JP3619117B2 - Zoom lens and optical apparatus using the same - Google Patents

Zoom lens and optical apparatus using the same Download PDF

Info

Publication number
JP3619117B2
JP3619117B2 JP2000113182A JP2000113182A JP3619117B2 JP 3619117 B2 JP3619117 B2 JP 3619117B2 JP 2000113182 A JP2000113182 A JP 2000113182A JP 2000113182 A JP2000113182 A JP 2000113182A JP 3619117 B2 JP3619117 B2 JP 3619117B2
Authority
JP
Japan
Prior art keywords
lens
lens group
lt
group
zoom lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2000113182A
Other languages
Japanese (ja)
Other versions
JP2001296476A (en
Inventor
博之 浜野
誠 関田
Original Assignee
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by キヤノン株式会社 filed Critical キヤノン株式会社
Priority to JP2000113182A priority Critical patent/JP3619117B2/en
Priority claimed from US09/650,861 external-priority patent/US6545819B1/en
Priority claimed from US09/678,251 external-priority patent/US6498687B1/en
Publication of JP2001296476A publication Critical patent/JP2001296476A/en
Application granted granted Critical
Publication of JP3619117B2 publication Critical patent/JP3619117B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a zoom lens and an optical apparatus using the same, and in particular, has a total of three lens groups preceded by a lens group having a negative refractive power, and appropriately sets the lens configuration of each of these lens groups. Therefore, the present invention is suitable for a still camera for a film, a video camera, a digital still camera, and the like in which the entire lens system is reduced in size.
[0002]
[Prior art]
Recently, with the enhancement of functions of imaging devices (cameras) such as video cameras and digital still cameras using solid-state imaging devices, a zoom lens with a large aperture ratio that includes a wide angle of view is required for the optical system used therefor. Yes. In this type of camera, various optical members such as a low-pass filter and a color correction filter are arranged between the last lens part and the image sensor, so that the optical system used therefor has a lens system with a relatively long back focus. Required. Furthermore, in the case of a color camera using an image pickup device for color images, in order to avoid color shading, an optical system with good telecentric characteristics on the image side is desired.
[0003]
Conventionally, it consists of two lens groups, a first group having a negative refractive power and a second group having a positive refractive power, and zooming is performed by changing the distance between both lenses. Various so-called short zoom type wide-angle two-group zoom lenses have been proposed. In these short zoom type optical systems, zooming is performed by moving the second group having a positive refractive power, and correction of the image point position accompanying zooming is performed by moving the first group having a negative refractive power. It is carried out.
[0004]
In a lens configuration composed of these two lens groups, the zoom magnification is about twice. Further, in order to collect the entire lens into a compact shape while having a high zoom ratio of 2 times or more, for example, Japanese Patent Publication No. 7-3507 and Japanese Patent Publication No. 6-40170 disclose the image side of a two-group zoom lens. A so-called three-group zoom lens has been proposed in which a third group having a negative or positive refractive power is arranged to correct various aberrations that occur as the magnification increases.
[0005]
Further, in US Pat. No. 4,828,372 and US Pat. No. 5,262,897, the second lens group in the three-group zoom lens is composed of a total of six lenses including two cemented lenses. In addition, higher magnification of 3 times or more is realized.
[0006]
[Problems to be solved by the invention]
A wide-angle three-group zoom lens system that satisfies the back focus and telecentric characteristics has been proposed in, for example, Japanese Patent Laid-Open Nos. 63-135913 and 7-261083. Japanese Patent Laid-Open No. 3-288113 discloses that in a three-group zoom lens, the first group having a negative refractive power is fixed, and the second group having a positive refractive power and the third group having a positive refractive power are moved. An optical system that performs zooming is also disclosed. However, these conventional examples have the disadvantages that the number of components of each lens group is relatively large, the total lens length is long, and the manufacturing cost is high.
[0007]
Further, in recent years, in order to achieve both compactness of the camera and high magnification of the lens system, the distance between the lens groups has been reduced to a different distance from the shooting state during non-shooting, so that the projection amount of the lens system from the camera body has been reduced. A retractable zoom lens is widely used. However, as in the above-described conventional example, the number of components of each lens group is large, and as a result, the length of each lens group on the optical axis becomes long, or the amount of movement in zooming and focusing of each lens group is large. When the total length becomes long, a desired retractable length may not be achieved.
[0008]
Further, in the example described in Japanese Patent Laid-Open No. 7-261083, a convex lens (positive lens) is disposed on the most object side of the first group having a negative refractive power, and the lens outer diameter particularly when the angle is widened. It had the disadvantage that an increase was inevitable. Further, in this example, since the first group having a negative refractive power is moved to perform focusing on a short-distance object, there is a disadvantage that the mechanical structure becomes complicated in combination with the movement by zooming.
[0009]
U.S. Pat. No. 4,999,007 discloses a three-group zoom lens in which the first lens group and the second lens group are each composed of one single lens. However, the overall length of the lens at the wide-angle end is relatively large, and the first group at the wide-angle end is far away from the stop, so that the incident height of off-axis rays is large and the diameter of the lens constituting the first group is increased. As a result, the entire lens system becomes large.
[0010]
In the present invention, in view of the drawbacks of these conventional examples, particularly suitable for a photographing system using a solid-state image sensor, the number of constituent lenses is small, a compact, high zoom ratio that achieves a small diameter, and excellent optical performance. An object of the present invention is to provide a zoom lens and an optical apparatus using the zoom lens.
[0011]
Furthermore, an object of the present invention is to obtain a zoom lens that satisfies at least one of the following matters. That is,
・ Achieving high performance and compactness while increasing the angle of view at the wide-screen end.
-Correct astigmatism and distortion, especially on the wide-angle side.
-While taking the minimum lens configuration, reduce the aberration sharing of the moving lens group, reduce the performance deterioration due to the decentration of the lens groups due to manufacturing errors, etc., and make it easy to manufacture.
Provide good image-side telecentric imaging suitable for an imaging system using a solid-state imaging device while minimizing the number of components.
To shorten the length on the optical axis of each lens group required for the retractable zoom lens and the amount of movement on the optical axis due to zooming and focusing of each lens group.
-Correct distortion well in the entire zoom range as well as at the wide-angle end.
・ Reduce fluctuations caused by zooming of image-side telecentric imaging.
To reduce the amount of movement of the variable power lens group while maintaining telecentric imaging, and achieve further miniaturization.
-Simplify the focusing mechanism for short-distance objects.
Etc.
[0012]
[Means for Solving the Problems]
The zoom lens of the first aspect of the present invention, in order from the object side, and a negative of the first lens group refractive power, a second lens unit of positive refractive power and a third lens unit having positive refractive power, each lens In a zoom lens that performs zooming by changing the distance between groups, the first lens group is composed of two lenses, a negative lens and a positive lens, in order from the object side . When zooming from the wide-angle end to the telephoto end, In the state in which the lens is in focus, the third lens group moves monotonously on the image plane side or with a convex locus on the image plane side, and the amount of movement of the third lens group toward the image plane side at that time Is M3, the focal length of the entire system at the wide-angle end is fw , the focal length of the third lens group is f3, and the focal length of the entire system at the telephoto end is ft. 0.08 <M3 / fw <0.4 ... (1)
1.45 <f3 / ft <2.0 (3)
It is characterized by satisfying the following conditions.
[0013]
According to a second aspect of the present invention, in the first aspect of the invention, when the focal length of the first lens group is f1, and the focal length of the entire system at the telephoto end is ft,
0.7 <| f1 / ft | <1.0 (2) is satisfied.
[0014]
The invention of claim 3 is the invention of claim 1 or 2, wherein the focal length of the second lens group is f2, and the focal length of the entire system at the telephoto end is ft .
0.63 <f2 / ft <0.8 (4)
It is characterized by satisfying the following conditions.
[0015]
A fourth aspect of the invention is characterized in that, in the invention of any one of the first to third aspects, the third lens group is constituted by a positive single lens.
[0016]
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the third lens group includes only a positive single lens composed of a spherical surface, and the radius of curvature of the lens surface on the object side is R3f, When the curvature radius of the lens surface on the image side is R3r, -1.5 <(R3f + R3r) / (R3f-R3r) <-0.5 (5)
It is characterized by satisfying the following conditions.
[0017]
The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the second lens group includes a positive lens having a strong convex surface on the object side compared to the image surface side and a negative lens having a concave surface on the image side. It is characterized by comprising a first cemented lens in which lenses are cemented, and a second cemented lens in which a meniscus negative lens having a convex surface facing the object side and a positive lens are cemented.
[0018]
The invention of claim 7 is characterized in that, in the invention of any one of claims 1 to 6, focusing on a finite distance object is performed by the third lens group.
[0019]
The invention of claim 8 is characterized in that in the invention of any one of claims 1 to 7, the first lens group and the second lens group have at least one aspherical surface.
[0020]
An image pickup apparatus according to a ninth aspect of the invention includes the zoom lens according to any one of the first to eighth aspects, and a solid-state image pickup device that receives an image formed by the zoom lens.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a lens cross-sectional view of Numerical Example 1 described later according to the present invention. 2 to 4 are aberration diagrams at the wide-angle end, middle, and telephoto end of the numerical example of the present invention.
[0025]
FIG. 5 is a lens cross-sectional view of Numerical Example 2 described later according to the present invention. FIGS. 6 to 8 are aberration diagrams at the wide-angle end, in the middle, and at the telephoto end of the numerical example of the present invention.
[0026]
FIG. 9 is a lens cross-sectional view of Numerical Example 3 described later according to the present invention. 10 to 12 are aberration diagrams of the numerical example of the present invention at the wide-angle end, in the middle, and at the telephoto end.
[0027]
FIG. 13 is a lens cross-sectional view of Numerical Example 4 described later according to the present invention. FIGS. 14 to 16 are aberration diagrams at the wide-angle end, in the middle, and at the telephoto end of the numerical example of the present invention.
[0028]
FIG. 17 is a schematic view of the main part of the optical apparatus of the present invention.
[0029]
In the lens cross-sectional view, L1 is a first group (first lens group) having a negative refractive power, L2 is a second group (second lens group) having a positive refractive power, and L3 is a third group (first lens) having a positive refractive power. 3 lens group), SP is an aperture stop, and IP is an image plane. G is a glass block such as a filter or a color separation prism.
[0030]
As shown in the lens cross-sectional view, the zoom lens of the present invention includes, in order from the object side, a first lens unit L1 having a negative refractive power, a second lens unit L2 having a positive refractive power, and a third lens unit having a positive refractive power. The lens unit L3 has three lens units. When zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves back and forth convexly on the image side as indicated by an arrow, and the second lens unit L2 is an object. The third lens unit L3 is moved to the image side.
[0031]
The zoom lens of the present invention has the above configuration as a basic configuration. The zoom lens having high optical performance is achieved by adopting the lens configuration in each of the above-mentioned claims. For example, in the invention of claim 1 based on the basic configuration, the conditional expressions (1) and (3) are satisfied,
It is characterized by.
[0032]
Next, features of the lens configuration of the embodiment of the zoom lens of the present invention will be described.
[0033]
The first lens group is located at the telephoto end at approximately the same or slightly on the image plane side as the wide-angle end, so that the amount of movement of the first lens group when retracted is not too large.
[0034]
The first lens unit is located at the telephoto end and closer to the image side than the wide-angle end, and the aperture stop SP is provided on the object side of the second lens unit L2, and moves on the optical axis integrally with the second lens unit. To do.
[0035]
In the present embodiment, the main zooming is performed by moving the second lens unit having a positive refractive power, the reciprocation of the first lens unit having a negative refractive power, and the image side direction by the third lens unit having a positive refractive power. The movement of the image point due to the zooming is corrected by the movement to.
[0036]
The third lens group having a positive refractive power shares the increase in the refractive power of the photographing lens when the imaging element is used, and the refraction of the short zoom system configured by the first and second lens groups. By reducing the force, it is possible to suppress the occurrence of aberrations in each lens constituting the first lens group and achieve good optical performance. In addition, telecentric imaging on the image side necessary for an optical apparatus using a solid-state imaging device or the like is achieved by giving the third lens group having a positive refractive power the role of a field lens.
[0037]
Further, by placing the stop closest to the object side of the second lens group and reducing the distance between the entrance pupil on the wide angle side and the first lens group, the outer diameter of the lenses constituting the first lens group can be increased, and Good optical performance without increasing the number of constituent lenses by canceling off-axis aberrations between the first lens unit and the third lens unit across a stop arranged on the object side of the second lens unit having a positive refractive power Have gained.
[0038]
Further, in the present embodiment, the first lens unit having a negative refractive power is a meniscus negative lens L11 having a concave surface facing the image side in order from the object side, and a meniscus positive lens L12 having a convex surface facing the object side. A second lens group having a positive refractive power, in order from the object side, includes a positive lens L21 having a convex surface on both lens surfaces, a negative lens L22 having a concave surface on both lens surfaces, and a meniscus having a convex surface facing the object side. Negative lens L23, and positive lens L24 having convex surfaces on both lens surfaces. The lens L21 and the lenses L22 and L23 and the lens L24 are cemented to form two sets of cemented lenses. The third lens group is composed of a positive lens L31 having a strong convex surface facing the object side.
[0039]
Thus, by making each lens group have a lens configuration that achieves both a desired refractive power arrangement and aberration correction, the lens system can be made compact while maintaining good optical performance. The first lens unit having a negative refractive power has a role of focusing the off-axis chief ray on the center of the aperture, and particularly on the wide-angle side, since the amount of refraction of the off-axis chief ray is large, various off-axis aberrations, In particular, astigmatism and distortion are likely to occur. Therefore, in the same way as in a normal wide-angle lens system, a negative-positive configuration that can suppress the increase in the lens diameter closest to the object side is used, and the negative lens surface has a negative refractive power around the image side lens surface of the meniscus negative lens L11. By making the aspherical surface weaker, astigmatism and distortion are corrected in a well-balanced manner, and the first lens group is configured with a small number of lenses, ie, two, contributing to the compactness of the entire lens. .
[0040]
Next, in the second lens group having a positive refractive power, a positive lens L21 having a strong convex surface facing the most object side in the lens group is disposed, and the refraction angle of the off-axis principal ray emitted from the first lens group is reduced. However, the lens shape is such that various off-axis aberrations do not occur. Further, the positive lens L21 is a lens having the highest height of the on-axis light beam, and is a lens mainly involved in correction of spherical aberration and coma aberration. In the present embodiment, spherical aberration and coma aberration are favorably corrected by making the lens surface on the object side of the positive lens L21 an aspherical surface having a positive refractive power that weakens around the lens. Next, the negative lens L22 disposed on the image surface side of the positive lens L21 has a concave surface on the image side, and a negative air lens is formed by the subsequent convex surface on the object side of the negative lens L23 on the image side. The spherical aberration that occurs with the aperture ratio is corrected.
[0041]
Furthermore, in this embodiment, in order to cope with the reduction in the amount of chromatic aberration required with the increase in the number of pixels of a solid-state imaging device such as a CCD and the reduction in the cell pitch, the second lens group is composed of two sets of cemented lenses. The axial chromatic aberration and the lateral chromatic aberration are corrected satisfactorily.
[0042]
In the zoom lens according to the present invention, the third lens group is moved to the image plane side so that the third lens group has a zooming function, and the zooming load on the second lens group is reduced to reduce the load of the second lens group. The amount of movement is reduced, and the overall length of the lens is reduced.
[0043]
Next, the technical meaning of each conditional expression described above and the lens configuration other than the characteristics described above will be described.
[0044]
(A-1) Conditional expression (1) is mainly for reducing the size of the entire lens system.
[0045]
If the amount of movement of the third lens group becomes small beyond the lower limit value of conditional expression (1), the contribution relating to zooming of the third lens group will be reduced, and it will be necessary to move the second lens group by that much. Therefore, miniaturization of the lens system becomes insufficient. Conversely, when the upper limit is exceeded, it becomes difficult to ensure the back focus at the telephoto end.
[0046]
(A-2) Conditional expression (2) mainly corrects various aberrations such as distortion and curvature of field while ensuring sufficient back focus by appropriately setting the refractive power of the first lens unit. To achieve high optics.
[0047]
If the lower limit of conditional expression (2) is exceeded and the focal length of the first lens group is shortened, it becomes difficult to correct distortion during zooming and fluctuations in field curvature. Conversely, when the upper limit is exceeded, it is difficult to ensure the back focus.
[0048]
(A-3) When a short-distance object is photographed using the zoom lens of the present embodiment, good performance can be obtained by moving the first lens group to the object side. It is better to move the lens group to the object side. This prevents an increase in the front lens diameter, an increase in the load on the actuator caused by moving the first lens group with the heaviest lens weight, which occurs when the first lens group arranged closest to the object side is focused. This is because the first lens group and the second lens group can be simply linked by a cam or the like and moved at the time of zooming, and the mechanical structure can be simplified and the accuracy can be improved.
[0049]
(A-4) Conditional expression (3) provides a more telecentric configuration than the two-group configuration of mere negative and positive refractive power by providing a third lens unit having a positive refractive power, and makes the effect sufficient. Is for the purpose.
[0050]
If the lower limit of conditional expression (3) is exceeded and the focal length of the third lens group becomes too short, the combined focal length of the first and second groups will be increased accordingly, so that the entire lens will not be made compact. On the other hand, if the upper limit is exceeded, the exit pupil becomes too short, especially at the wide-angle end, and the amount of movement required for focusing increases when focusing with the third lens group, which is not good.
[0051]
(A-5) Conditional expression (4) is for reducing the amount of movement required for zooming of the second lens group, and achieving miniaturization of the entire optical system.
[0052]
If the lower limit of conditional expression (4) is exceeded and the focal length of the second lens group is shortened, it is advantageous for downsizing the lens system, but the Petzval sum becomes too large in the positive direction, making it difficult to correct field curvature. . On the contrary, if the upper limit is exceeded, the amount of movement of the second lens group necessary for zooming becomes large, and it becomes difficult to achieve miniaturization.
[0053]
(A-6) In the present invention, the second lens group is constituted by two cemented lenses. The advantage is that the refractive power of the concave (negative) lens component in the so-called triplet type is separated into two components, and the triplet. The correction of off-axis flare and the concave lens component that were corrected by increasing the glass thickness of the concave lens component by increasing the degree of freedom in aberration correction compared to the aberration correction method with a single concave lens component such as type It is no longer necessary to perform spherical aberration correction using two negative air lenses provided before and after the lens, and the thickness on the optical axis of the second lens group can be reduced as compared with the triplet type. Contributes to shortening the overall lens length when retracted.
[0054]
(A-7) It is desirable that the third lens group is composed of a single positive lens in terms of size and reduction of the actuator load necessary for focusing.
[0055]
Conditional expression (5) is for performing focusing while setting the lens shape appropriately and reducing aberration variation when the third lens group is a positive single lens and a spherical lens.
[0056]
If the lower limit value of conditional expression (5) is exceeded, ghosts generated on the imaging surface and the object-side lens surface of the third lens unit will tend to form an image near the imaging surface. It is necessary to focus, and it is difficult to reduce the size sufficiently. If the upper limit is exceeded, it becomes difficult to correct spherical aberration and astigmatism during focusing when performing focusing with the third lens group.
[0057]
(A-8) If an aspheric surface having a shape in which the positive refractive power is weakened around the lens is introduced into the third lens group, the variation of astigmatism upon zooming can be further reduced.
It is.
[0058]
As described above, according to the present embodiment, in order from the object side, the three lenses of the first lens group having a negative refractive power, the second lens group having a positive refractive power, and the third lens group having a positive refractive power. An imaging system that uses a solid-state image sensor, in particular, by changing the distance between each lens group, changing the magnification, and appropriately setting the refractive power arrangement, movement amount, group shape, etc. of each lens group Therefore, it is possible to achieve a zoom lens that has a small number of constituent lenses, is compact, and has excellent optical performance in which chromatic aberration is particularly corrected.
[0059]
Further, by effectively introducing an aspheric surface into each lens group, it is possible to effectively correct off-axis aberrations, particularly astigmatism / distortion aberration and spherical aberration when the aperture ratio is increased.
[0060]
Next, an embodiment of a video camera (optical apparatus) using the zoom lens of the present invention as a photographing optical system will be described with reference to FIG.
[0061]
In FIG. 17, 10 is a video camera body, 11 is a photographing optical system constituted by the zoom lens of the present invention, 12 is an image pickup device such as a CCD that receives a subject image by the photographing optical system 11, and 13 is light receiving by the image pickup device 12. A recording means 14 for recording the subject image, and a finder for observing the subject image displayed on a display element (not shown). The display element is constituted by a liquid crystal panel or the like, and a subject image formed on the image sensor 12 is displayed.
[0062]
Thus, by applying the zoom lens of the present invention to an optical apparatus such as a video camera, a small-sized optical apparatus having high optical performance is realized.
[0063]
Next, numerical examples of the present invention will be shown.
[0064]
In each numerical example, Ri is the radius of curvature of the i-th surface in order from the object side, Di is the distance between the i-th surface and the (i + 1) -th surface in order from the object side, and Ni and νi are from the object side, respectively. The refractive index and Abbe number of the i-th optical member in this order.
[0065]
The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive light traveling direction, R is a paraxial radius of curvature, and each aspheric coefficient is K, B, C, D, E. , F,
[0066]
[Expression 1]
[0067]
It is expressed by the following formula. For example, the display of “e-Z” means “10 −Z ”.
[0068]
In the numerical examples, the last two lens surfaces are glass blocks such as face plates and filters. Table 1 shows the relationship between the above-described conditional expressions and numerical values in the numerical examples.
[0069]
[Outside 1]
[0070]
[Outside 2]
[0071]
[Outside 3]
[0072]
[Outside 4]
[0073]
[Table 1]
[0074]
【The invention's effect】
According to the present invention, it is possible to achieve a zoom lens having excellent optical performance with a high zoom ratio that achieves a small diameter with a small number of constituent lenses, and an optical apparatus using the zoom lens.
[Brief description of the drawings]
1 is a lens cross-sectional view of Numerical Example 1 of the present invention. FIG. 2 is an aberration diagram at the wide angle end of Numerical Example 1 of the present invention. FIG. 3 is an intermediate aberration diagram of Numerical Example 1 of the present invention. FIG. 5 is a lens cross-sectional view of Numerical Example 2 of the present invention. FIG. 6 is an aberration diagram of Wide Angle End of Numerical Example 2 of the present invention. FIG. 8 is an aberration diagram at the telephoto end of Numerical Example 2 according to the present invention. FIG. 9 is a sectional view of a lens according to Numerical Example 3 according to the present invention. Fig. 11 is an aberration diagram at the wide-angle end of Numerical Example 3 of the invention. Fig. 11 is an intermediate aberration diagram of Numerical Example 3 of the invention. Fig. 12 is an aberration diagram at the telephoto end of Numerical Example 3 of the invention. FIG. 14 is a lens cross-sectional view of Numerical Example 4 of the present invention. FIG. 14 is an aberration diagram at the wide-angle end of Numerical Example 4 of the present invention. Main part schematic diagram of the optics of the aberration diagrams at the telephoto end according to Numerical Embodiment 4 [17] The present invention EXPLANATION OF REFERENCE NUMERALS
L1 First group L2 Second group L3 Third group SP Aperture IP Image plane d d line g g line S Sagittal image plane M Meridional image plane

Claims (9)

  1. In order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, and zooming is performed by changing the interval between the lens groups. In the zoom lens, the first lens group includes two lenses, a negative lens and a positive lens, in order from the object side. In zooming from the wide-angle end to the telephoto end, the third lens group is in a state in which the object at infinity is in focus. The lens group moves monotonously on the image plane side or with a convex locus on the image plane side. The movement amount of the third lens group to the image plane side at that time is M3, and the focal point of the entire system at the wide-angle end. When the distance is fw, the focal length of the third lens group is f3, and the focal length of the entire system at the telephoto end is ft, 0.08 <M3 / fw <0.4.
    1.45 <f3 / ft <2.0
    A zoom lens that satisfies the following conditions:
  2. When the focal length of the first lens group is f1, and the focal length of the entire system at the telephoto end is ft,
    0.7 <| f1 / ft | <1.0
    The zoom lens according to claim 1, wherein the following condition is satisfied.
  3. When the focal length of the second lens group is f2, and the focal length of the entire system at the telephoto end is ft,
    0.63 <f2 / ft <0.8
    The zoom lens according to claim 1 or 2, wherein the following condition is satisfied.
  4. The zoom lens according to any one of claims 1 to 3, wherein the third lens group is constituted by a positive single lens.
  5. The third lens group is composed of only a single positive spherical lens. When the radius of curvature of the lens surface on the object side is R3f and the radius of curvature of the lens surface on the image side is R3r, -1.5 <(R3f + R3r). ) / (R3f-R3r) <-0.5
    The zoom lens according to claim 1, wherein the following condition is satisfied.
  6. The second lens group includes a first cemented lens in which a positive lens having a strong convex surface facing the object side compared to the image surface side, a negative lens having a concave surface facing the image side, and a meniscus shape having a convex surface facing the object side. 6. The zoom lens according to claim 1, comprising a second cemented lens in which a negative lens and a positive lens are cemented.
  7. The zoom lens according to claim 1, wherein focusing on an object of a finite distance is performed by the third lens group.
  8. The zoom lens according to claim 1, wherein the first lens group and the second lens group have at least one aspheric surface.
  9. An image pickup apparatus comprising: the zoom lens according to claim 1 ; and a solid-state image sensor that receives an image formed by the zoom lens.
JP2000113182A 2000-04-14 2000-04-14 Zoom lens and optical apparatus using the same Expired - Fee Related JP3619117B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000113182A JP3619117B2 (en) 2000-04-14 2000-04-14 Zoom lens and optical apparatus using the same

Applications Claiming Priority (17)

Application Number Priority Date Filing Date Title
JP2000113182A JP3619117B2 (en) 2000-04-14 2000-04-14 Zoom lens and optical apparatus using the same
US09/650,861 US6545819B1 (en) 1999-08-31 2000-08-29 Zoom lens and optical apparatus having the same
EP20000307448 EP1096287B1 (en) 1999-08-31 2000-08-30 Zoom lens of the retrofocus type having three lens groups
KR20000050973A KR100439937B1 (en) 1999-08-31 2000-08-31 Zoon lens and optical apparatus having the same
US09/678,251 US6498687B1 (en) 1999-10-06 2000-10-03 Zoom lens and optical apparatus having the same
EP20000308843 EP1093000B1 (en) 1999-10-06 2000-10-06 Retrofocus-type zoom lens comprising two groups
KR20000058859A KR100397038B1 (en) 1999-10-06 2000-10-06 Zoon lens and optical apparatus having the same
US10/195,364 US6822808B2 (en) 1999-08-31 2002-07-16 Zoom lens and optical apparatus having the same
KR20020069575A KR100508873B1 (en) 1999-08-31 2002-11-11 Zoom lens and optical apparatus having the same
KR1020020069574A KR100796106B1 (en) 1999-08-31 2002-11-11 Zoom lens and optical apparatus having the same
US10/355,176 US6862143B2 (en) 1999-08-31 2003-01-31 Zoom lens and optical apparatus having the same
US10/934,392 US7113347B2 (en) 1999-08-31 2004-09-07 Zoom lens and optical apparatus having the same
US10/935,225 US6999242B2 (en) 1999-08-31 2004-09-08 Zoom lens and optical apparatus having the same
US10/935,112 US7023625B2 (en) 1999-08-31 2004-09-08 Zoom lens and optical apparatus having the same
US11/237,806 US7113348B2 (en) 1999-08-31 2005-09-29 Zoom lens and optical apparatus having the same
US11/427,548 US7450318B2 (en) 1999-08-31 2006-06-29 Zoom lens and optical apparatus having the same
US11/427,546 US7227701B2 (en) 1999-08-31 2006-06-29 Zoom lens and optical apparatus having the same

Publications (2)

Publication Number Publication Date
JP2001296476A JP2001296476A (en) 2001-10-26
JP3619117B2 true JP3619117B2 (en) 2005-02-09

Family

ID=18625201

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000113182A Expired - Fee Related JP3619117B2 (en) 2000-04-14 2000-04-14 Zoom lens and optical apparatus using the same

Country Status (1)

Country Link
JP (1) JP3619117B2 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3943922B2 (en) 2001-12-11 2007-07-11 オリンパス株式会社 Imaging device
WO2003085440A1 (en) 2002-04-11 2003-10-16 Matsushita Electric Industrial Co., Ltd. Zoom lens and electronic still camera using it
JP4354153B2 (en) 2002-06-11 2009-10-28 株式会社リコー Zoom lens, camera, and portable information terminal device
JP4244288B2 (en) 2002-08-29 2009-03-25 フジノン株式会社 3 group zoom lens
US6839185B2 (en) 2002-11-01 2005-01-04 Ricoh Company, Ltd. Compact zoom lens system and digital camera using the compact zoom lens system
JP4497514B2 (en) * 2003-09-11 2010-07-07 フジノン株式会社 Wide angle zoom lens
JP2005084647A (en) 2003-09-11 2005-03-31 Fujinon Corp Zoom lens
JP4371304B2 (en) 2003-09-11 2009-11-25 フジノン株式会社 Wide angle zoom lens
JP4450307B2 (en) 2003-09-11 2010-04-14 フジノン株式会社 3 group zoom lens
US7151638B2 (en) 2004-02-27 2006-12-19 Ricoh Company, Ltd. Zooming lens system and device using the zooming lens system
JP4792395B2 (en) * 2004-06-29 2011-10-12 パナソニック株式会社 Zoom lens system, imaging device and camera
JP4884783B2 (en) 2006-01-19 2012-02-29 富士フイルム株式会社 Imaging magnification changing optical system and imaging apparatus using the same
JP5044356B2 (en) 2007-10-12 2012-10-10 日東光学株式会社 Zoom lens system
JP5141375B2 (en) * 2008-05-26 2013-02-13 ソニー株式会社 Zoom lens and imaging device
CN104995542B (en) 2013-02-19 2017-12-12 株式会社尼康 Optical system, Optical devices and the method for manufacturing optical system
JP6236795B2 (en) * 2013-02-19 2017-11-29 株式会社ニコン Optical system and optical equipment

Also Published As

Publication number Publication date
JP2001296476A (en) 2001-10-26

Similar Documents

Publication Publication Date Title
US10437026B2 (en) Zoom lens system, imaging apparatus, and method for zooming the zoom lens system
US8228617B2 (en) Zoom lens and image pickup apparatus having the same
JP5498259B2 (en) High magnification zoom lens
US6999242B2 (en) Zoom lens and optical apparatus having the same
JP4898200B2 (en) Zoom lens and imaging apparatus having the same
JP4323793B2 (en) Zoom lens and optical apparatus having the same
US6671103B2 (en) Zoom lens and optical apparatus using the same
US6943962B2 (en) Zoom lens system
JP4886346B2 (en) Zoom lens and imaging apparatus having the same
JP4738614B2 (en) Wide angle zoom lens
JP4589231B2 (en) Zoom lens, imaging device, and camera equipped with imaging device
JP4532916B2 (en) Zoom lens and imaging apparatus having the same
JP2816436B2 (en) High-magnification large-aperture zoom optical system
JP3478643B2 (en) Photographing lens and imaging camera using the same
JP4280538B2 (en) Zoom lens
JP5046747B2 (en) Zoom lens and imaging apparatus having the same
JP4669294B2 (en) Zoom lens and imaging apparatus having the same
JP3506691B2 (en) High magnification zoom lens
US6844986B2 (en) Zoom lens and image taking apparatus using the same
JP4738823B2 (en) Zoom lens and imaging apparatus having the same
JP5263589B2 (en) Zoom lens system, optical apparatus equipped with the zoom lens system, and zooming method using the zoom lens system
US7460311B2 (en) Zoom lens system and image pickup apparatus including the same
JP5197242B2 (en) Zoom lens and imaging apparatus having the same
JP3862520B2 (en) Zoom lens and optical apparatus using the same
JP4612823B2 (en) Zoom lens and imaging apparatus having the same

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040302

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040506

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20040608

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040723

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20040928

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20041013

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20041109

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20041111

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20071119

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081119

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081119

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20091119

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101119

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20101119

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111119

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121119

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131119

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees