biconvex shape as the absolute value of the radius-of-curvature of the lens face S6 of side.By making the 3rd lens L3 like this, thus easier correction curvature of the image.
2 positive lenss among the preferred back group G2 are biconvex lens.Be made as the lens that are the biconvex shape by 2 lens that the back is organized among the G2, thereby while can guarantee disposition far away correcting colour aberration well with positive focal power.
The lens of the most close thing side that preferably will back group G2, this promptly the 4th lens L4 be made as biconvex lens.Be the biconvex shape by the 4th lens L4 is made as, thereby can make the 4th lens L4 have positive big focal power, so combination that can enough the 5th lens L5 correcting colour aberration well.
The most close lens that preferably will back group G2 as side, this promptly the 6th lens L6 be made as biconvex lens.Be the biconvex shape by the 6th lens L6 is made as, thereby can make the 6th lens L6 have positive big focal power, so can obtain good disposition far away easily.
In addition, the 6th lens L6 is preferably the absolute value of radius-of-curvature of the lens face S12 that makes the thing side less than the biconvex lens of lens face S13 of picture side.By like this, thus correcting spherical aberration well.
The lens face S3 that the 2nd lens L2 is preferably the thing side is the absolute value of radius-of-curvature of lens face S3 of the plano-concave lens on plane or thing side greater than the meniscus shaped lens with negative focal power as the absolute value of the radius-of-curvature of the lens face S4 of side.By the 2nd lens L2 is made as so, thereby can make the 2nd lens L2 have big negative focal power, so help wide-angleization.
The lens of back group G2 from being positioned at the most close thing side be the 2nd lens, this promptly the 5th lens L5 be preferably the meniscus shaped lens of concave surface towards the thing side.By the 5th lens L5 is made as so, thereby can proofread and correct curvature of the image well.
With the lens that are arranged in the most close thing side among the back group G2 as the lens face of side this promptly the lens of the radius of curvature R 9 of the lens face S9 of the 4th lens L4 and back group G2 from being positioned at the most close thing side be the 2nd lens promptly with the lens face of the thing side of above-mentioned the 4th lens L4 adjacent lenses in this i.e. radius of curvature R 10 of the lens face S10 of the 5th lens L5 formula (1) that preferably satisfies condition: 0.5＜R10/R9＜1.0.
But R9 becomes too small if the value of R10/R9 becomes more than the upper limit of conditional (1) then, becomes the edge that is difficult to guarantee the 4th lens; Perhaps R10 becomes excessive, and the focal power of the 5th lens L5 reduces, and is difficult to the correcting colour aberration.In addition, if the value of R10/R9 becomes below the lower limit of conditional (1), then R10 becomes too small, and it is difficult that processing becomes.
Conditional (2): 0.8＜| f12/f|＜1.5th, the formula of relevant wide-angleization and curvature of the image.If lens combination is constituted the formula of satisfying condition (2), wide-angleization when then can suppress the maximization of lens can also suppress curvature of the image.
But,, then be difficult under the state that does not have lens to maximize, reach wide-angleization if the value of f12/f becomes more than the upper limit of conditional (2).In addition,, then realize wide-angleization easily, be difficult to obtain good picture but curvature of the image increases if the value of f12/f becomes below the lower limit of conditional (2).
And, | f12/f| represents the absolute value of the value of f12/f.
Conditional (3): 1.0＜| f123/f456|＜2.2nd, the formula of relevant wide-angleization and curvature of the image.If lens combination is constituted the formula of satisfying condition (3), reach wide-angleization when then can suppress the maximization of lens, can also suppress curvature of the image.
But, if | the value of f123/f456| becomes more than the upper limit of conditional (3), then is difficult to reach wide-angleization under the state that does not have lens to maximize.In addition, if | the value of f123/f456| becomes below the lower limit of conditional (3), then is difficult to proofread and correct well curvature of the image.
Conditional (4): 5＜L/f＜13rd, the size of relevant lens combination and the formula of wide-angleization.If lens combination is constituted the formula of satisfying condition (4), realize wide-angleization when then can suppress the maximization of lens combination.
But if the value of L/f becomes more than the upper limit of conditional (4), then lens combination can maximize.In addition, if the value of L/f becomes below the lower limit of conditional (4), then wide-angleization becomes difficult.
For with the lens combination miniaturization, preferred distance L is below the 22mm.If making distance L is below the 18mm, then more miniaturization, if making distance L is below the 16mm, further miniaturization.
Conditional (5): 0.8＜Bf/f＜3.0th, the formula of the size of relevant rear cut-off distance.If lens combination is constituted the formula of satisfying condition (5), then can suitably set the size of rear cut-off distance.
But if the value of Bf/f becomes more than the upper limit of conditional (5), then rear cut-off distance is excessive, and lens combination can maximize.In addition, if the value of Bf/f becomes below the lower limit of conditional (5), then rear cut-off distance becomes too small, is difficult to insert between lens combination and imaging apparatus cover glass or various optical filter.
In order to insert cover glass or various optical filter between lens combination and imaging apparatus, the value of preferred rear cut-off distance Bf is more than the 2.5mm.
Conditional (6): 2.0＜f45/f＜5.2nd, the formula of relevant chromatic aberation and curvature of the image.If lens combination is constituted the formula of satisfying condition (6), then can well-corrected chromatic aberation and curvature of the image.
But if the value of f45/f becomes more than the upper limit of conditional (6), then the correction of chromatic aberation becomes difficult.In addition, if the value of f45/f becomes below the lower limit of conditional (6), then be difficult to proofread and correct well curvature of the image.
Conditional (7) 0.5＜f1/f2＜2.5th, the formula of relevant coma aberration and distortion.If lens combination is constituted the formula of satisfying condition (7), then can proofread and correct coma aberration and distortion well.
But,, then proofread and correct coma aberration well and become difficult if the value of f1/f2 becomes more than the upper limit of conditional (7).In addition, if the value of f1/f2 becomes below the lower limit of conditional (7), then the radius-of-curvature as the lens face S2 of side of the 1st lens L1 becomes too small, the processing difficulty that becomes, or the focal power of the 1st lens L1 difficulty that becomes excessive and peripheral the light correction of the crooked distortion that is produced sharp and just become.
Conditional (8): 2.0＜f3/f＜4.7th, the formula of relevant curvature of the image and assembleability.If lens combination is constituted the formula of satisfying condition (8), obtain good assembleability when then curvature of the image can be suppressed.
But,, then be difficult to proofread and correct well curvature of the image if the value of f3/f becomes more than the upper limit of conditional (8).In addition, if the value of f3/f becomes below the lower limit of conditional (8), then the focal power of the 3rd lens L3 becomes excessive, and the performance change that is caused by off-centre increases, so the allowance of foozle and assembly error reduces, become the reason that cost rises when being difficult to assemble.
Conditional (9): 2.0＜| f6/f|＜4.5th, about the formula of disposition far away and assembleability.If lens combination is constituted the formula of satisfying condition (9), then can obtain good disposition far away and assembleability.
But, if | the value of f6/f| becomes more than the upper limit of conditional (9), and then Zhou Bian the light angle that incides image planes can become greatly, is difficult to make the far good lens of disposition of what is called.In addition, if | the value of f6/f| becomes below the lower limit of conditional (9), and then the focal power of the 6th lens L6 becomes excessive, and is too responsive to the sensitivity of off-centre, the assembling of the imaging lens system difficulty that becomes.
Conditional (10): 0.40＜D1/f is the formula of the physical strength of relevant the 1st lens L1.If lens combination is constituted the formula of satisfying condition (10), then when for example this imaging lens system is applicable to vehicle-mounted vidicon etc., the resistance to impact that can obtain expecting about the 1st lens L1.
But, if the value of D1/f becomes below the lower limit of conditional (10), then the 1st lens attenuation and be difficult to the resistance to impact that obtains expecting.
Conditional (11): 0.80＜D8/f＜1.80th, the size of relevant lens combination and the formula of assembleability.If lens combination is constituted the formula of satisfying condition (11), then under the state that the size that does not have lens combination maximizes, just can obtain good assembleability.
But if the value of D8/f becomes more than the upper limit of conditional (11), then the lens of the most close thing side of back group are that the 4th lens L4 can maximize at this, are difficult to realize miniaturization.In addition, if the value of D8/f becomes below the lower limit of conditional (11), then the lens of the most close thing side of back group became thin, were difficult to guarantee edge (コ バ), the difficulty so the assembling of imaging lens system becomes.
Conditional (12): 0.10＜D9/f＜1.00th, the formula of the size of relevant lens combination and chromatic aberation and light vignetting.If lens combination is constituted the formula of satisfying condition (12), then can not produce the maximization of lens combination or light vignetting and the correcting colour aberration.
But if the value of D9/f becomes more than the upper limit of conditional (12), then the 4th lens L4 of the most close thing side of back group and increase from the interval of the 5th lens L5 of the 2nd of thing side when lens combination can maximize, is difficult to the correcting colour aberration.In addition, if the value of D9/f becomes below the lower limit of conditional (12), the 4th lens L4 of the most close thing side of back group and become too small then from the interval of the 5th lens L5 of the 2nd of thing side, and the 4th lens are contacted in edge portion with the 5th lens, the chip of lens etc. takes place easily, or produces vignetting at the light from peripheral incident when putting into spaced ring.
Conditional (13): 2.0＜f6/IH＜4.0th, about the formula of disposition far away and assembleability.If lens combination is constituted the formula of satisfying condition (13), then can obtain good disposition far away and assembleability.
But if the value of f6/IH becomes more than the upper limit of conditional (13), then the light from peripheral incident increases to the incident angle of imaging surface, is difficult to make the so-called good lens of disposition far away.In addition, if the value of f6/IH becomes below the lower limit of conditional (13), then the focal power of the 6th lens L6 becomes excessive, and the performance change that is caused by off-centre becomes big, so the allowance of foozle and assembly error reduces, become the reason that cost rises when being difficult to assemble.
All lens of group G1 and back group G2 preferably are glass lens before constituting.Like this, all lens of organizing before constituting and the back is organized are all become glass lens, thereby, also can suppress focal shift using under the situation of lens combination under the environment of strictness.
When the imaging lens system of present embodiment was applicable to the imaging lens system of vehicle-mounted vidicon for example or surveillance camera, this imaging lens system used in wide temperature range, all is glass so preferably constitute the material of lens combination.
The material of preferred formation the 1st lens L1 is more than 1.7 to the refractive index Nd1 of d line.
If establish refractive index Nd1 less than 1.7 o'clock, have big focal power in order to make the 1st lens L1, the rear surface of deepening the 1st lens L1 is the processing of the concave shape of the lens face S2 difficulty that becomes, and the distortion that the image as periphery reduces can take place.
The lens material of preferred formation the 3rd lens L3 is more than 1.8 to the refractive index Nd3 of d line.
Is more than 1.8 by making the lens material that constitutes the 3rd lens L3 to the refractive index Nd3 of d line, thereby increases the 3rd power of lens easily, and can select the little material of Abbe number as the said lens material, so help the correction of the chromatic aberation of multiplying power.In addition, guarantee the edge of the 3rd lens easily.
The lens material that preferably is applicable to the 3rd lens L3 is below 40 to the Abbe number v3 of d line.
Is below 40 by making the lens material that is applicable to the 3rd lens L3 to the Abbe number v3 of d line, thereby can proofread and correct the chromatic aberation of multiplying power well.
Is below 25 by making the lens material that is applicable to the 3rd lens L3 to the Abbe number v3 of d line, thereby can proofread and correct the chromatic aberation of multiplying power more well.
Preferably will constitute back group G2 from the 2nd lens of thing side, this promptly the lens material of the 5th lens L5 be more than 1.8 to the refractive index Nd5 of d line.
The lens material that preferably is applicable to the 1st lens L1 is below 75 to the Abbe number v1 of d line.
If the Abbe number v1 of lens material surpasses 75, then material cost can raise, and being difficult to qurer provides lens combination.
And the Abbe number v1 of the lens material of the 1st lens L1 can be below 70.
The lens material that preferably is applicable to the 2nd lens L2 is below 75 to the Abbe number v2 of d line.
If the Abbe number v2 of this lens material surpasses 75, then material cost can raise, and being difficult to qurer provides lens combination.
And the Abbe number v2 of this lens material can be below 70.
Preferably be applicable to the most close thing side of back group G2 lens, this promptly the lens material of the 4th lens L4 be below 75 to the Abbe number v4 of d line.
If the Abbe number v4 of this lens material surpasses 75, then material cost can raise, and being difficult to qurer provides lens combination.
And the Abbe number v4 of this lens material can be below 70.
Preferably be applicable to back group G2 the most close lens as side, this promptly the lens material of the 6th lens L6 be below 75 to the Abbe number v6 of d line.
If the Abbe number v6 of lens material surpasses 75, then material cost can raise, and being difficult to qurer provides lens combination.
And the Abbe number v6 of this lens material can be below 70.
When imaging lens system 20 for example uses under the environment in the strictness of vehicle mounted video camera etc., the temperature variation that the 1st lens L1 that is configured in the most close thing side preferably uses the anti-anti-surface deterioration that is caused by wind and rain, caused by direct sunlight, and the material of the chemicals of anti-anti-grease, washing agent etc., that is, water tolerance, against weather, acid resistance, the contour material of resistance to chemical reagents.In addition, the 1st lens L1 that is configured in the most close thing side preferably uses hard, non-friable material.
According to more than, preferably utilize glass particularly at the 1st lens L1, perhaps can utilize transparent pottery.Pottery has intensity and is higher than common glass, character that thermotolerance is high.
In addition, the center thickness D1 of the 1st lens L1 is preferably more than the 0.8mm.Be made as more than the 0.8mm by the center thickness D1 that makes the 1st lens L1, thereby can make the 1st lens L1 non-friable.
In addition, as above-mentioned when imaging lens system 20 is applicable to the vehicle mounted video camera, require for example to use to the wide temperature range in the car in tropicopolitan summer in cold local open air.When wide temperature range is used, as the little material of the preferred linear expansion coefficient of the material of lens.Requirement is applicable to vehicle mounted video camera etc., also can preferably all lens be made as glass lens when wide temperature range is used.
In addition, can to the 1st lens apply that waterproof construction interdicts and the external world between air or the discrepancy of moisture, in case change and produce mist in inside by rapid temperature variation, humidity.As waterproof construction can be the 1st lens L1 and the lens frame of accommodating the 1st lens L1 to be carried out bonding as hermetically-sealed construction, also can put into 0 ring as hermetically-sealed construction between the 1st lens L1 and lens frame.
In addition, when lens combination was used under rapid temperature environment, under the humidity environment, the preferred lens system did not use cemented lens (yet claiming to engage lens).Imaging lens system of the present utility model can be that all lens constitute simple lens, becomes the structure of not using cemented lens in total system.
In addition, for imaging lens system at a low price is provided, preferably all lens are spherical lens.Perhaps,, proofread and correct each aberration more well, can use non-spherical lens for situation of paying attention to performance etc.And,, can use plastics as lens material for precision forms aspheric surface well and with low cost.
And, become parasitic light by the outer light beam of the effective diameter between each lens and arrive imaging surface, ghost image might take place.Therefore, as required, the preferred chopping mechanism that covers this parasitic light that is provided with.Can be for example apply opaque coating or opaque sheet material (shadow shield Sk1, Sk2 for example shown in Figure 1) is set as this chopping mechanism in the part as outside the effective diameter of side of lens.Perhaps, opaque sheet material can be set as chopping mechanism in the light path of the light beam that becomes parasitic light.Perhaps, in the such mechanism of cover that the blocking parasitic light more is set by the thing side of the lens of the most close thing side.As an example, shown in Figure 1ly as the lens face S4 of side the example of chopping mechanism Sk1, Sk2 is set respectively as the lens face S2 of side and the 2nd lens L2 at the 1st lens L1, but the position that chopping mechanism is set is not limited to position shown in Figure 1, also can be between other lens or the lens.
In addition, between each lens, can dispose the diaphragm of blocking marginal ray.Marginal ray is the light of the interior periphery of the entrance pupil of outer light of spindle and scioptics system.Interdict marginal ray by the mode that goes up scope out of question than practicality with peripheral light amount, thereby can improve the picture quality of the periphery of imaging surface S16.The blocking of the light of ghost image promptly takes place in the blocking of this marginal ray in addition, can make ghost image not obvious.
[specific embodiment]
Then, with reference to Fig. 2～Figure 17 and table 1～table 9, about the summary descriptions such as numeric data of each imaging lens system of embodiment 1～embodiment 8.And Fig. 2～Fig. 9 is the sectional view of the imaging lens system brief configuration separately of expression embodiment 1～embodiment 8, and the symbolic representation among Fig. 2～Fig. 9 consistent with the symbol among Fig. 1 is corresponding structure mutually.
In addition, table 1～table 9 shown below is tables of the imaging lens system master data separately of expression embodiment 1～embodiment 8.
At left part (with symbol in scheming (a) expression) the expression lens data of table 1～table 8, in right part (with symbol in scheming (b) expression) the concise and to the point specification of expression imaging lens system.
In the lens data of the left part in table 1～table 8, with the face number of the optics of lens etc. as along with from the thing side towards the i that increases successively as side (i=1,2,3 ...) the face number represent.And, in these lens datas, also comprise record aperture diaphragm St face number (i=7), and planopaallel plate be the face number (i=14,15) of the face of the face of thing side of optics Cg1 and picture side, the face number (i=16) of imaging surface etc.
Ri represent i (i=1,2,3 ...) radius-of-curvature of face, Di (i=1,2,3 ...) face interval on the optical axis Z1 of expression i face and i+1 face.And, the symbol Ri of the expression radius-of-curvature of lens data corresponding to the symbol Si of the lens face in the presentation graphs 1 (i=1,2,3 ...).
In addition, in each lens data, Ndj represent along with from the thing side towards the j that increases successively as side (j=1,2,3 ...) optical parameter is to the refractive index of d line (wavelength 587.6nm), vdj represents the Abbe number of j optical parameter to the d line.
In addition, radius-of-curvature and face unit at interval is mm, and radius-of-curvature is to be that protruding situation just is made as to the thing side, will be to being made as negative as the protruding situation of side.
Each value in the concise and to the point specification of the right part in table 1～table 8 below the expression.
Distance that respectively will be from the lens face of the thing side of the 1st lens L1 to imaging surface: the focal length of L (the air), back focal length: Bf (in the air), whole lens combination (the synthetic focal lengths of the 1st lens～the 6th lens): the value of the focal length of the focal length of the focal length of the focal length of the focal length of the focal length of f, the 1st lens: f1, the 2nd lens: f2, the 3rd lens: f3, the 4th lens: f4, the 5th lens: f5, the 6th lens: f6 is represented as concise and to the point specification.And respectively with the synthetic focal length of the 1st lens and the 2nd lens: the synthetic focal length of f12, the 4th lens and the 5th lens: f45, preceding group focal length: the focal length of f123, back group: the value of f456, maximum image height: IH is represented as concise and to the point specification.
And the following left part in table 1～table 9 will be represented each aspheric surface Ri (i=3,4 ...) each COEFFICIENT K, A3, A4, the A5 of aspheric surface formula ... value represent as concise and to the point specification.
Table 9 is tables of value of representing each parameter of conditional (1)～(13) by each embodiment of 1～8.
[table 1]
(a) (b)
[table 2]
(a) (b)
[table 3]
(a) (b)
[table 4]
(a) (b)
[table 5]
(a) (b)
[table 6]
Embodiment 6
(a) (b)
[table 7]
Embodiment 7
(a) (b)
[table 8]
Embodiment 8
(a) (b)
[table 9]
| MAX | 0.88 | 1.35 | 1.93 | 11.25 | 2.13 | 4.79 | 2.01 | 4.15 | 3.76 | 0.90 | 1.32 | 0.21 | 3.40 |
| MIN | 0.79 | 1.02 | 1.31 | 7.19 | 1.24 | 2.62 | 0.82 | 2.52 | 3.07 | 0.42 | 1.03 | 0.14 | 2.74 |
| The upper limit | 1.00 | 1.50 | 2.20 | 13.00 | 3.00 | 5.20 | 2.50 | 4.70 | 4.50 | - | 1.80 | 1.00 | 4.00 |
| Lower limit | 0.50 | 0.80 | 1.00 | 5.00 | 0.80 | 2.00 | 0.50 | 2.00 | 2.00 | 0.40 | 0.80 | 0.10 | 2.00 |
Figure 10～17th, the figure of the various aberrations of each imaging lens system of expression embodiment 1～embodiment 8.
Figure 10～Figure 17 represents the aberration of each imaging lens system of each embodiment to d line (wavelength 587.6nm), F line (wavelength 486.1nm), C line (wavelength 656.3nm) respectively.In addition, 2 dot-and-dash lines are represented sine condition (representing with symbol SNC in the drawings).
And (parameter is handled, and 0≤θ≤ω), desirable image height is made as f * tan θ represents the side-play amount from it for the focal distance f of the usefulness total system of desiring to make money or profit of distortion, angle of half field-of view θ.
In aberration diagram, d line (587.6nm) represents that with solid line F line (486.1nm) is represented by dotted lines, and C line (656.3nm) is represented with 1 dot-and-dash line.
According to the master data of expression embodiment 1～8 and the figure of various aberrations etc. as can be known, according to imaging lens system of the present utility model, the shape by seeking each lens or the optimization of material just can improve environment resistant thereby need not reduce lens performance or increase cost of manufacture.
And the utility model is not limited to above-mentioned embodiment and each embodiment, can carry out various distortion and implement.For example, the value of the radius-of-curvature of each lens composition, face interval and refractive index etc. are not limited to the numerical value shown in above-mentioned each figure, can get other value.
Figure 18 is that an example of loading camera head of the present utility model is the figure of the automobile of vehicle-mounted vidicon, and this camera head possesses imaging lens system of the present utility model and receives to be used to form by this imaging lens system and is imaged on the light of the optical image on the sensitive surface and is transformed into the imaging apparatus of electric signal output.
As shown in figure 18, the mobile unit 502～504 that possesses camera head of the present utility model can be equipped on automobile 501 uses such as grade.Mobile unit 502 is the outer video cameras of car of dead range that are used to take the side of codriver's seat side, and mobile unit 503 is the outer video cameras of car of dead range that are used to take the rear side of automobile 1.In addition, mobile unit 504 is mounted in the back side of introscope, is used to take the interior video camera of car of the field range identical with congratulating the person of sailing.
Claims (13)
1. an imaging lens system is characterized in that, possesses with negative focal power preceding group, diaphragm successively, has back group of positive focal power from the thing side;
Group possesses concave surface towards the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of picture side, thing side greater than the 2nd negative lens of picture side, the 3rd positive lens successively from the thing side before above-mentioned;
Above-mentioned back group from the thing side possess the 4th positive lens successively, with concave surface towards the 5th negative lens that are meniscus shape of thing side, and the 6th positive lens;
Above-mentioned the 1st lens, the 2nd lens, the 4th lens, and the 6th lens respectively the Abbe number of d line is more than 40, above-mentioned the 3rd lens and the 5th lens are below 40 the Abbe number of d line respectively;
The lens that constitute above-mentioned preceding group and back group are simple lens.
2. an imaging lens system is characterized in that, possesses with negative focal power preceding group, diaphragm successively, has back group of positive focal power from the thing side;
Before above-mentioned group from the thing side possess successively with concave surface towards as the absolute value of the radius-of-curvature of the lens face of the 1st negative lens of side, thing side greater than as side and be the 2nd negative lens of meniscus shape, the 3rd positive lens;
Above-mentioned back group possesses 2 positive lens and 1 negative lens;
Above-mentioned the 1st lens and the 2nd lens are more than 45 the Abbe number of d line, and above-mentioned the 3rd lens are below 25 the Abbe number of d line;
The negative lens that constitute above-mentioned back group are below 25 to the Abbe number of d line, and positive lens are more than 45 to the Abbe number of d line;
The lens that constitute above-mentioned preceding group and back group are simple lens;
Distance from the lens face of the thing side of above-mentioned the 1st lens to the imaging surface of imaging lens system is below the 18mm.
3. imaging lens system as claimed in claim 1 or 2 is characterized in that,
The absolute value of the radius-of-curvature of the lens face that above-mentioned the 3rd lens are thing sides is less than the lens that are the biconvex shape as side.
4. imaging lens system as claimed in claim 1 or 2 is characterized in that,
The above-mentioned 2 positive lens that constitute above-mentioned back group all are the biconvex shape.
5. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Above-mentioned the 2nd lens are towards the absolute value of the radius-of-curvature of the lens face of the lens that are the plano-concave shape of thing side or the thing side meniscus shaped lens greater than the picture side with the plane.
6. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (1):
0.5＜R10/R9＜1.0……(1)
Wherein,
R9 is the radius-of-curvature of the lens face of the picture side of lens in the lens that constitute above-mentioned back group, that be positioned at the most close thing side,
R10 in the lens that constitute above-mentioned back group, with the radius-of-curvature of the lens face of the thing side of the picture side adjacent lenses of the lens that are positioned at the most close thing side.
7. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (2):
0.8＜|f12/f|＜1.5……(2)
Wherein,
F is the focal length of whole lens combination,
F12 is the synthetic focal length of the 1st lens and the 2nd lens.
8. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (3):
1.0＜|f123/f456|＜2.2……(3)
Wherein,
F123 is the synthetic focal length of above-mentioned preceding group,
F456 is the synthetic focal length of above-mentioned back group.
9. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (4):
5＜L/f＜13……(4)
Wherein,
F is the focal length of whole lens combination,
L is the distance from the lens face of the thing side of above-mentioned the 1st lens to the imaging surface of above-mentioned imaging lens system.
10. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (5):
0.5＜Bf/f＜3.0……(5)
Wherein,
F is the focal length of whole lens combination,
Bf is a rear cut-off distance.
11. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Satisfy following conditional (6):
2.0＜f45/f＜5.2……(6)
Wherein,
F is the focal length of whole lens combination,
F45 is the synthetic focal length that constitutes in the lens of organizing above-mentioned back, is positioned at 2 lens adjacent each other of the most close thing side.
12. imaging lens system as claimed in claim 1 or 2 is characterized in that,
Be glass lens from above-mentioned the 1st lens to the 6 lens.
13. a camera head is characterized in that possessing:
Aforesaid right requires 1 or 2 described imaging lens systems; With
To be transformed into the imaging apparatus of electric signal by the optical image that this imaging lens system constitutes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008313893 | 2008-12-10 | ||
| JP2008313893 | 2008-12-10 |
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| CN201383030Y true CN201383030Y (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920005848U Expired - Lifetime CN201383030Y (en) | 2008-12-10 | 2009-02-13 | Camera lens and camera device using same |
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| CN (1) | CN201383030Y (en) |
| TW (1) | TWM367338U (en) |
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| CN110023809A (en) * | 2016-11-28 | 2019-07-16 | 柯尼卡美能达株式会社 | Imaging optical system, lens unit and photographic device |
| CN110727088A (en) * | 2019-10-17 | 2020-01-24 | 福建福光股份有限公司 | Wide-angle high-low temperature-resistant fixed-focus lens and working method thereof |
| CN115220186A (en) * | 2022-07-14 | 2022-10-21 | 福建福光天瞳光学有限公司 | Glass-plastic mixed panoramic optical system and imaging method thereof |
| CN115220186B (en) * | 2022-07-14 | 2024-01-12 | 福建福光天瞳光学有限公司 | Glass-plastic mixed look-around optical system and imaging method thereof |
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| TWM367338U (en) | 2009-10-21 |
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